The stock market just finished a relatively uneventful week. The S&P 500 index gained 1.2%, the Dow Jones Industrials lost 0.7%, and the tech-heavy Nasdaq Composite market barometer rose 0.8%.

But some tech stocks were dealt a much tougher hand this week, and their stocks fell 15% or more.

Tableau Software (DATA) and VASCO Data Security International (OSPN 2.61%) reported strong earnings with solid guidance but still got drastic haircuts. Yelp (YELP 0.60%) kept growing but showed signs of fundamental issues with its business model.

Want to dig deeper into these unfortunate tech stocks? Can any of them roar back to full health? You'll find some answers in the following slideshow.

This $19 trillion industry could destroy the Internet
One bleeding-edge technology is about to put the World Wide Web to bed. And if you act quickly, you could be among the savvy investors who enjoy the profits from this stunning change. Experts are calling it the single largest business opportunity in the history of capitalism... The Economist is calling it "transformative"... But you'll probably just call it "how I made my millions." Don't be too late to the party -- click here for one stock to own when the Web goes dark.