Shares of Signet Jewelers Limited SIG plunged 20.2% after generating weaker full-year earnings outlook and announcing a restructuring planfor the next three yearsMongoDB, Inc’s MDB shares jumped 7.4% after reporting fiscal fourth quarter revenues of $45 million, outpacing the Zacks Consensus Estimate of $42 millionShares of Prudential plc PUK increased 5.6% after the company split its international and European business into two different companiesCaleres, Inc’s CAL shares climbed 10.6% after posting fourth quarter earnings of $0.48 per share, beating the Zacks Consensus Estimate of $0.44Want 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 Prudential Public Limited Company (PUK): Free Stock Analysis Report Signet Jewelers Limited (SIG): Free Stock Analysis Report Caleres, Inc. (CAL): Free Stock Analysis Report MongoDB, Inc. (MDB): Free Stock Analysis Report To read this article on Zacks.com click here.