** Shares of video game retailer GameStop GME rise 6.5% to $27.5 after the bell

** GME says its board has approved adding bitcoin as treasury reserve asset

** Reports net income of $131.3 million for Q4, up from $63.1 million a year ago

** GME posts Q4 net sales of $1.28 billion vs estimate of $1.48 billion, according to data compiled by LSEG

** Up to last close, stock had fallen ~19% YTD