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8-K

Karyopharm Therapeutics Inc. (KPTI)

8-K 2021-05-03 For: 2021-04-27
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Added on April 12, 2026

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): April 27, 2021

Karyopharm Therapeutics Inc.

(Exact Name of Registrant as Specified in Charter)

Delaware 001-36167 26-3931704
(State or Other Jurisdiction<br> <br>of Incorporation) (Commission<br> <br>File Number) (IRS Employer<br> <br>Identification No.)
85 Wells Avenue, 2nd Floor<br> <br>Newton, Massachusetts 02459
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(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code: (617) 658-0600

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
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Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
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Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
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Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading<br> <br>Symbol(s) Name of each exchange<br> <br>on which registered
Common Stock, $0.0001 par value KPTI Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Appointment of Richard Paulson as President and Chief Executive Officer

On April 27, 2021, the Board of Directors (the “Board”) of Karyopharm Therapeutics Inc. (the “Company”) appointed Richard Paulson as President and Chief Executive Officer of the Company, effective as of May 3, 2021. Mr. Paulson has served as a member of the Board since February 2020 and will remain on the Board as a non-independent director. Mr. Paulson succeeds Michael G. Kauffman, who resigned on April 28, 2021 as the Company’s Chief Executive Officer effective as of May 3, 2021, and Sharon Shacham, who resigned on April 28, 2021 as the Company’s President effective as of May 3, 2021. Dr. Kauffman will continue in his role as a member of the Board and assume a new role with the Company as Senior Clinical Advisor. Dr. Shacham will continue in her roles as the Company’s Chief Scientific Officer and Chair of the Company’s Scientific Advisory Board.

Mr. Paulson, age 53, most recently served as the Executive Vice President of Ipsen Pharmaceuticals, Inc. and Chief Executive Officer of Ipsen North America, a global biopharmaceutical company focused on innovation and specialty care in areas of oncology, neuroscience and rare diseases, from February 2018 to April 2021. Mr. Paulson was Vice President and General Manager, U.S. Oncology Business Unit at Amgen Inc. (“Amgen”), a public biotechnology company, from 2015 to February 2018, and prior to that was Vice President, Marketing for Amgen’s U.S. Oncology Business, General Manager, Amgen Germany and General Manager of Amgen Central & Eastern. Prior to Amgen, Mr. Paulson held a number of global leadership positions at Pfizer Inc., including serving as General Manager of Pfizer South Africa and Pfizer Czech Republic. Mr. Paulson also previously held a variety of sales, marketing, and market access roles with increasing seniority at GlaxoWellcome plc in Canada. Mr. Paulson has an M.B.A. from the University of Toronto, Canada and an undergraduate degree in commerce from the University of Saskatchewan, Canada.

There are no family relationships between Mr. Paulson and any director, executive officer or person nominated or chosen by the Company to become a director or executive officer of the Company. There are no transactions in which Mr. Paulson has an interest requiring disclosure under Item 404(a) of Regulation S-K. Effective as of May 3, 2021, Mr. Paulson will no longer serve as a member of the Audit Committee of the Board (the “Audit Committee”). The Board has appointed Chen Schor to serve on the Audit Committee in place of Mr. Paulson.

In connection with his employment with the Company, pursuant to the terms of an offer letter dated April 28, 2021, (the “Offer Letter”), Mr. Paulson will receive an annual base salary of $670,000 and a $700,000 sign-on bonus payable in three separate payments of $300,000 (“Milestone Payment 1”), $200,000 (“Milestone Payment 2”) and $200,000 (“Milestone Payment 3”) to be paid in the payroll period following May 3, 2021, May 3, 2022 and May 3, 2023 (each, a “Milestone Date”), respectively, contingent on Mr. Paulson’s commencement of employment with the Company (with respect to Milestone Payment 1) and his continued employment through the applicable Milestone Date (with respect to Milestone Payment 2 and Milestone Payment 3). The Offer Letter provides that if Mr. Paulson’s employment is terminated for Cause (as defined in the Offer Letter) or he resigns other than for Good Reason (as defined in the Offer Letter) prior to the one-year anniversary of each applicable Milestone Date or after the one-year anniversary but prior to the two-year anniversary of the applicable Milestone Date, he must repay 100% or 50%, respectively, of the net amount of the applicable Milestone Payment received in connection with such Milestone Date. Mr. Paulson is also eligible for an annual bonus at a target of 65% of his annualized base salary based solely on the Company’s performance during the applicable calendar year. In addition, under the terms of the Offer Letter, Mr. Paulson will also be eligible to participate in all Company benefits available to other employees of the Company.

Pursuant to the terms of the Offer Letter, the Board granted to Mr. Paulson, effective as of May 3, 2021, (i) a stock option to purchase 559,800 shares of the Company’s common stock, $0.0001 par value per share (the “Common Stock”), with an exercise price equal to the closing price of the Common Stock, as reported by the Nasdaq Global Select Market, on May 3, 2021, and (ii) 373,200 restricted stock units (“RSUs”). The stock option will vest as to 25% of the shares underlying the stock option on the first anniversary of the grant date and then monthly thereafter until the fourth anniversary of the grant date. 25% of the total number of RSUs will vest on the one-year anniversary of the grant date and 1/48^th^ of the total number of RSUs will vest monthly thereafter.

The Offer Letter also provides that, if Mr. Paulson’s employment is terminated without Cause or he resigns for Good Reason (other than within one year following the consummation of a Change in Control (as defined in the Offer Letter)), he will be entitled to receive the following severance benefits: (i) salary continuation for 18 months (the “Severance Period”); (ii) a lump sum payment of any unpaid Milestone Payments; (iii) a lump sum, pro-rated target bonus for the year in which the termination occurs; and (iv) an opportunity to enter into a consulting arrangement with the Company during which he will be compensated for services performed and any unvested equity awards granted by the Company will continue to vest. If Mr. Paulson’s employment is terminated without Cause or he resigns for Good Reason within one year following the consummation of a Change in Control, he will, in lieu of the severance benefits described above, be entitled to receive the following severance benefits: (i) salary continuation for the Severance Period; (ii) a lump sum payment of any unpaid Milestone Payments; and (iii) an amount equal to 150% of his target annual bonus for the year in which the termination occurs. In addition, if in connection with the termination of Mr. Paulson’s employment, he elects to continue his and his eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to the Consolidated Omnibus Budget Reconciliation Act of 1986 (“COBRA”), the Company will, as a severance benefit, pay the premiums to continue such coverage for the lesser of (i) the Severance Period and (ii) the end of the calendar month in which he becomes eligible to receive group health plan coverage under another employee benefit plan. Mr. Paulson’s receipt of the severance benefits discussed in this paragraph is subject to Mr. Paulson’s timely execution and non-revocation of a separation and release of claims agreement as described in the Offer Letter.

The foregoing description of the Offer Letter is qualified in its entirety by the full text of the Offer Letter, a copy of which is filed hereto as Exhibit 10.1 and incorporated herein by reference.

Dr. Kauffman’s Amended and Restated Letter Agreement

On April 28, 2021, the Company entered into an amended and restated letter agreement, effective as of May 3, 2021, with Dr. Kauffman (the “Kauffman Agreement”). The Kauffman Agreement amends and restates the amended and restated letter agreement between Dr. Kauffman and the Company, dated as of August 28, 2020 and provides for Dr. Kauffman’s employment as Senior Clinical Advisor. Pursuant to the Kauffman Agreement, Dr. Kauffman will be provided with an annual base salary of $388,125 and an annual bonus target opportunity equal to 50% of his annual base salary based upon the achievement of certain performance goals and corporate milestones. He will also be eligible to receive annual equity grants in the Company’s sole discretion and to participate in medical, retirement and other benefits that are made available to other executive level employees of the Company.

The Kauffman Agreement also provides that, if Dr. Kauffman’s employment is terminated without Cause (as defined in the Kauffman Agreement) or he resigns for Good Reason (as defined in the Kauffman Agreement) on or before May 3, 2023 (other than within the twelve month period following a Change of Control (as defined in the Kauffman Agreement)), he will be entitled to receive severance pay in the form of salary continuation at the rate of $646,875 per annum for the Severance Period. If Dr. Kauffman’s employment is terminated without Cause or he resigns for Good Reason on or before May 3, 2023 and within the twelve month period following a Change of Control, he will, in lieu of the severance benefits described above, be entitled to receive the following severance benefits: (i) salary continuation at the rate of $646,875 per annum for the Severance Period; and (ii) an amount equal to 150% of his target annual bonus for the year in which the termination occurs. In addition, if in connection with the termination of Dr. Kauffman’s employment on or before May 3, 2023, he elects to continue his and his eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to COBRA, the Company will, as a severance benefit, pay the premiums to continue such coverage for the lesser of (i) the Severance Period and (ii) the end of the calendar month in which he becomes eligible to receive group health plan coverage under another employee benefit plan. If Dr. Kauffman’s employment is terminated without Cause or he resigns for Good Reason after May 3, 2023, he will be entitled to severance pay in a lump sum in the amount of $323,500. Dr. Kauffman’s receipt of the severance benefits discussed in this paragraph is subject to Dr. Kauffman’s timely execution and non-revocation of a separation and release of claims agreement as described in the Kauffman Agreement.

Pursuant to the Kauffman Agreement, Dr. Kauffman also surrendered all right, title and interest to portions of certain outstanding stock options for the purchase of 290,000 shares of Common Stock. Dr. Kauffman’s remaining outstanding equity awards will continue to vest, provided that if the Company terminates his employment without Cause or he resigns for Good Reason on or prior to March 1, 2025, then any of the remaining unvested portions of

such equity awards will become vested and exercisable and, if such awards are stock options, will remain exercisable until the earlier of March 1, 2026 and the expiration date of such stock option.

The foregoing description of the Kauffman Agreement is qualified in its entirety by the full text of the Kauffman Agreement, a copy of which is filed hereto as Exhibit 10.2 and incorporated herein by reference.

Dr. Shacham’s Amended and Restated Letter Agreement

On April 28, 2021, the Company entered into an amended and restated letter agreement, effective as of May 3, 2021, with Dr. Shacham (the “Shacham Agreement”). The Shacham Agreement amends and restates the amended and restated letter agreement between Dr. Shacham and the Company, dated as of August 28, 2020 and provides for Dr. Shacham’s continued employment as Chief Scientific Officer, the cessation of Dr. Shacham’s direct management responsibilities beginning on January 1, 2022 (the “Transition Date”) and her continuing service as Chair of the Company’s Scientific Advisory Board through no earlier than January 1, 2024. Pursuant to the Shacham Agreement, Dr. Shacham will be provided with an annual base salary of $499,905 for the remainder of 2021 and $300,000 as of the Transition Date, and an annual bonus target opportunity equal to 50% of her annual base salary based upon the achievement of certain performance goals and corporate milestones. For so long as Dr. Shacham continues to serve as Chief Scientific Officer, she will also be eligible to receive annual equity grants on the same basis as the Company’s other executive officers in good standing as determined by the Board in its sole discretion and to participate in medical, retirement and other benefits that are made available to other executive level employees of the Company.

The Shacham Agreement also provides that, if Dr. Shacham’s employment is terminated without Cause (as defined in the Shacham Agreement) or she resigns for Good Reason (as defined in the Shacham Agreement) on or before January 1, 2024 (other than within the twelve month period following a Change of Control (as defined in the Shacham Agreement)), she will be entitled to receive severance pay in the form of salary continuation at the rate of $499,905 per annum for the Severance Period. If Dr. Shacham’s employment is terminated without Cause or she resigns for Good Reason on or before January 1, 2024 and within the twelve month period following a Change of Control, she will, in lieu of the severance benefits described above, be entitled to the following severance benefits: (i) salary continuation at the rate of $499,905 per annum for the Severance Period; and (ii) an amount equal to 150% of her target annual bonus for the year in which the termination occurs. In addition, if in connection with the termination of Dr. Shacham’s employment on or before January 1, 2024, she elects to continue her and her eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to COBRA, the Company will, as a severance benefit, pay the premiums to continue such coverage for the lesser of (i) the Severance Period and (ii) the end of the calendar month in which she becomes eligible to receive group health plan coverage under another employee benefit plan. If Dr. Shacham’s employment is terminated without Cause or she resigns for Good Reason after January 1, 2024, she will be entitled to severance pay in a lump sum in the amount of $150,000. Dr. Shacham’s receipt of the severance benefits discussed in this paragraph is subject to Dr. Shacham’s timely execution and non-revocation of a separation and release of claims agreement as described in the Shacham Agreement.

Pursuant to the Shacham Agreement, Dr. Shacham also surrendered all right, title and interest to portions of certain outstanding stock options for the purchase of 290,000 shares of Common Stock. Dr. Shacham’s remaining outstanding equity awards will continue to vest, provided that if the Company terminates her employment without Cause or she resigns for Good Reason on or prior to March 1, 2025, then any of the remaining unvested portions of such equity awards will become vested and exercisable and, if such awards are stock options, will remain exercisable until the earlier of March 1, 2026 and the expiration date of such stock option.

The foregoing description of the Shacham Agreement is qualified in its entirety by the full text of the Shacham Agreement, a copy of which is filed hereto as Exhibit 10.3 and incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(d)    Exhibits

Exhibit<br> <br>Number Description of Exhibit
10.1 Offer Letter, dated as of April 28, 2021, between the Company and Richard Paulson
10.2 Amended and Restated Letter Agreement, dated as of April 28, 2021, between the Company and Michael Kauffman, M.D., Ph.D.
10.3 Amended and Restated Letter Agreement, dated as of April 28, 2021, between the Company and Sharon Shacham, Ph.D., M.B.A.
104 Cover Page Interactive Data File (formatted as Inline XBRL)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

KARYOPHARM THERAPEUTICS INC.
Date: May 3, 2021 By: /s/ Michael Mano
Michael Mano
Senior Vice President, General Counsel and Secretary

EX-10.1

Exhibit 10.1

EXECUTION VERSION

LOGO

85 Wells Ave. Newton, MA

April 28, 2021

Richard Paulson

Via Email:

Dear Richard,

I am pleased to present you this offer of employment to serve as the President and Chief Executive Officer (“CEO”) of Karyopharm Therapeutics Inc. (the “Company”). You will report to the Company’s Board of Directors (the “Board”) and will continue to serve as a member of the Board. Your primary place of work shall be out of the Company’s offices in Newton, Massachusetts. We anticipate your start date to be on May 3, 2021. Please review the details of your offer of employment below.

1. Compensation

a. Base Salary. Your semi-monthly base salary will be $27,916.67 ($670,000.00, if annualized) (“Base Salary”), subject to all applicable taxes and withholdings. This position is classified as Exempt according to the Fair Labor Standards Act (FLSA). Beginning in 2022, your base salary will be reviewed annually and may be increased by the Compensation Committee of the Board (the “Compensation Committee”) in connection with any such review.

b. Bonus Program. Following the end of each calendar year, and subject to the approval of the Board (or the Compensation Committee), you will be eligible for a retention and performance bonus at a target of 65% of your annualized base salary (the “Target Bonus”), based solely on the Company’s performance during the applicable calendar year, as determined by the Board (or the Compensation Committee) in its sole discretion in accordance with certain corporate goals determined by the Board (or the Compensation Committee); provided, however, that the Board or Compensation Committee may approve a bonus amount above target if it determines that the Company’s performance substantially exceeds the established goals. In any event, you must be an active employee of the Company on the date the bonus is distributed in order to be eligible for and to earn any bonus award, as it also serves as an incentive to remain employed by the Company. Notwithstanding any criteria to the contrary, your 2021 bonus will not be prorated based on your commencement of employment with the Company after the beginning of the calendar year.

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EXECUTION VERSION

c. Stock Option Grant. Subject to the approval of the Compensation Committee, the Company will grant you a stock option to purchase 559,800 shares of the Company’s common stock, $0.0001 par value per share (the “Common Stock”), at an exercise price per share equal to the closing price per share of the Common Stock on the Nasdaq Global Select Market on the date your employment with the Company commences (the “Grant Date”). The stock option will vest over four years at the rate of 25% on the one-year anniversary of the Grant Date, subject to your continuing engagement with the Company as of that date, with the remaining shares to vest monthly over the following three years, subject to your continued engagement with the Company. The stock option will be granted either (i) pursuant to the inducement grant exception under NASDAQ Rule 5635(c)(4) and not pursuant to the Company’s 2013 Stock Incentive Plan or any other equity incentive plan of the Company, as an inducement that is material to your entering into employment with the Company or (ii) pursuant to the Company’s 2013 Stock Incentive Plan or a successor plan. In either event, the option grant shall also be subject to such other terms and conditions of the applicable Stock Option Agreement, and if applicable, the Company’s 2013 Stock Incentive Plan or a successor plan.

d. RSUs. Subject to the approval of the Compensation Committee, the Company will grant you 373,200 restricted stock units (“RSUs”) pursuant to the Company’s 2013 Stock Incentive Plan or a successor plan. The RSUs will vest over four years at the rate of 25% on the one-year anniversary of the applicable grant date, subject to your continuing engagement with the Company as of that date, with the remaining RSUs to vest monthly over the following three years, subject to your continued engagement with the Company. These RSUs shall be subject to the terms and conditions of the Company’s 2013 Stock Incentive Plan and the applicable RSU Agreement.

e. PTO. You will accrue Paid Time Off (“PTO”), which includes all vacation, sick, and personal time (combined) at a rate of 13.34 hours per month, accrued on the last day of the month. This is equal to about 160 hours or 4 weeks of PTO per year. You will also receive paid holidays according to the Company’s holiday schedule.

f. Benefits. Commencing on your first day of employment (subject to eligibility criteria and waiting periods associated with each individual plan), you may participate in all Company benefits as outlined in the Benefits at a Glance Overview which accompanies this offer letter, subject to the terms and conditions of any applicable plan documents for such benefits. The benefit programs made available by the Company, and the rules, terms, and conditions for participation in such benefit plans, may be changed by the Company at any time without advance notice. The Company shall reimburse you up to a maximum of $25,000 for your reasonable professional fees and expenses paid or incurred by you in connection with the negotiation and preparation of this offer letter and other documents related to your employment with the Company.

g. Sign-On Bonus. The Company agrees to pay you a cash bonus in the amount of $700,000, less applicable taxes and withholdings, in three separate payments (each a “Milestone Payment”), payable the payroll period following each of the Milestone Dates and in such amounts (each as set forth in the following chart) for a total not exceeding $700,000, contingent upon your commencement of employment with the Company (with respect to Milestone Payment 1) and, with respect to Milestone Payments 2-3 below, contingent upon your continued employment through such applicable Milestone Date:

Milestone Payment Milestone Date Amount
Milestone Payment 1 The date upon which you commence employment with the Company (“hire<br>date”) $ 300,000
Milestone Payment 2 The one-year anniversary of your hire<br>date $ 200,000
Milestone Payment 3 The two-year anniversary of your hire<br>date $ 200,000

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EXECUTION VERSION

If for any reason you terminate your employment with the Company (other than for Good Reason, as defined below) or are terminated by the Company for Cause (as defined below) prior to the one-year anniversary of each applicable Milestone Date, you will be obligated to repay the net amount of the applicable Milestone Payment received by you in connection with such Milestone Date. If for any reason you terminate your employment with the Company (other than for Good Reason) or are terminated by the Company for Cause after the one-year anniversary of a Milestone Date but prior to the two-year anniversary of an applicable Milestone Date, you will be obligated to repay to the Company an amount equal to 50% of the Milestone Payment received by you in connection with such Milestone Date. You agree that any portion of the Milestone Payments owed to the Company will be repaid immediately upon the termination of your employment by you (other than for Good Reason) or the termination of your employment by the Company for Cause. Notwithstanding the forgoing, in the event that the Company terminates your employment without Cause or you resign from employment with the Company for Good Reason, you will be eligible to receive any unpaid Milestone Payments in one lump sum as severance pay in accordance with Section 2 of this letter agreement, subject to your timely execution of the release agreement referenced therein.

  1. Severance Benefits

If your employment is terminated without Cause, or you resign for Good Reason, the Company will, provided that you timely execute a severance and release of claims agreement in a form to be provided by the Company (which will include, at a minimum, a release of all releasable claims, non-disparagement, confidentiality, and cooperation obligations, a reaffirmation of your continuing obligations under the Non-Disclosure, Inventions Assignment, Non-Competition, and Non-Solicitation Agreement, and an agreement not to compete with the Company for twelve (12) months following your separation from employment) (the “release agreement”) provide you with the following severance package: (a) pay you severance pay in the form of salary continuation for, eighteen (18) months (the “Severance Period”); (b) pay you, in a lump sum, a pro-rated Target Bonus for the year in which your termination from employment occurs, calculated by multiplying the Target Bonus by a fraction, the numerator of which is the number of full months of employment with the Company you completed in such year and the denominator of which is 12; (c) provided you elect to continue you and your eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to the Consolidated Omnibus Budget Reconciliation Act of 1986 (“COBRA”), the Company will pay the monthly premium to

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EXECUTION VERSION

continue such coverage for the lesser of (i) the Severance Period and (ii) the end of the calendar month in which you become eligible to receive group health plan coverage under another employee benefit plan; and (d) an opportunity to enter into a consulting arrangement with the Company, pursuant to the Company’s standard consulting agreement, for an expected term of twelve (12) months, during which term, and subject to your provision of services during the term, you will be compensated for services performed and any unvested equity awards granted by the Company shall continue to vest.

Notwithstanding the foregoing, if the Company (which, for the purposes of this paragraph, includes any successor entity) terminates your employment without Cause, or you resign for Good Reason, each within one year following the consummation of a Change in Control, then the Company (or its successor entity) will, in lieu of the severance benefits set forth in the preceding paragraph and provided that you timely execute the release agreement, (a) pay you severance pay in the form of salary continuation of your base salary for eighteen (18) months (or such greater amount specified in any Company severance plan under which you are eligible); (b) pay to you an amount equal to 150% of your target annual bonus for the year in which your termination occurs, which amount shall be payable in a lump sum on the date that the first continued salary payment is made to you under your currently effective agreement with the Company; and (c) provided you elect to continue you and your eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to COBRA, the Company will pay the monthly premium to continue such coverage for the lesser of (i) the Severance Period and (ii) the end of the calendar month in which you become eligible to receive group health plan coverage under another employee benefit plan.

In each case, the release agreement must be executed and any revocation period with respect to such release agreement must expire no later than 60 days following your termination of employment. Except as expressly set forth herein, any severance pay under this Section 2 will be paid in the form of salary continuation in accordance with the Company’s payroll procedures. Additionally, any severance payments under this letter agreement (including, if applicable, with respect to any Milestone Payments in Section 1) will begin, and any lump sum payments will be made, in the first pay period beginning after the release agreement becomes binding, provided that if the foregoing sixty (60) day period would end in a calendar year subsequent to the year in which Employee’s employment ends, payments will not begin or occur before the first payroll period of the subsequent year.

Change in Control” shall mean the sale of all or substantially all of the outstanding shares of capital stock, assets or business of the Company, by merger, consolidation, sale of assets or otherwise (other than a transaction in which all or substantially all of the individuals and entities who were beneficial owners of the capital stock of the Company immediately prior to such transaction beneficially own, directly or indirectly, more than 50% of the outstanding securities (on an as-converted to Common Stock basis) entitled to vote generally in the election of directors of the (i) resulting, surviving or acquiring corporation in such transaction in the case of a merger, consolidation or sale of outstanding shares, or (ii) acquiring corporation in the case of a sale of assets; provided that, where required for compliance with Section 409A, the event described above is also a change in control event as set forth in Treas. Reg. Section 1.409A-3(i)(5).

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EXECUTION VERSION

“Cause” shall mean: (i) your conviction by a court of competent jurisdiction of theft or misappropriation by you of assets of the Company, (ii) your conviction by a court of competent jurisdiction of fraud committed by you or at your direction, (iii) your conviction by a court of competent jurisdiction of, or pleading “guilty” or “no contest” to, (a) a felony or (b) any other criminal charge that has, or could be reasonably expected to have, a material adverse impact on the Company or the performance of your duties, and/or (iv) a good faith determination by the Board in its sole discretion of (w) an act or acts of material willful misconduct by you in violation of law or government regulation in the course of your employment by the Company, (x) your willful, repeated and material failure to perform, or gross negligence in the performance of, the duties which are reasonably assigned to you by the Board, which failure, if curable by you (as determined in good faith by the Board), is not cured to the reasonable satisfaction of the Board within thirty (30) days after receipt of written notice from the Board of such failure, (y) your material breach of any agreement to which you and the Company are party (including, without limitation, the Non-Disclosure, Inventions Assignment, Non-Competition, and Non-Solicitation Agreement), and/or (z) your failure to fully participate in or otherwise cooperate with a Company investigation as may be reasonably requested by the Company.

“GoodReason” shall mean (i) the assignment to you of any duties inconsistent in any adverse, material respect with your position, authority, duties, reporting relationship, or responsibilities as then constituted, or any other action by the Board which results in a material diminution in such position, authority, duties or responsibilities, (ii) a material reduction in your Base Salary or Target Bonus, except to the extent that any such benefit is replaced with a comparable benefit, or a reduction in scope or value thereof, other than as a result of across-the board reductions or terminations affecting employees of the Company generally, or (iii) a requirement that you, without your prior consent, regularly report to work at a location that is thirty (30) miles or more away from your then current place of work; provided, however, that the conditions described immediately above in clauses (i) through (iii) shall not give rise to a termination for Good Reason, unless you have notified the Board in writing within thirty (30) days of the first occurrence of the facts and circumstances claimed to provide a basis for the termination for Good Reason, the Company has failed to correct the condition within thirty (30) days after the Board’s receipt of such written notice, and you actually terminate employment with the Company within sixty (60) days of the first occurrence of the condition. For the avoidance of doubt, your required travel on the Company’s business shall not be deemed a relocation of your principal office under clause (iii), above.

  1. Miscellaneous

a. Section 409A. It is intended that this letter agreement comply with or be exempt from Section 409A of the Internal Revenue Code of 1986, and the Treasury Regulations and IRS guidance thereunder (collectively referred to as “Section 409A”), and notwithstanding anything to the contrary herein, it shall be administered, interpreted, and construed in a manner consistent with Section 409A. To the extent that any reimbursement, fringe benefit, or other, similar plan or arrangement in which you participate provides for a “deferral of compensation” within the meaning of Section 409A, (a) the amount of expenses eligible for reimbursement provided to you during any calendar year shall not affect the amount of expenses eligible for reimbursement or in-kind benefits provided to you in any other calendar year, (b) the reimbursements for

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EXECUTION VERSION

expenses for which you are entitled to be reimbursed shall be made on or before the last day of the calendar year following the calendar year in which the applicable expense is incurred, (c) the right to payment or reimbursement or in-kind benefits hereunder may not be liquidated or exchanged for any other benefit, and (d) the reimbursements shall be made pursuant to objectively determinable and nondiscretionary Company policies and procedures regarding such reimbursement of expenses. If and to the extent required to comply with Section 409A, no payment or benefit required to be paid under this letter agreement on account of termination of your employment shall be made unless and until you incur a “separation from service” within the meaning of Section 409A. In the case of any amounts payable to you under this letter agreement that may be treated as payable in the form of “a series of installment payments”, as defined in Treasury Regulation Section 1.409A-2(b)(2)(iii), your right to receive such payments shall be treated as a right to receive a series of separate payments for purposes of such Treasury Regulation. If any paragraph of this letter agreement provides for payment within a time period, the determination of when such payment shall be made within such time period shall be solely in the discretion of the Company. If and to the extent any portion of any payment, compensation or other benefit provided to you in connection with your employment termination is determined to constitute “nonqualified deferred compensation” within the meaning of Section 409A of the Code, and you are a specified employee as defined in Section 409A(a)(2)(B)(i) of the Code, as determined by the Company in accordance with its procedures, by which determination you hereby agree that you are bound, such portion of the payment, compensation or other benefit shall not be paid before the earlier of (i) the expiration of the six month period measured from the date of your “separation from service” (as determined under Section 409A of the Code) or (ii) the tenth day following the date of your death following such separation from service (the “New Payment Date”). The aggregate of any payments that otherwise would have been paid to you during the period between the date of separation from service and the New Payment Date shall be paid to you in a lump sum in the first payroll period beginning after such New Payment Date, and any remaining payments will be paid on their original schedule.

b. Indemnification. You shall be entitled to indemnification to the maximum extent permitted by both applicable law and the Company’s charter, with terms no less favorable than provided to any other Company executive officer or director and subject to the terms of any separate written indemnification agreement. At all times during your employment, the Company shall maintain in effect a directors and officers liability insurance policy with you as a covered officer.

c. Withholding. The Company shall withhold from any compensation or benefits payable under this letter agreement any federal, state and local income, employment or other similar taxes as may be required to be withheld pursuant to any applicable law or regulation.

d. If you accept the terms of this offer, your employment with the Company constitutes at-will employment, and you are free to resign at any time, and for any or no reason. Similarly, the Company is free to terminate its employment relationship with you at any time, with or without cause. Although your job duties, title, compensation and benefits, as well as the Company’s personnel policies and procedures, may change from time to time, the “at-will” nature of your employment may only be changed by a written agreement signed by you and the Board, which expressly states the intention to modify the at-will nature of your employment. Similarly, nothing in this letter shall be construed as an agreement, either express or implied, to pay you

6

EXECUTION VERSION

any compensation or grant you any benefit beyond the end of your employment with the Company. We request that, in the event of resignation, you provide a notice period of at least two weeks.

e. Your offer is contingent upon the successful completion of an employment, and criminal background check (which will require you to complete and sign all necessary consent forms authorizing the Company or its designee to perform these background inquiries). The Company may also require that you provide names and contact information so we may conduct reference checks about your past employment.

f. For purposes of federal immigration law, you will be required to provide to the Company documentary evidence of your identity and eligibility for employment in the United States. Provided you and the Company do not agree to an alternate interim arrangement with respect to where you perform your services, such documentation must be provided to us within three (3) business days of your date of hire. The Company agrees to sponsor and pay for the application, administration, and reasonable attorneys’ fees associated with a petition on your behalf to secure valid work authorization for you to work for the Company.

g. As a condition of your employment, you are also required to sign and comply with a Non-Disclosure, Inventions Assignment, Non-Competition, and Non-Solicitation Agreement effective your first day of employment. A copy of that agreement accompanies this offer letter. Please address any concerns you may have with this agreement prior to your first day of employment at the Company. You acknowledge that your receipt of the grant of equity set forth in this offer letter is contingent upon your agreement to the non-competition provisions set forth in the Non-Disclosure, Inventions Assignment, Non-Competition, and Non-Solicitation Agreement, and that such consideration is fair and reasonable in exchange for your compliance with such non-competition obligations. You further acknowledge that you were provided with a copy of the Non-Disclosure, Inventions Assignment, Non-Competition, and Non-Solicitation Agreement prior to your receipt of this letter and more than ten (10) business days prior to your commencement of employment with the Company.

h. In return for the compensation payments set forth in this letter, you agree to devote your full business time, best efforts, skill, knowledge, attention, and energies to the advancement of the Company’s business and interests and to the performance of your duties and responsibilities as an employee of the Company and not to engage in any other business activities without prior approval from the Company. Notwithstanding the foregoing, you may serve on boards of directors for both public and private companies subject to the approval of the Board and otherwise participate in educational, social, religious and civic organizations (including serving on boards of same) without the prior written approval of the Board, in each case so long as such activities do not interfere or conflict with your obligations to the Company (including, without limitation, the obligations set forth in the attached Non-Disclosure, Inventions Assignment, Non-Competition, and Non-Solicitation Agreement).

i. As an employee of the Company, you will be required to comply with all Company policies and procedures. Violations of the Company’s policies may lead to immediate termination of your employment. Further, the Company’s premises, including all workspaces, furniture,

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EXECUTION VERSION

documents, and other tangible materials, and all information technology resources of the Company (including computers, data and other electronic files, and all internet and email) are subject to oversight and inspection by the Company at any time. Company employees should have no expectation of privacy with regard to any Company premises, materials, resources, or information.

j. To accept the Company’s offer, please sign and date this letter in the space provided. By signing this letter, you are representing that you have full authority to accept this position and perform the duties of the position without conflict with any other legal or contractual obligations, and that you are not involved in any situation that might create, or appear to create, a conflict of interest with respect to your loyalty to or duties for the Company. You additionally represent and warrant that you have not taken or shared with the Company any confidential or proprietary information belonging to any former employer or other third party, and that you will at no time during the course of your employment with the Company use or disclose any such confidential or proprietary information of another party without that party’s express consent.

This letter, together with the other documents and agreements referenced herein, sets forth all of the terms of your employment with the Company, and supersedes any prior representations or agreements including, but not limited to, any representations made during your recruitment, interviews or pre-employment negotiations, whether written or oral. This letter may not be modified or amended except by a written agreement signed by the Company and you. This offer of employment will terminate if it is not accepted, signed and returned by close of business on April 30, 2021.

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EXECUTION VERSION

We look forward to your favorable reply and to working with you at Karyopharm!

Sincerely,

Signature: /s/ Michael Mano
Michael Mano
Senior Vice President and General Counsel, Karyopharm Therapeutics
Date: April 28, 2021
--- ---

The foregoing correctly sets forth the terms of my employment by Karyopharm Therapeutics Inc. I am not relying on any representations pertaining to my employment other than those set forth above.

Signature: /s/ Richard Paulson
Richard Paulson
Date: April 28, 2021
--- ---

9

EX-10.2

Exhibit 10.2

EXECUTION VERSION

KARYOPHARMTHERAPEUTICS INC.

April 28, 2021

Michael Kauffman, M.D., Ph.D.

c/o Karyopharm Therapeutics Inc.

85 Wells Avenue

Newton, MA 02459

Dear Michael:

Subject to your execution below, this letter hereby amends the employment letter, dated December 6, 2010, as amended on January 23, 2015 and August 28, 2020, between you and Karyopharm Therapeutics Inc. (the “Company”) and provides for the following terms of employment, effective May 3, 2021 (the “Effective Date”). For the avoidance of doubt, nothing herein supersedes the Non-Disclosure and Inventions Assignment Agreement you previously executed with the Company, which remains in effect, unaltered, in all respects.

  1. Position. You will serve as Senior Clinical Advisor, reporting to the Company’s Chief Executive Officer (“CEO”). In this role you will have the responsibilities customarily associated with such position and such additional responsibilities consistent with your senior executive status that are assigned to you by the Company’s CEO. During the term of your employment with the Company, you will devote the required professional time and efforts to the business of the Company, and you may engage in other activities that may be approved in advance by the Company’s Board of Directors (the “Board”), including, but not limited to, those activities described in Exhibit A which have been approved by the Board prior to the Effective Date. You will remain a director on the Board and the Board will nominate you as a candidate for election as a director until no earlier than the second anniversary of the Effective Date.

  2. Compensation.

a. Base Salary. You will be paid an annual base salary of $388,125. Your base salary will be payable pursuant to the Company’s regular payroll policy. Your salary will be reviewed annually and may be increased by the Board in connection with any such review.

b. Bonus Program. You will be eligible for an annual bonus that targets fifty percent (50%) of the total annual base salary payable to you for the applicable calendar year based upon achievement of certain performance goals and corporate milestones established by the Board in consultation with you. Achievement of goals will be determined in the sole discretion of the Board or a Compensation Committee of the Board. To earn any part of the bonus, you must be employed on December 31st of the applicable bonus year, and such bonus shall be paid no later than March 15th of the year immediately following the year to which the applicable annual bonus relates. Your bonus target will be reviewed annually and may be modified by the Board in connection with any such review.

c. Equity Grants. You are eligible for annual equity grants in the Company’s sole discretion, beginning in calendar year 2022.

EXECUTION VERSION

d. Withholding. The Company shall withhold from any compensation or benefits payable under this letter agreement any federal, state, and local income, employment or other similar taxes as may be required to be withheld pursuant to any applicable law or regulation.

  1. Benefits.

a. Vacation and Holidays. You will be eligible to accrue five weeks of paid vacation each year and take Company paid holidays consistent with the Company’s vacation policy offered to other executive level employees of the Company.

b. Other. You will be eligible to participate in such medical, retirement and other benefits as are approved by the Board and made available to other executive level employees of the Company. As is the case with all employee benefits, such benefits will be governed by the terms and conditions of applicable plans or policies, which are subject to change or discontinuation at any time.

  1. At-Will Employment. Your employment with the Company is and shall at all times during your employment hereunder be “at-will” employment. The Company or you may terminate your employment at any time for any reason, with or without Cause, as defined in Section 5, and with or without notice. The “at-will” nature of your employment shall remain unchanged during your tenure as an employee of the Company and may only be changed by an express written agreement that is signed by you and the Board.

  2. Termination of Employment.

a. Upon your separation from employment with the Company for any reason, you will receive: (i) any unpaid base salary for services rendered prior to the date of termination or resignation; (ii) any earned but unpaid annual bonus for any year prior to the year in which termination of employment occurs; (iii) reimbursement of any un-reimbursed business expenses incurred as of the date of termination or resignation in accordance with the Company’s ,)reimbursement policy; (iv) accrued but unused vacation (if applicable) earned through the effective resignation or termination date; and (v) all other payments, benefits or fringe benefits to which you shall be entitled under the terms of any applicable compensation arrangement or benefit, equity or fringe benefit plan or program or grant or this letter agreement (collectively, clauses (i) through (v) shall be referred herein as the “Accrued Benefits”), and, except as set forth in paragraph (b) or (c) below, you will not be entitled to any other compensation except as the Board may otherwise agree in its sole discretion. If the Company terminates your employment for Cause, at any time, then you will receive no additional compensation other than the Accrued Benefits, except that the benefits described in Section 5(a)(ii) shall not be paid to you.

b. If, on or before the second anniversary of the Effective Date, the Company terminates your employment other than for “Cause” or if you terminate your employment for “Good Reason,” as such terms are defined below, subject to you providing the Company with a fully effective separation agreement that includes a general release of claims in a form and manner reasonably satisfactory to the Company (the “Release”) within the 60-day period

EXECUTION VERSION

following the date of termination (or such shorter period, not shorter than twenty-one (21) days, as may be directed by the Company), the Company shall, in addition to the amounts payable under paragraph (a): (i) in the case of such termination that does not occur within the twelve (12) month period following a Change of Control, (x) pay you severance pay in the form of continuation of base salary at the rate of $646,875 per annum for eighteen (18) months (the “Non-COC Severance Period”) in accordance with the Company’s payroll practice; and (y) provided you elect to continue your and your eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to the Consolidated Omnibus Budget Reconciliation Act of 1986 (“COBRA”), pay the monthly premium to continue such coverage for the lesser of the eighteen (18) full calendar months immediately following the month in which the termination of your employment occurs and the end of the calendar month in which you become eligible to receive group health plan coverage under another employee benefit plan; or (ii) in the case of such termination that occurs in the twelve (12) month period following a Change of Control, (x) pay you severance pay in the form of continuation of base salary at the rate of $646,875 per annum for eighteen (18) months (the “COC Severance Period”) in accordance with the Company’s payroll practice; (y) pay to you an amount equal to 150% of your target annual bonus for the year in which your termination occurs, less applicable taxes and withholdings, which amount shall be payable in a lump sum on the date that the first continued salary payment is made to you under this letter agreement; and (z) provided you elect to continue your and your eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to COBRA, pay the monthly premium to continue such coverage for the lesser of the eighteen (18) full calendar months immediately following the month in which the termination of your employment occurs and the end of the calendar month in which you become eligible to receive group health plan coverage under another employee benefit plan.

c. If, following the second anniversary of the Effective Date, the Company terminates your employment other than for “Cause” or if you terminate your employment for “Good Reason”, as such terms are defined below, subject to you providing the Company with the Release within the 60-day period following the date of termination (or such shorter period, not shorter than twenty-one (21) days, as may be directed by the Company), the Company shall, in addition to the amounts payable under paragraph (a), pay you severance pay in a lump sum in the amount of $323,500, less applicable taxes and withholdings, in the first payroll period after the Release becomes fully effective.

d. Except as expressly set forth herein, any severance pay will be paid ratably in accordance with the Company’s regular payroll practices beginning in the Company’s first regular payroll cycle after the Release becomes effective. Notwithstanding anything to the contrary, if the 60th day referenced in (b) or (c) above occurs in the calendar year following the date of your termination, then any severance pay shall be paid or begin no earlier than January 1 of such subsequent calendar year.

e. Solely for purposes of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), each salary continuation payment is considered a separate payment. To the extent that any severance benefit constitutes “non-qualified deferred compensation” under Section 409A of the Code, then such payments or benefits shall be payable only upon your “separation from service.” The determination of whether and when a separation from service has occurred shall be made in accordance with the presumptions set forth in

EXECUTION VERSION

Treasury Regulation Section 1.409A-l(h). Solely for this purpose, “Company” shall include all persons with whom the Company would be considered a single employer under Section 414(b) and 414(c) of the Internal Revenue Code. If, as of the date of your “separation from service” from the Company, you are not a “specified employee” (within the meaning of Section 409A), then each installment of the severance payments shall be made on the dates and terms set forth in this letter agreement.

If, as of the date of your “separation from service” from the Company, you are a “specified employee” (within the meaning of Section 409A), then: (A) each installment of the severance payments due under this letter agreement that, in accordance with the dates and terms set forth herein, will in all circumstances, regardless of when your separation from service occurs, be paid within the short-term deferral period (as defined under Section 409A) shall be treated as a short-term deferral within the meaning of Treasury Regulation Section 1.409A-1(b)(4) to the maximum extent permissible under Section 409A and shall be paid on the dates and terms set forth in this letter agreement; and (B) each installment of the severance payments due under this letter agreement that is not described the foregoing clause (A) and that would, absent this subsection, be paid within the six-month period following your “separation from service” from the Company shall not be paid until the date that is six months and one day after such separation from service (or, if earlier, your death) (the “New Payment Date”), with any such installments that are required to be delayed being accumulated during the six-month period and paid in a lump sum on the New Payment Date and any subsequent installments, if any, being paid in accordance with the dates and terms set forth herein; provided, however, that the preceding provisions of this sentence shall not apply to any installment of payments if and to the maximum extent that such installment is deemed to be paid under a separation pay plan that does not provide for a deferral of compensation by reason of the application of Treasury Regulation 1.409A-1(b)(9)(iii) (relating to separation pay upon an involuntary separation from service). Any installments that qualify for the exception under Treasury Regulation Section 1.409A-1(b)(9)(iii) must be paid no later than the last day of your second taxable year following the taxable year in which the separation from service occurs.

f. For purposes of this Section 5, the following terms will have the following meanings:

(i) “Good Reason” **** shall mean that you have complied with the “Good Reason Process,” as defined below, following the occurrence of any of the following events: (i) you are not elected to, or are removed from the Board; (ii) you are made to report to anyone other than the Company’s Chief Executive Officer; (iii) the Company’s corporate headquarters or your primary work location are located outside Massachusetts; or (iv) a material breach by the Company of this letter agreement or any other material agreement between you and the Company.

(ii) “Good Reason Process” **** shall mean that (i) you reasonably determine in good faith that a “Good Reason” condition has occurred; (ii) you notify the Company in writing of the first occurrence of the Good Reason condition within ten (10) days of the first occurrence of such condition; (iii) you cooperate in good faith with the Company’s efforts, for a period not less than thirty (30) days following such notice (the “Cure Period”), to remedy the condition; (iv) notwithstanding such efforts, the Good Reason condition continues to

EXECUTION VERSION

exist; and (v) you terminate your employment within thirty (30) days after the end of the Cure Period. If the Company cures the Good Reason condition during the Cure Period, Good Reason shall be deemed not to have occurred.

(iii) “Change of Control” **** shall mean any of the following:

  1. any “person,” as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended (the “Act”) (other than the Company, any of its subsidiaries, or any trustee, fiduciary or other person or entity holding securities under any employee benefit plan or trust of the Company or any of its subsidiaries), together with all “affiliates” and “associates” (as such terms are defined in Rule 12b-2 under the Act) of such person, shall become the “beneficial owner” (as such term is defined in Rule 13d-3 under the Act), directly or indirectly, of securities of the Company representing fifty percent (50%) or more of the combined voting power of the Company’s then outstanding securities having the right to vote in an election of the Board (“Voting Securities”) in such case other than as a result of an acquisition of securities directly from the Company;

  2. the date a majority of the members of the Board is replaced during any 12-month period by directors whose appointment or election is not endorsed by a majority of the members of the incumbent Board before the date of the appointment or election, provided further, that directors whose initial assumption of office is in connection with an actual or threatened election contest related to the election of directors of the Company will not be considered as members of the incumbent Board for purposes of this paragraph for a period of twelve (12) months following such initial assumption; or

  3. the consummation of (A) any consolidation or merger of the Company where the stockholders of the Company, immediately prior to the consolidation or merger, would not, immediately after the consolidation or merger, beneficially own (as such term is defined in Rule 13d-3 under the (Act), directly or indirectly, shares representing in the aggregate more than fifty percent (50%) of the voting shares of the Company issuing cash or securities in the consolidation or merger (or of its ultimate parent corporation, if any), or (B) any sale or other transfer (in one transaction or a series of transactions contemplated or arranged by any party as a single plan) of all or substantially all of the assets of the Company.

Notwithstanding the foregoing, a “Change in Control” shall not be deemed to have occurred for purposes of the foregoing clause (i) solely as the result of an acquisition of securities by the Company which, by reducing the number of shares of Voting Securities outstanding, increases the proportionate number of Voting Securities beneficially owned by any person to fifty percent (50%) or more of the combined voting power of all of the then outstanding Voting Securities; provided, however, that if any person referred to in this sentence shall thereafter become the beneficial owner of any additional shares of Voting Securities (other than pursuant to a stock split, stock dividend, or similar transaction or as a result of an acquisition of securities directly

EXECUTION VERSION

from the Company) and immediately thereafter beneficially owns fifty percent (50%) or more of the combined voting power of all of the then outstanding Voting Securities, then a “Change in Control” shall be deemed to have occurred for purposes of this letter agreement. Further, and solely to the extent necessary to comply with Section 409A of the Code, such event must constitute a “change in control” within the meaning of Treasury Regulation Section 1.409A-3(i)(5) in order for the payments and benefits hereunder to become payable.

g. If your employment terminates because of your death or Disability, then you will receive the Accrued Benefits. For purposes of this letter agreement, “Disability” shall be defined as your inability to have performed your material duties hereunder due to a physical or mental injury, infirmity or incapacity for one hundred eighty (180) days (including weekends and holidays) in any 365-day period.

h. For purposes of this letter agreement, “Cause” shall mean: (i) dishonesty, embezzlement, misappropriation of assets or property of the Company; (ii) gross negligence, willful misconduct, neglect of duties, theft, fraud or breach of fiduciary duty to the Company; (iii) violation of federal or state securities law; (iv) the conviction of a felony or any crime involving moral turpitude, including a plea of guilty or nolo contendre; (v) a material breach of any of the Company’s written policies related to conduct or ethics; or (vi) a material breach of the Nondisclosure and Inventions Assignment Agreement, dated January 1, 2011, between you and the Company (the “ConfidentialityAgreement”).

  1. Employee Confidentiality Agreement. As an employee of the Company, you will continue to have access to certain Company and third party confidential information, and you may during the course of your employment develop certain information or inventions which will be the property of the Company. You acknowledge the continuing effectiveness of the Confidentiality Agreement, and you further acknowledge that the changes to your responsibilities, duties, compensation, and title, as contemplated by this letter agreement (and which may occur hereafter), do not nullify or otherwise alter your obligations under the Confidentiality Agreement, which remain in full force and effect.

  2. Equity Forfeiture and Vesting. Effective as of the Effective Date, you hereby agree to, and do, fully and irrevocably surrender all right, title, and interest in the portions of the equity awards set forth on Exhibit B to this letter agreement. Any equity awards that are outstanding on the date hereof and that you continue to hold following such surrender are herein referred to as the “Remaining Equity Awards.” Your Remaining Equity Awards will continue to vest, become exercisable and free from early termination or forfeiture in accordance with their existing terms, provided that if the Company terminates your employment without Cause or you resign for Good Reason on or prior to March 1, 2025, then any of the remaining unvested portions of your Remaining Equity Awards will, subject to your execution of, and the effectiveness of, the Release required by Section 5 of this letter agreement, become vested, exercisable and free from early termination or forfeiture and, if such awards are stock options, will remain exercisable until the earlier of (x) March 1, 2026, and (y) the expiration date of such stock option.

  3. Resolution of Disputes. Any controversy or claim arising out of or relating to your employment, this letter agreement, its enforcement or interpretation, or because of an

EXECUTION VERSION

alleged breach, default, or misrepresentation in connection with any of its provisions, shall be submitted to arbitration in Boston, Massachusetts before a single arbitrator (applying Massachusetts law), in accordance with the National Rules for the Resolution of Employment Disputes then in effect of the American Arbitration Association (“AAA”) as modified by the terms and conditions of this Section 8; provided, however, that provisional injunctive relief may, but need not, be sought in a court of law while arbitration proceedings are pending, and any provisional injunctive relief granted by such court shall remain effective until the matter is finally determined by the arbitrator. The arbitrator shall be selected by mutual agreement of the parties or, if the parties cannot agree, by striking from a list of arbitrators supplied by AAA. The arbitrator shall issue a written opinion revealing, however briefly, the essential findings and conclusions upon which the award is based. Final resolution of any dispute through arbitration may include any remedy or relief which the arbitrator deems just and equitable. Any award or relief granted by the arbitrator hereunder shall be final and binding on the parties hereto and may be enforced by any court of competent jurisdiction.

The parties acknowledge that they are hereby waiving any rights to trial by jury in any action, proceeding or counterclaim brought by either of the parties against the other in connection with any matter whatsoever arising out of or in any way connected with this letter agreement or your employment.

The Company shall pay the arbitrator’s fees and arbitration expenses and any other costs associated with the arbitration or arbitration hearing that are unique to arbitration. The Company and you each shall separately pay its or your own deposition, witness, expert and attorneys’ fees and other expenses as and to the same extent as if the matter were being held in court unless otherwise provided by law. The arbitrator shall have the sole and exclusive power and authority to decide any and all issues of or related to whether this letter agreement or any provision of this letter agreement is subject to arbitration.

  1. Attorneys’ Fees. The Company shall reimburse you for your reasonable attorneys’ fees incurred in connection with the negotiation of this letter agreement.

  2. No Inconsistent Obligations. By accepting this offer of employment, you represent and warrant to the Company that you are under no obligations or commitments, whether contractual or otherwise, that are inconsistent with your obligations set forth in this letter agreement or that would be violated by your employment by the Company. You agree that you will not take any action on behalf of the Company or cause the Company to take any action that will violate any agreement that you have with a prior employer.

  3. Indemnification and Liability Insurance. The Company will provide you certain rights to indemnification as set forth in the Company’s standard form of indemnification agreement for executive officers and directors.

  4. Miscellaneous.

a. This letter agreement may be executed in several counterparts, each of which shall be deemed to be an original but all of which together will constitute one and the same instrument.

EXECUTION VERSION

b. The Company may only assign this letter agreement to a successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business and/or assets of the Company, provided, that such successor expressly agrees to assume and perform this letter agreement in the same manner and to the same extent that the Company would have been required to perform it if no such assignment had taken place, and “Company” shall include any such successor that assumes and agrees to perform this letter agreement, by operation of law or otherwise.

c. No provision of this letter agreement may be modified, waived, or discharged unless such waiver, modification or discharge is agreed to in writing and signed by you and such officer or director as may be designated by the Board. No waiver by either party hereto at any time of any breach by the other party hereto of, or compliance with, any condition or provision of this letter agreement to be performed by such other party shall be deemed a waiver of similar or dissimilar provisions or conditions at the same or at any prior or subsequent time.

d. The validity, interpretation, construction, and performance of this letter agreement shall be governed by the laws of the Commonwealth of Massachusetts without regard to the choice of law principles thereof.

If you have any further questions or require additional information, please feel free to contact me.

[Signatures appear on following page]

EXECUTION VERSION

Sincerely,

Signature: /s/ Michael Mano
Michael Mano
Senior Vice President and General Counsel, Karyopharm Therapeutics
Date: April 28, 2021
--- ---

The foregoing correctly sets forth the terms of my employment by Karyopharm Therapeutics Inc. I am not relying on any representations pertaining to my employment other than those set forth above.

Signature: /s/ Michael Kauffman
Michael Kauffman, M.D., Ph.D.
Date: April 28, 2021
--- ---

EXECUTION VERSION

Exhibit A

You may (i) engage in charitable, civic, educational, professional, community or industry affairs; (ii) serve on the boards of directors or advisory boards of other companies; and/or (iii) subject to written approval from the Nominating and Governance Committee, serve as a part-time employee or consultant for another company, so long as all such activities in this Exhibit A, either individually and/or in the aggregate, do not (x) materially detract from your ability to perform your duties; or (ii) violate your obligations pursuant to the Confidentiality Agreement.

EXECUTION VERSION

Exhibit B

Name Grant<br>Number Grant<br>Date Exercise<br>Price Outstanding<br>as of the<br>Effective<br>Date Options<br>to be<br>Forfeited<br>Under<br>Agreement Remaining<br>Equity<br>Awards
Michael Kauffman I000139 12/18/2013 $ 23.66 16,904 16,904
Michael Kauffman N000139 12/18/2013 $ 23.66 123,096 90,000 33,096
Michael Kauffman I000235 1/19/2015 $ 26.65 7,504 7,504
Michael Kauffman N000235 1/19/2015 $ 26.65 192,496 192,496
Total **** 340,000 **** 290,000 **** 50,000

EX-10.3

Exhibit 10.3

EXECUTION VERSION

KARYOPHARMTHERAPEUTICS INC.

April 28, 2021

Sharon Shacham, Ph.D., M.B.A.

c/o Karyopharm Therapeutics Inc.

85 Wells Avenue

Newton, MA 02459

Dear Sharon:

Subject to your execution below, this letter hereby amends the employment letter, dated October 19, 2010, as previously amended on December 6, 2010, January 23, 2015, and August 28, 2020, between you and Karyopharm Therapeutics Inc. (the “Company”) and provides for the following terms of employment, effective May 3, 2021 (the “Effective Date”). For the avoidance of doubt, nothing herein supersedes the Non-Disclosure and Inventions Assignment Agreement you previously executed with the Company, which remains in effect, unaltered, in all respects.

  1. Position. You will serve as Chief Scientific Officer, reporting to the Company’s Chief Executive Officer (“CEO”). In this role you will have the responsibilities customarily associated with such position and such additional responsibilities consistent with your senior executive status that are assigned to you by the Company’s CEO; provided, however, that it is expressly contemplated that beginning on January 1, 2022 (the “Transition Date”), you will no longer have any direct management responsibilities. During the term of your employment with the Company, you will devote the required professional time and efforts to the business of the Company, and you may engage in other activities that may be approved in advance by the Company’s Board of Directors (the “Board”) including, but not limited, to those activities described in Exhibit A, which have been approved by the Board prior to the Effective Date. As of the Effective Date and through no earlier than the second anniversary of the Transition Date, you will also continue to serve as Chair of the Scientific Advisory Board.

  2. Compensation.

a. Base Salary. For the remainder of 2021, you will continue to be paid an annual base salary of Four Hundred Ninety-Nine Thousand and Nine Hundred Five Dollars ($499,905). As of the Transition Date, you will be paid an annual base salary of Three Hundred Thousand Dollars ($300,000). Your base salary will be payable pursuant to the Company’s regular payroll policy.

b. Bonus Program. You will be eligible for an annual bonus that targets fifty percent (50%) of the total annual base salary payable to you for the applicable calendar year based upon achievement of certain performance goals and corporate milestones established by the Board in consultation with you. Achievement of goals will be determined in the sole discretion of the Board or a Compensation Committee of the Board. To earn any part of the bonus, you must be employed on December 31st of the applicable bonus year and such bonus shall be paid no later than March 15th of the year immediately following the year to which the applicable annual bonus relates. Your bonus target will be reviewed annually and may be modified by the Board in connection with any such review.

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c. Equity Grants. For so long as you continue to serve as Chief Scientific Officer of the Company, you will remain eligible to receive annual equity grants on the same basis as the Company’s other executive officers in good standing, as such awards are determined by the Board in its sole discretion.

d. Withholding. The Company shall withhold from any compensation or benefits payable under this letter agreement any federal, state and local income, employment or other similar taxes as may be required to be withheld pursuant to any applicable law or regulation.

3. Benefits.

a. Vacation and Holidays. You will be eligible to accrue five weeks of paid vacation each year and take Company paid holidays consistent with the Company’s vacation policy offered to other executive level employees of the Company.

b. Other. You will be eligible to participate in such medical, retirement and other benefits as are approved by the Board and made available to other executive level employees of the Company. As is the case with all employee benefits, such benefits will be governed by the terms and conditions of applicable plans or policies, which are subject to change or discontinuation at any time.

  1. At-Will Employment. Your employment with the Company is and shall at all times during your employment hereunder be “at-will” employment. The Company or you may terminate your employment at any time for any reason, with or without Cause, as defined in Section 5, and with or without notice. The “at-will” nature of your employment shall remain unchanged during your tenure as an employee of the Company and may only be changed by an express written agreement that is signed by you and the Board.

  2. Termination of Employment.

a. Upon your separation from the Company for any reason, you will receive: (i) any unpaid base salary for services rendered prior to the date of termination or resignation; (ii) any earned but unpaid annual bonus for any year prior to the year in which termination of employment occurs; (iii) reimbursement of any un-reimbursed business expenses incurred as of the date of termination or resignation in accordance with the Company’s reimbursement policy; (iv) accrued but unused vacation (if applicable) earned through the effective resignation or termination date; and (v) all other payments, benefits or fringe benefits to which you shall be entitled under the terms of any applicable compensation arrangement or benefit, equity or fringe benefit plan or program or grant or this letter agreement (collectively, clauses (i) through (v) shall be referred herein as the “Accrued Benefits”), and, except as set forth in paragraph (b) or (c) below, you will not be entitled to any other compensation except as the Board may otherwise agree in its sole discretion. If the Company terminates your employment for Cause, at any time, then you will receive no additional compensation other than the Accrued Benefits, except that the benefits described in Section 5(a)(ii) shall not be paid to you.

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b. If, on or before the second anniversary of the Transition Date, the Company terminates your employment other than for “Cause” or if you terminate your employment for “Good Reason”, as such terms are defined below, subject to you providing the Company with a fully effective separation agreement that includes a general release of claims in a form and manner reasonably satisfactory to the Company (the “Release”) within the 60-day period following the date of termination (or such shorter period, not shorter than twenty-one (21) days, as may be directed by the Company)), the Company shall, in addition to the amounts payable under paragraph (a): (i) in the case of such termination that does not occur in the twelve (12) month period following a Change of Control, (x) pay you severance pay in the form of continuation of base salary at the rate of $499,905 per annum for eighteen (18) months (the “Non-COC Severance Period”) in accordance with the Company’s payroll practice; and (y) provided you elect to continue your and your eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to the Consolidated Omnibus Budget Reconciliation Act of 1986 (“COBRA”), pay the monthly premium to continue such coverage for the lesser of the eighteen (18) full calendar months immediately following the month in which the termination of your employment occurs and the end of the calendar month in which you become eligible to receive group health plan coverage under another employee benefit plan; or (ii) in the case of such termination that occurs within the twelve (12) month period following a Change of Control, (x) pay you severance pay in the form of continuation of base salary at the rate of $499,905 per annum for eighteen (18) months (the “COC Severance Period”) in accordance with the Company’s payroll practice; (y) pay to you an amount equal to 150% of your target annual bonus for the year in which your termination occurs, less applicable taxes and withholdings, which amount shall be payable in a lump sum on the date that the first continued salary payment is made to you under this letter agreement; and (z) provided you elect to continue your and your eligible dependents’ participation in the Company’s medical and dental benefit plans pursuant to COBRA, pay the monthly premium to continue such coverage for the lesser of the eighteen (18) full calendar months immediately following the month in which the termination of your employment occurs and the end of the calendar month in which you become eligible to receive group health plan coverage under another employee benefit plan (as applicable, the “Severance Benefits”).

c. If, following the second anniversary of the Transition Date, the Company terminates your employment other than for “Cause” or if you terminate your employment for “Good Reason”, as such terms are defined below, subject to you providing the Company with the Release within the 60-day period following the date of termination (or such shorter period, not less than twenty-one (21) days, as may be directed by the Company), the Company shall, in addition to the amounts payable under paragraph (a), pay you severance pay in a lump sum in the amount of $150,000, less applicable taxes and withholdings, in the first payroll period after the Release becomes fully effective (subject to the last sentence of paragraph (d) below).

d. Except as expressly set forth herein, any severance pay will be paid ratably in accordance with the Company’s regular payroll practices beginning in the Company’s first regular payroll cycle after the Release becomes effective. In any event, if the 60th day referenced in (b) or (c) above occurs in the calendar year following the date of your termination, then the severance pay shall be paid or begin no earlier than January 1 of such subsequent calendar year.

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e. Solely for purposes of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), each salary continuation payment is considered a separate payment. To the extent that any Severance Benefit constitutes “non-qualified deferred compensation” under Section 409A of the Code, then such payments or benefits shall be payable only upon your “separation from service.” The determination of whether and when a separation from service has occurred shall be made in accordance with the presumptions set forth in Treasury Regulation Section 1.409A-l (h). Solely for this purpose, the “Company” shall include all persons with whom the Company would be considered a single employer under Section 414(b) and 414(c) of the Internal Revenue Code. If, as of the date of your “separation from service” from the Company, you are not a “specified employee” (within the meaning of Section 409A), then each installment of the severance payments shall be made on the dates and terms set forth in this letter agreement.

If, as of the date of your “separation from service” from the Company, you are a “specified employee” (within the meaning of Section 409A), then: (A) each installment of the severance payments due under this letter agreement that, in accordance with the dates and terms set forth herein, will in all circumstances, regardless of when your separation from service occurs, be paid within the short-term deferral period (as defined under Section 409A) shall be treated as a short-term deferral within the meaning of Treasury Regulation Section 1.409A-1(b)(4) to the maximum extent permissible under Section 409A and shall be paid on the dates and terms set forth in the letter agreement; and (B) each installment of the severance payments due under this letter agreement that is not described the foregoing clause (A) and that would, absent this subsection, be paid within the six-month period following your “separation from service” from the Company shall not be paid until the date that is six months and one day after such separation from service (or, if earlier, your death) (the “New Payment Date”), with any such installments that are required to be delayed being accumulated during the six-month period and paid in a lump sum on the New Payment Date and any subsequent installments, if any, being paid in accordance with the dates and terms set forth herein; provided, however, that the preceding provisions of this sentence shall not apply to any installment of payments if and to the maximum extent that such installment is deemed to be paid under a separation pay plan that does not provide for a deferral of compensation by reason of the application of Treasury Regulation 1.409A-1(b)(9)(iii) (relating to separation pay upon an involuntary separation from service). Any installments that qualify for the exception under Treasury Regulation Section 1.409A-1(b)(9)(iii) must be paid no later than the last day of your second taxable year following the taxable year in which the separation from service occurs.

f. For purposes of this Section 5, the following terms will have the following meanings:

(i) “Good Reason” **** shall mean that you have complied with the “Good Reason Process,” as defined below, following the occurrence of any of the following events: (i) you are made to report to anyone other than the Company’s Chief Executive Officer; (ii) the Company’s corporate headquarters or your primary work location are located outside Massachusetts; or (iii) a material breach by the Company of this letter agreement or any other material agreement between you and the Company.

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(ii) “Good Reason Process” **** shall mean that (i) you reasonably determine in good faith that a “Good Reason” condition has occurred; (ii) you notify the Company in writing of the first occurrence of the Good Reason condition within ten (10) days of the first occurrence of such condition; (iii) you cooperate in good faith with the Company’s efforts, for a period not less than thirty (30) days following such notice (the “Cure Period”), to remedy the condition; (iv) notwithstanding such efforts, the Good Reason condition continues to exist; and (v) you terminate your employment within thirty (30) days after the end of the Cure Period. If the Company cures the Good Reason condition during the Cure Period, Good Reason shall be deemed not to have occurred.

(iii) “Change of Control” **** shall mean any of the following:

  1. any “person,” as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended (the “Act”) (other than the Company, any of its subsidiaries, or any trustee, fiduciary or other person or entity holding securities under any employee benefit plan or trust of the Company or any of its subsidiaries), together with all “affiliates” and “associates” (as such terms are defined in Rule 12b-2 under the Act) of such person, shall become the “beneficial owner” (as such term is defined in Rule 13d-3 under the Act), directly or indirectly, of securities of the Company representing fifty percent (50%) or more of the combined voting power of the Company’s then outstanding securities having the right to vote in an election of the Board (“Voting Securities”) in such case other than as a result of an acquisition of securities directly from the Company;

  2. the date a majority of the members of the Board is replaced during any 12-month period by directors whose appointment or election is not endorsed by a majority of the members of the incumbent Board before the date of the appointment or election, provided, further that directors whose initial assumption of office is in connection with an actual or threatened election contest related to the election of directors of the Company will not be considered as members of the incumbent Board for purposes of this paragraph for a period of twelve (12) months following such initial assumption; or

  3. the consummation of (A) any consolidation or merger of the Company where the stockholders of the Company, immediately prior to the consolidation or merger, would not, immediately after the consolidation or merger, beneficially own (as such term is defined in Rule 13d-3 under the Act), directly or indirectly, shares representing in the aggregate more than fifty percent (50%) of the voting shares of the Company issuing cash or securities in the consolidation or merger (or of its ultimate parent corporation, if any), or (B) any sale or other transfer (in one transaction or a series of transactions contemplated or arranged by any party as a single plan) of all or substantially all of the assets of the Company.

Notwithstanding the foregoing, a “Change in Control” shall not be deemed to have occurred for purposes of the foregoing clause (i) solely as the result of an acquisition of securities by the

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Company which, by reducing the number of shares of Voting Securities outstanding, increases the proportionate number of Voting Securities beneficially owned by any person to fifty percent (50%) or more of the combined voting power of all of the then outstanding Voting Securities; provided, however, that if any person referred to in this sentence shall thereafter become the beneficial owner of any additional shares of Voting Securities (other than pursuant to a stock split, stock dividend, or similar transaction or as a result of an acquisition of securities directly from the Company) and immediately thereafter beneficially owns fifty percent (50%) or more of the combined voting power of all of the then outstanding Voting Securities, then a “Change in Control” shall be deemed to have occurred for purposes of this letter agreement. Further, and solely to the extent necessary to comply with Section 409A of the Code, such event must constitute a “change in control” within the meaning of Treasury Regulation Section 1.409A-3(i)(5) in order for the payments and benefits hereunder to become payable.

g. If your employment terminates because of your death or Disability, then you will receive the Accrued Benefits. For purposes of this letter agreement, “Disability” shall be defined as your inability to have performed your material duties hereunder due to a physical or mental injury, infirmity or incapacity for one hundred eighty (180) days (including weekends and holidays) in any 365-day period.

h. For purposes of this letter agreement, “Cause” shall mean: (i) dishonesty, embezzlement, misappropriation of assets or property of the Company; (ii) gross negligence, willful misconduct, neglect of duties, theft, fraud or breach of fiduciary duty to the Company; (iii) violation of federal or state securities law; (iv) the conviction of a felony or any crime involving moral turpitude, including a plea of guilty or nolo contendre; (v) a material breach of any of the Company’s written policies related to conduct or ethics; or (vi) a material breach of the Nondisclosure and Inventions Assignment Agreement, dated October 22, 2010, between you and the Company (the “ConfidentialityAgreement”).

  1. Employee Confidentiality Agreement. As an employee of the Company, you will continue to have access to certain Company and third-party confidential information, and you may during the course of your employment develop certain information or inventions which will be the property of the Company. You acknowledge the continuing effectiveness of the Confidentiality Agreement, and you further acknowledge that the changes to your responsibilities, duties, compensation, and title, as contemplated by this letter agreement (and which may occur hereafter), do not nullify or otherwise alter your obligations under the Confidentiality Agreement, which remain in full force and effect.

  2. Equity Forfeiture and Vesting. Effective as of the Effective Date, you hereby agree to, and do, fully and irrevocably surrender all right, title and interest in the portions of the equity awards set forth on Exhibit B to this letter agreement. Any equity awards that are outstanding on the date hereof and that you continue to hold following such surrender are herein referred to as the “Remaining Equity Awards.” Your Remaining Equity Awards will continue to vest, become exercisable and free from early termination or forfeiture in accordance with their existing terms, provided that if the Company terminates your employment without Cause or you resign for Good Reason on or prior to March 1, 2025, then any of the remaining unvested portions of your Remaining Equity Awards will, subject to your execution of, and the effectiveness of, the Release required by Section 5 of this letter agreement, become vested,

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exercisable and free from early termination or forfeiture and, if such awards are stock options, will remain exercisable until the earlier of (x) March 1, 2026, and (y) the expiration date of such stock option.

  1. Resolution of Disputes. Any controversy or claim arising out of or relating to your employment, this letter agreement, its enforcement or interpretation, or because of an alleged breach, default, or misrepresentation in connection with any of its provisions, shall be submitted to arbitration in Boston, Massachusetts before a single arbitrator (applying Massachusetts law), in accordance with the National Rules for the Resolution of Employment Disputes then in effect of the American Arbitration Association (“AAA”) as modified by the terms and conditions of this Section 8; provided, however, that provisional injunctive relief may, but need not, be sought in a court of law while arbitration proceedings are pending, and any provisional injunctive relief granted by such court shall remain effective until the matter is finally determined by the arbitrator. The arbitrator shall be selected by mutual agreement of the parties or, if the parties cannot agree, by striking from a list of arbitrators supplied by AAA. The arbitrator shall issue a written opinion revealing, however briefly, the essential findings and conclusions upon which the award is based. Final resolution of any dispute through arbitration may include any remedy or relief which the arbitrator deems just and equitable. Any award or relief granted by the arbitrator hereunder shall be final and binding on the parties hereto and may be enforced by any court of competent jurisdiction.

The parties acknowledge that they are hereby waiving any rights to trial by jury in any action, proceeding or counterclaim brought by either of the parties against the other in connection with any matter whatsoever arising out of or in any way connected with this letter agreement or your employment.

The Company shall pay the arbitrator’s fees and arbitration expenses and any other costs associated with the arbitration or arbitration hearing that are unique to arbitration. The Company and you each shall separately pay its or your own deposition, witness, expert and attorneys’ fees and other expenses as and to the same extent as if the matter were being held in court unless otherwise provided by law. The arbitrator shall have the sole and exclusive power and authority to decide any and all issues of or related to whether this letter agreement or any provision of this letter agreement is subject to arbitration.

  1. Attorneys’ Fees. The Company shall reimburse you for your reasonable attorneys’ fees incurred in connection with the negotiation of this letter agreement.

  2. No Inconsistent Obligations. By accepting this offer of employment, you represent and warrant to the Company that you are under no obligations or commitments, whether contractual or otherwise, that are inconsistent with your obligations set forth in this letter agreement or that would be violated by your employment by the Company. You agree that you will not take any action on behalf of the Company or cause the Company to take any action that will violate any agreement that you have with a prior employer.

  3. Indemnification and Liability Insurance. The Company will provide you certain rights to indemnification as set forth in the Company’s standard form of indemnification agreement for executive officers and directors.

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  1. Observer. As of the Effective Date and through no earlier than the second anniversary of the Transition Date, the Company shall invite you to attend all meetings of the Board in a nonvoting observer capacity and, in this respect, shall give you copies of all notices, minutes, consents, and other materials that it provides to its directors; provided, however, that you shall agree to hold in confidence all information so provided; and provided further, that the Company reserves the right to withhold any information and to exclude you from any meeting or portion thereof if access to such information or attendance at such meeting could adversely affect the attorney-client privilege between the Company and its counsel, result in disclosure of trade secrets, result in or relates to a matter with respect to which you have a conflict of interest, or if the Board reasonably determines that you are (or are associated with) a competitor of the Company. You shall not be entitled to attend executive session portions of Board meetings.

  2. Miscellaneous.

a. This letter agreement may be executed in several counterparts, each of which shall be deemed to be an original but all of which together will constitute one and the same instrument.

b. The Company may only assign this letter agreement to a successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business and/or assets of the Company, provided, that such successor expressly agrees to assume and perform this letter agreement in the same manner and to the same extent that the Company would have been required to perform it if no such assignment had taken place, and “Company” shall include any such successor that assumes and agrees to perform this letter agreement, by operation of law or otherwise.

c. No provision of this letter agreement may be modified, waived or discharged unless such waiver, modification or discharge is agreed to in writing and signed by you and such officer or director as may be designated by the Board. No waiver by either party hereto at any time of any breach by the other party hereto of, or compliance with, any condition or provision of this letter agreement to be performed by such other party shall be deemed a waiver of similar or dissimilar provisions or conditions at the same or at any prior or subsequent time. The validity, interpretation, construction and performance of this letter agreement shall be governed by the laws of the Commonwealth of Massachusetts without regard to the choice of law principles thereof.

If you have any further questions or require additional information, please feel free to contact me.

[Signatures appear on following page]

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Sincerely,

Signature: /s/ Michael Mano
Michael Mano
Senior Vice President and General Counsel, Karyopharm Therapeutics
Date: April 28, 2021
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The foregoing correctly sets forth the terms of my employment by Karyopharm Therapeutics Inc. I am not relying on any representations pertaining to my employment other than those set forth above.

Signature: /s/ Sharon Shacham
Printed Name: Sharon Shacham, Ph.D., M.B.A.
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Date: April 28, 2021
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EXECUTION VERSION

Exhibit A

You may (i) engage in charitable, civic, educational, professional, community or industry affairs; (ii) serve on the boards of directors or advisory boards of other companies; and/or (iii) subject to written approval from the Nominating and Governance Committee, serve as a part-time employee or consultant for another company, so long as all such activities in this Exhibit A, either individually and/or in the aggregate, do not (x) materially detract from your ability to perform your duties; or (ii) violate your obligations pursuant to the Confidentiality Agreement.

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Exhibit B

Name GrantNumber Grant Date ExercisePrice Outstanding asof the EffectiveDate Options to beForfeitedUnderAgreement RemainingEquity Awards
Sharon Shacham I000140 12/18/2013 $ 23.66 16,904 16,904
Sharon Shacham N000140 12/18/2013 $ 23.66 123,096 90,000 33,096
Sharon Shacham I000234 1/19/2015 $ 26.65 7,504 7,504
Sharon Shacham N000234 1/19/2015 $ 26.65 192,496 192,496
Total **** 340,000 **** 290,000 **** 50,000