Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionJoel Isaacson & Co., LLC
Latest Disclosed Ownership9,971 shares
Latest Disclosed Value $ 668,723
Joel Isaacson & Co., LLC reports 0.12% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On April 22, 2026 - Joel Isaacson & Co., LLC filed a 13F-HR form disclosing ownership of 9,971 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $668,723 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 9,959 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 0.12% 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)
2026-04-22 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 9,971 12 0.12 669 4.38 0.0222
2026-01-30 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 9,959 12 0.12 640 -6.43 0.0211
2025-10-30 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 9,947 12 0.12 684 24.36 0.0247
2025-07-23 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 9,935 7,455 300.60 550 34.15 0.0224
2025-04-25 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,480 79 3.29 411 -3.30 0.0186
2025-01-28 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,401 3 0.13 424 26.95 0.0191
2024-10-23 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,398 5 0.21 334 13.99 0.0159
2024-07-24 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,393 5 0.21 293 10.15 0.0154
2024-04-30 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 2,388 2,388 267 0.0146
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.