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 Greenway Medical Technologies Inc. (NYSE:GWAY) soared 18% today after private equity firm Vista Equity Partners agreed to acquire the medical software provider for $644 million.

So what: The all-cash deal values Greenway at $20.35 per share and represents a 19% premium to its closing price on Monday. Following the close of the transaction, the combined company, which will be known as Greenway Medical Technologies, will serve about 13,000 medical organizations and 100,000 providers.

Now what: Greenway expects the transaction to close in the fourth quarter of 2013.

"We are pleased to approve this agreement and look forward to completing this transaction," said Greenway founder and Chairman W. Thomas Green. "It provides substantial cash value for our stockholders, and reflects our deep commitment to drive innovation that helps health care professionals succeed and thrive in today's evolving health care landscape."

So while Greenway is likely all popped out at this point, close rivals like Allscripts and athenahealth might be worth looking into for some healthy hidden value.

Fool contributor Brian Pacampara has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. 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.