LDOS · Leidos Holdings, Inc.

These shares were withheld by the Company to satisfy the reporting person's tax obligation associated with previously reported awards of restricted stock units. This share withholding was authorized in the restricted stock award agreement.

These shares were withheld by the Company to satisfy the reporting person's tax obligation associated with previously reported awards of restricted stock units. This share withholding was authorized in the restricted stock award agreement.

These shares were withheld by the Company to satisfy the reporting person's tax obligation associated with previously reported awards of restricted stock units. This share withholding was authorized in the restricted stock award agreement.

The reporting person elected to defer receipt of these shares, which represent a quarterly payment of their retainer for service on the company's Board of Directors, under the terms of the Leidos Holdings, Inc. Key Executive Stock Deferral Plan.

Dividend equivalent rights.

Dividend equivalent rights.

Dividend equivalent rights.

Dividend equivalent rights.

Dividend equivalent rights.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the date that the next annual meeting of the stockholders of the Company is concluded.

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices from $132.50 to $132.90 inclusive. The reporting person undertakes to providing to Leidos Holdings, Inc., any security holder of Leidos Holdings, Inc., or the staff of the Securities Exchange Commission upon request, full information regarding the number of shares sold at each separate price within the aforementioned range.

Represents shares of common stock withheld by the issuer in connection with the option exercise to cover the exercise price and associated fees.

These shares were withheld by the Company to satisfy the reporting person's tax obligation associated with previously reported awards of restricted stock units. This share withholding was authorized in the restricted stock award agreement.

These shares were withheld by the Company to satisfy the reporting person's tax obligation associated with previously reported awards of restricted stock units. This share withholding was authorized in the restricted stock award agreement.

Dividend equivalent rights.

These shares were withheld by the Company to satisfy the reporting person's tax obligation associated with previously reported awards of restricted stock units. This share withholding was authorized in the restricted stock award agreement.

Dividend equivalent rights.

The reporting person elected to defer receipt of these shares, which represent a quarterly payment of their retainer for service on the company's Board of Directors, under the terms of the Leidos Holdings, Inc. Key Executive Stock Deferral Plan.

This transaction was executed pursuant to a trading plan entered into by the reporting person on September 12, 2025, in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices from $158.17 to $159.10 inclusive. The reporting person undertakes to providing to Leidos Holdings, Inc., any security holder of Leidos Holdings, Inc., or the staff of the Securities Exchange Commission upon request, full information regarding the number of shares sold at each separate price within the aforementioned range.

This transaction was executed pursuant to a trading plan entered into by the reporting person on September 12, 2025, in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.

Dividend equivalent rights.

Dividend equivalent rights.

Dividend equivalent rights.

Dividend equivalent rights.

Dividend equivalent rights.

Represents shares of common stock withheld by the issuer in connection with the option exercise to cover the exercise price and associated fees.

These shares were withheld by the Company to satisfy the reporting person's tax obligation associated with previously reported awards of restricted stock units. This share withholding was authorized in the restricted stock award agreement.