Who owns BBIO (BBIO)
Which tracked institutional funds hold BBIO, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See BBIO company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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
133 tracked funds added or opened BBIO while 132 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
BBIO’s largest tracked holder by dollar value, VANGUARD GROUP INC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes BBIO more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in BBIO 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 2025-Q4 and 2026-Q1, across 460 tracked filers holding BBIO, 272 increased or opened the position and 199 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 BBIO between the 2025-Q4 and 2026-Q1 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 37
- VANGUARD PORTFOLIO MANAGEMENT LLC$600M
- VANGUARD CAPITAL MANAGEMENT LLC$576M
- VANGUARD FIDUCIARY TRUST CO$87M
- Catalio Capital Management, LP$32M
- RENAISSANCE TECHNOLOGIES LLC$27M
- Fiera Capital Corp$24M
Full exits 36
- VANGUARD GROUP INC$1.3B
- TWO SIGMA ADVISERS, LP$107M
- Paradigm Biocapital Advisors LP$52M
- Skandinaviska Enskilda Banken AB (publ)$18M
- Philosophy Capital Management LLC$15M
- ExodusPoint Capital Management, LP$10M
Largest adds
- CITADEL ADVISORS LLC$182M
- JANUS HENDERSON GROUP PLC$137M
- JANE STREET GROUP, LLC$104M
- Polar Capital Holdings Plc$88M
- TWO SIGMA INVESTMENTS, LP$83M
- MILLENNIUM MANAGEMENT LLC$44M
Largest trims
- BlackRock, Inc.$232M
- VIKING GLOBAL INVESTORS LP$222M
- Capital Research Global Investors$91M
- NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$87M
- NORGES BANK$74M
- Invesco Ltd.$46M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Kohlberg Kravis Roberts & Co. L.P. | 13,260,971 | $985M | 6.6% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 13,179,013 | $979M | 6.6% | 2026-Q1 |
| BlackRock, Inc. trimmed | 11,863,117 | $881M | 5.9% | 2026-Q1 |
| VIKING GLOBAL INVESTORS LP trimmed | 11,842,434 | $879M | 5.9% | 2026-Q1 |
| FARALLON CAPITAL MANAGEMENT LLC added | 9,365,463 | $695M | 4.7% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 8,080,573 | $600M | 4.0% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 7,759,495 | $576M | 3.9% | 2026-Q1 |
| Aisling Capital Management LP | 5,089,611 | $378M | 2.5% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 4,918,030 | $372M | 2.5% | 2026-Q1 |
| STATE STREET CORP trimmed | 4,934,320 | $366M | 2.5% | 2026-Q1 |
| Invesco Ltd. trimmed | 4,353,030 | $323M | 2.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 3,801,655 | $282M | 1.9% | 2026-Q1 |
| Frazier Life Sciences Management, L.P. trimmed | 3,448,139 | $256M | 1.7% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 3,173,940 | $236M | 1.6% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 3,120,631 | $232M | 1.6% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 2,545,486 | $189M | 1.3% | 2026-Q1 |
| Polar Capital Holdings Plc added | 2,519,306 | $187M | 1.3% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 2,471,948 | $184M | 1.2% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 2,438,925 | $181M | 1.2% | 2026-Q1 |
| FMR LLC trimmed | 2,335,835 | $173M | 1.2% | 2026-Q1 |
| UBS Group AG added | 2,026,821 | $151M | 1.0% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 1,977,080 | $147M | 1.0% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,976,094 | $147M | 1.0% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 1,908,907 | $146M | 1.0% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,897,716 | $141M | 0.9% | 2026-Q1 |
| MORGAN STANLEY added | 1,877,359 | $139M | 0.9% | 2026-Q1 |
| SC US (TTGP), LTD. | 1,860,364 | $138M | 0.9% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 1,757,672 | $131M | 0.9% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 1,534,736 | $114M | 0.8% | 2026-Q1 |
| NORTHERN TRUST CORP added | 1,403,642 | $104M | 0.7% | 2026-Q1 |
| Pictet Asset Management Holding SA added | 1,381,184 | $101M | 0.7% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 1,330,415 | $99M | 0.7% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 1,307,176 | $97M | 0.7% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,285,748 | $95M | 0.6% | 2026-Q1 |
| Hood River Capital Management LLC added | 1,265,080 | $94M | 0.6% | 2026-Q1 |
| Laurion Capital Management LP trimmed | 1,262,651 | $94M | 0.6% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 1,248,521 | $93M | 0.6% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 1,312,259 | $91M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,175,135 | $87M | 0.6% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 1,146,671 | $85M | 0.6% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 1,090,326 | $81M | 0.5% | 2026-Q1 |
| LORD, ABBETT & CO. LLC added | 1,023,341 | $76M | 0.5% | 2026-Q1 |
| GW&K Investment Management, LLC added | 962,643 | $71M | 0.5% | 2026-Q1 |
| FRONTIER CAPITAL MANAGEMENT CO LLC added | 957,989 | $71M | 0.5% | 2026-Q1 |
| Clearbridge Investments, LLC added | 951,200 | $71M | 0.5% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC trimmed | 889,356 | $66M | 0.4% | 2026-Q1 |
| Cormorant Asset Management, LP trimmed | 850,000 | $63M | 0.4% | 2026-Q1 |
| Deep Track Capital, LP added | 841,445 | $62M | 0.4% | 2026-Q1 |
| Ensign Peak Advisors, Inc trimmed | 836,552 | $62M | 0.4% | 2026-Q1 |
| Capital Research Global Investors trimmed | 763,702 | $57M | 0.4% | 2026-Q1 |
| CITIGROUP INC added | 746,483 | $55M | 0.4% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC added | 742,117 | $55M | 0.4% | 2026-Q1 |
| First Turn Management, LLC added | 695,718 | $52M | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 633,283 | $47M | 0.3% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 599,000 | $44M | 0.3% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 588,434 | $44M | 0.3% | 2026-Q1 |
| NORGES BANK trimmed | 1,244,955 | $43M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 577,283 | $43M | 0.3% | 2026-Q1 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 569,180 | $42M | 0.3% | 2026-Q1 |
| Nuveen, LLC added | 562,696 | $42M | 0.3% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 561,945 | $42M | 0.3% | 2026-Q1 |
| Squarepoint Ops LLC added | 556,324 | $41M | 0.3% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 538,980 | $40M | 0.3% | 2026-Q1 |
| EMERALD ADVISERS, LLC trimmed | 515,361 | $38M | 0.3% | 2026-Q1 |
| EVENTIDE ASSET MANAGEMENT, LLC added | 437,130 | $32M | 0.2% | 2026-Q1 |
| Catalio Capital Management, LP trimmed | 432,014 | $32M | 0.2% | 2026-Q1 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 426,583 | $32M | 0.2% | 2026-Q1 |
| BARCLAYS PLC trimmed | 423,888 | $31M | 0.2% | 2026-Q1 |
| GILDER GAGNON HOWE & CO LLC trimmed | 420,325 | $31M | 0.2% | 2026-Q1 |
| Sofinnova Investments, Inc. trimmed | 409,183 | $30M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 402,948 | $30M | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 398,943 | $30M | 0.2% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 365,772 | $27M | 0.2% | 2026-Q1 |
| 1832 Asset Management L.P. added | 356,400 | $26M | 0.2% | 2026-Q1 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC trimmed | 352,831 | $26M | 0.2% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 351,719 | $26M | 0.2% | 2026-Q1 |
| Fisher Asset Management, LLC added | 351,628 | $26M | 0.2% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 350,096 | $26M | 0.2% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 339,907 | $25M | 0.2% | 2026-Q1 |
| MARSHALL WACE, LLP added | 334,382 | $25M | 0.2% | 2026-Q1 |
| Fiera Capital Corp new | 322,690 | $24M | 0.2% | 2026-Q1 |
| EMERALD MUTUAL FUND ADVISERS TRUST added | 320,211 | $24M | 0.2% | 2026-Q1 |
| NOMURA HOLDINGS INC added | 318,563 | $24M | 0.2% | 2026-Q1 |
| Woodline Partners LP added | 301,012 | $22M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 311,959 | $22M | 0.1% | 2026-Q1 |
| Nicholas Investment Partners, LP added | 298,909 | $22M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 296,683 | $22M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 288,075 | $21M | 0.1% | 2026-Q1 |
| Swiss National Bank added | 286,000 | $21M | 0.1% | 2026-Q1 |
| Legal & General Group Plc trimmed | 284,917 | $21M | 0.1% | 2026-Q1 |
| ALGERT GLOBAL LLC trimmed | 283,921 | $21M | 0.1% | 2026-Q1 |
| Candriam S.C.A. | 278,888 | $21M | 0.1% | 2026-Q1 |
| Integral Health Asset Management, LLC added | 275,000 | $20M | 0.1% | 2026-Q1 |
| Eagle Health Investments LP added | 267,031 | $20M | 0.1% | 2026-Q1 |
| Bridgewater Associates, LP added | 259,459 | $19M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 16,628,102 | $1.3B | 8.5% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP trimmed | 1,401,035 | $107M | 0.7% | 2025-Q4 stale |
| MACQUARIE GROUP LTD trimmed | 1,933,096 | $100M | 0.7% | 2025-Q3 stale |
| T. Rowe Price Investment Management, Inc. added | 1,051,679 | $55M | 0.4% | 2025-Q3 stale |
| Paradigm Biocapital Advisors LP | 684,277 | $52M | 0.4% | 2025-Q4 stale |
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.