Shares of Chewy rose 15% premarket on Monday, before reversing sharply, after a filing showed Keith Gill, the stock influencer known as “Roaring Kitty”, had picked up a 6.6% stake in the pet products e-retailer. The turbulent rally comes days after the investor, known for triggering the meme-stock rally of 2021, posted an uncaptioned picture of a puppy on the social media platform X that briefly sent Chewy shares to a near one-year high on Thursday. Shortly after the New York Stock Exchange opened on Monday ...