Bill Ackman is the founder and CEO of Pershing Square Capital Management, a billionaire activist investor known for his high-conviction bets and relentless pursuit of corporate change. His career spans legendary wins like General Growth Properties and the 2020 COVID hedge, alongside public battles that have reshaped his approach to "super durable" businesses.

Part 1: The Core Philosophy — High-Conviction Value

  1. On Simple Businesses: "The first rule of our investment criteria is that the business must be simple and predictable; if we cannot see the future cash flows, we cannot value it." — [Source: Pershing Square Annual Letter]
  2. On Forever Assets: "The best businesses in the world are 'forever assets' that generate predictable free cash flow and have a low probability of being disrupted by technology." — [Source: Lex Fridman Podcast]
  3. On Diversification: "Diversification is a hedge against ignorance; if you know what you are doing, you should own a small number of things you understand deeply." — [Source: Forbes Iconoclast Summit]
  4. On Value vs. Price: "Price is what you pay, but value is what you get; the goal is to find a wide gap between the two created by temporary mismanagement." — [Source: Big Think]
  5. On the 8 Criteria: "We have eight core principles engraved on stone tablets; whenever we have veered from them, particularly on business quality, we have lost money." — [Source: Daily Investor]
  6. On Capital Allocation: "A business is only as good as its ability to generate a high return on the capital it employs without needing constant external funding." — [Source: Nasdaq]
  7. On Economic Moats: "We look for businesses with dominant market positions protected by brands, unique assets, or long-term contracts that competitors cannot replicate." — [Source: Value Investing with Legends]
  8. On Inflation Resilience: "In an inflationary world, you want to own businesses that can raise prices without losing customers—growth royalties on the global economy." — [Source: Pershing Square Semi-Annual Report]
  9. On Intrinsic Worth: "The stock market is there to serve you, not to instruct you; your job is to determine the intrinsic worth of the business regardless of the ticker." — [Source: Lex Fridman Podcast]
  10. On Long-Term Horizons: "We don't invest for the quarter; we invest for the decade, treating every stock purchase as if we were buying the entire company." — [Source: Fincash]

Part 2: The Art of Due Diligence — Research & Analysis

  1. On Primary Sources: "The most important research starts with the 10-K; you must read the footnotes and the proxy statements to understand how the people are actually paid." — [Source: Lex Fridman Podcast]
  2. On Tracking Management: "Review conference call transcripts from three to five years ago to see if management actually did what they promised they would do." — [Source: Observer]
  3. On Understanding Incentives: "Show me the incentive and I will show you the outcome; if management is incentivized on top-line growth, they will often destroy value to get it." — [Source: The Knowledge Project]
  4. On Competitive Dynamics: "You cannot understand a business in a vacuum; you must understand the competitors and why customers choose one over the other." — [Source: Lex Fridman Podcast]
  5. On Forensic Accounting: "Always look for the 'gimmicks' in adjusted earnings; if a company is constantly excluding 'one-time' costs that happen every year, be wary." — [Source: Big Think]
  6. On Expert Networks: "Talk to the former employees and the disgruntled customers; they will tell you the truths that the IR department is paid to hide." — [Source: Robin Speziale]
  7. On Predictability: "If a business has cash flows that look like an EKG monitor, it isn't an investment; it's a gamble on timing." — [Source: Pershing Square Annual Letter]
  8. On Board Governance: "Check the proxy statement for 'interlocking boards'; a board that is too friendly with the CEO will never hold them accountable." — [Source: Lex Fridman Podcast]
  9. On Information Asymmetry: "Our goal is to know more about the company than any other shareholder, including many people inside the building." — [Source: Forbes]

Part 3: Activist Strategy — Fighting for Change

  1. On Recoverable Mistakes: "The best activist targets are great businesses that have made a specific, fixable mistake or have lost their way under poor leadership." — [Source: Observer]
  2. On Influential Shareholders: "We have evolved from being 'activists' to being 'influential shareholders'; we want to be the board's first call when they have a problem." — [Source: FII9 Interview]
  3. On Buying from Disappointment: "We buy our stakes from disappointed shareholders who are selling at a low price because they’ve lost hope; we provide the hope." — [Source: Big Think]
  4. On Corporate Surgery: "Sometimes a company needs a new CEO and a new headquarters to break the culture of failure, as we did with Chipotle." — [Source: Shortform]
  5. On Public Advocacy: "If the board won't listen in private, you must take the case to the public; sunlight is the best disinfectant for corporate lethargy." — [Source: Lex Fridman Podcast]
  6. On Persistence: "If I believe I am right, I will go to the ends of the earth until I am proven right; it’s not about ego, it’s about the math." — [Source: Varchev]
  7. On Capital Structure: "Often the biggest win isn't a new product, but a more efficient capital structure that returns excess cash to the owners." — [Source: Pershing Square Letter]
  8. On Board Representation: "You don't need to run the company, but you do need to have a seat at the table to ensure the owners' interests are protected." — [Source: Forbes]
  9. On Competitive Battles: "In a proxy fight, your strongest weapon is a superior plan for the business that the other shareholders can actually believe in." — [Source: The Knowledge Project]
  10. On The Activist Discount: "The market often discounts a company because of bad management; our job is to close that discount by changing the management." — [Source: Nasdaq]

Part 4: Risk Management — The Macro View & Hedging

  1. On The Big Short: "Risk management isn't just about diversification; it's about identifying asymmetric hedges where you can risk a little to make a lot." — [Source: Lex Fridman Podcast]
  2. On The COVID Hedge: "In February 2020, we saw the world was about to close; we spent $27 million on credit protection that turned into $2.6 billion in three weeks." — [Source: Forbes Iconoclast]
  3. On Extrinsic Risk: "One of our eight criteria is avoiding companies with too much exposure to extrinsic risks like commodity prices or interest rates." — [Source: Daily Investor]
  4. On Asymmetric Returns: "The best investments are 'heads I win, tails I don't lose much'; the COVID hedge was the ultimate version of that." — [Source: Lex Fridman Podcast]
  5. On Market Timing: "We don't try to predict the market daily, but we do try to protect the portfolio when we see a systemic fire starting." — [Source: Pershing Square Letter]
  6. On Liquidity: "Never have an asset-liability mismatch; your fund should not be more liquid than the underlying investments it holds." — [Source: 20VC Podcast]
  7. On Black Swan Events: "You can't predict them, but you can build a portfolio of durable businesses that can survive them while others perish." — [Source: Lex Fridman Podcast]
  8. On Protecting Principal: "The first goal of investing is not to lose money; the second goal is to remember the first goal." — [Source: Lex Fridman Podcast]
  9. On Tail Risk: "Insurance is always expensive until the house is on fire; you have to be willing to pay for protection before you need it." — [Source: Forbes]

Part 5: Lessons from Failure — Resilience in Public Markets

  1. On Learning from Mistakes: "Experience is simply the name we give to our mistakes; the key is to analyze them until you've extracted every possible lesson." — [Source: The Knowledge Project]
  2. On The Valeant Loss: "Our biggest loss came from compromising on our core principles; we invested in a complex business with poor governance and paid the price." — [Source: Lex Fridman Podcast]
  3. On Cutting Losses: "If the facts change, you must change your mind; we sold Netflix at a loss in weeks because the long-term thesis had been broken." — [Source: Shortform]
  4. On Public Failure: "Investing is a business where you can look very silly for a long period of time before you are proven right—or proven wrong." — [Source: Varchev]
  5. On The Gotham Collapse: "Early failure at Gotham Partners taught me the brutal importance of liquidity and the dangers of open-ended funds in illiquid markets." — [Source: 20VC Podcast]
  6. On Emotional Detachment: "You cannot be emotional about a stock; the stock does not know you own it and it certainly doesn't care." — [Source: Fincash]
  7. On The Herbalife Short: "A short position has infinite risk and limited reward; it is a much harder way to make money than being long a great business." — [Source: Shortform]
  8. On Getting Back Up: "The measure of a man is not how he falls, but how quickly he gets back up and applies the lessons from the ground." — [Source: FS Blog]
  9. On Admitting Error: "There is no room for ego in investing; if you are wrong, admit it immediately and move on to the next opportunity." — [Source: Lex Fridman Podcast]

Part 6: Mental Models — The Psychology of Success

  1. On Rationality: "Investing requires pure rationality; you must train yourself to ignore the noise and focus exclusively on the facts and the math." — [Source: Varchev]
  2. On Compounding Progress: "Daily progress compounds just like money; if you get 1% better every day, you will be unrecognizable in a year." — [Source: Lex Fridman Podcast]
  3. On Contrarianism: "To earn a superior return, you must be willing to do something different from the crowd, which means being prepared to be lonely." — [Source: Fincash]
  4. On Focus: "Concentrate your energy on the few things that actually move the needle; most of what people call 'work' is just busy-ness." — [Source: Lex Fridman Podcast]
  5. On Patience: "The big money is not in the buying or the selling, but in the waiting; you have to give the compounding time to work." — [Source: Big Think]
  6. On Conviction: "Once you have done the work and know you are right, the market's opinion of your stock is irrelevant until it eventually catches up." — [Source: Gracious Quotes]
  7. On Simple Logic: "If you can’t explain the investment thesis to a ten-year-old in one minute, you probably don’t understand it well enough." — [Source: Forbes]
  8. On Avoiding Hubris: "Success is the worst teacher; it makes you think you can't fail, which is exactly when you make your biggest mistakes." — [Source: The Knowledge Project]
  9. On Intellectual Honesty: "Surround yourself with people who are encouraged to tell you why you are wrong; a room full of 'yes men' is a graveyard for capital." — [Source: Lex Fridman Podcast]
  10. On The Inner Scorecard: "Judge yourself by the quality of your process, not just the outcome of the trade; sometimes a good process leads to a bad result." — [Source: Lex Fridman Podcast]

Part 7: Corporate Governance & Leadership

  1. On Management Quality: "A great business with bad management will eventually become a bad business; we invest in people who think like owners." — [Source: Daily Investor]
  2. On Aligning Incentives: "Managers should be paid for creating long-term value, not for hitting short-term earnings targets that can be manipulated." — [Source: Lex Fridman Podcast]
  3. On The Role of the Board: "A board’s primary job is to hire and fire the CEO; if they can't do that effectively, they have failed the shareholders." — [Source: Pershing Square Letter]
  4. On Talent Density: "Hiring the wrong person is more expensive than leaving the position empty; we look for high integrity and high intelligence." — [Source: Lex Fridman Podcast]
  5. On Corporate Culture: "Culture is what happens when the CEO isn't in the room; you want a culture of accountability, not a culture of excuses." — [Source: The Knowledge Project]
  6. On Executive Compensation: "We hate 'pay for failure'; if a CEO destroys value, they should not leave with a hundred-million-dollar golden parachute." — [Source: Lex Fridman Podcast]
  7. On Shareholder Rights: "Shareholders are the owners of the company; the management and the board are the employees. It’s easy to forget that." — [Source: Forbes]
  8. On Operational Efficiency: "Most companies have far more fat than they realize; a fresh set of eyes can often find 20% in savings without hurting the product." — [Source: Observer]
  9. On The Long Game: "Managers who manage for the next quarter usually fail the next decade; we back leaders who have a 20-year vision." — [Source: FII9 Interview]

Part 8: Public Advocacy — Education, Society & Free Speech

  1. On DEI Frameworks: "The current DEI framework is problematic because it focuses on equality of outcome rather than equality of opportunity." — [Source: X Post]
  2. On Meritocracy: "Once you move away from merit-based systems in our universities or companies, you begin the slow decline of the institution." — [Source: Lex Fridman Podcast]
  3. On University Governance: "The governance at our top universities has become disastrous; free speech is suppressed if it deviates from the accepted narrative." — [Source: Business Insider]
  4. On The Role of X (Twitter): "X is the most important platform for free speech because it allows for immediate feedback and direct communication with policymakers." — [Source: Benzinga]
  5. On Antisemitism in Academia: "The 'oppressor vs. oppressed' ideology taught in schools has become a root cause of rising antisemitism on campuses." — [Source: DFTD Unite]
  6. On Corporate Activism: "Influential shareholders have a duty to speak up when they see institutions or companies moving in a direction that harms society." — [Source: X Post]
  7. On Media and Truth: "Traditional media has lost its way; platforms like X allow for 'community notes' and crowd-sourced truth that is harder to manipulate." — [Source: Business Insider]
  8. On Philanthropy: "We use the same activist mindset in philanthropy through the Pershing Square Foundation; we want to solve problems, not just write checks." — [Source: Forbes]
  9. On The Future of Education: "We must return to a system where the pursuit of truth is the highest goal of the university, not the pursuit of social engineering." — [Source: Lex Fridman Podcast]