Marsh & McLennan Companies, Inc.
US ˙ NYSE ˙ US5717481023
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT

SecurityMMC / Marsh & McLennan Companies, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership273,786 shares
Latest Disclosed Value $ 50,793,163
Sei Investments Co ownership in MMC / Marsh & McLennan Companies, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 273,786 shares of Marsh & McLennan Companies, Inc. (US:MMC) valued at $50,792,779 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 288,181 shares of Marsh & McLennan Companies, Inc.. This represents a change in shares of -5.00% during the quarter. The current value of the position is $50,020,702 USD.

Sei Investments Co has a history of taking positions in derivatives of the underlying security (MMC) in the form of stock options.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MMC / Marsh & McLennan Companies, Inc. Historical Put/Call Ratio
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)
2026-02-13 2025-12-31 13F MARSH & MCLENNAN COS COM 571748102 273,786 -14,395 -5.00 50,793 -12.54 0.0501
2025-11-13 2025-09-30 13F MARSH & MCLENNAN COS COM 571748102 288,181 18,726 6.95 58,078 -1.42 0.0625
2025-08-14 2025-06-30 13F MARSH & MCLENNAN COS COM 571748102 269,455 -8,279 -2.98 58,914 -13.07 0.0683
2025-05-14 2025-03-31 13F/A-1 MARSH & MCLENNAN COS COM 571748102 277,734 -18,078 -6.11 67,774 7.87 0.0872
2025-05-13 2025-03-31 13F MARSH & MCLENNAN COS COM 571748102 296,665 853 65,003 0.0707
2025-02-11 2024-12-31 13F MARSH & MCLENNAN COS COM 571748102 295,812 -52,605 -15.10 62,833 -19.16 0.0807
2024-11-12 2024-09-30 13F MARSH & MCLENNAN COS COM 571748102 348,417 17,483 5.28 77,728 11.46 0.1009
2024-08-13 2024-06-30 13F MARSH & MCLENNAN COS COM 571748102 330,934 -24,036 -6.77 69,736 -4.62 0.0988
2024-05-07 2024-03-31 13F MARSH & MCLENNAN COS COM 571748102 354,970 -12,750 -3.47 73,118 4.95 0.1071
2024-02-14 2023-12-31 13F MARSH & MCLENNAN COS COM 571748102 367,720 -15,457 -4.03 69,671 -4.45 0.1118
2023-11-14 2023-09-30 13F MARSH & MCLENNAN COS COM 571748102 383,177 -16,066 -4.02 72,917 -2.90 0.1310
2023-08-11 2023-06-30 13F MARSH & MCLENNAN COS COM 571748102 399,243 6,877 1.75 75,091 14.91 0.1310
2023-05-12 2023-03-31 13F MARSH & MCLENNAN COS COM 571748102 392,366 94,932 31.92 65,349 32.77 0.1214
2023-02-10 2022-12-31 13F MARSH & MCLENNAN COS COM 571748102 297,434 -76,423 -20.44 49,219 -11.82 0.1094
2022-11-14 2022-09-30 13F MARSH & MCLENNAN COS COM 571748102 373,857 5,492 1.49 55,814 -2.41 0.1245
2022-08-15 2022-06-30 13F MARSH & MCLENNAN COS COM 571748102 368,365 107,279 41.09 57,192 28.41 0.1235
2022-05-13 2022-03-31 13F MARSH & MCLENNAN COS COM 571748102 261,086 -9,910 -3.66 44,538 -5.36 0.0895
2022-02-14 2021-12-31 13F MARSH & MCLENNAN COS COM 571748102 270,996 -27,670 -9.26 47,062 3.92 0.0883
2021-11-12 2021-09-30 13F MARSH & MCLENNAN COS COM 571748102 298,666 -33,780 -10.16 45,285 -3.38 0.0950
2021-08-06 2021-06-30 13F MARSH & MCLENNAN COS COM 571748102 332,446 59,157 21.65 46,870 41.93 0.1039
2021-05-12 2021-03-31 13F MARSH & MCLENNAN COS COM 571748102 273,289 10,476 3.99 33,023 7.26 0.0832
2021-02-08 2020-12-31 13F MARSH & MCLENNAN COS COM 571748102 262,813 -71,770 -21.45 30,787 -19.71 0.0796
2020-12-04 2020-09-30 13F/A-1 MARSH & MCLENNAN COS COM 571748102 334,583 -6,074 -1.78 38,344 4.80 0.1110
2020-11-06 2020-09-30 13F MARSH & MCLENNAN COS COM 571748102 337,121 -3,536 38,635 93,024.4899
2020-08-17 2020-06-30 13F/A-1 MARSH & MCLENNAN COS COM 571748102 340,657 -13,650 -3.85 36,587 19.32 0.1135
2020-08-11 2020-06-30 13F MARSH & MCLENNAN COS COM 571748102 312,432 -41,875 34,649 93,987.2569
2020-05-14 2020-03-31 13F MARSH & MCLENNAN COS COM 571748102 354,307 51,598 17.05 30,663 -9.08 0.1126
2020-02-06 2019-12-31 13F MARSH & MCLENNAN COS COM 571748102 302,709 -170,352 -36.01 33,727 -28.77 0.1006
2019-11-12 2019-09-30 13F MARSH & MCLENNAN COS COM 571748102 473,061 184,712 64.06 47,349 64.81 0.1211
2019-08-14 2019-06-30 13F MARSH & MCLENNAN COS COM 571748102 288,349 -17,724 -5.79 28,729 -0.02 0.0938
2019-05-15 2019-03-31 13F MARSH & MCLENNAN COS COM 571748102 306,073 -68,931 -18.38 28,734 -7.19 0.0965
2019-02-13 2018-12-31 13F MARSH & MCLENNAN COS COM 571748102 375,004 2,903 0.78 30,960 0.67 0.1102
2018-11-08 2018-09-30 13F MARSH & MCLENNAN COS COM 571748102 372,101 -58,953 -13.68 30,755 -12.96 0.1115
2018-08-03 2018-06-30 13F MARSH & MCLENNAN COS COM 571748102 431,054 -144,194 -25.07 35,333 -25.63 0.1201
2018-05-11 2018-03-31 13F MARSH & MCLENNAN COS COM 571748102 575,248 48,194 9.14 47,510 10.76 0.1821
2018-02-08 2017-12-31 13F MARSH & MCLENNAN COS COM 571748102 527,054 -40,930 -7.21 42,896 -9.89 0.1490
2017-11-06 2017-09-30 13F MARSH & MCLENNAN COS COM 571748102 567,984 -28,564 -4.79 47,602 2.35 0.1692
2017-07-31 2017-06-30 13F MARSH & MCLENNAN COS COM 571748102 596,548 -118,280 -16.55 46,507 -11.95 0.1854
2017-05-05 2017-03-31 13F MARSH & MCLENNAN COS COM 571748102 714,828 -14,988 -2.05 52,819 7.08 0.2315
2017-02-02 2016-12-31 13F MARSH & MCLENNAN COS COM 571748102 729,816 34,467 4.96 49,328 5.49 0.2389
2016-11-04 2016-09-30 13F MARSH & MCLENNAN COS COM 571748102 695,349 67,472 10.75 46,762 8.79 0.2375
2016-08-11 2016-06-30 13F MARSH & MCLENNAN COS COM 571748102 627,877 59,598 10.49 42,984 24.43 0.2578
2016-05-10 2016-03-31 13F/A-1 MARSH & MCLENNAN COS COM 571748102 568,279 -104,460 -15.53 34,546 -7.39 0.2150
2016-02-03 2015-12-31 13F MARSH & MCLENNAN COS COM 571748102 672,739 197,535 41.57 37,304 50.33 0.2274
2015-11-02 2015-09-30 13F/A-1 MARSH & MCLENNAN COS COM 571748102 475,204 8,599 1.84 24,815 -6.21 0.2278
2015-10-30 2015-09-30 13F MARSH & MCLENNAN COS COM 571748102 475,204 24,816
2015-08-07 2015-06-30 13F/A-1 MARRONE BIO INNOVATIONS PUT 571748102 0 -593,871 -100.00 0 -100.00
2015-08-07 2015-06-30 13F/A-1 MARSH & MCLENNAN COS COM 571748102 466,605 -127,266 -21.43 26,457 -20.57 0.2392
2015-08-04 2015-06-30 13F MARSH & MCLENNAN COS COM 571748102 466,605 -127,266 26,457 0.2392
2015-05-14 2015-03-31 13F/A-1 MARSH & MCLENNAN COS COM 571748102 593,871 101,115 20.52 33,310 18.10 0.2893
2015-05-01 2015-03-31 13F MARRONE BIO INNOVATIONS PUT 571748102 593,871 593,871 33,310 0.2893
2015-02-10 2014-12-31 13F MARSH & MCLENNAN COS COM 571748102 492,756 492,756 28,205 0.2493
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2015-08-07 2015-06-30 13F/A MARRONE BIO INNOVATIONS PUT 0 -100.00 0 -100.00 n/a n/a n/a
2015-05-01 2015-03-31 13F MARRONE BIO INNOVATIONS PUT 593,871 33,310 n/a n/a n/a
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.