Monolithic Power Systems is trading 4.24% lower at $1322.13 as investors reduce exposure to semiconductor and high-growth technology shares. - The decline follows a sharp rally, including an 8.06% gain on September 22. - The Nasdaq Composite is down 0.80% and the S&P 500 is down 0.44%; rising crude oil and Treasury yields are pressuring equity valuations. - No new company-specific catalyst was identified; recent GlobalFoundries news predates September 23.