Latticework
← All portfoliosLatticework shows what 76 well-known investors report to the SEC each quarter.

IBKR · Interactive Brokers Gro (Class A) · Form 13F filings for Q2 2026

Interactive Brokers Gro (Class A)

7 of 76 investors hold it

Together they reported $1.0 billion of it. In Q2 2026, 2 added and 3 reduced.

20 of 83 tracked investors have filed for Q3 2026 so far. The sheet and every stock page stay on Q2 2026 until most have filed, so each count is taken from one group of investors.

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Who added and who reduced

Q2 2026 against Q1 2026, among 74 filings that can be compared. An investor counts as adding or reducing when reported shares change by 20% or more, or when a position is opened or closed.

2added or opened

Stephen MandelNew positionViking Global Investors+246%

3reduced or sold out

William Von Mueffling−95.4%John Armitage−34.2%Robert Vinall−26.0%

Who holds it

InvestorShare of their portfolioReported valueThis quarter
Bryan Lawrence33.42%$90MNo change of 20%
Robert Vinall12.76%$49M−26.0%
William Von Mueffling6.78%$45M−95.4%
John Armitage3.47%$359M−34.2%
Viking Global Investors1.20%$420M+246%
Stephen Mandel0.31%$50MNew position
Joel Greenblatt0.02%$10MNo change of 20%

Holders over time

How many of the same 76 investors reported a position at each quarter end, up to Q2 2026.

5Q3 ’24
5Q4 ’24
5Q1 ’25
5Q2 ’25
5Q3 ’25
5Q4 ’25
6Q1 ’26
7Q2 ’26

Where to next

Viking Global InvestorsLargest holder by dollars: $420M →Bryan LawrenceHighest conviction: 33.42% of the portfolio →All portfoliosThe biggest bets reported for Q2 2026, on one sheet →

Source: SEC Form 13F filings for Q2 2026, the quarter ended Jun 30, 2026, from the 76 investors on the homepage sheet · CUSIP 45841N107 · data as of Nov 12, 2026. Weight is the share of the investor’s disclosed portfolio. Filings list long US-listed positions at quarter end. They are not live holdings, omit shorts, can be amended and give no reasons for a change.

Each investor’s filing