One of the internet’s most-followed investors — the leader of the “meme stock” movement — revealed on Monday that he had bought up shares of the online pet retailer Chewy.

The company’s stock price rose more than 11% in early Monday trading after Keith Gill, known online by his handle “Roaring Kitty,” revealed he had taken a significant stake in the company.

Gill had foreshadowed the Chewy holdings in a post on X last week that was simply a dog emoji.