Super Micro's 28% Crash After $7B Stock Sale Rocks AI Startup Valuations

For the venture ecosystem, Wednesday’s 28% plunge in AI server maker Super Micro is a stark reminder that the public markets won’t indefinitely fund the AI gold rush. With Nvidia shedding 3.7% and Broadcom down 5.1%, late-stage startup valuations—often pegged to these giants—face a harsh reality check. This correction may force early-stage investors to demand leaner business models and clearer paths to revenue.

Wall Street’s AI-driven rally suffered a significant blow on Wednesday, triggering a global ripple effect as Asian shares slipped and oil prices gyrated. The S&P 500 tumbled 1.6% to close at 7,266.99, its first back-to-back drop in three weeks, while the Dow Jones Industrial Average plunged 953 points (1.9%) and the Nasdaq composite led the decline with a 2% slide. The sell-off was centered on the very artificial-intelligence stocks that had carried the market to records just days earlier, raising urgent questions about whether the AI mania has overshot fundamentals. Compounding the instability, overnight oil prices rose sharply after the U.S. launched a second round of airstrikes against Iran, though they later retreated, leaving U.S. benchmark crude at $89.21 a barrel.

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Broadcom fell 5.1%, and Micron Technology swung wildly within the session, ultimately losing 4.7% after a week in which it plunged 7.7%, then 13.3%, then rallied 9.9%.

The most striking casualty was Super Micro Computer, a server maker heavily leveraged to AI demand, which cratered 28% after announcing a $7 billion equity and convertible preferred stock offering. Such moves are typically executed when share prices are elevated, and the ensuing dilution was a clear signal that even companies at the heart of the AI boom are eager to cash in. Meanwhile, Oracle’s disclosure that it plans to raise $40 billion in cash this fiscal year through borrowing and stock sales—after raising $48 billion last year for AI investments—sent its shares down 11.1%. These capital-raising binge exposes the financial strain of sustaining AI infrastructure buildout, and investors are growing wary that the returns may not justify the sums deployed.

The semiconductor sector, which had been the star of the market, faced across-the-board pressure. Nvidia, the nearly $4.9 trillion titan of AI chips, shed 3.7%, acting as the heaviest weight on the S&P 500. Broadcom fell 5.1%, and Micron Technology swung wildly within the session, ultimately losing 4.7% after a week in which it plunged 7.7%, then 13.3%, then rallied 9.9%. The volatility is amplifying concerns that the sector’s valuations have become detached from reality: the question now is whether this week’s pullback is a healthy clearing of excessive optimism or the beginning of a longer downturn.

In Asia, the fallout was mixed but largely negative. Tokyo’s Nikkei 225 lost 0.5% to 63,878.60, while the Kospi in South Korea was down 0.2%. Hong Kong’s Hang Seng managed a 0.2% gain, but the Shanghai Composite fell 0.2%. European markets, opening later, showed more resilience: Germany’s DAX was nearly unchanged and the FTSE 100 added 0.5%. U.S. futures pointed to a partial rebound on Thursday, with S&P 500 futures up 0.8% and Dow futures gaining 0.7%, though Nasdaq futures skidded 1% as AI stocks continued to swing.