TSP C Fund: what's actually inside it
Large-capitalisation US company stocks — the common-stock index fund. Tracks the S&P 500.
505 holdings · expense ratio 0.048% · top 10 = 36.4% · concentration score 28.7/100 · holdings as of 2026-06-30
Top 25 holdings
| # | Holding | Weight | |
|---|---|---|---|
| 1 | NVDA | 7.51% | |
| 2 | AAPL | 6.59% | |
| 3 | MSFT | 4.30% | |
| 4 | AMZN | 3.62% | |
| 5 | GOOGL | 3.25% | |
| 6 | AVGO | 2.77% | |
| 7 | GOOG | 2.59% | |
| 8 | MU | 2.02% | |
| 9 | META | 1.92% | |
| 10 | TSLA | 1.84% | |
| 11 | LLY | 1.47% | |
| 12 | AMD | 1.47% | |
| 13 | BRK-B | 1.42% | |
| 14 | JPM | 1.26% | |
| 15 | INTC | 1.02% | |
| 16 | JNJ | 0.95% | |
| 17 | AMAT | 0.89% | |
| 18 | XOM | 0.88% | |
| 19 | V | 0.87% | |
| 20 | LRCX | 0.84% | |
| 21 | WMT | 0.77% | |
| 22 | CAT | 0.76% | |
| 23 | CSCO | 0.72% | |
| 24 | ABBV | 0.69% | |
| 25 | COST | 0.64% |
Sector split
Overlap with the other TSP funds
The question a federal employee can actually act on: holding two of these, how much is the same underlying company?
| Paired with | Overlap | Effective Funds (50/50) |
|---|---|---|
| TSP I Fund | 1.0% | 2.0 |
| TSP S Fund | 0.2% | 2.0 |
| TSP F Fund | 0.2% | 2.0 |
Frequently asked
What does the TSP C Fund actually hold?
The C Fund tracks the S&P 500. The Thrift Savings Plan does not publish a holdings list and does not file SEC form N-PORT, so this page shows the 505 positions of VOO, which tracks the same index, as of 2026-06-30. The largest position is NVDA at 7.5%, and the top ten are 36.4% of the fund.
Is this the TSP's real holdings data?
No, and that distinction matters. It is a labelled proxy: a different fund tracking the same index, not the C Fund itself. VOO tracks the same index, so its published holdings are the closest available picture of what the C Fund owns. Index funds tracking the same benchmark hold nearly identical portfolios, so the picture is close — but the weights are VOO's, not the TSP's, and the TSP has never published its own.
How much do the TSP funds overlap each other?
The C Fund overlaps the I Fund 1.0% by weight — I Fund 1.0%, S Fund 0.2%, F Fund 0.2%. Overlap is the sum of the smaller weight in each fund over every holding both own, computed from the proxy holdings described above.
Why isn't the G Fund shown?
The G Fund is deliberately absent. It holds non-marketable US Treasury securities issued only to the TSP, which are not traded anywhere and have no market equivalent. Showing it through a bond fund would misrepresent an instrument whose defining feature is that its principal cannot fall.
Most federal employees hold more than the TSP
A TSP account is rarely the whole picture — there is often an IRA, a spouse's 401(k), or a brokerage account alongside it. Paste them all together to see the real overlap between your C Fund and everything else you own, and your own Effective Funds number. Free, no account, nothing stored.
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Compare it directly
TSP C Fund shown via VOO, holdings as of 2026-06-30. The TSP publishes no holdings of its own. Weights are fractions of the fund. Diagnostics, not advice.