SPTU vs. TFLO

Last updated Jun 4, 2026

SPTU (State Street SPDR Portfolio Ultra Short T-Bill ETF) and TFLO (iShares Treasury Floating Rate Bond ETF) are both exchange-traded funds - SPTU is a Ultrashort Bond fund tracking the ICE BofA US Treasury Bill Index, while TFLO is a Government Bonds fund tracking the Bloomberg U.S. Treasury Floating Rate Index. Both are passively managed. At a 0.25 correlation, their price movements are largely independent. SPTU charges 0.05%/yr vs 0.15%/yr for TFLO.

Performance

SPTU vs. TFLO - 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 iShares Treasury Floating Rate Bond ETF (TFLO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SPTU achieves a 1.48% return, which is significantly lower than TFLO's 1.59% return.

SPTU

• 1D: 0.00%
• 1M: 0.31%
• YTD: 1.48%
• 6M: 1.81%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

TFLO

• 1D: 0.02%
• 1M: 0.31%
• YTD: 1.59%
• 6M: 1.92%
• 1Y: 3.97%
• 3Y*: 4.74%
• 5Y*: 3.63%
• 10Y*: 2.37%

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

SPTU vs. TFLO - Yearly Performance Comparison

	2026 (YTD)	2025
SPTU State Street SPDR Portfolio Ultra Short T-Bill ETF	1.48%	0.92%
TFLO iShares Treasury Floating Rate Bond ETF	1.59%	0.96%

Correlation

The correlation between SPTU and TFLO is 0.25, 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 9, 2025	0.25

Return for Risk

SPTU vs. TFLO — Risk / Return Rank

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

TFLO

TFLO Risk / Return Rank: 100
TFLO Sharpe Ratio Rank: 100
TFLO Sortino Ratio Rank: 100
TFLO Omega Ratio Rank: 100
TFLO Calmar Ratio Rank: 100
TFLO Martin Ratio Rank: 100

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. TFLO - 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 iShares Treasury Floating Rate Bond ETF (TFLO). 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	TFLO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	14.09	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	10.30	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	5.21	—
Sharpe Ratio (All Time) Calculated using the full available price history	11.82	0.99	+10.84

Drawdowns

SPTU vs. TFLO - Drawdown Comparison

The maximum SPTU drawdown since its inception was -0.04%, smaller than the maximum TFLO drawdown of -5.01%. Use the drawdown chart below to compare losses from any high point for SPTU and TFLO.

Drawdown Indicators

	SPTU	TFLO	Difference
Max Drawdown Largest peak-to-trough decline	-0.04%	-5.01%	+4.97%
Max Drawdown (1Y) Largest decline over 1 year	—	-0.02%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-0.04%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-0.13%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-0.16%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.00%	-0.10%	+0.10%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.00%	—

Volatility

Volatility by Period

	SPTU	TFLO	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.07%	—
Volatility (6M) Calculated over the trailing 6-month period	—	0.20%	—
Volatility (1Y) Calculated over the trailing 1-year period	0.32%	0.28%	+0.04%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.32%	0.35%	-0.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.32%	0.46%	-0.14%

SPTU vs. TFLO - Expense Ratio Comparison

SPTU has a 0.05% expense ratio, which is lower than TFLO's 0.15% 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. TFLO - Dividend Comparison

SPTU's dividend yield for the trailing twelve months is around 2.36%, less than TFLO's 3.90% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SPTU State Street SPDR Portfolio Ultra Short T-Bill ETF	2.36%	0.89%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
TFLO iShares Treasury Floating Rate Bond ETF	3.90%	4.16%	5.21%	4.88%	1.68%	0.00%	0.36%	2.08%	1.65%	0.86%	0.31%	0.15%

Frequently Asked Questions

Can I hold both SPTU and TFLO in my portfolio?

SPTU and TFLO have a correlation of 0.25, 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 TFLO?

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 TFLO?

SPTU is cheaper with a 0.05% expense ratio, compared with 0.15% for TFLO.

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

TFLO has the higher dividend yield at 3.90%, compared with 2.36% for SPTU.

What is the main difference between SPTU and TFLO?

SPTU is categorized as Ultrashort Bond, while TFLO is Government Bonds. SPTU tracks ICE BofA US Treasury Bill Index, while TFLO tracks Bloomberg U.S. Treasury Floating Rate Index. They also come from different issuers: State Street and iShares. Their fees differ too: 0.05% for SPTU and 0.15% for TFLO.