Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership28,658 shares
Latest Disclosed Value $ 1,922,093
Quadrant Capital Group Llc reports 2.07% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 28,658 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $1,922,093 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 28,078 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 2.07% 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)
2026-05-13 2026-03-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 28,658 580 2.07 1,922 6.48 0.0575
2026-05-11 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 28,658 580 49 0.0369
2026-02-12 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 28,078 -126 -0.45 1,806 -6.96 0.0546
2025-11-13 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 28,204 278 1.00 1,941 25.40 0.0631
2025-08-13 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 27,926 21,009 303.73 1,547 35.11 0.0557
2025-05-13 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 6,917 4,078 143.64 1,145 128.54 0.0425
2025-02-13 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,839 73 2.64 502 30.13 0.0345
2024-11-12 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,766 -196 -6.62 385 6.06 0.0268
2024-08-12 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,962 584 24.56 363 36.98 0.0270
2024-05-15 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,378 157 7.07 266 44.02 0.0210
2024-02-08 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,221 -58 -2.54 184 -6.60 0.0158
2023-11-14 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,279 554 32.12 197 37.76 0.0198
2023-08-10 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,725 109 6.75 143 7.52 0.0142
2023-05-11 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,616 352 27.85 133 46.15 0.0139
2023-02-13 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,264 192 17.91 91 31.88 0.0104
2022-11-10 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 1,072 329 44.28 69 68.29 0.0091
2022-08-09 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 743 478 180.38 41 127.78 0.0055
2022-05-06 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 265 81 44.02 18 20.00 0.0022
2022-02-01 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 184 0 0.00 15 36.36 0.0018
2021-11-12 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 184 0 0.00 11 -8.33 0.0015
2021-08-09 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 184 -59 -24.28 12 -33.33 0.0017
2021-05-12 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 243 59 32.07 18 63.64 0.0029
2021-02-16 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 184 0 0.00 11 22.22 0.0020
2020-11-13 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 184 0 0.00 9 12.50 0.0020
2020-08-13 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 184 -126 -40.65 8 -38.46 0.0018
2020-05-15 2020-03-31 13F Interactive Brokers Group Com 45841N107 310 61 24.50 13 18.18 0.0022
2020-03-19 2019-12-31 13F/A-1 Interactive Brokers Group Com 45841N107 249 0 0.00 11 -8.33 0.0013
2020-02-03 2019-12-31 13F Interactive Brokers Group Com 45841N107 249 0 11 37.1704
2019-10-24 2019-09-30 13F Interactive Brokers Group COM 45841N107 249 0 0.00 12 0.00 0.0018
2019-07-24 2019-06-30 13F Interactive Brokers Group COM 45841N107 249 0 0.00 12 9.09 0.0019
2019-04-29 2019-03-31 13F Interactive Brokers Group COM 45841N107 249 -60 -19.42 11 -26.67 0.0019
2019-01-17 2018-12-31 13F Interactive Brokers Group COM 45841N107 309 60 24.10 15 25.00 0.0040
2018-10-29 2018-09-30 13F Interactive Brokers Group COM 45841N107 249 0 0.00 12 -14.29 0.0034
2018-08-08 2018-06-30 13F Interactive Brokers Group COM 45841N107 249 0 0.00 14 -12.50 0.0049
2018-05-10 2018-03-31 13F Interactive Brokers Group COM 45841N107 249 0 0.00 16 23.08 0.0058
2018-01-31 2017-12-31 13F Interactive Brokers Group COM 45841N107 249 0 0.00 13 30.00 0.0052
2017-10-13 2017-09-30 13F Interactive Brokers Group COM 45841N107 249 45 22.06 10 66.67 0.0041
2017-08-14 2017-06-30 13F Interactive Brokers Group COM 45841N107 204 -15 -6.85 6 0.00 0.0027
2017-04-10 2017-03-31 13F Interactive Brokers Group COM 45841N107 219 0 0.00 6 0.00 0.0026
2017-01-11 2016-12-31 13F Interactive Brokers Group COM 45841N107 219 -105 -32.41 6 -40.00 0.0030
2016-10-25 2016-09-30 13F Interactive Brokers Group COM 45841N107 324 -30 -8.47 10 -9.09 0.0065
2016-07-28 2016-06-30 13F Interactive Brokers Group COM 45841N107 354 0 0.00 11 -15.38 0.0076
2016-04-27 2016-03-31 13F Interactive Brokers Group COM 45841N107 354 301 567.92 13 550.00 0.0084
2016-01-28 2015-12-31 13F Interactive Brokers Group COM 45841N107 53 -20 -27.40 2 0.00 0.0014
2015-10-28 2015-09-30 13F Interactive Brokers Group COM 45841N107 73 0 0.00 2 0.00 0.0014
2015-08-12 2015-06-30 13F Interactive Brokers Group COM 45841N107 73 73 2 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.