June delivered mixed results for Thrift Savings Plan (TSP) investors, highlighting the difference between large-company and small-company stocks. The S Fund turned in its strongest monthly performance of the year, while the C Fund paused after two exceptional months of gains. Meanwhile, the I Fund finished essentially unchanged.
S Fund Leads the Way
The S Fund was June’s top performer, gaining 4.34%, its strongest monthly return of 2026. Small and mid-sized companies benefited from a broader market rally as investors expanded beyond the largest technology stocks into a wider range of industries. Expectations that interest rates could eventually move lower also helped support smaller companies.
With June’s advance, the S Fund has now posted three consecutive monthly gains and leads all core TSP stock funds for the year, returning 18.41% through June 30.
C Fund Pulls Back After Strong Gains
After impressive performances in April and May, the C Fund took a modest step back in June, declining 0.95%. While any negative month can draw attention, the decline followed gains of 10.49% in April and 5.26% in May, making June’s pullback relatively modest in the broader context.
Even with the decline, the C Fund remains up 10.20% year-to-date and has returned 22.31% over the past 12 months. June reflected a shift in investor attention toward smaller companies after several months in which many of the market’s largest stocks led the way.
I Fund Finishes Nearly Unchanged
The I Fund slipped just 0.03% in June, ending the month essentially flat. International markets saw gains earlier in the month before giving some of them back as global markets experienced increased volatility and currency movements weighed on returns.
Despite the quiet month, the I Fund continues to post impressive longer-term performance. It remains the top-performing core TSP fund over the past 12 months with a return of 30.05%, while its year-to-date gain stands at 16.53%.
G and F Funds Continue Providing Stability
The fixed-income funds continued to provide steady returns during June. The G Fund gained 0.37%, continuing its long history of preserving principal while earning interest. The F Fund added 0.25% as bond markets remained relatively stable amid expectations that the Federal Reserve will continue monitoring inflation and economic conditions before making any changes to interest rates.
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% |
A Strong Finish to the Second Quarter
Although June’s returns varied across the stock funds, the second quarter was exceptionally strong overall for TSP investors. The C Fund gained 15.20% during the quarter, the S Fund surged 19.88%, and the I Fund returned 14.42% as markets rebounded sharply following April’s recovery.
Looking Ahead
Investors will continue watching the Federal Reserve for signals about the timing of future interest rate decisions. Expectations that rates could eventually move lower have generally supported stock prices, while any indication that rates may remain elevated for longer could lead to additional market volatility.
International markets will also be influenced by the strength of the U.S. dollar, global economic conditions, and ongoing geopolitical developments.
While monthly returns can vary significantly, they are a normal part of long-term investing. For federal employees with diversified TSP portfolios and long investment horizons, maintaining focus on long-term goals is generally more important than reacting to any single month’s performance.
A Federal Retirement Consultant (FRC®) can help you determine whether your current TSP allocation aligns with your retirement goals, time horizon, and comfort with investment risk. There is no cost and no obligation.
