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the Agreement and Plan of Merger, dated February 22, 2026 (the \"Merger Agreement\"), by and among Arcellx, Inc. (\"Company\"), Gilead Sciences, Inc. (\"Parent\"), and Ravens Sub, Inc., a wholly owned subsidiary of Parent (\"Purchaser\"), the shares of common stock of Company that were tendered to Purchaser prior to the expiration time of the offer were exchanged for (x) $115.00 per share (\"Closing Amount\"), net to the seller in cash, without interest, subject to withholding tax, plus (y) one contractual contingent value right (a \"CVR\"), which represents the right to receive one contingent payment of $5.00 per CVR in cash, without interest, and subject to any withholding tax, pursuant to the terms and subject to the conditions of a contingent value rights agreement. 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The Reporting Person has voting and investment power over all securities owned by the foundation."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001930862-26-000008","document":"form4-04282026_080443.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000193086226000008/form4-04282026_080443.xml","form_type":"4"}},{"id":798555,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-04-28T20:25:47.000Z","date":"2026-04-28","kind":"other","planned":false,"acquired":false,"shares":67048,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Pursuant to the Agreement and Plan of Merger, dated February 22, 2026 (the \"Merger Agreement\"), by and among Arcellx, Inc. (\"Company\"), Gilead Sciences, Inc. (\"Parent\"), and Ravens Sub, Inc., a wholly owned subsidiary of Parent (\"Purchaser\"), the shares of common stock of Company that were tendered to Purchaser prior to the expiration time of the offer were exchanged for (x) $115.00 per share (\"Closing Amount\"), net to the seller in cash, without interest, subject to withholding tax, plus (y) one contractual contingent value right (a \"CVR\"), which represents the right to receive one contingent payment of $5.00 per CVR in cash, without interest, and subject to any withholding tax, pursuant to the terms and subject to the conditions of a contingent value rights agreement. 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Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, twenty-five percent (25%) of the shares subject to the Option shall vest on the one (1) year anniversary of the Vesting Commencement Date, and one forty-eighth (1/48th) of the shares subject to the Option shall vest each month thereafter on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month), \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":42315,"derivative":{"exercise_price":8.66,"expiration_date":"2032-05-23","underlying":"Common Stock","underlying_shares":36000},"source":{"system":"sec-edgar","filing":"0001193125-26-161748","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526161748/ownership.xml","form_type":"4"}},{"id":805039,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-04-17T21:00:14.000Z","date":"2026-04-16","kind":"exercise","planned":false,"acquired":true,"shares":2110,"price":8.66,"value":18272.6,"ownership":{"direct":true},"balance_after":67048,"source":{"system":"sec-edgar","filing":"0001193125-26-161748","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526161748/ownership.xml","form_type":"4"}},{"id":805038,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-04-17T21:00:14.000Z","date":"2026-04-15","kind":"exercise","planned":false,"acquired":true,"shares":36000,"price":8.66,"value":311760.0,"ownership":{"direct":true},"balance_after":64938,"source":{"system":"sec-edgar","filing":"0001193125-26-161748","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526161748/ownership.xml","form_type":"4"}},{"id":833101,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-03-19T22:26:45.000Z","date":"2026-03-17","kind":"gift","planned":false,"acquired":false,"shares":5000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F1","text":"On March 17, 2026, the Reporting Person transferred, for no consideration, 5,000 shares to a family charitable foundation of which the Reporting Person serves as the President. 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The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":33938,"source":{"system":"sec-edgar","filing":"0001193125-26-072579","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526072579/ownership.xml","form_type":"4"}},{"id":881312,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-02-26T00:51:45.000Z","date":"2026-01-06","kind":"exercise","planned":false,"acquired":true,"shares":20530,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock. Vesting of these RSUs previously reported in the Form 4 filed January 6, 2026."}],"balance_after":64832,"source":{"system":"sec-edgar","filing":"0001193125-26-072579","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526072579/ownership.xml","form_type":"4"}},{"id":892418,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-02-19T23:26:34.000Z","date":"2026-02-19","kind":"sale","planned":false,"acquired":false,"shares":100,"price":69.38,"value":6938.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units."}],"balance_after":45157,"source":{"system":"sec-edgar","filing":"0001193125-26-059840","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526059840/ownership.xml","form_type":"4"}},{"id":892417,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-02-19T23:26:34.000Z","date":"2026-02-19","kind":"sale","planned":false,"acquired":false,"shares":5405,"price":68.5726,"value":370634.903,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Represents the weighted average share price of an aggregate total of 5,405 shares sold in the price range of $68.17 to $69.04 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":45257,"source":{"system":"sec-edgar","filing":"0001193125-26-059840","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526059840/ownership.xml","form_type":"4"}},{"id":892416,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-02-19T23:26:34.000Z","date":"2026-02-19","kind":"sale","planned":false,"acquired":false,"shares":2879,"price":67.7301,"value":194994.9579,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average share price of an aggregate total of 2,879 shares sold in the price range of $67.09 to $68.08 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":50662,"source":{"system":"sec-edgar","filing":"0001193125-26-059840","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526059840/ownership.xml","form_type":"4"}},{"id":892415,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-02-19T23:26:34.000Z","date":"2026-01-03","kind":"exercise","planned":false,"acquired":true,"shares":15340,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock. 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2025."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-fourth (1/4th) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over four (4) years. \"RSU Grant Date\" shall mean January 6, 2025."}],"balance_after":61590,"derivative":{"underlying":"Common 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restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 3, 2023."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 3, 2023."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":15340},"source":{"system":"sec-edgar","filing":"0001193125-26-005085","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526005085/ownership.xml","form_type":"4"}},{"id":945528,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Restricted Stock Unit","published_at":"2026-01-07T01:14:35.000Z","date":"2026-01-02","kind":"exercise","planned":false,"acquired":false,"shares":20496,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 2, 2024."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 2, 2024."}],"balance_after":20496,"derivative":{"underlying":"Common Stock","underlying_shares":20496},"source":{"system":"sec-edgar","filing":"0001193125-26-005085","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526005085/ownership.xml","form_type":"4"}},{"id":945527,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Restricted Stock Unit","published_at":"2026-01-07T01:14:35.000Z","date":"2026-01-02","kind":"grant","planned":false,"acquired":true,"shares":88542,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-fourth (1/4th) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over four (4) years. \"RSU Grant Date\" shall mean January 2, 2026."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-fourth (1/4th) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over four (4) years. \"RSU Grant Date\" shall mean January 2, 2026."}],"balance_after":88542,"derivative":{"underlying":"Common Stock","underlying_shares":88542},"source":{"system":"sec-edgar","filing":"0001193125-26-005085","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526005085/ownership.xml","form_type":"4"}},{"id":945526,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-01-07T01:14:35.000Z","date":"2026-01-06","kind":"exercise","planned":false,"acquired":true,"shares":20530,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":64832,"source":{"system":"sec-edgar","filing":"0001193125-26-005085","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526005085/ownership.xml","form_type":"4"}},{"id":945525,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-01-07T01:14:35.000Z","date":"2026-01-03","kind":"exercise","planned":false,"acquired":true,"shares":15340,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":44302,"source":{"system":"sec-edgar","filing":"0001193125-26-005085","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526005085/ownership.xml","form_type":"4"}},{"id":945524,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-01-07T01:14:35.000Z","date":"2026-01-02","kind":"exercise","planned":false,"acquired":true,"shares":20496,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":28962,"source":{"system":"sec-edgar","filing":"0001193125-26-005085","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312526005085/ownership.xml","form_type":"4"}},{"id":1018234,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-10-15T23:28:24.000Z","date":"2025-10-15","kind":"sale","planned":true,"acquired":false,"shares":5364,"price":91.0357,"value":488315.4948,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on March 21, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the weighted average share price of an aggregate total of 5,364 shares sold in the price range of $90.99 to $91.19 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":8466,"source":{"system":"sec-edgar","filing":"0001193125-25-240536","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312525240536/ownership.xml","form_type":"4"}},{"id":1022795,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-10-06T23:21:54.000Z","date":"2025-10-06","kind":"sale","planned":true,"acquired":false,"shares":1064,"price":86.2155,"value":91733.292,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on March 21, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average share price of an aggregate total of 1,064 shares sold in the price range of $86.05 to $86.435 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":13830,"source":{"system":"sec-edgar","filing":"0001193125-25-232216","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312525232216/ownership.xml","form_type":"4"}},{"id":1022794,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-10-06T23:21:54.000Z","date":"2025-10-03","kind":"sale","planned":true,"acquired":false,"shares":4882,"price":86.0036,"value":419869.5752,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on March 21, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the weighted average share price of an aggregate total of 4,882 shares sold in the price range of $85.99 to $86.20 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":14894,"source":{"system":"sec-edgar","filing":"0001193125-25-232216","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000119312525232216/ownership.xml","form_type":"4"}},{"id":1131503,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Restricted Stock Units","published_at":"2025-05-29T00:18:05.000Z","date":"2025-05-23","kind":"exercise","planned":false,"acquired":false,"shares":22429,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, the RSUs shall vest annually over three (3) years with a cliff every twelve (12) months on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). \"Vesting Commencement Date\" shall mean May 23, 2022."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, the RSUs shall vest annually over three (3) years with a cliff every twelve (12) months on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":22429},"source":{"system":"sec-edgar","filing":"0000950170-25-078529","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000095017025078529/ownership.xml","form_type":"4"}},{"id":1131502,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-05-29T00:18:05.000Z","date":"2025-05-27","kind":"sale","planned":false,"acquired":false,"shares":8449,"price":64.3755,"value":543908.5995,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents the number of shares sold to cover the tax withholding obligations in connection with the vesting of RSUs and does not represent a discretionary sale by the Reporting Person."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Represents the weighted average share price of an aggregate total of 8,449 shares sold in the price range of $63.925 to $ 64.785 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":19776,"source":{"system":"sec-edgar","filing":"0000950170-25-078529","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000095017025078529/ownership.xml","form_type":"4"}},{"id":1131501,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-05-29T00:18:05.000Z","date":"2025-05-27","kind":"sale","planned":false,"acquired":false,"shares":3786,"price":63.6207,"value":240867.9702,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents the number of shares sold to cover the tax withholding obligations in connection with the vesting of RSUs and does not represent a discretionary sale by the Reporting Person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average share price of an aggregate total of 3,786 shares sold in the price range of $62.935 to $63.925 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":28225,"source":{"system":"sec-edgar","filing":"0000950170-25-078529","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000095017025078529/ownership.xml","form_type":"4"}},{"id":1131500,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-05-29T00:18:05.000Z","date":"2025-05-23","kind":"exercise","planned":false,"acquired":true,"shares":22429,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock."}],"balance_after":32011,"source":{"system":"sec-edgar","filing":"0000950170-25-078529","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000095017025078529/ownership.xml","form_type":"4"}},{"id":1304855,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Restricted Stock Unit","published_at":"2025-01-11T02:36:34.000Z","date":"2025-01-03","kind":"exercise","planned":true,"acquired":false,"shares":15339,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock.  Vesting of these RSUs previously reported in the Form 4 filed January 6, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F9","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 3, 2023."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F9","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 3, 2023."}],"balance_after":15340,"derivative":{"underlying":"Common Stock","underlying_shares":15339},"source":{"system":"sec-edgar","filing":"0001415889-25-001345","document":"form4-01112025_020131.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001345/form4-01112025_020131.xml","form_type":"4"}},{"id":1304854,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:36:34.000Z","date":"2025-01-08","kind":"sale","planned":true,"acquired":false,"shares":3997,"price":73.6929,"value":294550.5213,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported reflects the weighted average sales price. These shares were sold in multiple transactions at prices that were not available from the broker at the time of filing. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":9582,"source":{"system":"sec-edgar","filing":"0001415889-25-001345","document":"form4-01112025_020131.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001345/form4-01112025_020131.xml","form_type":"4"}},{"id":1304853,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:36:34.000Z","date":"2025-01-07","kind":"sale","planned":true,"acquired":false,"shares":4760,"price":75.5283,"value":359514.708,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F7","text":"Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported reflects the weighted average sales price. These shares were sold in multiple transactions at prices that were not available from the broker at the time of filing. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":13579,"source":{"system":"sec-edgar","filing":"0001415889-25-001345","document":"form4-01112025_020131.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001345/form4-01112025_020131.xml","form_type":"4"}},{"id":1304852,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:36:34.000Z","date":"2025-01-07","kind":"sale","planned":true,"acquired":false,"shares":2327,"price":77.0605,"value":179319.7835,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"Represents the weighted average share price of an aggregate total of 2,327 shares sold in the price range of $76.93 to $77.16 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":18339,"source":{"system":"sec-edgar","filing":"0001415889-25-001345","document":"form4-01112025_020131.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001345/form4-01112025_020131.xml","form_type":"4"}},{"id":1304851,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:36:34.000Z","date":"2025-01-07","kind":"sale","planned":true,"acquired":false,"shares":2251,"price":76.6422,"value":172521.5922,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"Represents the weighted average share price of an aggregate total of 2,251 shares sold in the price range of $75.93 to $76.91 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":20666,"source":{"system":"sec-edgar","filing":"0001415889-25-001345","document":"form4-01112025_020131.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001345/form4-01112025_020131.xml","form_type":"4"}},{"id":1304850,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:36:34.000Z","date":"2025-01-07","kind":"sale","planned":true,"acquired":false,"shares":1546,"price":75.2333,"value":116310.6818,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Represents the weighted average share price of an aggregate total of 1,546 shares sold in the price range of $74.85 to $75.73 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":22917,"source":{"system":"sec-edgar","filing":"0001415889-25-001345","document":"form4-01112025_020131.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001345/form4-01112025_020131.xml","form_type":"4"}},{"id":1304849,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:36:34.000Z","date":"2025-01-07","kind":"sale","planned":true,"acquired":false,"shares":3128,"price":74.4268,"value":232807.0304,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average share price of an aggregate total of 3,128 shares sold in the price range of $73.80 to $74.74 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":24463,"source":{"system":"sec-edgar","filing":"0001415889-25-001345","document":"form4-01112025_020131.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001345/form4-01112025_020131.xml","form_type":"4"}},{"id":1304848,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:36:34.000Z","date":"2025-01-03","kind":"exercise","planned":true,"acquired":true,"shares":15339,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock.  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Vesting of these RSUs previously reported in the Form 4 filed January 6, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 2, 2024."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 2, 2024."}],"balance_after":40992,"derivative":{"underlying":"Common Stock","underlying_shares":20495},"source":{"system":"sec-edgar","filing":"0001415889-25-001341","document":"form4a-01112025_020153.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001341/form4a-01112025_020153.xml","form_type":"4/A","original_submission_date":"2025-01-06"}},{"id":1304842,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:28:56.000Z","date":"2025-01-06","kind":"sale","planned":false,"acquired":false,"shares":5621,"price":77.1668,"value":433754.5828,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"shares","element":"transactionShares","label":"F3","text":"Amendment filed to report the correct number of shares sold to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units reported in the Form 4 filed on January 6, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported reflects the weighted average sales price. These shares were sold in multiple transactions at prices that were not available from the broker at the time of filing. 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These shares were sold in multiple transactions at prices that were not available from the broker at the time of filing. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":33212,"source":{"system":"sec-edgar","filing":"0001415889-25-001341","document":"form4a-01112025_020153.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001341/form4a-01112025_020153.xml","form_type":"4/A","original_submission_date":"2025-01-06"}},{"id":1304840,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2025-01-11T02:28:56.000Z","date":"2025-01-02","kind":"exercise","planned":false,"acquired":true,"shares":20495,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock.  Vesting of these RSUs previously reported in the Form 4 filed January 6, 2025."}],"balance_after":23495,"source":{"system":"sec-edgar","filing":"0001415889-25-001341","document":"form4a-01112025_020153.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925001341/form4a-01112025_020153.xml","form_type":"4/A","original_submission_date":"2025-01-06"}},{"id":1309545,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Restricted Stock 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2023."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 3, 2023."}],"balance_after":15340,"derivative":{"underlying":"Common 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These shares were sold in multiple transactions at prices that were not available from the broker at the time of filing. 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These shares were sold in multiple transactions at prices that were not available from the broker at the time of filing. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":33332,"source":{"system":"sec-edgar","filing":"0001415889-25-000952","document":"form4-01072025_020104.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588925000952/form4-01072025_020104.xml","form_type":"4"}},{"id":1309540,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common 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the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":78315,"derivative":{"exercise_price":8.66,"expiration_date":"2032-05-23","underlying":"Common Stock","underlying_shares":3000},"source":{"system":"sec-edgar","filing":"0001415889-24-027269","document":"form4-11192024_111127.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924027269/form4-11192024_111127.xml","form_type":"4"}},{"id":1358188,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL 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2024."}],"balance_after":100,"source":{"system":"sec-edgar","filing":"0001415889-24-027269","document":"form4-11192024_111127.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924027269/form4-11192024_111127.xml","form_type":"4"}},{"id":1358185,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-11-19T23:46:31.000Z","date":"2024-11-15","kind":"sale","planned":true,"acquired":false,"shares":500,"price":89.172,"value":44586.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average share price of an aggregate total of 500 shares sold in the price range of $88.74 to $89.66 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":200,"source":{"system":"sec-edgar","filing":"0001415889-24-027269","document":"form4-11192024_111127.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924027269/form4-11192024_111127.xml","form_type":"4"}},{"id":1358184,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-11-19T23:46:31.000Z","date":"2024-11-15","kind":"sale","planned":true,"acquired":false,"shares":1061,"price":87.8939,"value":93255.4279,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the weighted average share price of an aggregate total of 1,061 shares sold in the price range of $87.36 to $88.22 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":700,"source":{"system":"sec-edgar","filing":"0001415889-24-027269","document":"form4-11192024_111127.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924027269/form4-11192024_111127.xml","form_type":"4"}},{"id":1368053,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Stock Option (right to buy)","published_at":"2024-11-13T01:31:20.000Z","date":"2024-11-08","kind":"exercise","planned":true,"acquired":false,"shares":7200,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, twenty-five percent (25%) of the shares subject to the Option shall vest on the one (1) year anniversary of the Vesting Commencement Date, and one forty-eighth (1/48th) of the shares subject to the Option shall vest each month thereafter on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month), \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":81315,"derivative":{"exercise_price":8.66,"expiration_date":"2032-05-23","underlying":"Common Stock","underlying_shares":7200},"source":{"system":"sec-edgar","filing":"0001415889-24-026655","document":"form4-11132024_011117.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924026655/form4-11132024_011117.xml","form_type":"4"}},{"id":1368052,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-11-13T01:31:20.000Z","date":"2024-11-08","kind":"sale","planned":true,"acquired":false,"shares":801,"price":102.3348,"value":81970.1748,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Represents the weighted average share price of an aggregate total of 801 shares sold in the price range of $102.055 to $102.56 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":1761,"source":{"system":"sec-edgar","filing":"0001415889-24-026655","document":"form4-11132024_011117.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924026655/form4-11132024_011117.xml","form_type":"4"}},{"id":1368051,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-11-13T01:31:20.000Z","date":"2024-11-08","kind":"sale","planned":true,"acquired":false,"shares":1853,"price":101.2662,"value":187646.2686,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average share price of an aggregate total of 1,853 shares sold in the price range of $101.03 to $101.99 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":2562,"source":{"system":"sec-edgar","filing":"0001415889-24-026655","document":"form4-11132024_011117.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924026655/form4-11132024_011117.xml","form_type":"4"}},{"id":1368050,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-11-13T01:31:20.000Z","date":"2024-11-08","kind":"sale","planned":true,"acquired":false,"shares":9700,"price":100.2633,"value":972554.01,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the weighted average share price of an aggregate total of 9,700 shares sold in the price range of $99.99 to $100.98 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":4415,"source":{"system":"sec-edgar","filing":"0001415889-24-026655","document":"form4-11132024_011117.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924026655/form4-11132024_011117.xml","form_type":"4"}},{"id":1368049,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-11-13T01:31:20.000Z","date":"2024-11-08","kind":"exercise","planned":true,"acquired":true,"shares":7200,"price":8.66,"value":62352.0,"ownership":{"direct":true},"balance_after":14115,"source":{"system":"sec-edgar","filing":"0001415889-24-026655","document":"form4-11132024_011117.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924026655/form4-11132024_011117.xml","form_type":"4"}},{"id":1404426,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Stock Option (right to buy)","published_at":"2024-09-18T00:54:52.000Z","date":"2024-09-17","kind":"exercise","planned":true,"acquired":false,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, twenty-five percent (25%) of the shares subject to the Option shall vest on the one (1) year anniversary of the Vesting Commencement Date, and one forty-eighth (1/48th) of the shares subject to the Option shall vest each month thereafter on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month), \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":88515,"derivative":{"exercise_price":8.66,"expiration_date":"2032-05-23","underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001415889-24-023587","document":"form4-09182024_120949.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924023587/form4-09182024_120949.xml","form_type":"4"}},{"id":1404425,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-09-18T00:54:52.000Z","date":"2024-09-17","kind":"sale","planned":true,"acquired":false,"shares":8726,"price":77.8809,"value":679588.7334,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average share price of an aggregate total of 8,726 shares sold in the price range of $77.70 to $78.30 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":6915,"source":{"system":"sec-edgar","filing":"0001415889-24-023587","document":"form4-09182024_120949.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924023587/form4-09182024_120949.xml","form_type":"4"}},{"id":1404424,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-09-18T00:54:52.000Z","date":"2024-09-17","kind":"sale","planned":true,"acquired":false,"shares":6274,"price":77.5089,"value":486290.8386,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the weighted average share price of an aggregate total of 6,274 shares sold in the price range of $76.70 to $77.69 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":15641,"source":{"system":"sec-edgar","filing":"0001415889-24-023587","document":"form4-09182024_120949.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924023587/form4-09182024_120949.xml","form_type":"4"}},{"id":1404423,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-09-18T00:54:52.000Z","date":"2024-09-17","kind":"exercise","planned":true,"acquired":true,"shares":15000,"price":8.66,"value":129900.0,"ownership":{"direct":true},"balance_after":21915,"source":{"system":"sec-edgar","filing":"0001415889-24-023587","document":"form4-09182024_120949.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924023587/form4-09182024_120949.xml","form_type":"4"}},{"id":1466950,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-06-28T20:06:40.000Z","date":"2024-06-26","kind":"sale","planned":true,"acquired":false,"shares":551,"price":54.249,"value":29891.199,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average share price of an aggregate total of 551 shares sold in the price range of $54.18 to $54.44 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":6915,"source":{"system":"sec-edgar","filing":"0001415889-24-018407","document":"form4-06282024_080637.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924018407/form4-06282024_080637.xml","form_type":"4"}},{"id":1466949,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-06-28T20:06:40.000Z","date":"2024-06-26","kind":"sale","planned":true,"acquired":false,"shares":12326,"price":53.6774,"value":661627.6324,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023 and subsequently modified March 27, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the weighted average share price of an aggregate total of 12,326 shares sold in the price range of $53.18 to $54.17 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":7466,"source":{"system":"sec-edgar","filing":"0001415889-24-018407","document":"form4-06282024_080637.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924018407/form4-06282024_080637.xml","form_type":"4"}},{"id":1501438,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Restricted Stock 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2022."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, the RSUs shall vest annually over three (3) years with a cliff every twelve (12) months on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":22429,"derivative":{"underlying":"Common Stock","underlying_shares":22428},"source":{"system":"sec-edgar","filing":"0001415889-24-014599","document":"form4-05252024_120534.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924014599/form4-05252024_120534.xml","form_type":"4"}},{"id":1501437,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, 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The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":9485,"source":{"system":"sec-edgar","filing":"0001415889-24-008370","document":"form4-03192024_120347.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924008370/form4-03192024_120347.xml","form_type":"4"}},{"id":1571764,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2024-03-19T00:49:55.000Z","date":"2024-03-18","kind":"sale","planned":true,"acquired":false,"shares":3782,"price":69.0278,"value":261063.1396,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 18, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the weighted average share price of an aggregate total of 3,782 shares sold in the price range of $68.44 to $69.4399 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":12528,"source":{"system":"sec-edgar","filing":"0001415889-24-008370","document":"form4-03192024_120347.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000141588924008370/form4-03192024_120347.xml","form_type":"4"}},{"id":1683558,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2024-01-08T21:04:21.000Z","date":"2024-01-04","kind":"sale","planned":false,"acquired":false,"shares":8514,"price":55.2679,"value":470550.9006,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported reflects the weighted average sales price. These shares were sold in multiple transactions at prices that were not available from the broker at the time of filing. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":16310,"source":{"system":"sec-edgar","filing":"0001209191-24-001121","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000120919124001121/doc4.xml","form_type":"4"}},{"id":1686811,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock 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2023."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. \"RSU Grant Date\" shall mean January 3, 2023."}],"balance_after":30679,"derivative":{"underlying":"Common 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unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years.  \"RSU Grant Date\" shall mean January 2, 2024."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years.  \"RSU Grant Date\" shall mean January 2, 2024."}],"balance_after":61487,"derivative":{"underlying":"Common Stock","underlying_shares":61487},"source":{"system":"sec-edgar","filing":"0001209191-24-000918","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000120919124000918/doc4.xml","form_type":"4"}},{"id":1686809,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Stock Option (right to 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2022."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, the RSUs shall vest annually over three (3) years with a cliff every twelve (12) months on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":44857,"derivative":{"underlying":"Common Stock","underlying_shares":22428},"source":{"system":"sec-edgar","filing":"0001209191-23-032332","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000120919123032332/doc4.xml","form_type":"4"}},{"id":1877595,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, 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The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price."}],"balance_after":9485,"source":{"system":"sec-edgar","filing":"0001209191-23-032332","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000120919123032332/doc4.xml","form_type":"4"}},{"id":1877594,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common 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2023."}],"balance_after":24189,"source":{"system":"sec-edgar","filing":"0001209191-23-032332","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000120919123032332/doc4.xml","form_type":"4"}},{"id":2061562,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock Unit","published_at":"2023-01-05T21:45:08.000Z","date":"2023-01-03","kind":"grant","acquired":true,"shares":46018,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years.  \"RSU Grant Date\" shall mean January 3, 2023."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years.  \"RSU Grant Date\" shall mean January 3, 2023."}],"balance_after":46018,"derivative":{"underlying":"Common Stock","underlying_shares":46018},"source":{"system":"sec-edgar","filing":"0001209191-23-001899","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000120919123001899/doc4.xml","form_type":"4"}},{"id":2061561,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, Inc.","symbol":"ACLX"},"owners":[{"id":26521,"kind":"person","name":"Gilson Michelle","position":1,"cik":"0001930862","reported_name":"Gilson Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Stock Option (right to 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be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one forty-eighth (1/48th) of the shares subject to the option will vest each month following the Vesting Start Date on the same day of the month as the Vesting Start Date (or, if there is no corresponding day in a particular month, then the last day of the month) over four (4) years.  \"Vesting Start Date\" shall mean January 1, 2023."}],"balance_after":32500,"derivative":{"exercise_price":19.97,"expiration_date":"2032-09-28","underlying":"Common Stock","underlying_shares":32500},"source":{"system":"sec-edgar","filing":"0001209191-22-051631","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000120919122051631/doc4.xml","form_type":"4"}},{"id":2257689,"issuer":{"id":15294,"kind":"organization","name":"Arcellx, 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years with a cliff every twelve (12) months on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). \"Vesting Commencement Date\" shall mean May 23, 2022."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, the restricted stock units shall vest annually over three (3) years with a cliff every twelve (12) months on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":67285,"derivative":{"underlying":"Common 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to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, twenty-five percent (25%) of the shares subject to the Option shall vest on the one (1) year anniversary of the Vesting Commencement Date, and one forty-eighth (1/48th) of the shares subject to the Option shall vest each month thereafter on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month), \"Vesting Commencement Date\" shall mean May 23, 2022."}],"balance_after":103515,"derivative":{"exercise_price":8.66,"expiration_date":"2032-05-23","underlying":"Common Stock","underlying_shares":103515},"source":{"system":"sec-edgar","filing":"0001209191-22-031729","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1786205/000120919122031729/doc4.xml","form_type":"4"}}]}