The move values Ant Financial Services Group at roughly USD 60 billion, the Wall Street Journal reported, quoting people familiar with the situation. Previous media reports had said the company aimed to raise USD 3.5 billion.
Investors included a unit of China's sovereign wealth fund and a subsidiary of China Construction Bank, one of the country's Big Four lenders, according to a statement.
Ant Financial, which is reportedly planning to go public, said it would use the funds for global expansion and boosting its services to China's rural areas.
Ant Financial, set up in 2014 to consolidate Alibaba's finance-related businesses into a single entity, includes online payments arm Alipay, which is estimated to hold 80 percent of the sector in China.
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It also includes an investment platform and an online bank, which aims to support small businesses and entrepreneurs, a key theme for Alibaba founder Jack Ma.
But the group is seeking to grow beyond its traditional online sales business, diversifying into such areas as sports and entertainment.
Alibaba listed on the New York Stock Exchange in 2014, raising USD 25 billion in the world's biggest initial public offering.
Founder Ma, who is also executive chairman, is now China's second richest person with net worth of USD 29 billion, according to Bloomberg Billionaires.