Garmin is trading 19.54% down now at $250.99 after an unusually sharp August 13, 2026 after-hours decline; the cause remains unclear.
- The regular-session close was $311.96.
- No credible August 13 company-specific announcement, earnings release, guidance change, or late-breaking catalyst was found.
- The broader market moved higher, making a market-wide explanation unlikely; rechecking for delayed news is warranted.