IDU vs XLU: Holdings Overlap
iShares · 44 holdings · $1.5B · as of 2026-04-30
XLUState Street® Utilities Select Sector SPDR® ETF
State Street (SPDR) · 31 holdings · $23.0B · as of 2026-08-06
Holdings snapshots are 98 days apart (IDU: 2026-04-30, XLU: 2026-08-06). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are IDU and XLU?
iShares U.S. Utilities ETF (IDU, by iShares) holds 44 positions; State Street® Utilities Select Sector SPDR® ETF (XLU, by State Street (SPDR)) holds 31. They have 31 holdings in common, and by portfolio weight the two funds are 86.6% identical. In practical terms the pair is essentially interchangeable, so holding both adds little diversification.
- Overlap by Weight
- 86.6%Sum of the smaller weight of each shared holding
- Shared Holdings
- 31IDU holds 44 · XLU holds 31
- Weight in Shared Holdings
- IDU 87%·XLU 100%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in IDU
13 of 44 positions (13.2% of the fund) are not held by XLU.
Only in XLU
Every position in XLU is also held by IDU, so it brings nothing the other fund doesn’t already own.
Sector Breakdown
| Sector | IDU | XLU |
|---|---|---|
| Utilities | 91.2% | 99.7% |
| Industrials | 8.6% | 0.0% |
| Other Sectors | 0.0% | 0.0% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IDU | -4.3% | +3.5% | +2.8% | +14.4% | +8.5% | +8.6% | 2.27% |
| XLU | -4.6% | +3.5% | +3.6% | +14.3% | +8.5% | +9.0% | 2.74% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in IDU vs XLU →
Shared Holdings(31)
The top 10 shared positions account for 59% of the overlap, led by NEE, SO and DUK.
 NEENextEra Energy Inc COM | 12.22% | 12.99% | 12.22% |
|---|---|---|---|
 SOSouthern Co. (The) | 6.38% | 7.71% | 6.38% |
 DUKDuke Energy Corp COM NEW | 6.03% | 7.11% | 6.03% |
 CEGConstellation Energy Corp. COM | 5.84% | 6.15% | 5.84% |
 AEPAmerican Electric Power Co, Inc. COM | 4.39% | 5.02% | 4.39% |
 SRESempra COM | 3.71% | 4.06% | 3.71% |
 DDominion Energy Inc COM | 3.29% | 4.33% | 3.29% |
 VSTVistra Corp. COMMON STOCK | 3.20% | 3.30% | 3.20% |
 ETREntergy Corporation COM | 3.15% | 3.59% | 3.15% |
 XELXcel Energy Inc COM | 2.94% | 3.54% | 2.94% |
 EXCExelon Corp. COM | 2.78% | 3.42% | 2.78% |
 PEGPublic Service Enterprise Group Incorporated COM | 2.44% | 2.75% | 2.44% |
 EDConsolidated Edison, Inc. COM | 2.40% | 2.96% | 2.40% |
 WECWEC Energy Group Inc. COM | 2.30% | 2.59% | 2.30% |
 PCGPG&E Corporation COM | 2.18% | 2.76% | 2.18% |
 DTEDTE Energy Co. COM | 1.88% | 2.14% | 1.88% |
 NRGNRG Energy, Inc. COM NEW | 1.91% | 1.85% | 1.85% |
 AEEAmeren Corp. COM | 1.84% | 2.21% | 1.84% |
 ATOAtmos Energy Corp. COM | 1.82% | 2.11% | 1.82% |
 CNPCenterpoint Energy Inc COM | 1.70% | 1.96% | 1.70% |
 PPLPPL Corporation COM | 1.66% | 1.92% | 1.66% |
 ESEversource Energy COM | 1.59% | 2.00% | 1.59% |
 EIXEdison International COM | 1.59% | 1.91% | 1.59% |
 FEFirstEnergy Corp. COM | 1.56% | 1.80% | 1.56% |
 AWKAmerican Water Works Company, Inc. COM | 1.50% | 1.94% | 1.50% |
Frequently Asked Questions
How much do IDU and XLU overlap?
IDU and XLU overlap by 86.6% of portfolio weight. They share 31 holdings (IDU holds 44 positions and XLU holds 31), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IDU and XLU?
The two portfolios are 86.6% identical by weight. Owning both is largely redundant: they are close to the same portfolio, so a second position mostly duplicates the first.
What are the biggest shared holdings of IDU and XLU?
The largest positions held by both funds are NEE, SO, DUK, CEG and AEP. Together the top 10 shared positions account for 59% of the total overlap.
What does IDU own that XLU doesn't?
13 positions (13.2% of IDU) are unique to IDU, led by WM, RSG and TLN. In the other direction, 0 positions (0.0% of XLU) are unique to XLU.