DOSSIER · 13F Holders · Q2 2026

MERCK & CO INC

9 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 58933Y955·9 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$276M
visible holders
Holders
9
filers reporting
Concentration
50.64%
JPMORGAN CHASE & CO #1
top holder share
AI Holders Summary · Q2 2026

9 institutions reported MERCK & CO INC in Q2 2026. JPMORGAN CHASE & CO leads at 50.6% 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
$140M1.1M0.01%Q2 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$74M580K0.02%Q2 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$31M238K0.02%Q2 2026
04
GROUP ONE TRADING LLC
CIK 0000932540
$21M162K0.03%Q2 2026
05
HRT FINANCIAL LP
CIK 0001475597
$8M80K0.03%Q4 2025
06
All Terrain Financial Advisors, LLC
CIK 0001731358
$2M12K0.25%Q2 2026
07
Capital Markets Trading UK LLP
CIK 0001719165
$397K3K0.01%Q1 2026
08
Marathon Trading Investment Management LLC
CIK 0001572748
$51K4000.00%Q2 2026
09
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025