Ultra Clean Holdings is trading 5.21% down at $49.50 in pre-market, apparently in line with semiconductor-equipment weakness. - Lam Research’s outlook cited supply constraints and a significant expected decline in China revenue. - No company-specific announcement explaining the decline was found; Q3 results are scheduled for October 27, not October 22. - The move also came amid broader risk-off trading, with major U.S. indices lower in the provided market context.