Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership19,092,105 shares
Latest Disclosed Value $ 1,280,507,482
State Street Corp reports 1.36% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 19,092,105 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $1,280,507,482 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 18,836,521 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 1.36% 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)
2026-05-15 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 19,092,105 255,584 1.36 1,280,507 5.71 0.0442
2026-02-13 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 18,836,521 187,763 1.01 1,211,377 -5.60 0.0406
2025-11-14 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 18,648,758 3,517,729 23.25 1,283,221 53.05 0.0445
2025-08-14 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 15,131,029 11,360,260 301.27 838,410 34.27 0.0314
2025-05-15 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,770,769 416,179 12.41 624,402 5.36 0.0257
2025-02-14 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,354,590 132,455 4.11 592,655 31.98 0.0234
2024-11-14 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,222,135 52,911 1.67 449,037 15.57 0.0183
2024-08-14 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,169,224 -21,156 -0.66 388,547 9.02 0.0170
2024-05-15 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,190,380 95,429 3.08 356,397 38.91 0.0159
2024-02-14 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,094,951 130,171 4.39 256,571 -0.02 0.0125
2023-11-14 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,964,780 145,965 5.18 256,631 9.60 0.0142
2023-08-14 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,818,815 76,695 2.80 234,159 3.43 0.0123
2023-05-15 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,742,120 46,055 1.71 226,389 16.06 0.0128
2023-05-15 2022-12-31 13F/A-99 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,696,065 59,576 2.26 195,060 15.76 0.0115
2023-05-15 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,696,065 59,576 195,060 0.0115
2022-11-15 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,636,489 340,288 14.82 168,498 33.40 0.0107
2022-08-15 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,296,201 34,967 1.55 126,314 -15.25 0.0076
2022-05-16 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,261,234 30,803 1.38 149,038 -15.86 0.0074
2022-02-14 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,230,431 85,055 3.96 177,141 32.45 0.0084
2021-11-15 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,145,376 108,630 5.33 133,743 -0.10 0.0071
2021-08-16 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,036,746 241,373 13.44 133,875 2.09 0.0071
2021-07-09 2021-03-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,795,373 10,365 0.58 131,134 20.59 0.0075
2021-05-17 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,795,373 10,365 131,134 0.0075
2021-02-16 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,785,008 98,045 5.81 108,743 33.38 0.0067
2020-11-10 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,686,963 7,705 0.46 81,531 16.24 0.0056
2020-08-14 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,679,258 -117,984 -6.56 70,143 -9.59 0.0051
2020-06-19 2020-03-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,797,242 22,660 1.28 77,587 -6.22 0.0068
2020-05-11 2020-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,797,242 22,660 77,587 6,813.7008
2020-02-06 2019-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,774,582 -21,149 -1.18 82,731 -14.33 0.0057
2019-11-14 2019-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,795,731 -9,953 -0.55 96,574 -1.32 0.0072
2019-08-14 2019-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,805,684 48,189 2.74 97,868 7.34 0.0073
2019-05-15 2019-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,757,495 46,120 2.69 91,179 -2.51 0.0071
2019-02-12 2018-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,711,375 -192,326 -10.10 93,527 -11.18 0.0085
2018-11-09 2018-09-30 13F INTERACTIVE BROKERS GROUP Common Stock 45841N107 1,903,701 82,964 4.56 105,295 -10.22 0.0081
2018-08-14 2018-06-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 1,820,737 -55,103 -2.94 117,279 -7.02 0.0098
2018-05-15 2018-03-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 1,875,840 -22,882 -1.21 126,131 12.19 0.0107
2018-02-14 2017-12-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 1,898,722 711,582 59.94 112,424 110.25 0.0090
2017-11-14 2017-09-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 1,187,140 49,098 4.31 53,471 25.57 0.0046
2017-08-14 2017-06-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 1,138,042 -34,456 -2.94 42,583 4.62 0.0038
2017-05-15 2017-03-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 1,172,498 105,435 9.88 40,704 4.48 0.0036
2017-02-09 2016-12-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 1,067,063 75,971 7.67 38,958 11.43 0.0037
2017-01-13 2016-09-30 13F/A-1 INTERACTIVE BROKERS GROUP Common equity shares 45841N107 991,092 102,317 11.51 34,961 11.12 0.0035
2016-11-14 2016-09-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 991,092 34,961
2016-08-12 2016-06-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 888,775 41,588 4.91 31,461 -5.56 0.0034
2016-05-20 2016-03-31 13F/A-1 INTERACTIVE BROKERS GROUP Common equity shares 45841N107 847,187 10,173 1.22 33,313 -8.73 0.0036
2016-05-12 2016-03-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 847,187 33,313
2016-02-16 2015-12-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 837,014 20,071 2.46 36,500 13.19 0.0040
2015-11-16 2015-09-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 816,943 1,861 0.23 32,246 -4.80 0.0038
2015-08-13 2015-06-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 815,082 -15,269 -1.84 33,873 19.93 0.0036
2015-05-15 2015-03-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 830,351 99,046 13.54 28,243 32.47 0.0029
2015-02-11 2014-12-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 731,305 34,328 4.93 21,321 22.64 0.0021
2014-11-12 2014-09-30 13F/A-1 INTERACTIVE BROKERS GROUP Common equity shares 45841N107 696,977 -67,145 -8.79 17,385 -2.29 0.0019
2014-11-10 2014-09-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 696,977 17,385
2014-08-12 2014-06-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 764,122 -30,284 -3.81 17,793 3.35 0.0019
2014-05-15 2014-03-31 13F/A-1 INTERACTIVE BROKERS GROUP Common equity shares 45841N107 794,406 83,378 11.73 17,217 -0.54 0.0020
2014-05-13 2014-03-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 794,406 17,217
2014-02-06 2013-12-31 13F/A-1 INTERACTIVE BROKERS GROUP Common equity shares 45841N107 711,028 -130,433 -15.50 17,310 9.58 0.0019
2014-02-06 2013-12-31 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 847,256 11,593
2013-11-12 2013-09-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 841,461 -31,929 -3.66 15,797 13.26 0.0019
2013-08-08 2013-06-30 13F INTERACTIVE BROKERS GROUP Common equity shares 45841N107 873,390 873,390 13,947 0.0018
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.