마쉬 앤 맥레넌 컴퍼니즈, Inc.
US ˙ NYSE ˙ US5717481023
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SecurityMMC / Marsh & McLennan Companies, Inc.
InstitutionGroup One Trading, L.p.
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Group One Trading, L.p. ownership in MMC / Marsh & McLennan Companies, Inc.

On February 11, 2026 - Group One Trading, L.p. filed a 13F-HR form disclosing ownership of 0 shares of Marsh & McLennan Companies, Inc. (US:MMC) valued at $0 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 12, 2025 disclosing 1,108 shares of Marsh & McLennan Companies, Inc.. This represents a change in shares of -100.00% during the quarter. The current value of the position is $0 USD.

Group One Trading, L.p. 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 2,000 of underlying shares valued at $371,040 USD and put options representing 400 of underlying shares valued at $74,208 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)
2026-02-11 2025-12-31 13F MARSH & MCLENNAN COS COM 571748102 0 -1,108 -100.00 0 -100.00
2025-11-12 2025-09-30 13F MARSH & MCLENNAN COS COM 571748102 1,108 1,108 223 0.0004
2025-08-14 2025-06-30 13F MARSH & MCLENNAN COS COM 571748102 0 -953 -100.00 0 -100.00
2025-05-14 2025-03-31 13F MARSH & MCLENNAN COS COM 571748102 953 -1,834 -65.81 233 -60.74 0.0007
2025-05-14 2024-12-31 13F/A-1 MARSH & MCLENNAN COS COM 571748102 2,787 2,787 592 0.0014
2025-02-14 2024-12-31 13F MARSH & MCLENNAN COS COM 571748102 2,787 2,787 592 0.0015
2024-05-10 2024-03-31 13F MARSH & MCLENNAN COS COM 571748102 0 -812 -100.00 0 -100.00
2024-02-14 2023-12-31 13F MARSH & MCLENNAN COS COM 571748102 812 812 154 0.0004
2023-02-09 2022-12-31 13F MARSH & MCLENNAN COS COM 571748102 0 -1,429 -100.00 0 -100.00
2022-11-09 2022-09-30 13F MARSH & MCLENNAN COS COM 571748102 1,429 1,429 213 0.0004
2022-08-11 2022-06-30 13F MARSH & MCLENNAN COS COM 571748102 0 -317 -100.00 0 -100.00
2022-05-12 2022-03-31 13F MARSH & MCLENNAN COS COM 571748102 317 317 54 0.0001
2019-11-12 2019-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -2,716 -100.00 0 -100.00
2019-08-09 2019-06-30 13F MARSH & MCLENNAN COS COM 571748102 2,716 2,716 271 0.0025
2018-05-16 2018-03-31 13F/A-1 MARSH & MCLENNAN COS COM 571748102 0 -100 -100.00 0 -100.00
2018-02-09 2017-12-31 13F MARSH & MCLENNAN COS COM 571748102 100 100 8 0.0001
2016-11-14 2016-09-30 13F MARSH & MCLENNAN COS COM 571748102 0 -2,566 -100.00 0 -100.00
2016-08-12 2016-06-30 13F MARSH & MCLENNAN COS COM 571748102 2,566 2,566 0.00 176 0.0021
2016-05-12 2016-03-31 13F MARSH & MCLENNAN COS COM 571748102 0 -9,866 -100.00 0 -100.00
2016-02-11 2015-12-31 13F MARSH & MCLENNAN COS COM 571748102 9,866 -29,392 -74.87 547 -73.32 0.0065
2015-11-20 2015-09-30 13F/A-1 MARSH & MCLENNAN COS COM 571748102 39,258 39,258 0.00 2,050 0.0283
2015-11-06 2015-09-30 13F MARSH & MCLENNAN COS COM 571748102 39,258 2,050
2015-02-11 2014-12-31 13F MARSH & MCLENNAN COS COM 571748102 0 -200 -100.00 0 -100.00
2014-10-31 2014-09-30 13F MARSH & MCLENNAN COS COM 571748102 200 -100 -33.33 10 -37.50 0.0002
2014-08-12 2014-06-30 13F MARSH & MCLENNAN COS COM 571748102 300 -700 -70.00 16 -66.67 0.0002
2014-01-31 2013-12-31 13F MARSH & MCLENNAN COS COM 571748102 1,000 300 42.86 48 71.43 0.0007
2013-08-02 2013-06-30 13F MARSH & MCLENNAN COS COM 571748102 700 700 28 0.0007
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
(%)
2026-02-11 2025-12-31 13F MARSH & MCLENNAN COS COM Call 2,000 -78.72 371 -80.41 n/a n/a n/a
2025-11-12 2025-09-30 13F MARSH & MCLENNAN COS COM Call 9,400 -14.55 1,894 -21.25 n/a n/a n/a
2025-08-14 2025-06-30 13F MARSH & MCLENNAN COS COM Call 11,000 -0.90 2,405 -11.19 n/a n/a n/a
2025-05-14 2025-03-31 13F MARSH & MCLENNAN COS COM Call 11,100 208.33 2,709 254.45 n/a n/a n/a
2025-05-14 2024-12-31 13F/A MARSH & MCLENNAN COS COM Call 3,600 500.00 765 474.44 n/a n/a n/a
2025-02-14 2024-12-31 13F MARSH & MCLENNAN COS COM Call 3,600 765 n/a n/a n/a
2024-11-14 2024-09-30 13F MARSH & MCLENNAN COS COM Call 600 134 n/a n/a n/a
2024-08-14 2024-06-30 13F MARSH & MCLENNAN COS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-05-10 2024-03-31 13F MARSH & MCLENNAN COS COM Call 1,100 -86.59 227 -85.45 n/a n/a n/a
2024-02-14 2023-12-31 13F MARSH & MCLENNAN COS COM Call 8,200 485.71 1,554 483.83 n/a n/a n/a
2023-11-09 2023-09-30 13F MARSH & MCLENNAN COS COM Call 1,400 -33.33 266 -32.49 n/a n/a n/a
2023-08-09 2023-06-30 13F MARSH & MCLENNAN COS COM Call 2,100 -32.26 395 -23.64 n/a n/a n/a
2023-05-12 2023-03-31 13F MARSH & MCLENNAN COS COM Call 3,100 -51.56 516 -51.27 n/a n/a n/a
2023-02-09 2022-12-31 13F MARSH & MCLENNAN COS COM Call 6,400 1,059 n/a n/a n/a
2022-08-11 2022-06-30 13F MARSH & MCLENNAN COS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-05-12 2022-03-31 13F MARSH & MCLENNAN COS COM Call 3,900 -96.11 665 -96.19 n/a n/a n/a
2022-02-11 2021-12-31 13F MARSH & MCLENNAN COS COM Call 100,300 522.98 17,434 615.09 n/a n/a n/a
2021-11-12 2021-09-30 13F MARSH & MCLENNAN COS COM Call 16,100 -56.60 2,438 -53.29 n/a n/a n/a
2021-08-10 2021-06-30 13F MARSH & MCLENNAN COS COM Call 37,100 16.30 5,219 34.34 n/a n/a n/a
2021-05-12 2021-03-31 13F MARSH & MCLENNAN COS COM Call 31,900 3,090.00 3,885 3,220.51 n/a n/a n/a
2021-02-10 2020-12-31 13F MARSH & MCLENNAN COS COM Call 1,000 -87.80 117 -87.57 n/a n/a n/a
2020-11-12 2020-09-30 13F MARSH & MCLENNAN COS COM Call 8,200 -1.20 941 5.61 n/a n/a n/a
2020-08-13 2020-06-30 13F MARSH & MCLENNAN COS COM Call 8,300 219.23 891 296.00 n/a n/a n/a
2020-05-13 2020-03-31 13F MARSH & MCLENNAN COS COM Call 2,600 225 n/a n/a n/a
2019-08-09 2019-06-30 13F MARSH & MCLENNAN COS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-05-14 2019-03-31 13F/A MARSH & MCLENNAN COS COM Call 57,600 0.00 5,409 17.74 n/a n/a n/a
2019-05-13 2019-03-31 13F MARSH & MCLENNAN COS COM Call 57,600 5,409 n/a n/a n/a
2019-02-05 2018-12-31 13F MARSH & MCLENNAN COS COM Call 57,600 1,820.00 4,594 1,752.42 n/a n/a n/a
2018-11-08 2018-09-30 13F MARSH & MCLENNAN COS COM Call 3,000 248 n/a n/a n/a
2018-08-13 2018-06-30 13F MARSH & MCLENNAN COS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-05-16 2018-03-31 13F/A MARSH & MCLENNAN COS COM Call 100 8 n/a n/a n/a
2018-05-10 2018-03-31 13F MARSH & MCLENNAN COS COM Call 100 826 n/a n/a n/a
2018-02-09 2017-12-31 13F MARSH & MCLENNAN COS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2017-11-15 2017-09-30 13F MARSH & MCLENNAN COS COM Call 800 -93.65 67 -93.18 n/a n/a n/a
2017-08-14 2017-06-30 13F MARSH & MCLENNAN COS COM Call 12,600 1.61 982 7.21 n/a n/a n/a
2017-05-10 2017-03-31 13F MARSH & MCLENNAN COS COM Call 12,400 -3.88 916 5.05 n/a n/a n/a
2017-02-15 2016-12-31 13F MARSH & MCLENNAN COS COM Call 12,900 -15.69 872 -15.26 n/a n/a n/a
2016-11-14 2016-09-30 13F MARSH & MCLENNAN COS COM Call 15,300 82.14 1,029 78.96 n/a n/a n/a
2016-08-12 2016-06-30 13F MARSH & MCLENNAN COS COM Call 8,400 37.70 575 54.99 n/a n/a n/a
2016-05-12 2016-03-31 13F MARSH & MCLENNAN COS COM Call 6,100 -88.79 371 -87.70 n/a n/a n/a
2016-02-11 2015-12-31 13F MARSH & MCLENNAN COS COM Call 54,400 3,016 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
(%)
2026-02-11 2025-12-31 13F MARSH & MCLENNAN COS COM Put 400 -93.33 74 -93.88 n/a n/a n/a
2025-11-12 2025-09-30 13F MARSH & MCLENNAN COS COM Put 6,000 -27.71 1,209 -33.35 n/a n/a n/a
2025-08-14 2025-06-30 13F MARSH & MCLENNAN COS COM Put 8,300 277.27 1,815 238.43 n/a n/a n/a
2025-05-14 2025-03-31 13F MARSH & MCLENNAN COS COM Put 2,200 450.00 537 538.10 n/a n/a n/a
2025-05-14 2024-12-31 13F/A MARSH & MCLENNAN COS COM Put 400 0.00 85 -5.62 n/a n/a n/a
2025-02-14 2024-12-31 13F MARSH & MCLENNAN COS COM Put 400 85 n/a n/a n/a
2024-11-14 2024-09-30 13F MARSH & MCLENNAN COS COM Put 400 89 n/a n/a n/a
2024-08-14 2024-06-30 13F MARSH & MCLENNAN COS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-05-10 2024-03-31 13F MARSH & MCLENNAN COS COM Put 4,000 1,900.00 824 2,124.32 n/a n/a n/a
2024-02-14 2023-12-31 13F MARSH & MCLENNAN COS COM Put 200 0.00 38 -2.63 n/a n/a n/a
2023-11-09 2023-09-30 13F MARSH & MCLENNAN COS COM Put 200 -71.43 38 -70.99 n/a n/a n/a
2023-08-09 2023-06-30 13F MARSH & MCLENNAN COS COM Put 700 132 n/a n/a n/a
2023-05-12 2023-03-31 13F MARSH & MCLENNAN COS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-02-09 2022-12-31 13F MARSH & MCLENNAN COS COM Put 1,600 0.00 265 10.46 n/a n/a n/a
2022-11-09 2022-09-30 13F MARSH & MCLENNAN COS COM Put 1,600 -73.77 239 -74.76 n/a n/a n/a
2022-08-11 2022-06-30 13F MARSH & MCLENNAN COS COM Put 6,100 74.29 947 58.89 n/a n/a n/a
2022-05-12 2022-03-31 13F MARSH & MCLENNAN COS COM Put 3,500 -93.43 596 -93.57 n/a n/a n/a
2022-02-11 2021-12-31 13F MARSH & MCLENNAN COS COM Put 53,300 542.17 9,265 637.07 n/a n/a n/a
2021-11-12 2021-09-30 13F MARSH & MCLENNAN COS COM Put 8,300 97.62 1,257 112.69 n/a n/a n/a
2021-08-10 2021-06-30 13F MARSH & MCLENNAN COS COM Put 4,200 35.48 591 56.35 n/a n/a n/a
2021-05-12 2021-03-31 13F MARSH & MCLENNAN COS COM Put 3,100 378 n/a n/a n/a
2020-11-12 2020-09-30 13F MARSH & MCLENNAN COS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-08-13 2020-06-30 13F MARSH & MCLENNAN COS COM Put 17,000 8,400.00 1,825 10,635.29 n/a n/a n/a
2020-05-13 2020-03-31 13F MARSH & MCLENNAN COS COM Put 200 17 n/a n/a n/a
2019-08-09 2019-06-30 13F MARSH & MCLENNAN COS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-05-14 2019-03-31 13F/A MARSH & MCLENNAN COS COM Put 5,700 535 n/a n/a n/a
2019-05-13 2019-03-31 13F MARSH & MCLENNAN COS COM Put 5,700 535 n/a n/a n/a
2016-05-12 2016-03-31 13F MARSH & MCLENNAN COS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2016-02-11 2015-12-31 13F MARSH & MCLENNAN COS COM Put 36,000 -32.08 1,996 -27.89 n/a n/a n/a
2015-11-20 2015-09-30 13F/A MARSH & MCLENNAN COS COM Put 53,000 2,768 n/a n/a n/a
2015-11-06 2015-09-30 13F MARSH & MCLENNAN COS COM Put 53,000 2,768 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.