AI boom propels S&P 500 industrials to tech stock valuations
The S&P 500 industrial sector is experiencing an unprecedented surge, with valuations now mirroring those typically reserved for high-flying technology companies. This unexpected boom is largely attributable to the massive investment in artificial intelligence (AI) infrastructure, transforming a traditional segment of the economy into a powerhouse of growth.
As of July 26, 2026, the industrials sector is trading at a forward price-to-earnings (P/E) ratio exceeding 30, significantly above its long-term average of around 20. This shift marks a pivotal moment, as investors increasingly recognize industrials as crucial enablers of the ongoing AI revolution, rather than just an old-guard sector.
Industrial Sector Valuation Soars Amid AI Infrastructure Drive
The race to construct advanced AI data centers has created immense demand for the foundational components that industrial firms supply. Cinthia Murphy, director of research at VettaFi, highlighted this phenomenon on a recent “ETF Edge” segment, noting that the valuations of the Industrial Select Sector SPDR (XLI) are notably high compared to the broader S&P 500.
“It’s as high as tech,” Murphy explained, emphasizing the significant attention the sector has garnered. This isn’t just a momentary blip; it reflects a deeper structural change driven by the sheer scale of the AI buildout.
Shifting investor focus from pure tech
While tech giants like Alphabet continue to pour billions into AI development, it’s the underlying physical infrastructure that’s now commanding investor interest. Alphabet, for instance, recently forecast capital expenditures for 2026 to be between $195 billion and $205 billion, an increase from prior guidance of $180 billion to $190 billion.
The company even warned that these spending figures could climb higher in 2027. This massive outlay funnels directly into industries that provide the necessary machinery, electrical equipment, and construction services, translating into substantial revenue streams for industrial players.
The crucial role of data center spending
Experts anticipate this investment wave will continue well into the next decade. McKinsey & Company estimates global spending on data centers could approach $8 trillion by 2030, with the vast majority allocated to infrastructure and IT equipment. Jensen Huang, CEO of Nvidia, described this as “the largest infrastructure buildout in human history.”
He noted that the world is only “a few hundred billion dollars into it,” with trillions more still to be constructed. This robust demand forms the bedrock of the industrial sector’s elevated valuations, positioning these firms as indispensable partners in the digital transformation.
Key Players and Performance Highlights in the AI Buildout
Several industrial heavyweights have seen their stock prices climb dramatically on the back of this AI-driven demand. Companies supplying everything from power generation to construction equipment are benefiting, reflecting their critical role in enabling the technological revolution.
This includes firms like Caterpillar, GE Vernova, Vertiv Holdings Co., Eaton Corp., and Cummins Inc., all of whom are seeing increased demand for their core products and services.
Heavy equipment and power solutions leaders
Caterpillar, the top holding in the Industrial Select Sector SPDR (XLI), and GE Vernova, the third-largest, have both seen their stock values jump over 50% this year. Caterpillar’s performance is particularly striking, climbing nearly 160% over the past two years, underscoring the consistent demand for industrial machinery.
GE Vernova continues to secure significant bookings tied to the AI buildout, amassing a $176 billion business backlog by the end of Q2, despite headwinds in its renewable energy division. It’s not just the industry titans, though; smaller firms are also flourishing.
Emerson Electric, the 29th-largest holding in XLI, is trading almost 20% higher than in July 2024, and Hubbell, the 60th-largest, has risen 30% over the same two-year period.
Beyond AI – defense and aerospace contributions
The industrial sector’s strength isn’t solely tied to AI infrastructure. Increased defense spending globally has also provided a significant boost. Lockheed Martin, a top 20 stock in the industrials index, recently reported quarterly earnings that surpassed analyst expectations for both earnings and revenue, leading to a rally of over 10%.
Its peer, RTX Corp., the fourth-largest holding in XLI, has also seen its stock rise roughly 35% over the past year. Aerospace and defense companies constitute 25% of XLI’s sector allocation, benefiting from ongoing geopolitical developments and a broader emphasis on national security.
The traditional aviation sector also contributes, with giants like Boeing and Delta Air Lines maintaining strong performance. Delta CEO Ed Bastian noted persistent high demand for air travel, helping Delta’s shares climb 45% over the past year even amidst rising oil prices.
Growing Demand Spurs Rural Power Grid Expansion
The sheer power demands of new data centers are catalyzing significant investment in power grid infrastructure, particularly in rural areas. Many future data center projects are slated for these regions, pushing the need for substantial upgrades to existing, often limited, power capacities.
Facilities that could consume up to twenty times the current peak production capacity of rural grids are now being developed. This situation intensifies corporate demand for new electrical substations, robust high-speed fiber internet capabilities, and advanced energy-saving battery technology.
Challenges of increased power consumption
Expanding these rural power grids and building new facilities comes with its own set of challenges. Public sentiment, for example, has shown increasing animosity towards new data center construction. Concerns often revolve around potential strain on local power grids and the prospect of rising electrical costs for residents.
Addressing these concerns while facilitating the necessary infrastructure buildout will be a balancing act for regulators and developers. The need for mass amounts of power generation and backup equipment is becoming increasingly evident, requiring innovative solutions from industrial firms.
ETF Inflows Signal Broader Investor Confidence
Investor enthusiasm for industrial stocks is clearly reflected in the significant inflows into Exchange Traded Funds (ETFs) focused on the sector. Over 60 industrial ETFs exist, and they have collectively drawn approximately $23 billion in net inflows year-to-date in 2026.
This capital influx demonstrates strong confidence in the sector’s secular growth trends, driven by both AI infrastructure and the robust aerospace and defense markets. Cinthia Murphy of VettaFi confirmed this momentum, highlighting the sector’s strong performance relative to the wider market.
Popular industrial ETFs and their performance
Several ETFs stand out for their asset gathering this year. The iShares Defense Industrials Active ETF (IDEF) leads with $4.4 billion in net flow, followed by the State Street Industrial Select Sector SPDR (XLI) with $3.6 billion, and the GlobalX Defense Tech ETF (SHLD) at $2.6 billion.
Other notable performers include the First Trust RBA American Industrial Renaissance ETF (AIRR) and the Tema Space Innovators ETF (NASA), which recorded $2.5 billion and $2 billion in net inflows, respectively. These figures underscore the diverse investor interest within the broader industrial landscape.
Active vs. passive investment strategies
J.P. Morgan’s chief ETF strategist, Jon Maier, noted that a significant portion of these investments into index funds like XLI are passive, indicating long-term investor conviction. He also pointed out considerable interest in actively managed funds, with 34% of all flows directed towards them. This blend of active and passive investment suggests a broad-based belief in the industrial sector’s enduring potential.
Maier reiterated the market’s forward-looking nature, seeing stock prices as a reflection of future earnings. The robustness of these flows, reaching $17 billion into industrials, signals that investors are betting on sustained growth from this sector.
Beyond the core sector, several individual industrial stocks saw notable surges in May 2026. Middleby Corp, an Illinois-based commercial foodservice equipment manufacturer, surged 13.94%. Republic Airways Holdings Inc, an Indianapolis-based regional airline operator, jumped 22.48%, while Magnera Corp gained 14.97%.
Collegium Pharmaceutical Inc rose 14.60%, IQVIA Holdings Inc increased 13.23%, and Alexandria Real Estate Equities Inc was up 10.12%. Even 3M climbed 7.3% after exceeding analysts’ expectations for profit and revenue, and raising its full-year profit forecast, highlighting a broader strength across the industrial landscape. Chinese chip stocks have seen their own rallies tied to technological advancements.
The Interconnected Future of AI and Industrials
The current environment highlights an increasing intertwining of technology and traditional industries. The global stock markets are constantly reacting to shifts in major sectors, and industrials are proving to be a key beneficiary of the AI revolution.
The 45-day correlation between the S&P 500 Industrials Sector and the Philadelphia Stock Exchange Semiconductor Index (SOX) stands at 0.75, nearing its highest level since June. This close correlation demonstrates how closely linked the performance of industrial stocks is becoming to the semiconductor industry, a core component of AI.
Long-term outlook and market implications
The financial impact of AI is broadening beyond its traditional tech confines, deeply integrating into the wider economy. As of July 16, 2026, 218 S&P 500 companies, representing over two in five constituents, are directly exposed to the AI economy.
These companies collectively command $42.4 trillion in market value, accounting for 62.04% of the entire index. Furthermore, S&P 500 companies actively using productivity AI reported an average year-over-year revenue increase of 13.1%, more than double the S&P 500’s overall average increase of 5.1% from July 2024 to July 2025.
Resilience and security in a digital world
“Security and resilience is really important, and that’s going to play even bigger and bigger of a role,” stated Jon Maier. This perspective underscores a critical element of the industrial sector’s newfound importance. As digital infrastructure expands, so does the need for robust, secure, and reliable physical systems.
The industrial sector, with its focus on heavy machinery, power systems, and defense technologies, is uniquely positioned to meet these demands. This integration means that the growth of AI is not just a boon for software developers and chip manufacturers, but for the fundamental industrial backbone that supports our increasingly digital world.