"...The Thrift Savings Plan reported Tuesday that its most popular investment option, a fund of special-issue government securities called the G fund, gained 2.45 percent for the just-ended calendar year, while a fund that tracks the Standard & Poor’s 500 index of large U.S. company stocks, called the C fund, rose 2.11 percent.
The G fund held about 45 percent of investor assets while the C fund held 23 percent through November, the latest month for which participant figures are available..."
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