FIIAX vs. FSMDX

Last updated Apr 1, 2026

Compare and contrast key facts about Fidelity Advisor Mid Cap II Fund Class A (FIIAX) and Fidelity Mid Cap Index Fund (FSMDX).

FIIAX is managed by Fidelity. It was launched on Aug 12, 2004. FSMDX is managed by Fidelity. It was launched on Sep 8, 2011.

Performance

FIIAX vs. FSMDX - Performance Comparison

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

FIIAX vs. FSMDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FIIAX Fidelity Advisor Mid Cap II Fund Class A	1.23%	7.21%	16.96%	14.68%	-15.04%	24.94%	18.34%	23.32%	-15.21%	20.32%
FSMDX Fidelity Mid Cap Index Fund	-1.30%	10.58%	15.55%	17.20%	-17.27%	22.56%	17.13%	30.53%	-9.38%	18.04%

Returns By Period

In the year-to-date period, FIIAX achieves a 1.23% return, which is significantly higher than FSMDX's -1.30% return. Both investments have delivered pretty close results over the past 10 years, with FIIAX having a 10.32% annualized return and FSMDX not far ahead at 10.52%.

FIIAX

• 1D: -1.47%
• 1M: -8.85%
• YTD: 1.23%
• 6M: 5.43%
• 1Y: 21.37%
• 3Y*: 12.14%
• 5Y*: 6.87%
• 10Y*: 10.32%

FSMDX

• 1D: -0.76%
• 1M: -7.77%
• YTD: -1.30%
• 6M: -1.14%
• 1Y: 13.02%
• 3Y*: 12.41%
• 5Y*: 6.74%
• 10Y*: 10.52%

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

FIIAX vs. FSMDX - Expense Ratio Comparison

FIIAX has a 1.00% expense ratio, which is higher than FSMDX's 0.03% expense ratio.

FIIAX

Fidelity Advisor Mid Cap II Fund Class A

FSMDX

Fidelity Mid Cap Index Fund

Return for Risk

FIIAX vs. FSMDX — Risk / Return Rank

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

FIIAX

FIIAX Risk / Return Rank: 54
FIIAX Sharpe Ratio Rank: 52
FIIAX Sortino Ratio Rank: 53
FIIAX Omega Ratio Rank: 52
FIIAX Calmar Ratio Rank: 54
FIIAX Martin Ratio Rank: 59

FSMDX

FSMDX Risk / Return Rank: 34
FSMDX Sharpe Ratio Rank: 33
FSMDX Sortino Ratio Rank: 34
FSMDX Omega Ratio Rank: 33
FSMDX Calmar Ratio Rank: 31
FSMDX Martin Ratio Rank: 39

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.

FIIAX vs. FSMDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Advisor Mid Cap II Fund Class A (FIIAX) 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.

	FIIAX	FSMDX	Difference
Sharpe ratio Return per unit of total volatility	0.98	0.72	+0.26
Sortino ratio Return per unit of downside risk	1.44	1.13	+0.31
Omega ratio Gain probability vs. loss probability	1.21	1.16	+0.05
Calmar ratio Return relative to maximum drawdown	1.29	0.87	+0.42
Martin ratio Return relative to average drawdown	5.70	4.07	+1.63
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FIIAX vs. FSMDX - Sharpe Ratio Comparison

The current FIIAX Sharpe Ratio is 0.98, which is higher than the FSMDX Sharpe Ratio of 0.72. The chart below compares the historical Sharpe Ratios of FIIAX and FSMDX, 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

	FIIAX	FSMDX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.98	0.72	+0.26
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.34	0.37	-0.03
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.49	0.55	-0.05
Sharpe Ratio (All Time) Calculated using the full available price history	0.49	0.65	-0.16

Correlation

The correlation between FIIAX and FSMDX is 0.97, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

FIIAX vs. FSMDX - Dividend Comparison

FIIAX's dividend yield for the trailing twelve months is around 6.98%, more than FSMDX's 1.12% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FIIAX Fidelity Advisor Mid Cap II Fund Class A	6.98%	6.21%	6.89%	2.59%	5.68%	18.94%	1.12%	3.21%	10.53%	7.60%	8.69%	4.74%
FSMDX Fidelity Mid Cap Index Fund	1.12%	1.10%	2.46%	1.39%	2.07%	3.35%	2.34%	2.86%	2.21%	2.17%	2.23%	2.84%

Drawdowns

FIIAX vs. FSMDX - Drawdown Comparison

The maximum FIIAX drawdown since its inception was -53.35%, which is greater than FSMDX's maximum drawdown of -40.35%. Use the drawdown chart below to compare losses from any high point for FIIAX and FSMDX.

Drawdown Indicators

	FIIAX	FSMDX	Difference
Max Drawdown Largest peak-to-trough decline	-53.35%	-40.35%	-13.00%
Max Drawdown (1Y) Largest decline over 1 year	-14.85%	-13.42%	-1.43%
Max Drawdown (5Y) Largest decline over 5 years	-28.25%	-26.07%	-2.18%
Max Drawdown (10Y) Largest decline over 10 years	-42.33%	-40.35%	-1.98%
Current Drawdown Current decline from peak	-9.83%	-8.16%	-1.67%
Average Drawdown Average peak-to-trough decline	-8.26%	-5.00%	-3.26%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.35%	2.86%	+0.49%

Volatility

FIIAX vs. FSMDX - Volatility Comparison

Fidelity Advisor Mid Cap II Fund Class A (FIIAX) has a higher volatility of 7.71% compared to Fidelity Mid Cap Index Fund (FSMDX) at 4.74%. This indicates that FIIAX'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

	FIIAX	FSMDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.71%	4.74%	+2.97%
Volatility (6M) Calculated over the trailing 6-month period	13.46%	10.17%	+3.29%
Volatility (1Y) Calculated over the trailing 1-year period	22.07%	18.96%	+3.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.23%	18.23%	+2.00%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.94%	19.28%	+1.66%