Who owns ABVX (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-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
70 tracked funds added or opened ABVX while 112 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
ABVX’s largest tracked holder by dollar value, TCG Crossover Management, LLC, sizes it at 20.6% of its own reported 13F book, while the median holder sizes it at 0.7% of theirs — a 20.0pp 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 2025-Q4 and 2026-Q1, across 252 tracked filers holding ABVX, 162 increased or opened the position and 123 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 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 22
- Helikon Investments Ltd$113M
- Kite Lake Capital Management (UK) LLP$11M
- HRT FINANCIAL LP$10M
- Centiva Capital, LP$6M
- SEVEN GRAND MANAGERS, LLC$6M
- Alberta Investment Management Corp$5M
Full exits 24
- DEUTSCHE BANK AG\$103M
- BVF INC/IL$69M
- Frazier Life Sciences Management, L.P.$51M
- First Light Asset Management, LLC$12M
- SAMLYN CAPITAL, LLC$11M
- Resolute Capital Asset Partners LLC$9M
Largest adds
- Logos Global Management LP$21M
- Eversept Partners, LP$15M
- BANK OF AMERICA CORP /DE/$11M
- WESTFIELD CAPITAL MANAGEMENT CO LP$11M
- IMC-Chicago, LLC$10M
- READYSTATE ASSET MANAGEMENT LP$10M
Largest trims
- Point72 Asset Management, L.P.$254M
- TCG Crossover Management, LLC$237M
- MORGAN STANLEY$235M
- Paradigm Biocapital Advisors LP$105M
- Cormorant Asset Management, LP$97M
- UBS Group AG$90M
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 |
|---|---|---|---|---|
| TCG Crossover Management, LLC trimmed | 6,481,085 | $722M | 12.5% | 2026-Q1 |
| UBS Group AG added | 4,547,406 | $506M | 8.8% | 2026-Q1 |
| Darwin Global Management, Ltd. added | 3,468,657 | $352M | 6.1% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,704,958 | $190M | 3.3% | 2026-Q1 |
| Vestal Point Capital, LP trimmed | 1,500,000 | $167M | 2.9% | 2026-Q1 |
| Caligan Partners LP added | 1,461,924 | $163M | 2.8% | 2026-Q1 |
| ADAR1 Capital Management, LLC added | 1,394,019 | $155M | 2.7% | 2026-Q1 |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 1,322,938 | $147M | 2.6% | 2026-Q1 |
| FMR LLC trimmed | 1,272,827 | $142M | 2.5% | 2026-Q1 |
| Helikon Investments Ltd new | 1,013,324 | $113M | 2.0% | 2026-Q1 |
| Eversept Partners, LP added | 934,423 | $104M | 1.8% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 878,829 | $98M | 1.7% | 2026-Q1 |
| BAKER BROS. ADVISORS LP | 875,796 | $98M | 1.7% | 2026-Q1 |
| LORD, ABBETT & CO. LLC added | 854,920 | $95M | 1.6% | 2026-Q1 |
| Paradigm Biocapital Advisors LP trimmed | 772,473 | $86M | 1.5% | 2026-Q1 |
| Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. added | 765,915 | $85M | 1.5% | 2026-Q1 |
| Cormorant Asset Management, LP trimmed | 760,000 | $85M | 1.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 735,729 | $82M | 1.4% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 691,670 | $77M | 1.3% | 2026-Q1 |
| Octagon Capital Advisors LP trimmed | 677,000 | $75M | 1.3% | 2026-Q1 |
| Logos Global Management LP added | 675,000 | $75M | 1.3% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 637,736 | $71M | 1.2% | 2026-Q1 |
| Ensign Peak Advisors, Inc added | 631,838 | $70M | 1.2% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 605,992 | $67M | 1.2% | 2026-Q1 |
| Artia Global Partners LP | 600,747 | $67M | 1.2% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 635,066 | $64M | 1.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 544,338 | $61M | 1.0% | 2026-Q1 |
| Saturn V Capital Management LP trimmed | 542,696 | $60M | 1.0% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 472,961 | $53M | 0.9% | 2026-Q1 |
| First Turn Management, LLC added | 465,869 | $52M | 0.9% | 2026-Q1 |
| ORBIMED ADVISORS LLC added | 465,700 | $52M | 0.9% | 2026-Q1 |
| Aberdeen Group plc added | 431,241 | $48M | 0.8% | 2026-Q1 |
| BlackRock, Inc. trimmed | 427,335 | $48M | 0.8% | 2026-Q1 |
| Affinity Asset Advisors, LLC trimmed | 405,000 | $45M | 0.8% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 400,539 | $45M | 0.8% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 382,830 | $43M | 0.7% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 381,282 | $42M | 0.7% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 348,797 | $39M | 0.7% | 2026-Q1 |
| PERCEPTIVE ADVISORS LLC trimmed | 328,884 | $37M | 0.6% | 2026-Q1 |
| EVENTIDE ASSET MANAGEMENT, LLC trimmed | 320,576 | $36M | 0.6% | 2026-Q1 |
| STEMPOINT CAPITAL LP trimmed | 313,791 | $35M | 0.6% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 312,274 | $35M | 0.6% | 2026-Q1 |
| SILVERARC CAPITAL MANAGEMENT, LLC trimmed | 302,530 | $34M | 0.6% | 2026-Q1 |
| Holocene Advisors, LP | 258,657 | $29M | 0.5% | 2026-Q1 |
| Vivo Capital, LLC trimmed | 239,539 | $27M | 0.5% | 2026-Q1 |
| Woodline Partners LP | 225,892 | $25M | 0.4% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 213,689 | $24M | 0.4% | 2026-Q1 |
| JENNISON ASSOCIATES LLC added | 210,534 | $23M | 0.4% | 2026-Q1 |
| READYSTATE ASSET MANAGEMENT LP added | 202,022 | $22M | 0.4% | 2026-Q1 |
| Boxer Capital Management, LLC added | 200,000 | $22M | 0.4% | 2026-Q1 |
| Creek Drive Management Group LLC added | 155,000 | $17M | 0.3% | 2026-Q1 |
| Evergreen Quality Fund GP, Ltd. trimmed | 144,300 | $16M | 0.3% | 2026-Q1 |
| ExodusPoint Capital Management, LP trimmed | 140,262 | $16M | 0.3% | 2026-Q1 |
| Hudson Bay Capital Management LP trimmed | 139,379 | $16M | 0.3% | 2026-Q1 |
| Nantahala Capital Management, LLC trimmed | 137,237 | $15M | 0.3% | 2026-Q1 |
| Sio Capital Management, LLC added | 135,800 | $15M | 0.3% | 2026-Q1 |
| Squadron Capital Management LLC trimmed | 130,000 | $14M | 0.3% | 2026-Q1 |
| NAN FUNG TRINITY (HK) LTD added | 128,940 | $14M | 0.2% | 2026-Q1 |
| Apis Capital Advisors, LLC added | 128,800 | $14M | 0.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 122,807 | $14M | 0.2% | 2026-Q1 |
| Patient Square Capital LP trimmed | 121,245 | $14M | 0.2% | 2026-Q1 |
| HighVista Strategies LLC added | 113,254 | $13M | 0.2% | 2026-Q1 |
| TimesSquare Capital Management, LLC trimmed | 109,183 | $12M | 0.2% | 2026-Q1 |
| FEDERATED HERMES, INC. | 108,200 | $12M | 0.2% | 2026-Q1 |
| MPM BIOIMPACT LLC added | 107,268 | $12M | 0.2% | 2026-Q1 |
| IMC-Chicago, LLC added | 106,143 | $12M | 0.2% | 2026-Q1 |
| FINDELL CAPITAL MANAGEMENT LLC added | 105,000 | $12M | 0.2% | 2026-Q1 |
| Prosight Management, LP added | 105,000 | $12M | 0.2% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 101,611 | $11M | 0.2% | 2026-Q1 |
| Pictet Asset Management Holding SA trimmed | 103,545 | $11M | 0.2% | 2026-Q1 |
| Kite Lake Capital Management (UK) LLP new | 100,000 | $11M | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO added | 94,220 | $10M | 0.2% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 94,141 | $10M | 0.2% | 2026-Q1 |
| BARCLAYS PLC trimmed | 90,775 | $10M | 0.2% | 2026-Q1 |
| Nicholas Investment Partners, LP added | 90,206 | $10M | 0.2% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 83,031 | $9M | 0.2% | 2026-Q1 |
| ODDO BHF ASSET MANAGEMENT SAS added | 81,496 | $9M | 0.2% | 2026-Q1 |
| Davern Capital Partners, LP added | 78,125 | $9M | 0.2% | 2026-Q1 |
| ANDERA PARTNERS | 78,125 | $9M | 0.2% | 2026-Q1 |
| Velan Capital Investment Management LP added | 77,000 | $9M | 0.1% | 2026-Q1 |
| LMR Partners LLP trimmed | 76,552 | $9M | 0.1% | 2026-Q1 |
| LPL Financial LLC added | 75,366 | $8M | 0.1% | 2026-Q1 |
| DIADEMA PARTNERS LP added | 75,944 | $8M | 0.1% | 2026-Q1 |
| Voleon Capital Management LP trimmed | 73,726 | $8M | 0.1% | 2026-Q1 |
| ACT CAPITAL MANAGEMENT, LLC added | 70,900 | $8M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ new | 764,899 | $103M | 1.8% | 2025-Q4 stale |
| BVF INC/IL trimmed | 508,031 | $69M | 1.2% | 2025-Q4 stale |
| Fairmount Funds Management LLC new | 713,434 | $61M | 1.0% | 2025-Q3 stale |
| Frazier Life Sciences Management, L.P. | 378,300 | $51M | 0.9% | 2025-Q4 stale |
| VR ADVISER, LLC trimmed | 576,729 | $49M | 0.8% | 2025-Q3 stale |
| RTW INVESTMENTS, LP new | 350,000 | $30M | 0.5% | 2025-Q3 stale |
| Deep Track Capital, LP trimmed | 3,480,144 | $27M | 0.5% | 2025-Q2 stale |
| Bronte Capital Management Pty Ltd. new | 156,747 | $15M | 0.3% | 2025-Q3 stale |
| GREAT POINT PARTNERS LLC trimmed | 150,000 | $13M | 0.2% | 2025-Q3 stale |
| First Light Asset Management, LLC trimmed | 88,674 | $12M | 0.2% | 2025-Q4 stale |
| SAMLYN CAPITAL, LLC new | 84,286 | $11M | 0.2% | 2025-Q4 stale |
| Resolute Capital Asset Partners LLC added | 65,000 | $9M | 0.2% | 2025-Q4 stale |
| MARSHALL WACE, LLP trimmed | 59,758 | $8M | 0.1% | 2025-Q4 stale |
| SummitTX Capital, L.P. added | 56,174 | $8M | 0.1% | 2025-Q4 stale |
| Y-Intercept (Hong Kong) Ltd new | 54,993 | $7M | 0.1% | 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.