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MRSH in the 13F filings

Marsh & Mclennan Cos Inc · CUSIP 571748102

Sector · InsuranceTheme · Financial services· L3VLUP-defined
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 1 May 2026
Managers listing it
35
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 26 listed it in both
Shares listed
106,386,396
combined, among listed positions
Reported value
$18.5bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 16 buyers (opened or added shares) and 27 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +7,544,086.

Managers listing MRSH in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

35 of 35 holders

ActionFiling
Capital World Investors17,969,182$3.1bn0.43%Added+1,044,05113 May 2026 (the filing on sec.gov)
Wellington Management Group LLP17,370,709$3.0bn0.56%Added+1,372,82915 May 2026 (the filing on sec.gov)
Capital Research Global Investors11,301,188$2.0bn0.30%Added+3,313,39413 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc10,976,286$1.9bn0.22%Added+1,758,40815 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)10,180,705$1.8bn0.09%Trimmed-5,044,73715 May 2026 (the filing on sec.gov)
MFS Investment Management8,200,309$1.4bn0.48%Trimmed-462,14814 May 2026 (the filing on sec.gov)
Harris Associates LP5,169,119$897m1.19%Newnew15 May 2026 (the filing on sec.gov)
Artisan Partners LP4,875,857$846m1.36%Added+1,518,03113 May 2026 (the filing on sec.gov)
Invesco Ltd3,884,778$674m0.07%Added+423,90012 May 2026 (the filing on sec.gov)
AQR Capital Management LLC3,673,987$637m0.29%Added+2,195,96815 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP3,454,586$599m0.32%Added+697,54114 May 2026 (the filing on sec.gov)
AllianceBernstein LP1,981,282$368m0.12%Added+142,05315 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.1,729,550$300m0.18%Trimmed-866,46115 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC1,091,938$189m0.76%Trimmed-624,82815 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC844,067$146m0.21%Added+96,48613 May 2026 (the filing on sec.gov)
Markel Group Inc763,500$132m1.11%Added+1,7501 May 2026 (the filing on sec.gov)
Two Sigma Investments LP676,619$117m0.09%Trimmed-573,29315 May 2026 (the filing on sec.gov)
Marshall Wace LLP605,053$105m0.10%Added+502,61815 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC365,500$63m0.10%Trimmed-32,10014 May 2026 (the filing on sec.gov)
Man Group PLC319,008$55m0.10%Added+248,43415 May 2026 (the filing on sec.gov)
Holocene Advisors LP203,290$35m0.09%Trimmed-1,56815 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd157,363$27munder 0.1%Trimmed-225,63318 May 2026 (the filing on sec.gov)
Citadel Advisors LLC136,487$24munder 0.1%Trimmed-685,88415 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC126,591$22munder 0.1%Added+50,42127 Oct 2026 (the filing on sec.gov)
Millennium Management LLC80,034$14munder 0.1%Trimmed-644,61415 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (1)

Exited (8)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
28 in Q3 2024 to 24 in Q2 2026

Tracked managers listing it, at least.

0102030402014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MRSH by quarter
QuarterHoldersReported valueBuyersSellers
Q2 201315$6.2bnn.a.n.a.
Q3 201312$6.8bnn.a.n.a.
Q4 201313$7.3bnn.a.n.a.
Q1 201417$7.5bnn.a.n.a.
Q2 201411$7.7bnn.a.n.a.
Q3 201417$8.0bnn.a.n.a.
Q4 201419$8.6bnn.a.n.a.
Q1 201517$8.3bnn.a.n.a.
Q2 201520$8.6bnn.a.n.a.
Q3 201521$8.0bnn.a.n.a.
Q4 201519$8.8bnn.a.n.a.
Q1 201619$9.7bnn.a.n.a.
Q2 201616$10.8bnn.a.n.a.
Q3 201620$9.4bnn.a.n.a.
Q4 201627$8.7bnn.a.n.a.
Q1 201724$9.4bnn.a.n.a.
Q2 201723$9.7bnn.a.n.a.
Q3 201717$10.3bnn.a.n.a.
Q4 201721$9.8bnn.a.n.a.
Q1 201819$10.0bnn.a.n.a.
Q2 201816$9.9bnn.a.n.a.
Q3 201816$9.0bnn.a.n.a.
Q4 201821$8.9bnn.a.n.a.
Q1 201923$10.2bnn.a.n.a.
Q2 201923$11.0bnn.a.n.a.
Q3 201918$11.5bnn.a.n.a.
Q4 201920$13.1bnn.a.n.a.
Q1 202023$9.8bnn.a.n.a.
Q2 202020$11.8bnn.a.n.a.
Q3 202021$12.5bnn.a.n.a.
Q4 202025$13.5bnn.a.n.a.
Q1 202123$14.2bnn.a.n.a.
Q2 202125$16.2bnn.a.n.a.
Q3 202126$16.5bnn.a.n.a.
Q4 202127$17.9bnn.a.n.a.
Q1 202226$17.2bnn.a.n.a.
Q2 202225$15.2bnn.a.n.a.
Q3 202228$13.6bnn.a.n.a.
Q4 202227$14.6bnn.a.n.a.
Q1 202330$14.8bnn.a.n.a.
Q2 202327$16.4bnn.a.n.a.
Q3 202327$16.5bnn.a.n.a.
Q4 202321$16.5bn147
Q1 202425$17.8bn1511
Q2 202426$18.3bn179
Q3 202428$19.2bn1514
Q4 202430$18.5bn1712
Q1 202525$22.7bn1016
Q2 202531$21.5bn2110
Q3 202530$19.9bn1712
Q4 202530$18.2bn3014
Q1 202623$18.4bn1627
Q2 202624$17.9bn2318

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

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How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own MRSH, latest filings →Back to the 13F Explorer →