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These shares were sold in multiple transactions at prices ranging from $129.580 to $130.010 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":6900,"source":{"system":"sec-edgar","filing":"0002070849-26-000044","document":"wk-form4_1784590690.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000044/wk-form4_1784590690.xml","form_type":"4"}},{"id":705914,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-07-20T23:38:12.000Z","date":"2026-07-16","kind":"sale","planned":true,"acquired":false,"shares":5601,"price":128.9551,"value":722277.5151,"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 $128.475 to $129.340 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":7806,"source":{"system":"sec-edgar","filing":"0002070849-26-000044","document":"wk-form4_1784590690.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000044/wk-form4_1784590690.xml","form_type":"4"}},{"id":705913,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-07-20T23:38:12.000Z","date":"2026-07-16","kind":"sale","planned":true,"acquired":false,"shares":5559,"price":127.886,"value":710918.274,"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 $127.445 to $128.430 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":13407,"source":{"system":"sec-edgar","filing":"0002070849-26-000044","document":"wk-form4_1784590690.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000044/wk-form4_1784590690.xml","form_type":"4"}},{"id":705912,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-07-20T23:38:12.000Z","date":"2026-07-16","kind":"sale","planned":true,"acquired":false,"shares":2133,"price":126.9821,"value":270852.8193,"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 $126.330 to $127.300 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":18966,"source":{"system":"sec-edgar","filing":"0002070849-26-000044","document":"wk-form4_1784590690.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000044/wk-form4_1784590690.xml","form_type":"4"}},{"id":715942,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-07-07T00:38:08.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":801,"price":124.9137,"value":100055.8737,"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 $124.900 to $124.940 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":21099,"source":{"system":"sec-edgar","filing":"0002087387-26-000002","document":"wk-form4_1783384686.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000208738726000002/wk-form4_1783384686.xml","form_type":"4"}},{"id":743485,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-06-11T00:36:25.000Z","date":"2026-06-09","kind":"sale","planned":true,"acquired":false,"shares":1400,"price":100.3079,"value":140431.06,"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 $99.990 to $100.720 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."}],"balance_after":21900,"source":{"system":"sec-edgar","filing":"0002070849-26-000036","document":"wk-form4_1781138180.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000036/wk-form4_1781138180.xml","form_type":"4"}},{"id":743484,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-06-11T00:36:25.000Z","date":"2026-06-09","kind":"sale","planned":true,"acquired":false,"shares":1816,"price":102.3367,"value":185843.4472,"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 $101.990 to $102.570 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":23300,"source":{"system":"sec-edgar","filing":"0002070849-26-000036","document":"wk-form4_1781138180.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000036/wk-form4_1781138180.xml","form_type":"4"}},{"id":743483,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-06-11T00:36:25.000Z","date":"2026-06-09","kind":"sale","planned":true,"acquired":false,"shares":2700,"price":101.3757,"value":273714.39,"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 $100.990 to $101.710 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":25116,"source":{"system":"sec-edgar","filing":"0002070849-26-000036","document":"wk-form4_1781138180.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000036/wk-form4_1781138180.xml","form_type":"4"}},{"id":743482,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-06-11T00:36:25.000Z","date":"2026-06-09","kind":"sale","planned":true,"acquired":false,"shares":4666,"price":99.2721,"value":463203.6186,"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 $98.900 to $99.870 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":27816,"source":{"system":"sec-edgar","filing":"0002070849-26-000036","document":"wk-form4_1781138180.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000036/wk-form4_1781138180.xml","form_type":"4"}},{"id":743481,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-06-11T00:36:25.000Z","date":"2026-06-08","kind":"sale","planned":true,"acquired":false,"shares":200,"price":100.985,"value":20197.0,"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."},{"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 $100.980 to $100.990 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":32482,"source":{"system":"sec-edgar","filing":"0002070849-26-000036","document":"wk-form4_1781138180.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000036/wk-form4_1781138180.xml","form_type":"4"}},{"id":743480,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-06-11T00:36:25.000Z","date":"2026-06-08","kind":"sale","planned":true,"acquired":false,"shares":300,"price":100.05,"value":30015.0,"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."},{"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 $99.960 to $100.220 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":32682,"source":{"system":"sec-edgar","filing":"0002070849-26-000036","document":"wk-form4_1781138180.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000036/wk-form4_1781138180.xml","form_type":"4"}},{"id":743479,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Class A Common Stock","published_at":"2026-06-11T00:36:25.000Z","date":"2026-06-08","kind":"sale","planned":true,"acquired":false,"shares":2918,"price":99.0868,"value":289135.2824,"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 $98.900 to $99.690 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":32982,"source":{"system":"sec-edgar","filing":"0002070849-26-000036","document":"wk-form4_1781138180.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000207084926000036/wk-form4_1781138180.xml","form_type":"4"}},{"id":1002403,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Stock Option (right to buy)","published_at":"2025-11-12T23:07:34.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":true,"shares":40000,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the \"Offering\")."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the \"Offering\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on September 15, 2025, subject to the Reporting Person's continuous service with the Issuer through each such vesting date."}],"balance_after":40000,"derivative":{"exercise_price":30.78,"expiration_date":"2035-09-30","underlying":"Class A Common Stock","underlying_shares":40000},"source":{"system":"sec-edgar","filing":"0001193125-25-278118","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000119312525278118/ownership.xml","form_type":"4"}},{"id":1002402,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Stock Option (right to buy)","published_at":"2025-11-12T23:07:34.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":false,"shares":40000,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the \"Offering\")."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the \"Offering\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on September 15, 2025, subject to the Reporting Person's continuous service with the Issuer through each such vesting date."}],"balance_after":0,"derivative":{"exercise_price":30.78,"expiration_date":"2035-09-30","underlying":"Common Stock","underlying_shares":40000},"source":{"system":"sec-edgar","filing":"0001193125-25-278118","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/2087387/000119312525278118/ownership.xml","form_type":"4"}},{"id":1002401,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":29576,"kind":"person","name":"Johnson Nancy JoAnn","position":1,"cik":"0002087387","reported_name":"Johnson Nancy JoAnn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Stock Option (right to buy)","published_at":"2025-11-12T23:07:34.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":true,"shares":20000,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the \"Offering\")."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the \"Offering\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. 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