BLLN insider buying and SEC filings, explained
BillionToOne, Inc. · CIK 2070849
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$3.2M
Insiders who bought
5
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$52.6M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 28, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 11,000 shares directly and indirectly (by spouse) at $118.00 ($1.3M), marked as a 10b5-1 plan trade. Direct holdings down 100% to 0 shares. | SEC filing Filed Oct 30, 2026, 6:54 PM ET |
| Oct 14–15, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 11,000 shares directly and indirectly (by spouse) between Oct 14 and Oct 15 at about $99.14 ($1.1M), marked as a 10b5-1 plan trade. Direct holdings down 100% to 0 shares. | SEC filing Filed Oct 16, 2026, 7:00 PM ET |
| Oct 12, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 19,334 shares directly and indirectly (by spouse) at about $94.31 ($1.8M), marked as a 10b5-1 plan trade. Direct holdings down 100% to 0 shares. | SEC filing Filed Oct 14, 2026, 6:10 PM ET |
| Oct 5, 2026 | Planned (10b5-1) | Bosch John Roderick ten (SVP of Laboratory Operations) sold 2,834 shares at $105.15 ($298K), marked as a 10b5-1 plan trade. Holdings down 13% to 19,385 shares. | SEC filing Filed Oct 7, 2026, 7:56 PM ET |
| Oct 5, 2026 | Planned (10b5-1) | David Tsao (Chief Technology Officer and Director) sold 20,000 shares at about $108.15 ($2.2M), marked as a 10b5-1 plan trade. Holdings down 95% to 1,000 shares. | SEC filing Filed Oct 7, 2026, 7:56 PM ET |
| Sep 28, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 10,999 shares directly and indirectly (by spouse) at $120.64 ($1.3M), marked as a 10b5-1 plan trade. Direct holdings down 100% to 0 shares. | SEC filing Filed Sep 30, 2026 |
| Sep 24, 2026 | Planned (10b5-1) | David Tsao (Chief Technology Officer and Director) sold 3,333 shares at $125.00 ($417K), marked as a 10b5-1 plan trade. Holdings down 77% to 1,000 shares. | SEC filing Filed Sep 28, 2026 |
| Sep 24, 2026 | Planned (10b5-1) | Bosch John Roderick ten (SVP of Laboratory Operations) sold 1,416 shares at $120.00 ($170K), marked as a 10b5-1 plan trade. Holdings down 6% to 22,219 shares. | SEC filing Filed Sep 28, 2026 |
| Sep 21, 2026 | Planned (10b5-1) | Bosch John Roderick ten (SVP of Laboratory Operations) sold 1,416 shares at $106.61 ($151K), marked as a 10b5-1 plan trade. Holdings down 6% to 23,635 shares. | SEC filing Filed Sep 23, 2026 |
| Sep 17, 2026 | Planned (10b5-1) | Thomas P. Lynch (Chief Compliance Officer) sold 35,112 shares at about $110.33 ($3.9M), marked as a 10b5-1 plan trade. Holdings down 98% to 700 shares. | SEC filing Filed Sep 21, 2026 |
| Sep 14, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 30,331 shares directly and indirectly (by spouse) at about $99.91 ($3.0M), marked as a 10b5-1 plan trade. Direct holdings down 100% to 0 shares. | SEC filing Filed Sep 16, 2026 |
| Sep 9, 2026 | Planned (10b5-1) | David Tsao (Chief Technology Officer and Director) sold 20,000 shares at about $98.77 ($2.0M), marked as a 10b5-1 plan trade. Holdings down 95% to 1,000 shares. | SEC filing Filed Sep 11, 2026 |
| Sep 9, 2026 | Planned (10b5-1) | Bosch John Roderick ten (SVP of Laboratory Operations) sold 1,416 shares at $97.54 ($138K), marked as a 10b5-1 plan trade. Holdings down 5% to 25,051 shares. | SEC filing Filed Sep 11, 2026 |
| Sep 8, 2026 | Planned (10b5-1) | Thomas P. Lynch (Chief Compliance Officer) sold 20,000 shares at about $99.99 ($2.0M), marked as a 10b5-1 plan trade. Holdings down 97% to 700 shares. | SEC filing Filed Sep 10, 2026 |
| Aug 25, 2026 | Planned (10b5-1) | David Tsao (Chief Technology Officer and Director) sold 10,000 shares at $100.00 ($1.0M), marked as a 10b5-1 plan trade. Holdings down 91% to 1,000 shares. | SEC filing Filed Aug 27, 2026 |
| Aug 25, 2026 | Planned (10b5-1) | Bosch John Roderick ten (SVP of Laboratory Operations) sold 1,417 shares at $100.00 ($142K), marked as a 10b5-1 plan trade. Holdings down 5% to 26,467 shares. | SEC filing Filed Aug 27, 2026 |
| Aug 10, 2026 | Planned (10b5-1) | Bosch John Roderick ten (SVP of Laboratory Operations) sold 1,417 shares at $92.86 ($132K), marked as a 10b5-1 plan trade. Holdings down 5% to 27,884 shares. | SEC filing Filed Aug 12, 2026 |
| Aug 10, 2026 | Planned (10b5-1) | David Tsao (Chief Technology Officer and Director) sold 10,000 shares at $92.86 ($929K), marked as a 10b5-1 plan trade. Holdings down 91% to 1,000 shares. | SEC filing Filed Aug 12, 2026 |
| Aug 5, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 15,539 shares at about $150.03 ($2.3M), marked as a 10b5-1 plan trade. Holdings down 100% to 0 shares. | SEC filing Filed Aug 7, 2026 |
| Aug 3, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 45,000 shares directly and indirectly (by spouse) at about $137.07 ($6.2M), marked as a 10b5-1 plan trade. Direct holdings down 100% to 0 shares. | SEC filing Filed Aug 5, 2026 |
| Jul 31, 2026 | Planned (10b5-1) | Shan Riku Sakakibara (Chief Product Officer) sold 4,000 shares at $140.21 ($561K), marked as a 10b5-1 plan trade. Holdings down 2% to 200,000 shares. | SEC filing Filed Aug 4, 2026 |
| Jul 16, 2026 | Planned (10b5-1) | Nancy JoAnn Johnson (Officer) sold 14,199 shares at about $128.30 ($1.8M), marked as a 10b5-1 plan trade. Holdings down 67% to 6,900 shares. | SEC filing Filed Jul 20, 2026 |
| Jul 13, 2026 | Planned (10b5-1) | David Tsao (Chief Technology Officer and Director) sold 20,000 shares at about $124.89 ($2.5M), marked as a 10b5-1 plan trade. Holdings down 95% to 1,000 shares. | SEC filing Filed Jul 15, 2026 |
| Jul 13, 2026 | Planned (10b5-1) | Bosch John Roderick ten (SVP of Laboratory Operations) sold 4,251 shares at $125.46 ($533K), marked as a 10b5-1 plan trade. Holdings down 13% to 29,301 shares. | SEC filing Filed Jul 15, 2026 |
| Jul 9, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 12,500 shares at about $126.10 ($1.6M), marked as a 10b5-1 plan trade. Holdings down 100% to 0 shares. | SEC filing Filed Jul 13, 2026 |
| Jul 9, 2026 | Planned (10b5-1) | Shan Riku Sakakibara (Chief Product Officer) sold 8,000 shares at $125.00 ($1.0M), marked as a 10b5-1 plan trade. Holdings down 4% to 204,000 shares. | SEC filing Filed Jul 13, 2026 |
| Jul 6, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 38,750 shares directly and indirectly (by spouse) at about $122.05 ($4.7M), marked as a 10b5-1 plan trade. Direct holdings down 100% to 0 shares. | SEC filing Filed Jul 8, 2026 |
| Jul 1, 2026 | Planned (10b5-1) | Nancy JoAnn Johnson (Officer) sold 801 shares at about $124.91 ($100K), marked as a 10b5-1 plan trade. Holdings down 4% to 21,099 shares. | SEC filing Filed Jul 6, 2026 |
| Jun 29, 2026 | Planned (10b5-1) | Bosch John Roderick ten (SVP of Laboratory Operations) sold 1,416 shares at $120.00 ($170K), marked as a 10b5-1 plan trade. Holdings down 4% to 33,552 shares. | SEC filing Filed Jul 1, 2026 |
| Jun 24, 2026 | Planned (10b5-1) | Shan Riku Sakakibara (Chief Product Officer) sold 8,000 shares at $110.00 ($880K), marked as a 10b5-1 plan trade. Holdings down 4% to 208,000 shares. | SEC filing Filed Jun 26, 2026 |
| Jun 15, 2026 | Planned (10b5-1) | David Tsao (Chief Technology Officer and Director) sold 20,000 shares at about $102.26 ($2.0M), marked as a 10b5-1 plan trade. Holdings down 95% to 1,000 shares. | SEC filing Filed Jun 17, 2026 |
| Jun 15, 2026 | Planned (10b5-1) | Bosch John Roderick ten (Officer) sold 2,832 shares at $101.47 ($287K), marked as a 10b5-1 plan trade. Holdings down 7% to 34,968 shares. | SEC filing Filed Jun 17, 2026 |
| Jun 8, 2026 | Planned (10b5-1) | Oguzhan Atay (CEO and Director) sold 38,750 shares directly and indirectly (by spouse) at about $97.84 ($3.8M), marked as a 10b5-1 plan trade. Direct holdings down 100% to 0 shares. | SEC filing Filed Jun 10, 2026 |
| Jun 8, 2026 | Planned (10b5-1) | Shan Riku Sakakibara (Chief Product Officer) sold 8,000 shares at about $98.23 ($786K), marked as a 10b5-1 plan trade. Holdings down 4% to 212,000 shares. | SEC filing Filed Jun 10, 2026 |
| Jun 8–9, 2026 | Planned (10b5-1) | Nancy JoAnn Johnson (Officer) sold 14,000 shares between Jun 8 and Jun 9 at about $100.18 ($1.4M), marked as a 10b5-1 plan trade. Holdings down 39% to 21,900 shares. | SEC filing Filed Jun 10, 2026 |
| Nov 7, 2025 | Purchase (code P) | Thomas P. Lynch (Chief Compliance Officer) bought 100 shares at $60.00 ($6K), reported as a purchase (code P). Holdings up 17% to 700 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 12, 2025 |
| Nov 7, 2025 | Purchase (code P) | David Tsao (Chief Technology Officer and Director) bought 1,000 shares at $60.00 ($60K), reported as a purchase (code P). New position of 1,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 12, 2025 |
| Nov 7, 2025 | Purchase (code P) | Bosch John Roderick ten (Officer) bought 800 shares at $60.00 ($48K), reported as a purchase (code P). Holdings up 2% to 37,800 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 12, 2025 |
| Nov 7, 2025 | Purchase (code P) | Nancy JoAnn Johnson (Officer) bought 6,900 shares at $60.00 ($414K), reported as a purchase (code P). Holdings up 24% to 35,900 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 12, 2025 |
| Nov 7, 2025 | Purchase (code P) | Akshay Rai (Director) bought 2,500 shares at $60.00 ($150K), reported as a purchase (code P). Holdings up 23% to 13,509 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 12, 2025 |
| Nov 7, 2025 | Purchase (code P) | Thomas S Bremner (Director) bought 41,666 shares indirectly at $60.00 ($2.5M), reported as a purchase (code P). Indirect holdings up 6% to 693,143 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 10, 2025 |
51 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
5 insiders bought in 30 days
$3.2M in purchases since Nov 7, 2025 · Purchases traded Nov 7, 2025 to Nov 7, 2025 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Thomas S Bremner (Director) | $2.5M | Nov 7, 2025 | SEC filing |
| Akshay Rai (Director) | $150K | Nov 7, 2025 | SEC filing |
| Nancy JoAnn Johnson (Officer) | $414K | Nov 7, 2025 | SEC filing |
| Bosch John Roderick ten (Officer) | $48K | Nov 7, 2025 | SEC filing |
| David Tsao (Chief Technology Officer) | $60K | Nov 7, 2025 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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