SPYA vs. BAMU

Last updated Jun 6, 2026

SPYA (Twin Oak Endure ETF) and BAMU (Brookstone Ultra-Short Bond ETF) are both exchange-traded funds - SPYA is a Equity Hedged fund actively managed by Twin Oak, while BAMU is a Ultrashort Bond fund actively managed by Brookstone. Both are actively managed. Over the past year, SPYA returned 17.32% vs 2.97% for BAMU. At a correlation of -0.14, they often move in opposite directions. SPYA charges 0.49%/yr vs 1.09%/yr for BAMU.

Performance

SPYA vs. BAMU - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Twin Oak Endure ETF (SPYA) and Brookstone Ultra-Short Bond ETF (BAMU). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SPYA achieves a 5.79% return, which is significantly higher than BAMU's 1.10% return.

SPYA

• 1D: -2.44%
• 1M: 0.54%
• YTD: 5.79%
• 6M: 5.38%
• 1Y: 17.32%
• 3Y*: —
• 5Y*: —
• 10Y*: —

BAMU

• 1D: 0.02%
• 1M: 0.24%
• YTD: 1.10%
• 6M: 1.29%
• 1Y: 2.97%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

SPYA vs. BAMU - Yearly Performance Comparison

	2026 (YTD)	2025
SPYA Twin Oak Endure ETF	5.79%	11.69%
BAMU Brookstone Ultra-Short Bond ETF	1.10%	1.85%

Correlation

The correlation between SPYA and BAMU is -0.14, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.14
Correlation (All Time) Calculated using the full available price history since Jun 4, 2025	-0.14

Return for Risk

SPYA vs. BAMU — Risk / Return Rank

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

SPYA

SPYA Risk / Return Rank: 45
SPYA Sharpe Ratio Rank: 48
SPYA Sortino Ratio Rank: 46
SPYA Omega Ratio Rank: 47
SPYA Calmar Ratio Rank: 40
SPYA Martin Ratio Rank: 47

BAMU

BAMU Risk / Return Rank: 98
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

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.

SPYA vs. BAMU - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Twin Oak Endure ETF (SPYA) and Brookstone Ultra-Short Bond ETF (BAMU). 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.

	SPYA	BAMU	Difference
Sharpe ratio: Return per unit of total volatility	1.53	5.05	-3.52
Sortino ratio: Return per unit of downside risk	2.12	8.89	-6.77
Omega ratio: Gain probability vs. loss probability	1.27	2.43	-1.15
Calmar ratio: Return relative to maximum drawdown	1.83	25.24	-23.41
Martin ratio: Return relative to average drawdown	7.18	99.25	-92.07
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SPYA vs. BAMU - Sharpe Ratio Comparison

The current SPYA Sharpe Ratio is 1.53, which is lower than the BAMU Sharpe Ratio of 5.05. The chart below compares the historical Sharpe Ratios of SPYA and BAMU, 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

	SPYA	BAMU	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.53	5.05	-3.52
Sharpe Ratio (All Time) Calculated using the full available price history	1.59	4.15	-2.56

Drawdowns

SPYA vs. BAMU - Drawdown Comparison

The maximum SPYA drawdown since its inception was -9.51%, which is greater than BAMU's maximum drawdown of -0.36%. Use the drawdown chart below to compare losses from any high point for SPYA and BAMU.

Drawdown Indicators

	SPYA	BAMU	Difference
Max Drawdown Largest peak-to-trough decline	-9.51%	-0.36%	-9.15%
Max Drawdown (1Y) Largest decline over 1 year	-9.51%	-0.12%	-9.39%
Current Drawdown Current decline from peak	-2.74%	0.00%	-2.74%
Average Drawdown Average peak-to-trough decline	-1.45%	-0.02%	-1.43%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.42%	0.03%	+2.39%

Volatility

SPYA vs. BAMU - Volatility Comparison

Twin Oak Endure ETF (SPYA) has a higher volatility of 3.66% compared to Brookstone Ultra-Short Bond ETF (BAMU) at 0.07%. This indicates that SPYA's price experiences larger fluctuations and is considered to be riskier than BAMU based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPYA	BAMU	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.66%	0.07%	+3.59%
Volatility (6M) Calculated over the trailing 6-month period	8.88%	0.43%	+8.45%
Volatility (1Y) Calculated over the trailing 1-year period	11.38%	0.59%	+10.79%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	11.39%	0.87%	+10.52%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	11.39%	0.87%	+10.52%

SPYA vs. BAMU - Expense Ratio Comparison

SPYA has a 0.49% expense ratio, which is lower than BAMU's 1.09% expense ratio.

Dividends

SPYA vs. BAMU - Dividend Comparison

SPYA's dividend yield for the trailing twelve months is around 0.35%, less than BAMU's 3.06% yield.

Position	TTM	2025	2024	2023
BAMU Brookstone Ultra-Short Bond ETF	3.06%	3.20%	3.97%	0.84%
SPYA Twin Oak Endure ETF	0.35%	0.37%	0.00%	0.00%

Frequently Asked Questions

Can I hold both SPYA and BAMU in my portfolio?

SPYA and BAMU have a correlation of -0.14, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SPYA or BAMU?

SPYA has higher volatility (3.66%) compared to BAMU (0.07%). In terms of maximum drawdown, SPYA dropped -9.51% vs BAMU's -0.36%.

Which ETF is better, SPYA or BAMU?

On 1-year performance, SPYA leads with 17.32% vs 2.97% for BAMU. On fees, SPYA is cheaper at 0.49% per year. On volatility, BAMU has been the lower-risk option at 0.07%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, SPYA or BAMU?

Over the 1-year period, SPYA has performed better with a 17.32% return vs 2.97%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, SPYA or BAMU?

SPYA is cheaper with a 0.49% expense ratio, compared with 1.09% for BAMU.

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

BAMU has the higher dividend yield at 3.06%, compared with 0.35% for SPYA.

What is the main difference between SPYA and BAMU?

SPYA is categorized as Equity Hedged, while BAMU is Ultrashort Bond. They also come from different issuers: Twin Oak and Brookstone. Their fees differ too: 0.49% for SPYA and 1.09% for BAMU.

Which has better risk-adjusted returns?

BAMU currently has the higher Sharpe Ratio (5.05 vs 1.53), 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.