Marriott International Inc.’s MAR shares tumbled 5.6% after the company revealed a data breach could have exposed personal information of about 500 million guestsShares of GameStop Corp. GME plunged 6.6% after reducing fiscal 2018 adjusted earnings per share guidance to $2.55-$2.75 from a range of $3.00-$3.35 projected earlierLaboratory Corporation of America Holdings LH shares plummeted 10% after posting third quarter 2018 adjusted earnings per share of $2.74, missing the Zacks Consensus Estimate of $2.87Shares of The Goldman Sachs Group Inc. GS tanked 2.1% following news that the Fed has heightened the pace of investigation into the banks involvement in controversial 1MBD sovereign-wealth fundWant 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 The Goldman Sachs Group, Inc. (GS): Free Stock Analysis Report Marriott International (MAR): Free Stock Analysis Report Laboratory Corporation of America Holdings (LH): Free Stock Analysis Report GameStop Corp. (GME): Free Stock Analysis Report To read this article on Zacks.com click here.