Tsao David
Chief Technology Officer
Tsao David has filed 7 SEC Form 4 filings (39 transaction rows) across 1 company, with disclosures dating back to 2025. 7 of those filings fall inside the rolling window. Most recent filing: Sep 11, 2026.
On the most recent filing, Tsao David is listed as Chief Technology Officer at BillionToOne, Inc. Inside the rolling window, Tsao David reported 1 open-market purchase totaling $60K in BLLN and 5 open-market sales totaling $8.4M in BLLN. The largest disclosed transaction in the window is a sale of 20,000 BLLN shares on Jul 13, 2026, worth $2.5M.
Companies traded
Other insiders at BLLN
Insider Buying
$60K
reported purchases (SEC code P)
Insider Selling
$8.4M
reported sales (SEC code S)
Companies
1
in the rolling window
| Source | |||||||
|---|---|---|---|---|---|---|---|
| BLLN | Chief Technology Officer | Sale | 20,000 | $2.0M | Sep 11 | SEC ↗ | |
| BLLN | Chief Technology Officer | Sale | 10,000 | $1.0M | Aug 28 | SEC ↗ | |
| BLLN | Chief Technology Officer | Sale | 10,000 | $929K | Aug 12 | SEC ↗ | |
| BLLN | Chief Technology Officer | Sale | 20,000 | $2.5M | Jul 15 | SEC ↗ | |
| BLLN | Chief Technology Officer | Sale | 20,000 | $2.0M | Jun 17 | SEC ↗ | |
| BLLN | Chief Technology Officer | Purchase | 1,000 | $60K | Nov 12 | SEC ↗ |
Frequently asked questions
How many SEC Form 4 filings has Tsao David made?
Tsao David has filed 7 SEC Form 4 filings (39 transaction rows) across 1 company since 2025.
Which companies does Tsao David trade?
Tsao David has filed SEC Form 4 disclosures for 1 company, including BLLN.
When was Tsao David's most recent SEC Form 4 filing?
Tsao David's most recent SEC Form 4 filing on Tracefour is dated Sep 11, 2026.
What is Tsao David's job title?
On the most recent SEC Form 4 filings tracked by Tracefour, Tsao David is listed as Chief Technology Officer.
What is Tsao David's total buy and sell value in the current window?
Inside the rolling retention window, Tsao David bought $60K and sold $8.4M based on SEC Form 4 filings.
What was Tsao David's largest disclosed transaction?
The largest disclosed transaction in the current window is a sale of 20,000 BLLN shares on 2026-07-13, worth $2.5M, per SEC Form 4 filings.