# Jeremy Grantham says this is 'the most expensive market in 'American history'

> **Newsylist Open Intelligence Dossier** · First detected: 2026-06-26 15:23 UTC · Category: Business · Sources: 8 · Current Velocity: 5.66

## Executive Summary
Investor Jeremy Grantham warns that U.S. stocks are in the most expensive market in American history and could crash by 70%.

## Intelligence Brief
Investor Jeremy Grantham has issued a warning that U.S. equities are currently in the most expensive market in American history. He suggests that the market could plunge or crash by 70%.


Coverage from CNBC, qz.com, and Seeking Alpha emphasizes that the AI boom has pushed stocks to record highs. TradingView and 24/7 Wall St. highlight the scale of the potential decline.


Observers are monitoring whether investors follow Grantham's suggestion to flee U.S. equities before an epic crash occurs.

## Verified Facts & Key Claims
### What is the predicted scale of the stock market crash?
Jeremy Grantham warns that U.S. stocks could plunge or crash by 70%.

### What factor is driving the record high stock prices?
According to coverage from qz.com, the AI boom has pushed U.S. stocks to record highs.

### What action is Grantham recommending?
Seeking Alpha reports that Grantham says to flee U.S. equities.

## Key People, Organizations & Locations
American, History, Jeremy Grantham, Jeremy Grantham Warns U.S Stocks Could Plunge, Most Expensive Market, Legendary Investor Jeremy Grantham Warns U.S Stocks Could Crash, Sounding the AI, Grantham

## Multi-Source Evidence Table
| Source Outlet | Headline | Published (UTC) | Verification URL |
|---|---|---|---|
| thestreet.com | Wall Street veteran warns of epic stock market crash | 2026-06-26 14:14 | [Source Link](https://news.google.com/rss/articles/CBMimwFBVV95cUxQTjJ3TDZmVE44aTc1LXloWEpDRVpib0RwQV9yQUtKR2JTblE1UFVFSDU2Q2lLV0RYVkpBb01xRGtNdjIzY2Q1dWZ5RUd5eVFWaUdNV0U4V3VTaUdHSXJKaUlGYUVPUFlER2dWZUdxRVdYMVlfVmhpUWk1Szl3VUZZYzFsUmQ3YnFKaXBRYzkxNFdrSFlPLXVVLTREWQ?oc=5) |
| A Wealth of Common Sense | Spotting Bubbles and Calling Tops | 2026-06-26 14:14 | [Source Link](https://news.google.com/rss/articles/CBMigAFBVV95cUxNekNWUmdlMW9RdGJlSTBETTljTE1TcGxObzBCdGhyejVEMlYzTUFzVVpESmlfSFMwaUwtR0REcFR0N3d2WE16bll3dFF0dkRkRW15Rm8tTW9rUlZwWnAzYUhIcVQ2LUVuSlJsOWFxUGNqZ3lpRGdiSlhqaWJ3a1BYaw?oc=5) |
| Yahoo Finance | Jeremy Grantham: How to invest like a stock market legend | 2026-06-26 14:14 | [Source Link](https://news.google.com/rss/articles/CBMiogFBVV95cUxPeHBMVk5SVDAxRlRKMVpxUE1tYzFfcUFac19Vd0JXLXM2REhJa3dDVkIwbnRJSk9RYjRnV0NtNm42RVoxWlBVbUZyVE14YlBiY013bTNwRmxwVjBJOG1BekZPbERaZEoyaEtFNXJVdTFaNTZEQVZpRC1nR1E0SVZlZmRPQ0VGckdCX0RPTnpoRUdiSE91bGRGeGFSWGhyb1pVMmc?oc=5) |
| 24/7 Wall St. | Jeremy Grantham Warns U.S. Stocks Could Plunge 70% in the Most Expensive Market in History | 2026-06-26 14:14 | [Source Link](https://news.google.com/rss/articles/CBMizAFBVV95cUxNa0lqMC1NZW5UV1pXZnpVcmlaTHhZaUFfNmp2RnFRV2hfTHRadmo4Z19XZ1lES05UVHdCeUoyRTJweU1IOTExeDY0U29NdnhVcEl2TW1uaUF1akI3SUxiakFtZTVLWjBfMWplVzJEN2VVbk44VE1odkFNV2c1VUlVa3E1aDU1S0w3dGNzWTYwYWIyZzJ0Q2ExSlhSa29YT19HM3FHRmR1TW0zOFJwR0diTmpDUVphQWU1WkRiUUcwYkdJd0VWOWNNeFZwV1g?oc=5) |
| TradingView | Legendary Investor Jeremy Grantham Warns U.S. Stocks Could Crash 70% | 2026-06-26 14:14 | [Source Link](https://news.google.com/rss/articles/CBMixAFBVV95cUxPcWJyT1lUQXVpQVhFamo2aWlHQXFiVndWVEUzWUpYNTB0T3hva1R0NXV6TnhIMURWalpRaVRYdkd5M1FEdmp4OVlxWHNHZHYtaFBEa3NNX0pYV2ZYdlhvQVl1d0taQ1U5WnR4YmEzX1FjeE1BeE1hMDdwUHpVR2Q4ZEhheS1fLVM1S2V3N0xsYzdxLThHb3lpalVQcHR6eUI4RDRoNjVnbjctOGg2bkVPTnRoQVV0YVVYNFFCVmJPS3YyZGpY?oc=5) |
| qz.com | Jeremy Grantham warns AI boom pushed U.S. stocks to record high | 2026-06-26 14:14 | [Source Link](https://news.google.com/rss/articles/CBMid0FVX3lxTE9PRzdMcFcwdThWVTFMNFllYkVMekdoTllJazlrTEJIdmVKYkVVU3BlbzJETi1pcFlRLU4xWVhhWW5vR2JHVnZwdXdrQXNKS2J4TVNzbzEzd2ZpaV9BRVY3cHhQbnNTbjFaUFUtZzlnYThuOVZSRnBN?oc=5) |
| Seeking Alpha | Sounding the AI alarm, Grantham says to flee U.S. equities before epic crash (SPY:NYSEARCA) | 2026-06-26 14:14 | [Source Link](https://news.google.com/rss/articles/CBMisAFBVV95cUxNdldoMkp4ekN6T1V2WHhtX2pjdUQzc3JHTjZ0NWtPQXd6b0tGcFFhMC05cUZmTDBfcHpXZlpXVDJEOEU5SWFCSG44OEdGRnBEeXR2Q0NVNGFZNEtrVkNWeFozcWMydU1KejlkMVVYUVhiQ0o2MkVGR0VzYWpOX19iWXJkdHNiOTFLSzNUOHJTYXVoZ3VBZGtqam1nMjJtd2E3cUNYVnVzeWJVX2dIbXBVQw?oc=5) |
| CNBC | Jeremy Grantham says this is 'the most expensive market in 'American history' | 2026-06-26 14:14 | [Source Link](https://news.google.com/rss/articles/CBMisAFBVV95cUxOajR3eDA3OVB0aHV4aWx4ak1lM2RlTUNJek16dmx4RWo5NFIzY1JsdWRvM1FDckxxYU1FNmVlWWl6MWM4WVUwYjg3dDZpX2I2emtVaHJNTm44RE8xaGZPcmZSODRpY0dHdWV4czlDbjhXNDNYUzFBQzFsMDBpSWdkR0ZCaXdwd1gtZlFOOG9XSmxESzlfMmtGc3BjVHNocUV4WGI4UjR4NmE5OUxZZldHM9IBtgFBVV95cUxQbV9MYlRYcFRzS0hlQS1nOGZmMEo3RDlfWG1JeTJtaTU2VExHdXR4VGlQQlNkU0VnNFVBVUtvQ0lPY1JVOEJoLVRoZDkxbUctUXJCalI3eVB4NldvSzJ0TEtOdEM5Qkl0bkVoQy1CSmdmblkwNWdITGVpUHlnVW1pMmhWWndHQXM2UjhHYldZWU5iSkF5bTlCU2tkVHBtcjRRQy1) |

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*Canonical Source: https://www.newsylist.com/trend/2026-06-26/jeremy-grantham-says-this-is-the-most-expensive-market-in-american-history*
*Synthesized by Newsylist Open Intelligence Engine under E-E-A-T journalistic standards.*