Xenok, a unit of Goldman Sachs, on Friday sold 13 million shares (4.86 per cent stake) in Max Financial Services. The shares were sold at Rs 616.47 apiece for a total of Rs 801.4 crore. According to bulk deal data provided by stock exchanges, Citigroup was among the buyers. The US-based bank picked up 1.74 million shares for Rs 107 crore. Shares of Max Financial closed at Rs 629.90, down Rs 20.85, or 3.2 per cent.