Walmart Inc. (WMT) and Vizio Corp. (VZIO) said late Wednesday they are going to refile paperwork related to their proposed merger after the retail giant held “informal” antitrust talks with the Federal Trade Commission and the Justice Department. Walmart in a securities filing said it notified the agencies that it will withdraw and refile a premerger notification “in order to give the antitrust agencies additional time to review the proposed transaction.” The notification was originally sent on Feb. 26, and the refile is expected on Friday. Shares of Walmart were down a fraction in the extended session Wednesday, and shares of Vizio fell 1%.