Key Highlights

● SEI was trading at $63.40 on Thursday, down 8.61%.

● Solaris provides power and mobile-generation solutions tied to data-center demand.

● AI-capex worries hit data-center-linked stocks beyond the semiconductor group.

● Oil surged to its highest level since May on Middle East tensions.

Solaris Energy Infrastructure, Inc. (NYSE:SEI), a provider of power and mobile-generation solutions with exposure to data-center power demand, declined on Thursday, October 22, 2026 as the market soured on names tied to the artificial-intelligence build-out. The stock was trading at $63.40 after a decline of 8.61%. The move was not the product of any company announcement; no company-specific news was reported as the driver. Instead, Solaris fell because AI-capex and data-center-linked plays sold off during the session, and it belongs to exactly that cohort of stocks.

AI Anxiety Spreads Beyond Chips

The day's defining storyline was a renewed wave of anxiety over how much, and how quickly, companies will spend on AI infrastructure. Worries about the durability of the AI trade resurfaced after earnings from several large technology companies, and the selling that followed was not confined to semiconductors. It reached into the broader ecosystem of businesses whose growth narratives are linked to data-center expansion, including those supplying the power and electrical capacity that large computing facilities require. Solaris, with its exposure to data-center power, sits in that orbit, and when sentiment toward the AI build-out turns cautious, names like it are repriced alongside the chipmakers at the heart of the theme.

The broader tape reflected where the pressure was landing. The Nasdaq Composite, heavily weighted toward technology, fell 2.60% to 26,008.86, the weakest of the major indexes. The S&P 500 declined 1.21% to 7,663.45, while the Dow Jones Industrial Average essentially held flat at 52,867.98. The gap between a steady Dow and a sliding Nasdaq made clear that the weakness was concentrated in technology and the AI-linked complex rather than spread across the whole market. A data-center-power name was on the vulnerable side of that divide.

A Thematic Selloff, Not a Company Event

There was no earnings report from Solaris behind the move, no guidance update, no transaction, and no analyst action reported for the session. This was a thematic selloff. When the market reassesses the pace of AI spending and pulls back from data-center-linked plays as a group, companies positioned to benefit from that build-out tend to fall together, regardless of whether any of them has released news. Solaris moved as a part of that group, pressured by sentiment toward the AI-capex theme rather than by anything specific to its own operations.

The macro backdrop around the session was mixed and did little to help. Oil surged to its highest level since May on Middle East tensions, which is a complex crosscurrent for an energy-infrastructure name but did not override the dominant AI-capex pressure on the day. Treasury yields fell, with the 10-year note dropping about 11 basis points toward the 5% level, a move that tends to support rate-sensitive groups such as homebuilders. Precious metals sold off sharply, with gold down roughly 2.5%, and initial jobless claims fell to their lowest in roughly three months. None of these threads reversed the direction for a stock caught in the data-center-plays selloff.

A Power Story Tied to AI Sentiment

For Solaris Energy Infrastructure, Thursday was a day driven by the market's reconsideration of the AI build-out rather than by any company event. The stock declined because data-center and AI-capex names were out of favor, not because of a catalyst of its own. For a business whose investment story is tied to powering the next wave of computing demand, sessions like this one show how closely its shares can track broader sentiment toward the AI theme, moving down with the group when enthusiasm cools.