Roaring Kitty raised GameStop shares for the first time in three years

Shares of AMC and Koss Corp also rose sharply.

The account Roaring Kitty posted a series of famous internet memes, including an image of a person leaning forward in a chair, which is used to indicate the growing seriousness of the situation. Roaring Kitty also posted a collection of other memes, but none of them mentioned GameStop stock or other companies.