Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionFifth Third Bancorp
Latest Disclosed Ownership318,274 shares
Latest Disclosed Value $ 21,346,622
Fifth Third Bancorp reports 67.19% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On May 1, 2026 - Fifth Third Bancorp filed a 13F-HR form disclosing ownership of 318,274 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $21,346,622 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 190,371 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 67.19% 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)
2026-05-01 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 318,274 127,903 67.19 21,347 74.37 0.0390
2026-02-02 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 190,371 27,364 16.79 12,243 9.15 0.0389
2025-11-07 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 163,007 18,574 12.86 11,217 40.15 0.0359
2025-07-15 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 144,433 76,618 112.98 8,003 -28.73 0.0277
2025-04-15 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 67,815 40,792 150.95 11,229 135.21 0.0427
2025-01-21 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 27,023 10,513 63.68 4,774 107.57 0.0173
2024-10-17 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 16,510 14,361 668.26 2,301 774.52 0.0083
2024-07-22 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,149 5 0.23 263 10.04 0.0010
2024-04-23 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,144 -703 -24.69 240 1.27 0.0009
2024-01-19 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,847 -17,600 -86.08 236 -86.66 0.0010
2023-10-31 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 20,447 -37,879 -64.94 1,770 -63.49 0.0082
2023-07-26 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 58,326 -7,315 -11.14 4,845 -10.59 0.0214
2023-04-24 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 65,641 45,715 229.42 5,419 276.06 0.0252
2023-01-25 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 19,926 19,417 3,814.73 1,442 4,266.67 0.0069
2022-10-25 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 509 146 40.22 33 65.00 0.0002
2022-08-04 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 363 -4 -1.09 20 -16.67 0.0001
2022-04-19 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 367 -14 -3.67 24 -20.00 0.0001
2022-02-01 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 381 160 72.40 30 114.29 0.0001
2021-10-15 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 221 72 48.32 14 40.00 0.0001
2021-08-06 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 149 0 0.00 10 -9.09 0.0000
2021-05-07 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 149 0 0.00 11 22.22 0.0001
2021-02-16 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 149 110 282.05 9 350.00 0.0000
2020-11-09 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 39 39 2 0.0000
2016-05-13 2016-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 0 -161 -100.00 0 -100.00
2016-02-16 2015-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 161 3 1.90 7 16.67 0.0001
2015-11-13 2015-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 158 52 49.06 6 50.00 0.0001
2015-08-14 2015-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 106 2 1.92 4 0.00 0.0000
2015-05-14 2015-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 104 104 0.00 4 0.0000
2014-11-17 2014-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 0 -4 -100.00 0 0.0000
2014-08-14 2014-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 4 4 0 0.0000
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.