Marsh & McLennan Companies, Inc.
DE ˙ DB ˙ US5717481023
135,70 € ↓ -3,10 (-2,23%)
2026-06-03
DEL PRIS
SecurityDE:MSN / Marsh & McLennan Companies, Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership365,500 shares
Latest Disclosed Value $ 63,395,975
Renaissance Technologies Llc reports 8.07% decrease in ownership of MSN / Marsh & McLennan Companies, Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 365,500 shares of Marsh & McLennan Companies, Inc. (DE:MSN) valued at $54,697,075 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 397,600 shares of Marsh & McLennan Companies, Inc.. This represents a change in shares of -8.07% during the quarter. The current value of the position is $49,598,350 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F MARSH & MCLENNAN COS COM 571748102 365,500 -32,100 -8.07 63,396 -14.05 0.0992
2026-02-12 2025-12-31 13F MARSH & MCLENNAN COS COM 571748102 397,600 -722,700 -64.51 73,763 -67.33 0.1144
2025-11-13 2025-09-30 13F MARSH & MCLENNAN COS COM 571748102 1,120,300 146,369 15.03 225,774 6.03 0.2980
2025-08-13 2025-06-30 13F MARSH & MCLENNAN COS COM 571748102 973,931 354,931 57.34 212,940 40.97 0.2833
2025-05-14 2025-03-31 13F MARSH & MCLENNAN COS COM 571748102 619,000 115,900 23.04 151,055 41.35 0.2286
2025-02-13 2024-12-31 13F MARSH & MCLENNAN COS COM 571748102 503,100 193,200 62.34 106,863 54.57 0.1582
2024-11-13 2024-09-30 13F MARSH & MCLENNAN COS COM 571748102 309,900 -29,700 -8.75 69,136 -3.39 0.1040
2024-08-09 2024-06-30 13F MARSH & MCLENNAN COS COM 571748102 339,600 59,581 21.28 71,561 125,443.86 0.1214
2024-05-13 2024-03-31 13F MARSH & MCLENNAN COS COM 571748102 280,019 -82,381 -22.73 58 -16.18 0.0907
2024-02-13 2023-12-31 13F MARSH & MCLENNAN COS COM 571748102 362,400 362,400 69 0.1063
2023-11-14 2023-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -130,700 -100.00 0 -100.00
2023-08-11 2023-06-30 13F MARSH & MCLENNAN COS COM 571748102 130,700 5,299 4.23 25 20.00 0.0354
2023-05-12 2023-03-31 13F MARSH & MCLENNAN COS COM 571748102 125,401 -163,800 -56.64 21 -57.45 0.0277
2023-02-13 2022-12-31 13F MARSH & MCLENNAN COS COM 571748102 289,201 -33,800 -10.46 48 -99.90 0.0655
2022-11-14 2022-09-30 13F MARSH & MCLENNAN COS COM 571748102 323,001 -350,000 -52.01 48,221 -53.85 0.0682
2022-08-12 2022-06-30 13F MARSH & MCLENNAN COS COM 571748102 673,001 240,900 55.75 104,483 41.89 0.1237
2022-05-13 2022-03-31 13F MARSH & MCLENNAN COS COM 571748102 432,101 242,600 128.02 73,639 123.56 0.0864
2022-02-11 2021-12-31 13F MARSH & MCLENNAN COS COM 571748102 189,501 108,501 133.95 32,939 168.54 0.0410
2021-11-12 2021-09-30 13F MARSH & MCLENNAN COS COM 571748102 81,000 -257,000 -76.04 12,266 -74.20 0.0158
2021-08-13 2021-06-30 13F MARSH & MCLENNAN COS COM 571748102 338,000 -536,900 -61.37 47,550 -55.38 0.0594
2021-05-13 2021-03-31 13F MARSH & MCLENNAN COS COM 571748102 874,900 789,600 925.67 106,563 967.77 0.1326
2021-02-10 2020-12-31 13F MARSH & MCLENNAN COS COM 571748102 85,300 3,800 4.66 9,980 6.76 0.0108
2020-11-13 2020-09-30 13F MARSH & MCLENNAN COS COM 571748102 81,500 -81,500 -50.00 9,348 -46.59 0.0093
2020-08-13 2020-06-30 13F MARSH & MCLENNAN COS COM 571748102 163,000 163,000 17,501 0.0151
2019-11-13 2019-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -413,200 -100.00 0 -100.00
2019-08-12 2019-06-30 13F MARSH & MCLENNAN COS COM 571748102 413,200 129,800 45.80 41,217 54.89 0.0363
2019-05-14 2019-03-31 13F MARSH & MCLENNAN COS COM 571748102 283,400 283,400 26,611 0.0242
2018-11-13 2018-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -262,900 -100.00 0 -100.00
2018-08-13 2018-06-30 13F/A-1 MARSH & MCLENNAN COS COM 571748102 262,900 187,200 247.29 21,550 244.69 0.0235
2018-08-13 2018-06-30 13F MARSH & MCLENNAN COS COM 571748102 75,700 6,252
2018-05-14 2018-03-31 13F MARSH & MCLENNAN COS COM 571748102 75,700 75,700 6,252 0.0068
2017-11-13 2017-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -113,700 -100.00 0 -100.00
2017-08-11 2017-06-30 13F MARSH & MCLENNAN COS COM 571748102 113,700 -190,500 -62.62 8,864 -60.56 0.0113
2017-05-12 2017-03-31 13F MARSH & MCLENNAN COS COM 571748102 304,200 -690,900 -69.43 22,477 -66.58 0.0314
2017-02-13 2016-12-31 13F MARSH & MCLENNAN COS COM 571748102 995,100 240,600 31.89 67,259 32.56 0.1064
2016-11-14 2016-09-30 13F MARSH & MCLENNAN COS COM 571748102 754,500 754,500 0.00 50,740 0.0897
2016-02-11 2015-12-31 13F MARSH & MCLENNAN COS COM 571748102 0 0 0 0.0000
2015-11-12 2015-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -74,800 -100.00 0 -100.00
2015-08-14 2015-06-30 13F MARSH & MCLENNAN COS COM 571748102 74,800 -268,100 -78.19 4,241 -77.95 0.0097
2015-05-13 2015-03-31 13F MARSH & MCLENNAN COS COM 571748102 342,900 338,500 7,693.18 19,233 7,532.14 0.0410
2015-02-13 2014-12-31 13F MARSH & MCLENNAN COS COM 571748102 4,400 4,400 -86.87 252 -82.73 0.0006
2014-02-14 2013-12-31 13F MARSH & MCLENNAN COS COM 571748102 0 -33,500 -100.00 0 -100.00
2013-11-13 2013-09-30 13F MARSH & MCLENNAN COS COM 571748102 33,500 -1,083,000 -97.00 1,459 -96.73 0.0035
2013-08-12 2013-06-30 13F MARSH & MCLENNAN COS COM 571748102 1,116,500 1,116,500 44,571 0.1169
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.