Celsius Holdings (NASDAQ: CELH), an energy-drink maker founded in 2005, is often compared to its larger competitor Monster Beverage (NASDAQ: MNST). Celsius is a lot smaller than Monster but growing a lot faster, and it specializes in "healthier" sugar-free energy drinks that are made from natural ingredients. Celsius went public (for the second time) in 2017 and gained steam as more consumers looked for healthier alternatives to Monster and Red Bull's sugary energy drinks.