FIIMX vs. FSMDX

Last updated Aug 1, 2026

FIIMX (Fidelity Advisor Mid Cap II Fund Class I) and FSMDX (Fidelity Mid Cap Index Fund) are both Mid Cap Blend Equities funds from Fidelity. Over the past 10 years, FIIMX returned 11.63%/yr vs 11.45%/yr for FSMDX. Their 0.97 correlation means they have historically moved very closely together. FIIMX charges 0.73%/yr vs 0.03%/yr for FSMDX.

Performance

FIIMX vs. FSMDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Advisor Mid Cap II Fund Class I (FIIMX) 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, FIIMX achieves a 21.66% return, which is significantly higher than FSMDX's 14.95% return. Both investments have delivered pretty close results over the past 10 years, with FIIMX having a 11.63% annualized return and FSMDX not far behind at 11.45%.

FIIMX

• 1D: 1.81%
• 1M: -2.80%
• 6M: 15.85%
• YTD: 21.66%
• 1Y: 34.23%
• 3Y*: 16.36%
• 5Y*: 10.35%
• 10Y*: 11.63%
• ALL TIME*: 10.65%

FSMDX

• 1D: 0.35%
• 1M: -0.33%
• 6M: 11.53%
• YTD: 14.95%
• 1Y: 20.72%
• 3Y*: 14.95%
• 5Y*: 8.30%
• 10Y*: 11.45%
• ALL TIME*: 12.64%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
FIIMX Fidelity Advisor Mid Cap II Fund Class I	$0.00	$0.00	$0.00
FSMDX Fidelity Mid Cap Index Fund	$0.00	$0.00	$0.00

FIIMX vs. FSMDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FIIMX Fidelity Advisor Mid Cap II Fund Class I	21.66%	7.71%	17.21%	15.01%	-14.80%	25.26%	18.68%	23.72%	-14.97%	20.62%
FSMDX Fidelity Mid Cap Index Fund	14.95%	10.58%	15.55%	17.20%	-17.27%	22.56%	17.13%	30.53%	-9.38%	18.04%

Correlation

The correlation between FIIMX and FSMDX is 0.90, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.90
Correlation (3Y) Balances recent behavior with more history.	0.94
Correlation (5Y) Shows whether the relationship held over a longer period.	0.96
Correlation (10Y) Provides a long-term view across more market conditions.	0.96
Correlation (All Time) Calculated using the full available price history since Sep 9, 2011	0.97

The correlation between FIIMX and FSMDX has been stable across timeframes, ranging from 0.90 to 0.97 - a consistent structural relationship.

Return for Risk

FIIMX vs. FSMDX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

FIIMX

FIIMX Risk / Return Rank: 78
FIIMX Sharpe Ratio Rank: 73
FIIMX Sortino Ratio Rank: 72
FIIMX Omega Ratio Rank: 68
FIIMX Calmar Ratio Rank: 88
FIIMX Martin Ratio Rank: 88

FSMDX

FSMDX Risk / Return Rank: 61
FSMDX Sharpe Ratio Rank: 53
FSMDX Sortino Ratio Rank: 55
FSMDX Omega Ratio Rank: 49
FSMDX Calmar Ratio Rank: 72
FSMDX Martin Ratio Rank: 74

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

FIIMX vs. FSMDX - Risk-Adjusted Trends Comparison

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

	FIIMX	FSMDX	Difference
Sharpe ratio: Return per unit of total volatility	1.74	1.34	+0.40
Sortino ratio: Return per unit of downside risk	2.46	1.96	+0.49
Omega ratio: Gain probability vs. loss probability	1.30	1.24	+0.06
Calmar ratio: Return relative to maximum drawdown	3.20	2.25	+0.96
Martin ratio: Return relative to average drawdown	11.67	8.71	+2.97

FIIMX vs. FSMDX - Sharpe Ratio Comparison

The current FIIMX Sharpe Ratio is 1.74, which is comparable to the FSMDX Sharpe Ratio of 1.34. The chart below compares the historical Sharpe Ratios of FIIMX 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

FIIMX vs. FSMDX - Drawdown Comparison

The maximum FIIMX drawdown since its inception was -53.22%, which is greater than FSMDX's maximum drawdown of -40.35%. Use the drawdown chart below to compare losses from any high point for FIIMX and FSMDX.

Drawdown Indicators

	FIIMX	FSMDX	Difference
Max Drawdown Largest peak-to-trough decline	-53.22%	-40.35%	-12.87%
Max Drawdown (1Y) Largest decline over 1 year	-9.83%	-8.16%	-1.67%
Max Drawdown (3Y) Largest decline over 3 years	-28.06%	-20.92%	-7.14%
Max Drawdown (5Y) Largest decline over 5 years	-28.06%	-26.07%	-1.99%
Max Drawdown (10Y) Largest decline over 10 years	-42.29%	-40.35%	-1.94%
Current Drawdown Current decline from peak	-5.39%	-0.66%	-4.73%
Average Drawdown Average peak-to-trough decline	-8.02%	-4.91%	-3.11%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.70%	2.11%	+0.59%

Volatility

FIIMX vs. FSMDX - Volatility Comparison

Fidelity Advisor Mid Cap II Fund Class I (FIIMX) has a higher volatility of 4.60% compared to Fidelity Mid Cap Index Fund (FSMDX) at 2.42%. This indicates that FIIMX'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

	FIIMX	FSMDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.60%	2.42%	+2.18%
Volatility (6M) Calculated over the trailing 6-month period	14.48%	10.22%	+4.26%
Volatility (1Y) Calculated over the trailing 1-year period	18.14%	13.71%	+4.43%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.37%	18.26%	+2.11%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.96%	19.27%	+1.69%

FIIMX vs. FSMDX - Expense Ratio Comparison

FIIMX has a 0.73% expense ratio, which is higher than FSMDX's 0.03% expense ratio.

Dividends

FIIMX vs. FSMDX - Dividend Comparison

FIIMX's dividend yield for the trailing twelve months is around 5.65%, more than FSMDX's 0.76% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FIIMX Fidelity Advisor Mid Cap II Fund Class I	5.65%	6.06%	6.79%	2.71%	5.70%	18.41%	1.29%	3.30%	10.56%	7.67%	4.84%	4.76%
FSMDX Fidelity Mid Cap Index Fund	0.76%	1.10%	2.46%	1.39%	2.07%	3.35%	2.34%	2.86%	2.21%	2.17%	2.23%	2.84%

Frequently Asked Questions

Can I hold both FIIMX and FSMDX in my portfolio?

With a correlation of 0.90, FIIMX 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, FIIMX or FSMDX?

FIIMX has higher volatility (4.60%) compared to FSMDX (2.42%). In terms of maximum drawdown, FIIMX dropped -53.22% vs FSMDX's -40.35%.

Which has better risk-adjusted returns?

FIIMX currently has the higher Sharpe Ratio (1.74 vs 1.34), 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.