CME Group Inc.
BG ˙ BUL ˙ US12572Q1058
SecurityBG:MX4A / CME Group Inc.
InstitutionMariner, LLC
Latest Disclosed Ownership357,919 shares
Latest Disclosed Value $ 105,711,399
Mariner, LLC reports 4.60% increase in ownership of MX4A / CME Group Inc.

On May 13, 2026 - Mariner, LLC filed a 13F-HR form disclosing ownership of 357,919 shares of CME Group Inc. (BG:MX4A) valued at $105,711,399 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 342,166 shares of CME Group Inc.. This represents a change in shares of 4.60% during the quarter.

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)
2026-05-13 2026-03-31 13F CME GROUP COM 12572Q105 357,919 15,753 4.60 105,711 13.14 0.1018
2026-02-13 2025-12-31 13F CME GROUP COM 12572Q105 342,166 62,727 22.45 93,436 23.75 0.1112
2025-11-14 2025-09-30 13F CME GROUP COM 12572Q105 279,439 148,901 114.07 75,502 109.85 0.0976
2025-08-14 2025-06-30 13F CME GROUP COM 12572Q105 130,538 20,434 18.56 35,978 23.18 0.0519
2025-05-15 2025-03-31 13F CME GROUP COM 12572Q105 110,104 12,052 12.29 29,208 28.27 0.0486
2025-02-13 2024-12-31 13F CME GROUP COM 12572Q105 98,052 4,024 4.28 22,770 9.79 0.0382
2024-11-13 2024-09-30 13F CME GROUP COM 12572Q105 94,028 2,025 2.20 20,740 14.67 0.0368
2024-08-13 2024-06-30 13F CME GROUP COM 12572Q105 92,003 -164 -0.18 18,087 -8.84 0.0351
2024-05-15 2024-03-31 13F CME GROUP COM 12572Q105 92,167 797 0.87 19,843 3.12 0.0410
2024-02-14 2023-12-31 13F CME GROUP COM 12572Q105 91,370 2,418 2.72 19,243 8.04 0.0456
2023-11-13 2023-09-30 13F CME GROUP COM 12572Q105 88,952 2,037 2.34 17,810 10.59 0.0478
2023-08-11 2023-06-30 13F CME GROUP COM 12572Q105 86,915 -1,780 -2.01 16,104 100,550.00 0.0430
2023-05-15 2023-03-31 13F CME GROUP COM 12572Q105 88,695 16,667 23.14 17 -99.87 0.0493
2023-02-14 2022-12-31 13F CME GROUP COM 12572Q105 72,028 -3,212 -4.27 12,112 -9.12 0.0389
2022-11-10 2022-09-30 13F CME GROUP COM 12572Q105 75,240 6,756 9.87 13,327 -4.93 0.0533
2022-08-15 2022-06-30 13F CME GROUP COM 12572Q105 68,484 829 1.23 14,018 -12.89 0.0576
2022-05-13 2022-03-31 13F CME GROUP COM 12572Q105 67,655 6,767 11.11 16,092 15.69 0.0607
2022-02-14 2021-12-31 13F CME GROUP COM 12572Q105 60,888 1,415 2.38 13,910 20.95 0.0588
2021-11-15 2021-09-30 13F CME GROUP COM 12572Q105 59,473 792 1.35 11,501 -7.84 0.0600
2021-08-24 2021-06-30 13F CME GROUP COM 12572Q105 58,681 3,715 6.76 12,480 11.17 0.0774
2021-05-07 2021-03-31 13F CME GROUP COM 12572Q105 54,966 -1,069 -1.91 11,226 10.05 0.0783
2021-02-16 2020-12-31 13F CME GROUP COM 12572Q105 56,035 4,989 9.77 10,201 19.45 0.0782
2020-11-13 2020-09-30 13F CME GROUP COM 12572Q105 51,046 -1,231 -2.35 8,540 0.51 0.0804
2020-08-14 2020-06-30 13F CME GROUP COM 12572Q105 52,277 157 0.30 8,497 -5.75 0.0852
2020-05-14 2020-03-31 13F CME GROUP COM 12572Q105 52,120 52,120 -0.30 9,015 6.10 0.1126
2019-11-13 2019-09-30 13F CME GROUP COM 12572Q105 0 -8,604 -100.00 0 -100.00
2019-08-14 2019-06-30 13F CME GROUP COM 12572Q105 8,604 1,279 17.46 1,670 38.47 0.0199
2019-05-15 2019-03-31 13F CME GROUP COM CL A 12572Q105 7,325 992 15.66 1,206 1.26 0.0172
2019-02-13 2018-12-31 13F CME GROUP COM CL A 12572Q105 6,333 886 16.27 1,191 28.48 0.0212
2018-11-14 2018-09-30 13F CME GROUP COM CL A 12572Q105 5,447 84 1.57 927 5.46 0.0238
2018-08-14 2018-06-30 13F CME GROUP COM CL A 12572Q105 5,363 733 15.83 879 17.36 0.0249
2018-05-15 2018-03-31 13F CME GROUP COM CL A 12572Q105 4,630 616 15.35 749 27.60 0.0268
2018-02-09 2017-12-31 13F CME GROUP COM CL A 12572Q105 4,014 1,385 52.68 587 64.43 0.0227
2017-11-14 2017-09-30 13F CME GROUP COM CL A 12572Q105 2,629 -514 -16.35 357 -9.39 0.0161
2017-08-11 2017-06-30 13F CME GROUP COM 12572Q105 3,143 -17,657 -84.89 394 -84.06 0.0185
2017-05-15 2017-03-31 13F CME GROUP COM 12572Q105 20,800 -634 -2.96 2,471 -0.08 0.1076
2017-02-14 2016-12-31 13F CME GROUP COM 12572Q105 21,434 -1,146 -5.08 2,473 4.79 0.1140
2016-11-14 2016-09-30 13F CME GROUP COM 12572Q105 22,580 604 2.75 2,360 10.28 0.1140
2016-08-12 2016-06-30 13F CME GROUP COM 12572Q105 21,976 10,792 96.49 2,140 99.26 0.1158
2016-05-13 2016-03-31 13F CME GROUP COM 12572Q105 11,184 6,184 123.68 1,074 137.09 0.0638
2016-02-16 2015-12-31 13F CME GROUP COM 12572Q105 5,000 0 0.00 453 -2.37 0.0291
2015-11-16 2015-09-30 13F CME GROUP COM 12572Q105 5,000 5,000 464 0.0206
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.