53% buyers of institutions opening or closing positions this quarter
7 more new buyers than exits, ownership rose 6.36 percentage points vs the prior quarter, and 2 well-known fund managers in the top 25.
53% buyers of institutions opening or closing positions this quarter
83.0% institutional ownership
TCG Crossover Management, portfolio allocation
Institutional ownership vs Biotechnology peers
No Form 4 insider transactions on file
Latest positioning in ABVX across 13F flow, ownership shift, marquee holders, and holder-count growth.
Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ABVX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | TCG Crossover Management, LLC | 6.5M | $721.7M | -8.9% | 9.885% | 20.65% |
| 2 | UBS Group AG | 4.5M | $506.4M | +2.8% | 6.935% | 0.08% |
| 3 | Darwin Global Management, Ltd. | 3.5M | $352.1M | +9.1% | 5.290% | 9.34% |
| 4 | MORGAN STANLEY | 1.7M | $189.8M | -45.9% | 2.600% | 0.01% |
| 5 | Vestal Point Capital, LP | 1.5M | $167.0M | -21.1% | 2.288% | 4.67% |
| 6 | Caligan Partners LP | 1.5M | $162.8M | +0.7% | 2.230% | 10.83% |
| 7 | ADAR1 Capital Management, LLC | 1.4M | $160.1M | +9.2% | 2.193% | 9.43% |
| 8 | CITADEL ADVISORS LLC | 1.3M | $149.1M | +23.6% | 2.042% | 0.02% |
| 9 | WESTFIELD CAPITAL MANAGEMENT CO LP | 1.3M | $147.3M | +31.0% | 2.018% | 0.62% |
| 10 | FMR LLC | 1.3M | $143.2M | -5.8% | 1.962% | 0.01% |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1.3M | $143.1M | -13.7% | 1.960% | 0.02% |
| 12 | Helikon Investments Ltd | 1.0M | $112.8M | — | 1.546% | 4.26% |
| 13 | Eversept Partners, LP | 934K | $104.0M | +42.0% | 1.425% | 5.49% |
| 14 | JANUS HENDERSON GROUP PLC | 879K | $98.0M | +31.6% | 1.340% | 0.05% |
| 15 | BAKER BROS. ADVISORS LP | 876K | $97.5M | 0.0% | 1.336% | 0.56% |
| 16 | Paradigm Biocapital Advisors LP | 772K | $86.0M | -45.5% | 1.178% | 1.76% |
| 17 | Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. | 766K | $85.3M | +10.7% | 1.168% | 7.23% |
| 18 | Cormorant Asset Management, LP | 760K | $84.6M | -43.7% | 1.159% | 4.25% |
| 19 | BANK OF AMERICA CORP /DE/ | 736K | $81.9M | +40.9% | 1.122% | 0.01% |
| 20 | Octagon Capital Advisors LP | 677K | $75.4M | -10.4% | 1.033% | 8.34% |
| 21 | Logos Global Management LP | 675K | $75.2M | +68.8% | 1.030% | 3.75% |
| 22 | Point72 Asset Management, L.P. | 647K | $72.1M | -77.8% | 0.987% | 0.09% |
| 23 | Ensign Peak Advisors, Inc | 632K | $70.4M | +21.9% | 0.964% | 0.13% |
| 24 | Artia Global Partners LP | 601K | $66.9M | -1.6% | 0.916% | 13.39% |
| 25 | BOOTHBAY FUND MANAGEMENT, LLC | 559K | $62.3M | +3.0% | 0.853% | 0.81% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ABVX — a direct measure of their conviction.
Filings activity in ABVX during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 244 | +3.0% | 83.01% | +6.36 pp | $5.49B | 28% |
| Q4 2025 | 237 | +45% | 76.65% | +33.24 pp | $7.66B | +77% |
| Q3 2025 | 163 | +270% | 43.41% | +41.07 pp | $4.34B | +1756% |
| Q2 2025 | 44 | 4.3% | 2.34% | 0.54 pp | $234M | +23% |
| Q1 2025 | 46 | 6.1% | 2.88% | +0.69 pp | $191M | 13% |
| Q4 2024 | 49 | +20% | 2.19% | 0.94 pp | $219M | 30% |
| Q3 2024 | 41 | +5.1% | 3.13% | 0.59 pp | $313M | 16% |
| Q2 2024 | 39 | — | 3.72% | — | $372M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
No recent Form 4 insider transactions on file for ABVX.
Quick answers to the most common questions about buying ABVX stock.
Based on Q1 2026 13F filings, institutional ownership of Abivax S.A. stands at 83.0%, held across 244 reporting institutions.
TCG Crossover Management, LLC is the largest reported institutional holder of ABVX, with approximately 6,481,085 shares worth $0.72B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of ABVX, including CITADEL ADVISORS LLC, Point72 Asset Management, L.P..
Our composite Smart Money Score for ABVX is 66 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
55 institutions opened new positions in ABVX during Q1 2026, while 48 fully exited. 62 added to existing positions and 127 trimmed.
ABVX institutional ownership rose by 6.36 percentage points quarter-over-quarter, with a net change of +7 holders.
The top 10 institutions account for 49.2% of all reported 13F value in ABVX, and the top 25 account for 73.1%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.