All 16 funds in the Thrift Savings Plan posted positive results in August. New data from the Federal Thrift Investment Retirement Board shows that the S fund had the largest month over month increase of just over 4%, while the I fund also continued its strong performance. Every fund is positive year-to-date with 11 funds posting double digit returns for 2025. The I fund continues to earn the biggest returns with a 21.5% gain for this year while all the L funds are seeing returns over 10% over the last eight months. 

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