IBKR — INTERACTIVE BROKERS GROUP IN

Ownership history in Lansing Management LP  ·  14 quarters on record

This page tracks every 13F SEC filing in which Lansing Management LP reported a position in INTERACTIVE BROKERS GROUP IN (IBKR). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.

Peak position
18.08% (2024 Q2)
Avg. % of fund
11.24%
First filed
2018 Q4
Last filed
2025 Q4
Quarters held
14
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 REDUCED 299,485 -38,500 -11.4% 12.79% $19.3M $64.24
2025 Q3 REDUCED 337,985 -61,751 -15.4% 16.87% $23.3M $68.65
2025 Q2 ADDED 399,736 +299,802 +300.0% 15.18% $22.1M $55.21
2025 Q1 REDUCED 99,934 -6,625 -6.2% 13.89% $16.5M $41.19
10 older quarters hidden  —  Sign in free or upgrade to Premium to see full history
% of Fund (quarterly)    IBKR price (monthly, adj. close)

Other funds also holding IBKR

As of 2025 Q4 — sorted by position size

Hengistbury Investment Partners LLP 3Y 7Y 32.8% Oakcliff Capital Partners, LP 3Y 7Y 28.42% Greenwich Wealth Management LLC 3Y 7Y 26.35% Ancient Art, L.P. 3Y 7Y 23.91% Systrade AG 3Y 19.62% BROOKTREE CAPITAL MANAGEMENT 3Y 17.14% RV Capital AG 3Y 7Y 11.27% Bronte Capital Management Pty Ltd. 3Y 7Y 9.53% Progeny 3, Inc. 3Y 7Y 7.37% Crocodile Capital Partners GmbH 3Y 7.2%
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