DOSSIER · 13F Holders · Q3 2026

WILLIAMS COS INC

5 institutions still hold WILLIAMS COS INC as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 969457950·5 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$151M
visible holders
Holders
5
filers reporting
Concentration
53.66%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q3 2026

5 institutions reported WILLIAMS COS INC in Q3 2026. IMC-Chicago, LLC leads at 53.7% 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
$81M1.2M0.02%Q3 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$31M417K0.04%Q2 2026
03
Optiver Holding B.V.
CIK 0001859606· Market maker
$21M279K0.01%Q2 2026
04
SIMPLEX TRADING, LLC
CIK 0001488542
$18M272K0.01%Q3 2026
05
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025