DOSSIER · 13F Holders · Q2 2026

FULCRUM THERAPEUTICS INC

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

CUSIP 359616959·4 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$603K
visible holders
Holders
4
filers reporting
Concentration
55.76%
SIMPLEX TRADING, LLC #1
top holder share
AI Holders Summary · Q2 2026

4 institutions reported FULCRUM THERAPEUTICS INC in Q2 2026. SIMPLEX TRADING, LLC leads at 55.8% 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
$336K92K0.00%Q2 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$154K42K0.00%Q2 2026
03
IMC-Chicago, LLC
CIK 0001452861· Market maker
$113K31K0.00%Q2 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025