Who
David Tsao
Chief Technology Officer
Company insider
Files Form 4 as: Chief Technology Officer, BillionToOne.
In numbers
- Trades disclosed
- 118
- Buys
- 1
- Sells
- 7
- Bought
- $60K
- Sold
- $19.9M
- Companies
- 1
- Companies where not an officer
- 0
- First trade
- 7 Nov 2025
- Last trade
- 5 Oct 2026
- Last filed
- 7 Oct 2026
Companies traded
Activity over time
1 Nov 2025 – 1 Oct 2026
Buys above the line, sells below, each month.
Every trade
| Traded | Company | What | Amount | |
|---|---|---|---|---|
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Code M | $28K10,000 at $2.80 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $236K2,200 at $107.47 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $534K4,916 at $108.53 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $200K1,829 at $109.14 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $11K100 at $110.09 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneoption or derivative · Diagnostics & Labs | SEC FORM 4 Code M | $28K10,000 at $2.80 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneoption or derivative · Diagnostics & Labs | SEC FORM 4 Code M | $28K10,000 at $2.80 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Code M | $28K10,000 at $2.80 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $92K866 at $105.90 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $205K1,909 at $107.20 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $464K4,284 at $108.39 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $318K2,921 at $109.00 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $2,20220 at $110.08 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $59K555 at $105.56 | filing |
| 5 Oct 2026filed 7 Oct 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $42K400 at $106.10 | filing |
| 24 Sep 2026filed 28 Sep 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Code M | $9,3323,333 at $2.80 | filing |
| 24 Sep 2026filed 28 Sep 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Sold | $417K3,333 at $125.00 | filing |
| 24 Sep 2026filed 28 Sep 2026 | BLLN BillionToOneoption or derivative · Diagnostics & Labs | SEC FORM 4 Code M | $9,3323,333 at $2.80 | filing |
| 24 Sep 2026filed 28 Sep 2026 | BLLN BillionToOneoption or derivative · Diagnostics & Labs | SEC FORM 4 Code M | $9,3323,333 at $2.80 | filing |
| 24 Sep 2026filed 28 Sep 2026 | BLLN BillionToOneDiagnostics & Labs | SEC FORM 4 Code M | $9,3323,333 at $2.80 | filing |
News
Analyzing Community Health Systems (NYSE:CYH) and Billiontoone (NASDAQ:BLLN)BLLN · tickerreport.com · 18 Oct 2026Billiontoone (NASDAQ:BLLN) Stock: Insider Oguzhan Atay Sells 5,150 SharesBLLN · themarketsdaily.com · 17 Oct 2026Insider Selling: Billiontoone (NASDAQ:BLLN) CEO Sells $313,016.22 in StockBLLN · tickerreport.com · 17 Oct 2026
0 headlines in the last 90 days name David Tsao; 3 articles from the last 14 days about the 1 company they traded most, at most three about any one of them.