Activist investor Starboard Value has built an over 9% stake in Tripadvisor after the online travel-review company eschewed takeover offers in the past year, according to people familiar with the matter.

Activist investor Starboard Value has built an over 9% stake in online travel firm Tripadvisor , a person familiar with the matter said on Wednesday.

Tripadvisor shares jumped 10% after Starboard Value revealed a more than 9% stake in the online travel company, according to a securities filing.