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There is no mutual fund that makes your principal “safe” in the sense of guaranteed. These four funds offer different ways to limit some risks—through short-term government-backed holdings or a short-term Treasury bond strategy—but they are not interchangeable, and any can lose value. The examples below are not a ranking or personalized recommendations; match a fund to your time horizon, liquidity needs, account and ability to tolerate loss.
Four funds with different approaches to relative stability
The funds below are examples for comparison, not a definitive list of the safest mutual funds. The SEC says mutual funds are not FDIC-insured and investors can lose money. Money-market funds generally have lower risk than many other mutual funds, but remain securities rather than bank deposits.
| Fund | Approach and stated objective | Figures and qualifications | Key distinction |
|---|---|---|---|
| Vanguard Federal Money Market Fund (VMFXX) | Seeks current income, liquidity and a stable $1 net asset value (NAV). Vanguard says it invests at least 99.5% of assets in cash, government securities or qualifying government-collateralized repurchase agreements; its stated average maturity is 60 days or less. | Vanguard reported a 7-day SEC yield of 3.74% as of September 23, 2026, and an expense ratio of 0.11% as of December 19, 2025. Both are dated figures, not guarantees. | Federal-government money-market strategy; not an insured deposit. |
| Vanguard Treasury Money Market Fund (VUSXX) | Seeks current income and a stable $1 NAV. Vanguard says it invests solely in U.S. Treasury obligations and repurchase agreements fully collateralized by Treasuries. | Vanguard reported a 7-day SEC yield of 3.69% as of August 26, 2026, and an expense ratio of 0.07% as of December 19, 2025. Both are dated figures, not guarantees. | Treasury-focused money-market holdings; still a security subject to money-market fund risks. |
| Fidelity Government Money Market Fund (SPAXX) | Fidelity describes its objective as seeking current income consistent with preservation of capital and liquidity. | Current yield, expense ratio, holdings and account details: check Fidelity’s current fund information and prospectus; not stated in the cited fund information used here. | Government money-market fund. “Preservation of capital” is an objective, not a promise. |
| Vanguard Short-Term Treasury Fund (Investor Shares: VFISX; Admiral Shares: VFIRX) | The May 28, 2026 summary prospectus states an objective of current income while maintaining limited price volatility. | Current fees, duration, minimums and share-class availability: verify in the latest prospectus; not stated in the cited summary information used here. | A bond fund with a fluctuating market price, not a stable-NAV money-market fund. |
The yields and expense ratios shown are not directly comparable performance promises: yields are snapshots that can change, and the expense ratios come from a different date than the yield figures. Check each issuer’s latest fund page and prospectus before investing.
What “safe” means for these fund types
Money-market funds: cash management, not cash deposits
Money-market funds invest in liquid, short-term debt and cash equivalents. Their income tends to change as short-term interest rates move, so a yield observed today is not locked in for the future. Some funds seek to maintain a stable $1 NAV; others use a floating NAV that changes with portfolio values. A stable NAV is an aim, not a guarantee: a fund can reprice below $1 if losses or other conditions require it.
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Government-focused holdings can reduce exposure to some kinds of credit risk, but do not turn fund shares into bank deposits. The SEC’s November 4, 2024 Investor Bulletin on money-market funds explains that these funds are not FDIC-insured and investors can lose money.
Short-term Treasury bond funds: prices can still move
A short-term Treasury bond fund is not a money-market fund. Its share price reflects the market value of its bonds, and that price can fall when interest rates rise. In general, longer-maturity bond funds are more sensitive to rate changes than shorter-maturity funds. Credit quality and the fund’s maturity or duration profile also matter; the word “Treasury” does not eliminate market-price risk.
Why a short-term TIPS fund is not included
Inflation-protected Treasury securities have principal adjustments linked to inflation, but a TIPS fund’s market value can fluctuate. Vanguard’s short-term inflation-protected securities index fund profile describes an inflation-protection and income objective, but the information cited here does not establish a comparable current share class or ticker, duration, fees and other details. Without those facts, it is not a sound addition to a side-by-side list.
How to compare funds before buying
Do not choose by yield alone. Read the current prospectus and fund information, then compare the details that affect both risk and what you receive:
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- Maturity and duration: For bond funds, these help indicate sensitivity to interest-rate changes. For money-market funds, check the relevant maturity information and fund rules.
- NAV and price behavior: Determine whether a money-market fund seeks a stable or uses a floating NAV, and distinguish both from a bond fund whose share price moves with the market.
- Total costs: Compare the prospectus fee table, including expense ratio and any loads or transaction charges. Broker or intermediary costs may not appear in that table.
- Access and liquidity: Check minimums, share-class availability, settlement and redemption terms, and any limits or conditions that apply to your account.
- Tax treatment: Consider the account type and the fund’s tax characteristics; a fund suitable for one account may not be the best fit for another.
The SEC’s July 23, 2025 bulletin on mutual fund and ETF fees and Investor.gov’s mutual-fund prospectus guidance explain how to use standardized prospectus information on fees, investments, risks, performance, purchases and sales, taxes and intermediary compensation. A fund’s stated objective describes what it seeks to do; it does not guarantee a result.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When a mutual fund may not be the right place for near-term cash
If you need a bank deposit with applicable deposit insurance, a money-market mutual fund is not a substitute. If a decline in value would disrupt an imminent expense, compare the fund’s redemption and settlement terms with that deadline and consider whether market risk is appropriate at all. For longer horizons, choosing an especially conservative fund can also mean accepting less exposure to growth; the right balance depends on your circumstances rather than a universal “safe” ranking.
For any candidate, retrieve its current prospectus and shareholder reports from the issuer or SEC, and verify the latest holdings, costs, risks and redemption terms before purchasing.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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