VXRT · Vaxart, Inc.

The shares subject to this option shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary of the date of the grant.

The shares subject to this option shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary of the date of the grant.

Grant of shares upon vesting of restricted stock units. The shares underlying the award shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary date of the grant.

Grant of shares upon vesting of restricted stock units. The shares underlying the award shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary date of the grant.

Grant of shares upon vesting of restricted stock units. The shares underlying the award shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary date of the grant.

Grant of shares upon vesting of restricted stock units. The shares underlying the award shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary date of the grant.

The shares subject to this option shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary of the date of the grant.

The shares subject to this option shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary of the date of the grant.

The shares subject to this option shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary of the date of the grant.

Grant of shares upon vesting of restricted stock units. The shares underlying the award shall vest on the earlier of the date immediately prior of the 2027 annual meeting of stockholders of the Issuer and July 16, 2027, the first anniversary date of the grant.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of May 19, 2026.

Grant of shares upon vesting of restricted stock units. The shares underlying the award shall vest in equal installments on each of the first three anniversaries of the grant date, subject to the reporting person's continuing service on the Board of Directors (the "Board").

The shares subject to this option shall vest in equal installments on each of the first three anniversaries of the grant date, subject to the reporting person's continuing service on the Board.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 28, 2026.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 28, 2026.

This amount includes 75,618 shares acquired under the Vaxart, Inc. 2022 Employee Stock Purchase Plan.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 24, 2026.

This amount includes 75,618 shares acquired under the Vaxart, Inc. 2022 Employee Stock Purchase Plan.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 24, 2026.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 24, 2026.

This amount includes 70,781 shares acquired under the Vaxart, Inc. 2022 Employee Stock Purchase Plan.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 24, 2026.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 18, 2026.

This amount includes 75,618 shares acquired under the Vaxart, Inc. 2022 Employee Stock Purchase Plan.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 18, 2026.

This amount includes 70,781 shares acquired under the Vaxart, Inc. 2022 Employee Stock Purchase Plan.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 18, 2026.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of March 18, 2026.

Grant of shares upon vesting of restricted stock units. 25% of the shares underlying the award shall vest on each anniversary of the vesting commencement date of March 16, 2026, so that the restricted stock units would be fully vested on the fourth anniversary of the vesting commencement date.

The shares subject to this stock option shall vest as to 25% of the shares underlying the grant on March 16, 2027, the first anniversary of the date that vesting commenced, and thereafter in 36 equal monthly installments such that the stock option shall be fully vested on March 16, 2030.

The shares subject to this stock option shall vest as to 25% of the shares underlying the grant on March 16, 2027, the first anniversary of the date that vesting commenced, and thereafter in 36 equal monthly installments such that the stock option shall be fully vested on March 16, 2030.

Grant of shares upon vesting of restricted stock units. 25% of the shares underlying the award shall vest on each anniversary of the vesting commencement date of March 16, 2026, so that the restricted stock units would be fully vested on the fourth anniversary of the vesting commencement date.

Grant of shares upon vesting of restricted stock units. 25% of the shares underlying the award shall vest on each anniversary of the vesting commencement date of March 16, 2026, so that the restricted stock units would be fully vested on the fourth anniversary of the vesting commencement date.

The shares subject to this stock option shall vest as to 25% of the shares underlying the grant on March 16, 2027, the first anniversary of the date that vesting commenced, and thereafter in 36 equal monthly installments such that the stock option shall be fully vested on March 16, 2030.

Grant of shares upon vesting of restricted stock units. 25% of the shares underlying the award shall vest on each anniversary of the vesting commencement date of March 16, 2026, so that the restricted stock units would be fully vested on the fourth anniversary of the vesting commencement date.

Grant of shares upon vesting of restricted stock units. 25% of the shares underlying the award shall vest on each anniversary of the vesting commencement date of March 16, 2026, so that the restricted stock units would be fully vested on the fourth anniversary of the vesting commencement date.

The shares subject to this stock option shall vest as to 25% of the shares underlying the grant on March 16, 2027, the first anniversary of the date that vesting commenced, and thereafter in 36 equal monthly installments such that the stock option shall be fully vested on March 16, 2030.

The shares subject to this stock option shall vest as to 25% of the shares underlying the grant on March 16, 2027, the first anniversary of the date that vesting commenced, and thereafter in 36 equal monthly installments such that the stock option shall be fully vested on March 16, 2030.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of February 2, 2026.

This amount includes 70,781 shares acquired under the Vaxart, Inc. 2022 Employee Stock Purchase Plan.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of February 2, 2026.

This amount includes 75,618 shares acquired under the Vaxart, Inc. 2022 Employee Stock Purchase Plan.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of February 2, 2026.

Grant of shares upon vesting of restricted stock units, which fully vested on December 4, 2025.

This amount includes 57,723 shares acquired under the Vaxart, Inc. 2022 Employee Stock Purchase Plan.

Represents shares that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs vested as of December 4, 2025.

This Form 4 is being filed late due to delays in receiving EDGAR access codes.

This Form 4 is being filed late due to delays in receiving EDGAR access codes.

This transaction is being reported late due to an administrative oversight.

This transaction is being reported late due to an administrative oversight.

This transaction is being reported late due to an administrative oversight.