OUSM vs. SEIS

Last updated Jun 4, 2026

OUSM (OShares U.S. Small-Cap Quality Dividend ETF) and SEIS (SEI Select Small Cap ETF) are both Small Cap Blend Equities funds. OUSM is passively managed, while SEIS is actively managed. Over the past year, OUSM returned 10.89% vs 28.28% for SEIS. Their correlation of 0.83 suggests significant overlap in exposure. OUSM charges 0.48%/yr vs 0.55%/yr for SEIS.

Performance

OUSM vs. SEIS - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in OShares U.S. Small-Cap Quality Dividend ETF (OUSM) and SEI Select Small Cap ETF (SEIS). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OUSM achieves a 6.80% return, which is significantly lower than SEIS's 13.79% return.

OUSM

• 1D: -0.06%
• 1M: 1.69%
• YTD: 6.80%
• 6M: 6.94%
• 1Y: 10.89%
• 3Y*: 11.71%
• 5Y*: 7.39%
• 10Y*: —

SEIS

• 1D: -0.66%
• 1M: 2.34%
• YTD: 13.79%
• 6M: 13.11%
• 1Y: 28.28%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

OUSM vs. SEIS - Yearly Performance Comparison

	2026 (YTD)	2025	2024
OUSM OShares U.S. Small-Cap Quality Dividend ETF	6.80%	2.17%	-0.76%
SEIS SEI Select Small Cap ETF	13.79%	9.81%	1.14%

Correlation

The correlation between OUSM and SEIS is 0.81, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.81
Correlation (All Time) Calculated using the full available price history since Oct 11, 2024	0.83

The correlation between OUSM and SEIS has been stable across timeframes, ranging from 0.81 to 0.83 - a consistent structural relationship.

Return for Risk

OUSM vs. SEIS — Risk / Return Rank

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

OUSM

OUSM Risk / Return Rank: 24
OUSM Sharpe Ratio Rank: 23
OUSM Sortino Ratio Rank: 24
OUSM Omega Ratio Rank: 22
OUSM Calmar Ratio Rank: 25
OUSM Martin Ratio Rank: 25

SEIS

SEIS Risk / Return Rank: 47
SEIS Sharpe Ratio Rank: 44
SEIS Sortino Ratio Rank: 45
SEIS Omega Ratio Rank: 41
SEIS Calmar Ratio Rank: 52
SEIS Martin Ratio Rank: 51

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.

OUSM vs. SEIS - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for OShares U.S. Small-Cap Quality Dividend ETF (OUSM) and SEI Select Small Cap ETF (SEIS). 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.

	OUSM	SEIS	Difference
Sharpe ratio: Return per unit of total volatility	0.83	1.50	-0.67
Sortino ratio: Return per unit of downside risk	1.34	2.22	-0.88
Omega ratio: Gain probability vs. loss probability	1.15	1.26	-0.12
Calmar ratio: Return relative to maximum drawdown	1.19	2.54	-1.35
Martin ratio: Return relative to average drawdown	3.47	8.43	-4.95
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OUSM vs. SEIS - Sharpe Ratio Comparison

The current OUSM Sharpe Ratio is 0.83, which is lower than the SEIS Sharpe Ratio of 1.50. The chart below compares the historical Sharpe Ratios of OUSM and SEIS, 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

	OUSM	SEIS	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.83	1.50	-0.67
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.46	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.48	0.70	-0.22

Drawdowns

OUSM vs. SEIS - Drawdown Comparison

The maximum OUSM drawdown since its inception was -39.84%, which is greater than SEIS's maximum drawdown of -26.08%. Use the drawdown chart below to compare losses from any high point for OUSM and SEIS.

Drawdown Indicators

	OUSM	SEIS	Difference
Max Drawdown Largest peak-to-trough decline	-39.84%	-26.08%	-13.76%
Max Drawdown (1Y) Largest decline over 1 year	-9.21%	-11.18%	+1.97%
Max Drawdown (3Y) Largest decline over 3 years	-19.44%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-19.44%	—	—
Current Drawdown Current decline from peak	-1.67%	-0.67%	-1.00%
Average Drawdown Average peak-to-trough decline	-5.22%	-6.00%	+0.78%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.14%	3.36%	-0.22%

Volatility

OUSM vs. SEIS - Volatility Comparison

The current volatility for OShares U.S. Small-Cap Quality Dividend ETF (OUSM) is 3.66%, while SEI Select Small Cap ETF (SEIS) has a volatility of 5.42%. This indicates that OUSM experiences smaller price fluctuations and is considered to be less risky than SEIS based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OUSM	SEIS	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.66%	5.42%	-1.76%
Volatility (6M) Calculated over the trailing 6-month period	9.25%	13.72%	-4.47%
Volatility (1Y) Calculated over the trailing 1-year period	13.15%	18.89%	-5.74%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.30%	22.11%	-5.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.94%	22.11%	-3.17%

OUSM vs. SEIS - Expense Ratio Comparison

OUSM has a 0.48% expense ratio, which is lower than SEIS's 0.55% expense ratio.

Dividends

OUSM vs. SEIS - Dividend Comparison

OUSM's dividend yield for the trailing twelve months is around 2.07%, more than SEIS's 0.37% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
OUSM OShares U.S. Small-Cap Quality Dividend ETF	2.07%	2.09%	1.62%	1.64%	1.98%	1.55%	2.02%	1.99%	2.63%	2.17%
SEIS SEI Select Small Cap ETF	0.37%	0.59%	0.23%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both OUSM and SEIS in my portfolio?

OUSM and SEIS have a correlation of 0.81, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OUSM or SEIS?

SEIS has higher volatility (5.42%) compared to OUSM (3.66%). In terms of maximum drawdown, OUSM dropped -39.84% vs SEIS's -26.08%.

Which ETF is better, OUSM or SEIS?

On 1-year performance, SEIS leads with 28.28% vs 10.89% for OUSM. On fees, OUSM is cheaper at 0.48% per year. On volatility, OUSM has been the lower-risk option at 3.66%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, OUSM or SEIS?

Over the 1-year period, SEIS has performed better with a 28.28% return vs 10.89%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, OUSM or SEIS?

OUSM is cheaper with a 0.48% expense ratio, compared with 0.55% for SEIS.

Which ETF pays a higher dividend yield, OUSM or SEIS?

OUSM has the higher dividend yield at 2.07%, compared with 0.37% for SEIS.

What is the main difference between OUSM and SEIS?

They also come from different issuers: O'Shares Investments and SEI. Their fees differ too: 0.48% for OUSM and 0.55% for SEIS.

Which has better risk-adjusted returns?

SEIS currently has the higher Sharpe Ratio (1.50 vs 0.83), 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.