LOS ANGELES - A 10-year-old San Antonio boy made a killing by selling GameStop stock he was gifted more than a year ago.Jaydyn Carr's mother, Nina, spent $60 for 10 shares of the video game chain's stock in December of 2019 that she gave him for Kwanzaa to reflect Ujamaa, one of the festival's seven principles that focuses on cooperative economics.With GameStop's share price skyrocketing this week behind a speculative frenzy driven by a Reddit chat group, Jaydyn sold the shares Wednesday for a little less than $3,200, the San Antonio Express-News reported.Trading volume has surged in shares of GameStop, AMC Entertainment, as well as Bed Bath & Beyond and BlackBerry, stunning Wall Street firms betting that those stocks would fall."My phone.