MARSH & MCLENNAN COS (MMC) Top Institutional Shareholders
MARSH & MCLENNAN COS (MMC) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $669.77M in MMC holdings during the latest filing period.
Parnassus Endeavor Fund is currently the largest disclosed institutional shareholder of MMC tracked by InsiderSet, reporting ownership valued at approximately $383.40M in its March 31, 2026 SEC Form 13F filing.
The top 10 institutional shareholders tracked on this page collectively account for approximately 100% of the total disclosed MMC value among the investors covered in this analysis. Major shareholders include Parnassus Endeavor Fund, Jensen Investment Management, Renaissance Technologies LLC, and several other long-term asset managers with concentrated positions in MARSH & MCLENNAN COS (MMC).
This page ranks the largest institutional MMC shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Parnassus Endeavor Fund | Parnassus Investments | 1.12% | 2,210,439 | $383,400,645 | — | — | — |
| Jensen Investment Management | Eric H. Schoenstein | 3.94% | 1,151,204 | $199,676,334 | — | — | — |
| Renaissance Technologies LLC | Jim Simons | 0.10% | 365,500 | $63,395,975 | — | — | — |
| Torray Fund | Robert Torray | 2.40% | 94,329 | $16,361,365 | — | — | — |
| Yacktman Asset Management | Donald Yacktman | 0.04% | 19,380 | $3,361,461 | — | — | — |
| Sequoia Financial Advisors | 0.02% | 19,058 | $3,305,552 | — | — | — | |
| Mairs & Power Growth Fund | Andrew R. Adams | 0.00% | 1,300 | $225,485 | — | — | — |
| AKO Capital | Nicolai Tangen | 0.89% | 261,527 | $45,362 | — | — | — |
Frequently asked questions about MMC
Who owns the most MMC stock?
The largest holders of MMC are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for MARSH & MCLENNAN COS (MMC).
Is MMC widely held by superinvestors?
Many widely followed stocks like MMC appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MMC is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.