FZALX vs. SSSYX

Last updated Jun 24, 2026

FZALX (Fidelity Advisor Mega Cap Stock Fund Class Z) and SSSYX (State Street Equity 500 Index Fund Class K) are both mutual funds - FZALX is a Large Cap Blend Equities fund managed by Fidelity, while SSSYX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, FZALX returned 17.07%/yr vs 45.70%/yr for SSSYX. Their correlation of 0.93 suggests significant overlap in exposure. FZALX charges 0.51%/yr vs 0.02%/yr for SSSYX.

Performance

FZALX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Advisor Mega Cap Stock Fund Class Z (FZALX) and State Street Equity 500 Index Fund Class K (SSSYX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with FZALX having a 9.32% return and SSSYX slightly higher at 9.78%. Over the past 10 years, FZALX has underperformed SSSYX with an annualized return of 17.07%, while SSSYX has yielded a comparatively higher 45.70% annualized return.

FZALX

• 1D: -0.76%
• 1M: -0.12%
• YTD: 9.32%
• 6M: 8.79%
• 1Y: 28.19%
• 3Y*: 25.22%
• 5Y*: 16.52%
• 10Y*: 17.07%

SSSYX

• 1D: -0.36%
• 1M: 0.10%
• YTD: 9.78%
• 6M: 8.78%
• 1Y: 25.47%
• 3Y*: 21.36%
• 5Y*: 13.57%
• 10Y*: 45.70%

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

FZALX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FZALX Fidelity Advisor Mega Cap Stock Fund Class Z	9.32%	27.07%	26.13%	26.63%	-8.89%	26.44%	13.06%	31.25%	-7.31%	18.01%
SSSYX State Street Equity 500 Index Fund Class K	9.78%	17.81%	24.99%	26.27%	-18.16%	28.51%	1,083.11%	31.38%	-4.38%	21.61%

Correlation

The correlation between FZALX and SSSYX is 0.94, 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	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Sep 18, 2014	0.93

The correlation between FZALX and SSSYX has been stable across timeframes, ranging from 0.93 to 0.95 - a consistent structural relationship.

Return for Risk

FZALX vs. SSSYX — Risk / Return Rank

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

FZALX

FZALX Risk / Return Rank: 75
FZALX Sharpe Ratio Rank: 76
FZALX Sortino Ratio Rank: 71
FZALX Omega Ratio Rank: 68
FZALX Calmar Ratio Rank: 76
FZALX Martin Ratio Rank: 83

SSSYX

SSSYX Risk / Return Rank: 65
SSSYX Sharpe Ratio Rank: 63
SSSYX Sortino Ratio Rank: 57
SSSYX Omega Ratio Rank: 59
SSSYX Calmar Ratio Rank: 68
SSSYX Martin Ratio Rank: 78

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.

FZALX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Advisor Mega Cap Stock Fund Class Z (FZALX) and State Street Equity 500 Index Fund Class K (SSSYX). 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.

	FZALX	SSSYX	Difference
Sharpe ratio: Return per unit of total volatility	2.33	2.15	+0.18
Sortino ratio: Return per unit of downside risk	3.20	2.91	+0.30
Omega ratio: Gain probability vs. loss probability	1.42	1.39	+0.03
Calmar ratio: Return relative to maximum drawdown	3.25	3.02	+0.24
Martin ratio: Return relative to average drawdown	14.45	13.62	+0.83

FZALX vs. SSSYX - Sharpe Ratio Comparison

The current FZALX Sharpe Ratio is 2.33, which is comparable to the SSSYX Sharpe Ratio of 2.15. The chart below compares the historical Sharpe Ratios of FZALX and SSSYX, 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

FZALX vs. SSSYX - Drawdown Comparison

The maximum FZALX drawdown since its inception was -35.23%, roughly equal to the maximum SSSYX drawdown of -33.77%. Use the drawdown chart below to compare losses from any high point for FZALX and SSSYX.

Drawdown Indicators

	FZALX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-35.23%	-33.77%	-1.46%
Max Drawdown (1Y) Largest decline over 1 year	-8.99%	-8.88%	-0.11%
Max Drawdown (3Y) Largest decline over 3 years	-18.49%	-18.74%	+0.25%
Max Drawdown (5Y) Largest decline over 5 years	-23.25%	-24.49%	+1.24%
Max Drawdown (10Y) Largest decline over 10 years	-35.23%	-33.77%	-1.46%
Current Drawdown Current decline from peak	-1.42%	-1.72%	+0.30%
Average Drawdown Average peak-to-trough decline	-3.77%	-3.91%	+0.14%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.02%	1.96%	+0.06%

Volatility

FZALX vs. SSSYX - Volatility Comparison

The current volatility for Fidelity Advisor Mega Cap Stock Fund Class Z (FZALX) is 4.35%, while State Street Equity 500 Index Fund Class K (SSSYX) has a volatility of 4.67%. This indicates that FZALX experiences smaller price fluctuations and is considered to be less risky than SSSYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FZALX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.35%	4.67%	-0.32%
Volatility (6M) Calculated over the trailing 6-month period	9.70%	9.83%	-0.13%
Volatility (1Y) Calculated over the trailing 1-year period	12.56%	12.49%	+0.07%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.76%	16.98%	-0.22%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.17%	121.18%	-103.01%

FZALX vs. SSSYX - Expense Ratio Comparison

FZALX has a 0.51% expense ratio, which is higher than SSSYX's 0.02% expense ratio.

Dividends

FZALX vs. SSSYX - Dividend Comparison

FZALX's dividend yield for the trailing twelve months is around 3.69%, more than SSSYX's 1.31% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FZALX Fidelity Advisor Mega Cap Stock Fund Class Z	3.69%	4.04%	2.83%	2.17%	4.51%	4.92%	8.14%	13.19%	21.94%	16.56%	2.12%	4.33%
SSSYX State Street Equity 500 Index Fund Class K	1.31%	1.44%	1.63%	1.78%	2.16%	2.76%	1.86%	4.44%	5.18%	5.94%	2.07%	1.84%

Frequently Asked Questions

Can I hold both FZALX and SSSYX in my portfolio?

With a correlation of 0.94, FZALX and SSSYX 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, FZALX or SSSYX?

SSSYX has higher volatility (4.67%) compared to FZALX (4.35%). In terms of maximum drawdown, FZALX dropped -35.23% vs SSSYX's -33.77%.

Which has better risk-adjusted returns?

FZALX currently has the higher Sharpe Ratio (2.33 vs 2.15), 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.