Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionBrevan Howard Capital Management LP
Latest Disclosed Ownership113,946 shares
Latest Disclosed Value $ 7,642,358
Brevan Howard Capital Management LP reports 1,122.86% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On May 15, 2026 - Brevan Howard Capital Management LP filed a 13F-HR form disclosing ownership of 113,946 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $7,642,358 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,318 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 1,122.86% 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)
2026-05-15 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 113,946 104,628 1,122.86 7,642 1,175.79 0.0514
2026-02-17 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 9,318 -34,778 -78.87 599 -80.26 0.0065
2025-11-14 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 44,096 -61,090 -58.08 3,034 -47.94 0.0135
2025-08-14 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 105,186 92,778 747.73 5,828 183.74 0.0337
2025-05-15 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 12,408 -55,209 -81.65 2,055 -82.80 0.0198
2025-02-14 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 67,617 67,617 11,946 0.0768
2024-11-14 2024-09-30 13F INTERACTIVE BROKERS GRO-CL A COM CL A 45841N107 0 -3,639 -100.00 0 -100.00
2024-08-14 2024-06-30 13F INTERACTIVE BROKERS GRO-CL A COM CL A 45841N107 3,639 3,639 446 0.0040
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.