Though we are in a bull market, some companies are failing to keep up the pace for various reasons. For instance, medical device specialist Tandem Diabetes Care (NASDAQ: TNDM) encountered economic troubles recently, while fintech leader PayPal Holdings (NASDAQ: PYPL) dealt with slowing revenue growth and a change in leadership that may have spooked investors last year.

Both stocks have substantially lagged the market over the past 12 months. Even so, there remain good reasons to invest in PayPal and Tandem Diabetes Care.

Tandem Diabetes Care focuses on developing insulin pumps. That is an incredibly important business. The diabetes epidemic now affects more than half a billion people worldwide, according to some estimates. Insulin pumps are a convenient alternative to painful and cumbersome multiple daily injections (MDIs). Many pumps are discreet and easy to conceal. That applies to Tandem's t:slim X2, which is smaller than many competitors without sacrificing the amount of insulin it holds.

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Source Fool.com