Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionVestmark Advisory Solutions, Inc.
Latest Disclosed Ownership132,530 shares
Latest Disclosed Value $ 8,888,839
Vestmark Advisory Solutions, Inc. reports 10.34% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On May 15, 2026 - Vestmark Advisory Solutions, Inc. filed a 13F-HR form disclosing ownership of 132,530 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $8,888,839 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 120,113 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 10.34% 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 132,530 12,417 10.34 8,889 15.07 0.0611
2026-02-06 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 120,113 -2,300 -1.88 7,724 -8.30 0.1042
2025-11-10 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 122,413 -1,706 -1.37 8,423 22.48 0.1606
2025-08-06 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 124,119 45,391 57.66 6,877 -47.25 0.0993
2025-05-13 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 78,728 39,419 100.28 13,037 87.73 0.3357
2025-02-06 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 39,309 1,596 4.23 6,945 32.14 0.2391
2024-11-14 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 37,713 2,378 6.73 5,256 21.31 0.1957
2024-08-12 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 35,335 1,209 3.54 4,332 13.64 0.1809
2024-05-15 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 34,126 2,454 7.75 3,812 45.22 0.1642
2024-02-06 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 31,672 992 3.23 2,626 -1.13 0.1334
2023-11-06 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 30,680 -57,863 -65.35 2,656 -63.90 0.1930
2023-08-07 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 88,543 2,393 2.78 7,355 3.42 0.2801
2023-05-09 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 86,150 382 0.45 7,113 14.62 0.3080
2023-01-20 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 85,768 2,121 2.54 6,205 16.07 0.3023
2022-11-03 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 83,647 6,644 8.63 5,346 26.20 0.2980
2022-08-04 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 77,003 7,909 11.45 4,236 -6.98 0.2420
2022-04-27 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 69,094 1,253 1.85 4,554 -15.48 0.2578
2022-01-31 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 67,841 4,616 7.30 5,388 36.72 0.3040
2021-11-15 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 63,225 5,105 8.78 3,941 3.14 0.2669
2021-08-09 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 58,120 4,803 9.01 3,821 -1.87 0.2719
2021-05-10 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 53,317 25,320 90.44 3,894 128.25 0.3454
2021-02-04 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 27,997 2,221 8.62 1,706 36.92 0.1914
2020-10-19 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 25,776 2,906 12.71 1,246 30.47 0.1674
2020-08-13 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 22,870 3,388 17.39 955 13.56 0.1478
2020-05-06 2020-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 19,482 1,828 10.35 841 2.19 0.1644
2020-02-14 2019-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 17,654 690 4.07 823 -9.56 0.1689
2019-11-05 2019-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 16,964 2,871 20.37 910 18.03 0.1475
2019-08-20 2019-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 14,093 1,527 12.15 771 18.07 0.1319
2019-05-14 2019-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 12,566 12,566 653 0.1164
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.