XBIL vs. BILS

Last updated Jun 23, 2026

XBIL (US Treasury 6 Month Bill ETF) and BILS (SPDR Bloomberg 3-12 Month T-Bill ETF) are both Ultrashort Bond funds - XBIL tracks the ICE BofA US 6-Month Treasury Bill Index - Benchmark TR Gross while BILS tracks the Bloomberg 3-12 Month U.S. Treasury Bill Index. Both are passively managed. Over the past 3 years, XBIL returned 4.59%/yr vs 4.61%/yr for BILS. A 0.58 correlation means they provide meaningful diversification when combined. XBIL charges 0.15%/yr vs 0.14%/yr for BILS.

Performance

XBIL vs. BILS - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in US Treasury 6 Month Bill ETF (XBIL) and SPDR Bloomberg 3-12 Month T-Bill ETF (BILS). 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 XBIL having a 1.56% return and BILS slightly higher at 1.57%.

XBIL

• 1D: -0.01%
• 1M: 0.21%
• YTD: 1.56%
• 6M: 1.65%
• 1Y: 3.84%
• 3Y*: 4.59%
• 5Y*: —
• 10Y*: —

BILS

• 1D: 0.01%
• 1M: 0.24%
• YTD: 1.57%
• 6M: 1.67%
• 1Y: 3.86%
• 3Y*: 4.61%
• 5Y*: 3.33%
• 10Y*: —

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

XBIL vs. BILS - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
XBIL US Treasury 6 Month Bill ETF	1.56%	4.17%	5.16%	4.28%
BILS SPDR Bloomberg 3-12 Month T-Bill ETF	1.57%	4.23%	5.17%	4.25%

Correlation

The correlation between XBIL and BILS is 0.47, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.47
Correlation (3Y) Calculated over the trailing 3-year period	0.54
Correlation (All Time) Calculated using the full available price history since Mar 7, 2023	0.58

The correlation between XBIL and BILS shifts across timeframes, from 0.47 (1 year) to 0.58 (all time), reflecting how their relationship changes across market environments.

Return for Risk

XBIL vs. BILS — Risk / Return Rank

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

XBIL

XBIL Risk / Return Rank: 100
XBIL Sharpe Ratio Rank: 100
XBIL Sortino Ratio Rank: 99
XBIL Omega Ratio Rank: 99
XBIL Calmar Ratio Rank: 99
XBIL Martin Ratio Rank: 100

BILS

BILS Risk / Return Rank: 100
BILS Sharpe Ratio Rank: 100
BILS Sortino Ratio Rank: 100
BILS Omega Ratio Rank: 100
BILS Calmar Ratio Rank: 100
BILS 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.

XBIL vs. BILS - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for US Treasury 6 Month Bill ETF (XBIL) and SPDR Bloomberg 3-12 Month T-Bill ETF (BILS). 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.

	XBIL	BILS	Difference
Sharpe ratio: Return per unit of total volatility	12.61	16.76	-4.15
Sortino ratio: Return per unit of downside risk	38.68	88.16	-49.48
Omega ratio: Gain probability vs. loss probability	10.14	34.42	-24.27
Calmar ratio: Return relative to maximum drawdown	64.36	128.51	-64.15
Martin ratio: Return relative to average drawdown	595.33	1,292.26	-696.93

XBIL vs. BILS - Sharpe Ratio Comparison

The current XBIL Sharpe Ratio is 12.61, which is comparable to the BILS Sharpe Ratio of 16.76. The chart below compares the historical Sharpe Ratios of XBIL and BILS, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

XBIL vs. BILS - Drawdown Comparison

The maximum XBIL drawdown since its inception was -0.08%, smaller than the maximum BILS drawdown of -0.41%. Use the drawdown chart below to compare losses from any high point for XBIL and BILS.

Drawdown Indicators

	XBIL	BILS	Difference
Max Drawdown Largest peak-to-trough decline	-0.08%	-0.41%	+0.33%
Max Drawdown (1Y) Largest decline over 1 year	-0.06%	-0.03%	-0.03%
Max Drawdown (3Y) Largest decline over 3 years	-0.07%	-0.04%	-0.03%
Max Drawdown (5Y) Largest decline over 5 years	—	-0.37%	—
Current Drawdown Current decline from peak	-0.01%	0.00%	-0.01%
Average Drawdown Average peak-to-trough decline	-0.00%	-0.04%	+0.04%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.01%	0.00%	+0.01%

Volatility

XBIL vs. BILS - Volatility Comparison

US Treasury 6 Month Bill ETF (XBIL) has a higher volatility of 0.13% compared to SPDR Bloomberg 3-12 Month T-Bill ETF (BILS) at 0.06%. This indicates that XBIL's price experiences larger fluctuations and is considered to be riskier than BILS based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	XBIL	BILS	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.13%	0.06%	+0.07%
Volatility (6M) Calculated over the trailing 6-month period	0.19%	0.14%	+0.05%
Volatility (1Y) Calculated over the trailing 1-year period	0.31%	0.23%	+0.08%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.38%	0.31%	+0.07%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.38%	0.30%	+0.08%

XBIL vs. BILS - Expense Ratio Comparison

XBIL has a 0.15% expense ratio, which is higher than BILS's 0.14% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

XBIL vs. BILS - Dividend Comparison

XBIL's dividend yield for the trailing twelve months is around 3.77%, less than BILS's 3.81% yield.

Position	TTM	2025	2024	2023	2022
BILS SPDR Bloomberg 3-12 Month T-Bill ETF	3.81%	4.08%	5.01%	4.98%	1.61%
XBIL US Treasury 6 Month Bill ETF	3.77%	4.01%	4.90%	4.30%	0.00%

Frequently Asked Questions

Can I hold both XBIL and BILS in my portfolio?

XBIL and BILS have a correlation of 0.47, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, XBIL or BILS?

XBIL has higher volatility (0.13%) compared to BILS (0.06%). In terms of maximum drawdown, XBIL dropped -0.08% vs BILS's -0.41%.

Which ETF is better, XBIL or BILS?

On 3-year performance, BILS leads with 4.61% vs 4.59% for XBIL. On fees, BILS is cheaper at 0.14% per year. Their volatility is very similar. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, XBIL or BILS?

Over the 3-year period, BILS has performed better with a 4.61% return vs 4.59%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, XBIL or BILS?

BILS is cheaper with a 0.14% expense ratio, compared with 0.15% for XBIL.

Which ETF pays a higher dividend yield, XBIL or BILS?

BILS has the higher dividend yield at 3.81%, compared with 3.77% for XBIL.

What is the main difference between XBIL and BILS?

XBIL tracks ICE BofA US 6-Month Treasury Bill Index - Benchmark TR Gross, while BILS tracks Bloomberg 3-12 Month U.S. Treasury Bill Index. They also come from different issuers: US Benchmark Series and State Street. Their fees differ too: 0.15% for XBIL and 0.14% for BILS.

Which has better risk-adjusted returns?

BILS currently has the higher Sharpe Ratio (16.76 vs 12.61), 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.