Filings (90d)
Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies William 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.
- Earl H. Nemser - $11.76M in IBKR purchases and sales in the last 12 months
- Lawrence E. Harris - $5.77M in IBKR purchases and sales in the last 12 months
- Jill Bright - $26K in IBKR purchases and sales in the last 12 months
- Lori A. Conkling - $20K in IBKR purchases and sales in the last 12 months
More insiders (A-Z)
Browse nearby insider profiles in alphabetical order.
Frequently asked questions
Who is William Peterffy?
William Peterffy is a corporate insider of Interactive Brokers Group, Inc. (IBKR). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
When did William Peterffy last file a Form 4?
The most recent primary Form 4 on record is dated 26 January 2026, one of 2 filings going back to 2026.
