Jeremy Grantham: Billionaire's WARNING: I'm SELLING. The Crash Is Already Here!

Jeremy Grantham opens with unusually stark personal advice: avoid U.S. stocks, sell concentrated U.S. technology holdings, and stay away from cryptocurrency. He calls Bitcoin speculative and argues it lacks the stability and everyday usefulness expected of a currency or store of value. These are his views, not individualized financial guidance, and the interview does not establish that every investor should follow the same allocation.

Grantham’s longer argument is about how markets price important ideas. He says bubbles often form around technologies that really do change the world, such as railroads and the internet. The transformative promise attracts capital, investors overbuild, and share prices can collapse even while the underlying technology later proves consequential. In his view, the size of the idea can intensify the bubble rather than protect investors from it.

Grantham calls AI the largest investment bubble in U.S. history and says a peak could arrive soon, though he allows a range from days to years. He points to SpaceX’s claimed addressable market and asteroid-mining ambitions as examples of the extraordinary expectations surrounding the current cycle. His forecast is forceful, but the discussion offers no way to date the peak precisely; its central claim is that high valuations and exuberance create risk, not that a crash must occur on a particular schedule.

His career provides context for the forecast. Grantham says he entered investing in 1968, worked through the rise of growth and value investing, and helped introduce small-cap strategies at an early firm. He describes a long-term approach that looks for broad patterns rather than near-term price movements. The interview also notes that his firm once managed $165 billion, that he personally made more than $1 billion, and that he gave most of his wealth to an environmental foundation investing in green technology.

To explain what a crash could mean, Grantham cites the 1989 Japanese market peak, the technology crash, the 1929 crash, and the “Nifty Fifty” decline. He says highly valued or fast-rising stocks could fall sharply and describes a 70 percent drop as historically plausible from current levels. He also outlines possible effects beyond investors’ accounts: layoffs, a feeling of reduced wealth, lower consumer spending, and economic stress. These are scenario estimates and historical analogies, not a guarantee of what will happen next.

For an ordinary investor, his first principle is diversification. He describes holding sound bonds and cash, with perhaps a small allocation to precious metals. The conversation then explains a bond as a loan that pays a fixed interest rate, with examples ranging from short-term Treasury bills to longer government bonds. The episode gives a basic description of how bonds work, but it does not compare their risks or explain how a listener should choose among them.