DOSSIER · 13F Holders · Q2 2026

CYTOKINETICS INC

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

CUSIP 23282W905·5 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$88M
visible holders
Holders
5
filers reporting
Concentration
72.67%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q2 2026

5 institutions reported CYTOKINETICS INC in Q2 2026. GROUP ONE TRADING LLC leads at 72.7% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
GROUP ONE TRADING LLC
CIK 0000932540
$64M752K0.09%Q2 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$13M147K0.00%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$9M100K0.01%Q2 2026
04
JPMORGAN CHASE & CO
CIK 0000019617
$3M35K0.00%Q2 2026
05
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025