"Tripadvisor increases by more than 13%, it is reported that activist investors hold over 9% of the company's shares."

Online travel company Tripadvisor rose more than 13%, closing at $16.945. In terms of news, there is information indicating that activist investor Starboard Value has established more than 9% stake in Tripadvisor, with a total value of about $160 million. The Tripadvisor board of directors formed a special committee early last year to explore options including a possible sale.