If there was one clear winner inside the TSP in June, it was the S Fund. Small and mid-cap stocks surged 4.34% during the month, the fund’s strongest single-month return of the year, as investor enthusiasm expanded beyond the largest technology companies into a broader range of industries. The S Fund has now gained ground in three consecutive months and leads all core stock funds for 2026 with an 18.41% year-to-date return.
The C Fund had a quieter month, pulling back 0.95% after gaining more than 15% combined in April and May. Viewed in that context, the June dip looks more like a natural pause than a cause for concern. The fund remains up 10.20% for the year and 22.31% over the trailing 12 months.
The I Fund was nearly a non-event in June, slipping just 0.03%. International markets gained ground early in the month before giving some of it back as currency movements and global volatility weighed on returns. Even with the flat month, the I Fund continues to lead all core funds over the trailing 12 months with a 30.05% gain.
The G Fund and F Fund did what they always do — provided steady, positive returns with no drama. The G Fund gained 0.37% and the F Fund added 0.25%, continuing to serve their role as the stability anchors in a diversified TSP portfolio.
June 2026 TSP Performance
TSP Fund
June Return
YTD Return
12-Month Return
G Fund
+0.37%
+2.18%
+4.40%
F Fund
+0.25%
+0.74%
+3.83%
C Fund
-0.95%
+10.20%
+22.31%
S Fund
+4.34%
+18.41%
+29.16%
I Fund
-0.03%
+16.53%
+30.05%
L Income
+0.30%
+5.24%
+10.08%
Zooming out, the second quarter as a whole was exceptional. The C Fund gained 15.20% for the quarter, the S Fund surged 19.88%, and the I Fund returned 14.42% — all driven by April’s broad-based market recovery.
The Federal Reserve’s next moves on interest rates will likely shape TSP performance in the months ahead. Lower rates tend to support stock prices; any indication that rates will stay elevated longer could introduce additional volatility. International markets will continue to be influenced by dollar strength, global economic conditions, and geopolitical developments.
Monthly variation is a normal feature of long-term investing. For federal employees focused on retirement, the overall trajectory matters far more than any single month’s results.
A Federal Retirement Consultant (FRC®) can help you evaluate whether your current TSP allocation fits your retirement timeline and risk tolerance. No cost. No obligation.
