Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionQuadrature Capital Ltd
Latest Disclosed Ownership16,488 shares
Latest Disclosed Value $ 1,105,850
Quadrature Capital Ltd ownership in IBKR / Interactive Brokers Group, Inc.

On May 15, 2026 - Quadrature Capital Ltd filed a 13F-HR form disclosing ownership of 16,488 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $1,105,850 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 0 shares of Interactive Brokers Group, Inc..

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 16,488 16,488 1,106 0.0132
2026-02-17 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -58,847 -100.00 0 -100.00
2025-11-13 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 58,847 58,847 4,049 0.0479
2025-08-13 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -9,884 -100.00 0 -100.00
2025-05-13 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 9,884 -10,446 -51.38 1,637 -54.45 0.0363
2025-02-13 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 20,330 9,690 91.07 3,592 142.21 0.0720
2024-11-14 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 10,640 6,208 140.07 1,483 304.09 0.0336
2024-02-13 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 4,432 4,432 367 0.0069
2023-08-14 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -6,054 -100.00 0 -100.00
2023-05-15 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 6,054 -9,825 -61.87 500 -56.53 0.0146
2023-02-14 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 15,879 15,879 1,149 0.0356
2021-11-15 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -19,822 -100.00 0 -100.00
2021-08-16 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 19,822 19,822 1,303 0.0510
2020-08-14 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -6,137 -100.00 0 -100.00
2020-05-15 2020-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 6,137 6,137 265 0.0754
2019-02-13 2018-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 0 -22,665 -100.00 0 -100.00
2018-11-13 2018-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 22,665 -22,108 -49.38 1,254 -56.52 0.1063
2018-08-10 2018-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 44,773 44,773 97.54 2,884 129.98 0.2716
2018-02-12 2017-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 0 -6,397 -100.00 0 -100.00
2017-11-13 2017-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 6,397 6,397 288 0.0365
2017-08-14 2017-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 0 -20,151 -100.00 0 -100.00
2017-05-12 2017-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 20,151 5,901 41.41 700 34.62 0.0505
2017-04-11 2016-12-31 13F/A-3 INTERACTIVE BROKERS GROUP IN COM 45841N107 14,250 14,250 520 0.0330
2017-03-27 2016-12-31 13F/A-2 INTERACTIVE BROKERS GROUP IN COM 45841N107 14,250 0 520 0.0329
2017-03-24 2016-12-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 14,250 0 520 0.0330
2017-02-13 2016-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 203,987 23,469 1.5176
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.