What happened A10 Networks (NYSE: ATEN) stock is getting crushed today, down by 19% as of 11:40 a.m. EDT, after the company announced preliminary second-quarter results. So what Revenue in the second quarter should come in at $52.5 million to $53.5 million, which is well below the company's prior guidance of $62 million to $64 million in sales. A10 Networks expects to post a non-GAAP net loss of $0.05 to $0.06 per share, also below prior guidance of an adjusted profit of $0.01 to $0.03 per share. Image source: Getty Images. Analysts were expecting the company to post revenue of $62.8 million and non-GAAP earnings per share of $0.02. Now what "We are disappointed with our preliminary results. Revenue came in below our guidance as a number of opportunities in our pipeline did not close primarily in North America and to a lesser degree in Japan. Key deals remain in our pipeline and we are diligently working to improve our execution," said CEO Lee Chen in a statement. "We remain confident that our investments in security and cloud will serve as a strong foundation to penetrate these faster-growing segments of our market." A10 will release full results on July 27. 10 stocks we like better than A10 NetworksWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the 10 best stocks for investors to buy right now... and A10 Networks wasn't one of them! That's right -- they think these 10 stocks are even better buys. Click here to learn about these picks! *Stock Advisor returns as of July 6, 2017Evan Niu, CFA has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.