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 fuel cell product maker Plug Power (PLUG -13.87%) jumped as much as 16.7% this morning after presenting guidance for 2014 at a conference.

So what: Management said it will ship over 3,000 units to 20 manufacturing and distribution sites this year and generate $70 million in revenue. They also see 25% gross margin this year and expect to break even on an EBITDA basis before the end of the year.  

Now what: The growth isn't a huge surprise, but it still exceeds the $65 million estimate analysts had put for the company. But keep in mind that even $70 million in revenue means that Plug Power is trading at 9 times revenue, a huge multiple even for a growth stock. It's that multiple and the fact that Plug Power still isn't profitable that will keep me out of the stock until I see even more bottom-line progress.