Guy Spier
Minimalist, long-term, noise-free. Uses environment, checklists and habits to beat his own psychology, holding a handful of understandable compounders for the long run.
Oxford and Harvard MBA who founded the Aquamarine Fund in 1997, modeled on Buffett. He and Pabrai won the 2007 Buffett charity lunch; he later wrote the bestselling memoir The Education of a Value Investor. He moved the fund to Zurich to escape market noise.
Aquamarine files a 13F (≈45-day lag). Highly concentrated, very low turnover — Berkshire (A+B) alone is ≈half the book; a textbook case of words matching trades.
Holdings & weights
Q2 2026 · 13F (as of 30 Jun 2026)Weights are by market value, from real 13F / daily disclosure. This is a snapshot and will change — see live: Live 13F weights & activity on dataroma
With the A shares, ≈half the book — a direct expression of his Buffett conviction.
Analyze through a master's lensA core financial holding he shares with Buffett.
Analyze through a master's lensThe company Munger chaired for years — a nod to his hero.
Analyze through a master's lensWhere to follow them
Primary sources. Read the original — don't settle for second-hand summaries.
Run any stock you care about through the "Value · Circle of Competence" lens.
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