Guy Spier - Aquamarine Capital Investment Strategy & Portfolio Analysis

As of Mar 31, 2026, Guy Spier's Aquamarine Capital portfolio reflects a highly concentrated, high-conviction, thematic approach across 12 reported 13F positions. Portfolio returns are primarily driven by a small set of mega-cap compounders, with the top five holdings accounting for approximately 75% of total exposure and Berkshire Hathaway Inc. New alone contributing ~23%. While the portfolio includes 12 positions, economic outcomes are highly concentrated in a narrow set of large-cap financial names, indicating a meaningful divergence between structural diversification and return concentration. Exposure to high-growth and technology-oriented segments remains limited relative to peers, with performance instead anchored in durable, cash-generating businesses across financials and unknown. The portfolio exhibits extremely low turnover, reinforcing a long-term capital allocation approach centered on high-conviction, long-duration holdings. Distinctive traits include Long-Term Holder, Moderately Concentrated, Economically Concentrated.