Who owns ABVX
Which tracked institutional funds hold ABVX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ABVX company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-02). 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
137 tracked funds added or opened ABVX while 70 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
ABVX’s largest tracked holder by dollar value, TCG Crossover Management, LLC, sizes it at 19.2% of its own reported 13F book, while the median holder sizes it at 0.7% of theirs — a 18.6pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ABVX 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 290 tracked filers holding ABVX, 181 increased or opened the position and 148 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 ABVX 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 46
- Jupiter Topco LLC$255M
- RA CAPITAL MANAGEMENT, L.P.$151M
- NORGES BANK$147M
- Siren, L.L.C.$77M
- SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC$55M
- Melqart Asset Management (UK) Ltd$41M
Full exits 32
- JANUS HENDERSON GROUP PLC$98M
- BAKER BROS. ADVISORS LP$98M
- LORD, ABBETT & CO. LLC$95M
- Paradigm Biocapital Advisors LP$86M
- Evergreen Quality Fund GP, Ltd.$16M
- Hudson Bay Capital Management LP$16M
Largest adds
- Helikon Investments Ltd$259M
- Vestal Point Capital, LP$146M
- CITADEL ADVISORS LLC$131M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$98M
- ADAR1 Capital Management, LLC$85M
- TCG Crossover Management, LLC$79M
Largest trims
- UBS Group AG$260M
- FMR LLC$116M
- Point72 Asset Management, L.P.$70M
- JPMORGAN CHASE & CO$64M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$41M
- PRICE T ROWE ASSOCIATES INC /MD/$37M
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 |
|---|---|---|---|---|
| TCG Crossover Management, LLC trimmed | 6,007,834 | $801M | 11.6% | 2026-Q2 |
| Darwin Global Management, Ltd. added | 3,621,583 | $348M | 5.0% | 2026-Q2 |
| Helikon Investments Ltd added | 2,787,131 | $371M | 5.4% | 2026-Q2 |
| Vestal Point Capital, LP added | 2,349,443 | $313M | 4.5% | 2026-Q2 |
| Jupiter Topco LLC new | 1,913,933 | $255M | 3.7% | 2026-Q2 |
| UBS Group AG trimmed | 1,844,918 | $246M | 3.6% | 2026-Q2 |
| ADAR1 Capital Management, LLC added | 1,804,703 | $240M | 3.5% | 2026-Q2 |
| Caligan Partners LP added | 1,557,924 | $208M | 3.0% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 1,438,352 | $192M | 2.8% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,432,185 | $191M | 2.8% | 2026-Q2 |
| WESTFIELD CAPITAL MANAGEMENT CO LP trimmed | 1,309,825 | $175M | 2.5% | 2026-Q2 |
| RA CAPITAL MANAGEMENT, L.P. new | 1,132,557 | $151M | 2.2% | 2026-Q2 |
| NORGES BANK new | 1,100,000 | $147M | 2.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 1,053,896 | $140M | 2.0% | 2026-Q2 |
| Logos Global Management LP added | 1,024,000 | $136M | 2.0% | 2026-Q2 |
| Octagon Capital Advisors LP added | 993,000 | $132M | 1.9% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 971,439 | $129M | 1.9% | 2026-Q2 |
| Eversept Partners, LP trimmed | 913,880 | $122M | 1.8% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 792,712 | $106M | 1.5% | 2026-Q2 |
| Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. trimmed | 765,332 | $102M | 1.5% | 2026-Q2 |
| Cormorant Asset Management, LP trimmed | 675,000 | $90M | 1.3% | 2026-Q2 |
| Boxer Capital Management, LLC added | 605,000 | $81M | 1.2% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 603,840 | $80M | 1.2% | 2026-Q2 |
| Siren, L.L.C. new | 576,000 | $77M | 1.1% | 2026-Q2 |
| BlackRock, Inc. added | 574,061 | $76M | 1.1% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 563,367 | $75M | 1.1% | 2026-Q2 |
| ORBIMED ADVISORS LLC added | 546,522 | $73M | 1.1% | 2026-Q2 |
| Aberdeen Group plc added | 522,025 | $70M | 1.0% | 2026-Q2 |
| Saturn V Capital Management LP trimmed | 518,865 | $69M | 1.0% | 2026-Q2 |
| Artia Global Partners LP trimmed | 516,447 | $69M | 1.0% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 504,471 | $67M | 1.0% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 492,068 | $66M | 1.0% | 2026-Q2 |
| First Turn Management, LLC added | 489,889 | $65M | 0.9% | 2026-Q2 |
| Holocene Advisors, LP added | 418,657 | $56M | 0.8% | 2026-Q2 |
| Vivo Capital, LLC added | 414,899 | $55M | 0.8% | 2026-Q2 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC new | 410,000 | $55M | 0.8% | 2026-Q2 |
| EVENTIDE ASSET MANAGEMENT, LLC added | 394,957 | $53M | 0.8% | 2026-Q2 |
| MPM BIOIMPACT LLC added | 336,347 | $45M | 0.6% | 2026-Q2 |
| Affinity Asset Advisors, LLC trimmed | 330,000 | $44M | 0.6% | 2026-Q2 |
| Ikarian Capital, LLC added | 328,635 | $43M | 0.6% | 2026-Q2 |
| Melqart Asset Management (UK) Ltd added | 307,250 | $41M | 0.6% | 2026-Q2 |
| Kite Lake Capital Management (UK) LLP added | 300,600 | $40M | 0.6% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 300,365 | $40M | 0.6% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 299,754 | $40M | 0.6% | 2026-Q2 |
| STEMPOINT CAPITAL LP trimmed | 283,657 | $38M | 0.5% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 257,678 | $34M | 0.5% | 2026-Q2 |
| Two Seas Capital LP new | 244,590 | $33M | 0.5% | 2026-Q2 |
| READYSTATE ASSET MANAGEMENT LP added | 241,530 | $32M | 0.5% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 233,740 | $31M | 0.5% | 2026-Q2 |
| Woodline Partners LP added | 226,966 | $30M | 0.4% | 2026-Q2 |
| Patient Square Capital LP added | 206,500 | $28M | 0.4% | 2026-Q2 |
| GREAT POINT PARTNERS LLC added | 204,314 | $27M | 0.4% | 2026-Q2 |
| Western Standard LLC new | 200,000 | $27M | 0.4% | 2026-Q2 |
| JENNISON ASSOCIATES LLC trimmed | 196,524 | $26M | 0.4% | 2026-Q2 |
| FMR LLC trimmed | 191,689 | $26M | 0.4% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 187,335 | $25M | 0.4% | 2026-Q2 |
| FINDELL CAPITAL MANAGEMENT LLC added | 185,000 | $25M | 0.4% | 2026-Q2 |
| SILVERARC CAPITAL MANAGEMENT, LLC trimmed | 169,593 | $23M | 0.3% | 2026-Q2 |
| DIADEMA PARTNERS LP added | 163,644 | $22M | 0.3% | 2026-Q2 |
| Focus Partners Wealth new | 161,874 | $22M | 0.3% | 2026-Q2 |
| Creek Drive Management Group LLC added | 157,500 | $21M | 0.3% | 2026-Q2 |
| NAN FUNG TRINITY (HK) LTD added | 142,083 | $19M | 0.3% | 2026-Q2 |
| Nantahala Capital Management, LLC trimmed | 133,759 | $18M | 0.3% | 2026-Q2 |
| APEIRON CAPITAL Ltd new | 130,600 | $17M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 129,816 | $17M | 0.3% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP new | 123,289 | $16M | 0.2% | 2026-Q2 |
| DG Capital Management, LLC new | 122,267 | $16M | 0.2% | 2026-Q2 |
| FARALLON CAPITAL MANAGEMENT, L.L.C. added | 122,000 | $16M | 0.2% | 2026-Q2 |
| HighVista Strategies LLC trimmed | 113,031 | $15M | 0.2% | 2026-Q2 |
| Seven Fleet Capital Management LP added | 111,334 | $15M | 0.2% | 2026-Q2 |
| Erste Asset Management GmbH added | 110,000 | $11M | 0.2% | 2026-Q2 |
| Prosight Management, LP added | 107,394 | $14M | 0.2% | 2026-Q2 |
| Verition Fund Management LLC added | 105,791 | $14M | 0.2% | 2026-Q2 |
| TimesSquare Capital Management, LLC trimmed | 101,092 | $13M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 98,077 | $13M | 0.2% | 2026-Q2 |
| ACT CAPITAL MANAGEMENT, LLC added | 97,000 | $13M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 92,176 | $12M | 0.2% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 90,357 | $12M | 0.2% | 2026-Q2 |
| SEVEN GRAND MANAGERS, LLC added | 90,000 | $12M | 0.2% | 2026-Q2 |
| TORONTO DOMINION BANK new | 88,331 | $12M | 0.2% | 2026-Q2 |
| IMC-Chicago, LLC trimmed | 87,392 | $12M | 0.2% | 2026-Q2 |
| ODDO BHF ASSET MANAGEMENT SAS | 81,496 | $11M | 0.2% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 81,216 | $11M | 0.2% | 2026-Q2 |
| LPL Financial LLC added | 78,999 | $11M | 0.2% | 2026-Q2 |
| ANDERA PARTNERS | 78,125 | $10M | 0.2% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 77,900 | $10M | 0.2% | 2026-Q2 |
| Optiver Holding B.V. added | 76,368 | $10M | 0.1% | 2026-Q2 |
| PERCEPTIVE ADVISORS LLC trimmed | 74,000 | $10M | 0.1% | 2026-Q2 |
| Apis Capital Advisors, LLC trimmed | 74,000 | $10M | 0.1% | 2026-Q2 |
| Quinn Opportunity Partners LLC added | 66,045 | $9M | 0.1% | 2026-Q2 |
| Velan Capital Investment Management LP trimmed | 65,630 | $9M | 0.1% | 2026-Q2 |
| SummitTX Capital, L.P. added | 65,216 | $9M | 0.1% | 2026-Q2 |
| Alberta Investment Management Corp added | 65,000 | $9M | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 63,354 | $8M | 0.1% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 60,195 | $8M | 0.1% | 2026-Q2 |
| Atle Fund Management AB added | 58,170 | $8M | 0.1% | 2026-Q2 |
| SAMSARA BIOCAPITAL, LLC trimmed | 55,095 | $7M | 0.1% | 2026-Q2 |
| Senator Investment Group LP new | 55,000 | $7M | 0.1% | 2026-Q2 |
| Diametric Capital, LP added | 51,903 | $7M | 0.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 51,868 | $7M | 0.1% | 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.