Each of the portfolios in the federal government’s 401(k)-style retirement savings program increased in value in September, marking the second straight month of gains.
The large- and mid-size businesses of the Thrift Savings Plan’s C Fund had the best showing, finishing September 3.65% in the black. So far this year, the C Fund has grown 14.80%. And the international (I) fund increased 3.16% last month, bringing its 2025 performance to a TSP-best 25.34%.
The S Fund’s small- and mid-size businesses gained 2.04% in September, increasing its gains since January to 2.04%. The fixed income (F) fund grew 1.09% last month; since January, it has increased 6.14%.
The G Fund, which is made up of government securities, increased by its statutorily mandated rate of 0.35% last month. So far in 2025, the G Fund has grown 3.34%.
