NOC

SEC source: 0001225208-18-004219 · doc4a.xml · derivative · entry 3

Pamiljans Janis G · CIK 0001701037 · Corp VP & President AS Systems

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,142

Underlying: Common Stock · 6,037.79 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on (i) 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17 and (ii) 2/17/16 with a measurement period that ended 12/31/17. RPSRs to be settled at 131% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

F3 · derivative.exercise_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F3 · derivative.expiration_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F4 · balance_after: Total amount includes 6,961 RPSRs granted on 2/13/18 with a measurement period ending on 12/31/20; 9,395 RPSRs granted on 4/1/17 with a measurement period ending on 12/31/19; and 1,786 RPSRs granted on 2/17/17 with a measurement period ending on 12/31/19.

SEC source: 0001225208-18-004219 · doc4a.xml · nonDerivative · entry 2

Pamiljans Janis G · CIK 0001701037 · Corp VP & President AS Systems

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,622.15

F2 · shares: Shares surrendered to issuer in payment of tax liability in connection with settlement of RPSRs in accordance with Rule 16b-3(e). Amendment filed to correct the number of shares surrendered.

SEC source: 0001225208-18-004219 · doc4a.xml · nonDerivative · entry 1

Pamiljans Janis G · CIK 0001701037 · Corp VP & President AS Systems

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,079.15

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on (i) 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17 and (ii) 2/17/16 with a measurement period that ended 12/31/17. RPSRs to be settled at 131% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

SEC source: 0001225208-18-004215 · doc4a.xml · derivative · entry 3

Jones Christopher T · CIK 0001559104 · Corp VP & Pres Tech Svcs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,012

Underlying: Common Stock · 16,275 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

F3 · derivative.exercise_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F3 · derivative.expiration_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F4 · balance_after: Total amount includes 5,966 RPSRs granted on 2/13/18 with a measurement period ending on 12/31/20; 9,151 RPSRs granted on 2/17/17 with a measurement period ending on 12/31/19; and 10,895 RPSRs granted on 2/17/16 with a measurement period ending on 12/31/18.

SEC source: 0001225208-18-004215 · doc4a.xml · nonDerivative · entry 2

Jones Christopher T · CIK 0001559104 · Corp VP & Pres Tech Svcs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,232.649

F2 · shares: Shares surrendered to issuer in payment of tax liability in connection with settlement of RPSRs in accordance with Rule 16b-3(e). Amendment filed to correct the number of shares surrendered.

SEC source: 0001225208-18-004215 · doc4a.xml · nonDerivative · entry 1

Jones Christopher T · CIK 0001559104 · Corp VP & Pres Tech Svcs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,460.649

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

SEC source: 0001225208-18-004212 · doc4a.xml · derivative · entry 3

Caylor Mark A · CIK 0001559097 · Corp VP & Pres, Mission System

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,666

Underlying: Common Stock · 10,357.5 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

F3 · derivative.exercise_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F3 · derivative.expiration_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F4 · balance_after: Total amount includes 6,961 RPSRs granted on 2/13/18 with a measurement period ending on 12/31/20; 7,626 RPSRs granted on 2/17/17 with a measurement period ending on 12/31/19; and 9,079 RPSRs granted on 2/17/16 with a measurement period ending on 12/31/18.

SEC source: 0001225208-18-004212 · doc4a.xml · nonDerivative · entry 2

Caylor Mark A · CIK 0001559097 · Corp VP & Pres, Mission System

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,325.31

F2 · shares: Shares surrendered to issuer in payment of tax liability in connection with settlement of RPSRs in accordance with Rule 16b-3(e). Amendment filed to correct the number of shares surrendered.

SEC source: 0001225208-18-004212 · doc4a.xml · nonDerivative · entry 1

Caylor Mark A · CIK 0001559097 · Corp VP & Pres, Mission System

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,242.31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

SEC source: 0001225208-18-004213 · doc4a.xml · derivative · entry 3

CHESTON SHEILA C. · CIK 0001499087 · Corp. VP & General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,876

Underlying: Common Stock · 14,796 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

F3 · derivative.exercise_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F3 · derivative.expiration_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F4 · balance_after: Total amount includes 5,171 RPSRs granted on 2/13/18 with a measurement period ending on 12/31/20; 7,626 RPSRs granted on 2/17/17 with a measurement period ending on 12/31/19; and 9,079 RPSRs granted on 2/17/16 with a measurement period ending on 12/31/18.

SEC source: 0001225208-18-004213 · doc4a.xml · nonDerivative · entry 2

CHESTON SHEILA C. · CIK 0001499087 · Corp. VP & General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,731.52

F2 · shares: Shares surrendered to issuer in payment of tax liability in connection with settlement of RPSRs in accordance with Rule 16b-3(e). Amendment filed to correct the number of shares surrendered.

SEC source: 0001225208-18-004213 · doc4a.xml · nonDerivative · entry 1

CHESTON SHEILA C. · CIK 0001499087 · Corp. VP & General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 58,857.52

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

SEC source: 0001225208-18-004214 · doc4a.xml · derivative · entry 3

Hardesty Michael A · CIK 0001569355 · Corp VP, Controller & CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,472.2

Underlying: Common Stock · 3,128.28 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 131% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

F3 · derivative.exercise_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F3 · derivative.expiration_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F4 · balance_after: Total amount includes 1,475 RPSRs granted on 2/13/18 with a measurement period ending on 12/31/20; 1,786 RPSRs granted on 2/17/17 with a measurement period ending on 12/31/19; and 2,211 RPSRs granted on 2/17/16 with a measurement period ending on 12/31/18.

SEC source: 0001225208-18-004214 · doc4a.xml · nonDerivative · entry 2

Hardesty Michael A · CIK 0001569355 · Corp VP, Controller & CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,583.64

F2 · shares: Shares surrendered to issuer in payment of tax liability in connection with settlement of RPSRs in accordance with Rule 16b-3(e). Amendment filed to correct the number of shares surrendered.

SEC source: 0001225208-18-004214 · doc4a.xml · nonDerivative · entry 1

Hardesty Michael A · CIK 0001569355 · Corp VP, Controller & CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,678.64

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 131% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

SEC source: 0001225208-18-004211 · doc4a.xml · derivative · entry 3

Bedingfield Kenneth L · CIK 0001539147 · Corp VP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,770

Underlying: Common Stock · 17,755.5 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

F3 · derivative.exercise_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F3 · derivative.expiration_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F4 · balance_after: Total amount includes 6,961 RPSRs granted on 2/13/18 with a measurement period ending on 12/31/20; 9,914 RPSRs granted on 2/17/17 with a measurement period ending on 12/31/19; and 10,895 RPSRs granted on 2/17/16 with a measurement period ending on 12/31/18.

SEC source: 0001225208-18-004211 · doc4a.xml · nonDerivative · entry 2

Bedingfield Kenneth L · CIK 0001539147 · Corp VP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,454.57

F2 · shares: Shares surrendered to issuer in payment of tax liability in connection with settlement of RPSRs in accordance with Rule 16b-3(e). Amendment filed to correct the number of shares surrendered.

SEC source: 0001225208-18-004211 · doc4a.xml · nonDerivative · entry 1

Bedingfield Kenneth L · CIK 0001539147 · Corp VP, CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 39,986.57

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

SEC source: 0001225208-18-004207 · doc4a.xml · derivative · entry 3

Antkowiak Patrick M. · CIK 0001626333 · Corp VP & CTO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,670

Underlying: Common Stock · 5,919 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

F3 · derivative.exercise_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F3 · derivative.expiration_date: Each RPSR represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the Issuer's election, cash or a combination of cash and Issuer common stock. The RPSRs vest if the application performance metric is satisfied for the relevant measurement period. Grants awarded pursuant to Rule 16b-3(d).

F4 · balance_after: Total amount includes 1,989 RPSRs granted on 2/13/18 with a measurement period ending on 12/31/20; 3,050 RPSRs granted on 2/17/17 with a measurement period ending on 12/31/19; and 3,631 RPSRs granted on 2/17/16 with a measurement period ending on 12/31/18.

SEC source: 0001225208-18-004207 · doc4a.xml · nonDerivative · entry 2

Antkowiak Patrick M. · CIK 0001626333 · Corp VP & CTO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,535.72

F2 · shares: Shares surrendered to issuer in payment of tax liability in connection with settlement of RPSRs in accordance with Rule 16b-3(e). Amendment filed to correct the number of shares surrendered.

SEC source: 0001225208-18-004207 · doc4a.xml · nonDerivative · entry 1

Antkowiak Patrick M. · CIK 0001626333 · Corp VP & CTO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,098.72

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares expected to be issued in settlement of Restricted Performance Stock Rights ("RPSRs") granted under the 2011 Long-Term Incentive Stock Plan ("LTISP") on 2/18/15 with a valuation of performance measurement period ("measurement period") that ended 12/31/17. RPSRs to be settled at 150% of target. The shares are anticipated to be distributed into the participant's account on February 26, 2018.

SEC source: 0001225208-18-000398 · doc4.xml · nonDerivative · entry 1

KRAPEK KARL J · CIK 0001238288 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,333

F1 · kind: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Amount includes (i) 7,125 shares of common stock; and (ii) 22,208 shares of common stock held in a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan and the 1993 Stock Plan for Non-Employee Directors.

SEC source: 0001225208-18-000396 · doc4.xml · nonDerivative · entry 1

Brown Marianne · CIK 0001600605 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,371

F1 · kind: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan.

SEC source: 0001225208-17-018602 · doc4.xml · nonDerivative · entry 1

FUDGE ANN M · CIK 0001198098 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,874

SEC source: 0001225208-17-017338 · doc4.xml · nonDerivative · entry 3

FLACH GLORIA A · CIK 0001484625 · CVP & Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 71,258.98

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F4 · price: Represents the weighted average sale price of $297.10 rounded to the nearest hundredth. The highest price at which the shares were sold was $297.73 and the lowest price at which the shares were sold was $296.86. 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.

SEC source: 0001225208-17-017338 · doc4.xml · nonDerivative · entry 2

FLACH GLORIA A · CIK 0001484625 · CVP & Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,399.98

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3 · price: Represents the weighted average sale price of $296.54 rounded to the nearest hundredth. The highest price at which the shares were sold was $296.85 and the lowest price at which the shares were sold was $295.89. 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.

SEC source: 0001225208-17-017338 · doc4.xml · nonDerivative · entry 1

FLACH GLORIA A · CIK 0001484625 · CVP & Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,199.98

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: Represents the weighted average sale price of $295.16 rounded to the nearest hundredth. The highest price at which the shares were sold was $295.80 and the lowest price at which the shares were sold was $294.84. 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.

SEC source: 0001225208-17-017045 · doc4.xml · nonDerivative · entry 1

Peppard Denise M. · CIK 0001421154 · Corp VP & Chf HR Ofcr

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,552.62

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001225208-17-016947 · doc4.xml · nonDerivative · entry 1

Peppard Denise M. · CIK 0001421154 · Corp VP & Chf HR Ofcr

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,880.62

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001225208-17-016946 · doc4.xml · nonDerivative · entry 1

Jones Christopher T · CIK 0001559104 · Corp VP & Pres Tech Svcs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 58,185.649

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001225208-19-004964 · doc4.xml · nonDerivative · entry 2

Warden Kathy J · CIK 0001559112 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · Held by mother

Disclosed balance after: 0

F1 · security: Owned by the Reporting Person's mother, who shared the Reporting Person's household on a temporary basis in 2017, during which time the securities were purchased and sold without the Reporting Person's knowledge. The Reporting Person disclaims beneficial ownership of the securities and this filing shall not be deemed to be an admission that the Reporting Person was the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001225208-17-016680 · doc4.xml · nonDerivative · entry 1

ASHWORTH SID · CIK 0001499703 · Corp VP, Government Relations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,146.62

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001225208-19-004964 · doc4.xml · nonDerivative · entry 1

Warden Kathy J · CIK 0001559112 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Indirect · Held by mother

Disclosed balance after: 67

F1 · security: Owned by the Reporting Person's mother, who shared the Reporting Person's household on a temporary basis in 2017, during which time the securities were purchased and sold without the Reporting Person's knowledge. The Reporting Person disclaims beneficial ownership of the securities and this filing shall not be deemed to be an admission that the Reporting Person was the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

SEC source: 0001225208-17-015778 · doc4.xml · nonDerivative · entry 1

KRAPEK KARL J · CIK 0001238288 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,144

F1 · kind: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Amount includes (i) 7,125 shares of common stock and (ii) 22,019 shares of common stock held in a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan and the 1993 Stock Plan for Non-Employee Directors.

SEC source: 0001225208-17-015777 · doc4.xml · nonDerivative · entry 1

Brown Marianne · CIK 0001600605 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,252

F1 · kind: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan.

SEC source: 0001225208-17-013189 · doc4.xml · nonDerivative · entry 1

Warden Kathy J · CIK 0001559112 · Corp VP & Pres Mission Syst

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,337.35

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: Represents the weighted average sale price of $263.41 rounded to the nearest hundredth. The highest price at which the shares were sold was $264.00 and the lowest price at which the shares were sold was $263.25. 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.

SEC source: 0001225208-17-013188 · doc4.xml · nonDerivative · entry 2

Jones Christopher T · CIK 0001559104 · Corp VP & Pres Tech Svcs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 59,435.649

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001225208-17-013188 · doc4.xml · nonDerivative · entry 1

Jones Christopher T · CIK 0001559104 · Corp VP & Pres Tech Svcs

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,435.649

F1 · shares: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001225208-17-013187 · doc4.xml · nonDerivative · entry 1

DAVIS LISA R · CIK 0001668228 · Corp VP, Communications

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 961.07

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001225208-17-013104 · doc4.xml · derivative · entry 3

DAVIS LISA R · CIK 0001668228 · Corp VP, Communications

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,333

Underlying: Common Stock · 1,315 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the election of the Issuer's Compensation Committee, cash or a combination of cash and Issuer common stock. The RSRs were granted under the LTISP on 7/29/14 and vested on 7/29/17.

F1 · shares: In light of the vesting date, Saturday, July 29, 2017, and in accordance with the terms of the 2011 Long-Term Incentive Stock Plan ("LTISP"), award shares were valued based on the Company's closing stock price on July 28, 2017, the immediately preceding business day. The shares were distributed into the participant's account on July 31, 2017.

F3 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the election of the Issuer's Compensation Committee, cash or a combination of cash and Issuer common stock. The RSRs were granted under the LTISP on 7/29/14 and vested on 7/29/17.

F3 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Issuer common stock, or, at the election of the Issuer's Compensation Committee, cash or a combination of cash and Issuer common stock. The RSRs were granted under the LTISP on 7/29/14 and vested on 7/29/17.

F4 · balance_after: Total amount includes 1,276 RSRs granted under the LTISP on 2/17/17 that will vest on 2/17/20; 1,648 RSRs granted under the LTISP on 2/17/16 that will vest on 2/17/19; and 409 RSRs granted under the LTISP on 2/18/15 that will vest on 2/18/18.

SEC source: 0001225208-17-013104 · doc4.xml · nonDerivative · entry 2

DAVIS LISA R · CIK 0001668228 · Corp VP, Communications

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,328.07

F2 · shares: Shares surrendered to issuer in payment of tax liability in connection with vesting of RSRs in accordance with Rule 16b-3(e).

SEC source: 0001225208-17-013104 · doc4.xml · nonDerivative · entry 1

DAVIS LISA R · CIK 0001668228 · Corp VP, Communications

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,907.07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: In light of the vesting date, Saturday, July 29, 2017, and in accordance with the terms of the 2011 Long-Term Incentive Stock Plan ("LTISP"), award shares were valued based on the Company's closing stock price on July 28, 2017, the immediately preceding business day. The shares were distributed into the participant's account on July 31, 2017.

SEC source: 0001225208-17-012154 · doc4.xml · nonDerivative · entry 1

Brown Marianne · CIK 0001600605 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,126

F1 · kind: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan.

SEC source: 0001225208-17-012153 · doc4.xml · nonDerivative · entry 1

KRAPEK KARL J · CIK 0001238288 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,939

F1 · kind: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account, including dividends, pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Amount includes (i) 7,125 shares of common stock; and (ii) 21,814 shares of common stock held in a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan and the 1993 Stock Plan for Non-Employee Directors.

SEC source: 0001225208-17-011421 · doc4.xml · nonDerivative · entry 1

ASHWORTH SID · CIK 0001499703 · Corp VP, Government Relations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 69,457.62

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001225208-17-010112 · doc4.xml · nonDerivative · entry 1

KRAPEK KARL J · CIK 0001238288 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,716

F1 · kind: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Total amount includes (i) 7,125 shares of common stock and (ii) 21,591 shares of common stock, including dividends, held in a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan and the 1993 Stock Plan for Non-Employee Directors. Dividends earned on shares held in stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

SEC source: 0001225208-17-010117 · doc4.xml · nonDerivative · entry 1

Felsinger Donald E · CIK 0001228373 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,966

F1 · kind: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Total amount includes dividends earned on shares held in stock unit account, which transactions were exempt from Section 16 and not reportable under rule 16a-11.

SEC source: 0001225208-17-010116 · doc4.xml · nonDerivative · entry 1

FUDGE ANN M · CIK 0001198098 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,844

F1 · kind: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Total amount includes (i) 77 shares of common stock and (ii) 1,767 shares of common stock, including dividends, held in a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan. Dividends earned on shares held in stock unit account were exempt from Section 16 and not reportable under rule 16a-11.

SEC source: 0001225208-17-010115 · doc4.xml · nonDerivative · entry 1

GORDON BRUCE S · CIK 0001199197 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,148

F1 · kind: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Total amount includes dividends earned on shares held in stock unit account, which transactions were exempt from Section 16 and not reportable under rule 16a-11.

SEC source: 0001225208-17-010114 · doc4.xml · nonDerivative · entry 1

HERNANDEZ WILLIAM H · CIK 0001189027 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,810

F1 · kind: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F1 · shares: Represents shares of common stock deferred into a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan in a transaction exempt pursuant to Rule 16b-3.

F2 · balance_after: Total amount includes (i) 1,000 shares of common stock and (ii) 3,810 shares of common stock, including dividends, held in a stock unit account pursuant to the Northrop Grumman 2011 Long-Term Incentive Stock Plan and the 1993 Stock Plan for Non-Employee Directors. Dividends earned on shares held in stock unit account were exempt from Section 16 and not reportable under rule 16a-11.