U.S. Investors Pile Into Fundraising Round for Jack Ma’s Ant Financial

Ant is working to raise at least $9 billion from local and foreign investors

Investors outside China are helping to drive up the valuation of billionaire Jack Ma’s financial-technology business.

U.S.-based private equity firms General Atlantic and Silver Lake Partners are planning to invest in Hangzhou-based Ant Financial Services Group, according to people familiar with the matter.

Ant, one of China’s largest and...