SKTAX vs. SPINX

Last updated Jun 23, 2026

SKTAX (SEI Asset Allocation Trust Core Market Strategy Allocation Fund) and SPINX (SEI Institutional Investments Trust S&P 500 Index Fund) are both mutual funds - SKTAX is a Diversified Portfolio fund managed by SEI, while SPINX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, SKTAX returned 10.93%/yr vs 15.43%/yr for SPINX. Their correlation of 0.94 suggests significant overlap in exposure. SKTAX charges 0.61%/yr vs 0.12%/yr for SPINX.

Performance

SKTAX vs. SPINX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SEI Asset Allocation Trust Core Market Strategy Allocation Fund (SKTAX) and SEI Institutional Investments Trust S&P 500 Index Fund (SPINX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SKTAX achieves a 8.84% return, which is significantly lower than SPINX's 10.16% return. Over the past 10 years, SKTAX has underperformed SPINX with an annualized return of 10.93%, while SPINX has yielded a comparatively higher 15.43% annualized return.

SKTAX

• 1D: 0.61%
• 1M: 0.85%
• YTD: 8.84%
• 6M: 8.33%
• 1Y: 23.09%
• 3Y*: 15.53%
• 5Y*: 9.25%
• 10Y*: 10.93%

SPINX

• 1D: 1.10%
• 1M: 0.48%
• YTD: 10.16%
• 6M: 9.64%
• 1Y: 27.21%
• 3Y*: 20.65%
• 5Y*: 13.85%
• 10Y*: 15.43%

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

SKTAX vs. SPINX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SKTAX SEI Asset Allocation Trust Core Market Strategy Allocation Fund	8.84%	18.49%	11.72%	16.13%	-14.36%	20.88%	11.19%	24.43%	-8.94%	20.06%
SPINX SEI Institutional Investments Trust S&P 500 Index Fund	10.16%	17.89%	24.02%	26.24%	-18.27%	28.62%	18.35%	31.42%	-4.46%	21.74%

Correlation

The correlation between SKTAX and SPINX 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	0.90
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Dec 19, 2013	0.94

The correlation between SKTAX and SPINX has been stable across timeframes, ranging from 0.90 to 0.94 - a consistent structural relationship.

Return for Risk

SKTAX vs. SPINX — Risk / Return Rank

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

SKTAX

SKTAX Risk / Return Rank: 63
SKTAX Sharpe Ratio Rank: 64
SKTAX Sortino Ratio Rank: 65
SKTAX Omega Ratio Rank: 60
SKTAX Calmar Ratio Rank: 60
SKTAX Martin Ratio Rank: 67

SPINX

SPINX Risk / Return Rank: 67
SPINX Sharpe Ratio Rank: 65
SPINX Sortino Ratio Rank: 58
SPINX Omega Ratio Rank: 61
SPINX Calmar Ratio Rank: 69
SPINX Martin Ratio Rank: 79

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.

SKTAX vs. SPINX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SEI Asset Allocation Trust Core Market Strategy Allocation Fund (SKTAX) and SEI Institutional Investments Trust S&P 500 Index Fund (SPINX). 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.

	SKTAX	SPINX	Difference
Sharpe ratio: Return per unit of total volatility	2.15	2.18	-0.02
Sortino ratio: Return per unit of downside risk	3.07	2.93	+0.14
Omega ratio: Gain probability vs. loss probability	1.39	1.40	0.00
Calmar ratio: Return relative to maximum drawdown	2.83	3.05	-0.22
Martin ratio: Return relative to average drawdown	12.19	13.78	-1.59

SKTAX vs. SPINX - Sharpe Ratio Comparison

The current SKTAX Sharpe Ratio is 2.15, which is comparable to the SPINX Sharpe Ratio of 2.18. The chart below compares the historical Sharpe Ratios of SKTAX and SPINX, 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

SKTAX vs. SPINX - Drawdown Comparison

The maximum SKTAX drawdown since its inception was -56.93%, which is greater than SPINX's maximum drawdown of -33.82%. Use the drawdown chart below to compare losses from any high point for SKTAX and SPINX.

Drawdown Indicators

	SKTAX	SPINX	Difference
Max Drawdown Largest peak-to-trough decline	-56.93%	-33.82%	-23.11%
Max Drawdown (1Y) Largest decline over 1 year	-8.12%	-8.92%	+0.80%
Max Drawdown (3Y) Largest decline over 3 years	-20.28%	-32.91%	+12.63%
Max Drawdown (5Y) Largest decline over 5 years	-26.66%	-32.91%	+6.25%
Max Drawdown (10Y) Largest decline over 10 years	-34.50%	-33.82%	-0.68%
Current Drawdown Current decline from peak	-0.60%	-1.38%	+0.78%
Average Drawdown Average peak-to-trough decline	-8.21%	-5.20%	-3.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.88%	1.97%	-0.09%

Volatility

SKTAX vs. SPINX - Volatility Comparison

The current volatility for SEI Asset Allocation Trust Core Market Strategy Allocation Fund (SKTAX) is 3.48%, while SEI Institutional Investments Trust S&P 500 Index Fund (SPINX) has a volatility of 4.77%. This indicates that SKTAX experiences smaller price fluctuations and is considered to be less risky than SPINX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SKTAX	SPINX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.48%	4.77%	-1.29%
Volatility (6M) Calculated over the trailing 6-month period	8.42%	9.91%	-1.49%
Volatility (1Y) Calculated over the trailing 1-year period	10.68%	12.50%	-1.82%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.92%	22.57%	-6.65%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.52%	20.99%	-4.47%

SKTAX vs. SPINX - Expense Ratio Comparison

SKTAX has a 0.61% expense ratio, which is higher than SPINX's 0.12% expense ratio.

Dividends

SKTAX vs. SPINX - Dividend Comparison

SKTAX's dividend yield for the trailing twelve months is around 15.86%, more than SPINX's 10.82% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SKTAX SEI Asset Allocation Trust Core Market Strategy Allocation Fund	15.86%	17.11%	11.93%	6.63%	10.78%	8.42%	5.73%	4.81%	3.68%	4.45%	1.29%	1.14%
SPINX SEI Institutional Investments Trust S&P 500 Index Fund	10.82%	11.90%	26.02%	9.77%	9.59%	6.58%	3.58%	3.01%	4.94%	2.32%	1.97%	2.29%

Frequently Asked Questions

Can I hold both SKTAX and SPINX in my portfolio?

With a correlation of 0.92, SKTAX and SPINX 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, SKTAX or SPINX?

SPINX has higher volatility (4.77%) compared to SKTAX (3.48%). In terms of maximum drawdown, SKTAX dropped -56.93% vs SPINX's -33.82%.

Which has better risk-adjusted returns?

SPINX currently has the higher Sharpe Ratio (2.18 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.