LONDON, June 7 (Reuters) - Shares in U.S. technology giants were down slightly in premarket trading after the world’s richest nations agreed on a landmark global minimum corporate tax deal. The Group of Seven (G7) advanced economies agreed on Saturday to back a minimum global corporate tax rate of at least 15%. Shares of Facebook, Amazon.com, Apple , Microsoft and Google-parent Alphabet were all down between 0.3% and 0.6%. The G7’s proposals are seen targeting technology companies that sell services remotely and attribute much of their profits to intellectual properly held in low-tax jurisdictions. (Reporting by Thyagaraju Adinarayan and Sagarika Jaisinghani Editing by Rachel Armstrong) Our Standards: The Thomson Reuters Trust Principles.