The Sterling Group, a Houston-based middle market private equity firm, completed its investment in Bad Boy, a manufacturer of high-performance zero-turn riding lawn mowers. Financial terms were not disclosed. "Phil and his team have built an incredible product and strong brand resulting in impressive growth over the last twenty years. We look forward to partnering with Phil and his team in supporting Bad Boy's future growth as it continues to deliver leading residential and commercial mowers to its loyal customer base," Kent Wallace, The Sterling Group Partner.