13F Insight
DOSSIER · 13F Holders · Q2 2026

MERCK & CO INC

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

CUSIP 58933Y905·10 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$469M
visible holders
Holders
10
filers reporting
Concentration
48.30%
JPMORGAN CHASE & CO #1
top holder share
AI Holders Summary · Q2 2026

10 institutions reported MERCK & CO INC in Q2 2026. JPMORGAN CHASE & CO leads at 48.3% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
JPMORGAN CHASE & CO
CIK 0000019617
$227M1.8M0.01%Q2 202602
IMC-Chicago, LLC
CIK 0001452861· Market maker
$124M961K0.03%Q2 202603
SIMPLEX TRADING, LLC
CIK 0001488542
$49M384K0.03%Q2 202604
GROUP ONE TRADING LLC
CIK 0000932540
$44M345K0.06%Q2 202605
Gladius Capital Management LP
CIK 0001540656
$14M109K0.85%Q2 202606
Maven Securities LTD
CIK 0001633046
$10M75K0.19%Q2 202607
Capital Markets Trading UK LLP
CIK 0001719165
$1M11K0.02%Q1 202608
AlphaCore Capital LLC
CIK 0001713662
$520K1000.01%Q2 202609
Marathon Trading Investment Management LLC
CIK 0001572748
$26K2000.00%Q2 202610
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025