CURI · CuriosityStream Inc.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.525 to $2.598, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

Shares were sold for tax planning purposes.

The reporting person is trustee of the trust, and the reporting person is the sole beneficiary of the trust. The reporting person remains the beneficial owner of the securities held by the trust.

On June 12, 2026, the Company purchased 31,559 shares directly from Mr. Keeley under the Company's share repurchase program. The per-share price was based on a five-day volume-weighted average price calculated as of the transaction date in a transaction approved by the Audit Committee of the Company's Board of Directors.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.75 to $2.78, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.68 to $2.775, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.59 to $2.70, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote to this Form 4.

Represents the withholding of shares of the Company's common stock for tax purposes in connection with the vesting of restricted stock units previously granted

On July 15, 2025, the Company granted Mr. Stinchcomb 2,400,000 restricted stock units (RSUs) with tandem dividend equivalent rights under the 2020 Omnibus Incentive Plan. Each RSU represents the right to receive one share of common stock. The RSUs granted are performance-based, subject to the Company achieving certain stock price or financial performance goals. All vesting is subject to continued employment on the applicable vesting date and any RSUs not earned during the term of Mr. Stinchcomb's employment agreement ("Agreement") will be cancelled. The dividend equivalents rights entitle Mr. Stinchcomb to payout of dividends accrued on each unvested RSU to the extent such RSUs vest and are distributed under the Agreement.

On March 10, 2026, the Board determined that the Company met the second performance condition of the award by achieving 40% revenue growth and 35% adjusted free cash flow growth for the full year 2025 compared to 2024, and thereby triggering the vesting of the second tranche of the Award, or 600,000 RSUs.

On July 15, 2025, the Company granted Mr. Stinchcomb 2,400,000 restricted stock units (RSUs) with tandem dividend equivalent rights under the 2020 Omnibus Incentive Plan. Each RSU represents the right to receive one share of common stock. The RSUs granted are performance-based, subject to the Company achieving certain stock price or financial performance goals. All vesting is subject to continued employment on the applicable vesting date and any RSUs not earned during the term of Mr. Stinchcomb's employment agreement ("Agreement") will be cancelled. The dividend equivalents rights entitle Mr. Stinchcomb to payout of dividends accrued on each unvested RSU to the extent such RSUs vest and are distributed under the Agreement.

On March 10, 2026, the Board determined that the Company met the second performance condition of the award by achieving 40% revenue growth and 35% adjusted free cash flow growth for the full year 2025 compared to 2024, and thereby triggering the vesting of the second tranche of the Award, or 600,000 RSUs.

On February 10, 2026, the Company granted Mr. Hayden 30,000 restricted stock units (RSUs) with tandem dividend equivalent rights under the Company's 2020 Omnibus Incentive Plan. The RSUs will vest in four tranches of 7,500 each on the first, second, third and fourth anniversaries of the grant date. Each RSU represents the right to receive one share of common stock and will be settled upon vesting (or within 30 days thereafter). All vesting events are subject to continued employment on each applicable vesting date.

On February 10, 2026, the Company granted Ms. Reed 30,000 restricted stock units (RSUs) with tandem dividend equivalent rights under the Company's 2020 Omnibus Incentive Plan. The RSUs will vest in four tranches of 7,500 each on the first, second, third and fourth anniversaries of the grant date. Each RSU represents the right to receive one share of common stock and will be settled upon vesting (or within 30 days thereafter). All vesting events are subject to continued employment on each applicable vesting date.

On February 10, 2026, the Company granted Mr. Vilade 150,000 restricted stock units (RSUs) with tandem dividend equivalent rights under the Company's 2020 Omnibus Incentive Plan. The RSUs granted will vest in four tranches of 37,500 each upon the date the Board of Directors determines that the applicable performance condition has been achieved: (i) the Company's common stock achieves a 10-day Volume Weighted Average Price (VWAP) of $6.50 or achievement of 2026 Company annual bonus plan targets (at 100%); (ii) the common stock achieves a 10-day VWAP of $7.50 or achievement of 2027 Company annual bonus plan targets (at 100%); (iii) the common stock achieves a 10-day VWAP of $9.50 or achievement of 2028 Company annual bonus plan targets (at 100%); and (iv) the common stock achieves a 10-day VWAP of $11.50 or achievement of 2029 Company annual bonus plan targets (at 100%). Any RSUs not earned by January 31, 2030, will be cancelled.

Each RSU represents the right to receive one share of common stock and will be settled upon vesting (or within 30 days thereafter). All vesting events are subject to continued employment on each applicable vesting date.

Each RSU represents the right to receive one share of common stock and will be settled upon vesting (or within 30 days thereafter). All vesting events are subject to continued employment on each applicable vesting date.

On February 10, 2026, the Company granted Mr. Vilade 100,000 RSUs with tandem dividend equivalent rights under the Company's 2020 Omnibus Incentive Plan. The RSUs will vest in four tranches of 25,000 each on the first, second, third and fourth anniversaries of the grant date.

On February 4, 2026, 38,500 restricted stock units previously granted to Mr. Nikzad under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis

On February 4, 2026, 37,000 restricted stock units previously granted to Mr. Blank under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis.

On February 4, 2026, 43,750 restricted stock units previously granted to Mr. Keeley under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis

On February 4, 2026, 38,500 restricted stock units previously granted to Mr. Nikzad under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis

On February 4, 2026, 38,500 restricted stock units previously granted to Ms. Saravia under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis.

On February 4, 2026, 38,500 restricted stock units previously granted to Ms. Saravia under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis.

On Feb 4, 2026 the Company granted Mr. Huberman 21,341 restricted stock units under the Plan. Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock units granted will vest on Feb 4, 2027, and will be settled upon vesting (or within 30 days thereafter).

On February 4, 2026, 43,750 restricted stock units previously granted to Mr. Huberman under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis.

On Feb 4, 2026 the Company granted Mr. Nikzad 18,780 restricted stock units under the Plan. Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock units granted will vest on Feb 4, 2027, and will be settled upon vesting (or within 30 days thereafter).

On Feb 4, 2026 the Company granted Mr. Blank 18,049 restricted stock units under the Plan. Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock units granted will vest on Feb 4, 2027, and will be settled upon vesting (or within 30 days thereafter).

On February 4, 2026, 37,000 restricted stock units previously granted to Mr. Blank under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis.

On February 4, 2026, 38,500 restricted stock units previously granted to Mr. Hendricks under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis.

On February 4, 2026, 38,500 restricted stock units previously granted to Mr. Hendricks under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis.

On February 4, 2026, 43,750 restricted stock units previously granted to Mr. Huberman under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis.

On Feb 4, 2026 the Company granted Ms. Saravia 18,780 restricted stock units under the Plan. Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock units granted will vest on Feb 4, 2027, and will be settled upon vesting (or within 30 days thereafter).

On Feb 4, 2026 the Company granted Mr. Hendricks 27,439 restricted stock units under the Company's 2020 Omnibus Incentive Plan. Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock units granted will vest on Feb 4, 2027, and will be settled upon vesting (or within 30 days thereafter).

On February 4, 2026, 43,750 restricted stock units previously granted to Mr. Keeley under the Company's 2020 Omnibus Incentive Plan (the "Plan") vested and converted into shares of the Company's common stock on a one-for-one basis

On Feb 4, 2026 the Company granted Mr. Keeley 21,341 restricted stock units under the Plan. Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock units granted will vest on Feb 4, 2027, and will be settled upon vesting (or within 30 days thereafter).

On Feb 4, 2026 the Company granted Mr. Hendricks 18,780 restricted stock units under the Plan. Each restricted stock unit represents a contingent right to receive one share of common stock. The restricted stock units granted will vest on Feb 4, 2027, and will be settled upon vesting (or within 30 days thereafter).

Shares sold pursuant to a 10b5-1 plan which Mr. Hayden entered into on May 30, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.73 to $3.81, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

The reporting person is trustee of the trust, and the reporting person is the sole beneficiary of the trust. The reporting person remains the beneficial owner of the securities held by the trust.

Shares sold pursuant to a 10b5-1 plan which Mr. Hayden entered into on May 30, 2025.

The reporting person is trustee of the trust, and the reporting person is the sole beneficiary of the trust. The reporting person remains the beneficial owner of the securities held by the trust.

Shares sold pursuant to a 10b5-1 plan which Ms. Cudahy entered into on August 13, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.97 to $4.99, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

Sales were made for estate and tax planning purposes.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.60 to $4.70, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

Sales were made for estate and tax planning purposes.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.60 to $4.735, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

Sales were made for estate and tax planning purposes.

Shares sold pursuant to a 10b5-1 plan which Mr. Huberman entered into on August 13, 2025.

Mr. Huberman holds these securities indirectly as the reporting person and managing member of 211 LV LLC and may be deemed to share beneficial ownership of the securities held directly by 211 LV LLC, and disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

Sales were made for estate and tax planning purposes.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.90 to $4.98, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

Shares sold pursuant to a 10b5-1 plan which Ms. Cudahy entered into on August 13, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.97 to $5.00, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

Shares sold pursuant to a 10b5-1 plan which Mr. Hayden entered into on May 30, 2025.

The reporting person is trustee of the trust, and the reporting person is the sole beneficiary of the trust. The reporting person remains the beneficial owner of the securities held by the trust.

Shares sold pursuant to a 10b5-1 plan which Mr. Huberman entered into on August 13, 2025.

Mr. Huberman holds these securities indirectly as the reporting person and managing member of 211 LV LLC and may be deemed to share beneficial ownership of the securities held directly by 211 LV LLC, and disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

Shares sold pursuant to a 10b5-1 plan which Ms. Cudahy entered into on August 13, 2025.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.97 to $5.00, inclusive. The reporting person undertakes to provide to CuriosityStream Inc., any security holder of CuriosityStream Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

Reflects the exempt transfer of 101,667 shares from Mr. Hayden to P. Brady Hayden Revocable Trust on November 12, 2025 for no consideration. The reporting person is trustee of the trust, and the reporting person is the sole beneficiary of the trust. The reporting person remains the beneficial owner of the securities held by the trust.

Reflects the exempt transfer of 101,667 shares from Mr. Hayden to P. Brady Hayden Revocable Trust on November 12, 2025 for no consideration. The reporting person is trustee of the trust, and the reporting person is the sole beneficiary of the trust. The reporting person remains the beneficial owner of the securities held by the trust.

On October 9, 2024, the Company granted Clinton Stinchcomb 905,000 performance-based restricted stock units ("RSUs") under the 2020 Omnibus Incentive Plan (the "Award"). Each RSU represents a contingent right to receive one share of common stock. On May 7, 2025, the Board determined that the Company met the first performance condition of the Award, for having then achieved more than $4,500,000 in adjusted free cash flow since October 1, 2024, and thereby triggering the vesting of one-third of the Award, or 301,667 RSUs. On November 11, 2025, the Board determined that the Company met the second performance condition of the Award, by achieving more than $9,000,000 in adjusted free cash flow between October 1, 2024 and September 30, 2025, and thereby triggering the vesting of two-thirds of the Award, or 603,333 RSUs.

Represents the withholding of shares of the Company's common stock for tax purposes in connection with the vesting of restricted stock units previously granted.

On October 9, 2024, the Company granted Clinton Stinchcomb 905,000 performance-based restricted stock units ("RSUs") under the 2020 Omnibus Incentive Plan (the "Award"). Each RSU represents a contingent right to receive one share of common stock. On May 7, 2025, the Board determined that the Company met the first performance condition of the Award, for having then achieved more than $4,500,000 in adjusted free cash flow since October 1, 2024, and thereby triggering the vesting of one-third of the Award, or 301,667 RSUs. On November 11, 2025, the Board determined that the Company met the second performance condition of the Award, by achieving more than $9,000,000 in adjusted free cash flow between October 1, 2024 and September 30, 2025, and thereby triggering the vesting of two-thirds of the Award, or 603,333 RSUs.

On October 9, 2024, the Company granted Rebecca Reed 40,000 performance-based restricted stock units ("RSUs") under the 2020 Omnibus Incentive Plan (the "Award"). Each RSU represents a contingent right to receive one share of common stock. On May 7, 2025, the Board determined that the Company met the first performance condition of the Award, for having then achieved more than $4,500,000 in adjusted free cash flow since October 1, 2024, and thereby triggering the vesting of one-third of the Award, or 13,333 RSUs. On November 11, 2025, the Board determined that the Company met the second performance condition of the Award, by achieving more than $9,000,000 in adjusted free cash flow between October 1, 2024 and September 30, 2025, and thereby triggering the vesting of two-thirds of the Award, or 26,667 RSUs.

Represents the withholding of shares of the Company's common stock for tax purposes in connection with the vesting of restricted stock units previously granted.