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 10 of 13 rows. Rows without a quote are marked unavailable.
| 1 | BRK-B | BERKSHIRE HATHAWAY INC DEL | 18.28% | - | 140,600 | $25.1M | $178.51 | |
| 2 | AXP | AMERICAN EXPRESS CO | 14.56% | - | 210,000 | $19.99M | $95.20 | |
| 3 | MA | MASTERCARD INC | 14.16% | - | 65,750 | $19.44M | $295.70 | |
| 4 | BAC | BK OF AMERICA CORP | 13.28% | - | 767,845 | $18.24M | $23.75 | |
| 5 | RACE | FERRARI N V | 9.94% | Reduce -60.0% | 80,000 | $13.65M | $170.59 | |
| 6 | BRK-A | BERKSHIRE HATHAWAY INC DEL | 5.84% | - | 30 | $8.02M | $267300.00 | |
| 7 | FCAU | FIAT CHRYSLER AUTOMOBILES N | 5.56% | Reduce -57.8% | 760,000 | $7.64M | No quote | No quote |
| 8 | MCO | MOODYS CORP | 5.40% | Add +8.0% | 27,000 | $7.42M | $274.74 | |
| 9 | MU | MICRON TECHNOLOGY INC | 4.50% | - | 120,000 | $6.18M | $51.52 | |
| 10 | SRG | SERITAGE GROWTH PPTYS | 4.15% | Add +25.0% | 500,000 | $5.7M | No quote | No quote |
| 11 | WFC | WELLS FARGO CO NEW | 2.83% | - | 151,741 | $3.89M | $25.60 | |
| 12 | GOOGL | ALPHABET INC | 0.83% | New | 800 | $1.13M | $1417.50 | |
| 13 | TWTR | TWITTER INC | 0.65% | New | 30,000 | $894K | No quote | No quote |