Interactive Brokers Group, Inc.
MX ˙ BMV ˙ US45841N1072
SecurityMX:IBKR / Interactive Brokers Group, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership85,766 shares
Latest Disclosed Value $ 5,751,564
Janus Henderson Group Plc reports 7.89% increase in ownership of IBKR / Interactive Brokers Group, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 85,766 shares of Interactive Brokers Group, Inc. (MX:IBKR) valued at $5,751,564 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 79,492 shares of Interactive Brokers Group, Inc.. This represents a change in shares of 7.89% 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)
2026-05-18 2026-03-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 85,766 6,274 7.89 5,752 12.50 0.0010
2026-05-15 2026-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 85,766 6,274 5,752 0.0011
2026-02-17 2025-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 79,492 919 1.17 5,113 -5.44 0.0023
2025-11-14 2025-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 78,573 26,121 49.80 5,407 86.03 0.0025
2025-08-14 2025-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 52,452 42,353 419.38 2,906 74.74 0.0014
2025-05-15 2025-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 10,099 -44,716 -81.58 1,663 -82.82 0.0009
2025-02-14 2024-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 54,815 -15,428 -21.96 9,681 -1.10 0.0049
2024-11-14 2024-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 70,243 -4,073 -5.48 9,789 7.44 0.0050
2024-08-14 2024-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 74,316 -34,661 -31.81 9,112 -25.15 0.0049
2024-05-15 2024-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 108,977 9,858 9.95 12,173 48.14 0.0066
2024-02-14 2023-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 99,119 7,802 8.54 8,218 3.97 0.0049
2023-11-14 2023-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 91,317 23,338 34.33 7,903 39.95 0.0052
2023-08-14 2023-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 67,979 9,977 17.20 5,647 17.97 0.0035
2023-05-15 2023-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 58,002 29,220 101.52 4,788 130.03 0.0032
2023-02-14 2022-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 28,782 2,983 11.56 2,082 26.20 0.0015
2023-01-13 2022-09-30 13F/A-1 INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 25,799 783 3.13 1,649 19.84 0.0012
2022-11-14 2022-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 25,799 783 1,649 0.0004
2022-08-15 2022-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 25,016 3,611 16.87 1,376 -2.48 0.0009
2022-05-16 2022-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 21,405 -26,857 -55.65 1,411 -63.19 0.0007
2022-02-14 2021-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 48,262 9,547 24.66 3,833 58.85 0.0016
2021-11-16 2021-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 38,715 34,881 909.78 2,413 857.54 0.0011
2021-08-16 2021-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 3,834 3,834 252 0.0001
2021-05-17 2021-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -50,830 -100.00 0 -100.00
2021-02-16 2020-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 50,830 -5,878 -10.37 3,097 12.99 0.0014
2020-11-16 2020-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 56,708 -556 -0.97 2,741 14.59 0.0014
2020-08-14 2020-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 57,264 57,264 0.98 2,392 -12.73 0.0013
2020-05-14 2020-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 0 -8,748 -100.00 0 -100.00
2020-02-18 2019-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 8,748 -12,295 -58.43 408 -63.96 0.0002
2019-11-14 2019-09-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 21,043 -193 -0.91 1,132 -1.65 0.0006
2019-07-31 2019-06-30 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 21,236 -546 -2.51 1,151 1.86 0.0006
2019-04-30 2019-03-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 21,782 -8,233 -27.43 1,130 -31.10 0.0006
2019-02-06 2018-12-31 13F INTERACTIVE BROKERS GROUP IN COM CL A 45841N107 30,015 -320,785 -91.44 1,640 -91.55 0.0010
2018-11-09 2018-09-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 350,800 146,500 71.71 19,403 47.45 0.0104
2018-08-10 2018-06-30 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 204,300 76,800 60.24 13,159 53.49 0.0075
2018-05-14 2018-03-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 127,500 67,900 113.93 8,573 142.93 0.0051
2018-03-12 2017-12-31 13F/A-1 INTERACTIVE BROKERS GROUP IN COM 45841N107 59,600 59,600 3,529 0.0022
2018-02-09 2017-12-31 13F INTERACTIVE BROKERS GROUP IN COM 45841N107 59,600 3,529 0.0022
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.