SEA vs. OPER

Last updated Jun 23, 2026

SEA (U.S. Global Sea to Sky Cargo ETF) and OPER (ClearShares Ultra-Short Maturity ETF) are both exchange-traded funds - SEA is a Industrials Equities fund tracking the U.S. Global Sea to Sky Cargo Index - Benchmark TR Gross, while OPER is a Ultrashort Bond fund tracking the ICE BofA U.S. Broad Market Index. Both are passively managed. Over the past 3 years, SEA returned 19.15%/yr vs 4.76%/yr for OPER. At a correlation of -0.01, they often move in opposite directions. SEA charges 0.60%/yr vs 0.20%/yr for OPER.

Performance

SEA vs. OPER - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in U.S. Global Sea to Sky Cargo ETF (SEA) and ClearShares Ultra-Short Maturity ETF (OPER). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SEA achieves a 20.42% return, which is significantly higher than OPER's 1.72% return.

SEA

• 1D: 2.29%
• 1M: -1.41%
• YTD: 20.42%
• 6M: 20.07%
• 1Y: 30.14%
• 3Y*: 19.15%
• 5Y*: —
• 10Y*: —

OPER

• 1D: -0.01%
• 1M: 0.29%
• YTD: 1.72%
• 6M: 1.82%
• 1Y: 4.04%
• 3Y*: 4.76%
• 5Y*: 3.68%
• 10Y*: —

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

SEA vs. OPER - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
SEA U.S. Global Sea to Sky Cargo ETF	20.42%	16.78%	2.52%	19.33%	-18.36%
OPER ClearShares Ultra-Short Maturity ETF	1.72%	4.37%	5.34%	5.09%	1.74%

Correlation

The correlation between SEA and OPER is -0.08, 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 (1Y) Calculated over the trailing 1-year period	-0.08
Correlation (3Y) Calculated over the trailing 3-year period	-0.00
Correlation (All Time) Calculated using the full available price history since Jan 20, 2022	-0.01

Return for Risk

SEA vs. OPER — Risk / Return Rank

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

SEA

SEA Risk / Return Rank: 57
SEA Sharpe Ratio Rank: 56
SEA Sortino Ratio Rank: 56
SEA Omega Ratio Rank: 52
SEA Calmar Ratio Rank: 59
SEA Martin Ratio Rank: 65

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: 99
OPER 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.

SEA vs. OPER - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for U.S. Global Sea to Sky Cargo ETF (SEA) and ClearShares Ultra-Short Maturity ETF (OPER). 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.

	SEA	OPER	Difference
Sharpe ratio: Return per unit of total volatility	1.83	14.80	-12.97
Sortino ratio: Return per unit of downside risk	2.60	42.88	-40.29
Omega ratio: Gain probability vs. loss probability	1.32	12.57	-11.25
Calmar ratio: Return relative to maximum drawdown	2.84	60.74	-57.90
Martin ratio: Return relative to average drawdown	11.45	510.87	-499.42

SEA vs. OPER - Sharpe Ratio Comparison

The current SEA Sharpe Ratio is 1.83, which is lower than the OPER Sharpe Ratio of 14.80. The chart below compares the historical Sharpe Ratios of SEA and OPER, 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

SEA vs. OPER - Drawdown Comparison

The maximum SEA drawdown since its inception was -39.53%, which is greater than OPER's maximum drawdown of -2.33%. Use the drawdown chart below to compare losses from any high point for SEA and OPER.

Drawdown Indicators

	SEA	OPER	Difference
Max Drawdown Largest peak-to-trough decline	-39.53%	-2.33%	-37.20%
Max Drawdown (1Y) Largest decline over 1 year	-10.67%	-0.07%	-10.60%
Max Drawdown (3Y) Largest decline over 3 years	-32.42%	-0.11%	-32.31%
Max Drawdown (5Y) Largest decline over 5 years	—	-0.13%	—
Current Drawdown Current decline from peak	-3.36%	-0.01%	-3.35%
Average Drawdown Average peak-to-trough decline	-14.18%	-0.16%	-14.02%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.64%	0.01%	+2.63%

Volatility

SEA vs. OPER - Volatility Comparison

U.S. Global Sea to Sky Cargo ETF (SEA) has a higher volatility of 5.27% compared to ClearShares Ultra-Short Maturity ETF (OPER) at 0.10%. This indicates that SEA's price experiences larger fluctuations and is considered to be riskier than OPER based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SEA	OPER	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.27%	0.10%	+5.17%
Volatility (6M) Calculated over the trailing 6-month period	12.56%	0.21%	+12.35%
Volatility (1Y) Calculated over the trailing 1-year period	16.56%	0.27%	+16.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.65%	0.32%	+21.33%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.65%	1.23%	+20.42%

SEA vs. OPER - Expense Ratio Comparison

SEA has a 0.60% expense ratio, which is higher than OPER's 0.20% expense ratio.

Dividends

SEA vs. OPER - Dividend Comparison

SEA's dividend yield for the trailing twelve months is around 5.61%, more than OPER's 4.08% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018
OPER ClearShares Ultra-Short Maturity ETF	4.08%	4.32%	5.21%	5.03%	1.71%	0.36%	0.64%	2.08%	0.89%
SEA U.S. Global Sea to Sky Cargo ETF	5.61%	6.76%	18.47%	9.85%	18.73%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both SEA and OPER in my portfolio?

SEA and OPER have a correlation of -0.08, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SEA or OPER?

SEA has higher volatility (5.27%) compared to OPER (0.10%). In terms of maximum drawdown, SEA dropped -39.53% vs OPER's -2.33%.

Which ETF is better, SEA or OPER?

On 3-year performance, SEA leads with 19.15% vs 4.76% for OPER. On fees, OPER is cheaper at 0.20% per year. On volatility, OPER has been the lower-risk option at 0.10%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, SEA or OPER?

Over the 3-year period, SEA has performed better with a 19.15% return vs 4.76%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, SEA or OPER?

OPER is cheaper with a 0.20% expense ratio, compared with 0.60% for SEA.

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

SEA has the higher dividend yield at 5.61%, compared with 4.08% for OPER.

What is the main difference between SEA and OPER?

SEA is categorized as Industrials Equities, while OPER is Ultrashort Bond. SEA tracks U.S. Global Sea to Sky Cargo Index - Benchmark TR Gross, while OPER tracks ICE BofA U.S. Broad Market Index. They also come from different issuers: US Global and ClearShares. Their fees differ too: 0.60% for SEA and 0.20% for OPER.

Which has better risk-adjusted returns?

OPER currently has the higher Sharpe Ratio (14.80 vs 1.83), 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.