IDEAYA Biosciences: president and CEO Hata Yujiro S exercised options for 26,338 shares

What happened

• Hata Yujiro S, president and CEO and director, exercised options to acquire 26,338 shares at $4.31 per share on Oct 6, 2026, for $113,517. On the same day he sold a total of 26,338 shares in open-market transactions: 25,538 shares at a weighted average $37.39 for $954,787 and 800 shares at a weighted average $38.26 for $30,610. The filing also reports a derivative disposition of 26,338 shares at $0.00.

Key details

• Transaction dates and prices: Oct 6, 2026 — exercised 26,338 shares @ $4.31 (acquired for $113,517); sold 25,538 shares @ $37.39 (weighted average; range $37.00 to $37.98) for $954,787; sold 800 shares @ $38.26 (weighted average; range $38.23 to $38.34) for $30,610; derivative disposition 26,338 @ $0.00.
• Shares owned after the transaction: not reported in this filing.
• Footnotes: the sales were executed under a Rule 10b5-1 plan adopted Jul 7, 2026 and the options exercised are fully vested and exercisable; the filing includes undertakings to provide trade-level details for the multiple-trade price ranges.
• Form 4 filed on Oct 8, 2026 reporting transactions dated Oct 6, 2026.

Why it may matter

• The filing shows options were exercised and the shares acquired were sold in open-market transactions the same day.
• This is an exercise and sale reported by an executive (president and CEO).
• A filing does not show why the insider traded or why the company acted.