Don't believe the adage to "sell in May and go away." Buying stocks can still be a smart move, especially if you're a long-term investor.

Three Motley Fool contributors have identified stocks they think are no-brainers to buy in May. Here's why they picked Eli Lilly (NYSE: LLY), (NYSE: PFE), and Vertex Pharmaceuticals (NASDAQ: VRTX).

Prosper Junior Bakiny (Eli Lilly): What makes a stock a no-brainer? Excellent financial results, a competitive advantage, or a long runway for growth? The answer is all of those things and more. And Eli Lilly, one of the world's largest healthcare companies, is outstanding in all three categories. In the first quarter, the company's revenue grew by 26% year over year to $8.8 billion, a fantastic performance for a pharmaceutical giant.

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Source Fool.com