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.