Ultra Clean Holdings is trading 4.39% higher at $75.88, with no clear company-specific catalyst. - The company announced today that it will report third-quarter results on October 27; the announcement does not explain the gain. - A board appointment reported over the weekend is not a clear explanation for the move. - The Nasdaq is up 0.72% and the S&P 500 is up 0.38% in supplied market context; available coverage does not confirm unusually high trading activity.