Company profile
BillionToOne, Inc. Insider Trading
BLLNEvery SEC Form 4 insider trading filing for BillionToOne, Inc. (BLLN) since April 2023 — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- Nasdaq
- Sector
- Services-Medical Laboratories
- CIK
- 0002070849
- Filings
- 55
- Insiders
- 28
- Last filing
- 2026-09-17
Activity summary
Recent insider activity is bullish. Over the last 30 days, 8 insiders purchased shares (net $604K). Buying was led by Thomas P. Lynch.
Quarterly balance
Buy and sell value by quarter, Q4 25 to Q3 26. BillionToOne, Inc. insiders are net sellers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $34.5M.
90 day insight
Over the last 90 days, BillionToOne, Inc. insiders bought $604K across 8 transactions with no open-market sales.
- Most active insider: Thomas P. Lynch with 26 transactions totaling $6.8M.
- Largest single sale: $2.1M by Thomas P. Lynch on Sep 17, 2026.
- 100% of recent sales were pre-scheduled 10b5-1 trades — typically less informative than open-market activity.
Activity skews bullish — buys outpace sales.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 17, 2026 | Thomas P. Lynch | BLLN | Option Exercise10b5 | 19,384 | $8.65 | $168K |
| Sep 17, 2026 | Thomas P. Lynch | BLLN | Option Exercise10b5 | 6,968 | $11.55 | $80K |
| Sep 17, 2026 | Thomas P. Lynch | BLLN | Option Exercise10b5 | 2,920 | $17.12 | $50K |
| Sep 17, 2026 | Thomas P. Lynch | BLLN | Option Exercise10b5 | 5,840 | $30.78 | $180K |
| Sep 17, 2026 | Thomas P. Lynch | BLLN | Sale10b5 | 19,384 | $110.36 | $2.14M |
45 more transactions hidden
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Query this yourself
The same rows, over the API.
curl "https://api.form4api.com/v1/transactions?ticker=BLLN" \
-H "X-Api-Key: $KEY"Top insiders
By total value filed.
Institutional Ownership
Top 13F-HR holders of BillionToOne, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →