Meme stocks are back.

One day after an account associated with the phenomenon posted for the first time in years on the X social media platform, shares in companies that have been linked to speculative trading activity are soaring in value.

Leading the way is video game retailer GameStop, whose shares soared 74% in Monday trading to about $30 and were up another 93% in Tuesday morning trading before the opening bell.

Other stocks rallying at eye-watering rates include AMC Entertainment…