Veteran hedge fund manager dumps popular tech stock [https://www.thestreet.com/.image/t_share/MjE3MTQ5NjYzODM1MzM0MDAw/gettyimages-1240882311.jpg] Veteran hedge fund manager dumps popular tech stock Josh Mandell exits MSTR, slams Saylor for breaking promises as stock slides 7%. [https://www.thestreet.com/crypto/markets/veteran-hedge-fund-manager-dumps-popular-tech-stock]