VMRXX vs. VMFXX

Last updated Jun 19, 2026

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

Performance

VMRXX vs. VMFXX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Cash Reserves Federal Money Market Fund Admiral Shares (VMRXX) and Vanguard Federal Money Market Fund (VMFXX). 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 VMRXX at 1.50% and VMFXX at 1.50%.

VMRXX

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

VMFXX

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

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

VMRXX vs. VMFXX - Yearly Performance Comparison

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

Correlation

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

Return for Risk

VMRXX vs. VMFXX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Cash Reserves Federal Money Market Fund Admiral Shares (VMRXX) and Vanguard Federal Money Market Fund (VMFXX). 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.

	VMRXX	VMFXX	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	—	—	—

VMRXX vs. VMFXX - Sharpe Ratio Comparison

The current VMRXX Sharpe Ratio is 3.67, which is comparable to the VMFXX Sharpe Ratio of 3.67. The chart below compares the historical Sharpe Ratios of VMRXX and VMFXX, 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

VMRXX vs. VMFXX - Drawdown Comparison

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

Drawdown Indicators

	VMRXX	VMFXX	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

VMRXX vs. VMFXX - Volatility Comparison

Vanguard Cash Reserves Federal Money Market Fund Admiral Shares (VMRXX) and Vanguard Federal Money Market Fund (VMFXX) 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

	VMRXX	VMFXX	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	0.73%	0.72%	+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	1.02%	0.94%	+0.08%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.02%	0.94%	+0.08%

VMRXX vs. VMFXX - Expense Ratio Comparison

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

Dividends

VMRXX vs. VMFXX - Dividend Comparison

VMRXX's dividend yield for the trailing twelve months is around 3.88%, which matches VMFXX's 3.87% 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 VMRXX and VMFXX in my portfolio?

With a correlation of 1.00, VMRXX and VMFXX 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, VMRXX or VMFXX?

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