David Tsao is CTO at BillionToOne, Inc. (BLLN). They have made 1 open-market trade across 1 company since 2025, most recently 2026-10-05.
CIK 0002087127
1 open-market purchase totalling $60K since 2025, never a sale. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| BLLN | 1,000 | $98K |
Shares reported on the most recent Form 4, priced at the 2026-10-07 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| BLLN | SELL · 10b5-1 | 2026-10-05 | 2026-10-07 | $108.15 | $2.2M | — | — | — |
| BLLN | SELL · 10b5-1 | 2026-09-24 | 2026-09-28 | $125.00 | $417K | -21.1% | — | — |
| BLLN | SELL · 10b5-1 | 2026-09-09 | 2026-09-11 | $98.77 | $2.0M | +16.5% | -5.1% | — |
| BLLN | SELL · 10b5-1 | 2026-08-25 | 2026-08-27 | $100.00 | $1.0M | +3.5% | +27.4% | — |
| BLLN | SELL · 10b5-1 | 2026-08-10 | 2026-08-12 | $92.86 | $929K | -1.2% | +0.5% | — |
| BLLN | SELL · 10b5-1 | 2026-07-13 | 2026-07-15 | $124.88 | $2.5M | -0.5% | -27.3% | -26.5% |
| BLLN | SELL · 10b5-1 | 2026-06-15 | 2026-06-17 | $102.27 | $2.0M | +19.2% | +29.5% | +3.0% |
| BLLN | BUY | 2025-11-07 | 2025-11-12 | $60.00 | $60K | +19.3% | +1.4% | -8.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.