Guy Spier - Aquamarine Capital
As of Q2 2026, Guy Spier reported 7 long-equity positions worth $144.09M in aggregate.
Copy-investor backtest
- Latest quarter
- +3.96%
- 1-year
- +2.66%
- 3-year
- +75.51%
- 5-year
- +66.51%
- 3-year vs S&P 500
- +1.42%
- 5-year vs S&P 500
- +1.79%
- 5-year top 5
- +55.17%
Return from mechanically copying the disclosed 13F equity portfolio after each filing and rebalancing at the next. The vs S&P 500 figures subtract SPY over that manager's own rebalance dates, so both sides cover the same days; both are price return, excluding dividends. Method & limitations.
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Updated 2026-09-19 from SEC 13F data.
Live quotes available for 11 of 14 rows. Rows without a quote are marked unavailable.
| 1 | BRK-B | BERKSHIRE HATHAWAY INC DEL | 18.33% | - | 140,600 | $39.08M | $277.92 | |
| 2 | AXP | AMERICAN EXPRESS CO | 16.28% | - | 210,000 | $34.7M | $165.23 | |
| 3 | BAC | BK OF AMERICA CORP | 14.85% | - | 767,845 | $31.66M | $41.23 | |
| 4 | MA | MASTERCARD INC | 11.26% | - | 65,750 | $24.01M | $365.10 | |
| 5 | MU | MICRON TECHNOLOGY INC | 7.97% | - | 200,000 | $17M | $84.98 | |
| 6 | RACE | FERRARI N V | 7.74% | - | 80,000 | $16.51M | $206.32 | |
| 7 | BRK-A | BERKSHIRE HATHAWAY INC DEL | 5.89% | - | 30 | $12.56M | $418600.00 | |
| 8 | BABA | ALIBABA GROUP HLDG LTD | 5.05% | New | 47,500 | $10.77M | $226.78 | |
| 9 | MCO | MOODYS CORP | 4.59% | - | 27,000 | $9.78M | $362.37 | |
| 10 | SRG | SERITAGE GROWTH PPTYS | 4.32% | - | 500,000 | $9.2M | No quote | No quote |
| 11 | DJCO | DAILY JOURNAL CORP | 1.83% | New | 11,500 | $3.89M | $338.52 | |
| 12 | TWTR | TWITTER INC | 0.97% | - | 30,000 | $2.06M | No quote | No quote |
| 13 | GOOGL | ALPHABET INC | 0.92% | - | 800 | $1.95M | $2441.25 | |
| 14 | WFC | WELLS FARGO CO NEW | - | Sold | 0 | $0 | No quote | No quote |