MUMBAI : Sheares Healthcare, a unit of Singapore’s Temasek, has agreed to buy a controlling stake in Manipal Health Enterprises, raising its ownership from 18% to close to 59% for about ₹16,400 crore, two people with knowledge of the development said. TPG, an existing shareholder of Bangalore-based hospital chain Manipal Health Enterprises, will sell 11% of its 21% stake, valuing …