Source: GT Advanced Technologies.

The tech-heavy Nasdaq Composite index had a rough week between July 7 and July 11. The index fell 1.6%, well below the milder 0.9% drop of the broad-market indicator S&P 500.

But these three tech stocks suffered more than your average Nasdaq ticker this week.

  • IT security expert FireEye (NASDAQ:FEYE) plunged 13.7%, taking the edge off a positive two-month run.

  • Geospace Technologies (NASDAQ:GEOS), which provides seismic data tools for oil and gas producers, lost 15.6% in a weeklong tumble. The company's news wires have been very quiet lately -- maybe too quiet?

  • GT Advanced Technologies (NASDAQOTH:GTATQ) dropped 17.9%, starting with a downright brutal Monday session. The provider of sapphire screen covers for Apple's (NASDAQ:AAPL) next generation of mobile devices may already have all of its upcoming catalysts priced into the stock -- and then some.

The following slideshow will fill you in on the reasons behind these three sudden drops and prepare you for what's next.

Anders Bylund has no position in any stocks mentioned. The Motley Fool recommends Apple and Geospace Technologies and owns shares of Apple. Try any of our Foolish newsletter services free for 30 days.

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