PPG Industries, Inc.’s PPG shares gained 4.7% after the company reported fourth quarter 2018 earnings per share of $1.15, surpassing the Zacks Consensus Estimate of $1.09 a shareSignet Jewelers Limited’s SIG shares declined 24.7% after the company lowered its adjusted EPS guidance to the range of $3.53 to $3.68, against the previous guidance of $4.15 to $4.40Shares of Amazon.com, Inc. AMZN gained 0.6% after Consumer Intelligence Research Partners Inc. stated that Amazon’s Prime membership had hit 101 million membersShares of CSX Corporation CSX declined 0.4% after the company reported fourth quarter 2018 earnings per share of $1.01, lower than the previous quarter earnings of $1.05 a shareWant the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report CSX Corporation (CSX): Free Stock Analysis Report Amazon.com, Inc. (AMZN): Get Free Report PPG Industries, Inc. (PPG): Get Free Report Signet Jewelers Limited (SIG): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research