{"entity":{"type":"insider","cik":"0002087538","url":"/insider/0002087538","json_url":"/insider/0002087538.json","name":"Bremner Thomas S","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":6,"n_filings":1,"first":"2025-11-10","last":"2025-11-10","span_basis":"filed_date"},"name_variants":[{"name":"Bremner Thomas S","source":"filing","n_filings":1,"first_seen":"2025-11-10","last_seen":"2025-11-10"}],"transactions":[{"id":4044794,"accession":"0001193125-25-274945","txn_seq":15,"anchor":"line-15","filing_url":"/filing/0001193125-25-274945","line_url":"/filing/0001193125-25-274945#line-15","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002087538","owner_name":"Bremner Thomas S","owner_url":"/insider/0002087538","role":"Director","officer_title":null,"security_title":"Class A Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":17791.0,"shares_display":"17,791","price_per_share":60.0,"price_display":"60.00","price_state":"stated","total_value":1067460.0,"total_display":"1,067,460.00","shares_owned_after":693143.0,"shares_owned_after_display":"693,143","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-11-07","filed_date":"2025-11-10","scope":"insider"},{"id":4044792,"accession":"0001193125-25-274945","txn_seq":14,"anchor":"line-14","filing_url":"/filing/0001193125-25-274945","line_url":"/filing/0001193125-25-274945#line-14","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002087538","owner_name":"Bremner Thomas S","owner_url":"/insider/0002087538","role":"Director","officer_title":null,"security_title":"Class A Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":6867.0,"shares_display":"6,867","price_per_share":60.0,"price_display":"60.00","price_state":"stated","total_value":412020.0,"total_display":"412,020.00","shares_owned_after":246939.0,"shares_owned_after_display":"246,939","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-11-07","filed_date":"2025-11-10","scope":"insider"},{"id":4044790,"accession":"0001193125-25-274945","txn_seq":13,"anchor":"line-13","filing_url":"/filing/0001193125-25-274945","line_url":"/filing/0001193125-25-274945#line-13","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002087538","owner_name":"Bremner Thomas S","owner_url":"/insider/0002087538","role":"Director","officer_title":null,"security_title":"Class A Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":5446.0,"shares_display":"5,446","price_per_share":60.0,"price_display":"60.00","price_state":"stated","total_value":326760.0,"total_display":"326,760.00","shares_owned_after":275364.0,"shares_owned_after_display":"275,364","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-11-07","filed_date":"2025-11-10","scope":"insider"},{"id":4044788,"accession":"0001193125-25-274945","txn_seq":12,"anchor":"line-12","filing_url":"/filing/0001193125-25-274945","line_url":"/filing/0001193125-25-274945#line-12","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002087538","owner_name":"Bremner Thomas S","owner_url":"/insider/0002087538","role":"Director","officer_title":null,"security_title":"Class A Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":4084.0,"shares_display":"4,084","price_per_share":60.0,"price_display":"60.00","price_state":"stated","total_value":245040.0,"total_display":"245,040.00","shares_owned_after":159795.0,"shares_owned_after_display":"159,795","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-11-07","filed_date":"2025-11-10","scope":"insider"},{"id":4044786,"accession":"0001193125-25-274945","txn_seq":11,"anchor":"line-11","filing_url":"/filing/0001193125-25-274945","line_url":"/filing/0001193125-25-274945#line-11","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002087538","owner_name":"Bremner Thomas S","owner_url":"/insider/0002087538","role":"Director","officer_title":null,"security_title":"Class A Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":4016.0,"shares_display":"4,016","price_per_share":60.0,"price_display":"60.00","price_state":"stated","total_value":240960.0,"total_display":"240,960.00","shares_owned_after":156456.0,"shares_owned_after_display":"156,456","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-11-07","filed_date":"2025-11-10","scope":"insider"},{"id":4044784,"accession":"0001193125-25-274945","txn_seq":10,"anchor":"line-10","filing_url":"/filing/0001193125-25-274945","line_url":"/filing/0001193125-25-274945#line-10","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002087538","owner_name":"Bremner Thomas S","owner_url":"/insider/0002087538","role":"Director","officer_title":null,"security_title":"Class A Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":3462.0,"shares_display":"3,462","price_per_share":60.0,"price_display":"60.00","price_state":"stated","total_value":207720.0,"total_display":"207,720.00","shares_owned_after":179733.0,"shares_owned_after_display":"179,733","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-11-07","filed_date":"2025-11-10","scope":"insider"}],"next_cursor":null,"ledger_fault":false,"count":{"value":6,"kind":"exact"},"open_market_only":false,"composition":{"kind":"exact","rows":[{"code":"P","label":"Open-market purchase","n":6,"open_market":true},{"code":"S","label":"Open-market sale","n":0,"open_market":true},{"code":"M","label":"Option exercise","n":0,"open_market":false},{"code":"A","label":"Grant or award","n":0,"open_market":false},{"code":"F","label":"Tax withholding","n":0,"open_market":false},{"code":"D","label":"Disposition to the issuer","n":0,"open_market":false},{"code":"X","label":"In-the-money option exercise","n":0,"open_market":false}],"total":6},"affiliations":[{"type":"issuer","type_label":"ISSUER","cik":"0002070849","name":"BillionToOne, Inc.","url":"/issuer/0002070849","role":"Director","n_filings":1,"first_seen":"2025-11-10","last_seen":"2025-11-10"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0002087538","retrieved_at":"2026-08-21T09:19:01+00:00","coverage":{"filings":1505395,"transactions":4290787,"issuers":28597,"insiders":152303,"first_filed_date":"2003-06-30","last_filed_date":"2026-08-20","last_ingest":"2026-08-21T05:23:33.898496+00:00","counts_are":{"filings":"estimate","transactions":"estimate","issuers":"estimate","insiders":"estimate"},"source":"SEC EDGAR Form 4 filings, parsed by ebomi","fault":false},"license":{"underlying_records":"US SEC filings are public records of the United States government and are not subject to copyright. The transactional facts in them are not ours to license.","this_presentation":"The parsing, normalisation, curation, and presentation are ebomi's own work.","grant":"undecided","grant_note":"The open licence for ebomi's own layer is an open owner decision (SPEC-20260731T1159Z open question 3: CC BY 4.0 or CC0 with a citation request). Until it is taken, no grant is asserted here.","citation_request":"Balogh, A. Insider trading. Scientific Data 10, 237 (2023)","url":"https://ebomi.com/license"},"fair_use":{"policy":"These JSON endpoints are open and unauthenticated. Please read them at a human pace, identify your client in the User-Agent header, and use the published dataset for bulk work rather than crawling page by page.","bulk_alternative":"doi:10.1038/s41597-023-02147-6"}}