VO vs. FSMAX

Last updated Jun 4, 2026

VO (Vanguard Mid-Cap ETF) and FSMAX (Fidelity Extended Market Index Fund) are both funds - VO is a Mid Cap Blend Equities fund tracking the CRSP US Mid Cap Index, while FSMAX is a Mid Cap Growth Equities fund managed by Fidelity. Over the past 10 years, VO returned 11.55%/yr vs 12.17%/yr for FSMAX. Their correlation of 0.95 suggests significant overlap in exposure. VO charges 0.03%/yr vs 0.04%/yr for FSMAX.

Performance

VO vs. FSMAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Mid-Cap ETF (VO) and Fidelity Extended Market Index Fund (FSMAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VO achieves a 10.05% return, which is significantly lower than FSMAX's 14.89% return. Over the past 10 years, VO has underperformed FSMAX with an annualized return of 11.55%, while FSMAX has yielded a comparatively higher 12.17% annualized return.

VO

• 1D: -0.45%
• 1M: 3.20%
• YTD: 10.05%
• 6M: 9.73%
• 1Y: 18.13%
• 3Y*: 16.69%
• 5Y*: 7.87%
• 10Y*: 11.55%

FSMAX

• 1D: 1.07%
• 1M: 5.80%
• YTD: 14.89%
• 6M: 13.61%
• 1Y: 30.08%
• 3Y*: 20.13%
• 5Y*: 6.91%
• 10Y*: 12.17%

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

VO vs. FSMAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VO Vanguard Mid-Cap ETF	10.05%	11.62%	15.31%	16.03%	-18.73%	24.70%	18.10%	30.98%	-9.24%	19.28%
FSMAX Fidelity Extended Market Index Fund	14.89%	11.40%	16.99%	25.36%	-26.44%	12.41%	32.28%	28.01%	-9.44%	18.04%

Correlation

The correlation between VO and FSMAX is 0.91, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.91
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.94
Correlation (All Time) Calculated using the full available price history since Sep 9, 2011	0.95

The correlation between VO and FSMAX has been stable across timeframes, ranging from 0.91 to 0.95 - a consistent structural relationship.

Return for Risk

VO vs. FSMAX — Risk / Return Rank

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

VO

VO Risk / Return Rank: 43
VO Sharpe Ratio Rank: 41
VO Sortino Ratio Rank: 41
VO Omega Ratio Rank: 38
VO Calmar Ratio Rank: 44
VO Martin Ratio Rank: 50

FSMAX

FSMAX Risk / Return Rank: 47
FSMAX Sharpe Ratio Rank: 41
FSMAX Sortino Ratio Rank: 39
FSMAX Omega Ratio Rank: 37
FSMAX Calmar Ratio Rank: 66
FSMAX Martin Ratio Rank: 54

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.

VO vs. FSMAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Mid-Cap ETF (VO) and Fidelity Extended Market Index Fund (FSMAX). 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.

	VO	FSMAX	Difference
Sharpe ratio: Return per unit of total volatility	1.48	1.87	-0.39
Sortino ratio: Return per unit of downside risk	2.14	2.60	-0.46
Omega ratio: Gain probability vs. loss probability	1.26	1.32	-0.06
Calmar ratio: Return relative to maximum drawdown	2.23	3.12	-0.89
Martin ratio: Return relative to average drawdown	8.50	11.05	-2.55
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VO vs. FSMAX - Sharpe Ratio Comparison

The current VO Sharpe Ratio is 1.48, which is comparable to the FSMAX Sharpe Ratio of 1.87. The chart below compares the historical Sharpe Ratios of VO and FSMAX, 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

	VO	FSMAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.48	1.87	-0.39
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.45	0.31	+0.14
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.61	0.40	+0.21
Sharpe Ratio (All Time) Calculated using the full available price history	0.50	0.46	+0.04

Drawdowns

VO vs. FSMAX - Drawdown Comparison

The maximum VO drawdown since its inception was -58.87%, which is greater than FSMAX's maximum drawdown of -50.55%. Use the drawdown chart below to compare losses from any high point for VO and FSMAX.

Drawdown Indicators

	VO	FSMAX	Difference
Max Drawdown Largest peak-to-trough decline	-58.87%	-50.55%	-8.32%
Max Drawdown (1Y) Largest decline over 1 year	-8.17%	-10.26%	+2.09%
Max Drawdown (3Y) Largest decline over 3 years	-19.02%	-26.82%	+7.80%
Max Drawdown (5Y) Largest decline over 5 years	-27.57%	-36.31%	+8.74%
Max Drawdown (10Y) Largest decline over 10 years	-39.37%	-50.55%	+11.18%
Current Drawdown Current decline from peak	-0.45%	0.00%	-0.45%
Average Drawdown Average peak-to-trough decline	-7.86%	-12.17%	+4.31%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.14%	2.90%	-0.76%

Volatility

VO vs. FSMAX - Volatility Comparison

The current volatility for Vanguard Mid-Cap ETF (VO) is 2.99%, while Fidelity Extended Market Index Fund (FSMAX) has a volatility of 4.70%. This indicates that VO experiences smaller price fluctuations and is considered to be less risky than FSMAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VO	FSMAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.99%	4.70%	-1.71%
Volatility (6M) Calculated over the trailing 6-month period	9.21%	12.46%	-3.25%
Volatility (1Y) Calculated over the trailing 1-year period	12.34%	17.17%	-4.83%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.59%	22.33%	-4.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.95%	30.24%	-11.29%

VO vs. FSMAX - Expense Ratio Comparison

VO has a 0.03% expense ratio, which is lower than FSMAX's 0.04% 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

VO vs. FSMAX - Dividend Comparison

VO's dividend yield for the trailing twelve months is around 1.36%, more than FSMAX's 0.50% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSMAX Fidelity Extended Market Index Fund	0.50%	0.57%	0.48%	1.17%	1.90%	7.49%	2.14%	4.30%	6.09%	5.44%	4.85%	6.34%
VO Vanguard Mid-Cap ETF	1.36%	1.52%	1.49%	1.52%	1.60%	1.12%	1.45%	1.48%	1.82%	1.35%	1.45%	1.47%

Frequently Asked Questions

Can I hold both VO and FSMAX in my portfolio?

With a correlation of 0.91, VO and FSMAX 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, VO or FSMAX?

FSMAX has higher volatility (4.70%) compared to VO (2.99%). In terms of maximum drawdown, VO dropped -58.87% vs FSMAX's -50.55%.

Which has better risk-adjusted returns?

FSMAX currently has the higher Sharpe Ratio (1.87 vs 1.48), 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.