What happened
Shares of Pinduoduo (PDD 3.35%) tumbled on Wednesday after the Chinese e-commerce company reported its third-quarter results. Pinduoduo missed analyst estimates across the board, sending the stock down 21.8% by 12:35 p.m. EST.
So what
Pinduoduo reported third-quarter revenue of $1.05 billion, up 123% year over year but $30 million below the average analyst estimate. Gross merchandise value for the trailing-12-month period was $117.5 billion, up 144% year over year.

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"We celebrated our fourth anniversary in early October with an annual active buyer base exceeding half a billion for the twelve-month period ended September 30, 2019," said Pinduoduo CEO Zheng Huang.
Non-GAAP (adjusted) earnings per American depositary share came in at a loss of $0.20, missing analyst estimates by $0.13. Heavy spending beat down the bottom line, with sales and marketing expense eating up 92% of total revenue.
Now what
While Pinduoduo is growing sales at a brisk pace, the company is paying a high price for that growth. With both revenue and earnings coming in below expectations, a sizable chunk of the stock's recent rally was erased on Wednesday.