Roblox up on announcing first-ever share repurchase program
** Videogame platform Roblox's RBLX.N shares rise 4.4% to $46.40 in trading after the bell ** RBLX announces first-ever share repurchase program of up to $3 billion ** Roblox plans to buy back up to $1 billion of its common stock over the next 12 months ** Stock has fallen 45% YTD (Reporting by Juby Babu in Mexico City) ((Juby.Babu@thomsonreuters.com;))