Comparable stake leader
TCG Crossover GP I, LLC
SEC ownership of Abivax S.A.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001956827.
Disclosed value leader
TCG Crossover GP I, LLC
Comparable rows
50/50
Latest evidence
02 Jul 2026
- Public ticker
- ABVX on Nasdaq
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
TCG Crossover GP I, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
TCG Crossover GP I, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
02 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001956827
- Issuer location
- Paris
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Abivax S.A. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
TCG Crossover GP I, LLC
Disclosed value leader
TCG Crossover GP I, LLC
Comparable rows
50/50
Latest evidence
02 Jul 2026
13D/G
13F
Lead comparable stake: 7%
13D/G row: TCG Crossover GP I, LLC
Showing 1-8 of 50 holder rows.
Quick read
TCG Crossover GP I, LLC leads the comparable SEC ownership view at 7%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens TCG Crossover GP I, LLC's linked filing trail.
Comparable ownership
Top 5
TCG Crossover GP I, LLC
7%
Invus Global Management, LLC
6%
Deep Track Capital, LP
4.8%
Sofinnova Crossover I
4.3%
Venrock Healthcare Capital Partne...
0.8%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| TCG Crossover GP I, LLC |
13D/G
Chen Yu
|
7%
|
$816,945,267
6,007,834 shares
|
-$150,089,557 | 30 Jun 2026 |
| Invus Global Management, LLC |
13D/G
Raymond Debbane
|
6%
|
$656,206,709
4,825,759 shares
|
+$122,757,849 | 30 Jun 2026 |
| Deep Track Capital, LP |
13D/G
|
4.8%
|
$28,885,195
3,480,144 shares
|
$0 | 30 Jun 2025 |
| Sofinnova Crossover I |
13D/G
Sofinnova Crossover I SLP
|
4.3%
|
$471,190,328
3,535,843 shares
|
-$261,676,160 | 02 Jul 2026 |
| Venrock Healthcare Capital Partners III, L.P. |
13D/G
|
0.8%
|
$48,964,292
576,729 shares
|
$0 | 30 Sep 2025 |
| TCG Crossover Management, LLC |
13F
Company
|
7%
|
$800,603,959
6,007,834 shares
|
— | 30 Jun 2026 |
| Darwin Global Management, Ltd. |
13F
Company
|
4.2%
|
$348,215,205
3,621,583 shares
|
— | 30 Jun 2026 |
| Helikon Investments Ltd |
13F
Company
|
3.2%
|
$371,413,077
2,787,131 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 22 Aug 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Recent insider transactions for Abivax S.A.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.