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 13 rows. Rows without a quote are marked unavailable.
| 1 | BRK-B | BERKSHIRE HATHAWAY INC DEL | 19.32% | - | 140,600 | $42.04M | $299.00 | |
| 2 | AXP | AMERICAN EXPRESS CO | 15.79% | - | 210,000 | $34.36M | $163.60 | |
| 3 | BAC | BK OF AMERICA CORP | 15.70% | - | 767,845 | $34.16M | $44.49 | |
| 4 | MA | MASTERCARD INC | 10.86% | - | 65,750 | $23.63M | $359.32 | |
| 5 | RACE | FERRARI N V | 9.51% | - | 80,000 | $20.69M | $258.66 | |
| 6 | MU | MICRON TECHNOLOGY INC | 8.56% | - | 200,000 | $18.63M | $93.15 | |
| 7 | BRK-A | BERKSHIRE HATHAWAY INC DEL | 6.21% | - | 30 | $13.52M | $450666.67 | |
| 8 | MCO | MOODYS CORP | 4.85% | - | 27,000 | $10.55M | $390.59 | |
| 9 | SRG | SERITAGE GROWTH PPTYS | 3.05% | - | 500,000 | $6.64M | No quote | No quote |
| 10 | BABA | ALIBABA GROUP HLDG LTD | 2.59% | - | 47,500 | $5.64M | $118.80 | |
| 11 | DJCO | DAILY JOURNAL CORP | 1.89% | - | 11,500 | $4.1M | $356.70 | |
| 12 | GOOGL | ALPHABET INC | 1.07% | - | 800 | $2.32M | $2897.50 | |
| 13 | TWTR | TWITTER INC | 0.60% | - | 30,000 | $1.3M | No quote | No quote |