Ant Financial Services Group, an affiliate of Chinese e-commerce titan Alibaba, is in negotiations for funding that have reached a “critical stage” and value the company at $30 billion, news magazine Caixin reported on Monday. The report cited unidentified sources as saying China’s state-backed social security fund, Postal Savings Bank of China, and CDB Capital, an investment arm of China Development Bank, would be among the strategic investors in discussions for stakes of 5 percent, 3 percent and 3 percent respectively.