Master Profile

Clifford Sosin: Investment Profile & 13F Holdings

CAS Investment Partners

Clifford Sosin's investment career, philosophy, and public 13F holdings through CAS Investment Partners.

Early Life and Education

Sosin's educational background combines the rigorous logic of engineering with the business thinking of economics, laying the foundation for his later unique “mental models” approach to investing. Educational Background: He graduated from the prestigious liberal arts college Swarthmore College, earning a Bachelor of Science in Engineering (High Honors) and a Bachelor of Arts in Economics. This interdisciplinary background enables him to deconstruct complex business models through a systems-engineering lens. Early Career: Investment banking and restructuring: He began his career at Houlihan Lokey, advising on financial restructurings. This experience gave him insight into why businesses fail. Buy-side experience: He then joined Silver Point Capital, a hedge fund focused on distressed debt and credit investments. UBS tenure: Before launching his own firm, he served as a director in the Fundamental Investment Group at UBS, analyzing equities and high-yield bonds.

Investment Career

Sosin's career perfectly embodies the principle that “volatility is not risk; permanent loss of capital is the real risk.” His track record has been highly dramatic, yet with astonishing long-term returns. Founding CAS (2012): In October 2012, Sosin left UBS and founded CAS Investment Partners in Westport, Connecticut. A roller coaster of performance: Highlights: In 2019 and 2020, his fund posted staggering returns of 64.5% and 96.5%, respectively, largely driven by successful bets on Carvana and Herbalife. Darkest hour (2022): In 2022, as Carvana's stock collapsed, Sosin Partners suffered a devastating blow, with net asset value falling as much as 77%. Remarkable comeback (2023–2024): Facing the huge drawdown, Sosin did not cut losses and exit. Instead, he wrote lengthy letters to investors explaining his rationale and held firm. In 2023, the fund rebounded nearly 80%; in 2024, as Carvana's stock surged, the fund once again became one of the world's top-performing hedge funds. Core holdings: His portfolio is extremely stable and concentrated, with long-term high-conviction positions including: Carvana (online used car retailer), Hilton Grand Vacations (timeshare), Capital One (consumer finance), World Acceptance Corp (subprime credit), and Cardlytics (bank marketing platform).

Investment Philosophy

Sosin's investment philosophy is deeply influenced by Charlie Munger, emphasizing the use of “mental models” to reason through a business's endgame. Hyper-concentration: Sosin believes that if you truly understand a company, you should dare to bet big. His portfolio typically holds just 5–6 stocks, and the top two positions may account for 60–80% of total assets. He views diversification as a shield for ignorance. “Contained” vs. “Uncontained” businesses: This is Sosin's unique analytical framework. He seeks businesses with “contained” characteristics, meaning clear competitive advantages, durable moats, and business models not easily disrupted by external technological change. Not just cheap, but “inevitability”: He doesn't merely buy bargains; he buys business models he believes will “inevitably win.” For example, his Carvana investment was based on his engineering calculation that its vertically integrated e-commerce model would inevitably be superior to traditional dealerships in both cost and customer experience, and that short-term financial losses were simply the price of building long-term scale advantages. Field research and first principles: He relies heavily on firsthand information. When investing in Carvana, he personally visited parking lots to count cars and studied logistics systems, verifying whether the company's operational efficiency matched what was reported in financial statements.

Personal Life

In his personal life, Sosin maintains extreme discretion and focus, mostly based in Westport, Connecticut. Residence: He has long resided in Westport, Connecticut, a hub for hedge fund managers (Bridgewater's Dalio also lives there). Personality: Peers describe him as having tremendous intellectual confidence and an exceptionally stable emotional core. Amid the 77% drawdown in 2022, he calmly dissected Carvana's debt structure and survival probability in a podcast with clear logic—a psychological fortitude few can match. Family: Public records show he co-owns property with a partner named Taylor. He lives privately and is rarely seen in lifestyle media.

Books and Writings

Although Sosin has not published a book, his “Letters to Partners” and high-quality podcast interviews are treasured resources in the investment community. Notable views / letters: April 2022 letter: As Carvana plummeted, he wrote: “From the perspective of business history, few great companies are built without setbacks. In hindsight, these challenges often prove to be mere blips on the company's unstoppable rise.” This letter became a psychological template for contrarian investing. On moats: “A good business is like a castle. The moat is not for defense, but to allow the ecosystem inside to evolve undisturbed.” Recommended podcasts: His interviews on “Invest Like the Best” and “Yet Another Value Podcast” are re-listened to by many investors, especially his discussions on “how to build mental models.”