BillionToOne, Inc. (BLLN) IPO - S-1 Filing, Stock & Insider Activity
BillionToOne, Inc. IPO - Status & S-1 Filing
- Ticker: BLLN
- Status: Priced - IPO complete
- IPO / pricing date: 2025-11-06
- Exchange: NASDAQ
- Offering price: $60.00
- Shares offered: 29,084,235
- SEC CIK: 0002070849 · View the S-1 on SEC EDGAR →
Track every registration update on the InsiderAlpha IPO tracker.
Last SEC filing
BillionToOne, Inc. (BLLN) has filed 23 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-20. Insider sales over the same period: 90 transactions worth $21.62M. 3 Form 8-K material event filings were reported by BLLN in the last 90 days. 25 Form 144 notices of proposed sale were filed for BLLN stock. InsiderAlpha tracks every BLLN SEC filing - Form 4, Form 144, and 8-K - in real time, including Rule 10b5-1 plan detection.
About BillionToOne, Inc. (BLLN)
BillionToOne, Inc. trades under the ticker BLLN. InsiderAlpha tracks 38 primary SEC Form 4 filings from 15 reporting insiders for BLLN since 2025, sourced directly from SEC EDGAR.
| SEC CIK | 0002070849 |
|---|
90-Day SEC Filing Activity
| Insider sales (90d) | 90 ($21.62M) |
|---|---|
| Form 4 filings (90d) | 23 |
| Form 8-K filings (90d) | 3 |
| Form 144 notices (90d) | 25 |
| Latest Form 4 filing | 2026-07-20 |
Recent BLLN Insider Transactions (Form 4)
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Nancy Joann Johnson | Senior Vice President of Sales and Commercial Operations | S - Open-market sale [10b5-1] | 5.6K | $127.89 | $711K | SEC | |
| Nancy Joann Johnson | Senior Vice President of Sales and Commercial Operations | S - Open-market sale [10b5-1] | 2.1K | $126.98 | $271K | SEC | |
| Nancy Joann Johnson | Senior Vice President of Sales and Commercial Operations | S - Open-market sale [10b5-1] | 5.6K | $128.96 | $722K | SEC | |
| Nancy Joann Johnson | Senior Vice President of Sales and Commercial Operations | S - Open-market sale [10b5-1] | 906 | $129.78 | $118K | SEC | |
| David Tsao | Chief Technology Officer | S - Open-market sale [10b5-1] | 821 | $126.89 | $104K | SEC | |
| David Tsao | Chief Technology Officer | S - Open-market sale [10b5-1] | 1.7K | $124.65 | $215K | SEC | |
| David Tsao | Chief Technology Officer | S - Open-market sale [10b5-1] | 3.8K | $125.76 | $482K | SEC | |
| David Tsao | Chief Technology Officer | M - Option exercise [10b5-1] | 10.0K | $2.80 | $28K | SEC | |
| David Tsao | Chief Technology Officer | S - Open-market sale [10b5-1] | 1.1K | $122.90 | $135K | SEC | |
| David Tsao | Chief Technology Officer | M - Option exercise [10b5-1] | 10.0K | $2.80 | $28K | SEC | |
| David Tsao | Chief Technology Officer | S - Open-market sale [10b5-1] | 2.4K | $124.90 | $302K | SEC | |
| David Tsao | Chief Technology Officer | S - Open-market sale [10b5-1] | 3.2K | $125.85 | $401K | SEC | |
| David Tsao | Chief Technology Officer | S - Open-market sale [10b5-1] | 1.1K | $122.84 | $140K | SEC | |
| David Tsao | Chief Technology Officer | S - Open-market sale [10b5-1] | 2.3K | $123.71 | $281K | SEC | |
| Bosch John Roderick Ten | SVP of Laboratory Operations | S - Open-market sale [10b5-1] | 1.4K | $125.46 | $178K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for BillionToOne, Inc. (BLLN). Updated in real time as new filings are submitted to the SEC.
Most-Active BLLN Insiders - Last 90 Days
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Oguzhan Atay | 55 | $10.46M |
| Krishna Kittu Kolluri | 33 | - |
| David Tsao | 29 | $4.77M |
| NeoTribe Ventures I, L.P. | 20 | - |
| Shan Riku Sakakibara | 19 | $2.97M |
Recent BLLN Form 8-K Material Events
- - Item 1.01, 2.03, 9.01 [SEC]
- - Item 1.01, 2.03, 9.01 [SEC]
- - Item 2.02, 9.01 [SEC]
- - Item 2.02, 5.02, 9.01 · Earnings · neutral [SEC]
BillionToOne announced financial results for Q4 2025 and full year 2025 on March 4, 2026. The filing also reports Board approval of a new Annual Incentive Plan effective January 1, 2026 to attract and retain employees.
Recent BLLN Form 144 Notices of Proposed Sale
- - Atay Oguzhan (Officer · 2.5K shares · $343K) [SEC]
- - Atay Oguzhan (Member of immediate family of any of the foregoing · 12.5K shares · $1.72M) [SEC]
- - Atay Oguzhan (Officer · 32.5K shares · $4.49M) [SEC]
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
Recent Insider Filings
- - Nancy Joann Johnson (Senior Vice President of Sales and Commercial Operations)
- - Bosch John Roderick Ten (SVP of Laboratory Operations)
- - David Tsao (Chief Technology Officer)
- - Oguzhan Atay (Chairman and CEO)
- - Shan Riku Sakakibara (Chief Product Officer)
Form 4 Transaction Code Reference
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in BLLN insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
BLLN Insider Trading - FAQ
- What is the latest insider trade for BLLN?
- BillionToOne, Inc. (BLLN) had 23 insider filings in the last 90 days, with the most recent on 2026-07-20. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
- How many insiders are buying BLLN stock?
- 0 insider purchases of BLLN were filed in the last 90 days.
- How many insiders are selling BLLN stock?
- 90 insider sales of BLLN were filed in the last 90 days, totaling $21.62M.
- Where can I see BLLN SEC filings (Form 4, 10-K, 10-Q, 8-K)?
- This page tracks BLLN Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Learn More
- What is SEC Form 4?
- How to read insider buying signals
- Rule 10b5-1 trading plans explained
- The cluster buying signal
Open the live BLLN dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.