The international stock index I fund was the big winner among Thrift Savings Plan funds in April. Its monthly return was 4.16%. That also leaves it as the highest year-to-date, at an even 9%. The government securities G fund and fixed income investment F fund both also showed positive returns last month, at 0.35% and 0.39 percent, respectively. Meanwhile, the common stock index C fund and small cap stock index S fund - both tied to major stock indexes - stayed in the red in April, and have negative year-to-date returns. All lifecycle fund returns were positive.

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