🔴 Ideaya Biosciences is trading 21.3% down in after-hours trading with no clear company-specific catalyst identified

Ideaya Biosciences is trading 21.3% down in after-hours trading at $30.23 after closing at $38.41 on September 18, 2026; no clear company-specific catalyst has been identified.

• The move is sharply out of line with the broader market, as the Nasdaq Composite gained 1.09%.
• Searches found no reliable September 18 announcement, earnings release, clinical setback, financing update, or analyst action explaining the decline.
• Recent company coverage remained focused on pipeline progress and upcoming milestones.