Celsius Holdings rises after Rockstar Energy founder builds stake, CNBC reports

** Shares of energy drink maker Celsius Holdings (CELH.O) were up 10% at $26.23.

** Rockstar Energy founder Russ Savage is pressuring Celsius and calling for the replacement of its CEO, CNBC reports.

** Savage told CNBC he would be willing to take over as CEO of Celsius.

** CELH's current leadership had lost credibility with investors, Savage said.

** He currently holds more than 12 million Celsius shares, or about 4.7% of the company, he told CNBC.

** On Thursday, the company reported quarterly results that missed Wall Street estimates.

** As of the last close, the stock was down 42% year to date.