ATYR · aTYR PHARMA INC

Represents weighted average price for the shares. The shares were purchased at prices ranging from $0.4907 to $0.50 per share. The Reporting Person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

These shares are owned directly by Schimmel Revocable Trust U/A Dtd 9/6/2000. The Reporting Person and his spouse are trustees of the Schimmel Revocable Trust U/A Dtd 9/6/2000.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 11, 2027 or (ii) the Issuer's 2027 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 11, 2027 or (ii) the Issuer's 2027 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 11, 2027 or (ii) the Issuer's 2027 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 11, 2027 or (ii) the Issuer's 2027 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 11, 2027 or (ii) the Issuer's 2027 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 11, 2027 or (ii) the Issuer's 2027 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

Sale made by the Reporting Person to satisfy tax withholding obligations in connection with the partial vesting of RSUs granted on February 3, 2022.

Sale made by the Reporting Person to satisfy tax withholding obligations in connection with the partial vesting of RSUs granted on February 3, 2022.

Sale made by the Reporting Person to satisfy tax withholding obligations in connection with the partial vesting of RSUs granted on February 3, 2022.

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

The RSUs vest in four equal annual installments beginning on February 3, 2023, such that the RSUs fully vest on February 3, 2026. The RSUs are subject to accelerated vesting upon termination without cause upon a change of control of the Issuer.

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

The RSUs vest in four equal annual installments beginning on February 3, 2023, such that the RSUs fully vest on February 3, 2026. The RSUs are subject to accelerated vesting upon termination without cause upon a change of control of the Issuer.

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

The RSUs vest in four equal annual installments beginning on February 3, 2023, such that the RSUs fully vest on February 3, 2026. The RSUs are subject to accelerated vesting upon termination without cause upon a change of control of the Issuer.

Represents shares acquired upon the vesting of restricted stock units (RSUs) granted to the Reporting Person on February 3, 2022.

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

Represents shares acquired upon the vesting of restricted stock units (RSUs) granted to the Reporting Person on February 3, 2022.

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

Represents shares acquired upon the vesting of restricted stock units (RSUs) granted to the Reporting Person on February 3, 2022.

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

The shares subject to this option shall vest and become exercisable in 36 equal monthly installments beginning February 9, 2026, such that this option will be fully exercisable on January 9, 2029. This option is subject to accelerated vesting upon termination without cause upon change of control of the issuer.

The shares subject to this option shall vest and become exercisable in 36 equal monthly installments beginning February 9, 2026, such that this option will be fully exercisable on January 9, 2029. This option is subject to accelerated vesting upon termination without cause upon change of control of the issuer.

The shares subject to this option shall vest and become exercisable in 36 equal monthly installments beginning February 9, 2026, such that this option will be fully exercisable on January 9, 2029. This option is subject to accelerated vesting upon termination without cause upon change of control of the issuer.

Represents weighted average price for the shares. The shares were purchased at prices ranging from $0.93 to $0.95 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

These shares are owned directly by Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel. The Reporting Person is the sole owner of the Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel.

Represents weighted average price for the shares. The shares were purchased at prices ranging from $0.8536 to $0.95 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

These shares are owned directly by Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel. The Reporting Person is the sole owner of the Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 1, 2026 or (ii) the Issuer's 2026 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 1, 2026 or (ii) the Issuer's 2026 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 1, 2026 or (ii) the Issuer's 2026 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 1, 2026 or (ii) the Issuer's 2026 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 1, 2026 or (ii) the Issuer's 2026 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 1, 2026 or (ii) the Issuer's 2026 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

Sale made by the Reporting Person to satisfy tax withholding obligations in connection with the partial vesting of RSUs granted on February 3, 2022.

Sale made by the Reporting Person to satisfy tax withholding obligations in connection with the partial vesting of RSUs granted on February 3, 2022.

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

The RSUs vest in four equal annual installments beginning on February 3, 2023, such that the RSUs will fully vest on February 3, 2026. The RSUs are subject to accelerated vesting upon termination without cause upon a change of control of the Issuer.

Represents shares acquired upon the vesting of restricted stock units (RSUs) granted to the Reporting Person on February 3, 2022.

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 RSUs vest in four equal annual installments beginning on February 3, 2023, such that the RSUs will fully vest on February 3, 2026. The RSUs are subject to accelerated vesting upon termination without cause upon a change of control of the Issuer.

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

The RSUs vest in four equal annual installments beginning on February 3, 2023, such that the RSUs will fully vest on February 3, 2026. The RSUs are subject to accelerated vesting upon termination without cause upon a change of control of the Issuer.

Represents shares acquired upon the vesting of restricted stock units (RSUs) granted to the Reporting Person on February 3, 2022.

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

Includes 2,500 shares acquired on November 15, 2024 under the Company's 2015 Employee Purchase Plan.

Represents shares acquired upon the vesting of restricted stock units (RSUs) granted to the Reporting Person on February 3, 2022.

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

Includes 1,307 shares acquired on November 15, 2024 under the Company's 2015 Employee Purchase Plan.

The shares subject to this option shall vest and become exercisable in 48 equal monthly installments beginning February 8, 2025, such that this option will be fully exercisable on January 8, 2029. This option is subject to accelerated vesting upon termination without cause upon change of control of the issuer.

The shares subject to this option shall vest and become exercisable in 48 equal monthly installments beginning February 8, 2025, such that this option will be fully exercisable on January 8, 2029. This option is subject to accelerated vesting upon termination without cause upon change of control of the issuer.

The shares subject to this option shall vest and become exercisable in 48 equal monthly installments beginning February 8, 2025, such that this option will be fully exercisable on January 8, 2029. This option is subject to accelerated vesting upon termination without cause upon change of control of the issuer.

The shares subject to this option shall vest and become exercisable in 36 equal monthly installments beginning January 10, 2025, such that this option will be fully exercisable on December 10, 2027, subject to the recipient's continued service on the Issuer's Board of Directors.

Represents weighted average price for the shares. The shares were purchased at prices ranging from $1.88 to $1.96 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

These shares are owned by Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel. The Reporting Person is the sole owner of the Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel.

Represents weighted average price for the shares. The shares were purchased at prices ranging from $1.775 to $1.86 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

These shares are owned by Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel. The Reporting Person is the sole owner of the Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel.

Represents weighted average price for the shares. The shares were purchased at prices ranging from $1.71 to $1.78 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

These shares are owned by Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel. The Reporting Person is the sole owner of the Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel.

Represents weighted average price for the shares. The shares were purchased at prices ranging from $1.835 to $1.87 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

Includes 2,500 shares acquired on May 15, 2024 under the Company's 2015 Employee Purchase Plan.

Represents weighted average price for the shares. The shares were purchased at prices ranging from $1.77 to $1.86 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

Includes 2,139 shares acquired on May 15, 2024 under the Company's 2015 Employee Purchase Plan.

Represents weighted average price for the shares. The shares were purchased at prices ranging from $1.665 to $1.80 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price.

These shares are owned by the Coughlin Family Trust u/a DTD 12/07/2006. The Reporting Person and his spouse serve as co-trustees of the Coughlin Family Trust u/a DTD 12/07/2006. The Reporting Person may be deemed to be the beneficial owner of the securities held by the Coughlin Family Trust u/a DTD 12/07/2006.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 22, 2025 or (ii) the Issuer's 2025 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 22, 2025 or (ii) the Issuer's 2025 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.

The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 22, 2025 or (ii) the Issuer's 2025 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors.