Inogen, Inc. (INGN) has witnessed strong momentum in the past six months period. Shares of the company have surged 46.8% compared with 1.8% growth of the industry. The S&P 500 composite has risen 10% during the same time frame. With healthy fundamentals and strong growth opportunities, this Zacks Rank #2 (Buy) company appears to be a solid wealth creator for its investors at the moment. Headquartered in Goleta, CA, Inogen develops, manufactures, and markets portable oxygen concentrators (POCs) used by patie ...