The session ends with every major U.S. index in the green — and one well ahead of the pack. The Nasdaq's 1.9% gain towers over the Russell's 1.5%, the S&P's 0.9%, and the Dow's modest 0.7%, and the reason is no mystery ^{[1] — Marlee Caden "The Nasdaq jumped 1.9%, its biggest gain among major indices, powered almost entirely by a rip in semiconductor stocks. Micron, SanDisk, an…" 00:05 Play} . Semiconductor stocks exploded higher, with Micron, SanDisk, and Western Digital each climbing as much as 14.3% in a single session ^{[1] — Marlee Caden "The Nasdaq jumped 1.9%, its biggest gain among major indices, powered almost entirely by a rip in semiconductor stocks. Micron, SanDisk, an…" 00:05 Play} . Nvidia — the bellwether of the AI trade — closed 2% higher, suggesting the broader rotation back into technology was purposeful rather than speculative. With major big tech earnings looming later in the week, investors appear to be pre-positioning, betting that strong results will validate the AI infrastructure boom. The session reads less like a random rally and more like a deliberate bet.

In a disclosure that rattled markets, Nvidia revealed it now holds 22.3 million Class A shares of Nebius, a 9.3% passive stake worth more than $4 billion ^{[1] — Marlee Caden "Nvidia disclosed a 9.3% passive stake in Nebius worth more than $4 billion — 22.3 million Class A shares. The neo-cloud company's stock sur…" 00:38 Play} . The neo-cloud company's stock responded immediately, surging 18.8% on the news — a dramatic single-session move that reflects just how closely investors are watching Nvidia's every capital allocation decision. This isn't Nvidia's first move on Nebius: the chipmaker already made a $2 billion strategic investment in March, meaning its total exposure to the company now runs well north of $6 billion ^{[1] — Marlee Caden "Nvidia disclosed a 9.3% passive stake in Nebius worth more than $4 billion — 22.3 million Class A shares. The neo-cloud company's stock sur…" 00:38 Play} . The pattern suggests Nvidia is quietly building a significant position in the emerging neo-cloud space, likely to secure AI compute capacity and infrastructure partnerships outside the traditional hyperscaler ecosystem. For Nebius, the Nvidia endorsement is transformative — turning a relatively obscure infrastructure play into a name investors are scrambling to learn.

While the AI trade broadly celebrated today, Oracle found itself on the wrong side of the story ^{[1] — Marlee Caden "Reports say Oracle could be required to post roughly $7 billion in collateral tied to a large AI data center project in Wisconsin. The stoc…" 01:03 Play} . Reports indicate the enterprise software and cloud giant could be required to post roughly $7 billion in collateral as part of a large AI data center project in Wisconsin — a figure large enough to raise serious questions about financial flexibility ^{[1] — Marlee Caden "Reports say Oracle could be required to post roughly $7 billion in collateral tied to a large AI data center project in Wisconsin. The stoc…" 01:03 Play} . The stock is already trading just above its 52-week low, a precarious position that amplifies the significance of any new balance sheet burden. Investors are increasingly asking whether Oracle's aggressive push into AI infrastructure is outpacing its financial footing — and today's reports do nothing to quiet that concern. The contrast with Nvidia's bullish day is stark: one company is seen as the engine of the AI buildout, the other as potentially over-leveraged to it.

As the session winds down, the focus pivots immediately to what comes next ^{[1] — Marlee Caden "Alphabet and Tesla headline tomorrow's after-bell earnings, joined by IBM, ServiceNow, Texas Instruments, GE Vernova, and AT&T. Philip Morr…" 01:23 Play} . Alphabet and Tesla will co-headline tomorrow's after-bell earnings — two of the most closely watched names in the market — alongside a deep roster that includes IBM, ServiceNow, Texas Instruments, GE Vernova, and AT&T. Philip Morris adds a pre-market data point before the open. It's one of the busiest single earnings days of the season, and the results will test whether today's AI-driven optimism was prescient or premature. The stakes are high: a strong read from Alphabet on AI spending and ad revenue could cement the rally, while any weakness from Tesla could introduce fresh volatility into an otherwise buoyant market.