VTBIX vs. SPSK

Last updated Jun 4, 2026

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

Performance

VTBIX vs. SPSK - Performance Comparison

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

Returns By Period

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

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%

SPSK

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

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

VTBIX vs. SPSK - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
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%
SPSK SP Funds Dow Jones Global Sukuk ETF	0.03%	6.16%	2.95%	3.95%	-7.75%	-1.30%	3.67%	0.02%

Correlation

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

Return for Risk

VTBIX vs. SPSK — Risk / Return Rank

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

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

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

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.

VTBIX vs. SPSK - Risk-Adjusted Trends Comparison

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

	VTBIX	SPSK	Difference
Sharpe ratio: Return per unit of total volatility	1.32	0.98	+0.34
Sortino ratio: Return per unit of downside risk	2.00	1.43	+0.57
Omega ratio: Gain probability vs. loss probability	1.23	1.17	+0.06
Calmar ratio: Return relative to maximum drawdown	1.82	1.32	+0.50
Martin ratio: Return relative to average drawdown	5.43	4.43	+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.

VTBIX vs. SPSK - Sharpe Ratio Comparison

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

	VTBIX	SPSK	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.32	0.98	+0.34
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.00	0.16	-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	0.27	0.20	+0.07

Drawdowns

VTBIX vs. SPSK - Drawdown Comparison

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

Drawdown Indicators

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

Volatility

VTBIX vs. SPSK - Volatility Comparison

Vanguard Total Bond Market II Index Fund Investor Shares (VTBIX) has a higher volatility of 1.33% compared to SP Funds Dow Jones Global Sukuk ETF (SPSK) at 0.96%. This indicates that VTBIX's price experiences larger fluctuations and is considered to be riskier than SPSK based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

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

VTBIX vs. SPSK - Expense Ratio Comparison

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

Dividends

VTBIX vs. SPSK - Dividend Comparison

VTBIX's dividend yield for the trailing twelve months is around 3.99%, less than SPSK's 4.24% 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 VTBIX and SPSK in my portfolio?

VTBIX and SPSK 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, VTBIX or SPSK?

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

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.