Personalis CFO/COO Aaron Tachibana Exercises Options and Sells Shares Under 10b5-1 Plan

On May 29, 2026, Personalis, Inc. CFO and COO Aaron Tachibana executed a series of transactions under a Rule 10b5-1 trading plan adopted on August 7, 2025. Tachibana exercised 38,799 stock options at an exercise price of $9.16 per share, acquiring the underlying common stock. He then sold the same 38,799 shares at a weighted average price of $11.58 per share, with the sale price ranging from $11.50 to $11.71. Following these transactions, Tachibana's direct holdings decreased from 237,632 to 198,833 common shares, while his remaining stock options decreased from 107,631 to 68,832. The transactions were conducted pursuant to a pre-established trading plan, which provides an affirmative defense against insider trading allegations by allowing insiders to schedule transactions in advance.