DOSSIER · 13F Holders · Q2 2026

ORGANON & CO

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

CUSIP 68622V956·5 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$17M
visible holders
Holders
5
filers reporting
Concentration
77.88%
WATER ISLAND CAPITAL LLC #1
top holder share
AI Holders Summary · Q2 2026

5 institutions reported ORGANON & CO in Q2 2026. WATER ISLAND CAPITAL LLC leads at 77.9% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
WATER ISLAND CAPITAL LLC
CIK 0001222765
$13M974K1.23%Q2 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$2M146K0.00%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$1M102K0.00%Q2 2026
04
GROUP ONE TRADING LLC
CIK 0000932540
$391K29K0.00%Q2 2026
05
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025