TSP C Fund Performance 2026
+10.20% YTD through June 2026. Tracks the S&P 500. Expense ratio: 0.059%.
Returns source: TSP.gov share-price history and fund performance pages · Data through June 2026
C Fund at a glance (2026)
Core metrics for the Common Stock Index Investment Fund.
C Fund monthly returns — 2026
Monthly returns computed from official TSP.gov share prices.
| Month | C Fund Return | Notes |
|---|---|---|
| January 2026 | +1.45% | Source: TSP.gov share prices |
| February 2026 | -0.76% | Source: TSP.gov share prices |
| March 2026 | -4.98% | Source: TSP.gov share prices |
| April 2026 | +10.49% | Source: TSP.gov share prices |
| May 2026 | +5.26% | Source: TSP.gov share prices |
| June 2026 | -0.95% | Source: TSP.gov share prices |
| July 2026 | — | Not yet reported |
| YTD through June 2026 | +10.20% | Through 2026-06-30 |
Sources: FedTools compilation of TSP.gov share prices (https://www.tsp.gov/fund-performance/share-price-history/). See the June 2026 TSP returns post for FedTools monthly analysis.
What the C Fund tracks
The C Fund tracks the S&P 500 index — the 500 largest U.S. companies by market capitalization. These include Apple, Microsoft, NVIDIA, Amazon, Meta, Alphabet, and other large-cap stocks. The C Fund is one of the most widely held TSP funds and has historically delivered strong long-term returns, though with significant year-to-year volatility.
- Index trackedS&P 500
- Expense ratio0.059% (59 basis points) — FY2025 figure
- Risk profileHigh
- Appropriate forLong-term investors (10+ year horizon) seeking equity growth. Most appropriate for younger federal employees with time t
- Key riskMarket (equity) risk — the C Fund can lose 30–50% in a severe bear market (as in 2008–2009). Year-to-year returns are hi
C Fund longer-term returns (approximate)
Annualized figures based on TSP Annual Report data. These are approximate — verify at tsp.gov/fund-performance.
| Period | Approx. Annualized Return |
|---|---|
| 2025 (full calendar year) | +17.85% |
| 3-year annualized (through 2025) | +8.00% |
| 5-year annualized (through 2025) | +14.50% |
| 10-year annualized (through 2025) | +13.20% |
Important: Past performance does not guarantee future results. Longer-term figures are approximate from TSP Annual Report and fund performance disclosures; verify at tsp.gov before making investment decisions. This page is not investment advice.
Compare all TSP core funds — 2026 YTD
How the C Fund ranks against the other four core TSP funds through June 2026.
| Fund | YTD 2026 | Index tracked | Risk |
|---|---|---|---|
| S Fund | +18.41% | Dow Jones U.S. Completion Total Sto… | Very High |
| I Fund | +16.53% | MSCI ACWI IMI ex USA ex China ex Ho… | High |
| C Fund← this fund | +10.20% | S&P 500 | High |
| G Fund | +2.18% | U.S. Treasury securities (statutory… | Very Low |
| F Fund | +0.74% | Bloomberg U.S. Aggregate Bond Index | Low to Moderate |
FedTools 2026 compilation of TSP.gov share prices through 2026-06-30.
C Fund — frequently asked questions
What did the TSP C Fund return year-to-date in 2026?
The TSP C Fund returned +10.20% year-to-date through 2026-06-30. The fund tracks the S&P 500. See the monthly returns table above for a full breakdown.
What does the TSP C Fund invest in?
The C Fund tracks the S&P 500 index — the 500 largest U.S. companies by market capitalization. These include Apple, Microsoft, NVIDIA, Amazon, Meta, Alphabet, and other large-cap stocks. The C Fund is one of the most widely held TSP funds and has historically delivered strong long-term returns, though with significant year-to-year volatility.
What is the expense ratio for the TSP C Fund?
The TSP administrative expense ratio is 0.059% (0.59 basis points), one of the lowest expense ratios of any retirement plan in the United States. This applies to all five core TSP funds — the G, F, C, S, and I funds share the same TSP administrative cost pool. By comparison, a typical mutual fund charges 0.5–1.5%. Source: TSP Administrative Expenses, published at https://www.tsp.gov/fund-performance/expense-ratio.html
Who should invest in the TSP C Fund?
Long-term investors (10+ year horizon) seeking equity growth. Most appropriate for younger federal employees with time to weather market downturns. Often the largest component in a diversified TSP allocation. The C Fund has a High risk profile. Market (equity) risk — the C Fund can lose 30–50% in a severe bear market (as in 2008–2009). Year-to-year returns are highly variable. No guarantee of principal.
Browse all TSP core funds
Monthly returns, expense ratio, and allocation guidance for every TSP core fund.
Investment Disclaimer: TSP fund returns are based on FedTools' compilation of official TSP.gov share prices and secondary sources. Past performance does not guarantee future results. This page is for informational purposes only and does not constitute investment advice. For personalized guidance, consult a financial advisor. Verify all figures at tsp.gov.