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What: Shares of 21Vianet (Nasdaq: VNET) tanked by as much as 11% today after the company reported second-quarter earnings results below expectations.

So what: The company, which is the largest carrier-neutral Internet data center services provider in China, posted revenue of $57.4 million, a gain of 58.2% from a year ago. That translated into a net profit of $2.9 million, compared to a net loss in the same quarter last year.

Now what: That bottom line was only about half of what analysts were looking for, though. Additionally, 21Vianet's revenue was also on the low end of its guidance for the quarter. CEO Josh Chen said the company achieved a new milestone with the opening of its new self-built data centers, although these did not come online until the end of June. 21Vianet met its revenue guidance, but just barely.

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