Twitter Chief Executive Officer Jack Dorsey has stepped down from his role and a successor has been lined up, a person familiar with the matter told Reuters.
The company's board has been preparing for Dorsey's departure since last year, the source said.
The news comes as Twitter has accelerated the pace of its product innovation over the past year to compete with social media rivals such as Facebook Inc and TikTok, and to reach its goal of doubling annual revenue by 2023.
Twitter was not immediately available for comment.
Shares of the microblogging platform surged 9% in early trading, while those of digital payments firm Square Inc, of which Dorsey is also chief executive, were up 3%.
Trading in the shares was then suspended ahead of an expected announcement.
Taking to Twitter, Dorsey announced that he has decided that it's finally time to leave.
"After almost 16 years of having a role at our company... from co-founder to CEO to Chair to Exec to Interim-CEO to CEO... I decided it's finally time to leave," he said.