An improved operating performance from Sigma-Aldrich (SIAL) prompts S&P to upgrade its...

|About: Sigma-Aldrich Corporation (SIAL)|By:, SA News Editor

An improved operating performance from Sigma-Aldrich (SIAL) prompts S&P to upgrade its credit rating to single-A-plus with a stable outlook. "We anticipate that management will be prudent in the manner in which it executes its plans for bolt-on acquisitions and shareholder rewards."