Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionBrooktree Capital Management
Latest Disclosed Ownership272,252 shares
Latest Disclosed Value $ 18,259,942
Brooktree Capital Management reports 32.06% decrease in ownership of IBKR / Interactive Brokers Group, Inc.

On May 6, 2026 - Brooktree Capital Management filed a 13F-HR form disclosing ownership of 272,252 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $18,259,942 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 400,728 shares of Interactive Brokers Group, Inc.. This represents a change in shares of -32.06% 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)
2026-05-06 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 272,252 -128,476 -32.06 18,260 -29.15 14.4779
2026-02-02 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 400,728 -16,138 -3.87 25,771 -10.16 17.1432
2025-11-07 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 416,866 -84,973 -16.93 28,685 3.16 18.2284
2025-08-06 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 501,839 375,254 296.44 27,807 32.66 18.1825
2025-05-06 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 126,585 -6,441 -4.84 20,961 -10.81 15.7275
2025-02-10 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 133,026 -4,586 -3.33 23,502 22.55 17.4282
2024-11-06 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 137,612 -1,397 -1.00 19,178 12.53 15.5771
2024-08-05 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 139,009 -12,866 -8.47 17,043 0.45 14.5739
2024-05-06 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 151,875 -6,198 -3.92 16,966 29.46 13.0849
2024-02-05 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 158,073 -11,791 -6.94 13,104 -10.88 10.5907
2023-11-06 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 169,864 -1,799 -1.05 14,703 3.11 12.2809
2023-08-08 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 171,663 -6,308 -3.54 14,260 -2.95 10.8413
2023-05-08 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 177,971 -7,310 -3.95 14,693 9.61 11.4413
2023-02-07 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 185,281 -3,537 -1.87 13,405 11.09 11.0135
2022-11-07 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 188,818 3,272 1.76 12,067 18.22 9.9359
2022-08-08 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 185,546 4,024 2.22 10,207 -14.69 7.6685
2022-05-09 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 181,522 41,390 29.54 11,964 7.50 7.7978
2022-02-07 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 140,132 1,135 0.82 11,129 28.44 6.8005
2021-11-09 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 138,997 2,197 1.61 8,665 -3.64 5.5216
2021-08-09 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 136,800 1,334 0.98 8,992 -9.12 5.7723
2021-05-03 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 135,466 774 0.57 9,894 20.59 6.6287
2021-02-03 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 134,692 -2,646 -1.93 8,205 23.63 6.0371
2020-11-09 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 137,338 6,254 4.77 6,637 21.22 5.6172
2020-08-18 2020-06-30 13F/A-1 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 131,084 6,904 5.56 5,475 2.13 5.1486
2020-08-03 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 131,084 6,904 5,475 5,427,025.0981
2020-05-06 2020-03-31 13F INTERACTIVE BROKERS GROUP INC COM CL A Stock 45841N107 124,180 42,236 51.54 5,361 40.34 6.2109
2020-02-26 2019-12-31 13F INTERACTIVE BROKERS GROUP INC COM CL A Stock 45841N107 81,944 81,944 3,820 3.5043
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.