Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership766,485 shares
Latest Disclosed Value $ 51,408,042
Rhumbline Advisers reports 0.64% decrease in ownership of IBKR / Interactive Brokers Group, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 766,485 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $51,408,042 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 771,444 shares of Interactive Brokers Group, Inc.. This represents a change in shares of -0.64% 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)
2026-05-12 2026-03-31 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 766,485 -4,959 -0.64 51,408 3.62 0.0440
2026-02-13 2025-12-31 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 771,444 -12,433 -1.59 49,611 -8.02 0.0401
2025-11-06 2025-09-30 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 783,877 -489,645 -38.45 53,938 -23.56 0.0433
2025-08-12 2025-06-30 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 1,273,522 954,017 298.59 70,566 33.38 0.0604
2025-05-29 2025-03-31 13F/A-1 INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 319,505 38,087 13.53 52,907 6.41 0.0495
2025-04-08 2025-03-31 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 319,505 38,087 52,907 0.0495
2025-05-29 2024-12-31 13F/A-1 INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 281,418 -2,131 -0.75 49,718 25.82 0.0445
2025-01-30 2024-12-31 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 281,418 -2,131 49,718 0.0445
2024-11-12 2024-09-30 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 283,549 -81,086 -22.24 39,515 -11.61 0.0356
2024-08-01 2024-06-30 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 364,635 72,961 25.01 44,704 37.20 0.0420
2024-05-09 2024-03-31 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 291,674 -11,068 -3.66 32,583 29.82 0.0313
2024-02-08 2023-12-31 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 302,742 -6,989 -2.26 25,097 -6.39 0.0263
2023-11-09 2023-09-30 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 309,731 7,195 2.38 26,810 6.68 0.0311
2023-08-08 2023-06-30 13F INTERACTIVE BROKERS GROUP INC CL COM COM 45841N107 302,536 12,484 4.30 25,132 109,165.22 0.0282
2023-05-11 2023-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 290,052 -3,420 -1.17 24 -99.89 0.0295
2023-02-14 2022-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 293,472 12,799 4.56 21,233 18.37 0.0285
2022-11-10 2022-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 280,673 35,200 14.34 17,938 32.84 0.0267
2022-08-11 2022-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 245,473 32,751 15.40 13,503 -3.69 0.0197
2022-05-12 2022-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 212,722 6,237 3.02 14,021 -14.50 0.0180
2022-02-10 2021-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 206,485 7,695 3.87 16,399 32.32 0.0201
2021-11-12 2021-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 198,790 3,037 1.55 12,393 -3.68 0.0168
2021-08-05 2021-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 195,753 1,984 1.02 12,867 -9.09 0.0169
2021-05-06 2021-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 193,769 -1,560 -0.80 14,153 18.94 0.0192
2021-02-10 2020-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 195,329 11,996 6.54 11,899 34.30 0.0164
2020-11-12 2020-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 183,333 -2,750 -1.48 8,860 13.98 0.0139
2020-08-13 2020-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 186,083 2,378 1.29 7,773 -1.99 0.0130
2020-05-06 2020-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 183,705 3,498 1.94 7,931 -5.59 0.0166
2020-02-05 2019-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 180,207 -7,344 -3.92 8,401 -16.71 0.0140
2019-10-23 2019-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 187,551 301 0.16 10,086 -0.62 0.0184
2019-08-14 2019-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 187,250 -11,450 -5.76 10,149 -1.55 0.0191
2019-05-01 2019-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 198,700 1,327 0.67 10,309 -4.42 0.0200
2019-01-31 2018-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 197,373 52,424 36.17 10,786 34.54 0.0235
2018-11-07 2018-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 144,949 1,315 0.92 8,017 -13.34 0.0155
2018-08-06 2018-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 143,634 8,249 6.09 9,251 1.63 0.0187
2018-05-02 2018-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 135,385 -37,013 -21.47 9,103 -10.82 0.0190
2018-02-09 2017-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 172,398 53,352 44.82 10,208 90.38 0.0207
2017-11-06 2017-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 119,046 6,623 5.89 5,362 27.45 0.0117
2017-08-02 2017-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 112,423 -3,334 -2.88 4,207 4.68 0.0096
2017-05-02 2017-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 115,757 38,672 50.17 4,019 42.82 0.0094
2017-01-27 2016-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 77,085 9,117 13.41 2,814 17.40 0.0071
2016-11-08 2016-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 67,968 8,532 14.35 2,397 13.93 0.0066
2016-08-11 2016-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 59,436 8,687 17.12 2,104 5.46 0.0062
2016-05-02 2016-03-31 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 50,749 2,010 4.12 1,995 -6.12 0.0062
2016-02-03 2015-12-31 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 48,739 1,566 3.32 2,125 14.12 0.0068
2015-11-04 2015-09-30 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 47,173 2,884 6.51 1,862 1.14 0.0063
2015-08-04 2015-06-30 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 44,289 2,369 5.65 1,841 29.10 0.0059
2015-05-12 2015-03-31 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 41,920 250 0.60 1,426 17.37 0.0041
2015-02-06 2014-12-31 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 41,670 1,020 2.51 1,215 19.82 0.0035
2014-11-12 2014-09-30 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 40,650 219 0.54 1,014 7.64 0.0030
2014-08-06 2014-06-30 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 40,431 1,533 3.94 942 11.74 0.0028
2014-05-06 2014-03-31 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 38,898 -800 -2.02 843 -12.73 0.0025
2014-02-03 2013-12-31 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 39,698 -3,621 -8.36 966 18.82 0.0028
2013-11-05 2013-09-30 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 43,319 224 0.52 813 18.17 0.0025
2013-08-07 2013-06-30 13F INTERACTIVE BROKERS GRO CL A C COM 45841N107 43,095 43,095 688 0.0022
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.