What Is XLU? Utilities Select Sector SPDR Fund

XLU is the Utilities Select Sector SPDR Fund, launched by State Street in December 1998 as one of the original nine Select Sector SPDRs that split the S&P 500 into investable sector slices. It tracks the Utilities Select Sector Index, a market-cap-weighted benchmark of the utilities companies inside the S&P 500, and charges a 0.08% expense ratio.

The fund holds roughly 34 stocks: regulated electric utilities, multi-utilities that combine gas and power, and a growing weight in merchant power generators. With about $24 billion in assets, XLU is the largest and most heavily traded utilities ETF, which is why it is the default building block for anyone wanting one-ticker exposure to the US utilities sector.

Approximate weights as of mid-2026; refresh quarterly from State Street Global Advisors (SPDR)'s fund page. Each ticker links to its individual stock guide in Walnut.

XLU is concentrated at the top. NextEra Energy alone is around 13% of the fund, followed by Southern Company, Duke Energy, Constellation Energy, and American Electric Power. The next tier includes Sempra, Dominion Energy, Entergy, Exelon, and Vistra. The ten largest positions add up to well over half of assets, so a handful of names drives most of XLU's performance.

By industry the fund is dominated by electric utilities, with a large slice of multi-utilities and smaller weights in independent power producers, gas utilities, and water. The recent story is the rise of merchant and nuclear generators like Constellation and Vistra, whose weights have grown as power demand from AI data centers has lifted their earnings outlook and share prices.

XLU and Vanguard's VPU are the two dominant utilities ETFs, and the choice comes down to breadth versus liquidity. XLU holds only the ~34 utilities in the S&P 500 at a 0.08% fee, tilting it toward mega-cap regulated names. VPU tracks a broader index of about 65 stocks at 0.09%, reaching into mid and small caps for slightly more diversification.

In practice the two track closely because both are dominated by the same large utilities. XLU wins on trading volume and options depth, which matters for active traders and hedgers. VPU appeals to buy-and-hold investors who want the widest possible utilities net. State Street also runs XLU as the reference sector fund, so it is the more commonly quoted benchmark for the sector.

For most of its history XLU behaved as a classic defensive, income sector: steady dividends, lower volatility than the broad market, and sensitivity to interest rates, since utilities carry heavy debt and their yields compete with bonds. It tends to lag in strong bull markets and hold up better in downturns.

The newer wrinkle is AI-driven electricity demand. After years of flat US power consumption, data-center growth has created a durable demand tailwind for generators inside XLU, repricing names like Constellation Energy and Vistra and adding a growth narrative to a sector long viewed as a bond substitute. That said, XLU remains rate-sensitive and concentrated, and the data-center theme is already partly reflected in prices.

XLU suits investors who want cheap, liquid, income-oriented exposure to US utilities as a defensive or diversifying tilt. Its ~2.7% yield and lower volatility can steady a portfolio, and the AI power-demand theme adds an unusual growth angle. The trade-offs are real: it is a single-sector, concentrated fund that is sensitive to interest rates and can underperform for long stretches in risk-on markets.

How much, if any, belongs in a given portfolio depends on your goals, time horizon, income needs, and what you already own. Walnut is not an investment adviser and this is not a recommendation to buy or sell XLU; it is descriptive information to help you decide how the fund fits your own targets.

XLU trades on the NYSE Arca exchange and can be bought through any US brokerage, including Robinhood, Fidelity, Schwab, and Public. Many of these support fractional shares, so you can buy a specific dollar amount rather than a whole share. Because XLU is highly liquid, spreads are tight and orders fill easily during market hours.

If you use Walnut, you can connect your brokerage to track XLU alongside the rest of your portfolio, see how it maps to your target weights, and monitor how the utilities position is doing over time. Walnut is the tracking and intelligence layer; the actual trade executes at your connected broker, and Walnut never places orders on its own.

ETFs are passive bundles; thematic baskets in Walnut let you concentrate within them. If you hold XLU as a core position, these are the themes you might layer on as satellites.

The bottom line on XLU: it is the cheapest, largest, most liquid way to own the S&P 500 utilities sector, yielding around 2.7% from a concentrated set of ~34 regulated names. It plays a satellite role, an income-and-defensive tilt inside a diversified portfolio, not a standalone core holding.

Whether XLU is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, concentration, and what would have to be true for it to outperform from here in is XLU a buy?

XLU yields ~2.7% as of mid-2026, paid by passing through the dividends of its underlying holdings. For the payout schedule, history, and how the distributions are taxed, see XLU dividend: yield and schedule.