New NYSE chairwoman served from 2014 to 2017 as a commissioner at the Commodity Futures Trading Commission overseeing futures markets.
A rally fueled by social media users has left established funds reeling under losses.
China's warning comes after New York Stock Exchange's statement that it would delist China Telecom Corp Ltd, China Mobile Ltd and China Unicom Hong Kong Ltd.
Investors rode out another turbulent day on Wall Street that kept stock indexes flipping between gains and losses until a late-day bounce gave the market a modest gain.
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