D1 Capital Partners

#### I. Institutional Overview: The Psychological Portrait and Scale Analysis of D1 Capital Partners As we dissect the 13F filing for **D1 Capital Partners**, led by the formidable **Dan Sundheim**, for the fourth quarter of 2025, we are looking at a portfolio that serves as a masterclass in high-conviction, growth-oriented investing. Dan Sundheim, often categorized as a "Tiger Cub" due to his pedigree at Viking Global Investors, has carved out a unique identity for D1 Capital. The firm is known for its hybrid approach, blending public equity markets with significant private equity investments. However, the 13F report provides us with the essential window into the public side of this strategy, revealing a portfolio valued at approximately **$10.70 billion** as of December 31, 2025. **Scale and AUM Dynamics** The reported value of **$10,702,130,196** represents a substantial pool of capital, yet it is the concentration of this capital that reveals Sundheim’s psychological state. With only **42 stocks** in the portfolio, D1 Capital is not interested in "closet indexing" or broad market exposure. Instead, the firm operates with a "best ideas" philosophy. When an institution of this scale manages only 42 positions, it implies that each position must undergo rigorous scrutiny and possess a clear path to alpha generation. The average position size is roughly **$254 million**, but the reality is even more skewed toward the top, where the largest holding, **CART (Maplebear Inc.)**, accounts for nearly 10% of the entire public portfolio. **The Psychological Portrait: Aggressive but Calculated** Dan Sundheim’s investment style can be described as "concentrated growth with an industrial backbone." Unlike many of his peers who might be 60-70% weighted in pure-play Technology, Sundheim exhibits a more diversified appetite for growth. His willingness to hold significant stakes in **Industrials (21%)** and **Consumer Discretionary (20.75%)** suggests a belief in "tangible growth"—companies that provide essential services or dominate physical and digital marketplaces. The psychology here is one of **high conviction**. Sundheim is not afraid to let his winners run, as seen in the long-term holding of **CART**, nor is he hesitant to pivot aggressively when he sees a new opportunity, as evidenced by the massive additions to **SE (Sea Limited)** and **MELI (MercadoLibre)** this quarter. The portfolio reflects a manager who is comfortable with volatility in exchange for superior long-term compounding. He is looking for "platform" companies—businesses that own the infrastructure of their respective industries, whether that is e-commerce in Southeast Asia, environmental services in North America, or social media engagement via **RDDT (Reddit)**. **Scale Trends and Market Positioning** The $10.7B valuation suggests that D1 Capital remains a "mid-sized giant" in the hedge fund world. It is large enough to take meaningful "cornerstone" stakes in mid-cap companies but nimble enough to exit positions like **NU (Nu Holdings)** or **PM (Philip Morris)** entirely within a single quarter without causing catastrophic market disruption. This nimbleness is a key competitive advantage. In Q4 2025, we see a manager who is actively "pruning the garden"—exiting 9 positions and entering several new ones—indicating a high level of portfolio turnover that is characteristic of a tactical, opportunistic growth seeker rather than a passive "buy and hold" investor. In summary, the D1 Capital portrait is one of a **sophisticated growth hunter**. Sundheim is leveraging his $10.7B scale to dominate specific niches, favoring companies with strong pricing power and dominant market share, while maintaining the flexibility to rotate capital into the next generation of global platforms. --- #### II. Sector Allocation Analysis: Macro Signals and Track Selection The sector allocation of D1 Capital in Q4 2025 provides a fascinating roadmap of where Dan Sundheim believes the next leg of economic growth will emerge. By analyzing the weights and the shifts between sectors, we can infer a macro judgment that favors "real-world" infrastructure and global consumer platforms over traditional high-beta software or defensive staples. **Table 2.1: Sector Allocation Weights** | Sector | Weight (%) | Strategic Orientation | | :--- | :--- | :--- | | **Industrials** | 21.00 | Core Infrastructure & Services | | **Consumer Discretionary** | 20.75 | Global E-commerce & Discretionary Spend | | **Communication Services** | 17.47 | Social Media & Digital Platforms | | **Technology** | 11.30 | Specialized Software & Semiconductors | | **Materials** | 9.57 | Industrial Inputs & Chemicals | | **Financials** | 7.03 | Capital Markets & Payments | | **Real Estate** | 6.05 | Specialized REITs | | **Consumer Staples** | 3.01 | Food Distribution | | **Healthcare** | 2.70 | Medical Technology | | **Utilities** | 0.84 | Regulated Power | | **Others** | 0.28 | Miscellaneous | **Concentration Analysis: The "Big Three" Focus** The top three sectors—**Industrials, Consumer Discretionary, and Communication Services**—collectively account for **59.22%** of the portfolio. This is a highly focused allocation. It suggests that D1 Capital is betting on a "barbell" strategy: one side consists of heavy-duty, cash-flow-positive industrial and material companies (**CLH, FLS, JHX**), and the other side consists of high-growth, high-engagement digital platforms (**RDDT, MELI, SE, AMZN**). **Sector Rotation Signals: The Industrial Pivot** The **21% weight in Industrials** is perhaps the most telling signal. In a market often obsessed with AI and software, Sundheim has placed his largest bet on the "physical" economy. This includes environmental services, flow control equipment, and transportation. This allocation suggests a macro view that favors companies benefiting from **re-industrialization, infrastructure upgrades, and environmental compliance**. These are businesses with high barriers to entry and "sticky" revenue models. By maintaining such a high weight here, D1 is signaling that they expect these "old economy" growth stories to provide a stable foundation (or "ballast") for the portfolio. **Consumer Discretionary vs. Consumer Staples** The stark contrast between **Consumer Discretionary (20.75%)** and **Consumer Staples (3.01%)** reveals a high degree of optimism regarding the consumer's long-term purchasing power, specifically in digital and international markets. D1 is not hiding in defensive "toothpaste and soda" stocks. Instead, they are aggressively positioned in e-commerce giants like **MercadoLibre** and **Sea Limited**. This indicates a belief that the "secular shift" toward online commerce still has significant runway, particularly in emerging markets where middle-class expansion continues to drive discretionary spending. **Communication Services: The Platform Bet** With a **17.47% weight**, Communication Services is a cornerstone of the D1 strategy. This is largely driven by positions in **Reddit (RDDT)** and **Meta Platforms (META)**, along with new entries like **Spotify (SPOT)**. Sundheim’s logic here appears to be centered on **attention monopolies**. These companies own the "digital real estate" where consumers spend their time. In an era of fragmented media, the value of a platform that can aggregate and mon ---