ISSC · Innovative Solutions & Support Inc

Each Performance Stock Unit represents a contingent right to receive one share of issuer common stock. The Performance Stock Units vest in equal tranches on each of the first, second and third anniversary of the date of grant, subject to the issuer's common stock achieving specified prices per share.

Each Performance Stock Unit represents a contingent right to receive one share of issuer common stock. The Performance Stock Units vest in equal tranches on each of the first, second and third anniversary of the date of grant, subject to the issuer's common stock achieving specified prices per share.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $15.88 to $15.95, inclusive. The reporting person undertakes to provide to Innovative Solutions & Support, Inc., any security holder of Innovative Solutions & Support, 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 range set forth in this footnote (1).

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock. The RSUs are scheduled to vest on the first anniversary of the grant date, subject to continued service by the reporting person.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock. The RSUs are scheduled to vest on the first anniversary of the grant date, subject to continued service by the reporting person.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock. The RSUs are scheduled to vest on the first anniversary of the grant date, subject to continued service by the reporting person.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock. The RSUs are scheduled to vest on the first anniversary of the grant date, subject to continued service by the reporting person.

Reflects forfeiture of unvested RSUs by reporting person.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock. The RSUs are scheduled to vest on the first anniversary of the grant date, subject to continued service by the reporting person.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock. The RSUs are scheduled to vest on the first anniversary of the grant date, subject to continued service by the reporting person.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

The non-qualified stock option was granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. The option is scheduled to vest in accordance with the following schedule: 1/4th on the first anniversary of the grant date and 1/12th on each quarterly anniversary of the grant date thereafter, subject to continued employment by the reporting person.

The Reporting Person is amending the Form 4 filed on February 19, 2026 to correct the number of performance stock units granted to the Reporting person, which were originally understated due to a clerical error.

Each Performance Stock Unit represents a contingent right to receive one share of issuer common stock. The Performance Stock Units vest upon the issuer's common stock achieving specified prices per share.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock, subject to adjustment as provided in the Award Agreement. The RSUs are scheduled to vest in accordance with the following schedule: 1/4th on the first anniversary of the grant date and 1/12th on each quarterly anniversary of the grant date thereafter, subject to continued employment by the reporting person.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock, subject to adjustment as provided in the Award Agreement. The RSUs are scheduled to vest in accordance with the following schedule: 1/4th on the first anniversary of the grant date and 1/12th on each quarterly anniversary of the grant date thereafter, subject to continued employment by the reporting person.

The Reporting Person is amending the Form 4 filed on February 19, 2026 to correct the number of performance stock units granted to the Reporting person, which were originally understated due to a clerical error.

Each Performance Stock Unit represents a contingent right to receive one share of issuer common stock. The Performance Stock Units vest upon the issuer's common stock achieving specified prices per share.

The non-qualified stock option was granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. The option is scheduled to vest in accordance with the following schedule: 1/4th on the first anniversary of the grant date and 1/12th on each quarterly anniversary of the grant date thereafter, subject to continued employment by the reporting person.

The RSUs were granted pursuant to the Company's 2019 Stock-Based Incentive Compensation Plan. Each RSU represents the right to receive one share of Common Stock. The RSUs are scheduled to vest on the first anniversary of the grant date, subject to continued service by the reporting person.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units.

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

On November 20, 2024, the reporting person was granted 201,000 Performance Stock Units, which vested on the one year anniversary of grant and otherwise in accordance with the Performance Stock Unit award.

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

These shares of common stock were withheld by the issuer to satisfy the reporting person's tax obligations in connection with the vesting of performance stock units.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.

These shares of common stock, par value $0.001 per share, of Innovative Solutions and Support, Inc. are directly held by Klear Kite LLC, a Delaware limited liability company, whose sole member is Christopher Harborne.