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 Builders FirstSource (BLDR 1.66%) jumped 11% today after the company released earnings.

So what: Sales were up 38.1% from a year ago to $402.9 million, the eighth straight quarter year-over-year growth has been over 30%. Net income swung from a loss of $13.6 million a year ago to a $12.6 million profit, or $0.13 per share.  

Now what: The company's operations are improving across the board, with gross margins up and SG&A costs down as well. If the housing market continues to improve I think the company's results will follow, although it's just barely swinging to a profit. The stock is trading at 20 times forward estimates, but management has crushed those estimates the last two quarters, which is why I think the stock still has plenty of room to run.