DOSSIER · 13F Holders · Q2 2026

RIOT PLATFORMS INC

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

CUSIP 767292905·6 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$121M
visible holders
Holders
6
filers reporting
Concentration
51.78%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

6 institutions reported RIOT PLATFORMS INC in Q2 2026. IMC-Chicago, LLC leads at 51.8% 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
$63M2.3M0.01%Q2 2026
02
Optiver Holding B.V.
CIK 0001859606· Market maker
$23M848K0.01%Q2 2026
03
GROUP ONE TRADING LLC
CIK 0000932540
$18M671K0.03%Q2 2026
04
SIMPLEX TRADING, LLC
CIK 0001488542
$17M616K0.01%Q2 2026
05
Timothy G. Youngquist 2020 Irrevocable Trust
CIK 0002109159
$47K14K0.01%Q2 2026
06
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025