PIOTX vs. SSSYX

Last updated Jun 4, 2026

PIOTX (Pioneer Core Equity Fund) and SSSYX (State Street Equity 500 Index Fund Class K) are both Large Cap Blend Equities funds. Over the past 10 years, PIOTX returned 13.79%/yr vs 15.61%/yr for SSSYX. Their correlation of 0.94 suggests significant overlap in exposure. PIOTX charges 0.88%/yr vs 0.02%/yr for SSSYX.

Performance

PIOTX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Pioneer Core Equity Fund (PIOTX) 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 PIOTX having a 11.49% return and SSSYX slightly higher at 11.69%. Over the past 10 years, PIOTX has underperformed SSSYX with an annualized return of 13.79%, while SSSYX has yielded a comparatively higher 15.61% annualized return.

PIOTX

• 1D: 0.52%
• 1M: 7.35%
• YTD: 11.49%
• 6M: 11.23%
• 1Y: 27.82%
• 3Y*: 17.73%
• 5Y*: 10.16%
• 10Y*: 13.79%

SSSYX

• 1D: 0.14%
• 1M: 5.79%
• YTD: 11.69%
• 6M: 11.73%
• 1Y: 28.94%
• 3Y*: 22.73%
• 5Y*: 14.24%
• 10Y*: 15.61%

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

PIOTX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PIOTX Pioneer Core Equity Fund	11.49%	16.94%	14.35%	18.18%	-17.27%	25.81%	20.98%	31.42%	-8.32%	24.89%
SSSYX State Street Equity 500 Index Fund Class K	11.69%	17.81%	24.99%	26.27%	-18.16%	28.51%	18.31%	31.38%	-4.38%	21.61%

Correlation

The correlation between PIOTX and SSSYX is 0.81, 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	0.81
Correlation (3Y) Calculated over the trailing 3-year period	0.87
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.94
Correlation (All Time) Calculated using the full available price history since Sep 19, 2014	0.94

The correlation between PIOTX and SSSYX shifts across timeframes, from 0.81 (1 year) to 0.94 (all time), reflecting how their relationship changes across market environments.

Return for Risk

PIOTX vs. SSSYX — Risk / Return Rank

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

PIOTX

PIOTX Risk / Return Rank: 64
PIOTX Sharpe Ratio Rank: 68
PIOTX Sortino Ratio Rank: 60
PIOTX Omega Ratio Rank: 60
PIOTX Calmar Ratio Rank: 76
PIOTX Martin Ratio Rank: 58

SSSYX

SSSYX Risk / Return Rank: 73
SSSYX Sharpe Ratio Rank: 75
SSSYX Sortino Ratio Rank: 67
SSSYX Omega Ratio Rank: 67
SSSYX Calmar Ratio Rank: 74
SSSYX Martin Ratio Rank: 83

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.

PIOTX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Pioneer Core Equity Fund (PIOTX) 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.

	PIOTX	SSSYX	Difference
Sharpe ratio: Return per unit of total volatility	2.40	2.52	-0.11
Sortino ratio: Return per unit of downside risk	3.26	3.42	-0.16
Omega ratio: Gain probability vs. loss probability	1.43	1.46	-0.03
Calmar ratio: Return relative to maximum drawdown	3.45	3.36	+0.09
Martin ratio: Return relative to average drawdown	11.56	15.69	-4.13
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PIOTX vs. SSSYX - Sharpe Ratio Comparison

The current PIOTX Sharpe Ratio is 2.40, which is comparable to the SSSYX Sharpe Ratio of 2.52. The chart below compares the historical Sharpe Ratios of PIOTX 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.

Sharpe Ratios by Period

	PIOTX	SSSYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.40	2.52	-0.11
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.60	0.85	-0.24
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.77	0.13	+0.64
Sharpe Ratio (All Time) Calculated using the full available price history	0.14	0.12	+0.02

Drawdowns

PIOTX vs. SSSYX - Drawdown Comparison

The maximum PIOTX drawdown since its inception was -66.24%, smaller than the maximum SSSYX drawdown of -91.48%. Use the drawdown chart below to compare losses from any high point for PIOTX and SSSYX.

Drawdown Indicators

	PIOTX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-66.24%	-91.48%	+25.24%
Max Drawdown (1Y) Largest decline over 1 year	-8.35%	-8.88%	+0.53%
Max Drawdown (3Y) Largest decline over 3 years	-20.40%	-18.74%	-1.66%
Max Drawdown (5Y) Largest decline over 5 years	-26.49%	-24.49%	-2.00%
Max Drawdown (10Y) Largest decline over 10 years	-31.79%	-91.48%	+59.69%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-20.15%	-4.15%	-16.00%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.49%	1.90%	+0.59%

Volatility

PIOTX vs. SSSYX - Volatility Comparison

Pioneer Core Equity Fund (PIOTX) has a higher volatility of 3.03% compared to State Street Equity 500 Index Fund Class K (SSSYX) at 2.82%. This indicates that PIOTX's price experiences larger fluctuations and is considered to be riskier than SSSYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PIOTX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.03%	2.82%	+0.21%
Volatility (6M) Calculated over the trailing 6-month period	8.31%	8.96%	-0.65%
Volatility (1Y) Calculated over the trailing 1-year period	11.98%	11.85%	+0.13%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.91%	16.88%	+0.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.98%	124.46%	-106.48%

PIOTX vs. SSSYX - Expense Ratio Comparison

PIOTX has a 0.88% expense ratio, which is higher than SSSYX's 0.02% expense ratio.

Dividends

PIOTX vs. SSSYX - Dividend Comparison

PIOTX's dividend yield for the trailing twelve months is around 6.76%, more than SSSYX's 1.29% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PIOTX Pioneer Core Equity Fund	6.76%	7.53%	5.87%	2.83%	7.10%	20.38%	8.56%	3.06%	19.73%	9.04%	1.13%	0.74%
SSSYX State Street Equity 500 Index Fund Class K	1.29%	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 PIOTX and SSSYX in my portfolio?

PIOTX and SSSYX have a correlation of 0.81, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, PIOTX or SSSYX?

PIOTX has higher volatility (3.03%) compared to SSSYX (2.82%). In terms of maximum drawdown, PIOTX dropped -66.24% vs SSSYX's -91.48%.

Which has better risk-adjusted returns?

SSSYX currently has the higher Sharpe Ratio (2.52 vs 2.40), 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.