SPSK vs. VTBIX

Last updated Jun 4, 2026

SPSK (SP Funds Dow Jones Global Sukuk ETF) and VTBIX (Vanguard Total Bond Market II Index Fund Investor Shares) are both funds - SPSK is a Global Bonds fund tracking the Dow Jones Sukuk Total Return (No Coupon Reinvestment), while VTBIX is a Total Bond Market fund managed by Vanguard. Over the past 5 years, SPSK returned 0.83%/yr vs 0.03%/yr for VTBIX. At a 0.46 correlation, their price movements are largely independent. SPSK charges 0.50%/yr vs 0.09%/yr for VTBIX.

Performance

SPSK vs. VTBIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SP Funds Dow Jones Global Sukuk ETF (SPSK) and Vanguard Total Bond Market II Index Fund Investor Shares (VTBIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SPSK achieves a 0.03% return, which is significantly lower than VTBIX's 0.30% return.

SPSK

• 1D: -0.22%
• 1M: 0.40%
• YTD: 0.03%
• 6M: -0.08%
• 1Y: 3.74%
• 3Y*: 3.95%
• 5Y*: 0.83%
• 10Y*: —

VTBIX

• 1D: 0.00%
• 1M: 0.45%
• YTD: 0.30%
• 6M: 0.22%
• 1Y: 5.14%
• 3Y*: 3.84%
• 5Y*: 0.03%
• 10Y*: 1.44%

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

SPSK vs. VTBIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
SPSK SP Funds Dow Jones Global Sukuk ETF	0.03%	6.16%	2.95%	3.95%	-7.75%	-1.30%	3.67%	0.02%
VTBIX Vanguard Total Bond Market II Index Fund Investor Shares	0.30%	7.11%	1.25%	5.03%	-13.18%	-1.88%	7.47%	0.04%

Correlation

The correlation between SPSK and VTBIX is 0.56, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.56
Correlation (3Y) Calculated over the trailing 3-year period	0.46
Correlation (5Y) Calculated over the trailing 5-year period	0.49
Correlation (All Time) Calculated using the full available price history since Dec 31, 2019	0.46

The correlation between SPSK and VTBIX has been stable across timeframes, ranging from 0.46 to 0.56 - a consistent structural relationship.

Return for Risk

SPSK vs. VTBIX — Risk / Return Rank

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

SPSK

SPSK Risk / Return Rank: 27
SPSK Sharpe Ratio Rank: 27
SPSK Sortino Ratio Rank: 26
SPSK Omega Ratio Rank: 24
SPSK Calmar Ratio Rank: 27
SPSK Martin Ratio Rank: 30

VTBIX

VTBIX Risk / Return Rank: 22
VTBIX Sharpe Ratio Rank: 22
VTBIX Sortino Ratio Rank: 23
VTBIX Omega Ratio Rank: 20
VTBIX Calmar Ratio Rank: 24
VTBIX Martin Ratio Rank: 21

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.

SPSK vs. VTBIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SP Funds Dow Jones Global Sukuk ETF (SPSK) and Vanguard Total Bond Market II Index Fund Investor Shares (VTBIX). 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.

	SPSK	VTBIX	Difference
Sharpe ratio: Return per unit of total volatility	0.98	1.32	-0.34
Sortino ratio: Return per unit of downside risk	1.43	2.00	-0.57
Omega ratio: Gain probability vs. loss probability	1.17	1.23	-0.06
Calmar ratio: Return relative to maximum drawdown	1.32	1.82	-0.50
Martin ratio: Return relative to average drawdown	4.43	5.43	-1.00
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SPSK vs. VTBIX - Sharpe Ratio Comparison

The current SPSK Sharpe Ratio is 0.98, which is comparable to the VTBIX Sharpe Ratio of 1.32. The chart below compares the historical Sharpe Ratios of SPSK and VTBIX, 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

	SPSK	VTBIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.98	1.32	-0.34
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.16	0.00	+0.15
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.29	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.20	0.27	-0.07

Drawdowns

SPSK vs. VTBIX - Drawdown Comparison

The maximum SPSK drawdown since its inception was -12.83%, smaller than the maximum VTBIX drawdown of -18.72%. Use the drawdown chart below to compare losses from any high point for SPSK and VTBIX.

Drawdown Indicators

	SPSK	VTBIX	Difference
Max Drawdown Largest peak-to-trough decline	-12.83%	-18.72%	+5.89%
Max Drawdown (1Y) Largest decline over 1 year	-2.85%	-2.84%	-0.01%
Max Drawdown (3Y) Largest decline over 3 years	-3.17%	-5.98%	+2.81%
Max Drawdown (5Y) Largest decline over 5 years	-12.45%	-18.11%	+5.66%
Max Drawdown (10Y) Largest decline over 10 years	—	-18.72%	—
Current Drawdown Current decline from peak	-1.03%	-3.00%	+1.97%
Average Drawdown Average peak-to-trough decline	-3.83%	-4.42%	+0.59%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.84%	0.95%	-0.11%

Volatility

SPSK vs. VTBIX - Volatility Comparison

The current volatility for SP Funds Dow Jones Global Sukuk ETF (SPSK) is 0.96%, while Vanguard Total Bond Market II Index Fund Investor Shares (VTBIX) has a volatility of 1.33%. This indicates that SPSK experiences smaller price fluctuations and is considered to be less risky than VTBIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPSK	VTBIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.96%	1.33%	-0.37%
Volatility (6M) Calculated over the trailing 6-month period	2.46%	2.80%	-0.34%
Volatility (1Y) Calculated over the trailing 1-year period	3.84%	3.91%	-0.07%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.29%	5.95%	-0.66%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.46%	4.92%	+0.54%

SPSK vs. VTBIX - Expense Ratio Comparison

SPSK has a 0.50% expense ratio, which is higher than VTBIX's 0.09% expense ratio.

Dividends

SPSK vs. VTBIX - Dividend Comparison

SPSK's dividend yield for the trailing twelve months is around 4.24%, more than VTBIX's 3.99% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SPSK SP Funds Dow Jones Global Sukuk ETF	4.24%	3.63%	3.53%	2.95%	2.22%	2.56%	1.78%	0.00%	0.00%	0.00%	0.00%	0.00%
VTBIX Vanguard Total Bond Market II Index Fund Investor Shares	3.99%	3.88%	3.70%	2.53%	2.47%	1.75%	3.20%	2.72%	2.51%	2.43%	2.48%	2.64%

Frequently Asked Questions

Can I hold both SPSK and VTBIX in my portfolio?

SPSK and VTBIX have a correlation of 0.56, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SPSK or VTBIX?

VTBIX has higher volatility (1.33%) compared to SPSK (0.96%). In terms of maximum drawdown, SPSK dropped -12.83% vs VTBIX's -18.72%.

Which has better risk-adjusted returns?

VTBIX currently has the higher Sharpe Ratio (1.32 vs 0.98), 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.