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 energy service provider Wlllbros Group (NYSE:WG) gained as much as 25% today after being upgraded by an analyst.

So what: Analysts at Johnson Rice upgraded shares after a strong earnings report and the stock went crazy. The fiscal fourth quarter numbers were good earlier this week with sales jumping a whopping 58% to $573.1 million, way ahead of the consensus estimate of $485.7 million, and $0.09 in earnings per share topping estimates of $0.06.  

Now what: The earnings report barely moved the stock yesterday, but an analyst sent volume to nearly four times its normal level today. I think the quarter was surprisingly good and shares look attractively priced going forward. I'm leery of buying on an analyst-induced jump, since they don't often last, but if shares pull back next week I think investors can ride them higher over the next year.

Interested in more info on Willbros Group? Add it to your watchlist by clicking here.