SPTU vs. BUXX

Last updated Jun 23, 2026

SPTU (State Street SPDR Portfolio Ultra Short T-Bill ETF) and BUXX (Strive Enhanced Income Short Maturity ETF) are both Ultrashort Bond funds. SPTU is passively managed, while BUXX is actively managed. At a 0.07 correlation, their price movements are largely independent. SPTU charges 0.05%/yr vs 0.26%/yr for BUXX.

Performance

SPTU vs. BUXX - Performance Comparison

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

Returns By Period

In the year-to-date period, SPTU achieves a 1.63% return, which is significantly lower than BUXX's 1.81% return.

SPTU

• 1D: -0.01%
• 1M: 0.25%
• YTD: 1.63%
• 6M: 1.75%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

BUXX

• 1D: 0.05%
• 1M: 0.36%
• YTD: 1.81%
• 6M: 1.94%
• 1Y: 4.30%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

SPTU vs. BUXX - Yearly Performance Comparison

	2026 (YTD)	2025
SPTU State Street SPDR Portfolio Ultra Short T-Bill ETF	1.63%	0.87%
BUXX Strive Enhanced Income Short Maturity ETF	1.81%	0.97%

Correlation

The correlation between SPTU and BUXX is 0.07, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (All Time) Calculated using the full available price history since Oct 8, 2025	0.07

Return for Risk

SPTU vs. BUXX — Risk / Return Rank

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

SPTU

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

BUXX

BUXX Risk / Return Rank: 97
BUXX Sharpe Ratio Rank: 95
BUXX Sortino Ratio Rank: 97
BUXX Omega Ratio Rank: 97
BUXX Calmar Ratio Rank: 98
BUXX Martin Ratio Rank: 98

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.

SPTU vs. BUXX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street SPDR Portfolio Ultra Short T-Bill ETF (SPTU) and Strive Enhanced Income Short Maturity ETF (BUXX). 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.

	SPTU	BUXX	Difference
Sharpe ratio: Return per unit of total volatility	—	3.49	—
Sortino ratio: Return per unit of downside risk	—	5.75	—
Omega ratio: Gain probability vs. loss probability	—	1.84	—
Calmar ratio: Return relative to maximum drawdown	—	14.68	—
Martin ratio: Return relative to average drawdown	—	58.03	—

Drawdowns

SPTU vs. BUXX - Drawdown Comparison

The maximum SPTU drawdown since its inception was -0.04%, smaller than the maximum BUXX drawdown of -0.60%. Use the drawdown chart below to compare losses from any high point for SPTU and BUXX.

Drawdown Indicators

	SPTU	BUXX	Difference
Max Drawdown Largest peak-to-trough decline	-0.04%	-0.60%	+0.56%
Max Drawdown (1Y) Largest decline over 1 year	—	-0.29%	—
Current Drawdown Current decline from peak	-0.01%	-0.15%	+0.14%
Average Drawdown Average peak-to-trough decline	-0.00%	-0.05%	+0.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.07%	—

Volatility

Volatility by Period

	SPTU	BUXX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.42%	—
Volatility (6M) Calculated over the trailing 6-month period	—	0.79%	—
Volatility (1Y) Calculated over the trailing 1-year period	0.33%	1.24%	-0.91%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.33%	1.46%	-1.13%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.33%	1.46%	-1.13%

SPTU vs. BUXX - Expense Ratio Comparison

SPTU has a 0.05% expense ratio, which is lower than BUXX's 0.26% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

SPTU vs. BUXX - Dividend Comparison

SPTU's dividend yield for the trailing twelve months is around 2.36%, less than BUXX's 4.72% yield.

Position	TTM	2025	2024	2023
BUXX Strive Enhanced Income Short Maturity ETF	4.72%	4.95%	5.55%	1.92%
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 SPTU and BUXX in my portfolio?

SPTU and BUXX have a correlation of 0.07, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, SPTU or BUXX?

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, SPTU or BUXX?

SPTU is cheaper with a 0.05% expense ratio, compared with 0.26% for BUXX.

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

BUXX has the higher dividend yield at 4.72%, compared with 2.36% for SPTU.

What is the main difference between SPTU and BUXX?

They also come from different issuers: State Street and Strive. Their fees differ too: 0.05% for SPTU and 0.26% for BUXX.