ARM

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · derivative · entry 14

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 47,982

Underlying: Ordinary Shares · 4,706 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 unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F8 · derivative.exercise_date: This RSU award was granted on May 23, 2023 and vested on May 15, 2026.

F8 · derivative.expiration_date: This RSU award was granted on May 23, 2023 and vested on May 15, 2026.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · derivative · entry 13

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 52,688

Underlying: Ordinary Shares · 1,743 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 unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F6 · derivative.exercise_date: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

F6 · derivative.expiration_date: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · derivative · entry 12

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 54,431

Underlying: Ordinary Shares · 1,751 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 unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F4 · derivative.exercise_date: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

F4 · derivative.expiration_date: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · derivative · entry 11

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 56,182

Underlying: Ordinary Shares · 5,566 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F12 · derivative.exercise_date: This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

F12 · derivative.expiration_date: This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · nonDerivative · entry 8

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 57,394

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F10 · price: Represents weighted average sales price. The shares were sold at prices ranging from $212.51 to $212.76. The reporting person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · nonDerivative · entry 7

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,394

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F9 · kind: Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · nonDerivative · entry 6

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 79,711

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F8 · shares: This RSU award was granted on May 23, 2023 and vested on May 15, 2026.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · nonDerivative · entry 5

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 75,005

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F7 · shares: Represents performance-based RSUs granted on May 23, 2023, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · nonDerivative · entry 4

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 60,605

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F6 · shares: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · nonDerivative · entry 3

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 58,862

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F5 · shares: Represents performance-based RSUs granted on May 13, 2024, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · nonDerivative · entry 2

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 54,418

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F4 · shares: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000078 · wk-form4_1779225799.xml · nonDerivative · entry 1

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 52,667

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F2 · shares: Represents performance-based restricted stock units granted on May 1, 2025, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee (the "Remuneration Committee") of the Board of Directors of the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · derivative · entry 9

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 138,760

Underlying: Ordinary Shares · 3,950 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 unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F5 · derivative.exercise_date: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

F5 · derivative.expiration_date: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · derivative · entry 8

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 142,710

Underlying: Ordinary Shares · 4,184 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 unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F4 · derivative.exercise_date: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

F4 · derivative.expiration_date: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · derivative · entry 7

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 146,894

Underlying: Ordinary Shares · 15,716 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F9 · derivative.exercise_date: This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

F9 · derivative.expiration_date: This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · nonDerivative · entry 6

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,941

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F8 · kind: Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · nonDerivative · entry 5

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,251

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F7 · shares: Represents performance-based RSUs granted on May 23, 2023, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · nonDerivative · entry 4

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,873

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F6 · shares: Represents performance-based RSUs granted on May 13, 2024, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · nonDerivative · entry 3

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,802

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F5 · shares: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · nonDerivative · entry 2

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,852

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F4 · shares: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000074 · wk-form4_1779225465.xml · nonDerivative · entry 1

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,668

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F2 · shares: Represents performance-based restricted stock units granted on May 1, 2025, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee (the "Remuneration Committee") of the Board of Directors of the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000072 · wk-form4_1779225192.xml · derivative · entry 5

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 123,505

Underlying: Ordinary Shares · 2,200 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 unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F4 · derivative.exercise_date: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

F4 · derivative.expiration_date: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

SEC source: 0001973239-26-000072 · wk-form4_1779225192.xml · derivative · entry 4

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 125,705

Underlying: Ordinary Shares · 8,044 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F6 · derivative.exercise_date: This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

F6 · derivative.expiration_date: This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

SEC source: 0001973239-26-000072 · wk-form4_1779225192.xml · nonDerivative · entry 3

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,905

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F5 · kind: Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs.

SEC source: 0001973239-26-000072 · wk-form4_1779225192.xml · nonDerivative · entry 2

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,577

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F4 · shares: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000072 · wk-form4_1779225192.xml · nonDerivative · entry 1

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,377

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F2 · shares: Represents performance-based restricted stock units granted on May 1, 2025, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee (the "Remuneration Committee") of the Board of Directors of the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000070 · wk-form4_1779225013.xml · nonDerivative · entry 4

Haas Rene A. · CIK 0001998912 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 396,007

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F6 · kind: Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs.

SEC source: 0001973239-26-000070 · wk-form4_1779225013.xml · nonDerivative · entry 3

Haas Rene A. · CIK 0001998912 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 539,323

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F5 · shares: Represents performance-based RSUs granted on May 23, 2023, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000070 · wk-form4_1779225013.xml · nonDerivative · entry 2

Haas Rene A. · CIK 0001998912 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 377,323

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F4 · shares: Represents performance-based RSUs granted on May 13, 2024, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001973239-26-000070 · wk-form4_1779225013.xml · nonDerivative · entry 1

Haas Rene A. · CIK 0001998912 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 325,632

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F2 · shares: Performance-based restricted stock units granted on May 1, 2025, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee (the "Remuneration Committee") of the Board of Directors of the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · derivative · entry 9

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,951

Underlying: Ordinary Shares · 4,647 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 unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F6 · derivative.exercise_date: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

F6 · derivative.expiration_date: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · derivative · entry 8

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 144,598

Underlying: Ordinary Shares · 4,670 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 unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F4 · derivative.exercise_date: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

F4 · derivative.expiration_date: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · derivative · entry 7

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149,268

Underlying: Ordinary Shares · 14,842 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F9 · derivative.exercise_date: This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

F9 · derivative.expiration_date: This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · nonDerivative · entry 6

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 206,152

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F8 · kind: Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · nonDerivative · entry 5

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 244,102

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F7 · shares: Represents performance-based RSUs granted on May 23, 2023, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · nonDerivative · entry 4

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 186,501

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F6 · shares: This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · nonDerivative · entry 3

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,854

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F5 · shares: Represents performance-based RSUs granted on May 13, 2024, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · nonDerivative · entry 2

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 170,005

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F4 · shares: This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001533913-26-000007 · wk-form4_1779224849.xml · nonDerivative · entry 1

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 165,335

F1 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F2 · shares: Represents performance-based restricted stock units granted on May 1, 2025, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee (the "Remuneration Committee") of the Board of Directors of the Company.

F3 · price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001628280-26-036565 · wk-form4_1779224665.xml · derivative · entry 3

JACOBS PAUL E · CIK 0001191310 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,531

Underlying: Ordinary Shares · 1,531 shares

Expires not disclosed

F3 · derivative.exercise_price: Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F4 · derivative.exercise_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc.

F4 · derivative.expiration_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc.

SEC source: 0001628280-26-036565 · wk-form4_1779224665.xml · derivative · entry 2

JACOBS PAUL E · CIK 0001191310 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 2,141 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 RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F2 · derivative.exercise_date: The restricted stock units ("RSUs") vested in full on May 15, 2026.

F2 · derivative.expiration_date: The restricted stock units ("RSUs") vested in full on May 15, 2026.

SEC source: 0001628280-26-036565 · wk-form4_1779224665.xml · nonDerivative · entry 1

JACOBS PAUL E · CIK 0001191310 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,442

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F2 · shares: The restricted stock units ("RSUs") vested in full on May 15, 2026.

F3 · price: Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001198848-26-000003 · wk-form4_1779224261.xml · derivative · entry 1

DYKSTRA KAREN E · CIK 0001198848 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,802

Underlying: Ordinary Shares · 1,531 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F2 · derivative.exercise_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Ms. Dykstra's service on the Board of Directors pursuant to her election to defer such delivery.

F2 · derivative.expiration_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Ms. Dykstra's service on the Board of Directors pursuant to her election to defer such delivery.

F3 · derivative.underlying: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

SEC source: 0001628280-26-036553 · wk-form4_1779224396.xml · derivative · entry 3

Sine Jeffrey · CIK 0001886826 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,531

Underlying: Ordinary Shares · 1,531 shares

Expires not disclosed

F3 · derivative.exercise_price: Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F4 · derivative.exercise_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc.

F4 · derivative.expiration_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc.

SEC source: 0001628280-26-036553 · wk-form4_1779224396.xml · derivative · entry 2

Sine Jeffrey · CIK 0001886826 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 2,141 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 RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F2 · derivative.exercise_date: The restricted stock units ("RSUs") vested in full on May 15, 2026.

F2 · derivative.expiration_date: The restricted stock units ("RSUs") vested in full on May 15, 2026.

SEC source: 0001628280-26-036553 · wk-form4_1779224396.xml · nonDerivative · entry 1

Sine Jeffrey · CIK 0001886826 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,572

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F2 · shares: The restricted stock units ("RSUs") vested in full on May 15, 2026.

F3 · price: Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001763187-26-000003 · wk-form4_1779224159.xml · derivative · entry 3

Schooler Rosemary · CIK 0001763187 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,531

Underlying: Ordinary Shares · 1,531 shares

Expires not disclosed

F3 · derivative.exercise_price: Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F4 · derivative.exercise_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Ms. Schooler's service on the Board of Directors pursuant to her election to defer such delivery.

F4 · derivative.expiration_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Ms. Schooler's service on the Board of Directors pursuant to her election to defer such delivery.

SEC source: 0001763187-26-000003 · wk-form4_1779224159.xml · derivative · entry 2

Schooler Rosemary · CIK 0001763187 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Ordinary Shares · 2,141 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 RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F2 · derivative.exercise_date: The restricted stock units ("RSUs") vested in full on May 15, 2026.

F2 · derivative.expiration_date: The restricted stock units ("RSUs") vested in full on May 15, 2026.

SEC source: 0001763187-26-000003 · wk-form4_1779224159.xml · nonDerivative · entry 1

Schooler Rosemary · CIK 0001763187 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,572

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 · security: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

F2 · shares: The restricted stock units ("RSUs") vested in full on May 15, 2026.

F3 · price: Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

SEC source: 0001628280-26-036538 · wk-form4_1779224025.xml · derivative · entry 4

SOHN YOUNG · CIK 0001223726 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,531

Underlying: Ordinary Shares · 1,531 shares

Expires not disclosed

F3 · derivative.exercise_price: Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

F5 · derivative.exercise_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Mr. Sohn's service on the Board of Directors pursuant to his election to defer such delivery.

F5 · derivative.expiration_date: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Mr. Sohn's service on the Board of Directors pursuant to his election to defer such delivery.