David Tsao
Chief Technology Officer at BillionToOne Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 1 year
- Director since
- 2025
1 year of board service in total across 1 board, counting each seat separately. Longest: BillionToOne Inc., 1 year.
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Nov 2, 2026 | BillionToOne Inc. | Option exercise | +10,000 | $2.80 | $28,000 |
| Nov 2, 2026 | BillionToOne Inc. | Option exercise | +10,000 | $2.80 | $28,000 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −917 | $107.31 | $98,406 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −2,320 | $108.24 | $251,106 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −3,241 | $109.04 | $353,412 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −1,992 | $110.13 | $219,377 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −1,130 | $110.77 | $125,171 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −300 | $112.19 | $33,657 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −100 | $113.17 | $11,317 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −1,063 | $107.33 | $114,094 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −2,450 | $108.39 | $265,544 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −3,234 | $109.15 | $353,000 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −2,389 | $110.31 | $263,520 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −633 | $111.14 | $70,350 |
| Nov 2, 2026 | BillionToOne Inc. | Open-market sale | −208 | $112.01 | $23,299 |
Questions about David Tsao
What boards is David Tsao on?
David Tsao sits on the board of BillionToOne Inc.
How long has David Tsao served on boards?
Our records show at least 1 year of board service across 1 board, the earliest from 2025.
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