BLLN · BillionToOne, Inc. · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Superinvestors Holding BLLN
All superinvestors →Holder Concentration
Across 156 13F filersWho Holds BLLN
Last 4 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 155 filers, like-for-like change +34.7%; actively managed books +54.9%; index-like books +99.3%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 50.1% | 89 | +96.1% |
| Exempt adviser | 0.3% | 2 | -96.0% |
| Adviser | 27.7% | 7 | +8.0% |
| Bank | 7.2% | 12 | +148.4% |
| Broker-dealer | 0.0% | 1 | new |
| Benefit plan | 0.3% | 1 | +109.6% |
| Non-US | 1.5% | 6 | +837.9% |
| Holding company | 6.7% | 6 | +25.5% |
| Unknown | 6.1% | 31 | -15.5% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 10.4% | 11 | +99.3% |
| Systematic-like | 5.8% | 19 | +517.0% |
| Concentrated | 8.0% | 27 | -19.4% |
| Diversified active | 64.6% | 95 | +62.6% |
| Unknown | 11.2% | 3 | -39.1% |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 56.1% | 76 | +7.6% |
| Medium turnover | 25.4% | 39 | +138.0% |
| High turnover | 7.3% | 30 | +288.8% |
| Unknown | 11.2% | 10 | +17.3% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 12.5% | 25 | +27.5% |
| Medium horizon | 5.0% | 25 | -20.7% |
| Long horizon | 59.7% | 90 | +45.3% |
| Unknown | 22.8% | 15 | +34.2% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 14.1% | 34 | -39.9% |
| $1B to $10B | 12.2% | 36 | +104.5% |
| $10B to $100B | 18.0% | 38 | +90.9% |
| $100B or more | 55.7% | 47 | +57.8% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.5% | 34 | +3819.3% |
| Pooled investment vehicles | 7.0% | 23 | +162.7% |
| Registered funds and BDCs | 31.0% | 18 | +108.9% |
| Governments and sovereign funds | 3.5% | 3 | +45.8% |
| Other investment advisers | 0.0% | 2 | -3.3% |
| Other | 0.0% | 1 | new |
| Diversified | 7.0% | 8 | +25.7% |
| Unknown | 49.9% | 66 | +2.5% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 8.0% | 25 | +310.8% |
| Private equity funds | 0.1% | 4 | new |
| Venture capital funds | 0.1% | 2 | -99.0% |
| Real estate funds | 0.1% | 3 | +9117.3% |
| Securitized asset funds | 1.5% | 1 | -6.9% |
| Other private funds | 12.6% | 9 | +67.3% |
| Mixed private funds | 2.0% | 3 | -9.6% |
| Private funds, type not stated | 0.5% | 1 | -50.5% |
| No private funds | 25.5% | 43 | +126.3% |
| Unknown | 49.6% | 64 | +19.8% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 87.6% | 132 | +39.9% |
| Outside the US | 12.4% | 23 | +6.7% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Conviction and Crowding
155 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net sellers of $95,824,987 (1 buying, 1 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 89.0% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies BLLN's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | AGYS Agilysys Inc | 6 |
| 2 | GH Guardant Health, Inc. | 11 |
| 3 | MIRM Mirum Pharmaceuticals, Inc. | 8 |
| 4 | LIVN LivaNova PLC | 5 |
| 5 | ALMR Alamar Biosciences, Inc. | 3 |
| 6 | AXGN Axogen, Inc. | 5 |
| 7 | PDFS Pdf Solutions Inc | 5 |
| 8 | SKWD Skyward Specialty Insurance Group, Inc. | 4 |
| 9 | MXL Maxlinear, Inc | 6 |
| 10 | FRPT Freshpet, Inc. | 4 |
Shareholder Targets
13F filers that own its peers but not BLLN, quarter ended Jun 30, 2026Found through its holder-overlap peers: AGYS, GH, MIRM, LIVN, ALMR, AXGN, PDFS, SKWD, MXL, FRPT, RSI, IRTC, PVLA, FWRG, KVYO, EYE, OMDA, TXG, SYRE, TMDX. 1,268 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active | $1,113,881,462 14 held | FRPT, MIRM, EYE |
| 2 | Jupiter Topco LLC Unknown, Diversified active | $1,079,679,717 18 held | MIRM, SYRE, PDFS |
| 3 | Frazier Life Sciences Management, L.P. Registered adviser, Concentrated | $1,033,908,973 2 held | MIRM, PVLA |
| 4 | FRANKLIN RESOURCES INC Adviser, Diversified active | $969,033,785 18 held | GH, MIRM, SYRE |
| 5 | RTW INVESTMENTS, LP Registered adviser, Diversified active | $906,040,236 4 held | SYRE, IRTC, GH |
| 6 | Capital International Investors Adviser, Diversified active | $795,149,049 4 held | GH, KVYO, SYRE |
| 7 | DIMENSIONAL FUND ADVISORS LP Registered adviser, Diversified active | $774,565,187 15 held | LIVN, TXG, FRPT |
| 8 | Artisan Partners Limited Partnership Registered adviser, Diversified active | $744,743,129 7 held | GH, IRTC, LIVN |
| 9 | NORTHERN TRUST CORP Bank, Index-like | $724,554,002 20 held | MXL, GH, SYRE |
| 10 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Registered adviser, Diversified active | $699,132,970 8 held | GH, MIRM, FRPT |
Fund Ownership of BLLN by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 3.82% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 0.19% | 91,630 |
| Index ETFs | 3.63% | 1,712,399 |
| Active ETFs | 0.04% | 20,436 |
| Active funds | 8.05% | 3,799,999 |
| Unclassified | 0.14% | 65,646 |
| All registered funds | 12.06% | 5,690,110 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Small ADAMS STREET PARTNERS LLC Adviser | $205,337,371 | 11.14% | 1,711,430 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $121,218,432 | 6.58% | 1,010,322 | Shares | 2026-08-14 | |
| Mega BAILLIE GIFFORD & CO Adviser | $108,152,369 | 5.87% | 901,420 | Shares | 2026-08-06 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $100,899,580 | 5.47% | 840,970 | Shares | 2026-08-13 | |
| Mega Invesco Ltd. Adviser | $100,256,967 | 5.44% | 835,614 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $95,920,170 | 5.20% | 799,468 | Shares | 2026-08-13 | |
| Mega NEUBERGER BERMAN GROUP LLC Holding company | $91,690,515 | 4.97% | 764,215 | Shares | 2026-08-13 | |
| Large BAMCO INC /NY/ Registered adviser | $89,036,318 | 4.83% | 742,093 | Shares | 2026-08-14 | |
| Large WASATCH ADVISORS LP Registered adviser | $53,992,541 | 2.93% | 507,258 | Shares | 2026-10-13 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $50,995,339 | 2.77% | 425,032 | Shares | 2026-08-14 | |
| Large FULLER & THALER ASSET MANAGEMENT, INC. Registered adviser | $50,219,428 | 2.72% | 418,565 | Shares | 2026-08-12 | |
| Mid EMERALD ADVISERS, LLC Registered adviser | $45,095,442 | 2.45% | 375,858 | Shares | 2026-08-05 | |
| Mid NEXT CENTURY GROWTH INVESTORS LLC Adviser | $43,728,750 | 2.37% | 364,467 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $41,307,552 | 2.24% | 344,287 | Shares | 2026-08-13 | |
| Mega JPMORGAN CHASE & CO Bank | $40,837,710 | 2.22% | 340,371 | Shares | 2026-08-12 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $38,467,026 | 2.09% | 320,612 | Shares | 2026-08-14 | |
| Mid OBERWEIS ASSET MANAGEMENT INC/ Registered adviser | $35,877,619 | 1.95% | 299,030 | Shares | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $32,581,046 | 1.77% | 271,554 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $31,447,117 | 1.71% | 262,103 | Shares | 2026-08-14 | |
| Small Napean Trading & Investment Co (Singapore) PTE Ltd | $27,995,293 | 1.52% | 233,333 | Shares | 2026-08-12 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $26,867,479 | 1.46% | 223,933 | Shares | 2026-08-13 | |
| Mid EMERALD MUTUAL FUND ADVISERS TRUST Registered adviser | $24,474,720 | 1.33% | 203,990 | Shares | 2026-08-05 | |
| Mid Penn Capital Management Company, LLC Registered adviser | $15,549,647 | 0.84% | 129,602 | Shares | 2026-07-30 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $14,700,789 | 0.80% | 122,527 | Shares | 2026-08-13 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $14,436,593 | 0.78% | 120,325 | Shares | 2026-08-14 | |
| Large NEW YORK STATE COMMON RETIREMENT FUND | $14,130,164 | 0.77% | 117,771 | Shares | 2026-07-29 | |
| Large VOLORIDGE INVESTMENT MANAGEMENT, LLC Registered adviser | $14,045,218 | 0.76% | 117,063 | Shares | 2026-08-14 | |
| Mega BlackRock, Inc. Holding company | $13,711,434 | 0.74% | 114,281 | Shares | 2026-08-07 | |
| Large FRED ALGER MANAGEMENT, LLC Registered adviser | $13,692,477 | 0.74% | 114,123 | Shares | 2026-08-14 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $11,590,068 | 0.63% | 96,600 | Shares | 2026-08-13 | |
| Mega T. Rowe Price Investment Management, Inc. Adviser | $11,152,980 | 0.61% | 92,957 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $10,550,321 | 0.57% | 87,934 | Shares | 2026-08-12 | |
| Mid PERCEPTIVE ADVISORS LLC Registered adviser | $10,415,703 | 0.57% | 86,812 | Shares | 2026-08-14 | |
| Large LORD, ABBETT & CO. LLC Registered adviser | $10,353,434 | 0.56% | 86,293 | Shares | 2026-08-14 | |
| Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Non-US | $9,994,334 | 0.54% | 83,300 | Shares | 2026-08-13 | |
| Large HRT FINANCIAL LP | $9,683,465 | 0.53% | 80,709 | Shares | 2026-08-14 | |
| Mega MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Registered adviser | $9,475,659 | 0.51% | 78,977 | Shares | 2026-08-03 | |
| Mid Greenwich Wealth Management LLC Registered adviser | $8,593,567 | 0.47% | 71,625 | Shares | 2026-08-12 | |
| Small Blue Water Life Science Advisors, LP Registered adviser | $8,398,600 | 0.46% | 70,000 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $7,738,710 | 0.42% | 64,500 | Put | 2026-08-14 | |
| Mega TD Asset Management Inc | $7,616,570 | 0.41% | 63,482 | Shares | 2026-08-04 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $7,083,618 | 0.38% | 59,040 | Shares | 2026-08-14 | |
| Large Verition Fund Management LLC Registered adviser | $6,838,860 | 0.37% | 57,000 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $6,550,667 | 0.36% | 54,598 | Shares | 2026-08-14 | |
| Large Ensign Peak Advisors, Inc | $6,170,211 | 0.33% | 51,427 | Shares | 2026-08-14 | |
| Mid Jump Financial, LLC | $5,555,074 | 0.30% | 46,300 | Shares | 2026-08-13 | |
| Large MARSHALL WACE, LLP Exempt adviser | $5,358,545 | 0.29% | 44,662 | Shares | 2026-08-13 | |
| Small Fox Hill Wealth Management Registered adviser | $5,246,005 | 0.28% | 43,724 | Shares | 2026-08-19 | |
| Mid F/m Investments LLC Registered adviser | $5,231,128 | 0.28% | 43,600 | Shares | 2026-08-05 | |
| Mid Weiss Asset Management LP Registered adviser | $5,165,978 | 0.28% | 43,057 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $5,144,022 | 0.28% | 42,874 | Shares | 2026-08-13 | |
| Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE | $5,002,806 | 0.27% | 41,697 | Shares | 2026-09-09 | |
| Mid REGENTS OF THE UNIVERSITY OF CALIFORNIA Benefit plan | $4,902,742 | 0.27% | 40,863 | Shares | 2026-08-11 | |
| Mega STATE STREET CORP Bank | $4,285,445 | 0.23% | 35,718 | Shares | 2026-09-22 | |
| Large Universal- Beteiligungs- und Servicegesellschaft mbH | $3,903,189 | 0.21% | 32,532 | Shares | 2026-08-06 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $3,620,516 | 0.20% | 30,176 | Shares | 2026-08-14 | |
| Mega Russell Investments Group, Ltd. | $3,488,296 | 0.19% | 29,074 | Shares | 2026-08-06 | |
| Large Trexquant Investment LP Registered adviser | $3,372,037 | 0.18% | 28,105 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $3,251,458 | 0.18% | 27,100 | Call | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $3,192,907 | 0.17% | 26,612 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $3,117,200 | 0.17% | 25,981 | Shares | 2026-08-14 | |
| Mid SEVEN GRAND MANAGERS, LLC Registered adviser | $2,999,500 | 0.16% | 25,000 | Shares | 2026-08-14 | |
| Mega ROYAL BANK OF CANADA Bank | $2,994,939 | 0.16% | 24,962 | Shares | 2026-08-14 | |
| Mid Quantbot Technologies LP Registered adviser | $2,957,626 | 0.16% | 24,651 | Shares | 2026-08-12 | |
| Mid OpenArc Corporate Advisory, LLC Registered adviser | $2,937,350 | 0.16% | 24,482 | Shares | 2026-08-05 | |
| Mega JANE STREET GROUP, LLC | $2,759,540 | 0.15% | 23,000 | Call | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $2,591,568 | 0.14% | 21,600 | Call | 2026-09-02 | |
| Large TUDOR INVESTMENT CORP ET AL Registered adviser | $2,581,609 | 0.14% | 21,517 | Shares | 2026-08-14 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $2,566,492 | 0.14% | 21,391 | Shares | 2026-08-14 | |
| Small One Wealth Advisors, LLC Registered adviser | $2,392,641 | 0.13% | 19,942 | Shares | 2026-08-06 | |
| Mega MORGAN STANLEY Holding company | $2,210,148 | 0.12% | 18,421 | Shares | 2026-08-13 | |
| Mid XTX Topco Ltd | $2,177,876 | 0.12% | 18,152 | Shares | 2026-08-14 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $2,099,410 | 0.11% | 17,498 | Shares | 2026-08-11 | |
| Mega BARCLAYS PLC Bank | $2,093,171 | 0.11% | 17,446 | Shares | 2026-08-14 | |
| Large POLEN CAPITAL MANAGEMENT LLC Registered adviser | $2,036,660 | 0.11% | 16,975 | Shares | 2026-08-04 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $1,818,296 | 0.10% | 15,155 | Shares | 2026-09-02 | |
| Small Scientech Research LLC | $1,738,510 | 0.09% | 14,490 | Shares | 2026-08-14 | |
| Mega DEUTSCHE BANK AG\ Non-US | $1,636,527 | 0.09% | 13,640 | Shares | 2026-08-07 | |
| Large OSAIC HOLDINGS, INC. Holding company | $1,624,048 | 0.09% | 13,536 | Shares | 2026-08-14 | |
| Small SIERRA SUMMIT ADVISORS LLC Registered adviser | $1,429,081 | 0.08% | 11,911 | Shares | 2026-07-20 | |
| Small Caerus Investment Advisors, LLC Registered adviser | $1,374,130 | 0.07% | 11,453 | Shares | 2026-08-14 | |
| Mid Bellevue Group AG Non-US | $1,266,268 | 0.07% | 10,554 | Shares | 2026-08-14 | |
| Mega SEI INVESTMENTS CO | $1,150,488 | 0.06% | 9,589 | Shares | 2026-08-14 | |
| Large Cresset Asset Management, LLC Registered adviser | $1,095,297 | 0.06% | 9,129 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $1,091,818 | 0.06% | 9,100 | Put | 2026-08-14 | |
| Large Squarepoint Ops LLC Registered adviser | $1,052,584 | 0.06% | 8,773 | Shares | 2026-08-14 | |
| Large Vontobel Holding Ltd. | $1,032,468 | 0.06% | 9,700 | Shares | 2026-10-16 | |
| Mid CreativeOne Wealth, LLC Registered adviser | $956,720 | 0.05% | 7,974 | Shares | 2026-08-13 | |
| Large FIFTH THIRD BANCORP Bank | $901,049 | 0.05% | 7,510 | Shares | 2026-08-05 | |
| Large BLAIR WILLIAM & CO/IL Registered adviser | $837,220 | 0.05% | 6,978 | Shares | 2026-08-11 | |
| Mega LPL Financial LLC Broker-dealer | $815,264 | 0.04% | 6,795 | Shares | 2026-08-07 | |
| Mid Entropy Technologies, LP Registered adviser | $803,866 | 0.04% | 6,700 | Shares | 2026-08-13 | |
| Large Steward Partners Investment Advisory, LLC Registered adviser | $777,470 | 0.04% | 6,480 | Shares | 2026-08-13 | |
| Mid GSA CAPITAL PARTNERS LLP Registered adviser | $744,235 | 0.04% | 6,203 | Shares | 2026-08-06 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $743,876 | 0.04% | 6,200 | Put | 2026-09-02 | |
| Mid TWO SIGMA SECURITIES, LLC | $718,920 | 0.04% | 5,992 | Shares | 2026-08-14 | |
| Small BRANDYWINE MANAGERS, LLC Registered adviser | $689,885 | 0.04% | 5,750 | Shares | 2026-08-14 | |
| Mid CERTUITY, LLC Registered adviser | $640,933 | 0.03% | 5,342 | Shares | 2026-07-28 | |
| Mid Jasper Ridge Partners, L.P. Registered adviser | $615,137 | 0.03% | 5,127 | Shares | 2026-08-14 | |
| Small MIC Capital Management UK LLP Registered adviser | $586,942 | 0.03% | 4,892 | Shares | 2026-08-10 |
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