Medtech's Big Market Movers (Tandem Diabetes Care)Medtech's Big Market Movers (Tandem Diabetes Care)

Tandem Diabetes Care went public at the end of 2013 with great fanfare. The maker of the first touchscreen insulin pump raised $138 million through its IPO.

But 2014 wasn't as kind. Last year, the San Diego company's share price dropped 51%, to $12.70 from $25.77 at the end of 2013. As a result, the company lost $252 million from its market cap.