SPFIX vs. PUTW

Last updated Jun 4, 2026

SPFIX (Shelton Capital Management S&P 500 Index Fund) and PUTW (WisdomTree Equity Premium Income Fund) are both mutual funds - SPFIX is a S&P 500 fund tracking the S&P 500 Index, while PUTW is a Derivative Income fund tracking the Volos U.S. Large Cap Target 2.5% PutWrite Index. Both are passively managed. Over the past 10 years, SPFIX returned 17.69%/yr vs 8.30%/yr for PUTW. A 0.79 correlation means they provide meaningful diversification when combined. SPFIX charges 0.43%/yr vs 0.44%/yr for PUTW.

Performance

SPFIX vs. PUTW - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Shelton Capital Management S&P 500 Index Fund (SPFIX) and WisdomTree Equity Premium Income Fund (PUTW). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SPFIX achieves a 11.42% return, which is significantly higher than PUTW's 4.26% return. Over the past 10 years, SPFIX has outperformed PUTW with an annualized return of 17.69%, while PUTW has yielded a comparatively lower 8.30% annualized return.

SPFIX

• 1D: 0.14%
• 1M: 5.71%
• YTD: 11.42%
• 6M: 11.42%
• 1Y: 28.45%
• 3Y*: 27.82%
• 5Y*: 16.92%
• 10Y*: 17.69%

PUTW

• 1D: -0.18%
• 1M: 1.94%
• YTD: 4.26%
• 6M: 4.65%
• 1Y: 18.84%
• 3Y*: 13.62%
• 5Y*: 9.92%
• 10Y*: 8.30%

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

SPFIX vs. PUTW - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SPFIX Shelton Capital Management S&P 500 Index Fund	11.42%	17.23%	42.83%	25.48%	-18.22%	27.99%	17.41%	41.64%	-4.68%	21.55%
PUTW WisdomTree Equity Premium Income Fund	4.26%	14.45%	17.18%	15.53%	-10.11%	20.94%	1.65%	13.55%	-7.16%	10.09%

Correlation

The correlation between SPFIX and PUTW is 0.84, 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	0.84
Correlation (3Y) Calculated over the trailing 3-year period	0.86
Correlation (5Y) Calculated over the trailing 5-year period	0.83
Correlation (10Y) Calculated over the trailing 10-year period	0.79
Correlation (All Time) Calculated using the full available price history since Feb 25, 2016	0.79

The correlation between SPFIX and PUTW has been stable across timeframes, ranging from 0.79 to 0.86 - a consistent structural relationship.

Return for Risk

SPFIX vs. PUTW — Risk / Return Rank

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

SPFIX

SPFIX Risk / Return Rank: 72
SPFIX Sharpe Ratio Rank: 73
SPFIX Sortino Ratio Rank: 66
SPFIX Omega Ratio Rank: 65
SPFIX Calmar Ratio Rank: 72
SPFIX Martin Ratio Rank: 82

PUTW

PUTW Risk / Return Rank: 55
PUTW Sharpe Ratio Rank: 52
PUTW Sortino Ratio Rank: 50
PUTW Omega Ratio Rank: 60
PUTW Calmar Ratio Rank: 48
PUTW Martin Ratio Rank: 65

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.

SPFIX vs. PUTW - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Shelton Capital Management S&P 500 Index Fund (SPFIX) and WisdomTree Equity Premium Income Fund (PUTW). 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.

	SPFIX	PUTW	Difference
Sharpe ratio: Return per unit of total volatility	2.48	2.14	+0.35
Sortino ratio: Return per unit of downside risk	3.38	2.98	+0.40
Omega ratio: Gain probability vs. loss probability	1.45	1.43	+0.02
Calmar ratio: Return relative to maximum drawdown	3.29	2.65	+0.65
Martin ratio: Return relative to average drawdown	15.35	12.69	+2.65
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SPFIX vs. PUTW - Sharpe Ratio Comparison

The current SPFIX Sharpe Ratio is 2.48, which is comparable to the PUTW Sharpe Ratio of 2.14. The chart below compares the historical Sharpe Ratios of SPFIX and PUTW, 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

	SPFIX	PUTW	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.48	2.14	+0.35
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.93	0.82	+0.11
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.94	0.63	+0.31
Sharpe Ratio (All Time) Calculated using the full available price history	0.59	0.65	-0.06

Drawdowns

SPFIX vs. PUTW - Drawdown Comparison

The maximum SPFIX drawdown since its inception was -54.81%, which is greater than PUTW's maximum drawdown of -28.40%. Use the drawdown chart below to compare losses from any high point for SPFIX and PUTW.

Drawdown Indicators

	SPFIX	PUTW	Difference
Max Drawdown Largest peak-to-trough decline	-54.81%	-28.40%	-26.41%
Max Drawdown (1Y) Largest decline over 1 year	-8.90%	-7.15%	-1.75%
Max Drawdown (3Y) Largest decline over 3 years	-18.94%	-15.26%	-3.68%
Max Drawdown (5Y) Largest decline over 5 years	-24.69%	-16.56%	-8.13%
Max Drawdown (10Y) Largest decline over 10 years	-33.83%	-28.40%	-5.43%
Current Drawdown Current decline from peak	0.00%	-0.27%	+0.27%
Average Drawdown Average peak-to-trough decline	-8.95%	-3.44%	-5.51%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.91%	1.49%	+0.42%

Volatility

SPFIX vs. PUTW - Volatility Comparison

Shelton Capital Management S&P 500 Index Fund (SPFIX) has a higher volatility of 2.82% compared to WisdomTree Equity Premium Income Fund (PUTW) at 0.90%. This indicates that SPFIX's price experiences larger fluctuations and is considered to be riskier than PUTW based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPFIX	PUTW	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.82%	0.90%	+1.92%
Volatility (6M) Calculated over the trailing 6-month period	8.93%	7.00%	+1.93%
Volatility (1Y) Calculated over the trailing 1-year period	11.81%	8.86%	+2.95%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.23%	12.13%	+6.10%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.88%	13.22%	+5.66%

SPFIX vs. PUTW - Expense Ratio Comparison

SPFIX has a 0.43% expense ratio, which is lower than PUTW's 0.44% expense ratio.

Dividends

SPFIX vs. PUTW - Dividend Comparison

SPFIX's dividend yield for the trailing twelve months is around 3.26%, less than PUTW's 12.06% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PUTW WisdomTree Equity Premium Income Fund	12.06%	13.18%	11.99%	8.94%	3.27%	0.00%	1.43%	1.47%	6.46%	3.52%	2.27%	0.00%
SPFIX Shelton Capital Management S&P 500 Index Fund	3.26%	3.45%	27.20%	8.08%	5.07%	5.43%	8.06%	16.60%	2.49%	3.01%	2.92%	4.35%

Frequently Asked Questions

Can I hold both SPFIX and PUTW in my portfolio?

SPFIX and PUTW have a correlation of 0.84, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SPFIX or PUTW?

SPFIX has higher volatility (2.82%) compared to PUTW (0.90%). In terms of maximum drawdown, SPFIX dropped -54.81% vs PUTW's -28.40%.

Which has better risk-adjusted returns?

SPFIX currently has the higher Sharpe Ratio (2.48 vs 2.14), 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.