Guy Spier: Concentrated Value Investing Remains Core Strategy
Wednesday, March 4, 2026 · Johnny Hopkins

Guy Spier’s Aquamarine Zurich AG reported an equity portfolio of approximately $148 million in the latest quarter, maintaining its hallmark concentrated, Buffett-inspired long-term investment approach. The portfolio is highly focused, with the top holdings representing virtually the entire portfolio, reflecting Spier’s preference for owning a small number of high-quality compounders held over long time horizons.
The latest filing shows meaningful trims in several core financial holdings and a full exit from a number of prior positions, suggesting portfolio simplification and further concentration into highest-conviction names.
Aquamarine continues to emphasize durable franchises, strong management, and businesses with long-term pricing power — consistent with Spier’s value investing philosophy.
Portfolio Snapshot
Total Portfolio Value: ~$147.5M
Top 10 Weight: 100% (extremely concentrated)
Turnover: Moderate — notable trims and multiple full exits
Top Holdings & Weights
| Company | Ticker | Value | Portfolio % |
|---|---|---|---|
| Berkshire Hathaway (Class B) | BRK.B | ~$49.1M | ~33.3% |
| American Express | AXP | ~$24.0M | ~16.3% |
| Mastercard | MA | ~$22.8M | ~15.5% |
| Berkshire Hathaway (Class A) | BRK.A | ~$22.6M | ~15.3% |
| Moody’s | MCO | ~$13.8M | ~9.4% |
| Ferrari | RACE | ~$9.6M | ~6.5% |
| Daily Journal Corp | DJCO | ~$5.6M | ~3.8% |
Key takeaway:
The portfolio heavily emphasizes:
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Berkshire Hathaway (combined exposure nearly 49%)
-
High-quality financial franchises (AXP, MA, MCO)
-
Select global luxury/brand assets (Ferrari)
-
A legacy value holding (Daily Journal)
This reflects Spier’s long-standing admiration for Buffett-style capital allocation and wide-moat businesses.
Biggest Changes Last Quarter
Notable Trims
American Express (AXP):
Shares reduced materially (~-69%)
→ Significant position reduction while remaining a core holding.
Mastercard (MA):
Trimmed (~-39%)
→ Suggests partial profit-taking or capital reallocation.
Berkshire Hathaway (BRK.B):
Reduced (~-31%)
→ Likely position management while maintaining Berkshire as the dominant exposure.
Ferrari (RACE):
Trimmed (~-50%)
→ Substantial reduction in luxury exposure.
Full Exits Last Quarter
Aquamarine exited several prior holdings entirely:
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Bank of America (BAC)
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Micron Technology (MU)
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Alibaba (BABA)
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Alphabet (GOOGL)
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Seritage Growth Properties (SRG)
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Alpha Metallurgical Resources (AMR)
-
Core Natural Resources (CNR)
These exits suggest continued portfolio simplification and a move away from cyclical, commodity-linked, and certain technology exposures in favor of ultra-high-conviction compounders.
Portfolio Characteristics
Style: Concentrated Quality Value
Concentration: Extremely high (top holdings dominate portfolio)
Turnover: Opportunistic trimming with decisive exits
Core Themes:
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Berkshire-centric exposure
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Financial services and payments networks
-
Rating agencies and durable franchises
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Select premium global brands
Geographic Exposure:
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Predominantly U.S.-listed companies
-
Limited but high-quality international exposure (Ferrari)
Summary
Guy Spier’s latest filing reinforces his disciplined, concentrated approach to investing. The portfolio remains heavily anchored in Berkshire Hathaway and a handful of high-quality financial franchises, reflecting a philosophy centered on long-term compounding rather than diversification.
The quarter saw meaningful trimming across several major holdings and the full exit of multiple smaller positions, indicating portfolio simplification and renewed focus on highest-conviction businesses.
Overall, Aquamarine’s structure continues to mirror Spier’s Buffett-inspired strategy: own exceptional businesses, maintain patience, and allow intrinsic value to compound over time.
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