# 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.
- Title: AI Bubble Debate Intensifies as Oaktree Marks Signals Limited…
- Summary: 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…
- Keywords: nasdaq-100, oaktree capital, howard marks, ai bubble, shiller cape, tech stocks, s&p 500, nvidia, apple, microsoft, credit market, ai infrastructure
- Source: BigGo Finance — https://finance.biggo.com/news/c7871306-1986-4f8e-803b-259d1db168f9
- Author: BigGo Finance
- Published: 2026-10-19T02:25:18+00:00
- Read time: 1 min
- Topics: nasdaq-100, oaktree capital, howard marks, ai bubble, shiller cape, tech stocks, s&p 500, nvidia, apple, microsoft, credit market, ai infrastructure
## 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
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.
## Key takeaway

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.