---
title: "AI-led rally faces risks from record margin debt, narrow gains"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/286962326.md"
description: "The AI-led rally is at risk due to record margin debt of $1.304 trillion, a 53% increase in a year, which heightens both gains and losses. Ten major tech firms dominate 40% of the S&P 500's value, while other stocks lag. Potential downturns could arise from overvaluation, concentrated leadership, and geopolitical shocks, leading to possible liquidations."
datetime: "2026-05-19T20:25:18.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/286962326.md)
  - [en](https://longbridge.com/en/news/286962326.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/286962326.md)
---

# AI-led rally faces risks from record margin debt, narrow gains

AI giants dominate: Ten mega-cap tech firms, many tied to AI, now make up roughly 40% of the S&P 500's value, with most other stocks lagging. Leverage at extremes: Margin debt has hit a record $1.304 trillion, up 53% in a year, amplifying both potential gains and potential losses. Downturn triggers: Overvaluation, concentrated leadership, and geopolitical shocks could quickly unravel the rally, forcing widespread liquidations.

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