Stone Run Capital

Stone Run Capital

Stone Run Capital was founded in 2009 as a New York-based investment manager serving individuals, family offices, and charitable organizations. The firm constructs concentrated equity and fixed-income portfolios, deliberately limiting exposure to approximately 35 companies that lead their respective niche industries and have demonstrated an ability to capture market share over time. The strategy is rooted in long-term, fundamental research. Stone Run targets businesses with durable competitive advantages, secular growth trajectories, and valuations that offer a margin of safety. The firm's equity selection focuses on companies it believes can compound capital over a three-to-five-year horizon. Many core positions have been held for more than five years. Fixed-income management complements the equity sleeve, though the firm has not publicly disclosed its credit-selection methodology or benchmark. Stone Run states it works with a network of partner firms to deliver a full-service client experience, including custody and reporting integrity, though the identities of those partners are not public. Stone Run does not publicly disclose its total assets under management or deployment figures. The firm's website lists no additional offices beyond its New York headquarters and does not name any investment professionals or firm principals. No adjacent vehicles — such as philanthropic foundations, real-asset arms, or co-investment clubs — are disclosed. The firm has not published any verifiable operational events, personnel appointments, or fund launches within the last 24 months. Stone Run's structural identity sits between a traditional wealth manager and a concentrated investment partnership. It accepts outside capital rather than serving a single family, yet its naming convention and geological metaphor deliberately evoke permanence and alignment. The firm's position as a fiduciary — managing capital for endowments and families rather than marketing funds to a broad retail base — gives it a different incentive structure than asset-gathering managers, though without disclosed principals or scale, the depth of that alignment remains opaque.