Interactive Brokers Group, Inc.
US ˙ NasdaqGS ˙ US45841N1072

SecurityIBKR / Interactive Brokers Group, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership3,561,826 shares
Latest Disclosed Value $ 238,891,670
Northern Trust Corp reports 1.22% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 3,561,826 shares of Interactive Brokers Group, Inc. (US:IBKR) valued at $238,891,670 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,518,948 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 1.22% during the quarter. The current value of the position is $310,092,572 USD.

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)
2026-05-14 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,561,826 42,878 1.22 238,892 5.56 0.0065
2026-02-17 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,518,948 -41,075 -1.15 226,304 -7.62 0.0059
2025-11-14 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,560,023 -127,808 -3.47 244,965 19.88 0.0071
2025-08-13 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,687,831 2,735,059 287.06 204,343 29.52 0.0281
2025-05-13 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 952,772 76,283 8.70 157,770 1.89 0.0234
2025-02-14 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 876,489 112,500 14.73 154,849 45.44 0.0219
2024-11-13 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 763,989 -9,552 -1.23 106,470 12.27 0.0174
2024-08-14 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 773,541 91,923 13.49 94,836 24.55 0.0160
2024-05-14 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 681,618 -83,629 -10.93 76,144 20.03 0.0132
2024-02-13 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 765,247 31,552 4.30 63,439 -0.11 0.0115
2023-11-13 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 733,695 5,163 0.71 63,509 4.94 0.0123
2023-08-11 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 728,532 -5,141 -0.70 60,519 -0.09 0.0116
2023-05-15 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 733,673 4,428 0.61 60,572 14.81 0.0120
2023-02-13 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 729,245 756 0.10 52,761 13.32 0.0111
2022-11-14 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 728,489 67,835 10.27 46,557 28.11 0.0106
2022-08-12 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 660,654 7,912 1.21 36,342 -15.53 0.0078
2022-05-13 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 652,742 -7,810 -1.18 43,023 -17.99 0.0076
2022-02-08 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 660,552 -14,833 -2.20 52,460 24.60 0.0086
2021-11-15 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 675,385 19,925 3.04 42,104 -2.27 0.0075
2021-08-13 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 655,460 5,130 0.79 43,083 -9.30 0.0076
2021-05-12 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 650,330 46,367 7.68 47,500 29.10 0.0088
2021-02-11 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 603,963 12,130 2.05 36,794 28.63 0.0072
2020-11-16 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 591,833 -8,865 -1.48 28,604 14.00 0.0063
2020-08-14 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 600,698 -11,792 -1.93 25,091 -5.10 0.0059
2020-05-14 2020-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 612,490 23,120 3.92 26,440 -3.77 0.0076
2020-02-14 2019-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 589,370 10,827 1.87 27,476 -11.69 0.0061
2019-11-13 2019-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 578,543 -15,674 -2.64 31,114 -3.39 0.0074
2019-08-13 2019-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 594,217 1,104 0.19 32,206 4.66 0.0076
2019-05-13 2019-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 593,113 17,181 2.98 30,771 -2.24 0.0076
2019-02-12 2018-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 575,932 4,174 0.73 31,475 -0.47 0.0088
2018-11-14 2018-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 571,758 -233,729 -29.02 31,624 -39.05 0.0077
2018-09-18 2018-06-30 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 805,487 3,863 0.48 51,881 -3.75 0.0132
2018-08-14 2018-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 810,161 8,537 52,182
2018-05-09 2018-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 801,624 172,755 27.47 53,902 44.76 0.0140
2018-02-14 2017-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 628,869 31,339 5.24 37,235 38.35 0.0094
2017-11-13 2017-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 597,530 6,916 1.17 26,913 21.78 0.0070
2017-08-11 2017-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 590,614 8,005 1.37 22,100 9.25 0.0062
2017-05-12 2017-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 582,609 47,164 8.81 20,228 3.47 0.0058
2017-02-13 2016-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 535,445 6,072 1.15 19,549 4.70 0.0060
2016-11-09 2016-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 529,373 38,692 7.89 18,671 7.50 0.0058
2016-08-12 2016-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 490,681 17,116 3.61 17,369 -6.72 0.0056
2016-08-19 2016-03-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 473,565 -449 -0.09 18,620 -9.90 0.0062
2016-05-13 2016-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 473,565 18,620
2016-02-12 2015-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 474,014 -4,428 -0.93 20,667 9.44 0.0069
2015-11-12 2015-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 478,442 478,442 0.00 18,884 0.0063
2015-08-13 2015-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 0 -272,381 -100.00 0 -100.00
2015-05-14 2015-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 272,381 7,533 2.84 9,267 19.99 0.0028
2015-02-12 2014-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 264,848 -401 -0.15 7,723 16.70 0.0023
2014-11-13 2014-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 265,249 26,428 11.07 6,618 19.01 0.0021
2014-08-14 2014-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 238,821 2,113 0.89 5,561 8.42 0.0017
2014-05-14 2014-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 236,708 -6,651 -2.73 5,129 -13.42 0.0016
2014-02-21 2013-12-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 243,359 -4,573 -1.84 5,924 27.32 0.0019
2014-02-12 2013-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 243,359 5,924
2013-11-13 2013-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 247,932 30,617 14.09 4,653 34.05 0.0016
2013-08-09 2013-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 217,315 217,315 3,471 0.0013
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.