OIH vs. MDST

Last updated Jun 4, 2026

OIH (VanEck Vectors Oil Services ETF) and MDST (Westwood Salient Enhanced Midstream Income ETF) are both Energy Equities funds. OIH is passively managed, while MDST is actively managed. Over the past year, OIH returned 92.96% vs 17.62% for MDST. At a 0.47 correlation, their price movements are largely independent. OIH charges 0.35%/yr vs 0.80%/yr for MDST.

Performance

OIH vs. MDST - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in VanEck Vectors Oil Services ETF (OIH) and Westwood Salient Enhanced Midstream Income ETF (MDST). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OIH achieves a 51.43% return, which is significantly higher than MDST's 14.94% return.

OIH

• 1D: 0.18%
• 1M: -2.77%
• YTD: 51.43%
• 6M: 43.87%
• 1Y: 92.96%
• 3Y*: 18.56%
• 5Y*: 13.62%
• 10Y*: -0.90%

MDST

• 1D: 0.14%
• 1M: -0.74%
• YTD: 14.94%
• 6M: 14.77%
• 1Y: 17.62%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

OIH vs. MDST - Yearly Performance Comparison

	2026 (YTD)	2025	2024
OIH VanEck Vectors Oil Services ETF	51.43%	6.81%	-19.60%
MDST Westwood Salient Enhanced Midstream Income ETF	14.94%	7.09%	17.29%

Correlation

The correlation between OIH and MDST is 0.35, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.35
Correlation (All Time) Calculated using the full available price history since Apr 10, 2024	0.47

The correlation between OIH and MDST shifts across timeframes, from 0.35 (1 year) to 0.47 (all time), reflecting how their relationship changes across market environments.

OIH vs. MDST - Sectors Allocation Comparison

Sectors	OIH	MDST
Energy	98.0%	100.0%
Utilities	1.8%	-
Basic Materials	-	-
Communication Services	-	-
Consumer Cyclical	-	-
Consumer Defensive	-	-
Financial Services	-	-
Healthcare	-	-
Industrials	-	-
Real Estate	-	-
Technology	-	-

Return for Risk

OIH vs. MDST — Risk / Return Rank

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

OIH

OIH Risk / Return Rank: 89
OIH Sharpe Ratio Rank: 90
OIH Sortino Ratio Rank: 85
OIH Omega Ratio Rank: 79
OIH Calmar Ratio Rank: 96
OIH Martin Ratio Rank: 93

MDST

MDST Risk / Return Rank: 44
MDST Sharpe Ratio Rank: 41
MDST Sortino Ratio Rank: 42
MDST Omega Ratio Rank: 41
MDST Calmar Ratio Rank: 53
MDST Martin Ratio Rank: 45

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.

OIH vs. MDST - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for VanEck Vectors Oil Services ETF (OIH) and Westwood Salient Enhanced Midstream Income ETF (MDST). 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.

	OIH	MDST	Difference
Sharpe ratio: Return per unit of total volatility	3.19	1.47	+1.72
Sortino ratio: Return per unit of downside risk	3.87	2.13	+1.75
Omega ratio: Gain probability vs. loss probability	1.48	1.27	+0.21
Calmar ratio: Return relative to maximum drawdown	9.80	2.63	+7.17
Martin ratio: Return relative to average drawdown	24.42	7.46	+16.96
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OIH vs. MDST - Sharpe Ratio Comparison

The current OIH Sharpe Ratio is 3.19, which is higher than the MDST Sharpe Ratio of 1.47. The chart below compares the historical Sharpe Ratios of OIH and MDST, 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

	OIH	MDST	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.19	1.47	+1.72
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.37	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.02	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.01	1.16	-1.16

Drawdowns

OIH vs. MDST - Drawdown Comparison

The maximum OIH drawdown since its inception was -94.45%, which is greater than MDST's maximum drawdown of -14.19%. Use the drawdown chart below to compare losses from any high point for OIH and MDST.

Drawdown Indicators

	OIH	MDST	Difference
Max Drawdown Largest peak-to-trough decline	-94.45%	-14.19%	-80.26%
Max Drawdown (1Y) Largest decline over 1 year	-9.54%	-6.74%	-2.80%
Max Drawdown (3Y) Largest decline over 3 years	-43.80%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-43.80%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-89.62%	—	—
Current Drawdown Current decline from peak	-61.60%	-3.53%	-58.07%
Average Drawdown Average peak-to-trough decline	-48.84%	-2.17%	-46.67%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.82%	2.37%	+1.45%

Volatility

OIH vs. MDST - Volatility Comparison

VanEck Vectors Oil Services ETF (OIH) has a higher volatility of 7.95% compared to Westwood Salient Enhanced Midstream Income ETF (MDST) at 4.87%. This indicates that OIH's price experiences larger fluctuations and is considered to be riskier than MDST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OIH	MDST	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.95%	4.87%	+3.08%
Volatility (6M) Calculated over the trailing 6-month period	20.36%	8.36%	+12.00%
Volatility (1Y) Calculated over the trailing 1-year period	29.49%	12.12%	+17.37%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	36.79%	16.11%	+20.68%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	42.41%	16.11%	+26.30%

OIH vs. MDST - Expense Ratio Comparison

OIH has a 0.35% expense ratio, which is lower than MDST's 0.80% expense ratio.

Dividends

OIH vs. MDST - Dividend Comparison

OIH's dividend yield for the trailing twelve months is around 1.13%, less than MDST's 9.33% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MDST Westwood Salient Enhanced Midstream Income ETF	9.33%	10.22%	6.60%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
OIH VanEck Vectors Oil Services ETF	1.13%	1.71%	2.01%	1.36%	0.95%	0.98%	1.23%	2.10%	2.13%	2.60%	1.40%	2.39%

Frequently Asked Questions

Can I hold both OIH and MDST in my portfolio?

OIH and MDST have a correlation of 0.35, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OIH or MDST?

OIH has higher volatility (7.95%) compared to MDST (4.87%). In terms of maximum drawdown, OIH dropped -94.45% vs MDST's -14.19%.

Which ETF is better, OIH or MDST?

On 1-year performance, OIH leads with 92.96% vs 17.62% for MDST. On fees, OIH is cheaper at 0.35% per year. On volatility, MDST has been the lower-risk option at 4.87%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, OIH or MDST?

Over the 1-year period, OIH has performed better with a 92.96% return vs 17.62%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, OIH or MDST?

OIH is cheaper with a 0.35% expense ratio, compared with 0.80% for MDST.

Which ETF pays a higher dividend yield, OIH or MDST?

MDST has the higher dividend yield at 9.33%, compared with 1.13% for OIH.

What is the main difference between OIH and MDST?

They also come from different issuers: VanEck and Westwood. Their fees differ too: 0.35% for OIH and 0.80% for MDST.

Which has better risk-adjusted returns?

OIH currently has the higher Sharpe Ratio (3.19 vs 1.47), 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.