George Soros
Referenced for reflexivity theory and macro speculation
Biography
George Soros (born 1930) is a Hungarian-American investor, hedge fund manager, and philanthropist who built one of the most extraordinary macro investment track records in financial history. Born György Schwartz in Budapest, he survived the Nazi occupation of Hungary and emigrated to England in 1947, studying under philosopher Karl Popper at the London School of Economics. He moved to New York in 1956 and founded the Quantum Fund in 1973 with Jim Rogers.
The Quantum Fund generated approximately 30% annual returns over 30 years — a record unmatched by any investor managing comparable scale. Its most famous single trade was the 1992 "breaking of the Bank of England": Soros sold $10 billion of British pounds short ahead of the United Kingdom's forced withdrawal from the European Exchange Rate Mechanism, generating a profit of roughly $1 billion in a single day.
Soros divides his time between investment management and philanthropy through the Open Society Foundations, which he founded to promote democracy and civil society globally, investing approximately $1 billion annually.
Soros appears in 9 Oaktree memos with 33 total mentions. He is referenced by Marks primarily for his theory of reflexivity — one of the most sophisticated analytical frameworks for understanding why markets overshoot.
Marks' engagement with Soros is intellectual rather than personal. There is no record of a working relationship between the two men, and Marks does not claim one. What Marks takes from Soros is a single idea, tested against each new boom: reflexivity. He returns to it in memos written more than two decades apart — from "Touchstones" in 2009 to "On Bubble Watch" in 2025 — treating it as a permanent feature of markets rather than a historical curiosity. He also uses Soros' career as a calibration device: when the greatest macro trader alive is carried out by a market, or calls a crisis the worst since World War II, that is data.
Key Stories
The Reflexivity Theory — Soros developed his theory of reflexivity from Karl Popper's philosophy and his own trading experience. The core insight: market participants' beliefs about the world affect the world itself, which in turn affects their beliefs, creating feedback loops that make markets self-referential rather than self-correcting. In a simple example: investors believe a currency is strong; they buy it; buying makes it stronger; stronger currency confirms the belief; more investors buy. The feedback loop amplifies until it reaches a point where it cannot sustain itself, then reverses — often violently. This is not irrational behavior; it is the logical consequence of acting on correct beliefs in a world where beliefs themselves affect outcomes.
Breaking the Bank of England — The 1992 pound sterling trade is the most famous single investment decision of the 20th century. Soros diagnosed a fundamental misalignment: the UK had joined the Exchange Rate Mechanism at too high a rate, and the Bundesbank's refusal to cut rates made the commitment unsustainable. He sold pounds short massively, forcing the UK government to spend its reserves defending the peg, eventually exhausting them. The UK withdrew, the pound fell, and Soros made $1 billion. This trade is cited by Marks not as a model to imitate — Marks explicitly does not make macro bets — but as the ultimate demonstration of what genuine macro insight looks like when combined with the conviction and scale to act on it.
The Philanthropist-Investor — Soros has committed roughly half his investment gains to philanthropy, primarily through the Open Society Foundations. Marks references this occasionally as context for the broader picture of Soros' career and values — not to validate his philanthropy but to acknowledge that great investment success can coexist with deep public engagement.
The Reflexivity Proof — Soros has argued that academic economics is fatally flawed by its assumption of rational actors and efficient markets. His own career — consistently identifying and exploiting situations where market prices were self-reinforcing in ways that departed from fundamental value — is the empirical proof of his theoretical critique. Marks finds this argument as compelling as financial mathematics finds it unsatisfying.
The Ninth Inning — In "Irrational Exuberance" (May 2000), Marks records the moment the great macro funds broke against the tech bubble. Julian Robertson had closed Tiger after refusing to play a market he considered irrational; Soros' Quantum went the other way. Stanley Druckenmiller, Quantum's portfolio manager since 1989, had resisted tech stocks until mid-1999, then bought in and made a bundle in the second half — then held on into 2000 and took heavy losses. The New York Times quoted his rueful summary: "We thought it was the eighth inning, but it was the ninth." Soros' own admission was starker: "Maybe I don't understand the market. Maybe the music has stopped but people are still dancing." Marks draws one lesson from the pair, and it is not about skill: irrational markets can kill you on either side. Robertson said "this is irrational and I won't play" and was carried out; Druckenmiller said "this is irrational and I will play" and was carried out too.
The 1994 Yen Loss — In "Risk in Todays Markets Revisited" (1994), Marks uses Quantum as a magnifying glass for investor behavior. When the fund lost $600 million on a yen position in a single day, the point for Marks was not that Soros had stumbled — it was that even the most sophisticated macro operators were running concentrated, trend-following risk that their own investors often did not understand. The hedge fund losses of early 1994 reinforced one of Marks' durable rules: only by really knowing what a manager does can you be sure he is right for you. Soros, in this memo, is not a hero or a cautionary tale; he is the largest available specimen of a general phenomenon.
Impact on Marks' Work
Reflexivity as Cycle Amplification: The reflexivity framework explains why the credit cycle consistently overshoots — not because participants are irrational, but because their behavior is causally connected to the outcomes they are predicting. When lenders lend more because prices are rising, prices rise further because lending is increasing. The feedback loop creates the overshoot. Marks uses this framework to explain why credit booms consistently become more extreme than fundamental analysis would suggest they should.
Self-Reinforcing Sentiment: Soros' observation that market trends tend to amplify themselves through reflexive feedback is directly integrated into Marks' pendulum framework. The pendulum doesn't just swing; it swings because each move creates the conditions for further movement in the same direction — until the loop breaks.
The Macro Contrast: Marks explicitly does not practice macro investing. He references Soros to acknowledge what genuine macro skill looks like while clarifying that Oaktree's approach is fundamentally different. The contrast clarifies Oaktree's investment philosophy by showing what it is not.
Reflexivity Across Twenty-Five Years: The strongest evidence of Soros' influence on Marks is durability. In "On Bubble Watch" (2025) — written on the twenty-fifth anniversary of the memo that made his bubble call famous — Marks examines the AI-driven market and reaches for the same framework: heated buying, spurred by the observation that stocks had never performed poorly for a long period, carried prices to a point from which they were destined to do just that. "In my view," he writes, "that's George Soros's investment 'reflexivity' at work." The idea has not aged; Marks applies it to each new boom in turn, as readily to 2025 as to 1999.
Calibrating the Crisis: In "The Aviary" (2008), with the Bear Stearns rescue only weeks old, Marks weighs the optimists calling the bottom against the pessimists — and Soros supplies the heaviest weight on the pessimist side, describing the episode as "much more serious than any other financial crisis since the end of World War II." Marks does not declare a winner; he lays out the tug-of-war. Soros appears in the memo as part of that method: a data point of unusual credibility about how bad things might be.
Key Passages From Marks' Memos
"George Soros has written and spoken most articulately about the ability of investors' actions to change the environment. He calls this process 'reflexivity.'"
— Touchstones (2009)
"That misses the reality behind George Soros's Theory of Reflexivity: that the actions of market participants change the market."
— Investing Without People (2018)
"One of the most important things to always bear in mind is George Soros's 'theory of reflexivity,' which I paraphrase as saying that the efforts of investors to master the market affect the market they're trying to master."
— Yet Again (2017)
"Last week saw a pullback from risk on the part of George Soros, head of the remarkable Quantum Fund (up 32%/year after fees for 30 years), and the resignation of Stanley Druckenmiller, its portfolio manager since 1989."
— Irrational Exuberance (2000)
"In my view, that's George Soros's investment 'reflexivity' at work."
— On Bubble Watch (2025)
"And George Soros described this go-round as 'much more serious than any other financial crisis since the end of World War II.'"
— The Aviary (2008)
Referenced In
Source: Howard Marks Knowledge Base — Oaktree Capital Management memos 1990–2025