FZAMX vs. FSMDX

Last updated Jun 23, 2026

FZAMX (Fidelity Advisor Mid Cap II Fund Class Z) and FSMDX (Fidelity Mid Cap Index Fund) are both Mid Cap Blend Equities funds from Fidelity. Over the past 10 years, FZAMX returned 12.86%/yr vs 11.79%/yr for FSMDX. With a 0.97 correlation, they move nearly in lockstep. FZAMX charges 0.61%/yr vs 0.03%/yr for FSMDX.

Performance

FZAMX vs. FSMDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Advisor Mid Cap II Fund Class Z (FZAMX) and Fidelity Mid Cap Index Fund (FSMDX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FZAMX achieves a 25.16% return, which is significantly higher than FSMDX's 13.43% return. Over the past 10 years, FZAMX has outperformed FSMDX with an annualized return of 12.86%, while FSMDX has yielded a comparatively lower 11.79% annualized return.

FZAMX

• 1D: 1.39%
• 1M: 6.05%
• YTD: 25.16%
• 6M: 22.19%
• 1Y: 42.92%
• 3Y*: 21.22%
• 5Y*: 12.67%
• 10Y*: 12.86%

FSMDX

• 1D: 0.99%
• 1M: 2.77%
• YTD: 13.43%
• 6M: 11.53%
• 1Y: 22.95%
• 3Y*: 16.47%
• 5Y*: 8.89%
• 10Y*: 11.79%

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

FZAMX vs. FSMDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FZAMX Fidelity Advisor Mid Cap II Fund Class Z	25.16%	12.00%	17.39%	15.15%	-14.70%	25.40%	18.84%	23.85%	-14.85%	20.78%
FSMDX Fidelity Mid Cap Index Fund	13.43%	10.58%	15.55%	17.20%	-17.27%	22.56%	17.13%	30.53%	-9.38%	18.04%

Correlation

The correlation between FZAMX and FSMDX is 0.92, 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	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.97
Correlation (All Time) Calculated using the full available price history since Aug 20, 2013	0.97

The correlation between FZAMX and FSMDX has been stable across timeframes, ranging from 0.92 to 0.97 - a consistent structural relationship.

Return for Risk

FZAMX vs. FSMDX — Risk / Return Rank

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

FZAMX

FZAMX Risk / Return Rank: 82
FZAMX Sharpe Ratio Rank: 81
FZAMX Sortino Ratio Rank: 74
FZAMX Omega Ratio Rank: 70
FZAMX Calmar Ratio Rank: 91
FZAMX Martin Ratio Rank: 92

FSMDX

FSMDX Risk / Return Rank: 46
FSMDX Sharpe Ratio Rank: 38
FSMDX Sortino Ratio Rank: 39
FSMDX Omega Ratio Rank: 35
FSMDX Calmar Ratio Rank: 60
FSMDX Martin Ratio Rank: 57

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.

FZAMX vs. FSMDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Advisor Mid Cap II Fund Class Z (FZAMX) and Fidelity Mid Cap Index Fund (FSMDX). 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.

	FZAMX	FSMDX	Difference
Sharpe ratio: Return per unit of total volatility	2.44	1.68	+0.76
Sortino ratio: Return per unit of downside risk	3.28	2.40	+0.88
Omega ratio: Gain probability vs. loss probability	1.42	1.29	+0.13
Calmar ratio: Return relative to maximum drawdown	4.41	2.84	+1.57
Martin ratio: Return relative to average drawdown	17.63	10.86	+6.77

FZAMX vs. FSMDX - Sharpe Ratio Comparison

The current FZAMX Sharpe Ratio is 2.44, which is higher than the FSMDX Sharpe Ratio of 1.68. The chart below compares the historical Sharpe Ratios of FZAMX and FSMDX, 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

FZAMX vs. FSMDX - Drawdown Comparison

The maximum FZAMX drawdown since its inception was -42.32%, roughly equal to the maximum FSMDX drawdown of -40.35%. Use the drawdown chart below to compare losses from any high point for FZAMX and FSMDX.

Drawdown Indicators

	FZAMX	FSMDX	Difference
Max Drawdown Largest peak-to-trough decline	-42.32%	-40.35%	-1.97%
Max Drawdown (1Y) Largest decline over 1 year	-9.77%	-8.16%	-1.61%
Max Drawdown (3Y) Largest decline over 3 years	-25.24%	-20.92%	-4.32%
Max Drawdown (5Y) Largest decline over 5 years	-25.24%	-26.07%	+0.83%
Max Drawdown (10Y) Largest decline over 10 years	-42.32%	-40.35%	-1.97%
Current Drawdown Current decline from peak	-0.16%	-0.78%	+0.62%
Average Drawdown Average peak-to-trough decline	-6.06%	-4.94%	-1.12%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.44%	2.13%	+0.31%

Volatility

FZAMX vs. FSMDX - Volatility Comparison

Fidelity Advisor Mid Cap II Fund Class Z (FZAMX) has a higher volatility of 5.81% compared to Fidelity Mid Cap Index Fund (FSMDX) at 4.57%. This indicates that FZAMX's price experiences larger fluctuations and is considered to be riskier than FSMDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FZAMX	FSMDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.81%	4.57%	+1.24%
Volatility (6M) Calculated over the trailing 6-month period	14.22%	10.47%	+3.75%
Volatility (1Y) Calculated over the trailing 1-year period	17.67%	13.82%	+3.85%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.30%	18.33%	+1.97%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.98%	19.35%	+1.63%

FZAMX vs. FSMDX - Expense Ratio Comparison

FZAMX has a 0.61% expense ratio, which is higher than FSMDX's 0.03% expense ratio.

Dividends

FZAMX vs. FSMDX - Dividend Comparison

FZAMX's dividend yield for the trailing twelve months is around 5.63%, more than FSMDX's 0.97% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSMDX Fidelity Mid Cap Index Fund	0.97%	1.10%	2.46%	1.39%	2.07%	3.35%	2.34%	2.86%	2.21%	2.17%	2.23%	2.84%
FZAMX Fidelity Advisor Mid Cap II Fund Class Z	5.63%	10.09%	6.93%	2.83%	5.86%	18.58%	1.41%	3.50%	10.72%	7.81%	5.00%	4.90%

Frequently Asked Questions

Can I hold both FZAMX and FSMDX in my portfolio?

With a correlation of 0.92, FZAMX and FSMDX 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, FZAMX or FSMDX?

FZAMX has higher volatility (5.81%) compared to FSMDX (4.57%). In terms of maximum drawdown, FZAMX dropped -42.32% vs FSMDX's -40.35%.

Which has better risk-adjusted returns?

FZAMX currently has the higher Sharpe Ratio (2.44 vs 1.68), 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.