The Nasdaq Stock Exchange on Tuesday included Pinduoduo as a constituent of the "Nasdaq 100 Index", making the Chinese e-commerce company the youngest current constituent of the index.
Pinduoduo also has the shortest time from inception to inclusion in the Nasdaq's history.
The Nasdaq 100 and S&P 500 are two of the world's most important stock indices. Members of the NASDAQ 100 have a combined market capitalization of more than $10 trillion.
Compared to the S&P 500, the Nasdaq 100 is more focused on leading the world in cutting-edge technological innovation, with nearly 60% of its companies being technology companies, and its member companies having higher growth and return on investment than the S&P 500.
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In terms of current market capitalization weighting, the top five Nasdaq 100 companies are Apple, Amazon, Microsoft, Google and Facebook, with first-time entrant Pinduoduo ranked 26th.
Baidu, JD.com, NetEase and Ctrip previously joined the Nasdaq 100 index, which does not include Alibaba because it is listed on the New York Stock Exchange.
As of Tuesday's close, Pinduoduo shares were up 4.9 percent to $87.24.
