US AI Chip Stocks Slump: Wall Street Faces Major Selloff in Semiconductor Sector

A massive selloff swept through Wall Street on Tuesday, targeting the semiconductor industry and the primary beneficiaries of the artificial intelligence boom. As investors reassess the sustainability of high valuations, major chipmakers and tech giants are seeing significant market value erosion.

Memory Chip Makers Lead the Market Decline

The semiconductor sector faced a brutal session, with memory chip manufacturers bearing the brunt of the investor exodus. SanDisk led the downward spiral, plunging 12%, followed closely by Micron Technology, which dropped 9% in premarket trading. AMD also faced significant pressure, falling 5%, while Intel and Western Digital saw declines of nearly 7% and 8%, respectively.

This volatility comes after memory chip companies emerged as top performers in early 2026, driven by the massive demand for AI servers and data centers. However, the sudden decline suggests that the market is entering a phase of heightened caution as the industry prepares for upcoming earnings announcements.

Nasdaq 100 and Tech Giants Under Pressure

The weakness in chips has triggered a broader correction across the technology sector. Nasdaq 100 futures fell approximately 2.5%, a move that puts the index on track to wipe out more than $1 trillion in market value. The contagion spread rapidly through the "Magnificent Seven" tech giants, with six out of the seven companies trading lower.

The selloff also extended to high-profile AI-linked listings like SpaceX. Following a three-day rout, SpaceX shares fell an additional 3.6%, erasing more than $600 billion from its market value. The company's valuation briefly dipped below the $2 trillion mark, shortly after its highly anticipated Nasdaq debut.

The ROI Question: Can AI Spending Justify Valuations?

The primary driver behind this market correction is growing skepticism regarding the Return on Investment (ROI) of massive AI capital expenditures. Technology behemoths, including Microsoft, Amazon, Alphabet, and Meta, have committed hundreds of billions of dollars toward building AI infrastructure, data centers, and computing capacity.

While the fundamental demand for AI remains robust, market participants are now demanding clearer evidence that these astronomical investments will translate into sustainable revenue and rapid profitability. Investors appear to be locking in gains, wary of whether the current valuations can be supported by real-world earnings growth. This sentiment is not unique to the US, as South Korean memory chip makers also recorded steep losses, signaling a global reassessment of the AI-driven rally.

Key Takeaways

  • Heavy Losses in Semiconductors: Leading chipmakers like SanDisk (-12%), Micron (-9%), and AMD (-5%) experienced a sharp decline, signaling a retreat from AI-related hardware stocks.
  • Massive Market Value Erosion: The Nasdaq 100's decline is projected to wipe out over $1 trillion in value, impacting the broader "Magnificent Seven" and high-valuation firms like SpaceX.
  • Shift Toward Profitability Scrutiny: The selloff is driven by investor concerns over whether the hundreds of billions spent by Big Tech on AI infrastructure will yield timely and sustainable returns.