You might like roller coaster rides, but probably not when the roller coaster is a stock (unless you get on and off at just the right time -- and we all know that's pretty tricky).

Novavax (NASDAQ: NVAX) has offered investors just such a ride over the past few years. The stock soared more than 2,700% in 2020 but dropped nearly 93% last year. Initial gains came as investors bet on Novavax's chances of bringing a coronavirus vaccine to market; declines occurred after the vaccine entered the market later than rival products did.

Now, as we start a new year, you might be wondering what to do about Novavax. Should you buy the shares after their big decline and bet on recovery? Or is it time to sell -- or avoid -- this biotech stock? Let's check out one reason to buy and two reasons to sell.

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Source Fool.com