Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionMunro Partners
Latest Disclosed Ownership219,390 shares
Latest Disclosed Value $ 14,714,487
Munro Partners reports 82.24% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On May 6, 2026 - Munro Partners filed a 13F-HR form disclosing ownership of 219,390 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $14,714,487 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 120,385 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 82.24% 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)
2026-05-06 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 219,390 99,005 82.24 14,714 90.08 0.4986
2026-02-17 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 120,385 41,405 52.42 7,742 42.45 0.2011
2025-10-15 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 78,980 -7,760 -8.95 5,435 13.07 0.1473
2025-10-15 2025-06-30 13F/A-1 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 86,740 69,360 399.08 4,806 67.05 0.1495
2025-08-27 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 86,740 69,360 4,806 0.1504
2025-10-14 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 17,380 8,180 88.91 2,878 77.05 0.1346
2025-10-15 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 9,200 5,585 154.50 1,625 223.06 0.0540
2025-10-21 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,615 3,615 504 0.0184
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.