Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership454,970 shares
Latest Disclosed Value $ 29,259,121
Alliancebernstein L.p. reports 6.54% decrease in ownership of IBKR / Interactive Brokers Group, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 454,970 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $29,259,121 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 486,821 shares of Interactive Brokers Group, Inc.. This represents a change in shares of -6.54% 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 454,970 -31,851 -6.54 29,259 -6.54 0.0079
2026-02-17 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 486,821 -12,589 -2.52 31,307 -8.90 0.0099
2025-11-14 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 499,410 -103,567 -17.18 34,364 2.86 0.0108
2025-08-14 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 602,977 463,212 331.42 33,411 44.36 0.0109
2025-05-15 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 139,765 -11,552 -7.63 23,144 -13.43 0.0084
2025-02-12 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 151,317 -5,263 -3.36 26,733 22.52 0.0091
2024-11-14 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 156,580 13,449 9.40 21,821 24.35 0.0073
2024-08-14 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 143,131 -5,105 -3.44 17,548 5.97 0.0061
2024-05-14 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 148,236 -15,993 -9.74 16,559 21.63 0.0059
2024-02-14 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 164,229 -4,457 -2.64 13,615 -6.76 0.0052
2023-11-14 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 168,686 -75,104 -30.81 14,601 -27.90 0.0062
2023-08-15 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 243,790 6,326 2.66 20,252 3.30 0.0083
2023-05-15 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 237,464 16 0.01 19,605 14.12 0.0084
2023-02-15 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 237,448 90,752 61.86 17,179 83.24 0.0077
2022-11-15 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 146,696 14,635 11.08 9,375 29.04 0.0045
2022-08-15 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 132,061 -90,970 -40.79 7,265 -50.58 0.0033
2022-05-13 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 223,031 93,354 71.99 14,700 42.73 0.0057
2022-02-14 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 129,677 245 0.19 10,299 27.64 0.0036
2021-11-10 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 129,432 5,209 4.19 8,069 -1.18 0.0032
2021-07-30 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 124,223 -340 -0.27 8,165 -10.26 0.0033
2021-05-06 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 124,563 1,633 1.33 9,098 21.48 0.0040
2021-02-08 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 122,930 -540 -0.44 7,489 25.51 0.0035
2020-11-12 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 123,470 150 0.12 5,967 15.84 0.0032
2020-08-13 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 123,320 -3,590 -2.83 5,151 -5.99 0.0030
2020-05-14 2020-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 126,910 -660 -0.52 5,479 -7.87 0.0039
2020-02-18 2019-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 127,570 3,160 2.54 5,947 -11.12 0.0034
2019-11-14 2019-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 124,410 -150 -0.12 6,691 -0.89 0.0042
2019-08-14 2019-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 124,560 50 0.04 6,751 4.50 0.0042
2019-05-14 2019-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 124,510 -20 -0.02 6,460 -5.08 0.0042
2019-02-13 2018-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 124,530 85,143 216.17 6,806 212.49 0.0051
2018-11-08 2018-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 39,387 -480 -1.20 2,178 -15.19 0.0014
2018-08-13 2018-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 39,867 2,800 7.55 2,568 3.05 0.0018
2018-05-14 2018-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 37,067 -410 -1.09 2,492 12.30 0.0018
2018-02-13 2017-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 37,477 2,473 7.06 2,219 40.71 0.0016
2017-11-13 2017-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 35,004 500 1.45 1,577 22.15 0.0012
2017-08-10 2017-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 34,504 196 0.57 1,291 8.40 0.0010
2017-05-11 2017-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 34,308 -1,480 -4.14 1,191 -8.88 0.0009
2017-02-13 2016-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 35,788 -816 -2.23 1,307 1.24 0.0011
2016-11-10 2016-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 36,604 -450 -1.21 1,291 -1.60 0.0011
2016-08-11 2016-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 37,054 1,150 3.20 1,312 -7.08 0.0011
2016-05-13 2016-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 35,904 -110 -0.31 1,412 -10.06 0.0012
2016-02-16 2015-12-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 36,014 -37,054 -50.71 1,570 -45.56 0.0013
2016-02-12 2015-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 36,014 1,421
2015-11-13 2015-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 73,068 -45,790 -38.52 2,884 -41.62 0.0025
2015-08-14 2015-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 118,858 82,274 224.89 4,940 296.79 0.0041
2015-05-13 2015-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 36,584 -6,200 -14.49 1,245 -0.24 0.0010
2015-02-13 2014-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 42,784 0 0.00 1,248 16.96 0.0010
2014-11-13 2014-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 42,784 0 0.00 1,067 7.13 0.0009
2014-08-13 2014-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 42,784 2,909 7.30 996 15.28 0.0008
2014-05-13 2014-03-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 39,875 -81,409 -67.12 864 -70.73 0.0007
2014-02-13 2013-12-31 13F INTERACTIVE BROKERS GROUP COM 45841N107 121,284 73,947 156.21 2,952 232.06 0.0026
2013-11-14 2013-09-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 47,337 6,300 15.35 889 35.73 0.0009
2013-08-13 2013-06-30 13F INTERACTIVE BROKERS GROUP COM 45841N107 41,037 41,037 655 0.0007
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.