Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionOakcliff Capital Partners, LP
Latest Disclosed Ownership1,030,740 shares
Latest Disclosed Value $ 69,131,732
Oakcliff Capital Partners, LP ownership in IBKR / Interactive Brokers Group, Inc.

On May 15, 2026 - Oakcliff Capital Partners, LP filed a 13F-HR form disclosing ownership of 1,030,740 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $69,131,732 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,030,740 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 0.00% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-15 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,030,740 0 0.00 69,132 4.29 30.5037
2026-02-17 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,030,740 0 0.00 66,287 -6.54 28.4191
2025-11-14 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,030,740 0 0.00 70,925 24.18 30.6125
2025-08-14 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,030,740 773,055 300.00 57,113 33.85 28.5425
2025-05-15 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 257,685 -42,000 -14.01 42,670 -19.41 22.4847
2025-02-14 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 299,685 -2,962 -0.98 52,945 25.53 27.0726
2024-11-14 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 302,647 0 0.00 42,177 13.67 21.2095
2024-08-14 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 302,647 0 0.00 37,105 9.75 19.8433
2024-05-15 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 302,647 -37,000 -10.89 33,809 20.07 20.2580
2024-02-14 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 339,647 0 0.00 28,157 -4.23 17.7229
2023-11-14 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 339,647 0 0.00 29,400 4.20 20.1884
2023-08-14 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 339,647 0 0.00 28,214 0.62 18.7934
2023-05-15 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 339,647 0 0.00 28,041 14.11 19.5370
2023-02-14 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 339,647 -21,600 -5.98 24,573 6.44 18.3299
2022-11-14 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 361,247 0 0.00 23,087 16.18 19.4096
2022-08-15 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 361,247 61,400 20.48 19,872 0.55 14.6526
2022-05-16 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 299,847 38,000 14.51 19,763 -4.97 10.2466
2022-02-14 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 261,847 0 0.00 20,796 27.40 9.5004
2021-11-15 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 261,847 0 0.00 16,324 -5.15 7.2272
2021-08-16 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 261,847 0 0.00 17,211 -10.01 7.4140
2021-05-17 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 261,847 -105,500 -28.72 19,125 -14.54 9.0715
2021-02-16 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 367,347 -20,939 -5.39 22,379 19.25 8.8830
2020-11-16 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 388,286 0 0.00 18,766 15.70 8.1269
2020-08-14 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 388,286 0 0.00 16,219 -3.24 8.6229
2020-05-15 2020-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 388,286 4,331 1.13 16,762 -6.36 11.7246
2020-02-14 2019-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 383,955 40,000 11.63 17,900 -3.23 10.6813
2019-11-14 2019-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 343,955 0 0.00 18,498 -0.77 12.5137
2019-08-14 2019-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 343,955 0 0.00 18,642 4.47 13.7373
2019-05-15 2019-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 343,955 0 0.00 17,844 -5.07 12.9573
2019-02-14 2018-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 343,955 58,000 20.28 18,797 18.85 15.4564
2018-11-14 2018-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 285,955 56,486 24.62 15,816 7.01 11.7404
2018-08-14 2018-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 229,469 -15,027 -6.15 14,780 -10.09 11.1898
2018-05-15 2018-03-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 244,496 -74,973 -23.47 16,439 -13.09 14.0668
2018-05-14 2018-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 244,496 -74,973 16,439
2018-02-13 2017-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 319,469 -144,419 -31.13 18,915 -9.47 16.5924
2017-11-14 2017-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 463,888 -20,466 -4.23 20,893 15.27 17.6238
2017-08-14 2017-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 484,354 0 0.00 18,125 7.78 16.7650
2017-05-12 2017-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 484,354 484,354 16,817 16.0913
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.