AT&T Inc.’s T shares gained 1.5% after activist investor Paul Singer’s Elliott Management revealed that it acquired a stake worth $3.2 billion in the telecom giant’s stock.Alcoa Corp. AA surged 6.2% after announcing its restructuring plan to get rid of its business unit structure and consolidate sales, procurement and other activities at enterprise level.Amgen Inc.’s AMGN shares tumbled 2.6% after declaring disappointing data of Phase 1 study result of its cancer drug AMG 510.Shares of The Boeing Co. BA declined 1.2% after suspending load testing of its new 777X aircraft following a cargo door’s failure to clear a ground stress test.Want 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 AT&T Inc. (T): Free Stock Analysis Report The Boeing Company (BA): Free Stock Analysis Report Amgen Inc. (AMGN): Free Stock Analysis Report Alcoa Corp. (AA): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research