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Each ADS represents 1 Ordinary Share."},{"field":"kind","element":"transactionCoding","label":"F2","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 10 ordinary shares acquired under the Arm Holdings plc 2024 Employee Stock Purchase Plan on August 31, 2026."}],"balance_after":153442,"source":{"system":"sec-edgar","filing":"0001973239-26-000136","document":"wk-form4_1790197563.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000136/wk-form4_1790197563.xml","form_type":"4"}},{"id":4619859,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":34153,"kind":"person","name":"Abbey William","position":1,"cik":"0001945497","reported_name":"Abbey William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Restricted Stock Units","published_at":"2026-09-16T21:26:59.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":17288,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"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."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F3","text":"Ordinary shares, nominal value 0.001 GBP per share (\"Ordinary Shares\"), are held in the form of American Depositary Shares (\"ADSs\"). 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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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"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. 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Each ADS represents 1 Ordinary Share."},{"field":"kind","element":"transactionCoding","label":"F2","text":"Acquired under the Arm Holdings plc Employee Stock Purchase Plan on August 31, 2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"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."}],"balance_after":338666,"source":{"system":"sec-edgar","filing":"0001973239-26-000130","document":"wk-form4_1789071754.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1998912/000197323926000130/wk-form4_1789071754.xml","form_type":"4"}},{"id":672127,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":18445,"kind":"person","name":"Child Jason","position":1,"cik":"0001533913","reported_name":"Child Jason","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Ordinary Shares","published_at":"2026-08-31T21:06:52.000Z","date":"2026-08-27","kind":"sale","planned":true,"acquired":false,"shares":10400,"price":255.33,"value":2655432.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"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."},{"field":"kind","element":"transactionCoding","label":"F2","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026."}],"balance_after":163832,"source":{"system":"sec-edgar","filing":"0001973239-26-000122","document":"wk-form4_1788210409.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000122/wk-form4_1788210409.xml","form_type":"4"}},{"id":683804,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":22328,"kind":"person","name":"Bartels Laura Kathleen","position":1,"cik":"0002114104","reported_name":"Bartels Laura Kathleen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Restricted Stock Units","published_at":"2026-08-18T21:31:49.000Z","date":"2026-08-17","kind":"exercise","planned":false,"acquired":false,"shares":819,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"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."}],"balance_after":99571,"derivative":{"underlying":"Ordinary Shares","underlying_shares":819},"source":{"system":"sec-edgar","filing":"0001973239-26-000121","document":"wk-form4_1787088706.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000121/wk-form4_1787088706.xml","form_type":"4"}},{"id":683803,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":22328,"kind":"person","name":"Bartels Laura Kathleen","position":1,"cik":"0002114104","reported_name":"Bartels Laura Kathleen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Restricted Stock Units","published_at":"2026-08-18T21:31:49.000Z","date":"2026-08-17","kind":"exercise","planned":false,"acquired":false,"shares":862,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"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."}],"balance_after":100390,"derivative":{"underlying":"Ordinary Shares","underlying_shares":862},"source":{"system":"sec-edgar","filing":"0001973239-26-000121","document":"wk-form4_1787088706.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000121/wk-form4_1787088706.xml","form_type":"4"}},{"id":683802,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":22328,"kind":"person","name":"Bartels Laura Kathleen","position":1,"cik":"0002114104","reported_name":"Bartels Laura Kathleen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Ordinary Shares","published_at":"2026-08-18T21:31:49.000Z","date":"2026-08-17","kind":"tax_withholding","planned":false,"acquired":false,"shares":856,"price":271.43,"value":232344.08,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"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."},{"field":"kind","element":"transactionCoding","label":"F5","text":"Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs."}],"balance_after":12960,"source":{"system":"sec-edgar","filing":"0001973239-26-000121","document":"wk-form4_1787088706.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000121/wk-form4_1787088706.xml","form_type":"4"}},{"id":683801,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":22328,"kind":"person","name":"Bartels Laura Kathleen","position":1,"cik":"0002114104","reported_name":"Bartels Laura Kathleen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Ordinary Shares","published_at":"2026-08-18T21:31:49.000Z","date":"2026-08-17","kind":"exercise","planned":false,"acquired":true,"shares":819,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"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."},{"field":"shares","element":"transactionShares","label":"F4","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS."}],"balance_after":13816,"source":{"system":"sec-edgar","filing":"0001973239-26-000121","document":"wk-form4_1787088706.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000121/wk-form4_1787088706.xml","form_type":"4"}},{"id":683800,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":22328,"kind":"person","name":"Bartels Laura Kathleen","position":1,"cik":"0002114104","reported_name":"Bartels Laura Kathleen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Ordinary Shares","published_at":"2026-08-18T21:31:49.000Z","date":"2026-08-17","kind":"exercise","planned":false,"acquired":true,"shares":862,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"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."},{"field":"shares","element":"transactionShares","label":"F2","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS."}],"balance_after":12997,"source":{"system":"sec-edgar","filing":"0001973239-26-000121","document":"wk-form4_1787088706.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000121/wk-form4_1787088706.xml","form_type":"4"}},{"id":690923,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":24654,"kind":"person","name":"Sine Jeffrey","position":1,"cik":"0001886826","reported_name":"Sine Jeffrey","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2026-08-11T20:21:34.000Z","date":"2026-08-07","kind":"gift","planned":false,"acquired":false,"shares":9572,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"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."},{"field":"shares","element":"transactionShares","label":"F2","text":"The reporting\tperson transferred 9,572 ADSs to a charitable donor-advised fund."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001973239-26-000119","document":"wk-form4_1786479685.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000119/wk-form4_1786479685.xml","form_type":"4"}},{"id":749837,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":22328,"kind":"person","name":"Bartels Laura Kathleen","position":1,"cik":"0002114104","reported_name":"Bartels Laura Kathleen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Ordinary Shares","published_at":"2026-06-04T21:05:42.000Z","date":"2026-06-02","kind":"sale","planned":false,"acquired":false,"shares":11306,"price":392.7,"value":4439866.2,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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."}],"balance_after":12135,"source":{"system":"sec-edgar","filing":"0001973239-26-000107","document":"wk-form4_1780607139.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000107/wk-form4_1780607139.xml","form_type":"4"}},{"id":752206,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":34153,"kind":"person","name":"Abbey William","position":1,"cik":"0001945497","reported_name":"Abbey William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Ordinary Shares","published_at":"2026-06-03T20:46:30.000Z","date":"2026-06-01","kind":"sale","planned":false,"acquired":false,"shares":3922,"price":415.52,"value":1629669.44,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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."}],"balance_after":20563,"source":{"system":"sec-edgar","filing":"0001973239-26-000105","document":"wk-form4_1780519586.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000105/wk-form4_1780519586.xml","form_type":"4"}},{"id":752205,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":34153,"kind":"person","name":"Abbey William","position":1,"cik":"0001945497","reported_name":"Abbey William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Ordinary Shares","published_at":"2026-06-03T20:46:30.000Z","date":"2026-06-01","kind":"sale","planned":false,"acquired":false,"shares":2644,"price":383.73,"value":1014582.12,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Ordinary shares, nominal value 0.001 GBP per share (\"Ordinary Shares\"), are held in the form of American Depositary Shares (\"ADSs\"). 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Each ADS represents 1 Ordinary Share."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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."}],"balance_after":27129,"source":{"system":"sec-edgar","filing":"0001973239-26-000103","document":"wk-form4_1780345980.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1973239/000197323926000103/wk-form4_1780345980.xml","form_type":"4"}},{"id":764079,"issuer":{"id":2828,"kind":"organization","name":"ARM HOLDINGS PLC /UK","symbol":"ARM"},"owners":[{"id":34153,"kind":"person","name":"Abbey William","position":1,"cik":"0001945497","reported_name":"Abbey William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Ordinary Shares","published_at":"2026-05-26T22:01:08.000Z","date":"2026-05-22","kind":"sale","planned":false,"acquired":false,"shares":2300,"price":305.82,"value":703386.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents weighted average sales price. The shares were sold at prices ranging from $305.82 to $305.91. 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