DOSSIER · 13F Holders · Q3 2026

ORGANON & CO

5 institutions still hold ORGANON & CO as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 68622V956·5 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$16M
visible holders
Holders
5
filers reporting
Concentration
81.49%
WATER ISLAND CAPITAL LLC #1
top holder share
AI Holders Summary · Q3 2026

5 institutions reported ORGANON & CO in Q3 2026. WATER ISLAND CAPITAL LLC leads at 81.5% 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
$13M960K1.30%Q3 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$1M108K0.00%Q3 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$1M94K0.00%Q3 2026
04
GROUP ONE TRADING LLC
CIK 0000932540
$222K16K0.00%Q3 2026
05
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025