The Thrift Savings Plan's I fund continued its year-long positive run in December, posting a month over month increase of more than 3%. That, by far, was the best performing TSP fund in the final month of 2025. For the year, the I fund saw a return of more than 32%, which was more than 10% higher...
The Thrift Savings Plan's I fund continued its year-long positive run in December, posting a month over month increase of more than 3%. That, by far, was the best performing TSP fund in the final month of 2025. For the year, the I fund saw a return of more than 32%, which was more than 10% higher than any other account. Overall in December, 13 of 15 funds came back in the black. Only the F and S funds posted negative returns in December as compared to November. For the year, 12 of 15 TSP funds returned more than 11%.
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