SPTU vs. BUXX

Last updated Apr 12, 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 0.09, 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

The year-to-date returns for both investments are quite close, with SPTU having a 0.97% return and BUXX slightly higher at 1.01%.

SPTU

• 1D: 0.02%
• 1M: 0.31%
• YTD: 0.97%
• 6M: 1.86%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

BUXX

• 1D: 0.00%
• 1M: 0.25%
• YTD: 1.01%
• 6M: 1.95%
• 1Y: 4.96%
• 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	0.97%	0.92%
BUXX Strive Enhanced Income Short Maturity ETF	1.01%	0.97%

Correlation

The correlation between SPTU and BUXX is 0.09, 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 9, 2025	0.09

Return for Risk

SPTU vs. BUXX — Risk / Return Rank

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

BUXX

BUXX Risk / Return Rank: 96
BUXX Sharpe Ratio Rank: 91
BUXX Sortino Ratio Rank: 97
BUXX Omega Ratio Rank: 96
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.

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

Sharpe Ratios by Period

	SPTU	BUXX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	3.46	—
Sharpe Ratio (All Time) Calculated using the full available price history	12.12	3.83	+8.29

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	—	-0.39%	—
Current Drawdown Current decline from peak	0.00%	-0.05%	+0.05%
Average Drawdown Average peak-to-trough decline	0.00%	-0.05%	+0.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.09%	—

Volatility

Volatility by Period

	SPTU	BUXX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.37%	—
Volatility (6M) Calculated over the trailing 6-month period	—	0.78%	—
Volatility (1Y) Calculated over the trailing 1-year period	0.32%	1.46%	-1.14%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.32%	1.48%	-1.16%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.32%	1.48%	-1.16%

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 1.76%, less than BUXX's 4.81% yield.

	TTM	2025	2024	2023
SPTU State Street SPDR Portfolio Ultra Short T-Bill ETF	1.76%	0.89%	0.00%	0.00%
BUXX Strive Enhanced Income Short Maturity ETF	4.81%	4.95%	5.55%	1.92%