It's official: K2M Group Holdings Inc.'s $1.4 billion sale to Kalamazoo, Michigan-based Stryker Corp. has closed. Under the deal, Leesburg-based K2M, a 300-person spinal surgery device maker, becomes a wholly owned subsidiary of Stryker (NYSE: SYK), a 33,000-employee Fortune 500 med-tech firm. The transaction was completed Nov. 9, according to Securities and Exchange Commission filings. The deal faced some hurdles during the process, when two lawsuits filed Oct. 11 sought to block it, alleging...