Form 4 for BLLN BillionToOne, Inc.
Accepted 2026-07-15 16:38:10 ET · period of report 2026-07-13 · accession 0002087127-26-000004 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DMT | 2026-07-15 16:38 | 2026-07-13 | BLLN | Tsao David | CTO, Dir | M - OptEx | $2.80 | +20.0K | 21.0K | +2,000% | +$56.0K |
| DMT | 2026-07-15 16:38 | 2026-07-13 | BLLN | Tsao David | CTO, Dir | S - Sale+OE | $124.88 | -20.0K | 1,000 | -95% | -$2.50M |
| DMT | 2026-07-15 16:38 | 2026-07-13 | BLLN | Tsao David | CTO, Dir | M - OptEx | $2.80 | -20.0K | 600.0K | -3% | -$56.0K |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Class A Common Stock | 2026-07-13 | M | A | 10,000 | $2.80 | 11,000 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. |
| 2 | Common | Class A Common Stock | 2026-07-13 | M | A | 10,000 | $2.80 | 21,000 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. |
| 3 | Common | Class A Common Stock | 2026-07-13 | S | D | 1,102 | $122.90 | 19,898 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F2) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.420 to $123.3775 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 4 | Common | Class A Common Stock | 2026-07-13 | S | D | 2,477 | $123.84 | 17,421 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F3) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.440 to $124.435 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 5 | Common | Class A Common Stock | 2026-07-13 | S | D | 2,415 | $124.90 | 15,006 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F4) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.450 to $125.4325 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 6 | Common | Class A Common Stock | 2026-07-13 | S | D | 3,185 | $125.85 | 11,821 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F5) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $125.4525 to $126.450 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 7 | Common | Class A Common Stock | 2026-07-13 | S | D | 821 | $126.89 | 11,000 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F6) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $126.490 to $127.2981 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 8 | Common | Class A Common Stock | 2026-07-13 | S | D | 1,138 | $122.84 | 9,862 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F7) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.185 to $123.105 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 9 | Common | Class A Common Stock | 2026-07-13 | S | D | 2,274 | $123.71 | 7,588 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F8) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.2852 to $124.258 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 10 | Common | Class A Common Stock | 2026-07-13 | S | D | 1,725 | $124.65 | 5,863 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F9) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.290 to $125.240 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 11 | Common | Class A Common Stock | 2026-07-13 | S | D | 3,835 | $125.76 | 2,028 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F10) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $125.295 to $126.2805 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 12 | Common | Class A Common Stock | 2026-07-13 | S | D | 1,028 | $126.90 | 1,000 | D | — | — | (F1) The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026. (F11) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $126.360 to $127.220 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| 13 | Derivative | Stock Option (right to buy) | 2026-07-13 | M | D | 10,000 | $2.80 | 610,000 | D | $2.80 · — to 2031-06-07 | 10,000 Class A Common Stock | (F12) The options are fully vested and exercisable. |
| 14 | Derivative | Stock Option (right to buy) | 2026-07-13 | M | D | 10,000 | $2.80 | 600,000 | D | $2.80 · — to 2031-06-07 | 10,000 Class A Common Stock | (F12) The options are fully vested and exercisable. |