13F Insight
DOSSIER · 13F Holders · Q1 2026Financial Services · Insurance Agents, Brokers & ServiceHigh-convictionMulti-bagger
MRSH

MARSH & MCLENNAN COS INC

1,634 institutions still hold MARSH & MCLENNAN COS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 571748102·Insurance Agents, Brokers & Service·1,634 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 5.7%
vs prior quarter
13F value held
$43.7B
75.0% inst. owned
of float
Holders
1,634
-93 QoQ
filers reporting
Activity
+26 / −27
+872 added · −951 reduced
this quarter
Concentration
16.70%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

1,634 institutions reported MRSH in Q1 2026. BlackRock, Inc. leads at 16.7% of the visible book. -93 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$7.3B42.1M0.13%Q1 202602
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$5.5B31.5M0.14%Q1 202603
STATE STREET CORP
CIK 0000093751
$3.8B22.1M0.13%Q1 202604
Capital World Investors
CIK 0001422849
$3.1B18.0M0.43%Q1 202605
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$3.0B17.4M0.56%Q1 202606
Capital International Investors
CIK 0001562230
$2.7B15.7M0.64%Q1 202607
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$2.3B13.4M0.14%Q1 202608
Vanguard Portfolio Management
CIK 0002100121
$2.2B12.4M0.11%Q1 202609
Capital Research Global Investors
CIK 0001422848
$2.0B11.3M0.30%Q1 202610
FMR LLC
CIK 0000315066
$1.8B10.2M0.09%Q1 202611
MASSACHUSETTS FINANCIAL SERVICES CO /MA/
CIK 0000912938
$1.4B8.2M0.48%Q1 202612
MORGAN STANLEY
CIK 0000895421
$1.1B6.5M0.07%Q1 202613
Clearbridge Investments, LLC
CIK 0001348883
$1.1B6.4M0.97%Q1 202614
JPMORGAN CHASE & CO
CIK 0000019617
$1.1B6.1M0.07%Q1 202615
AMERIPRISE FINANCIAL INC
CIK 0000820027
$952M5.5M0.22%Q1 202616
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
CIK 0000861177
$899M5.2M0.19%Q1 202617
HARRIS ASSOCIATES L P
CIK 0000813917
$897M5.2M1.19%Q1 202618
NORTHERN TRUST CORP
CIK 0000073124· Index
$861M5.0M0.11%Q1 202619
BANK OF AMERICA CORP /DE/
CIK 0000070858
$857M4.9M0.06%Q1 202620
Artisan Partners Limited Partnership
CIK 0001466153
$846M4.9M1.36%Q1 2026
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