United States – October 31, 2026 -- BlackBird Financial LP returned 62.2% in 2025 with a portfolio of fewer than ten holdings, against a 17.9% gain for the S&P 500, according to the firm's account of its investment approach.
Spinner holds fewer than ten stocks under a 'punchcard' model
Founder and Chief Investment Officer Judah Spinner calls the strategy the "punchcard approach." It borrows from Warren Buffett's metaphor of an investor limited to twenty investments over a lifetime. Each holding is a researched thesis on the structural dynamics of a whole industry, not a single stock pick.
Spinner's investments in offshore support vessels and building materials distribution followed months of study. The work covered the competitive landscape, supply-side constraints and long-term demand drivers.
Spinner rejects spreading capital across dozens of stocks
Spinner argues that in a fifty-stock portfolio even a spectacular winner adds only a marginal gain. He also contends that when a single error costs little, the incentive for exhaustive research falls.
BlackBird says it passes on roughly 99% of the ideas it sees. Only investments offering both a meaningful margin of safety and a compelling structural thesis clear its threshold.
Concentration amplifies losses as well as gains, Spinner warns
Spinner states that the approach magnifies downside as well as upside. He considers it unsuitable for investors who cannot tolerate short-term volatility.
The firm frames its method as rooted in the Graham and Buffett value tradition, adapted to current markets. It rests on the view that markets are not perfectly efficient and that human psychology creates persistent mispricings.