DOSSIER · 13F Holders · Q2 2026

WESTERN ALLIANCE BANCORP

6 institutions still hold WESTERN ALLIANCE BANCORP as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 957638909·6 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$29M
visible holders
Holders
6
filers reporting
Concentration
38.61%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

6 institutions reported WESTERN ALLIANCE BANCORP in Q2 2026. IMC-Chicago, LLC leads at 38.6% 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
$11M134K0.00%Q2 2026
02
Optiver Holding B.V.
CIK 0001859606· Market maker
$11M132K0.00%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$4M46K0.00%Q2 2026
04
HRT FINANCIAL LP
CIK 0001475597
$2M30K0.01%Q4 2025
05
GROUP ONE TRADING LLC
CIK 0000932540
$452K6K0.00%Q2 2026
06
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025