ZCBG vs. SPTB

Last updated Jun 6, 2026

ZCBG (Global X Zero Coupon Bond 2035 ETF) and SPTB (State Street SPDR Portfolio Treasury ETF) are both Government Bonds funds - ZCBG tracks the FTSE Zero Coupon U.S. Treasury STRIPS 2035 Maturity Index while SPTB tracks the Bloomberg U.S. Treasury Index. Both are passively managed. With a 0.98 correlation, they move nearly in lockstep. ZCBG charges 0.07%/yr vs 0.03%/yr for SPTB.

Performance

ZCBG vs. SPTB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Global X Zero Coupon Bond 2035 ETF (ZCBG) and State Street SPDR Portfolio Treasury ETF (SPTB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

ZCBG

• 1D: -0.61%
• 1M: -1.32%
• 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)

ZCBG vs. SPTB - Yearly Performance Comparison

	2026 (YTD)
ZCBG Global X Zero Coupon Bond 2035 ETF	-1.00%
SPTB State Street SPDR Portfolio Treasury ETF	-0.59%

Correlation

The correlation between ZCBG and SPTB is 0.98 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (All Time) Calculated using the full available price history since Jan 8, 2026	0.98

Return for Risk

ZCBG 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.

ZCBG vs. SPTB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Global X Zero Coupon Bond 2035 ETF (ZCBG) 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

	ZCBG	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	-0.39	0.89	-1.28

Drawdowns

ZCBG vs. SPTB - Drawdown Comparison

The maximum ZCBG drawdown since its inception was -5.11%, roughly equal to the maximum SPTB drawdown of -4.96%. Use the drawdown chart below to compare losses from any high point for ZCBG and SPTB.

Drawdown Indicators

	ZCBG	SPTB	Difference
Max Drawdown Largest peak-to-trough decline	-5.11%	-4.96%	-0.15%
Max Drawdown (1Y) Largest decline over 1 year	—	-2.90%	—
Current Drawdown Current decline from peak	-3.89%	-2.15%	-1.74%
Average Drawdown Average peak-to-trough decline	-1.99%	-1.32%	-0.67%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.99%	—

Volatility

Volatility by Period

	ZCBG	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	6.33%	3.61%	+2.72%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.33%	4.41%	+1.92%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	6.33%	4.41%	+1.92%

ZCBG vs. SPTB - Expense Ratio Comparison

ZCBG 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

ZCBG vs. SPTB - Dividend Comparison

ZCBG's dividend yield for the trailing twelve months is around 1.74%, less than SPTB's 4.21% yield.

Position	TTM	2025	2024
SPTB State Street SPDR Portfolio Treasury ETF	4.21%	4.23%	2.76%
ZCBG Global X Zero Coupon Bond 2035 ETF	1.74%	0.00%	0.00%

Frequently Asked Questions

Can I hold both ZCBG and SPTB in my portfolio?

With a correlation of 0.98, ZCBG 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, ZCBG 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, ZCBG or SPTB?

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

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

SPTB has the higher dividend yield at 4.21%, compared with 1.74% for ZCBG.

What is the main difference between ZCBG and SPTB?

ZCBG tracks FTSE Zero Coupon U.S. Treasury STRIPS 2035 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 ZCBG and 0.03% for SPTB.