FDMT · 4D Molecular Therapeutics, Inc.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on January 9, 2026.

The transaction was executed in multiple trades in prices ranging from $11.575 to $12.49, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on January 9, 2026.

The transaction was executed in multiple trades in prices ranging from $12.82 to $12.88, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on January 9, 2026.

The transaction was executed in multiple trades in prices ranging from $12.68 to $13.23, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of March 6, 2025 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of June 16, 2022 (the "Vesting Commencement Date") such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on January 13, 2026.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of March 6, 2025 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

Reflects 5,023 shares of the Issuer's common stock purchased under the Issuer's Employee Stock Purchase Plan in a transaction exempt under Rule 16b-3.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on January 9, 2026.

The transaction was executed in multiple trades in prices ranging from $10.00 to $10.87, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Automatically granted pursuant to the terms of the Company's non-employee director compensation program.

The stock option vests and becomes exercisable with respect to 1/3 of the total shares on June 17, 2027 and in equal monthly installments thereafter, subject to the Reporting Person continuing service to Issuer through each vesting date, until the shares are fully vested on June 17, 2029. Additionally, the stock options will vest in full upon the consummation of a Change in Control (as defined in the 2020 Incentive Award Plan).

Automatically granted pursuant to the terms of the Company's non-employee director compensation program.

The stock option vests and becomes exercisable with respect to 1/3 of the total shares on June 17, 2027 and in equal monthly installments thereafter, subject to the Reporting Person continuing service to Issuer through each vesting date, until the shares are fully vested on June 17, 2029. Additionally, the stock options will vest in full upon the consummation of a Change in Control (as defined in the 2020 Incentive Award Plan).

Automatically granted pursuant to the terms of the Company's non-employee director compensation program.

The stock option vests and becomes exercisable with respect to 1/3 of the total shares on June 17, 2027 and in equal monthly installments thereafter, subject to the Reporting Person continuing service to Issuer through each vesting date, until the shares are fully vested on June 17, 2029. Additionally, the stock options will vest in full upon the consummation of a Change in Control (as defined in the 2020 Incentive Award Plan).

Automatically granted pursuant to the terms of the Company's non-employee director compensation program.

The stock option vests and becomes exercisable with respect to 1/3 of the total shares on June 17, 2027 and in equal monthly installments thereafter, subject to the Reporting Person continuing service to Issuer through each vesting date, until the shares are fully vested on June 17, 2029. Additionally, the stock options will vest in full upon the consummation of a Change in Control (as defined in the 2020 Incentive Award Plan).

Automatically granted pursuant to the terms of the Company's non-employee director compensation program.

The stock option vests and becomes exercisable with respect to 1/3 of the total shares on June 17, 2027 and in equal monthly installments thereafter, subject to the Reporting Person continuing service to Issuer through each vesting date, until the shares are fully vested on June 17, 2029. Additionally, the stock options will vest in full upon the consummation of a Change in Control (as defined in the 2020 Incentive Award Plan).

Automatically granted pursuant to the terms of the Company's non-employee director compensation program.

The stock option vests and becomes exercisable with respect to 1/3 of the total shares on June 17, 2027 and in equal monthly installments thereafter, subject to the Reporting Person continuing service to Issuer through each vesting date, until the shares are fully vested on June 17, 2029. Additionally, the stock options will vest in full upon the consummation of a Change in Control (as defined in the 2020 Incentive Award Plan).

Automatically granted pursuant to the terms of the Company's non-employee director compensation program.

The stock option vests and becomes exercisable with respect to 1/3 of the total shares on June 17, 2027 and in equal monthly installments thereafter, subject to the Reporting Person continuing service to Issuer through each vesting date, until the shares are fully vested on June 17, 2029. Additionally, the stock options will vest in full upon the consummation of a Change in Control (as defined in the 2020 Incentive Award Plan).

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on January 9, 2026.

The transaction was executed in multiple trades in prices ranging from $10.00 to $10.055, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The reporting person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of March 25, 2026 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of March 25, 2026 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of March 25, 2026 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

The transaction represents an automatic sale to satisfy the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.

Restricted Stock Units convert into common stock on a one-for-one basis.

Restricted Stock Units convert into common stock on a one-for-one basis.

Restricted Stock Units convert into common stock on a one-for-one basis.

The shares underlying the restricted stock unit award shall vest as to 1/16th of the shares on June 20, 2025 and as to 1/16th of the underlying shares on each quarterly anniversary of such date thereafter, while the grantee remains a service provider to the Company.

Restricted Stock Units convert into common stock on a one-for-one basis.

The shares underlying the restricted stock unit award shall vest as to 25% of the shares on June 20, 2025 and as to 1/16th of the underlying shares on each quarterly anniversary of such date thereafter, while the grantee remains a service provider to the Company.

The transaction represents an automatic sale to satisfy the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.

One-third of the shares subject to the option vest on the first anniversary measured from January 5 2026 (the "Vesting Commencement Date"), and 1/36th of the total number of shares vest in twenty-four (24) successive and equal monthly installments thereafter, such that 100% of the shares subject to the option will be fully vested and exercisable on the third anniversary of the Vesting Commencement Date.

Restricted Stock Units convert into common stock on a one-for-one basis.

Restricted Stock Units convert into common stock on a one-for-one basis.

The shares underlying the restricted stock unit award shall vest as to 1/16th of the shares on June 20, 2025 and as to 1/16th of the underlying shares on each quarterly anniversary of such date thereafter, while the grantee remains a service provider to the Company.

The transaction represents an automatic sale to satisfy the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.

Restricted Stock Units convert into common stock on a one-for-one basis.

The transaction represents an automatic sale to satisfy the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.

Restricted Stock Units convert into common stock on a one-for-one basis.

The shares underlying the restricted stock unit award shall vest as to 25% of the shares on June 20, 2025 and as to 1/16th of the underlying shares on each quarterly anniversary of such date thereafter, while the grantee remains a service provider to the Company.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on June 6, 2025.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of March 6, 2025 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

Fully vested.

25% of the shares subject to the stock option vest on the first anniversary measured from November 17, 2025 (the "Vesting Commencement Date"), and 1/48th of the total number of shares vest in thirty-six (36) successive and equal monthly installments thereafter, such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on June 6, 2025.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of March 6, 2025 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on June 6, 2025.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on June 6, 2025.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on June 6, 2025.

The shares underlying the stock option award shall vest and become exercisable as to 1/48th of the underlying shares on each monthly anniversary of June 16, 2022 (the "Vesting Commencement Date") such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date, while the grantee remains a service provider to the Company.

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person on June 6, 2025.