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These shares were sold in multiple transactions at prices ranging from $138.890 to $139.500 per share, inclusive. 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These shares were sold in multiple transactions at prices ranging from $137.750 to $138.740 per share, inclusive. 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These shares were sold in multiple transactions at prices ranging from $136.750 to $137.740 per share, inclusive. 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The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":12416,"source":{"system":"sec-edgar","filing":"0002070849-26-000052","document":"wk-form4_1785977563.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000207084926000052/wk-form4_1785977563.xml","form_type":"4"}},{"id":696058,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-08-06T00:52:51.000Z","date":"2026-08-03","kind":"sale","planned":true,"acquired":false,"shares":267,"price":139.2052,"value":37167.7884,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The reported price in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $123.740 to $124.735 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":175050,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":29,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712962,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":2324,"price":123.2472,"value":286426.4928,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F14","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.725 to $123.720 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":176271,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":28,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712961,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":586,"price":122.0845,"value":71541.517,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F13","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $121.555 to $122.490 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":178595,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":27,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712960,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":444,"price":120.688,"value":53585.472,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F12","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.380 to $121.020 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":179181,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":26,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712959,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":591,"price":119.6744,"value":70727.5704,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $119.305 to $120.2725 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":179625,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":25,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712958,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1034,"price":118.8071,"value":122846.5414,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.250 to $119.240 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":180216,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":24,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712957,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":50,"price":124.74,"value":6237.0,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":181250,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":23,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712956,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1221,"price":124.0448,"value":151458.7008,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F15","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.740 to $124.735 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":181300,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":22,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712955,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":2323,"price":123.2473,"value":286303.4779,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F14","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.725 to $123.720 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":182521,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":21,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712954,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":587,"price":122.0839,"value":71663.2493,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F13","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $121.555 to $122.490 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":184844,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":20,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712953,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":444,"price":120.688,"value":53585.472,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F12","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.380 to $121.020 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":185431,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":19,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712952,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":591,"price":119.6744,"value":70727.5704,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $119.305 to $120.2725 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":185875,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":18,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712951,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1034,"price":118.8074,"value":122846.8516,"ownership":{"direct":false,"nature":"By spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.250 to $119.240 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F10","text":"Represents shares held by the Reporting Person's spouse."}],"balance_after":186466,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712950,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":194,"price":124.6147,"value":24175.2518,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.535 to $124.735 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712949,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1642,"price":123.8093,"value":203294.8706,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.475 to $124.455 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":194,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712948,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1945,"price":123.0709,"value":239372.9005,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.465 to $123.450 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":1836,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712947,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":349,"price":121.8357,"value":42520.6593,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $121.390 to $122.230 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":3781,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712946,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":570,"price":120.6596,"value":68775.972,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.225 to $121.160 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":4130,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712945,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1138,"price":119.3648,"value":135837.1424,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $119.055 to $119.970 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":4700,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712944,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":412,"price":118.487,"value":48816.644,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.050 to $119.020 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":5838,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712943,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":622,"price":124.6144,"value":77510.1568,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.535 to $124.735 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":6250,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712942,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":5253,"price":123.8094,"value":650370.7782,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.475 to $124.455 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":6872,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712941,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":6223,"price":123.0714,"value":765873.3222,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.465 to $123.450 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":12125,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712940,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1115,"price":121.8364,"value":135847.586,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $121.390 to $122.230 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":18348,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712939,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1828,"price":120.6601,"value":220566.6628,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.225 to $121.160 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":19463,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712938,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":3639,"price":119.365,"value":434369.235,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $119.055 to $119.970 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":21291,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712937,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"sale","planned":true,"acquired":false,"shares":1320,"price":118.4866,"value":156402.312,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.050 to $119.020 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":24930,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712936,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"exercise","planned":true,"acquired":true,"shares":6250,"price":2.8,"value":17500.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."}],"balance_after":26250,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":712935,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Class A Common Stock","published_at":"2026-07-08T23:06:42.000Z","date":"2026-07-06","kind":"exercise","planned":true,"acquired":true,"shares":20000,"price":2.8,"value":56000.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026."}],"balance_after":20000,"source":{"system":"sec-edgar","filing":"0002088549-26-000004","document":"wk-form4_1783552000.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000004/wk-form4_1783552000.xml","form_type":"4"}},{"id":743476,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":25525,"kind":"person","name":"Atay Oguzhan","position":1,"cik":"0002088549","reported_name":"Atay Oguzhan","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class B Common Stock","published_at":"2026-06-11T00:35:55.000Z","date":"2026-06-08","kind":"exercise","planned":true,"acquired":false,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F8","text":"These shares of Class B common stock were converted at a 1:1 ratio for shares of Class A common stock at the option of the holder."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F11","text":"Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"These shares of Class B common stock were converted at a 1:1 ratio for shares of Class A common stock at the option of the holder."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F11","text":"Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F11","text":"Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock."}],"balance_after":2217542,"derivative":{"underlying":"Class A Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0002088549-26-000002","document":"wk-form4_1781138152.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/2088549/000208854926000002/wk-form4_1781138152.xml","form_type":"4"}}],"next_cursor":"2026-06-11T00:35:55.000000Z,743476"}