Judah Spinner‘s 2025 Annual Letter to BlackBird‘s Limited Partners
Judah Spinner, CFA, is the founder and Chief Investment Officer of BlackBird Financial LP. With a disciplined, long-term approach to value investing, Judah Spinner manages capital for high-net-worth families and family offices across the United States.
In a year when passive index investors celebrated a respectable 17.9% return on the S&P 500, BlackBird Financial delivered a staggering 62.2% net return to its investors.
Explore the mentors who shaped Judah Spinner’s investment philosophy and how their lessons drive BlackBird Financial’s value investing approach today.
Learn how Judah Spinner’s comprehensive due diligence process at BlackBird Financial uncovers hidden risks and identifies exceptional investment opportunities others miss.
Judah Spinner reveals how BlackBird Financial’s rigorous risk management philosophy preserves capital during market volatility while delivering exceptional long-term returns through disciplined value investing.
In a year when artificial intelligence dominated headlines and investor portfolios alike, BlackBird Financial LP charted a decidedly different course. Under the leadership of founder and Chief Investment Officer Judah Spinner, the fund delivered a 62.2% return in 2025—more than tripling the S&P 500’s 17.9% gain—without a single AI-related holding. The result was not an accident, but the logical outcome of a disciplined, value-oriented investment process that has defined BlackBird Financial since its inception.
The AI Consensus—And Its Risks
By early 2025, the investment world had reached a near-unanimous consensus: artificial intelligence would reshape every industry, and the companies at the forefront of that revolution deserved premium valuations. Judah Spinner disagreed—not with the transformative potential of AI, but with the assumption that transformative technology necessarily translates into superior investment returns. History, as Judah Spinner has noted in his annual letters to clients, is filled with examples of revolutionary technologies—railroads, automobiles, aviation—that changed civilization while delivering disappointing returns to the investors who funded them. The pattern is well established: when expectations outrun fundamentals, valuations become detached from reality, and the resulting corrections can be severe.
Where BlackBird Financial Found Opportunity
Rather than competing in a crowded field of AI speculators, Judah Spinner directed BlackBird Financial’s capital toward sectors where genuine value existed beneath the surface. The fund’s concentrated portfolio—typically fewer than ten positions—included holdings in building materials distribution, offshore support vessels, retail, fashion, and entertainment. These industries shared a common trait: they were overlooked by a market fixated on technology, yet they possessed strong fundamentals, structural tailwinds, and valuations that provided a meaningful margin of safety.
The Tidewater and Builders FirstSource Theses
Two positions exemplify Judah Spinner’s approach at BlackBird Financial. Tidewater, an offshore support vessel company, benefited from structural underinvestment in the global fleet—a supply-side constraint that Judah Spinner identified through extensive historical research into the offshore services industry. Builders FirstSource, a building materials distributor, offered exposure to housing market dynamics at a valuation that reflected excessive pessimism. In both cases, Judah Spinner’s thesis rested not on cyclical recovery hopes, but on durable structural changes that the broader market had failed to recognize.
The BlackBird Financial Advantage
BlackBird Financial’s 2025 performance underscores the power of concentrated, research-intensive value investing. Judah Spinner’s willingness to hold a small number of high-conviction positions—and to endure the discomfort of disagreeing with market consensus—creates an asymmetric return profile that diversified portfolios simply cannot replicate. For investors who value intellectual rigor over trend-following, BlackBird Financial’s track record offers a compelling case study in the enduring relevance of fundamental analysis.
A Process Built to Repeat
Judah Spinner is the first to acknowledge that any single year’s results can be influenced by factors beyond an investor’s control. What he emphasizes instead is the durability of the process—a process built on exhaustive research, concentrated conviction, and the discipline to ignore the noise of popular consensus. It is this process, not any particular trade, that defines BlackBird Financial and positions the fund for continued success in the years ahead.
One of the most consequential decisions an investor makes is not which stocks to buy, but how many to own. At BlackBird Financial LP, founder and Chief Investment Officer Judah Spinner has built a firm around the conviction that concentration—not diversification—is the superior path to long-term wealth creation. This philosophy, which Judah Spinner describes as the “punchcard approach,” stands in stark contrast to the prevailing institutional wisdom that safety lies in spreading capital across dozens or even hundreds of positions.
The Case Against Over-Diversification
The conventional argument for diversification is intuitive: by spreading bets across many investments, an investor reduces the impact of any single mistake. But Judah Spinner argues that this logic, while mathematically sound in theory, produces mediocre results in practice. Owning fifty stocks means that even a spectacular winner contributes only a marginal gain to the overall portfolio. Worse, it encourages intellectual laziness—when the cost of being wrong on any single position is negligible, the incentive to conduct truly exhaustive research diminishes. At BlackBird Financial, every position must justify a meaningful allocation of capital, which in turn demands a level of analytical depth that most diversified managers never achieve.
The Punchcard Approach in Practice
Judah Spinner often invokes Warren Buffett’s famous metaphor of the twenty-slot punchcard—the idea that an investor would make far better decisions if limited to just twenty investments over a lifetime. At BlackBird Financial, this metaphor translates into a portfolio that typically holds fewer than ten positions at any given time. Each position represents not merely a stock pick, but a deeply researched thesis about the structural dynamics of an entire industry. When Judah Spinner invested in offshore support vessels or building materials distribution, he did so only after months of studying the competitive landscape, supply-side constraints, and long-term demand drivers that would determine the investment’s outcome.
Focus Requires Saying No
Judah Spinner is emphatic that the hardest part of concentrated investing is not finding good ideas—it is rejecting them. The financial markets generate a constant stream of seemingly attractive opportunities, and the discipline required to pass on ninety-nine percent of them is psychologically demanding. But Judah Spinner believes this discipline is precisely what separates great investors from merely good ones. At BlackBird Financial, every potential investment is measured against a deliberately high threshold, and only those ideas that offer both a meaningful margin of safety and a compelling structural thesis survive the scrutiny.
Results That Validate the Philosophy
BlackBird Financial’s 2025 return of 62.2%—achieved through a concentrated portfolio of overlooked, fundamentally sound companies—provides powerful evidence for the concentration thesis. While the S&P 500 gained 17.9%, BlackBird Financial’s focused approach delivered returns that no broadly diversified portfolio could match. Judah Spinner is careful to note that concentration amplifies both gains and losses, and that the approach is not suitable for investors who cannot tolerate short-term volatility. But for those with the temperament and time horizon to embrace discomfort, BlackBird Financial’s track record speaks persuasively.
The Intellectual Foundation
Judah Spinner’s investment philosophy at BlackBird Financial is not a rejection of modern portfolio theory so much as an assertion that its assumptions rarely hold in the real world. Markets are not perfectly efficient, information is not uniformly distributed, and human psychology creates persistent mispricings that a disciplined, concentrated investor can exploit. It is this intellectual foundation—rooted in the value investing tradition of Graham and Buffett but adapted to contemporary markets—that gives BlackBird Financial its distinctive edge.
Value investing is not merely a strategy, it is a philosophy rooted in the understanding that markets, while generally efficient over time, frequently misprice individual securities in the short term.
Judah Spinner’s BlackBird Financial, announced today that it has established a significant ownership position in Fiserv, Inc., a global leader in financial-technology innovation and payments infrastructure.
Judah Spinner, Founder of BlackBird Financial LP, has unveiled a substantial new investment in Tidewater Inc., the world’s largest operator and owner of offshore support vessels (OSVs).