Form 4 for BLLN BillionToOne, Inc.
Accepted 2026-06-17 17:47:10 ET · period of report 2026-06-15 · accession 0002087127-26-000002 · 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 | 2026-06-17 17:47 | 2026-06-15 | BLLN | Tsao David | CTO, Dir | M - OptEx | $2.80 | +20.0K | 21.0K | +2,000% | +$56.0K |
| DMT | 2026-06-17 17:47 | 2026-06-15 | BLLN | Tsao David | CTO, Dir | S - Sale+OE | $102.27 | -20.0K | 1,000 | -95% | -$2.05M |
| DMT | 2026-06-17 17:47 | 2026-06-15 | BLLN | Tsao David | CTO, Dir | M - OptEx | $2.80 | -20.0K | 620.0K | -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 | 2026-06-15 | 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 | 2026-06-15 | 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 | 2026-06-15 | S | D | 1,704 | $100.37 | 19,296 | 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 $100.000 to $100.9175 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 | 2026-06-15 | S | D | 2,361 | $101.55 | 16,935 | 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 $101.120 to $102.020 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 | 2026-06-15 | S | D | 2,816 | $102.77 | 14,119 | 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 $102.185 to $103.150 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 | 2026-06-15 | S | D | 2,889 | $103.68 | 11,230 | 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 $103.250 to $104.200 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 | 2026-06-15 | S | D | 230 | $104.47 | 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 $104.360 to $104.610 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 | 2026-06-15 | S | D | 600 | $98.74 | 10,400 | 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 $98.160 to $99.080 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 | 2026-06-15 | S | D | 1,000 | $100.05 | 9,400 | 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 $99.840 to $100.280 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 | 2026-06-15 | S | D | 2,461 | $101.37 | 6,939 | 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 $100.860 to $101.800 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 | 2026-06-15 | S | D | 2,978 | $102.60 | 3,961 | 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 $101.980 to $102.970 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 | 2026-06-15 | S | D | 2,398 | $103.63 | 1,563 | 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 $103.140 to $104.130 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 | Common | Class A Common Stock | 2026-06-15 | S | D | 563 | $104.32 | 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. (F12) The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $104.160 to $104.540 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. |
| 14 | Derivative | Stock Option (right to buy) | 2026-06-15 | M | D | 10,000 | $2.80 | 630,000 | D | $2.80 · — to 2031-06-07 | 10,000 Class A Common Stock | (F13) The options are fully vested and exercisable. |
| 15 | Derivative | Stock Option (right to buy) | 2026-06-15 | M | D | 10,000 | $2.80 | 620,000 | D | $2.80 · — to 2031-06-07 | 10,000 Class A Common Stock | (F13) The options are fully vested and exercisable. |