VMFXX vs. CGMU

Last updated Jun 9, 2026

VMFXX (Vanguard Federal Money Market Fund) and CGMU (Capital Group Municipal Income ETF) are both funds - VMFXX is a Money Market fund managed by Vanguard, while CGMU is a Municipal Bonds fund actively managed by Capital Group. Over the past 3 years, VMFXX returned 3.35%/yr vs 4.67%/yr for CGMU. At a 0.09 correlation, their price movements are largely independent. VMFXX charges 0.11%/yr vs 0.27%/yr for CGMU.

Performance

VMFXX vs. CGMU - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Federal Money Market Fund (VMFXX) and Capital Group Municipal Income ETF (CGMU). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with VMFXX having a 1.50% return and CGMU slightly lower at 1.46%.

VMFXX

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

CGMU

• 1D: 0.07%
• 1M: 0.30%
• YTD: 1.46%
• 6M: 2.01%
• 1Y: 6.88%
• 3Y*: 4.67%
• 5Y*: —
• 10Y*: —

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

VMFXX vs. CGMU - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
VMFXX Vanguard Federal Money Market Fund	1.50%	4.24%	1.64%	4.64%	0.00%
CGMU Capital Group Municipal Income ETF	1.46%	5.19%	2.64%	6.76%	4.53%

Correlation

The correlation between VMFXX and CGMU is 0.11, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.11
Correlation (3Y) Calculated over the trailing 3-year period	0.08
Correlation (All Time) Calculated using the full available price history since Oct 28, 2022	0.09

Return for Risk

VMFXX vs. CGMU — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

CGMU

CGMU Risk / Return Rank: 79
CGMU Sharpe Ratio Rank: 93
CGMU Sortino Ratio Rank: 93
CGMU Omega Ratio Rank: 95
CGMU Calmar Ratio Rank: 61
CGMU Martin Ratio Rank: 55

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

VMFXX vs. CGMU - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Federal Money Market Fund (VMFXX) and Capital Group Municipal Income ETF (CGMU). 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.

	VMFXX	CGMU	Difference
Sharpe ratio: Return per unit of total volatility	3.67	3.02	+0.65
Sortino ratio: Return per unit of downside risk	—	4.31	—
Omega ratio: Gain probability vs. loss probability	—	1.65	—
Calmar ratio: Return relative to maximum drawdown	—	2.71	—
Martin ratio: Return relative to average drawdown	—	8.76	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VMFXX vs. CGMU - Sharpe Ratio Comparison

The current VMFXX Sharpe Ratio is 3.67, which is comparable to the CGMU Sharpe Ratio of 3.02. The chart below compares the historical Sharpe Ratios of VMFXX and CGMU, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	VMFXX	CGMU	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.67	3.02	+0.65
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	2.60	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.59	1.66	+0.93

Drawdowns

VMFXX vs. CGMU - Drawdown Comparison

The maximum VMFXX drawdown since its inception was 0.00%, smaller than the maximum CGMU drawdown of -4.11%. Use the drawdown chart below to compare losses from any high point for VMFXX and CGMU.

Drawdown Indicators

	VMFXX	CGMU	Difference
Max Drawdown Largest peak-to-trough decline	0.00%	-4.11%	+4.11%
Max Drawdown (1Y) Largest decline over 1 year	0.00%	-2.55%	+2.55%
Max Drawdown (3Y) Largest decline over 3 years	0.00%	-3.89%	+3.89%
Max Drawdown (5Y) Largest decline over 5 years	0.00%	—	—
Current Drawdown Current decline from peak	0.00%	-0.82%	+0.82%
Average Drawdown Average peak-to-trough decline	0.00%	-0.84%	+0.84%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.00%	0.79%	-0.79%

Volatility

VMFXX vs. CGMU - Volatility Comparison

The current volatility for Vanguard Federal Money Market Fund (VMFXX) is 0.30%, while Capital Group Municipal Income ETF (CGMU) has a volatility of 0.82%. This indicates that VMFXX experiences smaller price fluctuations and is considered to be less risky than CGMU based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMFXX	CGMU	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.30%	0.82%	-0.52%
Volatility (6M) Calculated over the trailing 6-month period	0.79%	1.74%	-0.95%
Volatility (1Y) Calculated over the trailing 1-year period	1.12%	2.29%	-1.17%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.94%	3.47%	-2.53%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.94%	3.47%	-2.53%

VMFXX vs. CGMU - Expense Ratio Comparison

VMFXX has a 0.11% expense ratio, which is lower than CGMU's 0.27% 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

VMFXX vs. CGMU - Dividend Comparison

VMFXX's dividend yield for the trailing twelve months is around 3.87%, more than CGMU's 3.33% yield.

Position	TTM	2025	2024	2023	2022
CGMU Capital Group Municipal Income ETF	3.33%	3.32%	3.21%	3.08%	0.49%
VMFXX Vanguard Federal Money Market Fund	3.87%	4.14%	1.63%	4.53%	0.00%

Frequently Asked Questions

Can I hold both VMFXX and CGMU in my portfolio?

VMFXX and CGMU have a correlation of 0.11, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VMFXX or CGMU?

CGMU has higher volatility (0.82%) compared to VMFXX (0.30%). In terms of maximum drawdown, VMFXX dropped 0.00% vs CGMU's -4.11%.

Which has better risk-adjusted returns?

VMFXX currently has the higher Sharpe Ratio (3.67 vs 3.02), 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.