{"entity":{"type":"insider","cik":"0002088547","url":"/insider/0002088547","json_url":"/insider/0002088547.json","name":"Sakakibara Shan Riku","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":10,"n_filings":4,"first":"2026-06-10","last":"2026-08-04","span_basis":"filed_date"},"name_variants":[{"name":"Sakakibara Shan Riku","source":"filing","n_filings":4,"first_seen":"2026-06-10","last_seen":"2026-08-04"}],"transactions":[{"id":5953231,"accession":"0002088547-26-000008","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0002088547-26-000008","line_url":"/filing/0002088547-26-000008#line-1","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002088547","owner_name":"Sakakibara Shan Riku","owner_display_name":"Sakakibara Shan Riku","owner_url":"/insider/0002088547","role":"Officer (Chief Product Officer)","role_mark":"O","role_mark_label":"Officer (Chief Product Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Product Officer","security_title":"Class A Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":4000.0,"shares_display":"4,000","price_per_share":140.21,"price_display":"140.21","price_state":"stated","total_value":560840.0,"total_display":"560,840.00","total_whole":"560,840","shares_owned_after":200000.0,"shares_owned_after_display":"200,000","ownership_form":"D","is_10b5_1":null,"transaction_date":"2026-07-31","filed_date":"2026-08-04","scope":"insider"},{"id":6162372,"accession":"0002088547-26-000006","txn_seq":9,"anchor":"line-9","filing_url":"/filing/0002088547-26-000006","line_url":"/filing/0002088547-26-000006","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002088547","owner_name":"Sakakibara Shan Riku","owner_display_name":"Sakakibara Shan Riku","owner_url":"/insider/0002088547","role":"Officer (Chief Product Officer)","role_mark":"O","role_mark_label":"Officer (Chief Product Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Product Officer","security_title":"Class A Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":8000.0,"shares_display":"8,000","price_per_share":125.0,"price_display":"125.00","price_state":"stated","total_value":1000000.0,"total_display":"1,000,000.00","total_whole":"1,000,000","shares_owned_after":208000.0,"shares_owned_after_display":"208,000","ownership_form":"D","is_10b5_1":null,"transaction_date":"2026-07-09","filed_date":"2026-07-13","scope":"insider","n_lines":5},{"id":6162348,"accession":"0002088547-26-000004","txn_seq":3,"anchor":"line-3","filing_url":"/filing/0002088547-26-000004","line_url":"/filing/0002088547-26-000004","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002088547","owner_name":"Sakakibara Shan Riku","owner_display_name":"Sakakibara Shan Riku","owner_url":"/insider/0002088547","role":"Officer (Chief Product Officer)","role_mark":"O","role_mark_label":"Officer (Chief Product Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Product Officer","security_title":"Class A Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":8000.0,"shares_display":"8,000","price_per_share":110.0,"price_display":"110.00","price_state":"stated","total_value":880000.0,"total_display":"880,000.00","total_whole":"880,000","shares_owned_after":212000.0,"shares_owned_after_display":"212,000","ownership_form":"D","is_10b5_1":null,"transaction_date":"2026-06-24","filed_date":"2026-06-26","scope":"insider","n_lines":2},{"id":5831259,"accession":"0002088547-26-000002","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0002088547-26-000002","line_url":"/filing/0002088547-26-000002","is_derivative":false,"issuer_cik":"0002070849","issuer_name":"BillionToOne, Inc.","issuer_ticker":"BLLN","issuer_name_source":null,"issuer_url":"/issuer/0002070849","owner_cik":"0002088547","owner_name":"Sakakibara Shan Riku","owner_display_name":"Sakakibara Shan Riku","owner_url":"/insider/0002088547","role":"Officer (Chief Product Officer)","role_mark":"O","role_mark_label":"Officer (Chief Product Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Product Officer","security_title":"Class A Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":8000.0,"shares_display":"8,000","price_per_share":98.225,"price_display":"98.22","price_state":"stated","total_value":785800.0,"total_display":"785,800.00","total_whole":"785,800","shares_owned_after":212000.0,"shares_owned_after_display":"212,000","ownership_form":"D","is_10b5_1":null,"transaction_date":"2026-06-08","filed_date":"2026-06-10","scope":"insider","n_lines":2}],"collapsed":true,"next_cursor":null,"ledger_fault":false,"count":{"value":10,"kind":"exact"},"open_market_only":false,"composition":{"kind":"exact","rows":[{"code":"P","label":"Open-market purchase","n":0,"open_market":true},{"code":"S","label":"Open-market sale","n":10,"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":10},"affiliations":[{"type":"issuer","type_label":"ISSUER","cik":"0002070849","name":"BillionToOne, Inc.","url":"/issuer/0002070849","role":"Officer (Chief Product Officer)","n_filings":4,"first_seen":"2026-06-10","last_seen":"2026-08-04"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0002088547","retrieved_at":"2026-08-24T02:10:01+00:00","coverage":{"filings":1506293,"transactions":4290787,"issuers":28597,"insiders":152303,"first_filed_date":"2003-06-30","last_filed_date":"2026-08-21","last_ingest":"2026-08-22T05:23:40.159918+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"}}