BillionToOne, Inc.
BLLN- Exchange
- Nasdaq
- Industry
- Services-Medical Laboratories
- SEC CIK
- 0002070849
In the last 90 days, BillionToOne, Inc. insiders filed 0 open-market purchases and 19 sales; 155 institutions reported holding it in 13F filings for Q2 2026, worth $1.82B in total; no superinvestor holds it.
Holders of 5% or more of BLLN
Holders whose latest Schedule 13D or 13G filing reports 5% or more of BillionToOne, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Hummingbird Ventures Management NV | 13D/A | 18.57%8.03M shares | −1.03 ppfrom 19.60% | Jan 20, 20262 filings | Nov 9, 2026 | SEC |
| NeoTribe Ventures I, L.P. | 13G | 10.60%4.36M shares | New | Feb 13, 20261 filing | Feb 13, 2026 | SEC |
| Atay Oguzhan | 13G | 7.30%3.21M shares | New | Feb 17, 20261 filing | Feb 17, 2026 | SEC |
| Tsao David | 13G | 6.90%3.04M shares | New | Feb 17, 20261 filing | Feb 17, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
5 Schedule 13D and 13G filings on BillionToOne, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Nov 9, 20266:03 AM ET | Hummingbird Ventures Management NVand 9 others | 13D/A | 18.57%8.03M shares | −1.03 ppfrom 19.60% | Sep 30, 2026 | SEC |
| Feb 17, 20265:00 PM ET | Tsao David | 13G | 6.90%3.04M shares | New | Dec 31, 2025 | SEC |
| Feb 17, 20265:00 PM ET | Atay Oguzhan | 13G | 7.30%3.21M shares | New | Dec 31, 2025 | SEC |
| Feb 13, 20262:45 PM ET | NeoTribe Ventures I, L.P.and 7 others | 13G | 10.60%4.36M shares | New | Nov 7, 2025 | SEC |
| Jan 20, 20267:46 PM ET | Humming Bird Ventures Management NVand 8 others | 13D | 19.60%7.89M shares | New | Nov 6, 2025 | SEC |
Form 144: proposed insider sales
58 notices from officers, directors and other affiliates planning to sell BillionToOne, Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Nov 2, 20262:25 PM ET | ten Bosch John RoderickOfficer | 2.83K | $320.7K | Nov 2, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Nov 2, 20261:08 PM ET | Atay OguzhanFamily member of an insider | 5.33K | $603.6K | Nov 2, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Nov 2, 202612:53 PM ET | Atay OguzhanOfficer · Director | 25.0K | $2.83M | Nov 2, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Nov 2, 202610:10 AM ET | Tsao DavidOfficer · Director | 1.75K | $198.3K | Nov 2, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Nov 2, 20269:59 AM ET | Tsao DavidOfficer · Director | 20.0K | $2.27M | Nov 2, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 28, 202612:02 PM ET | Atay OguzhanFamily member of an insider | 2.67K | $314.7K | Oct 28, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 28, 202611:33 AM ET | Atay OguzhanOfficer · Director | 8.33K | $983.3K | Oct 28, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 15, 20264:33 PM ET | Atay OguzhanOfficer · Director | 5.15K | $516.2K | Oct 15, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 14, 20264:19 PM ET | Atay OguzhanOfficer · Director | 3.18K | $313.0K | Oct 14, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 14, 202612:32 PM ET | Atay OguzhanFamily member of an insider | 2.67K | $261.4K | Oct 14, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 13, 20269:00 AM ET | Atay OguzhanFamily member of an insider | 2.67K | $260.3K | Oct 12, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 13, 20268:51 AM ET | Atay OguzhanOfficer · Director | 16.7K | $1.56M | Oct 12, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 5, 20264:10 PM ET | Tsao DavidOfficer · Director | 20.0K | $2.16M | Oct 5, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 5, 20261:46 PM ET | ten Bosch John RoderickOfficer | 2.83K | $298.0K | Oct 5, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Oct 5, 202610:50 AM ET | Tsao DavidOfficer · Director | 1.75K | $184.0K | Oct 5, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 28, 202611:37 AM ET | Atay OguzhanFamily member of an insider | 2.67K | $321.6K | Sep 28, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 28, 202611:30 AM ET | Atay OguzhanOfficer · Director | 8.33K | $1.01M | Sep 28, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 24, 20265:02 PM ET | Tsao DavidOfficer · Director | 3.33K | $416.6K | Sep 24, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 24, 20262:17 PM ET | ten Bosch John RoderickOfficer | 1.42K | $169.9K | Sep 24, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 21, 20263:00 PM ET | ten Bosch John RoderickOfficer | 1.42K | $151.0K | Sep 21, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 17, 20264:20 PM ET | Lynch Thomas P.Officer | 35.1K | $3.87M | Sep 17, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 14, 20264:35 PM ET | Atay OguzhanOfficer · Director | 25.0K | $2.51M | Sep 14, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 14, 202611:56 AM ET | Atay OguzhanFamily member of an insider | 5.33K | $522.5K | Sep 14, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 9, 202612:20 PM ET | Tsao DavidOfficer · Director | 1.75K | $170.7K | Sep 9, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
| Sep 9, 202611:57 AM ET | Tsao DavidOfficer · Director | 20.0K | $2.05M | Sep 9, 202610b5-1 | Fidelity Brokerage Services LLC | SEC |
Showing the latest 25. See the BLLN notices from the last 12 months