Marsh & McLennan Companies, Inc.
DE ˙ DB ˙ US5717481023
135,70 € ↓ -3,10 (-2,23%)
2026-06-03
DEL PRIS
SecurityDE:MSN / Marsh & McLennan Companies, Inc.
InstitutionConning Inc.
Latest Disclosed Ownership24,471 shares
Latest Disclosed Value $ 4,244,495
Conning Inc. reports 2.23% increase in ownership of MSN / Marsh & McLennan Companies, Inc.

On April 30, 2026 - Conning Inc. filed a 13F-HR form disclosing ownership of 24,471 shares of Marsh & McLennan Companies, Inc. (DE:MSN) valued at $3,662,085 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 23,938 shares of Marsh & McLennan Companies, Inc.. This represents a change in shares of 2.23% during the quarter. The current value of the position is $3,320,715 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)
2026-04-30 2026-03-31 13F MARSH & MCLENNAN COS COM 571748102 24,471 533 2.23 4,244 -4.41 0.1411
2026-02-05 2025-12-31 13F MARSH & MCLENNAN COS COM 571748102 23,938 3,476 16.99 4,441 7.69 0.1487
2025-10-28 2025-09-30 13F MARSH & MCLENNAN COS COM 571748102 20,462 1,438 7.56 4,124 -0.87 0.1371
2025-07-24 2025-06-30 13F MARSH & MCLENNAN COS COM 571748102 19,024 1,191 6.68 4,159 -4.41 0.1429
2025-04-29 2025-03-31 13F MARSH & MCLENNAN COS COM 571748102 17,833 -3,114 -14.87 4,352 -2.20 0.1522
2025-01-28 2024-12-31 13F MARSH & MCLENNAN COS COM 571748102 20,947 369 1.79 4,449 -3.07 0.1559
2024-10-29 2024-09-30 13F MARSH & MCLENNAN COS COM 571748102 20,578 -1,160 -5.34 4,591 0.22 0.1516
2024-07-26 2024-06-30 13F MARSH & MCLENNAN COS COM 571748102 21,738 18,100 497.53 4,581 511.48 0.1649
2024-04-26 2024-03-31 13F MARSH & MCLENNAN COS COM 571748102 3,638 -90 -2.41 749 6.09 0.0246
2024-01-30 2023-12-31 13F MARSH & MCLENNAN COS COM 571748102 3,728 0 0.00 706 -0.42 0.0246
2023-10-26 2023-09-30 13F MARSH & MCLENNAN COS COM 571748102 3,728 -40 -1.06 709 0.14 0.0259
2023-07-21 2023-06-30 13F MARSH & MCLENNAN COS COM 571748102 3,768 -440 -10.46 709 1.14 0.0237
2023-04-27 2023-03-31 13F MARSH & MCLENNAN COS COM 571748102 4,208 -481 -10.26 701 -9.68 0.0234
2023-02-08 2022-12-31 13F MARSH & MCLENNAN COS COM 571748102 4,689 -20 -0.42 776 10.24 0.0252
2022-10-31 2022-09-30 13F MARSH & MCLENNAN COS COM 571748102 4,709 -375 -7.38 703 -10.90 0.0250
2022-07-20 2022-06-30 13F MARSH & MCLENNAN COS COM 571748102 5,084 -30 -0.59 789 -9.52 0.0236
2022-05-02 2022-03-31 13F MARSH & MCLENNAN COS COM 571748102 5,114 -73 -1.41 872 -3.33 0.0237
2022-01-27 2021-12-31 13F MARSH & MCLENNAN COS COM 571748102 5,187 589 12.81 902 29.60 0.0240
2021-11-05 2021-09-30 13F MARSH & MCLENNAN COS COM 571748102 4,598 -1,570 -25.45 696 -19.82 0.0200
2021-07-29 2021-06-30 13F MARSH & MCLENNAN COS COM 571748102 6,168 -684 -9.98 868 3.95 0.0252
2021-04-23 2021-03-31 13F MARSH & MCLENNAN COS COM 571748102 6,852 -610 -8.17 835 -4.35 0.0251
2021-01-28 2020-12-31 13F MARSH & MCLENNAN COS COM 571748102 7,462 -220 -2.86 873 -0.91 0.0277
2020-10-21 2020-09-30 13F MARSH & MCLENNAN COS COM 571748102 7,682 130 1.72 881 8.63 0.0310
2020-08-07 2020-06-30 13F MARSH & MCLENNAN COS COM 571748102 7,552 595 8.55 811 34.72 0.0301
2020-04-29 2020-03-31 13F MARSH & MCLENNAN COS COM 571748102 6,957 -91 -1.29 602 -23.31 0.0256
2020-01-29 2019-12-31 13F MARSH & MCLENNAN COS COM 571748102 7,048 -480 -6.38 785 4.25 0.0257
2019-10-30 2019-09-30 13F MARSH & MCLENNAN COS COM 571748102 7,528 -1,050 -12.24 753 -12.03 0.0261
2019-07-25 2019-06-30 13F MARSH & MCLENNAN COS COM 571748102 8,578 -1,306 -13.21 856 -7.76 0.0283
2019-04-22 2019-03-31 13F MARSH & MCLENNAN COS COM 571748102 9,884 -30 -0.30 928 17.32 0.0290
2019-01-29 2018-12-31 13F MARSH & MCLENNAN COS COM 571748102 9,914 -1,060 -9.66 791 -12.89 0.0269
2018-10-26 2018-09-30 13F MARSH & MCLENNAN COS COM 571748102 10,974 -745 -6.36 908 -5.52 0.0269
2018-07-25 2018-06-30 13F MARSH & MCLENNAN COS COM 571748102 11,719 -450 -3.70 961 -4.38 0.0293
2018-05-03 2018-03-31 13F MARSH & MCLENNAN COS COM 571748102 12,169 0 0.00 1,005 1.52 0.0324
2018-01-30 2017-12-31 13F MARSH & MCLENNAN COS COM 571748102 12,169 -470 -3.72 990 -6.52 0.0327
2017-10-20 2017-09-30 13F MARSH & MCLENNAN COS COM 571748102 12,639 -130 -1.02 1,059 6.43 0.0360
2017-08-03 2017-06-30 13F MARSH & MCLENNAN COS COM 571748102 12,769 -200 -1.54 995 3.86 0.0361
2017-04-27 2017-03-31 13F MARSH & MCLENNAN COS COM 571748102 12,969 -40 -0.31 958 8.99 0.0354
2017-02-02 2016-12-31 13F MARSH & MCLENNAN COS COM 571748102 13,009 50 0.39 879 0.92 0.0351
2016-10-25 2016-09-30 13F MARSH & MCLENNAN COS COM 571748102 12,959 130 1.01 871 -0.80 0.0347
2016-07-26 2016-06-30 13F MARSH & MCLENNAN COS COM 571748102 12,829 100 0.79 878 13.44 0.0363
2016-04-26 2016-03-31 13F MARSH & MCLENNAN COS COM 571748102 12,729 220 1.76 774 11.53 0.0325
2016-02-04 2015-12-31 13F MARSH & MCLENNAN COS COM 571748102 12,509 -850 -6.36 694 -0.57 0.0297
2015-10-23 2015-09-30 13F MARSH & MCLENNAN COS COM 571748102 13,359 -1,510 -10.16 698 -17.20 0.0307
2015-08-03 2015-06-30 13F MARSH & MCLENNAN COS COM 571748102 14,869 -130 -0.87 843 0.24 0.0346
2015-04-24 2015-03-31 13F MARSH & MCLENNAN COS COM 571748102 14,999 -90 -0.60 841 -2.66 0.0358
2015-02-13 2014-12-31 13F MARSH & MCLENNAN COS COM 571748102 15,089 -550 -3.52 864 5.49 0.0422
2014-11-07 2014-09-30 13F MARSH & MCLENNAN COS COM 571748102 15,639 -280 -1.76 819 -0.73 0.0429
2014-07-25 2014-06-30 13F MARSH & MCLENNAN COS COM 571748102 15,919 -980 -5.80 825 -0.96 0.0438
2014-04-25 2014-03-31 13F MARSH & MCLENNAN COS COM 571748102 16,899 720 4.45 833 6.52 0.0489
2014-02-04 2013-12-31 13F MARSH & MCLENNAN COS COM 571748102 16,179 2,840 21.29 782 34.60 0.0485
2013-11-04 2013-09-30 13F MARSH & MCLENNAN COS COM 571748102 13,339 430 3.33 581 12.82 0.0449
2013-08-13 2013-06-30 13F MARSH & MCLENNAN COS COM 571748102 12,909 12,909 515 0.0425
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.