Ultra Clean (UCTT -5.1%) opens lower after warning it expects Q4 revenue of $88.5M-$90M, below...

Ultra Clean (UCTT -5.1%) opens lower after warning it expects Q4 revenue of $88.5M-$90M, below prior guidance of $94M-$99M and a consensus of $95.7M. No explanation is given for the warning, but it comes at a time when the near-term outlook for chip equipment makers has become increasingly bleak.