The Diary Of A CEO

Stock Market EMERGENCY: Sell Your Stocks Now, The Collapse Is Weeks Away!

with Jeremy Grantham
25 Jun 2026 5 min read 1h 41m

Jeremy Grantham argues the current AI-driven stock market is the biggest bubble in American history and is weeks away from bursting — dwarfing the dot-com and housing crashes he previously called. He recommends abandoning US equities in favour of international and emerging market stocks, resources, and cash, while warning that a parallel fertility crisis driven by microplastics and pesticides poses an existential civilisational risk that is being almost entirely ignored.

Jeremy Grantham
“The AI bubble is the broadest and most extreme in American history. We had the South Sea Bubble, we had the dot-com, we had the housing bubble — this one has characteristics of all three at the same time.”
Grantham making his central case for why the current moment is uniquely dangerous for investors, shortly after the episode opens on the AI bubble question.
▶ 8:54
Jeremy Grantham
“AI will change the world — I have no doubt about that. But changing the world does not mean the companies involved make money. The railroads changed the world and most of them went bankrupt. The internet changed the world and most of the dot-coms went to zero.”
Grantham distinguishing between technological impact and investment returns during the AI discussion.
▶ 11:15
Jeremy Grantham
“Wall Street has never, ever warned you when to get out of the market. Not once in history. Their business model depends on you staying invested — the day you sell is the day they stop making money from you.”
Grantham explaining why retail investors cannot rely on brokers or advisors to protect them ahead of a crash, around the investing strategy discussion.
▶ 19:52
Jeremy Grantham
“House prices need to fall thirty percent to get back to any kind of affordability that a normal working person can access. Until that happens, you have a society that is fracturing — because the young simply cannot get in.”
Grantham discussing the housing market and its social consequences during the property investment segment.
▶ 1:04:37
Jeremy Grantham
“Sperm counts have fallen fifty percent in fifty years. If you extrapolate that line, you get to zero. That is not a metaphor — that is the data. And almost nobody in power is talking about it.”
Grantham shifting to the fertility crisis segment, warning about declining male reproductive health driven by chemical exposure.
▶ 1:10:50
Jeremy Grantham is the co-founder of GMO, an institutional investment firm based in Boston, where he serves as the firm's long-term investment strategist. He is widely known for correctly predicting both the dot-com crash and the 2007 housing collapse. Grantham is also the chairman of the Grantham Foundation For the Preservation of the Environment and co-author of 'The Making of a Permabear: The Perils of Long-term Investing in a Short-term World'.
1
US stocks are uniquely dangerous right now Grantham argues US equities are more overvalued than at any prior bubble peak on multiple measures. His recommended alternative is a portfolio weighted toward international developed markets, emerging markets, and resource stocks — areas he sees as genuinely cheap relative to fundamentals.
2
Sperm counts are on a trajectory toward zero Measured sperm counts have dropped roughly 50% over the past 50 years. Grantham links this to ubiquitous exposure to endocrine-disrupting chemicals — pesticides, microplastics, and synthetic compounds in cosmetics and food packaging — and warns the trend shows no sign of reversing without regulatory intervention.
3
Reduce chemical exposure with practical household swaps Grantham recommends avoiding plastics in food contact (especially when heated), choosing organic produce for the highest-pesticide crops, and switching to cosmetics and personal care products that avoid parabens and phthalates. These steps won't eliminate exposure but meaningfully reduce the body burden of the worst compounds.