Marsh & McLennan Companies, Inc (MMC): Institutional Ownership & 13F Holders
Report period: March 31, 2026
1,531 institutional managers report holdings in Marsh & McLennan Companies, Inc (MMC) on SEC Form 13F. Top 30 holders own 295,717,668 shares worth approximately $49.40B at report date.
The largest reported 13F holders of MMC are BlackRock, Inc., VANGUARD CAPITAL MANAGEMENT LLC, STATE STREET CORP, Capital World Investors and WELLINGTON MANAGEMENT GROUP LLP.
Frequently asked questions
Who owns MMC?
Institutional ownership of MMC is disclosed quarterly through SEC Form 13F filings. The most recent report covers the period ending March 31, 2026 with 1,531 institutional holders.
What is a 13F filing?
Form 13F is a quarterly SEC filing required from institutional investment managers overseeing over $100 million in qualifying securities. It discloses their U.S. equity holdings as of the end of each calendar quarter.
How current is 13F data for MMC?
13F filings lag by up to 45 days after quarter end, so positions shown here reflect holdings as of 2026-03-31. Current positions may have changed.
Is institutional ownership of MMC increasing or decreasing?
Over the last 16 reported quarters, the number of 13F institutional holders of MMC went from 5 to 1,520 (increased to 1,520 as of March 31, 2026).