This excerpt taken from the PCG 10-K filed Feb 24, 2009.
SRSP Aggressive Asset Allocation Fund is a pre-mixed portfolio of commingled stock and bond funds. The Fund will invest approximately 55% in U.S. Large Cap Equities, 20% in Fixed Income Securities, 10% in U.S. Small Cap Equities, and 15% in International Equities. The underlying funds are managed by State Street Global Advisors (SSgA). These funds are combined and rebalanced daily by Fidelity Management Trust Company on direction from PG&E Corporation.