Moody's has upgraded the corporate rating of Wolverine Worldwide from Ba3 to Ba2. The rating agency has indicated that Wolverine is running fewer credit risks as its net debt has fallen below $900 million, the lowest level since its acquisition of the Sperry Top-sider, Keds, Stride Rite and Saucony from Collective Brands in October 2012. Moody's has also taken into account Wolverine's new streamlining program.