) are higher on the session by 1.91%, currently trading at $14.39. The stock has been moving largely higher over the past three weeks and is currently trading above the 50-day moving average. Options traders are focusing on calls today. The strike seeing the heaviest volume is the January 2012 $12.50 call, which has traded 1,000 times on open interest of 2,769 contracts. Calls are outpacing puts today by 30 to 1. NuVasive, Inc. is a medical device company. NuVasive focuses on developing minimally disruptive surgical products and procedures for the spine.