ZCBB vs. SPTB

Last updated Jun 6, 2026

ZCBB (Global X Zero Coupon Bond 2031 ETF) and SPTB (State Street SPDR Portfolio Treasury ETF) are both Government Bonds funds - ZCBB tracks the FTSE Zero Coupon U.S. Treasury STRIPS 2031 Maturity Index while SPTB tracks the Bloomberg U.S. Treasury Index. Both are passively managed. Their correlation of 0.95 suggests significant overlap in exposure. ZCBB charges 0.07%/yr vs 0.03%/yr for SPTB.

Performance

ZCBB vs. SPTB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Global X Zero Coupon Bond 2031 ETF (ZCBB) and State Street SPDR Portfolio Treasury ETF (SPTB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

ZCBB

• 1D: -0.46%
• 1M: -1.07%
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

SPTB

• 1D: -0.32%
• 1M: -0.65%
• YTD: -0.28%
• 6M: -0.14%
• 1Y: 3.19%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

ZCBB vs. SPTB - Yearly Performance Comparison

	2026 (YTD)
ZCBB Global X Zero Coupon Bond 2031 ETF	-0.80%
SPTB State Street SPDR Portfolio Treasury ETF	-0.59%

Correlation

The correlation between ZCBB and SPTB is 0.95, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (All Time) Calculated using the full available price history since Jan 8, 2026	0.95

Return for Risk

ZCBB vs. SPTB — Risk / Return Rank

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

SPTB

SPTB Risk / Return Rank: 25
SPTB Sharpe Ratio Rank: 27
SPTB Sortino Ratio Rank: 26
SPTB Omega Ratio Rank: 24
SPTB Calmar Ratio Rank: 25
SPTB Martin Ratio Rank: 25

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.

ZCBB vs. SPTB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Global X Zero Coupon Bond 2031 ETF (ZCBB) and State Street SPDR Portfolio Treasury ETF (SPTB). 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.

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

Sharpe Ratios by Period

	ZCBB	SPTB	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	0.89	—
Sharpe Ratio (All Time) Calculated using the full available price history	-0.51	0.89	-1.40

Drawdowns

ZCBB vs. SPTB - Drawdown Comparison

The maximum ZCBB drawdown since its inception was -3.05%, smaller than the maximum SPTB drawdown of -4.96%. Use the drawdown chart below to compare losses from any high point for ZCBB and SPTB.

Drawdown Indicators

	ZCBB	SPTB	Difference
Max Drawdown Largest peak-to-trough decline	-3.05%	-4.96%	+1.91%
Max Drawdown (1Y) Largest decline over 1 year	—	-2.90%	—
Current Drawdown Current decline from peak	-2.65%	-2.15%	-0.50%
Average Drawdown Average peak-to-trough decline	-1.25%	-1.32%	+0.07%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.99%	—

Volatility

Volatility by Period

	ZCBB	SPTB	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	1.08%	—
Volatility (6M) Calculated over the trailing 6-month period	—	2.48%	—
Volatility (1Y) Calculated over the trailing 1-year period	3.87%	3.61%	+0.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.87%	4.41%	-0.54%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.87%	4.41%	-0.54%

ZCBB vs. SPTB - Expense Ratio Comparison

ZCBB has a 0.07% expense ratio, which is higher than SPTB's 0.03% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

ZCBB vs. SPTB - Dividend Comparison

ZCBB's dividend yield for the trailing twelve months is around 1.56%, less than SPTB's 4.21% yield.

Position	TTM	2025	2024
SPTB State Street SPDR Portfolio Treasury ETF	4.21%	4.23%	2.76%
ZCBB Global X Zero Coupon Bond 2031 ETF	1.56%	0.00%	0.00%

Frequently Asked Questions

Can I hold both ZCBB and SPTB in my portfolio?

With a correlation of 0.95, ZCBB and SPTB 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 ETF is better, ZCBB or SPTB?

On fees, SPTB is cheaper at 0.03% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, ZCBB or SPTB?

SPTB is cheaper with a 0.03% expense ratio, compared with 0.07% for ZCBB.

Which ETF pays a higher dividend yield, ZCBB or SPTB?

SPTB has the higher dividend yield at 4.21%, compared with 1.56% for ZCBB.

What is the main difference between ZCBB and SPTB?

ZCBB tracks FTSE Zero Coupon U.S. Treasury STRIPS 2031 Maturity Index, while SPTB tracks Bloomberg U.S. Treasury Index. They also come from different issuers: Global X and State Street. Their fees differ too: 0.07% for ZCBB and 0.03% for SPTB.