June 2, 2009 The Athens Exchange announces that in implementation of paragraph 3.1.2.6 of its Rulebook, the shares of the company PC SYSTEMS S.A. (ATHEX: PSYST), will be traded as of Tuesday, June 2nd, 2009, in the Medium & Small Capitalization Category, since as the trading session of June 1st, 2009, the closing price of the company’s shares was above the limit of euro 0.40.