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

SecurityMMC / Marsh & McLennan Companies, Inc.
InstitutionSimplex Trading, Llc
Latest Disclosed Ownership1,893 shares
Latest Disclosed Value $ 328,340
Simplex Trading, Llc ownership in MMC / Marsh & McLennan Companies, Inc.

On May 14, 2026 - Simplex Trading, Llc filed a 13F-HR form disclosing ownership of 1,893 shares of Marsh & McLennan Companies, Inc. (US:MMC) valued at $328,340 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 4,803 shares of Marsh & McLennan Companies, Inc.. This represents a change in shares of -60.59% during the quarter. The current value of the position is $345,851 USD.

Simplex Trading, Llc has a history of taking positions in derivatives of the underlying security (MMC) in the form of stock options. The firm currently holds call options representing 7,000 of underlying shares valued at $1,214,149 USD and put options representing 4,500 of underlying shares valued at $780,525 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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)
2026-05-14 2026-03-31 13F MARSH & MCLENNAN COS COM 571748102 1,893 -2,910 -60.59 328 -63.19 0.0002
2026-02-11 2025-12-31 13F MARSH & MCLENNAN COS COM 571748102 4,803 4,803 891 0.0005
2025-11-12 2025-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -1,152 -100.00 0 0.0000
2025-08-05 2025-06-30 13F MARSH & MCLENNAN COS COM 571748102 1,152 1,152 0 0.0001
2023-11-01 2023-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -8,529 -100.00 0 -100.00
2023-08-04 2023-06-30 13F MARSH & MCLENNAN COS COM 571748102 8,529 8,529 2 0.0013
2022-05-02 2022-03-31 13F MARSH & MCLENNAN COS COM 571748102 0 -30,377 -100.00 0 -100.00
2022-02-04 2021-12-31 13F MARSH & MCLENNAN COS COM 571748102 30,377 0 0.00 4,323 0.00 0.0040
2021-10-28 2021-09-30 13F MARSH & MCLENNAN COS COM 571748102 30,377 1,725 6.02 4,323 7.27 0.0040
2021-08-12 2021-06-30 13F MARSH & MCLENNAN COS COM 571748102 28,652 28,652 4,030 0.0039
2020-07-13 2020-06-30 13F MARSH & MCLENNAN COS COM 571748102 0 -7,365 -100.00 0 -100.00
2020-04-29 2020-03-31 13F MARSH & MCLENNAN COS COM 571748102 7,365 6,343 620.65 636 462.83 0.0011
2020-02-05 2019-12-31 13F MARSH & MCLENNAN COS COM 571748102 1,022 -2,729 -72.75 113 -69.87 0.0002
2019-10-15 2019-09-30 13F MARSH & MCLENNAN COS COM 571748102 3,751 -4,289 -53.35 375 -53.18 0.0011
2019-07-26 2019-06-30 13F MARSH & MCLENNAN COS COM 571748102 8,040 8,040 114.34 801 113.60 0.0022
2019-04-18 2019-03-31 13F MARSH & MCLENNAN COS COM 571748102 0 -5,870 -100.00 0 -100.00
2019-01-16 2018-12-31 13F MARSH & MCLENNAN COS COM 571748102 5,870 -1,490 -20.24 468 -23.03 0.0014
2018-10-23 2018-09-30 13F MARSH & MCLENNAN COS COM 571748102 7,360 4,313 141.55 608 144.18 0.0020
2018-07-30 2018-06-30 13F MARSH & MCLENNAN COS COM 571748102 3,047 3,047 -58.60 249 -59.05 0.0010
2018-04-26 2018-03-31 13F MARSH & MCLENNAN COS COM 571748102 0 -820 -100.00 0 -100.00
2018-01-10 2017-12-31 13F MARSH & MCLENNAN COS COM 571748102 820 820 66 0.0028
2017-07-12 2017-06-30 13F MARSH & MCLENNAN COS COM 571748102 0 -685 -100.00 0 -100.00
2017-04-21 2017-03-31 13F MARSH & MCLENNAN COS COM 571748102 685 685 50 0.0022
2017-01-11 2016-12-31 13F MARSH & MCLENNAN COS COM 571748102 0 -2,407 -100.00 0 -100.00
2016-10-07 2016-09-30 13F MARSH & MCLENNAN COS COM 571748102 2,407 2,407 0.00 161 0.0109
2016-04-14 2016-03-31 13F MARSH & MCLENNAN COS COM 571748102 0 -4,675 -100.00 0 -100.00
2016-01-20 2015-12-31 13F MARSH & MCLENNAN COS COM 571748102 4,675 -1,467 -23.88 259 -19.06 0.0203
2015-10-08 2015-09-30 13F MARSH & MCLENNAN COS COM 571748102 6,142 6,019 4,893.50 320 5,233.33 0.0235
2015-07-08 2015-06-30 13F MARSH & MCLENNAN COS COM 571748102 123 46 59.74 6 50.00 0.0005
2015-04-21 2015-03-31 13F MARSH & MCLENNAN COS COM 571748102 77 77 4 0.0005
Disclosed Call 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
(%)
2026-05-14 2026-03-31 13F MARSH & MCLENNAN COS CALL Call 7,000 -42.15 1,214 -45.90 n/a n/a n/a
2026-02-11 2025-12-31 13F MARSH & MCLENNAN COS CALL Call 12,100 -30.46 2,245 74,700.00 n/a n/a n/a
2025-11-12 2025-09-30 13F MARSH & MCLENNAN COS CALL Call 17,400 20.00 4 0.00 n/a n/a n/a
2025-08-05 2025-06-30 13F MARSH & MCLENNAN COS CALL Call 14,500 21.85 3 50.00 n/a n/a n/a
2025-05-12 2025-03-31 13F MARSH & MCLENNAN COS CALL Call 11,900 -59.39 3 -66.67 n/a n/a n/a
2025-02-11 2024-12-31 13F MARSH & MCLENNAN COS CALL Call 29,300 -39.21 6 -40.00 n/a n/a n/a
2024-11-08 2024-09-30 13F MARSH & MCLENNAN COS CALL Call 48,200 -6.95 11 0.00 n/a n/a n/a
2024-07-25 2024-06-30 13F MARSH & MCLENNAN COS CALL Call 51,800 16.14 11 11.11 n/a n/a n/a
2024-04-25 2024-03-31 13F MARSH & MCLENNAN COS CALL Call 44,600 -33.83 9 -25.00 n/a n/a n/a
2024-02-02 2023-12-31 13F MARSH & MCLENNAN COS CALL Call 67,400 228.78 13 300.00 n/a n/a n/a
2023-11-01 2023-09-30 13F MARSH & MCLENNAN COS CALL Call 20,500 439.47 4 n/a n/a n/a
2023-08-04 2023-06-30 13F MARSH & MCLENNAN COS CALL Call 3,800 -80.81 1 -100.00 n/a n/a n/a
2023-04-27 2023-03-31 13F MARSH & MCLENNAN COS CALL Call 19,800 117.58 3 200.00 n/a n/a n/a
2023-02-02 2022-12-31 13F MARSH & MCLENNAN COS CALL Call 9,100 160.00 2 -99.81 n/a n/a n/a
2022-11-04 2022-09-30 13F MARSH & MCLENNAN COS CALL Call 3,500 -89.10 522 -89.52 n/a n/a n/a
2022-08-03 2022-06-30 13F MARSH & MCLENNAN COS CALL Call 32,100 60.50 4,983 46.21 n/a n/a n/a
2022-05-02 2022-03-31 13F MARSH & MCLENNAN COS CALL Call 20,000 -5.66 3,408 -7.49 n/a n/a n/a
2022-02-23 2021-12-31 13F/A MARSH & MCLENNAN COS CALL Call 21,200 165.00 3,684 223.73 n/a n/a n/a
2022-02-04 2021-12-31 13F MARSH & MCLENNAN COS CALL Call 8,000 1,138 n/a n/a n/a
2021-10-28 2021-09-30 13F MARSH & MCLENNAN COS CALL Call 8,000 0.00 1,138 1.16 n/a n/a n/a
2021-08-12 2021-06-30 13F MARSH & MCLENNAN COS CALL Call 8,000 4,963.29 1,125 -41.53 n/a n/a n/a
2021-04-26 2021-03-31 13F MARSH & MCLENNAN COS CALL Call 158 -37.30 1,924 -34.74 n/a n/a n/a
2021-02-02 2020-12-31 13F MARSH & MCLENNAN COS CALL Call 252 -52.27 2,948 -51.32 n/a n/a n/a
2020-10-14 2020-09-30 13F MARSH & MCLENNAN COS CALL Call 528 113.77 6,056 128.36 n/a n/a n/a
2020-07-13 2020-06-30 13F MARSH & MCLENNAN COS CALL Call 247 517.50 2,652 668.70 n/a n/a n/a
2020-04-29 2020-03-31 13F MARSH & MCLENNAN COS CALL Call 40 -21.57 345 -39.26 n/a n/a n/a
2020-02-05 2019-12-31 13F MARSH & MCLENNAN COS CALL Call 51 -7.27 568 3.27 n/a n/a n/a
2019-10-15 2019-09-30 13F MARSH & MCLENNAN COS CALL Call 55 400.00 550 404.59 n/a n/a n/a
2019-07-26 2019-06-30 13F MARSH & MCLENNAN COS CALL Call 11 -88.04 109 -87.37 n/a n/a n/a
2019-04-18 2019-03-31 13F MARSH & MCLENNAN COS CALL Call 92 -24.59 863 -11.21 n/a n/a n/a
2019-01-16 2018-12-31 13F MARSH & MCLENNAN COS CALL Call 122 148.98 972 140.00 n/a n/a n/a
2018-10-23 2018-09-30 13F MARSH & MCLENNAN COS CALL Call 49 -74.21 405 -73.99 n/a n/a n/a
2018-07-30 2018-06-30 13F MARSH & MCLENNAN COS CALL Call 190 -45.71 1,557 6,977.27 n/a n/a n/a
2018-04-26 2018-03-31 13F MARSH & MCLENNAN COS CALL Call 350 17.06 22 -8.33 n/a n/a n/a
2018-01-10 2017-12-31 13F MARSH & MCLENNAN COS CALL Call 299 155.56 24 -42.86 n/a n/a n/a
2017-10-25 2017-09-30 13F MARSH & MCLENNAN COS CALL Call 117 23.16 42 40.00 n/a n/a n/a
2017-07-12 2017-06-30 13F MARSH & MCLENNAN COS CALL Call 95 -42.42 30 -44.44 n/a n/a n/a
2017-04-21 2017-03-31 13F MARSH & MCLENNAN COS CALL Call 165 1,733.33 54 80.00 n/a n/a n/a
2017-01-11 2016-12-31 13F MARSH & MCLENNAN COS CALL Call 9 -55.00 0 -100.00 n/a n/a n/a
2016-10-07 2016-09-30 13F MARSH & MCLENNAN COS CALL Call 20 -53.49 1 -97.14 n/a n/a n/a
2016-07-18 2016-06-30 13F MARSH & MCLENNAN COS CALL Call 43 -54.26 35 -42.62 n/a n/a n/a
2016-04-14 2016-03-31 13F MARSH & MCLENNAN COS CALL Call 94 -11.32 61 96.77 n/a n/a n/a
2016-01-20 2015-12-31 13F MARSH & MCLENNAN COS CALL Call 106 125.53 31 63.16 n/a n/a n/a
2015-10-08 2015-09-30 13F MARSH & MCLENNAN COS CALL Call 47 -55.66 19 -38.71 n/a n/a n/a
2015-07-08 2015-06-30 13F MARSH & MCLENNAN COS CALL Call 0 -100.00 0 -100.00 n/a n/a n/a
2015-04-21 2015-03-31 13F MARSH & MCLENNAN COS CALL Call 2 -91.30 0 -100.00 n/a n/a n/a
2015-03-04 2014-12-31 13F MARSH & MCLENNAN COS CALL Call 23 7 n/a n/a n/a
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
(%)
2026-05-14 2026-03-31 13F MARSH & MCLENNAN COS PUT Put 4,500 -34.78 781 -39.06 n/a n/a n/a
2026-02-11 2025-12-31 13F MARSH & MCLENNAN COS PUT Put 6,900 -55.48 1,280 42,566.67 n/a n/a n/a
2025-11-12 2025-09-30 13F MARSH & MCLENNAN COS PUT Put 15,500 -34.32 3 -40.00 n/a n/a n/a
2025-08-05 2025-06-30 13F MARSH & MCLENNAN COS PUT Put 23,600 43.03 5 25.00 n/a n/a n/a
2025-05-12 2025-03-31 13F MARSH & MCLENNAN COS PUT Put 16,500 14.58 4 33.33 n/a n/a n/a
2025-02-11 2024-12-31 13F MARSH & MCLENNAN COS PUT Put 14,400 -76.81 3 -76.92 n/a n/a n/a
2024-11-08 2024-09-30 13F MARSH & MCLENNAN COS PUT Put 62,100 166.52 14 225.00 n/a n/a n/a
2024-07-25 2024-06-30 13F MARSH & MCLENNAN COS PUT Put 23,300 21.35 5 33.33 n/a n/a n/a
2024-04-25 2024-03-31 13F MARSH & MCLENNAN COS PUT Put 19,200 -16.16 4 -25.00 n/a n/a n/a
2024-02-02 2023-12-31 13F MARSH & MCLENNAN COS PUT Put 22,900 -21.84 4 -20.00 n/a n/a n/a
2023-11-01 2023-09-30 13F MARSH & MCLENNAN COS PUT Put 29,300 266.25 6 400.00 n/a n/a n/a
2023-08-04 2023-06-30 13F MARSH & MCLENNAN COS PUT Put 8,000 31.15 2 0.00 n/a n/a n/a
2023-04-27 2023-03-31 13F MARSH & MCLENNAN COS PUT Put 6,100 258.82 1 n/a n/a n/a
2023-02-02 2022-12-31 13F MARSH & MCLENNAN COS PUT Put 1,700 41.67 0 -100.00 n/a n/a n/a
2022-11-04 2022-09-30 13F MARSH & MCLENNAN COS PUT Put 1,200 -83.10 179 -83.76 n/a n/a n/a
2022-08-03 2022-06-30 13F MARSH & MCLENNAN COS PUT Put 7,100 -55.90 1,102 -59.83 n/a n/a n/a
2022-05-02 2022-03-31 13F MARSH & MCLENNAN COS PUT Put 16,100 -54.52 2,743 -55.42 n/a n/a n/a
2022-02-23 2021-12-31 13F/A MARSH & MCLENNAN COS PUT Put 35,400 174.42 6,153 235.13 n/a n/a n/a
2022-02-04 2021-12-31 13F MARSH & MCLENNAN COS PUT Put 12,900 1,836 n/a n/a n/a
2021-10-28 2021-09-30 13F MARSH & MCLENNAN COS PUT Put 12,900 0.00 1,836 1.21 n/a n/a n/a
2021-08-12 2021-06-30 13F MARSH & MCLENNAN COS PUT Put 12,900 6,101.92 1,814 -28.39 n/a n/a n/a
2021-04-26 2021-03-31 13F MARSH & MCLENNAN COS PUT Put 208 -50.48 2,533 -48.45 n/a n/a n/a
2021-02-02 2020-12-31 13F MARSH & MCLENNAN COS PUT Put 420 195.77 4,914 201.84 n/a n/a n/a
2020-10-14 2020-09-30 13F MARSH & MCLENNAN COS PUT Put 142 -27.55 1,628 -22.62 n/a n/a n/a
2020-07-13 2020-06-30 13F MARSH & MCLENNAN COS PUT Put 196 -51.60 2,104 -39.90 n/a n/a n/a
2020-04-29 2020-03-31 13F MARSH & MCLENNAN COS PUT Put 405 10,025.00 3,501 7,856.82 n/a n/a n/a
2020-02-05 2019-12-31 13F MARSH & MCLENNAN COS PUT Put 4 -93.94 44 -93.33 n/a n/a n/a
2019-10-15 2019-09-30 13F MARSH & MCLENNAN COS PUT Put 66 11.86 660 12.24 n/a n/a n/a
2019-07-26 2019-06-30 13F MARSH & MCLENNAN COS PUT Put 59 -73.54 588 -71.91 n/a n/a n/a
2019-04-18 2019-03-31 13F MARSH & MCLENNAN COS PUT Put 223 -3.88 2,093 13.14 n/a n/a n/a
2019-01-16 2018-12-31 13F MARSH & MCLENNAN COS PUT Put 232 109.01 1,850 101.53 n/a n/a n/a
2018-10-23 2018-09-30 13F MARSH & MCLENNAN COS PUT Put 111 -28.85 918 -28.17 n/a n/a n/a
2018-07-30 2018-06-30 13F MARSH & MCLENNAN COS PUT Put 156 0.65 1,278 14,100.00 n/a n/a n/a
2018-04-26 2018-03-31 13F MARSH & MCLENNAN COS PUT Put 155 124.64 9 125.00 n/a n/a n/a
2018-01-10 2017-12-31 13F MARSH & MCLENNAN COS PUT Put 69 -40.00 4 33.33 n/a n/a n/a
2017-10-25 2017-09-30 13F MARSH & MCLENNAN COS PUT Put 115 8.49 3 -62.50 n/a n/a n/a
2017-07-12 2017-06-30 13F MARSH & MCLENNAN COS PUT Put 106 1,077.78 8 166.67 n/a n/a n/a
2017-04-21 2017-03-31 13F MARSH & MCLENNAN COS PUT Put 9 -83.64 0 -100.00 n/a n/a n/a
2017-01-11 2016-12-31 13F MARSH & MCLENNAN COS PUT Put 55 -49.54 2 100.00 n/a n/a n/a
2016-10-07 2016-09-30 13F MARSH & MCLENNAN COS PUT Put 109 -29.22 1 -83.33 n/a n/a n/a
2016-07-18 2016-06-30 13F MARSH & MCLENNAN COS PUT Put 154 -26.67 6 -75.00 n/a n/a n/a
2016-04-14 2016-03-31 13F MARSH & MCLENNAN COS PUT Put 210 677.78 24 2,300.00 n/a n/a n/a
2016-01-20 2015-12-31 13F MARSH & MCLENNAN COS PUT Put 27 -72.45 1 -97.14 n/a n/a n/a
2015-10-08 2015-09-30 13F MARSH & MCLENNAN COS PUT Put 98 9,700.00 35 3,400.00 n/a n/a n/a
2015-07-08 2015-06-30 13F MARSH & MCLENNAN COS PUT Put 1 0.00 0 -100.00 n/a n/a n/a
2015-04-21 2015-03-31 13F MARSH & MCLENNAN COS PUT Put 1 -50.00 0 n/a n/a n/a
2015-03-04 2014-12-31 13F MARSH & MCLENNAN COS PUT Put 2 0 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.