Form 4 for BLLN BillionToOne, Inc.
Accepted 2026-08-27 20:19:51 ET · period of report 2026-08-25 · accession 0002087127-26-000006 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DT | 2026-08-27 20:19 | 2026-08-25 | BLLN | Tsao David | CTO, Dir | M - OptEx | $2.80 | +10.0K | 11.0K | +1,000% | +$28.0K |
| DT | 2026-08-27 20:19 | 2026-08-25 | BLLN | Tsao David | CTO, Dir | S - Sale+OE | $100.00 | -10.0K | 1,000 | -91% | -$1.00M |
| DT | 2026-08-27 20:19 | 2026-08-25 | BLLN | Tsao David | CTO, Dir | M - OptEx | $2.80 | -10.0K | 580.0K | -2% | -$28.0K |
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 | 2026-08-25 | 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 | 2026-08-25 | S | D | 10,000 | $100.00 | 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. |
| 3 | Derivative | Stock Option (right to buy) | 2026-08-25 | M | D | 10,000 | $2.80 | 580,000 | D | $2.80 · — to 2031-06-07 | 10,000 Class A Common Stock | (F2) The options are fully vested and exercisable. |