BillionToOne, Inc. (BLLN) Institutional Shareholders
BillionToOne, Inc. (BLLN) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $1.81B in BLLN holdings during the latest filing period.
Adams Street Partners Llc is currently the largest disclosed institutional shareholder of BLLN tracked by InsiderSet, reporting ownership valued at approximately $205.34M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $181.27M, representing an estimated loss of -11.72% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 57% of the total disclosed BLLN value among the investors covered in this analysis. Major shareholders include Adams Street Partners Llc, Price T Rowe Associates Inc, Baillie Gifford & Co, and several other long-term asset managers with concentrated positions in BillionToOne, Inc. (BLLN).
This page ranks the largest institutional BLLN shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
153
Total Reported Value
$1.81B
Largest Holder
Adams Street Partners Llc
Largest Position
$205.34M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
180
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Adams Street Partners Llc | 46.39% | 1,711,430 | $205,337,371 | $181,274,666 | -$24,062,705 | -11.72% | |
| Price T Rowe Associates Inc | 0.01% | 1,010,322 | $121,220,000 | $107,013,306 | -$14,206,694 | -11.72% | |
| Baillie Gifford & Co | 0.10% | 901,420 | $108,152,370 | $95,478,406 | -$12,673,964 | -11.72% | |
| Vanguard Portfolio Management Llc | 0.00% | 840,970 | $100,899,581 | $89,075,542 | -$11,824,039 | -11.72% | |
| Invesco Ltd. | 0.01% | 835,614 | $100,256,968 | $88,508,235 | -$11,748,733 | -11.72% | |
| Vanguard Capital Management Llc | 0.00% | 799,468 | $95,920,171 | $84,679,651 | -$11,240,520 | -11.72% | |
| Neuberger Berman Group Llc | 0.06% | 764,215 | $91,690,517 | $80,945,653 | -$10,744,864 | -11.72% | |
| Bamco Inc | 0.13% | 742,093 | $89,036,318 | $78,602,491 | -$10,433,827 | -11.72% | |
| Wasatch Advisors Lp | 0.41% | 518,084 | $62,159,718 | $54,875,457 | -$7,284,261 | -11.72% | |
| Millennium Management Llc | 0.03% | 425,032 | $50,995,339 | $45,019,389 | -$5,975,950 | -11.72% | |
| Fuller & Thaler Asset Management, Inc. | 0.14% | 418,565 | $50,219,447 | $44,334,405 | -$5,885,042 | -11.72% | |
| Emerald Advisers, Llc | 1.06% | 375,858 | $45,095,443 | $39,810,879 | -$5,284,564 | -11.72% | |
| Next Century Growth Investors Llc | 2.32% | 364,467 | $43,728,750 | $38,604,345 | -$5,124,405 | -11.72% | |
| Ubs Group Ag | 0.01% | 344,287 | $41,307,554 | $36,466,879 | -$4,840,675 | -11.72% | |
| Jpmorgan Chase & Co | 0.00% | 340,371 | $41,013,056 | $36,052,096 | -$4,960,960 | -12.10% | |
| Ameriprise Financial Inc | 0.01% | 320,612 | $38,497,422 | $33,959,223 | -$4,538,199 | -11.79% | |
| Oberweis Asset Management Inc/ | 0.74% | 299,030 | $35,877,619 | $31,673,258 | -$4,204,361 | -11.72% | |
| Wells Fargo & Company/Mn | 0.01% | 271,554 | $32,581,049 | $28,763,000 | -$3,818,049 | -11.72% | |
| Napean Trading & Investment Co (Singapore) Pte Ltd | 9.62% | 233,333 | $27,995,293 | $24,714,631 | -$3,280,662 | -11.72% | |
| Emerald Mutual Fund Advisers Trust | 0.86% | 203,990 | $24,474,720 | $21,606,621 | -$2,868,099 | -11.72% | |
| Alliancebernstein L.P. | 0.01% | 262,103 | $20,690,411 | $27,761,950 | +$7,071,539 | +34.18% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 240,587 | $18,991,938 | $25,482,975 | +$6,491,037 | +34.18% | |
| Penn Capital Management Company, Llc | 0.99% | 129,602 | $15,549,648 | $13,727,444 | -$1,822,204 | -11.72% | |
| Bnp Paribas Financial Markets | 0.01% | 122,527 | $14,700,789 | $12,978,060 | -$1,722,729 | -11.72% | |
| Goldman Sachs Group Inc | 0.00% | 120,325 | $14,436,593 | $12,744,824 | -$1,691,769 | -11.72% | |
| New York State Common Retirement Fund | 0.02% | 117,771 | $14,130,165 | $12,474,304 | -$1,655,861 | -11.72% | |
| Voloridge Investment Management, Llc | 0.06% | 117,063 | $14,045,219 | $12,399,313 | -$1,645,906 | -11.72% | |
| Blackrock, Inc. | 0.00% | 114,281 | $13,711,434 | $12,104,644 | -$1,606,790 | -11.72% | |
| Fred Alger Management, Llc | 0.05% | 114,123 | $13,692,478 | $12,087,908 | -$1,604,570 | -11.72% | |
| Renaissance Technologies LLC | Jim Simons | 0.02% | 96,600 | $11,590,068 | $10,231,872 | -$1,358,196 | -11.72% |
| T. Rowe Price Investment Management, Inc. | 0.01% | 92,957 | $11,153,000 | $9,846,005 | -$1,306,995 | -11.72% | |
| Geode Capital Management, Llc | 0.00% | 87,934 | $10,553,783 | $9,313,969 | -$1,239,814 | -11.75% | |
| Perceptive Advisors Llc | 0.16% | 86,812 | $10,415,704 | $9,195,127 | -$1,220,577 | -11.72% | |
| Lord, Abbett & Co. Llc | 0.03% | 86,293 | $10,353,000 | $9,140,155 | -$1,212,845 | -11.71% | |
| Healthcare Of Ontario Pension Plan Trust Fund | 0.01% | 83,300 | $9,994,334 | $8,823,136 | -$1,171,198 | -11.72% | |
| Hrt Financial Lp | 0.02% | 80,709 | $9,683,000 | $8,548,697 | -$1,134,303 | -11.71% | |
| Massachusetts Financial Services Co | 0.00% | 78,977 | $9,475,661 | $8,365,244 | -$1,110,417 | -11.72% | |
| Greenwich Wealth Management Llc | 0.31% | 71,625 | $8,594,000 | $7,586,520 | -$1,007,480 | -11.72% | |
| Blue Water Life Science Advisors, Lp | 5.29% | 70,000 | $8,398,600 | $7,414,400 | -$984,200 | -11.72% | |
| Td Asset Management Inc | 0.01% | 63,482 | $7,616,570 | $6,724,013 | -$892,557 | -11.72% | |
| Bank Of America Corp | 0.00% | 59,040 | $7,083,619 | $6,253,517 | -$830,102 | -11.72% | |
| Verition Fund Management Llc | 0.05% | 57,000 | $6,838,860 | $6,037,440 | -$801,420 | -11.72% | |
| Susquehanna International Group, Llp | 0.01% | 54,598 | $6,550,668 | $5,783,020 | -$767,648 | -11.72% | |
| Jump Financial, Llc | 0.05% | 46,300 | $5,555,074 | $4,904,096 | -$650,978 | -11.72% | |
| Marshall Wace, Llp | 0.00% | 44,662 | $5,358,546 | $4,730,599 | -$627,947 | -11.72% | |
| Fox Hill Wealth Management | 2.10% | 43,724 | $5,245,998 | $4,631,246 | -$614,752 | -11.72% | |
| F/M Investments Llc | 0.27% | 43,600 | $5,231,128 | $4,618,112 | -$613,016 | -11.72% | |
| Weiss Asset Management Lp | 0.06% | 43,057 | $5,165,979 | $4,560,597 | -$605,382 | -11.72% | |
| Vanguard Fiduciary Trust Co | 0.00% | 42,874 | $5,144,023 | $4,541,214 | -$602,809 | -11.72% | |
| Manufacturers Life Insurance Company, The | 0.00% | 41,697 | $5,002,806 | $4,416,546 | -$586,260 | -11.72% |
Frequently asked questions about BLLN
Who owns the most BLLN stock?
The largest holders of BLLN are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for BillionToOne, Inc. (BLLN).
Is BLLN widely held by superinvestors?
Many widely followed stocks like BLLN appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly BLLN is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.