DOSSIER · 13F Holders · Q2 2026

BERKLEY W R CORP

4 institutions still hold BERKLEY W R CORP as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 084423952·4 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$501K
visible holders
Holders
4
filers reporting
Concentration
97.18%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

4 institutions reported BERKLEY W R CORP in Q2 2026. IMC-Chicago, LLC leads at 97.2% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
IMC-Chicago, LLC
CIK 0001452861· Market maker
$487K7K0.00%Q2 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$7K1000.00%Q2 2026
03
GROUP ONE TRADING LLC
CIK 0000932540
$7K1000.00%Q2 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025