FormFactor CEO Mike Slessor Sells 4,735 Shares Under Rule 10b5-1 Trading Plan

This Form 4 filing reports that Mike Slessor, CEO and Director of FormFactor Inc (FORM), sold 4,735 shares of common stock on July 15, 2026, through six separate transactions at prices ranging from $116.56 to $121.30 per share. The sales were executed automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025. Following these transactions, Slessor's direct ownership decreased from approximately 434,106 shares to 430,412 shares. The filing includes detailed footnotes providing weighted average sale prices and price ranges for each transaction, with the reporting person undertaking to provide full information regarding the number of shares sold at each separate price upon request by the SEC or security holders.