DOSSIER · 13F Holders · Q3 2026

RADNET INC

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

CUSIP 750491952·3 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$1M
visible holders
Holders
3
filers reporting
Concentration
71.76%
SIMPLEX TRADING, LLC #1
top holder share
AI Holders Summary · Q3 2026

3 institutions reported RADNET INC in Q3 2026. SIMPLEX TRADING, LLC leads at 71.8% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
SIMPLEX TRADING, LLC
CIK 0001488542
$841K12K0.00%Q3 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$331K5K0.00%Q3 2026
03
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025