Key TakeawaysRobinhood shares jumped more than 4% in Tuesday's extended session after the online discount brokerage firm unveiled a $1 billion stock buyback program.The company said it would repurchases the shares over a two to three year period, starting from the third quarter of this year.The stock buyback program, coupled with recent innovative offerings, position the company as a mature financial services provider, potentially helping it gain additional investment interest. Robinhood shares may encounte ...