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MRSH · Marsh & Mclennan Companies, Inc.

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Market Cap
$90.67B
Shares
477.21M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 1,499
Total Value: $73,042,148,401
Total Shares: 450,686,663
Showing 1–100 of 1,522 holdings by value · page 1 of 16

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 1,499 13F filers · Δ vs Mar 31, 2026
Top Holder
9.0%
Sep 2023 → Jun 2026 · range 9.0% – 10.7%
−0.6 pts
Top 5
29.3%
Sep 2023 → Jun 2026 · range 29.3% – 33.5%
−0.5 pts
Top 10
44.4%
Sep 2023 → Jun 2026 · range 44.3% – 47.8%
+0.1 pts
HHI
276
Sep 2023 → Jun 2026 · range 276 – 334
Broadly held−7

Quarterly Activity

vs Mar 31, 2026
New
141
Increased
485
Decreased
657
Sold Out
195
Unchanged
216
Holder count: -54
Institutional value: -4.1%
Shares held: +2.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,522
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 62709 CUSIP 571748102 13F (30d) 1008 filings 973 filers Visit website Investor relations