Tachibana Aaron 4

What Happened
Aaron Tachibana, CFO and COO of Personalis, exercised 38,799 stock options (fully vested) at $9.16 per share (total cost $355,399) and sold the same 38,799 shares in an open-market transaction for a weighted average price of $11.58 per share (total proceeds ~$449,292) on May 29, 2026. The transactions were executed under a previously adopted Rule 10b5-1 trading plan.

Key Details

• Transaction date: May 29, 2026 (reported May 29, 2026).
• Option exercise: 38,799 shares exercised at $9.16 each; total exercise cost $355,399.
• Open-market sale: 38,799 shares sold at a weighted average $11.58; total proceeds ~$449,292 (sale price range $11.50–$11.71).
• Net difference (proceeds minus exercise cost): roughly $93,893 before taxes and fees.
• Shares owned after transaction: not specified in the filing excerpt provided.
• Footnotes: (F1) Sales and exercise were pursuant to a Rule 10b5-1 plan adopted Aug 7, 2025; (F2) weighted-average sale price and price range disclosed; (F3) options were fully vested and exercisable.
• Filing timeliness: Reported same day (no late filing indicated in the provided record).

Context
This was effectively a cashless exercise followed by an immediate sale of the resulting shares — a common way for insiders to exercise vested options and realize proceeds. Because the sale was made under a pre-established 10b5-1 plan, it is generally considered a pre-planned, routine transaction rather than an ad hoc trade.