Envision Healthcare Holdings Inc. (NYSE: EVHC) and AmSurg Corp. (Nasdaq: AMSG) agreed to merge in an all-stock deal that will create a super-sized U.S. provider of physicians and health-care services with a combined enterprise value of $15 billion.

Envision’s investors will own about 53 percent of the combined firm, which will be called Envision Healthcare Corp. The exchange ratio is 0.334 AmSurg shares for each Envision share, the companies said in a statement. That implies a valuation of $25.89 for Envision, or about $4.8 billion, based on AmSurg’s closing price on Wednesday.

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