JP Morgan Dimon
JP Morgan CEO Jamie Dimon. Reuters

Wall Street's top CEOs, most lately Jamie Dimon of JPMorgan Chase (NYSE:JPM), have been making visits to Alibaba Co. CEO Jack Ma in China, looking to curry favor with the Internet giant ahead of its planned $15 billion IPO.

Reuters reported on Friday that Dimon met with Ma on on a trip to China this week. The visit included a handshake and they had a brief encounter, the news agency reported.

Reuters said Citigroup Inc.'s CEO Michael Corbat met with Ma last week.

Reuters estimated that underwriting fees totaling up to $260 million are at stake for the banks competing for the deal.