BLLN
BillionToOne, Inc.
121.70$
-1.1%
vs. previous close
Closing price · As of: Sep 28, 2026
Ownership
Ownership Structure
Who owns BillionToOne, Inc. (BLLN)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 67.6% of the shares are freely tradable; institutional investors hold 35.6%.
Institutional ownership
?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
35.6%
Insiders
?Share of the stock held by the executives, founders and major shareholders of the company itself.
37.1%
Float
?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
67.6%
Short % of float
?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
9.0%
Shares Outstanding
?Total number of shares issued. Price times share count gives market cap.
43Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Adams Street Partners LLC | 3.63 | 1,711,430 | +0.0 | 06/30/2026 |
| Civilization Ventures Management, LLC | 2.33 | 1,099,431 | +0.0 | 03/31/2026 |
| Baillie Gifford & Co Limited. | 1.91 | 901,420 | -28.5 | 06/30/2026 |
| BAMCO Inc | 1.57 | 741,485 | +336.2 | 03/31/2026 |
| T. Rowe Price Associates, Inc. | 1.56 | 737,518 | +52.0 | 03/31/2026 |
| Neuberger Berman Group LLC | 1.50 | 709,214 | +1.2 | 03/31/2026 |
| Wasatch Advisors LP | 1.10 | 518,084 | +40.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 1.54 | 725,810 | -0.1 | 08/31/2026 |
| Vanguard Small Cap Index | 1.11 | 524,067 | +0.0 | 08/31/2026 |
| Invesco Discovery A | 1.03 | 487,500 | +2.0 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Sakakibara Shan Riku | Chief Product Officer | 196,500 | 23,914,050 $ | Sep 10, 2026 | direct |
| Atay Oguzhan | Chairman and CEO | 157,168 | 19,127,346 $ | Sep 14, 2026 | both |
| Kolluri Krishna Kittu | Director | 57,839 | 7,039,006 $ | Aug 26, 2026 | indirect |
| ten Bosch John Roderick | SVP of Laboratory Operations | 23,635 | 2,876,380 $ | Sep 21, 2026 | direct |
| Tsao David | Chief Technology Officer | 1,000 | 121,700 $ | Sep 9, 2026 | direct |
| Lynch Thomas P. | See Remarks | 700 | 85,190 $ | Sep 17, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 21, 2026 | ten Bosch John Roderick | SVP of Laboratory Operations | Sell | 1,416 | 106.61 | 150,960 |
| Sep 17, 2026 | Lynch Thomas P. | See Remarks | Sell | 5,840 | 110.29 | 644,112 |
| Sep 17, 2026 | Lynch Thomas P. | See Remarks | Sell | 2,920 | 110.31 | 322,100 |
| Sep 17, 2026 | Lynch Thomas P. | See Remarks | Sell | 6,968 | 110.30 | 768,561 |
| Sep 17, 2026 | Lynch Thomas P. | See Remarks | Sell | 19,384 | 110.36 | 2,139,193 |
| Sep 17, 2026 | Lynch Thomas P. | See Remarks | Other | 5,840 | 30.78 | 179,755 |
| Sep 17, 2026 | Lynch Thomas P. | See Remarks | Other | 2,920 | 17.12 | 49,990 |
| Sep 17, 2026 | Lynch Thomas P. | See Remarks | Other | 6,968 | 11.55 | 80,480 |
| Sep 17, 2026 | Lynch Thomas P. | See Remarks | Other | 19,384 | 8.65 | 167,672 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 2,666 | 98.00 | 261,268 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 3,143 | 101.49 | 318,989 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 2,010 | 100.78 | 202,559 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 1,500 | 99.57 | 149,352 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 1,680 | 98.64 | 165,708 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 7,214 | 101.44 | 731,793 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 2,531 | 100.58 | 254,570 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 2,456 | 99.57 | 244,547 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Sell | 4,465 | 98.63 | 440,389 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Other | 8,333 | 2.80 | 23,332 |
| Sep 14, 2026 | Atay Oguzhan | Chairman and CEO | Other | 16,666 | 2.80 | 46,665 |
| Sep 10, 2026 | Sakakibara Shan Riku | Chief Product Officer | Other | 3,500 | 0.00 | – |
| Sep 9, 2026 | Tsao David | Chief Technology Officer | Sell | 10,000 | 100.00 | 1,000,000 |
| Sep 9, 2026 | Tsao David | Chief Technology Officer | Other | 10,000 | 2.80 | 28,000 |
| Sep 9, 2026 | ten Bosch John Roderick | SVP of Laboratory Operations | Sell | 1,416 | 97.54 | 138,117 |
| Sep 9, 2026 | Atay Oguzhan | Chairman and CEO | Other | 20,000 | 0.00 | – |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 232 | 100.92 | 23,414 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 2,518 | 100.20 | 252,293 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 576 | 98.89 | 56,960 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 147 | 101.41 | 14,907 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 1,131 | 100.33 | 113,469 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 385 | 99.22 | 38,201 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 358 | 100.82 | 36,095 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 2,997 | 100.11 | 300,040 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 614 | 99.00 | 60,785 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 775 | 100.83 | 78,142 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 8,285 | 100.12 | 829,517 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 1,944 | 98.97 | 192,390 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Sell | 38 | 96.47 | 3,666 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Other | 3,326 | 30.78 | 102,374 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Other | 1,663 | 17.12 | 28,471 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Other | 3,969 | 11.55 | 45,842 |
| Sep 8, 2026 | Lynch Thomas P. | See Remarks | Other | 11,042 | 8.65 | 95,513 |
| Sep 8, 2026 | Atay Oguzhan | Chairman and CEO | Other | 20,000 | 0.00 | – |
| Sep 8, 2026 | Tsao David | Chief Technology Officer | Other | 20,000 | 0.00 | – |
| Sep 3, 2026 | Tsao David | Chief Technology Officer | Other | 20,000 | 0.00 | – |
| Aug 26, 2026 | Kolluri Krishna Kittu | Director | Other | 5,644 | 0.00 | – |
| Aug 26, 2026 | Kolluri Krishna Kittu | Director | Other | 15,244 | 0.00 | – |
| Aug 26, 2026 | Kolluri Krishna Kittu | Director | Other | 1,666 | 0.00 | – |
| Aug 26, 2026 | Kolluri Krishna Kittu | Director | Other | 5,761 | 0.00 | – |
| Aug 26, 2026 | Kolluri Krishna Kittu | Director | Other | 719 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 28, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.