Combined assets of the five biggest (SPY, IVV, QQQ, VTI, IWM) run to a quarter of a trillion dollars.

FORBES: Dumb Idea: Investors Are Fleeing Stocks

Among the largest underlying components of IVV, in trading today Microsoft Corporation ( MSFT) is up about 0.1%, and General Electric Company ( GE) is lower by about 1.2%.

FORBES: Investors Turn Bullish Despite Debt Concerns

Among the largest underlying components of IVV, in trading today Qualcomm, Inc. ( NASD: QCOM) is down about 0.1%, Schlumberger Ltd. ( NYSE: SLB) is up about 1.1%, and Amazon.com Inc. ( NASD: AMZN) is lower by about 0.7%.

FORBES: Noteworthy ETF Inflows: IVV, QCOM, SLB, AMZN