Jeremy Grantham
Co-founder of GMO — one of the most prominent students of financial bubbles, known for mean-reversion thinking and a long-horizon, valuation-driven view of markets.
Who he is
Jeremy Grantham co-founded GMO in 1977 and became one of the most-quoted voices on market bubbles and long-term asset-class returns. His quarterly letters chronicle, with unusual data depth, how speculative manias form, peak, and unwind.
He correctly warned about the dot-com and housing bubbles, which cemented his reputation as a sober, contrarian historian of excess.
Core philosophy
Grantham's central idea is mean reversion: profit margins, valuations, and asset prices tend to revert to long-term norms. Extreme highs are followed by disappointing returns, and extreme lows by strong ones. The job of a long-term investor is to lean against extremes.
He thinks in asset classes and decades rather than individual stocks and quarters, allocating toward the cheapest assets relative to history and away from the most expensive — even when that means being early and uncomfortable.
Key lessons for individual investors
- What goes to an extreme usually reverts — high valuations imply low future returns, and vice versa.
- Bubbles are recognizable by their data signatures, even if their timing is not.
- Think in decades and asset classes, not quarters and tickers.
- Being early looks like being wrong; long-horizon discipline is the price of contrarianism.
- The best long-term returns often come from buying what others have given up on.
Live track record & latest portfolio
Real figures from public 13F filings and historical returns, via GMO LLC. For education only — not investment advice, and not a recommendation to copy any position.
Annual return history
Yearly returns (%) as reported by GuruFocus. Past performance does not predict future results.
Source: GuruFocus. Figures are delayed and may be revised.
Ask Jeremy Grantham a question
Type a question about Jeremy Grantham's classic investment theories, or pick one below.
When the price already assumed a miracle
In 1972, institutions convinced themselves that about fifty "one-decision" growth stocks could be bought at any price and never sold. Polaroid traded above 90 times earnings, McDonald's and Disney near 80, Avon around 65. Run the arithmetic backwards and those prices quietly assumed decades of flawless, ever-accelerating growth.
The 1973–74 bear market repriced the dream: the group fell 60–90%, and Polaroid eventually went bankrupt. The cruel detail is that many of the businesses kept growing exactly as promised — the investments still failed, because the starting price had already spent the future.
Run the DCF backwards: ask what growth today's price assumes, then ask honestly whether reality can deliver it.
The company delivered. The price still failed.
In March 2000 Cisco briefly became the most valuable company on earth at roughly $550 billion — over 100 times earnings. Run the DCF backwards and the price required Cisco to grow flawlessly for decades and become a meaningful share of the entire economy. Analysts at the time called it conservative.
Here is the cruel part: the business largely delivered. Revenue and profits are several times larger today than in 2000. The stock still fell almost 90%, and did not reclaim its 2000 high for about 21 years — because the question was never whether Cisco would grow, but whether it could grow faster than a price that had already spent the future. It could not.
Reverse the DCF before you buy: ask what growth today's price already assumes. A great company and a great investment are only the same thing at the right price.
The courage to do nothing
At the top of the speculative "Go-Go" years, Buffett — after thirteen years compounding near 30% with no down year — wrote to his partners that he no longer understood the market and could find nothing sensible to buy. Rather than lower his standards, he closed the partnership and handed back the money at the peak of his fame.
Then he waited. When the 1973–74 crash finally arrived, he was liquid while everyone else was forced to sell, and described feeling "like an oversexed man in a harem" — buying the Washington Post and other franchises at panic prices that set up the next thirty years.
Cash and patience are positions too. Standards only count if you keep them when it is hardest.
Related tools
Frequently asked questions
What is mean reversion?
The tendency of valuations, margins, and prices to return to long-term averages. Grantham uses it to argue that extreme highs imply weak future returns and extreme lows imply strong ones.
Is Grantham a stock-picker?
Less so — he is best known for top-down asset-class allocation and valuation analysis across markets, rather than individual stock selection.
Measure how stretched today's valuations really are:
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