Stocks wrapped up Thursday’s trading session mixed, as investors standby for Friday’s September labor report. Meanwhile, Dunkin Brands (DNKN) fell over 12 percent after announcing plans to close over 100 stores in the U.S. over the next 15 months. Dunkin did not disclose specific locations. The donut chain also reported a full-year outlook below analysts’ estimates. Plus, Twitter (TWTR) fell over 8 percent as investors grew impatient waiting for confirmation that co-founder Jack Dorsey will assume the CEO position. Shares spiked on Wednesday afternoon following reports that Dorsey would take the reins permanently after acting as interim chief since June. Finally, Walmart (WMT) is reportedly planning to lay off hundreds of workers at its Arkansas headquarters. TheStreet’s Scott Gamm reports from New York.