Shares of Envision Healthcare Corp. surged 2.5% in premarket trade Monday, after the provider of physician-led services and post-acute care said it agreed to be acquired by KKR & Co. LP in a deal valued at $9.9 billion, including debt. Under terms of the deal, KKR will pay $46 in cash for each Envision share outstanding, a 5.4% premium to Friday's closing price of $43.64. That would give Envision a market capitalization of about $5.57 billion. Envision said the deal follows a review of strategic alternatives to enhance shareholder value.