Who owns BLFS
Which tracked institutional funds hold BLFS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See BLFS company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on BLFS is one-sided between 2026-Q1 and 2026-Q2: 89 added or opened and 14 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
BLFS’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes BLFS more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in BLFS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 202 tracked filers holding BLFS, 132 increased or opened the position and 88 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in BLFS between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 19
- MILLENNIUM MANAGEMENT LLC$18M
- Roubaix Capital, LLC$9M
- JANE STREET GROUP, LLC$5M
- Diamond Hill Capital Management, LLC (Investment Advisor)$4M
- Squarepoint Ops LLC$4M
- ExodusPoint Capital Management, LP$2M
Full exits 9
- T. Rowe Price Investment Management, Inc.$124M
- Curi Capital, LLC$8M
- RENAISSANCE TECHNOLOGIES LLC$4M
- Rathbones Group PLC$1M
- NEW YORK STATE TEACHERS RETIREMENT SYSTEM$1M
- CANADA LIFE ASSURANCE Co$663K
Largest adds
- BlackRock, Inc.$64M
- Invesco Ltd.$21M
- VANGUARD CAPITAL MANAGEMENT LLC$19M
- UBS Group AG$18M
- Casdin Capital, LLC$18M
- STATE STREET CORP$17M
Largest trims
- AMERIPRISE FINANCIAL INC$15M
- PALISADE CAPITAL MANAGEMENT, LP$5M
- D. E. Shaw & Co., Inc.$2M
- Rockefeller Capital Management L.P.$2M
- Summit Creek Advisors LLC$804K
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 6,375,545 | $180M | 15.3% | 2026-Q2 |
| Casdin Capital, LLC trimmed | 4,655,000 | $131M | 11.2% | 2026-Q2 |
| Invesco Ltd. added | 2,240,423 | $63M | 5.4% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,964,084 | $55M | 4.7% | 2026-Q2 |
| STATE STREET CORP added | 1,655,927 | $47M | 4.0% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,086,865 | $31M | 2.6% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 1,079,270 | $30M | 2.6% | 2026-Q2 |
| FRED ALGER MANAGEMENT, LLC trimmed | 1,077,577 | $30M | 2.6% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,046,252 | $30M | 2.5% | 2026-Q2 |
| FMR LLC trimmed | 993,106 | $28M | 2.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 950,159 | $27M | 2.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 913,226 | $26M | 2.2% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 890,908 | $25M | 2.1% | 2026-Q2 |
| UBS Group AG added | 832,143 | $23M | 2.0% | 2026-Q2 |
| Stephens Investment Management Group LLC added | 708,666 | $20M | 1.7% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 625,658 | $18M | 1.5% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 623,875 | $18M | 1.5% | 2026-Q2 |
| GENEVA CAPITAL MANAGEMENT LLC trimmed | 582,141 | $16M | 1.4% | 2026-Q2 |
| CRAMER ROSENTHAL MCGLYNN LLC trimmed | 575,792 | $16M | 1.4% | 2026-Q2 |
| NEXT CENTURY GROWTH INVESTORS LLC added | 558,829 | $16M | 1.3% | 2026-Q2 |
| GAGNON SECURITIES LLC trimmed | 535,906 | $15M | 1.3% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 531,582 | $15M | 1.3% | 2026-Q2 |
| Granahan Investment Management, LLC trimmed | 521,430 | $15M | 1.3% | 2026-Q2 |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC trimmed | 496,511 | $14M | 1.2% | 2026-Q2 |
| NORTHERN TRUST CORP added | 479,777 | $14M | 1.2% | 2026-Q2 |
| MORGAN STANLEY added | 477,504 | $13M | 1.1% | 2026-Q2 |
| Rockefeller Capital Management L.P. trimmed | 445,020 | $13M | 1.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 437,732 | $12M | 1.0% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 402,896 | $11M | 1.0% | 2026-Q2 |
| PALISADE CAPITAL MANAGEMENT, LP trimmed | 352,737 | $10M | 0.8% | 2026-Q2 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 325,382 | $9M | 0.8% | 2026-Q2 |
| Roubaix Capital, LLC new | 309,618 | $9M | 0.7% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 302,318 | $9M | 0.7% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 274,470 | $8M | 0.7% | 2026-Q2 |
| Gagnon Advisors, LLC | 274,217 | $8M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO trimmed | 272,323 | $8M | 0.7% | 2026-Q2 |
| Heights Point Management, LP added | 238,850 | $7M | 0.6% | 2026-Q2 |
| Ranger Investment Management, L.P. trimmed | 238,521 | $7M | 0.6% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 230,227 | $7M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp added | 229,109 | $6M | 0.5% | 2026-Q2 |
| TD Asset Management Inc trimmed | 192,440 | $5M | 0.5% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 191,776 | $5M | 0.5% | 2026-Q2 |
| Uniplan Investment Counsel, Inc. added | 188,330 | $5M | 0.5% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 183,061 | $5M | 0.4% | 2026-Q2 |
| Summit Creek Advisors LLC trimmed | 180,544 | $5M | 0.4% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 161,457 | $5M | 0.4% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 157,944 | $4M | 0.4% | 2026-Q2 |
| Diamond Hill Capital Management, LLC (Investment Advisor) new | 153,887 | $4M | 0.4% | 2026-Q2 |
| Man Group plc added | 145,503 | $4M | 0.3% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 142,680 | $4M | 0.3% | 2026-Q2 |
| ISTHMUS PARTNERS, LLC added | 140,987 | $4M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 135,992 | $4M | 0.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 132,942 | $4M | 0.3% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 132,891 | $4M | 0.3% | 2026-Q2 |
| SEI INVESTMENTS CO added | 126,170 | $4M | 0.3% | 2026-Q2 |
| Conestoga Capital Advisors, LLC added | 121,652 | $3M | 0.3% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 120,580 | $3M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 114,978 | $3M | 0.3% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 107,471 | $3M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 103,975 | $3M | 0.2% | 2026-Q2 |
| Legal & General Group Plc trimmed | 92,631 | $3M | 0.2% | 2026-Q2 |
| BARINGS LLC | 91,316 | $3M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 82,400 | $2M | 0.2% | 2026-Q2 |
| Nuveen, LLC trimmed | 76,695 | $2M | 0.2% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 76,120 | $2M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 75,790 | $2M | 0.2% | 2026-Q2 |
| Hodges Capital Management Inc. new | 73,000 | $2M | 0.2% | 2026-Q2 |
| Verition Fund Management LLC added | 69,324 | $2M | 0.2% | 2026-Q2 |
| ZACKS INVESTMENT MANAGEMENT trimmed | 67,506 | $2M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 66,811 | $2M | 0.2% | 2026-Q2 |
| XTX Topco Ltd added | 63,783 | $2M | 0.2% | 2026-Q2 |
| Numerai GP LLC new | 62,256 | $2M | 0.1% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 61,852 | $2M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 60,792 | $2M | 0.1% | 2026-Q2 |
| Cerity Partners LLC added | 57,506 | $2M | 0.1% | 2026-Q2 |
| Vestmark Advisory Solutions, Inc. added | 55,440 | $2M | 0.1% | 2026-Q2 |
| CenterBook Partners LP new | 53,768 | $2M | 0.1% | 2026-Q2 |
| TIG Advisors, LLC new | 53,611 | $2M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 50,650 | $966K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 45,768 | $1M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 45,713 | $1M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 43,033 | $1M | 0.1% | 2026-Q2 |
| KORNITZER CAPITAL MANAGEMENT INC /KS trimmed | 41,349 | $1M | 0.1% | 2026-Q2 |
| CIBC Bancorp USA Inc. added | 40,090 | $1M | 0.1% | 2026-Q2 |
| Penbrook Management LLC added | 39,705 | $1M | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 39,261 | $1M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 37,445 | $1M | 0.1% | 2026-Q2 |
| FOX RUN MANAGEMENT, L.L.C. added | 36,709 | $1M | 0.1% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 35,019 | $989K | 0.1% | 2026-Q2 |
| D.A. DAVIDSON & CO. added | 33,952 | $959K | 0.1% | 2026-Q2 |
| HARVEST MANAGEMENT LLC new | 32,000 | $904K | 0.1% | 2026-Q2 |
| Tidal Investments LLC new | 29,012 | $819K | 0.1% | 2026-Q2 |
| BARCLAYS PLC trimmed | 27,717 | $783K | 0.1% | 2026-Q2 |
| Vident Advisory, LLC added | 27,362 | $773K | 0.1% | 2026-Q2 |
| Weiss Asset Management LP new | 25,447 | $719K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 24,868 | $702K | 0.1% | 2026-Q2 |
| MARSHALL WACE, LLP new | 23,692 | $669K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 22,859 | $646K | 0.1% | 2026-Q2 |
| Jupiter Topco LLC new | 19,717 | $557K | 0.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 19,655 | $555K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.