DOSSIER · 13F Holders · Q1 2026Cheap mega-capRe-rated

ABIVAX SA

4 institutions still hold ABIVAX SA as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 00370M903·4 13F holders·last filed Mar 31, 2026

Market cap

—

▲ 7.8%

vs prior quarter

13F value held

$27M

62.0% inst. owned

of float

Holders

4

-128 QoQ

filers reporting

Activity

+93 / −66

+917 added · −876 reduced

this quarter

Concentration

60.53%

IMC-Chicago, LLC #1

top holder share

AI Holders Summary · Q1 2026

4 institutions reported ABIVAX SA in Q1 2026. IMC-Chicago, LLC leads at 60.5% of the visible book. -128 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

Hide index funds / market makers / custodians(1 on this page)

#HolderValueShares% port.Quarter

IMC-Chicago, LLC

CIK 0001452861· Market maker

$16M146K0.01%Q1 2026 02

GROUP ONE TRADING LLC

$9M84K0.02%Q1 2026 03

SABBY MANAGEMENT, LLC

$857,395771.90%Q1 2026 04

SIMPLEX TRADING, LLC

$345,1843K0.00%Q1 2026