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BillionToOne, Inc. (NASDAQ:BLLN)
US · Delayed Price · Currency is USD
Healthcare · Medical - Diagnostics & Research
110.16+2.39 (+2.22%)
Market cap
$5.20B
Health Score
Analyst consensus
Listed since
Nov 6, 2025
Website
Insider Score
––Not scored
BLLN Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
BLLN Stock Insider Trading Activity
BLLN stock’s insider trading shows 21 sales on the open market for an estimated $4.10M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Atay Oguzhan CEO | Option exercise | 5,150 | $2.80 | $14.42K | New | 5,150 | Oct 15, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 900 | $98.43 | $88.59K | 17.5% | 4,250 | Oct 15, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 1,861 | $99.84 | $185.81K | 43.8% | 2,389 | Oct 15, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 1,276 | $100.60 | $128.37K | 53.4% | 1,113 | Oct 15, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 980 | $101.79 | $99.75K | 88.1% | 133 | Oct 15, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 133 | $102.78 | $13.67K | 100% | 0 | Oct 15, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Option exercise | 3,183 | $2.80 | $8.91K | New | 3,183 | Oct 14, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 3,083 | $98.32 | $303.12K | 96.9% | 100 | Oct 14, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 100 | $99.00 | $9.90K | 100% | 0 | Oct 14, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 2,667 | $98.00 | $261.37K | 1.8% | 149,168 | Oct 14, 2026 | — | Form 4 |
| Lynch Thomas P. Other | Option exercise | 2,000 | $8.65 | $17.30K | 23.0% | 10,700 | Oct 13, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Option exercise | 16,667 | $2.80 | $46.67K | New | 16,667 | Oct 12, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 1,961 | $91.57 | $179.57K | 11.8% | 14,706 | Oct 12, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 2,553 | $93.05 | $237.55K | 17.4% | 12,153 | Oct 12, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 6,763 | $93.65 | $633.33K | 55.6% | 5,390 | Oct 12, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 3,869 | $94.61 | $366.06K | 71.8% | 1,521 | Oct 12, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 1,521 | $96.39 | $146.61K | 100% | 0 | Oct 12, 2026 | — | Form 4 |
| Atay Oguzhan CEO | Sell | 2,667 | $97.61 | $260.33K | 1.7% | 151,835 | Oct 12, 2026 | — | Form 4 |
| Lynch Thomas P. Other | Option exercise | 8,000 | $8.65 | $69.20K | 1143% | 8,700 | Oct 8, 2026 | — | Form 4 |
| Tsao David Director | Option exercise | 10,000 | $2.80 | $28.00K | 1000% | 11,000 | Oct 5, 2026 | — | Form 4 |
| Tsao David Director | Option exercise | 10,000 | $2.80 | $28.00K | 90.9% | 21,000 | Oct 5, 2026 | — | Form 4 |
| Tsao David Director | Sell | 866 | $105.90 | $91.71K | 4.1% | 20,134 | Oct 5, 2026 | — | Form 4 |
| Tsao David Director | Sell | 1,909 | $107.19 | $204.64K | 9.5% | 18,225 | Oct 5, 2026 | — | Form 4 |
| Tsao David Director | Sell | 4,284 | $108.39 | $464.36K | 23.5% | 13,941 | Oct 5, 2026 | — | Form 4 |
| Tsao David Director | Sell | 2,921 | $109.00 | $318.40K | 21.0% | 11,020 | Oct 5, 2026 | — | Form 4 |
| Tsao David Director | Sell | 20 | $110.08 | $2.20K | 0.2% | 11,000 | Oct 5, 2026 | — | Form 4 |
| Tsao David Director | Sell | 555 | $105.56 | $58.59K | 5.0% | 10,445 | Oct 5, 2026 | — | Form 4 |
| Tsao David Director | Sell | 400 | $106.10 | $42.44K | 3.8% | 10,045 | Oct 5, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Option exercise (M) — Exercise or conversion of an exempt derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.