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Tsao David
Chief Technology OfficerDirectorCIK 0002087127
Total Volume
$33.1M
9 filings
Purchases
$60.0K
1 buy txns
Sales
$8.9M
26 sell txns
Net Activity
-$8.8M
net sold
Profile
- Filings
- 9
- Buy transactions
- 1
- Sell transactions
- 26
- Companies
- 1
- Active
- 2025–2026
Tsao David, Chief Technology Officer, Director, accounts for 9 disclosed filings worth $33.1M, all concentrated in BillionToOne, Inc. (BLLN), active 2025–2026. The record is heavily weighted toward selling, with $60.0K in purchases against $8.9M in sales. The largest single open-market purchase on record is $60.0K in BillionToOne, Inc.. Data is sourced from official SEC Form 3, 4, and 5 filings.
Associated Companies
Trading History
9 loaded
| Sep 28 | BLLN BillionToOne, Inc. | Tsao David | Chief Technology Officer, Director | Sell | $416.6K |
| Sep 11 | BLLN BillionToOne, Inc. | Tsao David | Chief Technology Officer, Director | Sell | $2.0M |
| Sep 8 | BLLN BillionToOne, Inc. | Tsao David | Chief Technology Officer, Director | Gift | $0 |
| Aug 27 | BLLN BillionToOne, Inc. | Tsao David | Chief Technology Officer, Director | Sell | $1.0M |
| Aug 12 | BLLN BillionToOne, Inc. | Tsao David | Chief Technology Officer, Director | Sell | $928.6K |
| Jul 15 | BLLN BillionToOne, Inc. | Tsao David | Chief Technology Officer, Director | Sell | $2.5M |
| Jun 17 | BLLN BillionToOne, Inc. | Tsao David | Chief Technology Officer, Director | Sell | $2.0M |
| Nov 12 | BLLN BillionToOne, Inc. | Tsao David | Insider | Buy | $60.0K |
| Nov 5 | BLLN BillionToOne, Inc. | Tsao David | Insider | Other | $0 |
9 filings