Summary
Updated Aug 31, 2026
Thomas Peterffy is Chairman of Interactive Brokers Group, Inc. (IBKR). 1 SEC Form 4 filing on record, dated 2 October 2024.
Recent Transactions
1Every recent SEC Form 4 transaction Thomas Peterffy has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Thomas Peterffy go back to 2024: 1 primary Form 4 filing, an average of 0.3 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Thomas Peterffy files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Paul Jonathan Brody - $59.13M of IBKR open-market activity in the last 12 months
- Earl H. Nemser - $11.76M of IBKR open-market activity in the last 12 months
- Lawrence E. Harris - $5.77M of IBKR open-market activity in the last 12 months
- Jill Bright - $26K of IBKR open-market activity in the last 12 months
- Lori A. Conkling - $16K of IBKR open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Thomas Peterffy?
Thomas Peterffy is a corporate insider, tracked as Chairman of Interactive Brokers Group, Inc. (IBKR). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Thomas Peterffy last file a Form 4?
The only primary Form 4 on record is dated 2 October 2024.
Where can I see all of Thomas Peterffy's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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