IDU vs. RSPU

Last updated Jun 26, 2026

IDU (iShares U.S. Utilities ETF) and RSPU (Invesco S&P 500 Equal Weight Utilities ETF) are both Utilities Equities funds - IDU tracks the Dow Jones U.S. Utilities Index while RSPU tracks the S&P 500 Equal Weighted / Utilities Plus. Both are passively managed. Over the past 10 years, IDU returned 9.02%/yr vs 9.89%/yr for RSPU. Their correlation of 0.89 suggests significant overlap in exposure. IDU charges 0.42%/yr vs 0.40%/yr for RSPU.

Performance

IDU vs. RSPU - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares U.S. Utilities ETF (IDU) and Invesco S&P 500 Equal Weight Utilities ETF (RSPU). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IDU achieves a 8.16% return, which is significantly lower than RSPU's 11.00% return. Over the past 10 years, IDU has underperformed RSPU with an annualized return of 9.02%, while RSPU has yielded a comparatively higher 9.89% annualized return.

IDU

• 1D: 0.60%
• 1M: 1.91%
• YTD: 8.16%
• 6M: 7.72%
• 1Y: 14.82%
• 3Y*: 15.17%
• 5Y*: 10.47%
• 10Y*: 9.02%

RSPU

• 1D: 0.81%
• 1M: 2.51%
• YTD: 11.00%
• 6M: 10.89%
• 1Y: 20.11%
• 3Y*: 17.17%
• 5Y*: 12.35%
• 10Y*: 9.89%

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

IDU vs. RSPU - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IDU iShares U.S. Utilities ETF	8.16%	15.23%	23.23%	-5.02%	0.17%	16.96%	-1.07%	24.21%	3.93%	11.94%
RSPU Invesco S&P 500 Equal Weight Utilities ETF	11.00%	16.82%	23.57%	-3.45%	4.37%	17.13%	-2.70%	22.94%	6.89%	9.43%

Correlation

The correlation between IDU and RSPU is 0.97 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.97
Correlation (3Y) Calculated over the trailing 3-year period	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.98
Correlation (10Y) Calculated over the trailing 10-year period	0.97
Correlation (All Time) Calculated using the full available price history since Nov 7, 2006	0.89

The correlation between IDU and RSPU has been stable across timeframes, ranging from 0.89 to 0.98 - a consistent structural relationship.

IDU vs. RSPU - Sectors Allocation Comparison

Sectors	IDU	RSPU
Utilities	91.1%	99.6%
Industrials	8.4%	-
Energy	0.5%	-
Basic Materials	-	-
Communication Services	-	-
Consumer Cyclical	-	-
Consumer Defensive	-	-
Financial Services	-	0.4%
Healthcare	-	-
Real Estate	-	-
Technology	-	-

Return for Risk

IDU vs. RSPU — Risk / Return Rank

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

IDU

IDU Risk / Return Rank: 32
IDU Sharpe Ratio Rank: 33
IDU Sortino Ratio Rank: 30
IDU Omega Ratio Rank: 30
IDU Calmar Ratio Rank: 36
IDU Martin Ratio Rank: 28

RSPU

RSPU Risk / Return Rank: 45
RSPU Sharpe Ratio Rank: 47
RSPU Sortino Ratio Rank: 43
RSPU Omega Ratio Rank: 42
RSPU Calmar Ratio Rank: 55
RSPU Martin Ratio Rank: 38

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.

IDU vs. RSPU - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares U.S. Utilities ETF (IDU) and Invesco S&P 500 Equal Weight Utilities ETF (RSPU). 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.

	IDU	RSPU	Difference
Sharpe ratio: Return per unit of total volatility	1.07	1.44	-0.36
Sortino ratio: Return per unit of downside risk	1.51	1.95	-0.44
Omega ratio: Gain probability vs. loss probability	1.19	1.25	-0.06
Calmar ratio: Return relative to maximum drawdown	1.63	2.39	-0.76
Martin ratio: Return relative to average drawdown	3.59	5.28	-1.69

IDU vs. RSPU - Sharpe Ratio Comparison

The current IDU Sharpe Ratio is 1.07, which is comparable to the RSPU Sharpe Ratio of 1.44. The chart below compares the historical Sharpe Ratios of IDU and RSPU, 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

IDU vs. RSPU - Drawdown Comparison

The maximum IDU drawdown since its inception was -53.88%, which is greater than RSPU's maximum drawdown of -48.08%. Use the drawdown chart below to compare losses from any high point for IDU and RSPU.

Drawdown Indicators

	IDU	RSPU	Difference
Max Drawdown Largest peak-to-trough decline	-53.88%	-48.08%	-5.80%
Max Drawdown (1Y) Largest decline over 1 year	-9.15%	-8.46%	-0.69%
Max Drawdown (3Y) Largest decline over 3 years	-16.74%	-16.27%	-0.47%
Max Drawdown (5Y) Largest decline over 5 years	-24.11%	-21.86%	-2.25%
Max Drawdown (10Y) Largest decline over 10 years	-36.18%	-36.85%	+0.67%
Current Drawdown Current decline from peak	-2.90%	-1.69%	-1.21%
Average Drawdown Average peak-to-trough decline	-11.37%	-7.84%	-3.53%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.14%	3.82%	+0.32%

Volatility

IDU vs. RSPU - Volatility Comparison

iShares U.S. Utilities ETF (IDU) and Invesco S&P 500 Equal Weight Utilities ETF (RSPU) have volatilities of 5.05% and 5.07%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IDU	RSPU	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.05%	5.07%	-0.02%
Volatility (6M) Calculated over the trailing 6-month period	11.13%	11.19%	-0.06%
Volatility (1Y) Calculated over the trailing 1-year period	13.95%	14.13%	-0.18%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.47%	16.90%	-0.43%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.74%	19.11%	-0.37%

IDU vs. RSPU - Expense Ratio Comparison

IDU has a 0.42% expense ratio, which is higher than RSPU's 0.40% expense ratio.

Dividends

IDU vs. RSPU - Dividend Comparison

IDU's dividend yield for the trailing twelve months is around 2.17%, less than RSPU's 2.47% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IDU iShares U.S. Utilities ETF	2.17%	2.23%	2.29%	2.79%	2.39%	2.39%	2.94%	2.71%	2.80%	2.62%	3.18%	4.22%
RSPU Invesco S&P 500 Equal Weight Utilities ETF	2.47%	2.54%	2.39%	2.92%	2.35%	2.41%	2.94%	2.54%	3.11%	3.08%	2.98%	4.14%

Frequently Asked Questions

Can I hold both IDU and RSPU in my portfolio?

With a correlation of 0.97, IDU and RSPU move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, IDU or RSPU?

RSPU has higher volatility (5.07%) compared to IDU (5.05%). In terms of maximum drawdown, IDU dropped -53.88% vs RSPU's -48.08%.

Which ETF is better, IDU or RSPU?

On 10-year performance, RSPU leads with 9.89% vs 9.02% for IDU. On fees, RSPU is cheaper at 0.40% 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, IDU or RSPU?

Over the 10-year period, RSPU has performed better with a 9.89% return vs 9.02%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, IDU or RSPU?

RSPU is cheaper with a 0.40% expense ratio, compared with 0.42% for IDU.

Which ETF pays a higher dividend yield, IDU or RSPU?

RSPU has the higher dividend yield at 2.47%, compared with 2.17% for IDU.

What is the main difference between IDU and RSPU?

IDU tracks Dow Jones U.S. Utilities Index, while RSPU tracks S&P 500 Equal Weighted / Utilities Plus. They also come from different issuers: iShares and Invesco. Their fees differ too: 0.42% for IDU and 0.40% for RSPU.

Which has better risk-adjusted returns?

RSPU currently has the higher Sharpe Ratio (1.44 vs 1.07), 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.