Henry Ellenbogen

Background

Henry Ellenbogen is the Founder, Managing Partner, and Chief Investment Officer of Durable Capital Partners LP, an investment firm he founded in 2019 and headquartered in Bethesda, Maryland ¹². Durable manages approximately $18.2 billion in assets as of March 2025, investing across both public and private markets ³⁴.

Before founding Durable, Ellenbogen spent 18 years at T. Rowe Price Associates (2001–2019), where he rose to Vice President, Chief Investment Officer for U.S. Equity Growth, and lead Portfolio Manager for the U.S. Small-Cap Growth Equity Strategy ¹⁵. He joined T. Rowe Price in 2001 as an equity investment analyst covering internet, media, and telecommunications companies, winning the “Best of the Buy Side” award in 2003, 2005, and 2009 ¹⁶.

From 2004 to 2009, Ellenbogen managed the T. Rowe Price Media and Telecommunications Fund, which received seven Lipper Performance Achievement Certificates for ranking first in its category ¹. He took over the flagship New Horizons Fund in 2010 and ran it until his departure in 2019. Under his management, the fund delivered a total return of approximately 375% (~18.9% CAGR), growing AUM from $8.6 billion to $25 billion ⁶⁷. When he took over, the fund ranked 32nd out of 217 peers over the prior decade; by the end of 2018, it stood first out of 228 ⁷. He beat the S&P 500, the Russell 2000 Growth benchmark, and his peers by over 5% annually despite managing the largest pool of small-cap money in the country ⁷.

While at T. Rowe Price, Ellenbogen pioneered crossover investing by leading private-market rounds in companies including Workday, Twitter, Atlassian, Twilio, Warby Parker, and Sweetgreen before their IPOs ¹⁵.

Prior to T. Rowe Price, Ellenbogen served as Chief of Staff to U.S. Representative Peter Deutsch and worked as a Summer Associate at Goldman Sachs ¹. He holds a bachelor’s degree in History and Science from Harvard College (magna cum laude), a J.D. from Harvard Law School, and an MBA from Harvard Business School, where he was named a Baker Scholar ¹.

Ellenbogen has been a member of the Barron’s Roundtable, an adjunct professor at NYU Graduate School of Politics, a member of the Investment Committee at the Smithsonian Institution, and Chairman of The Posse Foundation ¹. In 2025, he was appointed to the National Geographic Society Board of Trustees ⁸.

Stated Thesis

(Self-reported: These represent what Ellenbogen says publicly about his investing approach. See Inferred Thesis for analysis of actual investment behavior.)

Durable Capital Partners publicly describes its mission as identifying companies with the tagline: “The right elements build businesses that last” ². Ellenbogen has stated that the firm’s goal is to find rare “compounders” — companies that can compound wealth at 20%+ annually over a decade ⁹¹⁰.

Ellenbogen has articulated a “1% framework,” stating: “Over a rolling 10 year period, you have about 40 stocks that compound well at 20% a year or go up a little bit over 6x. So about 1% of the stock market is the valedictorians. And that’s what we want to go do” ⁹¹⁰. He has noted that approximately 80% of those compounders start their journey as small-cap companies ⁹.

On investment criteria, Ellenbogen emphasizes “Act II” entrepreneurs — founders who have built successful companies before and bring lessons from prior ventures to new opportunities. He has described this as seeking founders with deep knowledge of system failures and customer needs, creating what he terms a “human moat” ¹⁰¹¹.

Ellenbogen has stated: “Our overall goal is to own companies that are innovative early-stage or durable growers” ⁶. He has emphasized that Durable does not separate public and private investing: “We don’t have private investors and we don’t have public investors… We have world-class security analysts” ⁶.

On management quality, Ellenbogen has said: “Management teams need to be honest about their challenges. We like leaders who are data-driven” and looks for leaders who have “the ability to scale people, processes, and systems” and “can create a culture that can adapt” ⁶.

Ellenbogen views companies through a biological lens, stating: “Companies are like biological organisms. They are either fundamentally healthy or out of balance” ⁶. He favors physical-world advantages that are difficult to replicate — what he calls “messy moats” — such as distribution networks and operational infrastructure ¹⁰.

On capital deployment, Ellenbogen has stated: “If capital isn’t going to be free, we have transitioned from an era driven by speed and momentum investing to an era of skill and judgment. That means it is a stockpicker’s market” ¹².

Inferred Thesis

The analysis below is based on 17 verified private investment rounds across 14 unique companies by Durable Capital Partners, identified from press releases, Crunchbase, Tracxn, and news coverage. Durable has made approximately 52 total investments (public and private combined) since founding in 2019 ¹³. The private investment analysis below focuses on the venture/growth equity side.

Stage distribution (based on 17 verified private investment rounds): - Late-stage/pre-IPO (Series D+): 12 of 17 (71%) — Figma (Series D and E), Affirm (Series G), DoorDash (Series H), Deliveroo (Series H), Celonis (Series D), ServiceTitan (Series F), Brex (Series D), Parloa (Series C and D), Duolingo (Series H) - Growth stage: 5 of 17 (29%) — Rapyd, Clearwater Analytics, Facet Wealth (Series C), Honest Health, Evolve, VieCure

Durable is overwhelmingly a late-stage crossover investor in private markets, participating in Series D and later rounds. This is consistent with Ellenbogen’s public-market roots and the firm’s unified public/private approach.

Sector breakdown (based on 14 unique private portfolio companies): - Technology / enterprise software: 5 of 14 (36%) — Figma, Celonis, ServiceTitan, Parloa, Clearwater Analytics - Fintech: 3 of 14 (21%) — Affirm, Rapyd, Facet Wealth - Consumer / delivery: 2 of 14 (14%) — DoorDash, Deliveroo - Healthcare: 2 of 14 (14%) — Honest Health, VieCure - Fintech / enterprise: 1 of 14 (7%) — Brex - Travel / hospitality: 1 of 14 (7%) — Evolve - Education: 1 of 14 (7%) — Duolingo

Note: Some companies (e.g., Coupang, SoFi, Eventbrite) are known Durable holdings but their specific private investment rounds could not be independently verified, so they are excluded from this analysis.

Geographic concentration (based on 14 unique private portfolio companies): - United States: 10 of 14 (71%) - International: 4 of 14 (29%) — Deliveroo (UK), Rapyd (UK/Israel), Celonis (Germany), Parloa (Germany)

Check size patterns: Durable invests at significant scale in private rounds. Known examples include co-leading Affirm’s $500M Series G ¹⁴, leading Deliveroo’s $180M Series H ¹⁵, leading Duolingo’s $35M Series H ¹⁶, leading Facet Wealth’s $100M Series C ¹⁷, and leading Evolve’s $100M round ¹⁸. Typical check sizes appear to be $20M–$200M+ in late-stage private rounds.

Co-investor patterns: Durable frequently co-invests with large crossover funds and sovereign wealth funds, including GIC (Affirm), Fidelity Management (Deliveroo), General Atlantic (Duolingo), Morgan Stanley Counterpoint Global (Figma), T. Rowe Price (Celonis), Tiger Global (ServiceTitan), Warburg Pincus (Clearwater Analytics), and Sequoia Capital (ServiceTitan) ^141516192021.

Founder profile preferences: Ellenbogen’s “Act II” framework suggests a preference for experienced, repeat founders. Portfolio examples include Max Levchin at Affirm (previously PayPal co-founder) and Dave Duffield at Workday (previously PeopleSoft founder) ¹⁰¹¹. He also backs mission-driven founders — Luis von Ahn at Duolingo was cited as exemplifying the mission-driven, culture-focused leader Ellenbogen seeks ¹⁶.

Notable patterns not in stated thesis: - Durable functions more as a crossover hedge fund than a traditional venture firm — it holds concentrated public equity positions and makes selective late-stage private investments, typically 5–10 new investments per year ⁹. - The firm has shown willingness to invest internationally (4 of 14 verified private companies, 29%), particularly in European growth companies, despite being U.S.-headquartered. - Several portfolio companies (Affirm, DoorDash, Duolingo, Deliveroo, ServiceTitan, Figma) went on to IPO after Durable’s investment, consistent with a pre-IPO crossover strategy.

Portfolio

Private investments by Durable Capital Partners (verified):

This table represents approximately 17 unique private companies out of an estimated 52 total investments (public and private) — roughly 33% of the portfolio. Many of Durable’s investments are in public equities acquired on the open market (e.g., RBC Bearings, MercadoLibre, Coupang, API Group, Colliers International) and are not included in the private investment table above ³.

In Their Own Words

On what he looks for in investments: “Duolingo is the kind of business that matches what we look for in our investments: they are mission-driven, have a great culture, and great people that can compound significantly over time.” — Henry Ellenbogen, press release for Duolingo Series H, November 2020 ¹⁶

On the fintech-as-a-service category: “I believe the Fintech-as-a-Service category has tremendous potential.” — Henry Ellenbogen, press release for Rapyd investment, December 2019 ²²

On Facet Wealth: “Facet is doing something innovative in personal finance. It stands at the forefront of an era in which people will benefit from the use of new technology that results in personalized financial plans suited for their specific needs and aspirations. With a strong team, we believe Facet is well-positioned for sustainable, long-term success.” — Henry Ellenbogen, Institutional Investor, January 2022 ¹⁷

On Evolve: “Evolve is at the forefront of the next wave of innovation in the vacation rental category.” — Henry Ellenbogen, press release for Evolve investment, February 2022 ¹⁸

On investing in small-cap growth: “Investing in small-cap growth stocks is an immensely creative process, where creativity and success are defined by the ability to see what others — most market participants — don’t see.” — Henry Ellenbogen, as quoted in Frederik Journals profile ⁶

On the compounding framework: “There’s 4,000 public stocks. How many of them truly are great? Over a rolling 10 year period, you have about 40 stocks that compound wealth at 20% a year or go up ~6x. So about 1%.” — Henry Ellenbogen, Invest Like the Best podcast, Episode 452, December 2025 ⁹

On portfolio management discipline: “We need to grow our roses and cut our weeds.” — Henry Ellenbogen, as quoted in Frederik Journals profile ⁶

On investment process: “We’re a writing culture, because at the end of the day, human beings are innately human. When we are involved in something, it’s very hard to have that executive distance that you need to do to really hold yourself accountable to what you thought and actually hold the companies accountable to what you would like them to do.” — Henry Ellenbogen, Invest Like the Best podcast, Episode 452, December 2025 ⁹

On market regime change: “If capital isn’t going to be free, we have transitioned from an era driven by speed and momentum investing to an era of skill and judgment. That means it is a stockpicker’s market.” — Henry Ellenbogen, Barron’s Roundtable, 2025 ¹²

What Founders Say

Patrick O’Shaughnessy, host of the Invest Like the Best podcast, reported consistent feedback from founders about Ellenbogen: “I always hear the same thing from founders who’ve met Henry: ‘he understood my business faster than anyone.’” In a follow-up post, O’Shaughnessy noted: “The most common [text] from founders about Henry: ‘he understood my business faster, and then deeper, than anyone.’” ²⁶²⁷

No additional independently sourced founder testimonials were found through dedicated searching. The quotes above are second-hand reports from an interviewer, not direct founder statements. Durable Capital Partners’ website does not feature founder testimonials ².

Sources