VMFXX vs. VOO

Last updated Apr 2, 2026

Compare and contrast key facts about Vanguard Federal Money Market Fund (VMFXX) and Vanguard S&P 500 ETF (VOO).

VMFXX is managed by Vanguard. It was launched on Sep 1, 2010. VOO is a passively managed fund by Vanguard that tracks the performance of the S&P 500 Index. It was launched on Sep 7, 2010.

Performance

VMFXX vs. VOO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Federal Money Market Fund (VMFXX) and Vanguard S&P 500 ETF (VOO). The values are adjusted to include any dividend payments, if applicable.

VMFXX vs. VOO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
VMFXX Vanguard Federal Money Market Fund	0.59%	4.24%	1.64%	4.64%	0.00%	0.00%
VOO Vanguard S&P 500 ETF	-3.66%	17.82%	24.98%	26.32%	-18.17%	14.72%

Returns By Period

In the year-to-date period, VMFXX achieves a 0.59% return, which is significantly higher than VOO's -3.66% return.

VMFXX

• 1D: 0.00%
• 1M: 0.00%
• YTD: 0.59%
• 6M: 1.58%
• 1Y: 3.75%
• 3Y*: 3.32%
• 5Y*: —
• 10Y*: —

VOO

• 1D: 0.79%
• 1M: -4.29%
• YTD: -3.66%
• 6M: -1.41%
• 1Y: 18.17%
• 3Y*: 18.58%
• 5Y*: 11.93%
• 10Y*: 14.14%

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

VMFXX vs. VOO - Expense Ratio Comparison

VMFXX has a 0.00% expense ratio, which is lower than VOO's 0.03% 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%.

VOO

Vanguard S&P 500 ETF

VMFXX

Vanguard Federal Money Market Fund

Return for Risk

VMFXX vs. VOO — Risk / Return Rank

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

VOO

VOO Risk / Return Rank: 60
VOO Sharpe Ratio Rank: 54
VOO Sortino Ratio Rank: 57
VOO Omega Ratio Rank: 61
VOO Calmar Ratio Rank: 59
VOO Martin Ratio Rank: 69

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. VOO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Federal Money Market Fund (VMFXX) and Vanguard S&P 500 ETF (VOO). 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	VOO	Difference
Sharpe ratio Return per unit of total volatility	3.51	1.01	+2.50
Sortino ratio Return per unit of downside risk	—	1.53	—
Omega ratio Gain probability vs. loss probability	—	1.23	—
Calmar ratio Return relative to maximum drawdown	—	1.55	—
Martin ratio Return relative to average drawdown	—	7.31	—
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. VOO - Sharpe Ratio Comparison

The current VMFXX Sharpe Ratio is 3.51, which is higher than the VOO Sharpe Ratio of 1.01. The chart below compares the historical Sharpe Ratios of VMFXX and VOO, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	VMFXX	VOO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.51	1.01	+2.50
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.71	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.79	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.52	0.83	+1.68

Correlation

The correlation between VMFXX and VOO is 0.03, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

VMFXX vs. VOO - Dividend Comparison

VMFXX's dividend yield for the trailing twelve months is around 3.68%, more than VOO's 1.18% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
VMFXX Vanguard Federal Money Market Fund	3.68%	4.14%	1.63%	4.53%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
VOO Vanguard S&P 500 ETF	1.18%	1.13%	1.24%	1.46%	1.69%	1.25%	1.54%	1.88%	2.06%	1.78%	2.02%	2.10%

Drawdowns

VMFXX vs. VOO - Drawdown Comparison

The maximum VMFXX drawdown since its inception was 0.00%, smaller than the maximum VOO drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for VMFXX and VOO.

Drawdown Indicators

	VMFXX	VOO	Difference
Max Drawdown Largest peak-to-trough decline	0.00%	-33.99%	+33.99%
Max Drawdown (1Y) Largest decline over 1 year	0.00%	-11.98%	+11.98%
Max Drawdown (5Y) Largest decline over 5 years	—	-24.52%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-33.99%	—
Current Drawdown Current decline from peak	0.00%	-5.55%	+5.55%
Average Drawdown Average peak-to-trough decline	0.00%	-3.72%	+3.72%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.00%	2.55%	-2.55%

Volatility

VMFXX vs. VOO - Volatility Comparison

The current volatility for Vanguard Federal Money Market Fund (VMFXX) is 0.00%, while Vanguard S&P 500 ETF (VOO) has a volatility of 5.34%. This indicates that VMFXX experiences smaller price fluctuations and is considered to be less risky than VOO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMFXX	VOO	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.00%	5.34%	-5.34%
Volatility (6M) Calculated over the trailing 6-month period	0.77%	9.47%	-8.70%
Volatility (1Y) Calculated over the trailing 1-year period	1.16%	18.11%	-16.95%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.93%	16.82%	-15.89%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.93%	17.99%	-17.06%