On a tough day for the major averages Friday, Sector Leader Lannett Company (LCI) held its own. Lannett makes generic thyroid, cardiovascular and pain-management drugs. It’s no stranger to fast growth, and the company has made it abundantly clear it’s on the lookout for acquisitions to fuel continued growth. In early February, the company reported quarterly profit, excluding one-time charges, of $1.21 a share, up 163% from a year ago.