13F reference 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 Q3 2026
Institutions Reporting
304
Shares (Excl. Options)
54.97M
Full value: 54,969,072 · shares · 30 Jun 2026Price
$133.26
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.
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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
- 54,969,072
- Total 13F value
- $7,184,731,137
- Portfolio coverage rank
- 0.04%
- Share change
- +3,928,980
- Value change
- +$598,421,308
- Number of holders
- 304
- Shares outstanding
- 85,826,200
- SEC-reported price per share
- $86.22
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
Filing notes and source
Key facts
- ABVX - Abivax S.A. - Ordinary Shares, par value Euro 0.01 per share is tracked under CUSIP 00370M103.
- 304 institutions reported positions in Q2 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 254 to 304 between Q1 2026 and Q2 2026.
- SEC-reported value moved from to
$5.53B
Full value: $5,531,098,968 · USD · 31 Mar 2026.$7.18B
Full value: $7,184,731,137 · USD · 30 Jun 2026
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 304 institutions filings for Q2 2026.
Security key
00370M103
13F reference period
Q2 2026
13F holders
304
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,
304
institutional investors reported holding
shares of
Abivax S.A. - Ordinary Shares, par value Euro 0.01 per share (ABVX).
This represents
64%
of the company’s total
outstanding shares.
54.97M
Full value: 54,969,072 · shares · 30 Jun 202685.83M
Full value: 85,826,200 · shares · Stored outstanding share count13F 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
12
Headline period
Q2 2026
Rows shown
1-12 of 12
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q3 | 4,312,867 | $425,902,604 | +$110,394,956 | $99.02 | 93 |
| 2026 Q2 | 54,969,072 | $7,184,731,137 | +$598,421,308 | $133.26 | 304 |
| 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 |