Let's check out the Yahoo Finance charts of the day. Walmart (WMT): Shares are down in early trade, at around .41%. The world's largest retailer purchased online lingerie retailer Bare necessities. This follows its purchase earlier this month of plus-size fashion retailer Eloquii. Activision Blizzard (ATVI): Shares down here, around 4.0%. Barclays upgraded Activision to "overweight" from "equal weight" noting potential 'Call of Duty" digital revenue among the factors cited. Sears Holdings (SHLD): Shares down here, around 15.0%. The retail chain has filed for bankruptcy after it couldn't make the $134 million debt payment that was due today. it will close at least 142 more stores on top of the 46 store closings that it had already planned for next month. For more on today's big stock movers check out the Final Round, live at 3:30 p.m. ET, right here on Yahoo Finance.