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AI Rally Keeps U.S. Stocks at Records as Big Tech Debt and Power Demands Mount

October 7, 2026 at 12:37 EDT

Finance
Infra & Chips

Big Tech's AI rally has turned from a stock-market theme into a cross-asset test of how much capital, power and patience investors will supply. U.S. equities are setting records, but the same trade is concentrating index gains and pushing hyperscalers deeper into bond markets.

Oct. 7, 2026 · AI markets

The AI trade is carrying more than tech

Record U.S. indexes now sit on a narrower base of AI-linked giants, while the buildout is spilling into corporate debt and power markets.

7,818.93

S&P 500 close after a 0.6% gain

$194B

Bonds issued by four hyperscalers through July 7

$1.3T+

Projected hyperscaler capex by 2027

890 MW

New nuclear capacity for PJM

AI buildout debt has already surpassed last year

Each block represents about $10B of bond issuance.

$108B

All 2025

$194B

2026 to July 7

The AI financing wave reached about 1.8x last year's four-company total by early July.

How one trade spreads

AI demand

Cloud and model use require more compute.

Capex surge

Data centers, chips and grid upgrades scale up.

Debt and power

Bond supply and long-term energy deals expand.

Market risk

Indexes rely more on a small group of winners.

Bull case

AI demand is showing up in infrastructure contracts, power deals and expectations for future cloud revenue.

Risk case

Market breadth is narrow, profitability remains hard to separate and financing needs are rising before returns are fully proven.

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