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Exercise or conversion of derivative security exempted pursuant to Rule 16b-3

Payment of exercise price or tax liability by delivering or withholding securities incident to the receipt, exercise or vesting of a security issued in accordance with Rule 16b-3

Exercise or conversion of derivative security exempted pursuant to Rule 16b-3

• F2 Each Restricted Stock Right (RSR) represents a contingent right to receive an equivalent number of shares in Issuer common stock, or, at the election of the Issuer's Compensation Committee, cash or a combination of cash and Issuer common stock.
• F3 Shares issued upon vesting of RSRs granted under the 2011 Long-Term Incentive Stock Plan (2011 LTISP) on 11/1/23 that vested on 11/2/26.
• F4 Total amount includes (i) 1,008 RSRs granted under the 2011 LTISP on 2/14/24 that will vest on 2/16/27; (ii) 638 RSRs granted under the 2011 LTISP on 7/31/24 that will vest on 8/2/27 ; (iii) 2,456 RSRs granted under the 2024 Long-Term Incentive Stock Plan (2024 LTISP) on 2/18/25 that will vest on 2/18/28; and (iv) 1,701 RSRs granted under the 2024 LTISP on 2/11/26 that will vest on 2/12/29.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 27, 2026.
• F2 Represents the weighted average sale price of $553.39 rounded to the nearest hundredth. The highest price at which the shares were sold was $553.80 and the lowest price at which the shares were sold was $553.19. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 27, 2026.
• F3 Represents the weighted average sale price of $554.48 rounded to the nearest hundredth. The highest price at which the shares were sold was $554.99 and the lowest price at which the shares were sold was $554.01. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 27, 2026.
• F4 Represents the weighted average sale price of $555.46 rounded to the nearest hundredth. The highest price at which the shares were sold was $555.89 and the lowest price at which the shares were sold was $555.03. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 27, 2026.
• F5 Represents the weighted average sale price of $556.47 rounded to the nearest hundredth. The highest price at which the shares were sold was $556.60 and the lowest price at which the shares were sold was $556.03. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 27, 2026.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Each Market Stock Unit (MSU) represents the contingent right to receive, following vesting, between 0% and 150% of one share of the Issuer's common stock, subject to the Issuer's absolute stock price appreciation or depreciation over a performance period ending December 31, 2031. No portion of the MSUs will be earned if the Issuer's stock price depreciates by more than 25%, a 100% (or target) payout is earned if the Issuer's stock price appreciates by 10%, and a 150% payout is earned if the Issuer's stock price appreciates by 50% or more. The target number of MSUs is reported in this Report. Grant awarded pursuant to Rule 16b-3(d).

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F2 Represents the weighted average sale price of $544.53 rounded to the nearest hundredth. The highest price at which the shares were sold was $544.81 and the lowest price at which the shares were sold was $544.03. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F3 Represents the weighted average sale price of $545.59 rounded to the nearest hundredth. The highest price at which the shares were sold was $545.82 and the lowest price at which the shares were sold was $545.12. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F4 Represents the weighted average sale price of $546.42 rounded to the nearest hundredth. The highest price at which the shares were sold was $546.89 and the lowest price at which the shares were sold was $546.05. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F5 Represents the weighted average sale price of $547.42 rounded to the nearest hundredth. The highest price at which the shares were sold was $547.94 and the lowest price at which the shares were sold was $547.12. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F6 Represents the weighted average sale price of $548.32 rounded to the nearest hundredth. The highest price at which the shares were sold was $548.78 and the lowest price at which the shares were sold was $548.11. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F7 Represents the weighted average sale price of $549.50 rounded to the nearest hundredth. The highest price at which the shares were sold was $549.74 and the lowest price at which the shares were sold was $549.03. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F8 Represents the weighted average sale price of $554.14 rounded to the nearest hundredth. The highest price at which the shares were sold was $554.17 and the lowest price at which the shares were sold was $554.11. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Amount includes (i) 3,160 shares of common stock; and (ii) 13,577 shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under Rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Amount includes (i) 635 shares of common stock; and (ii) 6,103 shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under Rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Amount includes (i) 2,475 shares of common stock; and (ii) 349 shares of common stock, including dividends, held in a stock unit account pursuant to the Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under Rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Amount includes (i) 78 shares of common stock; and (ii) 1,540 shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under Rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2024 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Amount includes (i) 488 shares of common stock; and (ii) 3,982 shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under Rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan and the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F2 Represents the weighted average sale price of $568.75 rounded to the nearest hundredth. The highest price at which the shares were sold was $568.92 and the lowest price at which the shares were sold was $568.49. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F3 Represents the weighted average sale price of $569.49 rounded to the nearest hundredth. The highest price at which the shares were sold was $569.97 and the lowest price at which the shares were sold was $569.01. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F4 Represents the weighted average sale price of $570.47 rounded to the nearest hundredth. The highest price at which the shares were sold was $570.84 and the lowest price at which the shares were sold was $570.25. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F5 Represents the weighted average sale price of $571.74 rounded to the nearest hundredth. The highest price at which the shares were sold was $571.98 and the lowest price at which the shares were sold was $571.32. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F6 Represents the weighted average sale price of $572.72 rounded to the nearest hundredth. The highest price at which the shares were sold was $572.98 and the lowest price at which the shares were sold was $572.51. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F7 Represents the weighted average sale price of $573.51 rounded to the nearest hundredth. The highest price at which the shares were sold was $573.80 and the lowest price at which the shares were sold was $573.14. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F8 Represents the weighted average sale price of $574.51 rounded to the nearest hundredth. The highest price at which the shares were sold was $574.66 and the lowest price at which the shares were sold was $574.35. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F9 Represents the weighted average sale price of $575.59 rounded to the nearest hundredth. The highest price at which the shares were sold was $575.99 and the lowest price at which the shares were sold was $575.38. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.
• F10 Represents the weighted average sale price of $576.38 rounded to the nearest hundredth. The highest price at which the shares were sold was $576.87 and the lowest price at which the shares were sold was $576.03. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

Open market or private sale of non-derivative or derivative security

• F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 23, 2025.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Grant, award or other acquisition pursuant to Rule 16b-3(d)

• F1 Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2024 Long-Term Incentive Stock Plan (the Plan) in a transaction exempt pursuant to Rule 16b-3.
• F2 Represents shares of common stock, including dividends, held in a stock unit account pursuant to the Plan. Dividends earned on shares held in the stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

Open market or private sale of non-derivative or derivative security

• F1 The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 28, 2025.

Open market or private sale of non-derivative or derivative security

• F1 The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 30, 2025.

Open market or private sale of non-derivative or derivative security

• F1 The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 28, 2025.

Open market or private sale of non-derivative or derivative security