IDUvsRSPUETF Comparison
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iShares U.S. Utilities ETF (IDU) belongs to the US Utilities segment. Invesco S&P 500® Equal Weight Utilities ETF (RSPU) is part of the US Large Cap segment. IDU's top 3 sector exposures are Utilities and Industrials. In contrast, RSPU's top sector exposures are Utilities IDU is less expensive with a Total Expense Ratio (TER) of 0.38%, versus 0.4% for RSPU. IDU is up 4.39% year-to-date (YTD) with -$340M in YTD flows. RSPU performs better with 6.7% YTD performance, and +$857K in YTD flows. Run a side-by-side ETF comparison of IDU and RSPU below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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IDU vs RSPU performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 06/17/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | IDU RSPU | +1.01%+1.91% | -5.02%-4.06% | +4.39%+6.70% | +11.32%+16.22% | +46.84%+53.83% | +55.86%+68.48% |
| Flows | IDU RSPU | -$95M-$12M | -$49M+$8M | -$340M+$857K | -$185M+$38M | +$78M+$45M | +$193M+$220M |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | IDU RSPU | +17.60%+17.28% | +14.03%+14.12% | +15.49%+15.83% | +16.61%+16.96% |
| Max drawdown | IDU RSPU | -8.43%-8.25% | -9.16%-8.46% | -16.72%-16.39% | -24.11%-21.97% |
| Max drawdown duration | IDU RSPU | 69d69d | 108d108d | 247d257d | 610d610d |
Trading data
IDU | RSPU | |
Last sale 6/17/2026 at 1:30 PM | $111.81 | $79.21 |
| Previous close 06/17/2026 | $113.22 | $80.29 |
| Consolidated volume 06/17/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of May 29, 2026
1-year trailing difference
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IDU | RSPU | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 6/17/2026 at 1:30 PM
Live
Closed
IDU | RSPU | |
|---|---|---|
| Last price | $111.81 | $79.21 |
| 1D performance | -1.25% | -1.35% |
| AuM | $1.37 B | $532.43 M |
| E/R | 0.38% | 0.4% |
Characteristics
IDU | RSPU | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | iShares | Invesco |
| Benchmark | Russell 1000 Utilities RIC 22.5/45 Capped Index | S&P 500 Equal Weight Utilities & Telecommunications Index |
| N° of holdings | 42 | 31 |
| Asset class | Equities | Equities |
| Trailing 12m distribution yield | Join | Join |
| Inception date | June 12, 2000 | November 1, 2006 |
| ESG | No | No |
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Exposure
Countries
IDU
USA
99.69%
Other
0.31%
RSPU
USA
100%
Other
-0%
Sectors
IDU
Utilities
89.63%
Industrials
8.9%
Other
1.46%
RSPU
Utilities
100%
Other
-0%
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Diversification
IDU
Total weight of top 15 holdings out of 15
66.45%
RSPU
Total weight of top 15 holdings out of 15
49.88%
Top 15 holdings
Data as of April 30, 2026
IDU
NEXTERA ENERGY
12.22%
SOUTHERN
6.38%
DUKE ENERGY
6.03%
CONSTELLATION ENERGY CORP
5.84%
WASTE MANAGEMENT
5.15%
AMERICAN ELECTRIC POWER
4.39%
SEMPRA ENERGY
3.71%
DOMINION ENERGY
3.29%
VISTRA CORP
3.20%
ENTERGY
3.15%
XCEL ENERGY
2.94%
EXELON CORP
2.78%
REPUBLIC SVCS
2.54%
PUBLIC SRVCE ENT
2.44%
CONSOLIDATED EDISON
2.40%
RSPU
ENTERGY
3.51%
NRG ENERGY
3.47%
CONSTELLATION ENERGY CORP
3.37%
VISTRA CORP
3.37%
NISOURCE
3.35%
NEXTERA ENERGY
3.33%
PPL
3.31%
AMERICAN ELECTRIC POWER
3.31%
AMEREN
3.29%
ALLIANT ENERGY
3.29%
AES
3.27%
PINNACLE WEST
3.27%
WEC ENERGY GROUP INC
3.27%
ATMOS ENERGY
3.24%
EVERGY
3.24%
Frequently asked questions about IDU and RSPU
How have the IDU and RSPU ETFs performed in 2026?
As of June 17, 2026, IDU is up 4.39% year-to-date (YTD), while RSPU has returned 6.7%. That puts RSPU better performer ahead so far this year.
Which ETF is attracting more investor money: IDU or RSPU?
Year-to-date, the IDU ETF saw -$340M in flows, compared to +$857K for RSPU.
Which ETF is more volatile: IDU or RSPU?
Over the past year, IDU had a volatility of 14.03%, while RSPU experienced 14.12%.
Which ETF is bigger: IDU or RSPU?
As of June 17, 2026, IDU holds $1.37 B in assets under management (AUM), while RSPU manages $532.43 M.
What sectors do the IDU and RSPU ETFs invest in?
IDU leans toward sectors like Utilities and Industrials. Meanwhile, RSPU focuses on Utilities.
What are the top holdings of the IDU ETF and RSPU ETF?
IDU top holdings include NEXTERA ENERGY, SOUTHERN and DUKE ENERGY. RSPU holds in its top three: ENTERGY, NRG ENERGY and CONSTELLATION ENERGY CORP.
Which ETF is more diversified: IDU or RSPU?
IDU holds 45 securities with 66.45% of its assets in the top 15. RSPU has 31 securities and a top 15 weight of 49.88%.
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