 Shares of PGE Corp. PCG, -2.70 jumped 4.2 in premarket trading Monday, after the California-based utility was added to the SP 500 index SPX, -1.72 , a little more than two years after emerging from bankruptcy. Late Friday, SP Dow Jones Indices said PGE would replace Citrix Systems Inc. CTXS, -0.06 in the benchmark index, as Citrix is being acquired by Vista Equity Partners in a deal expected to be completed on Sept. 