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 12 rows. Rows without a quote are marked unavailable.
| 1 | BRK-B | BERKSHIRE HATHAWAY INC DEL | 23.37% | - | 140,600 | $43.43M | $308.90 | |
| 2 | AXP | AMERICAN EXPRESS CO | 16.69% | - | 210,000 | $31.03M | $147.75 | |
| 3 | BAC | BK OF AMERICA CORP | 13.68% | - | 767,845 | $25.43M | $33.12 | |
| 4 | MA | MASTERCARD INCORPORATED | 12.30% | - | 65,750 | $22.86M | $347.73 | |
| 5 | RACE | FERRARI N V | 9.22% | - | 80,000 | $17.15M | $214.31 | |
| 6 | BRK-A | BERKSHIRE HATHAWAY INC DEL | 7.57% | - | 30 | $14.06M | $468700.00 | |
| 7 | MU | MICRON TECHNOLOGY INC | 5.38% | - | 200,000 | $10M | $49.98 | |
| 8 | MCO | MOODYS CORP | 4.05% | - | 27,000 | $7.52M | $278.63 | |
| 9 | SRG | SERITAGE GROWTH PPTYS | 3.18% | - | 500,000 | $5.92M | No quote | No quote |
| 10 | BABA | ALIBABA GROUP HLDG LTD | 2.25% | - | 47,500 | $4.18M | $88.08 | |
| 11 | DJCO | DAILY JOURNAL CORP | 1.55% | - | 11,500 | $2.88M | $250.52 | |
| 12 | GOOGL | ALPHABET INC | 0.76% | Add +1900.0% | 16,000 | $1.41M | $88.25 |