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: Wireless equipment providers Skyworks (Nasdaq: SWKS) and Powerwave Technologies (Nasdaq: PWAV) fell 10% today in a broad tech sell-off. NetScout (Nasdaq: NTCT), a performance-management solutions provider for VOIP and smartphones, also fell 10%.

So what: Skyworks and NetScout are due to release earnings after the bell, and investors are a little nervous after yesterday's rough earnings day. No specific news dinged either company, but F5 Networks posted weak growth expectations, leading investors to wonder whether the market's priced too much growth into certain tech stocks.

Now what: There's no reason to panic today, and tomorrow we'll know exactly where Skyworks stands. Analysts expect earnings of $0.44 and revenue of $334.04 million for the most recent quarter. The tech sell-off was largely overdone today, so if Skyworks' earnings are solid, we may see a nice bump in coming days.

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