An investor group led by Hospital Corp....

An investor group led by Hospital Corp. of America’s senior management has made a new, sweetened offer to buy the hospital chain for more than $3.6 billion, the Nashville-Tenn.-based company said. The new offer of $51 a share in cash and securities for all of HCA’s 70.6 million shares outstanding comes a week after a special committee of the company’s board rejected the group’s initial $47-a-share cash offer. The latest offer would pay $43 cash plus securities that the investor group valued at $8 for each HCA share.