DOSSIER · 13F Holders · Q3 2026

RIOT PLATFORMS INC

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

CUSIP 767292955·7 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$70M
visible holders
Holders
7
filers reporting
Concentration
53.69%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q3 2026

7 institutions reported RIOT PLATFORMS 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
$38M1.9M0.01%Q3 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$17M823K0.01%Q3 2026
03
Optiver Holding B.V.
CIK 0001859606· Market maker
$8M282K0.00%Q2 2026
04
NATIONAL BANK OF CANADA /FI/
CIK 0000926171
$4M2K0.00%Q2 2026
05
GROUP ONE TRADING LLC
CIK 0000932540
$4M133K0.01%Q2 2026
06
HRT FINANCIAL LP
CIK 0001475597
$352K28K0.00%Q4 2025
07
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025