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: Shares of OPNET Technologies (Nasdaq: OPNT) are getting destroyed today by as much as 25% after the company reported quarterly earnings last night.

So what: The network performance solution provider reported second-quarter revenue of $41.9 million, which gave way to $0.24 of earnings per share. Revenue came in short of analysts' estimates while net income was right on target with expectations.

Now what: Revenue in the third quarter is expected in the range of $44 million to $49 million, below the consensus of $47.1 million. The company's board has also approved a one-time special dividend of $0.85 per share, in addition to its $0.12 quarterly dividend. Investors are disappointed as the company also warned that it may have trouble sealing some deals in the current quarter.

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Fool contributor Evan Niu holds no position in any company mentioned. Click here to see his holdings and a short bio. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.