If you go to California's Redwood National Park, you can see the world's tallest tree -- a redwood called Hyperion that's over 380 feet tall. Like every other tree, though, Hyperion started as a small seed.

Stocks can be like this, beginning small but growing to a giant size over time. Three Motley Fool contributors think they've found some monster stocks in the making you can buy right now. Here's why they picked (NASDAQ: ALT), Axsome Therapeutics (NASDAQ: AXSM), and Viking Therapeutics (NASDAQ: VKTX).

David Jagielski (Altimmune): Altimmune is a clinical-stage biopharmaceutical company with a modest market cap, but it has an exciting drug in its portfolio that could soon make it a hot buy with investors. The company has a glucagon-like peptide 1 (GLP-1) treatment, pemvidutide, which has been generating some encouraging results in clinical trials.

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Source Fool.com