Mar 23, 2026 · 1h 22m · capital-allocators
Jeremy Grantham – Bubbles, Value Investing, and the Long Game at GMO (EP.493)
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In this episode of Capital Allocators, GMO co-founder Jeremy Grantham joins Ted Seides to examine six decades of market cycles, outlining his statistical framework for identifying speculative super-bubbles from the dot-com era to modern artificial intelligence. Grantham shares insights on institutional career risk, the quantitative evolution of GMO, and his mission-driven capital allocation toward climate solutions and sustainable capitalism.
How this conversation actually went
Every chapter scored 0–10 on four independent dynamics. Hover any point for the reasoning behind the score. Ted holds 15% of the talking time here. How this is scored →
Ted as informed peer 3.8 Guest teaching 4.7 Guest disagreement 3.2 Ted pushing back 0.3
speaking balance: gold is Ted, purple is the guest (3 minute bins)
Sharpest disagreement ▶ 1:18:20 Teflon men attack on Greenspan and Summers
Grantham forcefully attacks Alan Greenspan and Larry Summers for bullying Brooksley Born at the CFTC and deregulating subprime mortgages, arguing they almost destroyed the entire global financial system without facing accountability.
Hardest push from Ted ▶ 29:15 Host challenges game-theoretic incentive to stay fully investedTed presses Grantham on the implications of his institutional game theory, noting that if managers never get fired in bull markets but get fired for underperforming rallies, the logical conclusion is to remain aggressively long regardless of valuation.
Biggest teaching moment ▶ 31:50 Revealing institutional hypocrisy with 400 analysts surveyGrantham educates the listener by recounting an empirical poll of 400 Wall Street equity analysts who voted 99% in agreement that extreme valuations would crash, illustrating how institutional propaganda diverges from private analytical consensus.
Ted holds their own ▶ 46:13 Ted queries market status after incomplete 2-sigma mean reversionTed demonstrates sharp analytical grasp of Grantham's technical framework by immediately identifying that the 2022 decline stopped halfway to trend, prompting Grantham to address the unprecedented dynamics of an overlapping AI bubble.
the scores for every segment, with the reasoning behind each
| Chapter | Topic | Ted as informed peer | Guest teaching | Guest disagreement | Ted pushing back | Why |
|---|---|---|---|---|---|---|
| Preview: Historical Bubbles, Speculative Excess, and the AI Boom | 0 | 0 | 4 | 0 | Introductory preview and monologue where Grantham describes the historical inevitability of tech bubble overshoots using Amazon and railroads, followed by Ted introducing the episode. | |
| Sponsor Message: AlphaSense AI Platform for Verifiable Financial Research | 0 | 0 | 0 | 0 | Sponsor ad reads for AlphaSense and Intap DealCloud delivered as host monologue. | |
| Sponsor Message: Admired Leadership and the Alex AI Coaching Tool | 3 | 2 | 1 | 0 | After an ad for Admired Leadership, Ted opens the interview asking about Grantham's formative years in wartime Yorkshire and Quaker roots shaping his lifelong frugality. | |
| Early Fascination with Numbers, Probability Systems, and First Stock Investments | 3 | 4 | 2 | 0 | Grantham details his early obsession with probability, roulette tables, and his first stock purchase in Acro Engineering, while critiquing business school overconfidence. | |
| Early Career Moves: From Management Consulting to Institutional Investing | 3 | 3 | 3 | 0 | Grantham amusingly dismisses management consulting as a superficial waste of space compared to deep research and explains why fun in investing drew him to Keystone Funds. | |
| Co-Founding Batterymarch and Establishing GMO's Value Edge | 4 | 5 | 3 | 0 | Grantham explains founding Batterymarch and GMO, beating the Nifty Fifty by exploiting an informational edge in neglected small-cap value companies like Great Lakes Dredge. | |
| Scaling GMO: The Three-Division Structure and Quantitative Innovation | 4 | 4 | 1 | 0 | Grantham explains the division of GMO into three units and building early quantitative expert systems to replicate value stock picking. | |
| The Dot-Com Crucible: Value Underperformance, Client Backlash, and Outflows | 4 | 6 | 4 | 0 | Grantham recounts the brutal client backlash during the late 90s dot-com bubble, noting that clients fire managers out of peer jealousy during bull markets rather than during bear crashes. | |
| Post-Crash Vindication, Public Debates, and Lessons on Bull Market Game Theory | 5 | 5 | 3 | 1 | Grantham describes debating prominent bulls like Jeremy Siegel and Abby Cohen, concluding that big institutions structurally cannot afford to fight bull markets due to business risk. | |
| Statistical Bubble Framework, the 2008 Housing Crisis, and Career Risk | 6 | 7 | 5 | 2 | Ted frames the game-theoretic dilemma of being long all the time. Grantham details his 2-sigma bubble framework and his poll showing 99% of 400 equity analysts privately expected a crash while their institutions stayed bullish. | |
| Navigating Bubble Realities: Timing Challenges and Quality Equity Allocation | 5 | 5 | 3 | 1 | Ted probes on the timing impossibility of bubbles. Grantham advises allocating to foreign/emerging value and emphasizes holding quality blue chips that survive depressions. | |
| Sponsor Message: Ridgeline Front-to-Back AI-Native Investment Technology | 4 | 6 | 4 | 0 | Following a Ridgeline sponsor read, Grantham outlines his indicator of late-stage bubbles (speculative leaders breaking down before blue chips) and how the AI boom interrupted the 2022 bear market. | |
| The AI Phenomenon: Transformative Technology, Massive CapEx, and Inevitable Overshoot | 5 | 6 | 4 | 1 | Ted asks where the incomplete mean-reversion leaves markets today. Grantham argues that transformative technologies like AI and railroads inevitably produce massive CapEx overshoots followed by painful busts. | |
| Institutional Groupthink, Policy Failures, and the Individual Investor Advantage | 4 | 7 | 6 | 0 | Grantham lambasts institutional groupthink, citing Fed Chair Bernanke denying the 3-sigma housing bubble in 2006 despite obvious empirical data. | |
| The Evolution, Mechanics, and Structural Limits of Index Investing | 4 | 5 | 2 | 0 | Grantham reflects on co-inventing index concepts in the 1970s, framing active trading as a poker game burdened by fees and friction, and speculates on future market pricing mechanisms. | |
| Institutional Committee Dynamics, Board Room Egos, and Governance Challenges | 4 | 5 | 3 | 0 | Grantham describes the dysfunctional dynamics of endowment boards and investment committees where wealthy donors' large egos override rational long-term strategy. | |
| Reflections on David Swensen and the Institutional Success of the Yale Model | 5 | 5 | 2 | 0 | Ted asks about David Swensen; Grantham highlights Swensen's structural advantages at Yale, early mover privilege, and ability to secure capacity with premier VC and PE managers. | |
| Human Behavioral Biases, Extrapolation Fallacies, and Demographic Crisis | 4 | 7 | 5 | 0 | Grantham discusses human evolutionary optimism, market extrapolation fallacies, and details how AI ignores non-consensus risks like chemical toxicity and fertility collapse across East Asia. | |
| The Grantham Foundation: Mission-Driven Green Venture Capital Strategy | 5 | 5 | 2 | 1 | Ted queries the allocation approach of the Grantham Foundation. Grantham explains backing high-risk green venture technologies alongside top-tier traditional VC funds. | |
| Strategic Investment Notice: Oldwell Labs Allocator Software Platform | 4 | 6 | 7 | 0 | After a brief Oldwell Labs promo, Ted asks closing questions. Grantham delivers a passionate critique of Greenspan and Larry Summers as 'Teflon men' who suppressed CFTC derivatives regulation before the 2008 crash. |
Statements from this episode (44)
Grantham: Management consulting work is typically very superficial
“The difference between what we thought we knew, which were many layers of the business, and what they knew, which was, to us, extremely superficial, let me know by the first week that consulting was like that, that it was a quick once-over, and typically very …”
Grantham: Batterymarch beat the market by six points annually over eight years
“Of the eight years of battery march, we drew one and won six and lost one, but we won by an average of six points a year over the eight years.”
Grantham: GMO beat the market for nine consecutive years by eight points annually
“We won the first nine years in a row. You can imagine starting a firm, that's a good time to do it. And we won by an average of eight points a year.”
Grantham: GMO's Early Quant Model Matched Discretionary Picks and Performed Equally Well
“So we redefined the formula until slowly but surely over a few months, we got it to kick out a portfolio, which was 90% the same as ours. Interestingly, the 10% that was different did just as well as our 10%.”
Grantham: Asset managers get fired in bull markets, not bear markets
“People think you get fired for underperforming in bear markets, which is nonsense. In a serious bear market, the client becomes catatonic.”
Grantham: No fired clients returned to GMO after dot-com crash
“No one came back after firing us, even though we were right for the right reasons, and we made a ton of money.”
Grantham: GMO made positive returns each year from 2000 to 2002
“We actually made nice money in 2000, nice money in 2001, and hung in by half a percent in 2002.”
Grantham: Big asset managers cannot commercially survive fighting major bull markets
“If you're a big company, you can't fight a major bull market. It's ridiculous. It's terrible business. You have to roll with the punch.”
Grantham: Goldman and JPMorgan will never tell clients to exit overpriced markets
“You will never hit a Goldman Sachs or a JP Morgan Tell you to get out of the market because it's ludicrously overpriced. Everybody knows today it's ludicrously overpriced, but no one can tell you, and they never will.”
Grantham: Every Two-Sigma Asset Bubble Historically Reverted to Pre-Bubble Trends
“In major countries, there was no exception to the principle that an overpriced market at two sigma, which is just a statistical measure. If you look at the price, you look at the breakout on the upside. If it's two sigma, there is no exception to the rule that…”
Grantham: GMO's AUM fell to $22B before surging to $165B post-crash
“We went from thirty two billion to 22. Then we exploded. In four years, we went from 22 to 165.”
Grantham: Navigating major bubbles is all that matters in long-term investing
“The only things that matter in life in investing are the founding, forming, and breaking of the great bubbles. That determines everything. If you can sidestep half of the pain, that will make all the difference in the world.”
Grantham: Spotting bubbles is easy, but timing them is impossible
“Seeing the bubble is easy. Getting the timing right is apparently impossible.”
Grantham: Investors should own non-US and emerging value stocks
“For a long time now, you should be owning non-US stocks, developed value stocks, and emerging country value stocks.”
Grantham: The US stock market is completely overpriced
“The US is simply too high priced from top to toe.”
Grantham: Investors forced into US equities must choose quality stocks
“If you had to own US, and a lot of people do, then you have to own quality stocks, because they have survivability.”
Grantham: In the Great Depression, value stocks went bust while quality survived
“What people found in 1929 Is the value stocks had a dangerous tendency to go bust in the Great Depression, and the Coca-Colas that were horrendously expensive did not go bust.”
Grantham: Super-Bubbles End When Speculative Market Leaders Dramatically Underperform
“I developed a singular rule that only has occurred four times in U.S. History. The stocks that have been leading the charge up 70% in 1928, the meme stocks in twenty-twenty, up huge amounts. When they start to underperform dramatically, the market, as the bull…”
Grantham: Pre-revenue QuantumScape was briefly worth more than General Motors in 2020
“It exploded to a 131 by the end of twenty-twenty. For a second was worth more than General Motors. Years away from having any sales.”
Grantham Held a Five Percent Personal Equity Stake in QuantumScape in 2020
“That was by far the biggest investment I had ever made. It's the only one I owned myself, because our opportunity to invest in it was only if we bought a whole lot. It was unsuitably large holding. I had five percent of QuantumScape, I think, in 2020.”
Grantham: AI rally aborted the full crushing of the 2022 super-bubble
“The invasion of chat and AI ruined my perfectly good bear market. I still got a bear market. It was way over 20% decline, but it wasn't the crushing of a super bubble that would have happened. Without the great investment associated, the capex associated with …”
Grantham: AI CapEx is larger than any peacetime program in history
“AI Moving at warp speed, involving a greater CapEx program than has ever happened before outside of war.”
Grantham: Great market bubbles require genuinely transformative ideas
“If you look back in history, what you find is that the great bubbles are associated with great investment ideas that get overdone. It has to be serious. And ideally, it has to be obviously serious.”
Grantham: The AI bubble will break, led down by Nvidia
“This is exactly where you'd expect the bubble to break, and you would expect, other things being even, that it will be let down by NVIDIA, followed closely by the other giants.”
Grantham: US housing never bubbled nationwide until Greenspan and Bernanke
“The American housing market had famously bubbled in Chicago and bust in California, bubbled in Florida, etc. Never altogether until Greenspan and Bernanke.”
Grantham: Complex organizations almost always miss major turning points
“Complex organizations always get it wrong at major turning points, or almost always.”
Grantham: Passive investors must outperform active managers net of fees
“By definition, they sum to the market minus the cost of transactions and minus the fees that they charge. And the guys at the bar watching you, they sum to zero. There are no costs. So they will beat you. As a group, they must outperform you.”
Grantham: Index investing now represents over half the market
“Then it started to get traction, and in the last 25 years took off, and is now more than half the market.”
Grantham: Future markets might tax stocks to fund human price discovery
“In the end, you have to have some price work. You have to find a way of paying a few thousand good analysts to help price the equities, and I don't know how they will work it out. It's over my pay grade, but one day in the distant future, there might be a very…”
Grantham: Endowment boards struggle to manage giant egos of wealthy PE and VC donors
“Many committees are a nearly impossible task where, particularly in the endowment business, colleges, because rich graduates who've made big donations, Would love to sit on the board. They are treated with kid gloves because they're wonderfully good at making …”
Grantham: College endowments face far less career risk than pension funds
“You can be an early mover at a leading college endowment more easily than most people can. A pension fund officer of a medium-large firm has got so much career risk he doesn't know whether he's coming or going.”
Grantham: Private equity and venture capital winners tend to stay winners
“Brilliant private equity and venture capital, and they are so much stickier than general money management. They don't turn over as fast in private equity and venture capital. The winners tend to stay winners.”
Grantham: Japan's 20-year-old cohort is half its 1948 size
“Do you know the twenty-year-old cohort in Japan is 50% of what it was in 1948?”
Grantham: South Korea Will Cease Being a Viable State Within 50 Years
“That South Korea cannot be a viable political entity in as little as 4050 years. Cannot.”
Grantham Foundation may reach $1B in cumulative grants by end of 2026
“I'm pleased to say that we might reach a billion dollars of grant checks written by the end of this year, cumulatively.”
Grantham: Foundation has backed 120 green startups, vast majority will fail
“So we do that, and we've done a 120 ourselves, and a lot of them will fail. The great majority will fail.”
Grantham: Foundation beat Harvard, Yale, Princeton over 10 years in Cambridge data
“Three years ago, before the current unpleasantness and the venture capital green business, we were number zero on the Cambridge Associates database, which is their code for number one. On a ten-year basis, we were beating Harvard and Yale and Princeton with ou…”
Grantham: Green Venture Capital Faces Two to Three More Bad Years
“And a lot more will fail, probably, given the level of help from the administration. I would think we're good for at least another two or three bad years.”
Grantham: Well-selected venture capital delivers the best long-term return
“The best return in the long run is probably well-selected venture capital. It should be, in theory. It appears to be in real life.”
Grantham: Climate Denial Is Predominantly an American Phenomenon
“You don't find climate deniers around the world. You find a few in England, all extreme right-wing libertarians, and you find a small army in the US, but that's it. This is an American thing, climate denial.”
Grantham: Alan Greenspan and Larry Summers Are Unaccountable 'Teflon Men'
“My biggest investment peeve is that the Greenspans and the Larry Summers, they get away with murder. I call them the Teflon men. I was heartbroken when they kept getting reappointed by new presidents that I had higher hopes for, even as they had just presided …”
Grantham: Greenspan, Summers, and Levitt Blocked CFTC Subprime Regulation
“Greenspan and Summers and Levitt of the SEC waged war against the CFTC doing its job of regulating subprime instruments. They each, in turn, called up Brooksley Bourne, who was the boss, a lady of iron nerve and principle. They harangued her, saying, what are …”