Technology (XLK) vs Utilities (XLU)
XLK (Technology Select SPDR) closed at $155.03 on April 21, 2026, near its 52-week high of $156.07. XLU (Utilities Select SPDR) was at $46.21 on April 24, also near recent highs.
Also known as: Technology (XLK) (ETF_XLK, tech sector) · Utilities (XLU) (ETF_XLU, utilities)
Why This Comparison Matters
XLK (Technology Select SPDR) closed at $155.03 on April 21, 2026, near its 52-week high of $156.07. XLU (Utilities Select SPDR) was at $46.21 on April 24, also near recent highs. The XLK/XLU ratio of 3.35 is in the upper half of the post-2010 range, but utilities have substantially closed the gap since 2023. The driver is unprecedented: AI data center power demand has lifted XLU as a growth proxy alongside its traditional defensive yield role. NVIDIA at 15.14 percent of XLK and NextEra Energy at 14.01 percent of XLU now both benefit from the same AI capex cycle, breaking the historical growth-versus-defense polarity that defined the ratio.
What XLK and XLU Hold
XLK holds 76 stocks representing the technology sector of the S&P 500. April 2026 top holdings: NVIDIA 15.14 percent, Apple 12.53 percent, Microsoft 9.64 percent, Broadcom 6.22 percent, Micron Technology 4.12 percent. The fund is highly concentrated in mega-cap names: top 5 represent 47 percent of assets. AUM approximately $70 billion, expense ratio 0.08 percent. XLK is the primary US-listed pure technology sector exposure.
XLU holds approximately 30 stocks in the utilities sector. Top holdings: NextEra Energy 14.01 percent, Southern Company 7.23 percent, Duke Energy roughly 7 percent, Constellation Energy roughly 6 percent. AUM approximately $20 billion, expense ratio 0.08 percent. XLU has historically been the cleanest defensive sector exposure with high dividend yields (3 to 4 percent) and rate-sensitive bond-like behavior. The sector's composition has shifted in 2024 to 2026 toward utilities with substantial nuclear, renewable, and data center exposure, changing the fundamental character of the fund.
The Growth-Defense Polarity (Until 2024)
For three decades the XLK/XLU ratio captured the cleanest growth-defense rotation signal. Tech is long-duration: most of its earnings come from future growth that gets discounted heavily when rates rise. Utilities are short-duration with stable, regulated cash flows that are valued like bonds. When risk appetite is strong and growth expectations rising, XLK leads XLU. When risk appetite weakens and recession risk rises, XLU leads XLK as investors rotate to defensive yield.
The ratio captured the dot-com peak and crash (XLK/XLU peaked above 10 in 2000, fell to 3 by 2002), the 2008 to 2009 financial crisis (XLK/XLU fell from 4.5 to 2.5), and the 2022 inflation reset (XLK/XLU fell from 5.5 in late 2021 to 3.8 in October 2022). In each cycle, utility outperformance preceded or coincided with broader equity stress, and tech outperformance signaled risk-on regimes. The relationship was mechanically rate-driven: utilities benefited from falling rates, tech suffered; rising rates flipped the dynamic.
AI Has Broken the Old Defensive Story
Starting in 2024, AI data center demand fundamentally altered XLU's character. Hyperscalers (Microsoft, Google, Meta, Amazon, Oracle) committed approximately $500 billion in annual AI infrastructure spending. Data centers consume vast electricity: a single hyperscale data center uses 100 to 300 megawatts continuously, equivalent to 100,000 to 300,000 homes.
Conditional Forward Response (Tail Events)
How Utilities (XLU) has historically behaved in the 5 sessions following a top-decile or bottom-decile daily move in Technology (XLK). Computed from 1,287 aligned daily observations ending .
Following these triggers, Utilities (XLU) rises 0.29% on average over the next 5 sessions, versus an unconditional baseline of +0.12%. 128 qualifying events; Utilities (XLU) closed positive in 55% of them.
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Frequently Asked Questions
What is the current XLK/XLU ratio?+
The ratio is approximately 3.35 in April 2026 ($155 XLK / $46 XLU). The ratio is below the 2024 average of 3.8 to 3.9 but above 2009 to 2017 averages of 2.5 to 3.0. The decline from 2024 highs reflects XLU catching up rather than XLK weakness: XLK is near all-time highs, but XLU has gained approximately 25 percent over the trailing 12 months thanks to AI data center power demand. Historical context: XLK/XLU peaked above 10 in 2000 (dot-com bubble), bottomed at 2.0 in 2002 (post-crash) and 2008 to 2009 (financial crisis), and reached approximately 6 in late 2021.
Why have utilities outperformed?+
AI data center power demand has fundamentally changed the utilities sector. Hyperscalers (Microsoft, Google, Meta, Amazon, Oracle) committed approximately $500 billion in annual AI infrastructure spending. A single hyperscale data center uses 100 to 300 megawatts, equivalent to 100,000 to 300,000 homes. US data center electricity consumption is projected to reach 9 percent of total US electricity demand by 2030 (from 4 percent in 2024). Utilities have signed multi-billion dollar power purchase agreements with hyperscalers, and stocks like NextEra (14.01 percent of XLU), Constellation Energy, and Vistra have been among the strongest sector performers, lifting XLU on a growth-thesis basis rather than its traditional defensive-yield basis.
How does AI capex affect both XLK and XLU?+
Both legs benefit from the same cycle. NVIDIA at 15.14 percent of XLK earned $194 billion in fiscal 2026 data center revenue from selling GPUs to hyperscalers. NextEra at 14.01 percent of XLU has signed power purchase agreements totaling roughly 30 GW with the same hyperscalers. The structural correlation between XLK and XLU has therefore risen substantially: AI capex acceleration lifts both, AI capex disappointments hurt both. The cap-weighted XLK/XLU ratio is less sensitive to AI capex shifts than its construction would suggest. For cleaner rotation signals, equal-weighted indices or AI-excluded versions provide better signal-to-noise.
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