Image source: Hortonworks. What: Shares of Hortonworks (NASDAQ: HDP) plunged on Friday following the release of the company's second-quarter report. The software maker missed analyst estimates on all fronts and lowered its guidance for the year, sending the stock down 28% by noon. So what: Hortonworks reported second-quarter revenue of $43.6 million, up 46% year over year but about $1.6 million shy of the average analyst estimate. Operating billings rose 49% to $62.2 million, while deferred revenue jumped 64% year over year. Non-GAAP EPS came in at a loss of $0.72, up from a loss of $0.82 during the prior-year period, but $0.04 worse than analysts were expecting. On a GAAP basis, Hortonworks lost $64.2 million, or $1.12 per share. That compares to a loss of $1.01 per share during the second quarter of 2015. In addition to falling short of expectations for the second quarter, Hortonworks lowered its full-year guidance. The company now expects to produce revenue of $177 million, down from previous guidance of $190 million. HDP data by YCharts. Now what: Shares of Hortonworks are now down nearly 60% year to date following Friday's plunge. The company is still growing fast, but a reduction in guidance wasn't well received by investors. Hortonworks is producing massive losses and burning through cash as it spends heavily on growth. CEO Rob Bearden pointed to the positives: "Our second-quarter performance was highlighted by strong support subscription revenue growth and a material improvement in operating cash flow. We remain focused on transforming our enterprise customers' business models while also improving our own business model." A secret billion-dollar stock opportunity The world's biggest tech company forgot to show you something, but a few Wall Street analysts and the Fool didn't miss a beat: There's a small company that's powering their brand-new gadgets and the coming revolution in technology. And we think its stock price has nearly unlimited room to run for early in-the-know investors! To be one of them, just click here.Timothy Green has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.