Celsius Holdings Inc. shares tumbled after the energy drink maker reported second-quarter revenue that missed Wall Street expectations, signaling intensifying competition in the functional beverage space.

The company's namesake Celsius brand saw sales decline as rivals gained shelf space and consumer attention. Revenue fell short of analyst estimates, prompting a sharp selloff in CELH stock.

Management cited increased promotional activity from competitors and shifting retailer preferences as key headwinds. The energy drink category remains crowded with new entrants pressuring pricing and margins.

Investors are watching for signs of stabilization in the coming quarters, particularly whether Celsius can regain momentum through innovation and distribution expansion.