AI Bubble Debate Intensifies as Oaktree Marks Signals Limited Risk

Wall Street's AI bubble fears grow as Oaktree's Howard Marks argues widespread questioning makes a full bubble less likely.

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Oct 19, 2026

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AI Bubble Debate Intensifies as Oaktree Marks Signals Limited Risk

Wall Street's AI bubble fears grow as Oaktree's Howard Marks argues widespread questioning makes a full bubble less likely.

In brief

Wall Street's AI bubble fears grow as Oaktree's Howard Marks argues widespread questioning makes a full bubble less likely. Howard Marks says asking about an AI bubble reduces its likelihood, as Nasdaq-100 drops 5.5% and tech stocks trade at lower P/E ratios. Originally reported by BigGo Finance.

AI Bubble Fears Rise

AI Bubble Fears Rise

The Nasdaq-100 Index fell 5.5% last week, intensifying fears of an AI bubble.

Howard Marks' Counterintuitive View

Oaktree Capital Co-Chairman Howard Marks argues that the most telling feature of a bubble is investors' total obliviousness to risk.

Market Signals Mixed

Wall Street today everyone is asking whether a bubble exists, a mixed signal that suggests any bubble would be limited in scope.

Tech Stock Valuations Cooling

AI Bubble Alarms Keep Ringing, but Oaktree's Marks Says Everyone Asking About a Bubble Makes One Less Likely to Form

The five largest tech stocks trade at an average forward P/E of about 23 times, far below 65 times in 2000.

Shiller CAPE Ratio Alarms

The Shiller CAPE ratio of roughly 41 times is closing in on the 1999 record of 44 times.

Market Concentration Concerns

Nvidia, Apple and Microsoft together account for about 21% of the S&P 500.

Credit Market as Key Trigger

Market participants warn that tech giants are taking on debt to build AI infrastructure, weighing on valuations.

Cloud Spending Surge

The four major cloud providers are projected to spend $700 billion to $725 billion in 2026, up 75% from $410 billion in 2025.

Credit Market Stress Spreads

Japan's Nikkei 225 plunged 3,318.34 points (4.90%) on October 15, closing at 64,425.95.

Marks' Final Assessment

Marks says the term 'bubble' is inherently vague, but the key signal, obliviousness, is not present right now.

“irrational exuberance heedless risk-taking and obliviousness”

What Happens Next

When everyone on Wall Street debates whether a bubble exists, that widespread vigilance may itself cushion the market.

In short

Howard Marks says asking about an AI bubble reduces its likelihood, as Nasdaq-100 drops 5.5% and tech stocks trade at lower P/E ratios.

Read the original on BigGo Finance

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