Interactive Brokers Group Director Executes Small Open-Market Purchase Under Rule 10b5-1 Plan

Executive Summary

On October 1, 2026, Lori A Conkling, a Director of Interactive Brokers Group, Inc. ($IBKR), purchased 25 shares of Class A common stock at a price of $85.42 per share. The transaction was conducted directly under a pre-established Rule 10b5-1 trading plan, with an aggregate transaction value of approximately $2,135.50.

Transaction Details

• Security: Class A common stock
• Transaction Code: P (Open-market or private purchase)
• Shares Acquired: 25
• Execution Price: $85.42
• Gross Value: $2,135.50
• Post-Transaction Beneficial Ownership: 2,584 shares (inclusive of vested and unvested restricted stock units under the 2007 Stock Incentive Plan)

Market and Trading Context

Given the nominal dollar value ($2,135.50) and share quantity (25 shares), this transaction represents a minimal portfolio adjustment and carries low market significance. Furthermore, the filing indicates that the trade was executed pursuant to a Rule 10b5-1 trading arrangement, reflecting an automated schedule rather than an opportunistic open-market trade based on real-time market developments.