SANTA CLARA, Calif.--(BUSINESS WIRE)--Citrix Systems, Inc. (NASDAQ:CTXS) today announced that its board of directors has authorized the company to repurchase up to an additional $500 million of Citrix common stock. Citrix said it plans to buy shares on the open market from time to time, depending on market conditions. About Citrix Citrix (NASDAQ:CTXS) is leading the transition to software-defining the workplace, uniting virtualization, mobility management, networking and SaaS solutions to enabl