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: Generac Holdings (NYSE: GNRC) is one of the few stocks moving significantly higher today, jumping 26% after releasing first-quarter earnings.

So what: Revenue more than doubled to $294.6 million and earnings rose from $4.8 million to $30.1 million, or $0.44 per share. Both results easily topped analyst estimates. To put a little cherry on top, management said it was planning a special dividend of up to $10 per share.

Now what: The dividend alone would make any stock jump, but the earnings numbers were strong as well. Management even said that the full-year revenue would be at the top end of its guidance. Shares trade at just 11 times forward earnings even after the pop in shares, and I think there's further to run with strong operations and a big return of capital to shareholders.

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