Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Electronics miniaturization specialist Tessera Technologies (Nasdaq: TSRA) -- not to be confused with the Texas State Rifle Association -- saw its shares plunging 16.4% this morning with perhaps more losses to come.

So what: Tessera's fourth-quarter report was very strong, but guidance for the next quarter was terrible. Sales are expected to fall thanks to multiple license renewals not happening as expected, and the company is cutting as much as 15% of its workforce in order to lower costs.

Now what: The company already spends a lot of time in court trying to get license payments out of its licensees, and this spate of rebellious customers doesn't help any. Tessera should, by all rights, be having the time of its life as major customers including Intel, Samsung, and Texas Instruments are upgrading or building chip factories all over the world, but it looks like rivals Amkor Technology (Nasdaq: AMKR) and Advanced Semiconductor Engineering (NYSE: ASX) are likely to enjoy that buildout to a greater degree.

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