Interactive Brokers Group, Inc.
US ˙ NasdaqGS ˙ US45841N1072

SecurityIBKR / Interactive Brokers Group, Inc.
InstitutionNatixis
Latest Disclosed Ownership127,170 shares
Latest Disclosed Value $ 8,529,292
Natixis reports 67.17% decrease in ownership of IBKR / Interactive Brokers Group, Inc.

On May 14, 2026 - Natixis filed a 13F-HR form disclosing ownership of 127,170 shares of Interactive Brokers Group, Inc. (US:IBKR) valued at $8,529,292 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 387,409 shares of Interactive Brokers Group, Inc.. This represents a change in shares of -67.17% during the quarter. The current value of the position is $11,082,866 USD.

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)
2026-05-14 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 127,170 -260,239 -67.17 8,529 -65.77 0.0276
2026-02-13 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 387,409 300,495 345.74 24,914 316.62 0.0885
2025-11-14 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 86,914 -317,643 -78.52 5,981 -73.32 0.0277
2025-08-13 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 404,557 403,779 51,899.61 22,417 17,412.50 0.0994
2025-07-18 2025-03-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 778 778 128 0.0007
2025-05-14 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 778 778 128 0.0007
2024-05-13 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -79,217 -100.00 0 -100.00
2024-02-13 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 79,217 78,770 17,621.92 6,567 17,181.58 0.0477
2023-11-14 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 447 -142 -24.11 39 -20.83 0.0003
2023-08-11 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 589 -7,759 -92.94 49 -93.03 0.0004
2023-05-12 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 8,348 -15,303 -64.70 689 -59.73 0.0062
2023-02-24 2022-12-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 23,651 -224,801 -90.48 1,711 -89.22 0.0096
2023-02-13 2022-12-31 13F Interactive Brokers Group COM CL A 45841N107 23,199 -225,253 1,675 0.0000
2022-11-14 2022-09-30 13F Interactive Brokers Group COM CL A 45841N107 248,452 70,452 39.58 15,879 62.16 0.0743
2022-08-12 2022-06-30 13F Interactive Brokers Group COM CL A 45841N107 178,000 178,000 9,792 0.0355
2021-11-12 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -330,200 -100.00 0 -100.00
2021-08-13 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 330,200 301,400 1,046.53 21,704 931.56 0.0948
2021-05-14 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL 45841N107 28,800 28,800 2,104 0.0069
2019-02-14 2018-12-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 0 -138,927 -100.00 0 -100.00
2018-11-14 2018-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 138,927 -98,080 -41.38 7,684 -49.67 0.0444
2018-08-14 2018-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 237,007 220,437 1,330.34 15,266 1,270.38 0.0808
2018-05-15 2018-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 16,570 11,419 221.69 1,114 265.25 0.0068
2018-02-14 2017-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 5,151 5,151 305 0.0023
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.