AMSC

SEC source: 0001193125-26-396831 · ownership.xml · nonDerivative · entry 1

Littlefield Barbara G. · CIK 0001777725 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,034

F1 · date: This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in connection with Ms. Littlefield's departure from the Company's Board in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 37,034 shares directly.

SEC source: 0001193125-26-267677 · ownership.xml · nonDerivative · entry 2

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 334,377

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F3 · price: The sales were executed in multiple trades at prices ranging from $37.82-$38.06. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 334,377 shares directly.

SEC source: 0001193125-26-267677 · ownership.xml · nonDerivative · entry 1

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 336,120

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F2 · price: The sales were executed in multiple trades at prices ranging from $36.775-$37.73. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-267642 · ownership.xml · nonDerivative · entry 2

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,131,929

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F3 · price: The sales were executed in multiple trades at prices ranging from $37.72-$38.06. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 1,131,929 shares directly.

SEC source: 0001193125-26-267642 · ownership.xml · nonDerivative · entry 1

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,136,538

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F2 · price: The sales were executed in multiple trades at prices ranging from $36.72-$37.63. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-269433 · ownership.xml · nonDerivative · entry 1

Dambier Laura A. · CIK 0001933334 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,992

F1 · kind: The sales reported on this Form 4 were made by the reporting person for tax planning purposes.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 14,992 shares directly.

SEC source: 0001193125-26-265996 · ownership.xml · nonDerivative · entry 2

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 341,146

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F3 · price: The sales were executed in multiple trades at prices ranging from $41.94-$42.86. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 341,146 shares directly.

SEC source: 0001193125-26-265996 · ownership.xml · nonDerivative · entry 1

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 342,695

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F2 · price: The sales were executed in multiple trades at prices ranging from $40.94-$41.90. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-265990 · ownership.xml · nonDerivative · entry 2

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,148,046

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F3 · price: The sales were executed in multiple trades at prices ranging from $41.88-$42.86. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 1,148,046 shares directly.

SEC source: 0001193125-26-265990 · ownership.xml · nonDerivative · entry 1

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,152,724

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F2 · price: The sales were executed in multiple trades at prices ranging from $40.86-$41.74. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-255471 · ownership.xml · nonDerivative · entry 8

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 345,981

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F9 · price: The sales were executed in multiple trades at prices ranging from $50.35-$50.99. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F10 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 345,981 shares directly.

SEC source: 0001193125-26-255471 · ownership.xml · nonDerivative · entry 7

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 346,590

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F8 · price: The sales were executed in multiple trades at prices ranging from $48.87-$49.62. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-255471 · ownership.xml · nonDerivative · entry 6

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 349,228

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F7 · price: The sales were executed in multiple trades at prices ranging from $47.80-$48.76. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 9

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,157,716

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F10 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 1,157,716 shares directly.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 8

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,158,533

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F9 · price: The sales were executed in multiple trades at prices ranging from $49.89-$50.82. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 7

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,159,033

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F8 · price: The sales were executed in multiple trades at prices ranging from $48.87-$49.84. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 6

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,163,534

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F7 · price: The sales were executed in multiple trades at prices ranging from $47.80-$48.76. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001193125-26-255471 · ownership.xml · nonDerivative · entry 5

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 352,428

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F6 · price: The sales were executed in multiple trades at prices ranging from $52.00-$52.37. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected.

SEC source: 0001193125-26-255471 · ownership.xml · nonDerivative · entry 4

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 353,028

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F5 · price: The sales were executed in multiple trades at prices ranging from $50.99-$51.90. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected.

SEC source: 0001193125-26-255471 · ownership.xml · nonDerivative · entry 3

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 365,064

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F4 · price: The sales were executed in multiple trades at prices ranging from $49.99-$50.95. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected.

SEC source: 0001193125-26-255471 · ownership.xml · nonDerivative · entry 2

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 377,186

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025.

F3 · price: The sales were executed in multiple trades at prices ranging from $48.95-$49.87. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 5

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,170,609

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F6 · price: The sales were executed in multiple trades at prices ranging from $52.00-$52.44. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 4

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,172,914

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F5 · price: The sales were executed in multiple trades at prices ranging from $50.99-$51.945. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 3

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,201,472

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F4 · price: The sales were executed in multiple trades at prices ranging from $49.99-$50.98. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 2

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,229,372

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025, as modified on February 26, 2026.

F3 · price: The sales were executed in multiple trades at prices ranging from $48.95-$49.87. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected.

SEC source: 0001193125-26-255471 · ownership.xml · nonDerivative · entry 1

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 382,890

F1 · shares: The restricted stock award was granted on June 1, 2026. The award will vest in three equal annual installments beginning June 10, 2027.

SEC source: 0001193125-26-255450 · ownership.xml · nonDerivative · entry 1

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,243,134

F1 · shares: The restricted stock award was granted on June 1, 2026. The award will vest in three equal annual installments beginning June 10, 2027.

SEC source: 0001193125-26-145815 · ownership.xml · nonDerivative · entry 1

Donnelly Terence Robert · CIK 0002069768 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,665

F1 · date: This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 2,665 shares directly.

SEC source: 0001193125-26-145810 · ownership.xml · nonDerivative · entry 1

OLIVER DAVID R JR · CIK 0001376216 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,823

F1 · date: This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 63,823 shares directly.

SEC source: 0001193125-26-145803 · ownership.xml · nonDerivative · entry 1

Littlefield Barbara G. · CIK 0001777725 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,427

F1 · date: This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 35,427 shares directly.

SEC source: 0001193125-26-145795 · ownership.xml · nonDerivative · entry 1

House Arthur H · CIK 0001685155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,779

F1 · date: This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 51,779 shares directly.

SEC source: 0001193125-26-145799 · ownership.xml · nonDerivative · entry 1

Klein Margaret D. · CIK 0001933357 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,492

F1 · date: This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 19,492 shares directly.

SEC source: 0001193125-26-145787 · ownership.xml · nonDerivative · entry 1

Dambier Laura A. · CIK 0001933334 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,992

F1 · date: This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 18,992 shares directly.

SEC source: 0001193125-26-077349 · ownership.xml · nonDerivative · entry 1

OLIVER DAVID R JR · CIK 0001376216 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,707

F1 · kind: The sales reported on this Form 4 were made by the reporting person for tax planning purposes.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 60,707 shares directly.

SEC source: 0000950170-25-105858 · ownership.xml · nonDerivative · entry 2

House Arthur H · CIK 0001685155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,663

F1 · kind: The sales reported on this Form 4 were made by the reporting person for tax and estate planning purposes.

F2 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 48,663 shares directly.

SEC source: 0000950170-25-105858 · ownership.xml · derivative · entry 3

House Arthur H · CIK 0001685155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 9,703 shares

Expires 2026-09-20

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_date: The stock option was automatically granted under the Amended and Restated 2007 Director Stock Plan on the third business day following the reporting person's election to the Board. The stock option vested in two equal annual installments beginning September 20, 2017, and became fully vested and exerciseable on September 20, 2018.

SEC source: 0000950170-25-105858 · ownership.xml · nonDerivative · entry 1

House Arthur H · CIK 0001685155 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,366

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.

SEC source: 0000950170-25-104149 · ownership.xml · nonDerivative · entry 2

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,183,134

F2 · price: The sales were executed in multiple trades at prices ranging from $54.87-$55.34. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 1,183,134 shares directly.

SEC source: 0000950170-25-104149 · ownership.xml · nonDerivative · entry 1

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,210,877

F1 · price: The sales were executed in multiple trades at prices ranging from $53.85-$54.83. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0000950170-25-104131 · ownership.xml · nonDerivative · entry 3

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Indirect · By 401(k) plan

Disclosed balance after: 0

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 0 shares indirectly through the issuer's 401(k) plan as of August 6, 2025.

SEC source: 0000950170-25-104131 · ownership.xml · nonDerivative · entry 2

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 352,890

F2 · price: The sales were executed in multiple trades at prices ranging from $55.00-$55.34. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F3 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 352,890 shares directly.

SEC source: 0000950170-25-104131 · ownership.xml · nonDerivative · entry 1

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 368,630

F1 · price: The sales were executed in multiple trades at prices ranging from $54.00-$54.94. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0000950170-25-085421 · ownership.xml · nonDerivative · entry 2

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,283,982

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2024.

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 1,283,982 shares directly.

SEC source: 0000950170-25-085421 · ownership.xml · nonDerivative · entry 1

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,284,482

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2024.

F3 · price: The sales were executed in multiple trades at prices ranging from $28.06-$28.87. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0000950170-25-085408 · ownership.xml · nonDerivative · entry 2

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 402,890

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2024.

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F4 · price: The sales were executed in multiple trades at prices ranging from $29.08-$29.09. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F5 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 402,890 shares directly.

SEC source: 0000950170-25-085408 · ownership.xml · nonDerivative · entry 1

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 403,190

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2024.

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F3 · price: The sales were executed in multiple trades at prices ranging from $28.06-$28.83. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0000950170-25-083826 · ownership.xml · nonDerivative · entry 1

Kosiba John W JR · CIK 0001703463 · SVP, CFO & Treasurer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 409,532

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2024.

F2 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F3 · price: The sales were executed in multiple trades at prices ranging from $31.44-$32.23. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 409,532 shares directly.

SEC source: 0000950170-25-083818 · ownership.xml · nonDerivative · entry 1

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,296,797

F1 · kind: Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards.

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2024.

F3 · price: The sales were executed in multiple trades at prices ranging from $31.44-$32.23. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 1,296,797 shares directly.

SEC source: 0000950170-25-079169 · ownership.xml · nonDerivative · entry 2

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,304,486

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2024. Includes shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of a restricted stock award.

F3 · price: The sales were executed in multiple trades at prices ranging from $26.15-$27.10. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.

F4 · balance_after: Following all the transactions reported on this Form 4, the reporting person holds 1,304,486 shares directly.

SEC source: 0000950170-25-079169 · ownership.xml · nonDerivative · entry 1

McGahn Daniel P · CIK 0001425153 · Director · Chairman, President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,402,635

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2024. Includes shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of a restricted stock award.

F2 · price: The sales were executed in multiple trades at prices ranging from $25.10-$26.00. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected.