Monolithic Power Systems is trading 6.09% down now in after-hours trading at $1143.64 after closing September 18, 2026, at $1217.80; no confirmed company-specific catalyst directly explains the decline.

  • Recent coverage focused on the September 9 GlobalFoundries manufacturing agreement and September 10 dividend announcement.
  • The next expected earnings release is October 29, 2026.
  • The broader market was positive, so the move appears stock-specific but remains unexplained.