IBGM vs. SPTB

Last updated Jun 6, 2026

IBGM (iShares iBonds Dec 2056 Term Treasury ETF) and SPTB (State Street SPDR Portfolio Treasury ETF) are both Government Bonds funds - IBGM tracks the ICE 2056 Maturity US Treasury Index while SPTB tracks the Bloomberg U.S. Treasury Index. Both are passively managed. Their correlation of 0.89 suggests significant overlap in exposure. IBGM charges 0.07%/yr vs 0.03%/yr for SPTB.

Performance

IBGM vs. SPTB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares iBonds Dec 2056 Term Treasury ETF (IBGM) and State Street SPDR Portfolio Treasury ETF (SPTB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

IBGM

• 1D: -0.49%
• 1M: -0.74%
• 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)

IBGM vs. SPTB - Yearly Performance Comparison

	2026 (YTD)
IBGM iShares iBonds Dec 2056 Term Treasury ETF	-0.16%
SPTB State Street SPDR Portfolio Treasury ETF	0.20%

Correlation

The correlation between IBGM and SPTB is 0.89, 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 Mar 27, 2026	0.89

Return for Risk

IBGM 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.

IBGM vs. SPTB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Dec 2056 Term Treasury ETF (IBGM) 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

	IBGM	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	-0.10	0.89	-0.99

Drawdowns

IBGM vs. SPTB - Drawdown Comparison

The maximum IBGM drawdown since its inception was -4.36%, smaller than the maximum SPTB drawdown of -4.96%. Use the drawdown chart below to compare losses from any high point for IBGM and SPTB.

Drawdown Indicators

	IBGM	SPTB	Difference
Max Drawdown Largest peak-to-trough decline	-4.36%	-4.96%	+0.60%
Max Drawdown (1Y) Largest decline over 1 year	—	-2.90%	—
Current Drawdown Current decline from peak	-1.59%	-2.15%	+0.56%
Average Drawdown Average peak-to-trough decline	-1.26%	-1.32%	+0.06%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.99%	—

Volatility

Volatility by Period

	IBGM	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	8.27%	3.61%	+4.66%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	8.27%	4.41%	+3.86%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	8.27%	4.41%	+3.86%

IBGM vs. SPTB - Expense Ratio Comparison

IBGM 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

IBGM vs. SPTB - Dividend Comparison

IBGM's dividend yield for the trailing twelve months is around 0.82%, less than SPTB's 4.21% yield.

Position	TTM	2025	2024
IBGM iShares iBonds Dec 2056 Term Treasury ETF	0.82%	0.00%	0.00%
SPTB State Street SPDR Portfolio Treasury ETF	4.21%	4.23%	2.76%

Frequently Asked Questions

Can I hold both IBGM and SPTB in my portfolio?

IBGM and SPTB have a correlation of 0.89, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, IBGM 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, IBGM or SPTB?

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

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

SPTB has the higher dividend yield at 4.21%, compared with 0.82% for IBGM.

What is the main difference between IBGM and SPTB?

IBGM tracks ICE 2056 Maturity US Treasury Index, while SPTB tracks Bloomberg U.S. Treasury Index. They also come from different issuers: iShares and State Street. Their fees differ too: 0.07% for IBGM and 0.03% for SPTB.