Invest Like the Best with Patrick O'Shaughnessy

Henry Ellenbogen - Man Versus Machine - [Invest Like the Best, EP.452]

December 16, 2025

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  • Henry Ellenbogen's investment philosophy is rooted in scientific principles, emphasizing the need for companies to maintain a healthy balance with their ecosystem (customers, employees, shareholders, community) to achieve long-term persistence. 
  • Historically, only about 1% of public stocks (roughly 40 companies over a rolling decade) drive the majority of long-term returns, and 80% of these great compounders begin their journey as small-cap companies. 
  • Durable Capital Partners focuses on identifying 'Act II' teams—founders who leverage lessons from a prior success to tackle a new frontier—as these teams have a higher probability of building durable, compounding companies. 
  • Durable Capital's investment process emphasizes rigorous, scheduled look-backs (quarterly operating reviews and three-year post-mortems) to ensure intellectual honesty and continuous learning against initial underwriting assumptions. 
  • The firm prioritizes hiring and developing intellectually curious, resilient team members who excel both individually and in making their colleagues better, often favoring those with diverse, non-traditional backgrounds. 
  • The public market, despite the rise of private capital, remains a valuable mechanism for forcing necessary transitions, aligning incentives, and instilling financial discipline in companies undergoing significant strategic shifts, as exemplified by the Netflix transition. 

Segments

Origin of Investment Philosophy
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(00:05:22)
  • Key Takeaway: Early exposure to politics and a background in organic chemistry informed Henry Ellenbogen’s view that successful organisms, like companies, must exist in balance with their ecosystem.
  • Summary: Ellenbogen initially approached investing through the lens of science and biology, believing companies must balance investment across customers, employees, and shareholders to thrive long-term. His mentor at T. Rowe Price, Jack Laporte, reinforced this by focusing on small companies run by owner-minded people with good cultures. Studying the New Horizons Fund’s 50-year history revealed that only about 20 stocks drove the majority of its performance.
Identifying 1% of Great Companies
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(00:08:02)
  • Key Takeaway: Over a rolling 10-year period, only about 1% of the stock market (40 stocks) compound wealth at 20% annually or more, and 80% of these start as small caps.
  • Summary: The realization that a single stock (Walmart) could have outweighed the entire fund’s value if held led to a deep study of U.S. equity market history. The core philosophy is maximizing the probability of investing in the top 1% of companies that achieve significant compounding. These high-performers are often found in the small-cap universe at the start of their growth journey.
Patterns of Successful Compounders
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(00:12:16)
  • Key Takeaway: Successful compounders often exhibit a ‘good to great’ thesis, where existing companies leverage technological shifts like AI to substantially lower costs or gain revenue scale against competitors.
  • Summary: One key pattern is that founders who have succeeded before have a higher probability of succeeding again. Furthermore, great companies are diversified across the economy, not just in technology; for example, established players like Walmart and Costco successfully leveraged the cloud/mobile shift against smaller competitors. The ‘good to great’ thesis involves established firms using new technology to gain a permanent cost or distribution advantage.
Act Two Entrepreneurs and Durable Capital
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(00:20:34)
  • Key Takeaway: Act II teams, like the founders of Workday who previously built PeopleSoft, possess crucial clarity and exception management knowledge when tackling a new technological frontier like the cloud.
  • Summary: Act II entrepreneurs solve the same core problem with total clarity at the beginning, leveraging past success to align organization, people, and investors effectively. Durable Capital itself is Henry Ellenbogen’s Act II, structured with a clean sheet of paper to support this long-term compounding mission. The firm’s structure requires personnel capable of supporting companies from early private stages through public market maturity.
Dollar Cost Averaging Up Strategy
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(00:30:11)
  • Key Takeaway: Durable will only invest in an early-stage growth company if they can write an investment memo stating they would want to buy more shares at higher prices if the initial thesis proves correct.
  • Summary: For early-stage growth companies not yet competitively advantaged, the investment must be underwritten with the expectation of buying more as the company de-risks, proves its operating culture, and establishes its growth formula. Conversely, for established durable growth companies, volatility caused by short-cycle capital often creates opportunities to buy more when the stock is down due to macro concerns (e.g., Colliers during interest rate worries).
Market Structure and Agency Problems
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(00:35:02)
  • Key Takeaway: Short-term agency incentives (one- or three-month risk measurement) and quantitative trading drive 80-90% of institutional flow, leading to excessive market volatility that long-term investors can exploit.
  • Summary: Ellenbogen concluded that machines would win the short-term alpha game, forcing investors to focus on areas where human judgment regarding people and change provides an advantage. The high volatility in recent earnings seasons is attributed to capital being driven by short-cycle incentive models. Durable leans into this stress by deeply understanding the unique culture and capital allocation of companies like Colliers, allowing them to buy when short-term macro fears cause unwarranted sell-offs.
AI as Transformative Change
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(00:42:21)
  • Key Takeaway: AI is likely more impactful than the internet, not just affecting technology companies, but fundamentally changing businesses reliant on white-collar, IP-based work by enabling massive process streamlining (digital Kaizen).
  • Summary: Just as understanding China costs became mandatory for product-based businesses in the 2010s, understanding AI’s impact on IP-based work is now critical. Companies like Affirm are using AI to eliminate headcount growth while maintaining high revenue growth by leaning out processes previously requiring many employees. This mirrors the 40-year impact of physical Kaizen (DBS) on manufacturing, but applied to human processes, creating potential power-law advantages for early adopters.
Leadership Through Change
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(00:51:48)
  • Key Takeaway: The best leaders navigating discontinuous change must already be operating well, winning in their initial market, demonstrating resiliency, and maintaining humility to constantly learn and update their perspective.
  • Summary: Leaders must be executing well before change hits, ensuring they have the organizational fortitude to adapt without falling into a turnaround situation. Resiliency, proven through past stress (like Max Levchin’s experience at PayPal/Slide), is key for implementing necessary shifts like AI integration. Furthermore, leaders must be humble enough to constantly update their views, as demonstrated by Duolingo’s rapid, AI-assisted development of the successful Chess product.
Investment Memo Structure Review
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(01:06:50)
  • Key Takeaway: Investment memos must clearly articulate owner-like leadership and capital allocation that drives durable growth.
  • Summary: Investment memos define success by a leader’s ability to gain market share through cycles and allocate capital to increase asset base value. Durable conducts rigorous operating reviews against these initial underwriting assumptions quarterly. The firm instituted a mandatory three-year look-back review for every investment to learn from deviations between projections and reality.
2022 CEO Tour Insights
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(01:09:14)
  • Key Takeaway: The decade of free money led to simplifying assumptions across the market, inflating the number of viable compounders.
  • Summary: In 2022, Henry Ellenbogen felt expertise was needed to address the market’s simplifying assumptions based on nearly a decade of free money, where negative real rates made unprofitable growth logical. Historically, in positive real rate environments, there are about 40 compounders, but during the free money period, there were three times as many (120). Companies only needed to show progress toward profitability, not actual returns above the cost of capital, which is a pattern that won’t persist.
Media Industry Analysis
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(01:15:23)
  • Key Takeaway: The most durable assets in media were cable networks, predicated on a closed system that broadband eventually broke.
  • Summary: Henry Ellenbogen’s early media analysis identified cable networks, backed by figures like John Malone, as the 20% growth, 20% ROE compounders. This success was predicated on a closed system of content distribution and linear TV scheduling that maximized revenue based on consumer availability. Broadband technology, seeded during the TMT bubble, enabled platforms like YouTube and Netflix, which ultimately dismantled this oligopolistic closed system.
Hiring and Developing Talent
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(01:19:18)
  • Key Takeaway: Durable aims to build an investment firm that will be better after the founders leave by developing talent rigorously.
  • Summary: Durable structures incentives and ethos to ensure the firm improves beyond the initial partners’ tenure, often hiring young talent from non-traditional finance backgrounds. The firm values deep intellectual curiosity, team-based competition, and resilience, recognizing that junior analysts can provide the most valuable fresh perspectives. Excellence at Durable requires both individual skill and actively making colleagues better, which is measured via specific feedback in 360 reviews.
Intellectual Honesty in Reviews
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(01:27:56)
  • Key Takeaway: Performance reviews and look-backs at Durable are conducted without blame, focusing purely on intellectual honesty and self-improvement.
  • Summary: When reviewing KPIs or three-year look-backs, the goal is not to assign praise or blame but to clinically assess what happened and why it deviated from the plan. This process encourages self-critique and allows colleagues to lend their unique lenses to subtle performance outcomes. This culture of humility ensures that data is shared openly to facilitate collective learning and improvement.
Lessons from Founder Success/Failure
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(01:29:11)
  • Key Takeaway: Firms that fail to architect their system for success from day one often suffer from conflicts that undermine long-term accomplishment.
  • Summary: Successful firms architect their systems early to avoid compromises, hiring only those who could eventually lead the entire investment organization. Durable prioritizes performance and growth, breaking ties in favor of investment excellence, which dictates when they seek new capital deployment. Successful firms prove that the public market path to building a compounder is clear, often involving painful transitions where stock prices drop significantly.
Value of Public Market Discipline
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(01:33:05)
  • Key Takeaway: The public market provides a proven path for generational companies by enforcing discipline through daily performance marks and investor scrutiny.
  • Summary: While staying private avoids short-cycle performance pressure, the public market path to building a compounder is proven, often involving a 50% stock drawdown during necessary transitions like Netflix’s shift to streaming. Public scrutiny forces companies to balance growth, innovation, and profitability, with the CFO function setting standards that drive sharp decision-making. Realigning internal teams to the correct market valuation during a transition is culturally beneficial, rewarding those who commit.
Two Types of Competitive Greatness
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(01:41:35)
  • Key Takeaway: Durable embraces the ’elevate the game’ approach to competition, rooting for competitors while remaining fiercely competitive when playing against them.
  • Summary: Henry contrasts the fierce, driving competitiveness of Michael Jordan with the style of elevating the game exemplified by Steph Curry and the Warriors, which Durable aligns with. This philosophy extends to investors and former portfolio companies; even after selling a stock, Durable continues to support the entrepreneur’s success. This approach is rooted in fiduciary duty and a desire to see high-quality people win, even if it means selling their stock for better risk/reward.
Kindest Act Received
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(01:45:41)
  • Key Takeaway: Henry’s mother showed kindness by supporting his adult decision to drop out of Harvard for a political role, demanding responsibility for the consequences.
  • Summary: Henry’s mother supported his decision at age 19 to drop out of Harvard to become the campaign manager for a U.S. House representative, despite her non-Zuckerberg ethos. She affirmed her unconditional support but required him to take full financial responsibility for his education if he chose to leave. This act taught him that major decisions require thoughtfulness, and support comes with the expectation of personal accountability for the consequences.