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.