Company News: Wal-Mart, GameStop, Trading Firms, Adobe, Toyota, FedEx

• Not content to be the nation’s No. 1 seller of new merchandise, Wal-Mart Stores will soon accept used video games in exchange for gift cards and resell them. Used games, a $1.6 billion business in the U.S., offer fatter profit margins than new iterations at retailers such as GameStop. Creating a secondary market—and giving customers store credit that must be used at its stores—will let Wal-Mart prime sales of new merchandise.

• U.S. regulators and New York Attorney General Eric Schneiderman have launched investigations into whether high-frequency trading firms are getting an inside track from major exchanges. The officials are probing whether trading platforms give speed-focused traders discounts on fees or priority over institutional and retail investors when processing orders.