Latest Period
Q2 2026
Security Snapshot
Abivax S.A. - Ordinary Shares, par value Euro 0.01 per share (ABVX) Institutional Ownership
CUSIP: 00370M103
13F Institutional Holders and Ownership History from Q4 2023 to Q2 2026
Institutions Reporting
300
Shares (Excl. Options)
54,930,976
Price
$133.26
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- Security type / class
- Equity / Ordinary Shares, par value Euro 0.01 per share
- Symbol
- ABVX on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 54,930,976
- Total 13F value
- $7,179,571,206
- Portfolio coverage rank
- 0.04%
- Share change
- +3,891,584
- Value change
- +$593,532,130
- Number of holders
- 300
- Shares outstanding
- 85,826,200
- SEC-reported price per share
- $124.33
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
2 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ABVX - Abivax S.A. - Ordinary Shares, par value Euro 0.01 per share is tracked under CUSIP 00370M103.
- 300 institutions reported positions in Q2 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 254 to 300 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $5,531,098,968 to $7,179,571,206.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 300 institutions filings for Q2 2026.
Security key
00370M103
Latest holder period
Q2 2026
13F holders
300
13D/G owners
5
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 00370M103:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
ABVX
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| TCG Crossover GP I, LLC | 7% | -23% | $816,945,267 | -$150,089,557 | 6,007,834 | -16% | Chen Yu | 30 Jun 2026 |
| Invus Global Management, LLC | 6% | +20% | $656,206,709 | +$122,757,849 | 4,825,759 | +23% | Raymond Debbane | 30 Jun 2026 |
| Sofinnova Crossover I | 4.3% | -34% | $471,190,328 | -$261,676,160 | 3,535,843 | -36% | Sofinnova Crossover I SLP | 02 Jul 2026 |
| Deep Track Capital, LP | 4.8% | $28,885,195 | 3,480,144 | Deep Track Capital, LP | 30 Jun 2025 | |||
| Venrock Healthcare Capital Partners III, L.P. | 0.8% | $48,964,292 | 576,729 | Venrock Healthcare Capital Partners III, L.P. | 30 Sep 2025 |
As of 30 Jun 2026, 300 institutional investors reported holding 54,930,976 shares of Abivax S.A. - Ordinary Shares, par value Euro 0.01 per share (ABVX). This represents 64% of the company’s total 85,826,200 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
44%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| TCG Crossover Management, LLC | 7% | 6,007,834 | -7.3% | 19% | $800,603,959 |
| Darwin Global Management, Ltd. | 4.2% | 3,621,583 | +4.4% | 9.3% | $348,215,205 |
| Helikon Investments Ltd | 3.2% | 2,787,131 | +175% | 11% | $371,413,077 |
| Vestal Point Capital, LP | 2.7% | 2,349,443 | +57% | 7.3% | $313,086,774 |
| Jupiter Topco LLC | 2.2% | 1,913,933 | 0% | 0.1% | $255,132,750 |
| UBS Group AG | 2.1% | 1,844,918 | -59% | 0.04% | $245,853,773 |
| ADAR1 Capital Management, LLC | 2.1% | 1,804,703 | +29% | 11% | $240,494,722 |
| Caligan Partners LP | 1.8% | 1,557,924 | +6.6% | 10% | $207,608,952 |
| CITADEL ADVISORS LLC | 1.7% | 1,438,352 | +164% | 0.11% | $191,674,788 |
| MORGAN STANLEY | 1.7% | 1,432,185 | -16% | 0.01% | $190,852,973 |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 1.5% | 1,309,825 | -0.99% | 0.57% | $174,547,280 |
| RA CAPITAL MANAGEMENT, L.P. | 1.3% | 1,132,557 | 1.3% | $150,924,546 | |
| NORGES BANK | 1.3% | 1,100,000 | 0.01% | $146,586,000 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1.2% | 1,053,896 | +176% | 0.12% | $140,442,181 |
| Logos Global Management LP | 1.2% | 1,024,000 | +52% | 5.9% | $136,458,240 |
| Octagon Capital Advisors LP | 1.2% | 993,000 | +47% | 12% | $132,327,180 |
| BANK OF AMERICA CORP /DE/ | 1.1% | 971,439 | +32% | 0.01% | $129,453,961 |
| Eversept Partners, LP | 1.1% | 913,880 | -2.2% | 6.6% | $121,783,649 |
| GOLDMAN SACHS GROUP INC | 0.92% | 792,712 | +127% | 0.01% | $105,636,801 |
| Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. | 0.89% | 765,332 | -0.08% | 5.6% | $101,988,142 |
| Cormorant Asset Management, LP | 0.79% | 675,000 | -11% | 4.6% | $89,950,500 |
| Boxer Capital Management, LLC | 0.7% | 605,000 | +202% | 6.1% | $80,622,300 |
| Balyasny Asset Management L.P. | 0.7% | 603,840 | +183% | 0.15% | $80,467,718 |
| Siren, L.L.C. | 0.67% | 576,000 | 1.6% | $76,757,760 | |
| BlackRock, Inc. | 0.67% | 574,061 | +34% | 0% | $76,499,369 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
11
Latest
Q2 2026
Rows shown
1-11 of 11
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 54,930,976 | $7,179,571,206 | +$593,532,130 | $133.26 | 300 |
| 2026 Q1 | 50,037,731 | $5,531,098,968 | -$766,727,516 | $111.35 | 254 |
| 2025 Q4 | 56,312,422 | $7,607,004,075 | +$630,821,272 | $134.86 | 247 |
| 2025 Q3 | 51,964,814 | $4,408,157,076 | +$2,126,922,733 | $84.90 | 165 |
| 2025 Q2 | 30,664,346 | $234,581,803 | -$5,694,979 | $7.65 | 43 |
| 2025 Q1 | 31,761,546 | $198,509,815 | +$9,164,590 | $6.25 | 46 |
| 2024 Q4 | 29,861,029 | $218,582,712 | +$7,328,424 | $7.32 | 47 |
| 2024 Q3 | 27,383,884 | $312,847,988 | -$8,252,199 | $11.52 | 40 |
| 2024 Q2 | 28,098,910 | $371,643,391 | +$62,450,093 | $13.22 | 38 |
| 2024 Q1 | 23,372,028 | $334,151,423 | +$31,771,567 | $14.30 | 36 |
| 2023 Q4 | 21,265,859 | $227,821,381 | +$227,821,381 | $10.70 | 30 |