BAMU vs. SPTU

Last updated Jun 25, 2026

BAMU (Brookstone Ultra-Short Bond ETF) and SPTU (State Street SPDR Portfolio Ultra Short T-Bill ETF) are both Ultrashort Bond funds. BAMU is actively managed, while SPTU is passively managed. At a 0.13 correlation, their price movements are largely independent. BAMU charges 1.09%/yr vs 0.05%/yr for SPTU.

Performance

BAMU vs. SPTU - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Brookstone Ultra-Short Bond ETF (BAMU) and State Street SPDR Portfolio Ultra Short T-Bill ETF (SPTU). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BAMU achieves a 1.20% return, which is significantly lower than SPTU's 1.68% return.

BAMU

• 1D: 0.02%
• 1M: 0.18%
• YTD: 1.20%
• 6M: 1.27%
• 1Y: 2.89%
• 3Y*: —
• 5Y*: —
• 10Y*: —

SPTU

• 1D: 0.02%
• 1M: 0.31%
• YTD: 1.68%
• 6M: 1.76%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

BAMU vs. SPTU - Yearly Performance Comparison

	2026 (YTD)	2025
BAMU Brookstone Ultra-Short Bond ETF	1.20%	0.63%
SPTU State Street SPDR Portfolio Ultra Short T-Bill ETF	1.68%	0.87%

Correlation

The correlation between BAMU and SPTU is 0.13, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (All Time) Calculated using the full available price history since Oct 8, 2025	0.13

Return for Risk

BAMU vs. SPTU — Risk / Return Rank

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

BAMU

BAMU Risk / Return Rank: 99
BAMU Sharpe Ratio Rank: 98
BAMU Sortino Ratio Rank: 98
BAMU Omega Ratio Rank: 98
BAMU Calmar Ratio Rank: 99
BAMU Martin Ratio Rank: 99

SPTU

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

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.

BAMU vs. SPTU - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Brookstone Ultra-Short Bond ETF (BAMU) and State Street SPDR Portfolio Ultra Short T-Bill ETF (SPTU). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	BAMU	SPTU	Difference
Sharpe ratio: Return per unit of total volatility	4.98	—	—
Sortino ratio: Return per unit of downside risk	8.77	—	—
Omega ratio: Gain probability vs. loss probability	2.42	—	—
Calmar ratio: Return relative to maximum drawdown	24.55	—	—
Martin ratio: Return relative to average drawdown	97.21	—	—

Drawdowns

BAMU vs. SPTU - Drawdown Comparison

The maximum BAMU drawdown since its inception was -0.36%, which is greater than SPTU's maximum drawdown of -0.04%. Use the drawdown chart below to compare losses from any high point for BAMU and SPTU.

Drawdown Indicators

	BAMU	SPTU	Difference
Max Drawdown Largest peak-to-trough decline	-0.36%	-0.04%	-0.32%
Max Drawdown (1Y) Largest decline over 1 year	-0.12%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.02%	-0.00%	-0.02%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.03%	—	—

Volatility

Volatility by Period

	BAMU	SPTU	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.08%	—	—
Volatility (6M) Calculated over the trailing 6-month period	0.39%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	0.58%	0.32%	+0.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.86%	0.32%	+0.54%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.86%	0.32%	+0.54%

BAMU vs. SPTU - Expense Ratio Comparison

BAMU has a 1.09% expense ratio, which is higher than SPTU's 0.05% expense ratio.

Dividends

BAMU vs. SPTU - Dividend Comparison

BAMU's dividend yield for the trailing twelve months is around 3.05%, more than SPTU's 2.36% yield.

Position	TTM	2025	2024	2023
BAMU Brookstone Ultra-Short Bond ETF	3.05%	3.20%	3.97%	0.84%
SPTU State Street SPDR Portfolio Ultra Short T-Bill ETF	2.36%	0.89%	0.00%	0.00%

Frequently Asked Questions

Can I hold both BAMU and SPTU in my portfolio?

BAMU and SPTU have a correlation of 0.13, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, BAMU or SPTU?

On fees, SPTU is cheaper at 0.05% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, BAMU or SPTU?

SPTU is cheaper with a 0.05% expense ratio, compared with 1.09% for BAMU.

Which ETF pays a higher dividend yield, BAMU or SPTU?

BAMU has the higher dividend yield at 3.05%, compared with 2.36% for SPTU.

What is the main difference between BAMU and SPTU?

They also come from different issuers: Brookstone and State Street. Their fees differ too: 1.09% for BAMU and 0.05% for SPTU.