Last year's market wasn't gloomy for every company. Investors bought certain stocks hand over fist. In most cases, these particular companies offered investors a solid reason to be optimistic about their future. And that's why they were able to defy the bear market.

I can easily think of three examples in the healthcare industry. Up-and-coming biotech Axsome Therapeutics (NASDAQ: AXSM) commercialized its first two products. Vertex Pharmaceuticals (NASDAQ: VRTX) proved to investors that it could expand beyond its core business. And AbbVie (NYSE: ABBV) -- facing declines in its biggest drug -- offered hope newer products would generate even more growth over time. Let's take a closer look at these three unstoppable stocks to keep on buying.

Axsome soared more than 100% last year. But the average Wall Street estimate calls for more than a 60% gain in the coming 12 months from today's level.

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Source Fool.com