OPER vs. BILZ

Last updated Jun 4, 2026

OPER (ClearShares Ultra-Short Maturity ETF) and BILZ (PIMCO Ultra Short Government Active Exchange-Traded Fund) are both Ultrashort Bond funds. OPER is passively managed, while BILZ is actively managed. Over the past year, OPER returned 4.07% vs 3.91% for BILZ. At a 0.39 correlation, their price movements are largely independent. OPER charges 0.20%/yr vs 0.14%/yr for BILZ.

Performance

OPER vs. BILZ - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in ClearShares Ultra-Short Maturity ETF (OPER) and PIMCO Ultra Short Government Active Exchange-Traded Fund (BILZ). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OPER achieves a 1.55% return, which is significantly higher than BILZ's 1.47% return.

OPER

• 1D: 0.01%
• 1M: 0.34%
• YTD: 1.55%
• 6M: 1.88%
• 1Y: 4.07%
• 3Y*: 4.80%
• 5Y*: 3.65%
• 10Y*: —

BILZ

• 1D: 0.00%
• 1M: 0.28%
• YTD: 1.47%
• 6M: 1.76%
• 1Y: 3.91%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

OPER vs. BILZ - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
OPER ClearShares Ultra-Short Maturity ETF	1.55%	4.37%	5.34%	2.81%
BILZ PIMCO Ultra Short Government Active Exchange-Traded Fund	1.47%	4.21%	5.25%	2.33%

Correlation

The correlation between OPER and BILZ is 0.42, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.42
Correlation (All Time) Calculated using the full available price history since Jun 23, 2023	0.39

Return for Risk

OPER vs. BILZ — Risk / Return Rank

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

OPER

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

BILZ

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

OPER vs. BILZ - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for ClearShares Ultra-Short Maturity ETF (OPER) and PIMCO Ultra Short Government Active Exchange-Traded Fund (BILZ). 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.

	OPER	BILZ	Difference
Sharpe ratio: Return per unit of total volatility	15.45	19.09	-3.64
Sortino ratio: Return per unit of downside risk	43.90	125.25	-81.35
Omega ratio: Gain probability vs. loss probability	13.38	53.31	-39.93
Calmar ratio: Return relative to maximum drawdown	61.29	198.55	-137.26
Martin ratio: Return relative to average drawdown	519.55	2,000.92	-1,481.38
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OPER vs. BILZ - Sharpe Ratio Comparison

The current OPER Sharpe Ratio is 15.45, which is comparable to the BILZ Sharpe Ratio of 19.09. The chart below compares the historical Sharpe Ratios of OPER and BILZ, 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

	OPER	BILZ	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	15.45	19.09	-3.64
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	11.47	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.28	10.48	-8.20

Drawdowns

OPER vs. BILZ - Drawdown Comparison

The maximum OPER drawdown since its inception was -2.33%, which is greater than BILZ's maximum drawdown of -0.52%. Use the drawdown chart below to compare losses from any high point for OPER and BILZ.

Drawdown Indicators

	OPER	BILZ	Difference
Max Drawdown Largest peak-to-trough decline	-2.33%	-0.52%	-1.81%
Max Drawdown (1Y) Largest decline over 1 year	-0.07%	-0.02%	-0.05%
Max Drawdown (3Y) Largest decline over 3 years	-0.11%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-0.13%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.16%	-0.01%	-0.15%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.01%	0.00%	+0.01%

Volatility

OPER vs. BILZ - Volatility Comparison

ClearShares Ultra-Short Maturity ETF (OPER) has a higher volatility of 0.10% compared to PIMCO Ultra Short Government Active Exchange-Traded Fund (BILZ) at 0.07%. This indicates that OPER's price experiences larger fluctuations and is considered to be riskier than BILZ based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OPER	BILZ	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.10%	0.07%	+0.03%
Volatility (6M) Calculated over the trailing 6-month period	0.20%	0.14%	+0.06%
Volatility (1Y) Calculated over the trailing 1-year period	0.26%	0.21%	+0.05%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.32%	0.43%	-0.11%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.23%	0.43%	+0.80%

OPER vs. BILZ - Expense Ratio Comparison

OPER has a 0.20% expense ratio, which is higher than BILZ'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

OPER vs. BILZ - Dividend Comparison

OPER's dividend yield for the trailing twelve months is around 4.09%, which matches BILZ's 4.07% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018
BILZ PIMCO Ultra Short Government Active Exchange-Traded Fund	4.07%	4.19%	4.95%	2.23%	0.00%	0.00%	0.00%	0.00%	0.00%
OPER ClearShares Ultra-Short Maturity ETF	4.09%	4.32%	5.21%	5.03%	1.71%	0.36%	0.64%	2.08%	0.89%

Frequently Asked Questions

Can I hold both OPER and BILZ in my portfolio?

OPER and BILZ have a correlation of 0.42, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OPER or BILZ?

OPER has higher volatility (0.10%) compared to BILZ (0.07%). In terms of maximum drawdown, OPER dropped -2.33% vs BILZ's -0.52%.

Which ETF is better, OPER or BILZ?

On 1-year performance, OPER leads with 4.07% vs 3.91% for BILZ. On fees, BILZ 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, OPER or BILZ?

Over the 1-year period, OPER has performed better with a 4.07% return vs 3.91%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, OPER or BILZ?

BILZ is cheaper with a 0.14% expense ratio, compared with 0.20% for OPER.

Which ETF pays a higher dividend yield, OPER or BILZ?

OPER has the higher dividend yield at 4.09%, compared with 4.07% for BILZ.

What is the main difference between OPER and BILZ?

They also come from different issuers: ClearShares and PIMCO. Their fees differ too: 0.20% for OPER and 0.14% for BILZ.

Which has better risk-adjusted returns?

BILZ currently has the higher Sharpe Ratio (19.09 vs 15.45), 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.