ARM

SEC source: 0001973239-26-000136 · wk-form4_1790197563.xml · nonDerivative · entry 1

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 153,442

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 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026.

F3 · balance_after: Includes 10 ordinary shares acquired under the Arm Holdings plc 2024 Employee Stock Purchase Plan on August 31, 2026.

SEC source: 0001973239-26-000133 · wk-form4_1789594015.xml · derivative · entry 1

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,270

Underlying: Ordinary Shares · 17,288 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: This RSU award was granted effective September 14, 2026. 50% will vest on each of August 15, 2028 and August 15, 2029, subject to continued service to Arm Holdings plc.

F2 · derivative.expiration_date: This RSU award was granted effective September 14, 2026. 50% will vest on each of August 15, 2028 and August 15, 2029, subject to continued service to Arm Holdings plc.

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: 0001973239-26-000130 · wk-form4_1789071754.xml · derivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 425,000

Underlying: Ordinary Shares · 425,000 shares

Expires not disclosed

F5 · 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 in May 2026, subject to shareholder approval, which was obtained on September 9, 2026. This award has three tranches, each contingent on achieving market capitalization milestones: $1.0 trillion by March 31, 2029, $1.5 trillion by March 31, 2030, and $2.0 trillion by March 31, 2031. 25% of the VCP award is tied to each interim milestone, with the remaining 50% tied to the final milestone. If an interim milestone is not achieved within the specified timeframe, the associated portion will roll forward and remain eligible for vesting upon achievement of a subsequent milestone. Achievement of the milestones will be determined based on the rolling average closing price over any 60-day period prior to the relevant milestone date. If a milestone is achieved, vesting of the associated RSUs will occur on April 1, two years following the relevant milestone date, subject to continued employment.

F6 · derivative.expiration_date: This RSU award was granted in May 2026, subject to shareholder approval, which was obtained on September 9, 2026. This award has three tranches, each contingent on achieving market capitalization milestones: $1.0 trillion by March 31, 2029, $1.5 trillion by March 31, 2030, and $2.0 trillion by March 31, 2031. 25% of the VCP award is tied to each interim milestone, with the remaining 50% tied to the final milestone. If an interim milestone is not achieved within the specified timeframe, the associated portion will roll forward and remain eligible for vesting upon achievement of a subsequent milestone. Achievement of the milestones will be determined based on the rolling average closing price over any 60-day period prior to the relevant milestone date. If a milestone is achieved, vesting of the associated RSUs will occur on April 1, two years following the relevant milestone date, subject to continued employment.

SEC source: 0001973239-26-000130 · wk-form4_1789071754.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 338,666

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 · kind: Acquired under the Arm Holdings plc Employee Stock Purchase Plan on August 31, 2026.

F3 · balance_after: The number of shares held reflects the transfer, on September 9, 2026, of 57,405 Ordinary Shares from the Reporting Person to a grantor retained annuity trust, of which the Reporting Person serves as trustee.

SEC source: 0001973239-26-000122 · wk-form4_1788210409.xml · nonDerivative · entry 1

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 163,832

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 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026.

SEC source: 0001973239-26-000121 · wk-form4_1787088706.xml · derivative · entry 5

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 99,571

Underlying: Ordinary Shares · 819 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.

F4 · derivative.exercise_date: This RSU award was granted on May 1, 2025, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

F4 · derivative.expiration_date: This RSU award was granted on May 1, 2025, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

SEC source: 0001973239-26-000121 · wk-form4_1787088706.xml · derivative · entry 4

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,390

Underlying: Ordinary Shares · 862 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: This restricted stock unit ("RSU") award was granted on May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

F2 · derivative.expiration_date: This restricted stock unit ("RSU") award was granted on May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

SEC source: 0001973239-26-000121 · wk-form4_1787088706.xml · nonDerivative · entry 3

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,960

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: 0001973239-26-000121 · wk-form4_1787088706.xml · nonDerivative · entry 2

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,816

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, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

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

SEC source: 0001973239-26-000121 · wk-form4_1787088706.xml · nonDerivative · entry 1

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,997

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: This restricted stock unit ("RSU") award was granted on May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

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

SEC source: 0001973239-26-000119 · wk-form4_1786479685.xml · nonDerivative · entry 1

Sine Jeffrey · CIK 0001886826 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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 reporting person transferred 9,572 ADSs to a charitable donor-advised fund.

SEC source: 0001973239-26-000107 · wk-form4_1780607139.xml · nonDerivative · entry 1

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,135

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 · price: Represents weighted average sales price. The shares were sold at prices ranging from $392.60 to $393.09. 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: 0001973239-26-000105 · wk-form4_1780519586.xml · nonDerivative · entry 2

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,563

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 · price: Represents weighted average sales price. The shares were sold at prices ranging from $415.52 to $415.58. 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: 0001973239-26-000105 · wk-form4_1780519586.xml · nonDerivative · entry 1

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,485

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.

SEC source: 0001973239-26-000103 · wk-form4_1780345980.xml · nonDerivative · entry 1

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,129

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 · price: Represents weighted average sales price. The shares were sold at prices ranging from $343.80 to $344.09. 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: 0001973239-26-000101 · wk-form4_1779832863.xml · nonDerivative · entry 1

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,329

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 · price: Represents weighted average sales price. The shares were sold at prices ranging from $305.82 to $305.91. 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: 0001973239-26-000082 · wk-form4_1779394330.xml · nonDerivative · entry 2

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,805

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.

F3 · price: Represents weighted average sales price. The shares were sold at prices ranging from $282.71 to $282.86. 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: 0001973239-26-000089 · wk-form4_1779485003.xml · nonDerivative · entry 2

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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 · price: Represents weighted average sales price. The shares were sold at prices ranging from $291.04 to $291.08. 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: 0001973239-26-000089 · wk-form4_1779485003.xml · nonDerivative · entry 1

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,000

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.

SEC source: 0001973239-26-000091 · wk-form4_1779485089.xml · nonDerivative · entry 1

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,629

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 · price: Represents weighted average sales price. The shares were sold at prices ranging from $287.02 to $287.15. 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: 0001973239-26-000084 · wk-form4_1779394526.xml · nonDerivative · entry 2

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,284

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.

F3 · price: Represents weighted average sales price. The shares were sold at prices ranging from $257.15 to $257.35. 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: 0001533913-26-000009 · wk-form4_1779394413.xml · nonDerivative · entry 1

Child Jason · CIK 0001533913 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 174,232

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 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 30, 2025.

SEC source: 0001973239-26-000082 · wk-form4_1779394330.xml · nonDerivative · entry 1

Eaton Charlotte Claire · CIK 0002102441 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,805

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 · price: Represents weighted average sales price. The shares were sold at prices ranging from $252.20 to $252.28. 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: 0001973239-26-000086 · wk-form4_1779394606.xml · nonDerivative · entry 1

Collins Spencer · CIK 0001999165 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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.

SEC source: 0001973239-26-000084 · wk-form4_1779394526.xml · nonDerivative · entry 1

Abbey William · CIK 0001945497 · Chief Commercial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,353

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 · price: Represents weighted average sales price. The shares were sold at prices ranging from $224.11 to $224.43. 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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 9

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

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 $209.03 to $209.66. 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: 0001973239-26-000068 · wk-form4_1779224529.xml · derivative · entry 1

FISHER RONALD D · CIK 0001065266 · 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 Mr. Fisher's service on the Board of Directors pursuant to his 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 Mr. Fisher's service on the Board of Directors pursuant to his 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: 0001973239-26-000080 · wk-form4_1779225948.xml · derivative · entry 9

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,252

Underlying: Ordinary Shares · 2,308 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.

F5 · derivative.exercise_date: This RSU award was granted on May 22, 2023, 28.5% of which vested on May 15, 2024, with quarterly vesting of 6.5% thereafter. The RSU award was fully vested on May 15, 2026.

F5 · derivative.expiration_date: This RSU award was granted on May 22, 2023, 28.5% of which vested on May 15, 2024, with quarterly vesting of 6.5% thereafter. The RSU award was fully vested on May 15, 2026.

SEC source: 0001973239-26-000080 · wk-form4_1779225948.xml · derivative · entry 8

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,560

Underlying: Ordinary Shares · 862 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.

F4 · derivative.exercise_date: This RSU award was granted on May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

F4 · derivative.expiration_date: This RSU award was granted on May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

SEC source: 0001973239-26-000080 · wk-form4_1779225948.xml · derivative · entry 7

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 104,422

Underlying: Ordinary Shares · 3,588 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: This restricted stock unit ("RSU") award was granted on May 1, 2025, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

F2 · derivative.expiration_date: This restricted stock unit ("RSU") award was granted on May 1, 2025, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

SEC source: 0001973239-26-000080 · wk-form4_1779225948.xml · derivative · entry 6

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,010

Underlying: Ordinary Shares · 69,570 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.

F8 · derivative.exercise_date: This RSU award was granted effective May 15, 2026, 50% will vest on each of May 15, 2028 and May 15, 2029, subject to continued service to the Company.

F8 · derivative.expiration_date: This RSU award was granted effective May 15, 2026, 50% will vest on each of May 15, 2028 and May 15, 2029, subject to continued service to the Company.

SEC source: 0001973239-26-000080 · wk-form4_1779225948.xml · derivative · entry 5

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,440

Underlying: Ordinary Shares · 16,645 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.

F7 · derivative.exercise_date: This RSU award was granted effective May 15, 2026, 28.5% will vest on May 15, 2027, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

F7 · derivative.expiration_date: This RSU award was granted effective May 15, 2026, 28.5% will vest on May 15, 2027, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

SEC source: 0001973239-26-000080 · wk-form4_1779225948.xml · nonDerivative · entry 4

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,441

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: 0001973239-26-000080 · wk-form4_1779225948.xml · nonDerivative · entry 3

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,824

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 22, 2023, 28.5% of which vested on May 15, 2024, with quarterly vesting of 6.5% thereafter. The RSU award was fully vested 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: 0001973239-26-000080 · wk-form4_1779225948.xml · nonDerivative · entry 2

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,516

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 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

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

SEC source: 0001973239-26-000080 · wk-form4_1779225948.xml · nonDerivative · entry 1

Bartels Laura Kathleen · CIK 0002114104 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,654

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: This restricted stock unit ("RSU") award was granted on May 1, 2025, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

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

SEC source: 0001973239-26-000076 · wk-form4_1779225623.xml · derivative · entry 15

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 118,443

Underlying: Ordinary Shares · 4,352 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: 0001973239-26-000076 · wk-form4_1779225623.xml · derivative · entry 14

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 122,795

Underlying: Ordinary Shares · 1,631 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: 0001973239-26-000076 · wk-form4_1779225623.xml · derivative · entry 13

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 124,426

Underlying: Ordinary Shares · 14,595 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: 0001973239-26-000076 · wk-form4_1779225623.xml · derivative · entry 12

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,021

Underlying: Ordinary Shares · 2,046 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: 0001973239-26-000076 · wk-form4_1779225623.xml · derivative · entry 11

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 141,067

Underlying: Ordinary Shares · 34,785 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. 50% will vest on each of May 15, 2028 and May 15, 2029, subject to continued service to the Company.

F12 · derivative.expiration_date: This RSU award was granted effective May 15, 2026. 50% will vest on each of May 15, 2028 and May 15, 2029, subject to continued service to the Company.

SEC source: 0001973239-26-000076 · wk-form4_1779225623.xml · derivative · entry 10

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 106,282

Underlying: Ordinary Shares · 6,648 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.

F11 · 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.

F11 · 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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 8

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,339

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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 7

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,640

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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 6

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,288

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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 5

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,973

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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 4

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,342

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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 3

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,184

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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 2

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,589

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: 0001973239-26-000076 · wk-form4_1779225623.xml · nonDerivative · entry 1

Grisenthwaite Richard Roy · CIK 0002112445 · Chief Architect

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,543

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.