VMFXX vs. VMRXX

Last updated Jun 16, 2026

VMFXX (Vanguard Federal Money Market Fund) and VMRXX (Vanguard Cash Reserves Federal Money Market Fund Admiral Shares) are both Money Market funds from Vanguard. Over the past 5 years, VMFXX returned 2.39%/yr vs 2.76%/yr for VMRXX. Their correlation of 0.91 suggests significant overlap in exposure. VMFXX charges 0.11%/yr vs 0.10%/yr for VMRXX.

Performance

VMFXX vs. VMRXX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Federal Money Market Fund (VMFXX) and Vanguard Cash Reserves Federal Money Market Fund Admiral Shares (VMRXX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

As of year-to-date, both investments have demonstrated similar returns, with VMFXX at 1.50% and VMRXX at 1.50%.

VMFXX

• 1D: 0.00%
• 1M: 0.30%
• YTD: 1.50%
• 6M: 1.82%
• 1Y: 3.95%
• 3Y*: 3.35%
• 5Y*: 2.39%
• 10Y*: —

VMRXX

• 1D: 0.00%
• 1M: 0.30%
• YTD: 1.50%
• 6M: 1.83%
• 1Y: 3.96%
• 3Y*: 3.96%
• 5Y*: 2.76%
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

VMFXX vs. VMRXX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
VMFXX Vanguard Federal Money Market Fund	1.50%	4.24%	1.64%	4.64%	0.00%	0.00%
VMRXX Vanguard Cash Reserves Federal Money Market Fund Admiral Shares	1.50%	4.25%	3.45%	4.65%	0.00%	0.01%

Correlation

The correlation between VMFXX and VMRXX is 1.00 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	1.00
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (All Time) Calculated using the full available price history since May 25, 2021	0.91

The correlation between VMFXX and VMRXX has been stable across timeframes, ranging from 0.91 to 1.00 - a consistent structural relationship.

Return for Risk

VMFXX vs. VMRXX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Federal Money Market Fund (VMFXX) and Vanguard Cash Reserves Federal Money Market Fund Admiral Shares (VMRXX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	VMFXX	VMRXX	Difference
Sharpe ratio: Return per unit of total volatility	3.67	3.67	0.00
Sortino ratio: Return per unit of downside risk	—	—	—
Omega ratio: Gain probability vs. loss probability	—	—	—
Calmar ratio: Return relative to maximum drawdown	—	—	—
Martin ratio: Return relative to average drawdown	—	—	—

VMFXX vs. VMRXX - Sharpe Ratio Comparison

The current VMFXX Sharpe Ratio is 3.67, which is comparable to the VMRXX Sharpe Ratio of 3.67. The chart below compares the historical Sharpe Ratios of VMFXX and VMRXX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

VMFXX vs. VMRXX - Drawdown Comparison

The maximum VMFXX drawdown since its inception was 0.00%, which is greater than VMRXX's maximum drawdown of 0.00%. Use the drawdown chart below to compare losses from any high point for VMFXX and VMRXX.

Drawdown Indicators

	VMFXX	VMRXX	Difference
Max Drawdown Largest peak-to-trough decline	0.00%	0.00%	0.00%
Max Drawdown (1Y) Largest decline over 1 year	0.00%	0.00%	0.00%
Max Drawdown (3Y) Largest decline over 3 years	0.00%	0.00%	0.00%
Max Drawdown (5Y) Largest decline over 5 years	0.00%	0.00%	0.00%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	0.00%	0.00%	0.00%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.00%	0.00%	0.00%

Volatility

VMFXX vs. VMRXX - Volatility Comparison

Vanguard Federal Money Market Fund (VMFXX) and Vanguard Cash Reserves Federal Money Market Fund Admiral Shares (VMRXX) have volatilities of 0.30% and 0.30%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMFXX	VMRXX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.30%	0.30%	0.00%
Volatility (6M) Calculated over the trailing 6-month period	0.72%	0.73%	-0.01%
Volatility (1Y) Calculated over the trailing 1-year period	1.12%	1.12%	0.00%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.94%	1.02%	-0.08%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.94%	1.02%	-0.08%

VMFXX vs. VMRXX - Expense Ratio Comparison

VMFXX has a 0.11% expense ratio, which is higher than VMRXX's 0.10% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

VMFXX vs. VMRXX - Dividend Comparison

VMFXX's dividend yield for the trailing twelve months is around 3.87%, which matches VMRXX's 3.88% yield.

Position	TTM	2025	2024	2023	2022	2021
VMFXX Vanguard Federal Money Market Fund	3.87%	4.14%	1.63%	4.53%	0.00%	0.00%
VMRXX Vanguard Cash Reserves Federal Money Market Fund Admiral Shares	3.88%	4.15%	3.38%	4.54%	0.00%	0.01%

Frequently Asked Questions

Can I hold both VMFXX and VMRXX in my portfolio?

With a correlation of 1.00, VMFXX and VMRXX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, VMFXX or VMRXX?

VMRXX has higher volatility (0.30%) compared to VMFXX (0.30%). In terms of maximum drawdown, VMFXX dropped 0.00% vs VMRXX's 0.00%.

Which has better risk-adjusted returns?

VMRXX currently has the higher Sharpe Ratio (3.67 vs 3.67), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.