Tsao David
Chief Technology Officer
Exercise
Calculated transaction value
$28K
10,000 shares @ $2.8
Traded
Nov 2, 2026
Filed
Nov 4, 2026
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BillionToOne
BLLN
ServicesEducational Services
Transactions reported in official disclosures
Price with disclosed trades
Daily closes, past year · marks sit on transaction dates, sized by value
363 trades
| Reporting person | Filed | Transaction | Transaction value | Source | Actions |
|---|---|---|---|---|---|
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Exercise Nov 2, 2026 | $28K Filed shares x price | SEC Form 4 View filing | |
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Sale Nov 2, 2026 | $353K Filed shares x price | SEC Form 4 View filing | |
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Sale Nov 2, 2026 | $114.09K Filed shares x price | SEC Form 4 View filing | |
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Sale Nov 2, 2026 | $23.3K Filed shares x price | SEC Form 4 View filing | |
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Sale Nov 2, 2026 | $265.54K Filed shares x price | SEC Form 4 View filing | |
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Exercise Nov 2, 2026 | $28K Filed shares x price | SEC Form 4 View filing | |
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Exercise Nov 2, 2026 | $28K Filed shares x price | SEC Form 4 View filing | |
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Sale Nov 2, 2026 | $70.35K Filed shares x price | SEC Form 4 View filing | |
| Tsao David Chief Technology Officer | Nov 4, 2026 2-day lag | Sale Nov 2, 2026 | $251.11K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 30, 2026 2-day lag | Exercise Oct 28, 2026 | $23.33K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 30, 2026 2-day lag | Sale Oct 28, 2026 | $314.71K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 30, 2026 2-day lag | Exercise Oct 28, 2026 | $23.33K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 30, 2026 2-day lag | Sale Oct 28, 2026 | $983.29K Filed shares x price | SEC Form 4 View filing | |
| Lynch Thomas P. See Remarks | Oct 19, 2026 6-day lag | Exercise Oct 13, 2026 | $17.3K Filed shares x price | SEC Form 4 View filing | |
| Lynch Thomas P. See Remarks | Oct 19, 2026 6-day lag | Exercise Oct 13, 2026 | $17.3K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 1-day lag | Exercise Oct 15, 2026 | $14.42K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 1-day lag | Sale Oct 15, 2026 | $88.59K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 1-day lag | Sale Oct 15, 2026 | $128.37K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 1-day lag | Sale Oct 15, 2026 | $13.67K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 1-day lag | Exercise Oct 15, 2026 | $14.42K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 1-day lag | Sale Oct 15, 2026 | $99.75K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 1-day lag | Sale Oct 15, 2026 | $185.81K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 2-day lag | Sale Oct 14, 2026 | $303.12K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 2-day lag | Exercise Oct 14, 2026 | $8.91K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 2-day lag | Exercise Oct 14, 2026 | $8.91K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 2-day lag | Sale Oct 14, 2026 | $261.37K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 16, 2026 2-day lag | Sale Oct 14, 2026 | $9.9K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 14, 2026 2-day lag | Sale Oct 12, 2026 | $366.06K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 14, 2026 2-day lag | Sale Oct 12, 2026 | $633.33K Filed shares x price | SEC Form 4 View filing | |
| Atay Oguzhan Chairman And CEO | Oct 14, 2026 2-day lag | Sale Oct 12, 2026 | $179.57K Filed shares x price | SEC Form 4 View filing |
Tsao David
Chief Technology Officer
Sale
Calculated transaction value
$353K
3,234 shares @ $109.15
Traded
Nov 2, 2026
Filed
Nov 4, 2026
Tsao David
Chief Technology Officer
Sale
Calculated transaction value
$114.09K
1,063 shares @ $107.33
Traded
Nov 2, 2026
Filed
Nov 4, 2026
Tsao David
Chief Technology Officer
Sale
Calculated transaction value
$23.3K
208 shares @ $112.01
Traded
Nov 2, 2026
Filed
Nov 4, 2026
Tsao David
Chief Technology Officer
Sale
Calculated transaction value
$265.54K
2,450 shares @ $108.39
Traded
Nov 2, 2026
Filed
Nov 4, 2026
Tsao David
Chief Technology Officer
Exercise
Calculated transaction value
$28K
10,000 shares @ $2.8
Traded
Nov 2, 2026
Filed
Nov 4, 2026
Tsao David
Chief Technology Officer
Exercise
Calculated transaction value
$28K
10,000 shares @ $2.8
Traded
Nov 2, 2026
Filed
Nov 4, 2026
Tsao David
Chief Technology Officer
Sale
Calculated transaction value
$70.35K
633 shares @ $111.14
Traded
Nov 2, 2026
Filed
Nov 4, 2026
Tsao David
Chief Technology Officer
Sale
Calculated transaction value
$251.11K
2,320 shares @ $108.24
Traded
Nov 2, 2026
Filed
Nov 4, 2026
Atay Oguzhan
Chairman And CEO
Exercise
Calculated transaction value
$23.33K
8,333 shares @ $2.8
Traded
Oct 28, 2026
Filed
Oct 30, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$314.71K
2,667 shares @ $118
Traded
Oct 28, 2026
Filed
Oct 30, 2026
Atay Oguzhan
Chairman And CEO
Exercise
Calculated transaction value
$23.33K
8,333 shares @ $2.8
Traded
Oct 28, 2026
Filed
Oct 30, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$983.29K
8,333 shares @ $118
Traded
Oct 28, 2026
Filed
Oct 30, 2026
Lynch Thomas P.
See Remarks
Exercise
Calculated transaction value
$17.3K
2,000 shares @ $8.65
Traded
Oct 13, 2026
Filed
Oct 19, 2026
Lynch Thomas P.
See Remarks
Exercise
Calculated transaction value
$17.3K
2,000 shares @ $8.65
Traded
Oct 13, 2026
Filed
Oct 19, 2026
Atay Oguzhan
Chairman And CEO
Exercise
Calculated transaction value
$14.42K
5,150 shares @ $2.8
Traded
Oct 15, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$88.59K
900 shares @ $98.43
Traded
Oct 15, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$128.37K
1,276 shares @ $100.6
Traded
Oct 15, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$13.67K
133 shares @ $102.78
Traded
Oct 15, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Exercise
Calculated transaction value
$14.42K
5,150 shares @ $2.8
Traded
Oct 15, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$99.75K
980 shares @ $101.79
Traded
Oct 15, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$185.81K
1,861 shares @ $99.84
Traded
Oct 15, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$303.12K
3,083 shares @ $98.32
Traded
Oct 14, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Exercise
Calculated transaction value
$8.91K
3,183 shares @ $2.8
Traded
Oct 14, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Exercise
Calculated transaction value
$8.91K
3,183 shares @ $2.8
Traded
Oct 14, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$261.37K
2,667 shares @ $98
Traded
Oct 14, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$9.9K
100 shares @ $99
Traded
Oct 14, 2026
Filed
Oct 16, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$366.06K
3,869 shares @ $94.61
Traded
Oct 12, 2026
Filed
Oct 14, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$633.33K
6,763 shares @ $93.65
Traded
Oct 12, 2026
Filed
Oct 14, 2026
Atay Oguzhan
Chairman And CEO
Sale
Calculated transaction value
$179.57K
1,961 shares @ $91.57
Traded
Oct 12, 2026
Filed
Oct 14, 2026