{"transactions":[{"id":740352,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-12T12:54:16.000Z","date":"2026-06-10","kind":"grant","planned":false,"acquired":true,"shares":3017,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The Reporting Person was granted restricted stock units (RSUs), which represent a contingent right to receive one share of Class A common stock for each RSU. The RSUs are subject to a service-based vesting requirement, which shall be satisfied on the earlier of (A) the date of the next annual meeting of stockholders, or (B) the one-year anniversary of June 10, 2026."}],"balance_after":40331,"source":{"system":"sec-edgar","filing":"0002087908-26-000002","document":"wk-form4_1781283253.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000208790826000002/wk-form4_1781283253.xml","form_type":"4"}},{"id":1003996,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B-2 Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":320363,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The reported security is directly held by Hummingbird Ventures III CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":320363},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":30,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003995,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-6 Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":2260520,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The reported security is directly held by Hummingbird Ventures III CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2260520},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":29,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003994,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series C Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":137288,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"The reported security is directly held by Hummingbird Opportunity Fund II CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":137288},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":28,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003993,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B-1 Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":2261377,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"The reported security is directly held by Hummingbird Opportunity Fund II CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2261377},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":27,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003992,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-2 Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":33000,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"The reported security is directly held by Hummingbird Opportunity Fund II CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":33000},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":26,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003991,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-1 Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":20000,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"The reported security is directly held by Hummingbird Opportunity Fund II CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":20000},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":25,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003990,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series D Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":446103,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The reported security is directly held by Hummingbird Dragons CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":446103},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":24,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003989,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series C Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":1569015,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The reported security is directly held by Hummingbird Dragons CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1569015},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":23,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003988,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B-1 Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":18845,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"The reported security is directly held by Hummingbird Collective CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":18845},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":22,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003987,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B-2 Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":640727,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"The reported security is directly held by HB&Q NV (HB&Q COMPARTMENT III)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":640727},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":21,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003986,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-6 Convertible Preferred Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":false,"shares":28981,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":28981},"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":20,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003985,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":true,"shares":2580833,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The reported security is directly held by Hummingbird Ventures III CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":2580833,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":19,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003984,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":true,"shares":2631664,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"The reported security is directly held by Hummingbird Opportunity Fund II CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":2631664,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":18,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003983,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":true,"shares":2015118,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The reported security is directly held by Hummingbird Dragons CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":2015118,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003982,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":true,"shares":18845,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"The reported security is directly held by Hummingbird Collective CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":18845,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003981,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":true,"shares":640727,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"The reported security is directly held by HB&Q NV (HB&Q COMPARTMENT III)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":640727,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003980,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":true,"shares":37314,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."}],"balance_after":37314,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003979,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":false,"shares":2580833,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The reported security is directly held by Hummingbird Ventures III CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003978,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":false,"shares":2631664,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"The reported security is directly held by Hummingbird Opportunity Fund II CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003977,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":false,"shares":2015118,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The reported security is directly held by Hummingbird Dragons CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003976,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":false,"shares":18845,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"The reported security is directly held by Hummingbird Collective CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003975,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":false,"shares":640727,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"The reported security is directly held by HB&Q NV (HB&Q COMPARTMENT III)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003974,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"other","planned":false,"acquired":false,"shares":37314,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F10","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 Offering."},{"field":"price","element":"transactionPricePerShare","label":"F10","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 Offering."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003973,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":true,"shares":2580833,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series A-6 Convertible Preferred Stock, Series B-1 Convertible Preferred Stock, Series B-2 Convertible Preferred Stock, Series C Convertible Preferred Stock and/or Series D Convertible Preferred Stock."},{"field":"kind","element":"transactionCoding","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F8","text":"The reported security is directly held by Hummingbird Ventures III CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":2580833,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003972,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":true,"shares":2451665,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series A-6 Convertible Preferred Stock, Series B-1 Convertible Preferred Stock, Series B-2 Convertible Preferred Stock, Series C Convertible Preferred Stock and/or Series D Convertible Preferred Stock."},{"field":"kind","element":"transactionCoding","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F7","text":"The reported security is directly held by Hummingbird Opportunity Fund II CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":2631664,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003971,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":true,"shares":2015118,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series A-6 Convertible Preferred Stock, Series B-1 Convertible Preferred Stock, Series B-2 Convertible Preferred Stock, Series C Convertible Preferred Stock and/or Series D Convertible Preferred Stock."},{"field":"kind","element":"transactionCoding","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F6","text":"The reported security is directly held by Hummingbird Dragons CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":2015118,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003970,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":true,"shares":18845,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series A-6 Convertible Preferred Stock, Series B-1 Convertible Preferred Stock, Series B-2 Convertible Preferred Stock, Series C Convertible Preferred Stock and/or Series D Convertible Preferred Stock."},{"field":"kind","element":"transactionCoding","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F5","text":"The reported security is directly held by Hummingbird Collective CommV."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":18845,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003969,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":true,"shares":640727,"ownership":{"direct":false,"nature":"See Footnotes"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series A-6 Convertible Preferred Stock, Series B-1 Convertible Preferred Stock, Series B-2 Convertible Preferred Stock, Series C Convertible Preferred Stock and/or Series D Convertible Preferred Stock."},{"field":"kind","element":"transactionCoding","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F4","text":"The reported security is directly held by HB&Q NV (HB&Q COMPARTMENT III)."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F9","text":"Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."}],"balance_after":640727,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003968,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-07","kind":"exercise","planned":false,"acquired":true,"shares":28981,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series A-6 Convertible Preferred Stock, Series B-1 Convertible Preferred Stock, Series B-2 Convertible Preferred Stock, Series C Convertible Preferred Stock and/or Series D Convertible Preferred Stock."},{"field":"kind","element":"transactionCoding","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the \"Offering\") without payment of further consideration. The shares have no expiration date."}],"balance_after":37314,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}},{"id":1003967,"issuer":{"id":3992,"kind":"organization","name":"BillionToOne, Inc.","symbol":"BLLN"},"owners":[{"id":38914,"kind":"person","name":"Ileri Firat","position":1,"cik":"0002087908","reported_name":"Ileri Firat","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-11-10T21:38:58.000Z","date":"2025-11-06","kind":"grant","planned":false,"acquired":true,"shares":8333,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs shall vest over three years in equal annual installments on the anniversary of November 6, 2025, subject to the Reporting Person's continuous service to the Issuer through each such vesting date."}],"balance_after":8333,"source":{"system":"sec-edgar","filing":"0001193125-25-274946","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2087908/000119312525274946/ownership.xml","form_type":"4"}}]}