Tachibana Aaron 4

What Happened
Aaron Tachibana, Personalis’ CFO and COO, exercised stock options to acquire a total of 51,251 shares (28,832 shares at $9.16 and 22,419 shares at $5.32; total exercise cost $383,370) and sold those 51,251 shares in an open‑market transaction for a weighted average price of $13.18, generating proceeds of $675,488. The transactions occurred on 2026-06-26 and appear to be part of a pre-established trading plan.

Key Details

• Transaction date: 2026-06-26.
• Option exercises (code M): 28,832 shares @ $9.16 (acquired for $264,101) and 22,419 shares @ $5.32 (acquired for $119,269).
• Open‑market sale (code S): 51,251 shares sold for weighted avg $13.18, proceeds $675,488; sale price ranged $13.00–$13.30.
• The filing also reports corresponding derivative disposals at $0, which reflect the exercise/conversion reporting of the options (a technical reporting detail).
• Shares owned after the transactions: not disclosed in this Form 4.
• Footnotes: Transactions were executed under a Rule 10b5‑1 trading plan adopted August 7, 2025; the options exercised were fully vested and exercisable.

Context
Because the exercised shares were sold the same day in the open market under a 10b5‑1 plan, this functions like a cashless exercise followed by an immediate sale and is generally considered routine insider liquidity rather than a direct bullish purchase signal. The 10b5‑1 plan and same‑day sale reduce ambiguity about timing and intent; the filing was made on the same date as the transactions.