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
- +13.66%
- 3-year
- +68.33%
- 5-year
- +72.54%
- 3-year vs S&P 500
- +0.40%
- 5-year vs S&P 500
- +0.56%
- 5-year top 5
- +65.63%
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 2026-06-06 from SEC 13F data.
Live quotes available for 7 of 14 rows. Rows without a quote are marked unavailable.
| 1 | BRK-B | BERKSHIRE HATHAWAY INC DEL | 33.25% | Reduce -30.6% | 97,600 | $49.06M | $502.65 | |
| 2 | AXP | AMERICAN EXPRESS CO | 16.30% | Reduce -69.0% | 65,000 | $24.05M | $369.95 | |
| 3 | MA | MASTERCARD INCORPORATED | 15.48% | Reduce -39.2% | 40,000 | $22.84M | $570.88 | |
| 4 | BRK-A | BERKSHIRE HATHAWAY INC DEL | 15.35% | - | 30 | $22.64M | $754800.00 | |
| 5 | MCO | MOODYS CORP | 9.35% | - | 27,000 | $13.79M | $510.85 | |
| 6 | RACE | FERRARI N V | 6.48% | Reduce -50.0% | 30,000 | $9.56M | $318.70 | |
| 7 | DJCO | DAILY JOURNAL CORP | 3.80% | - | 11,500 | $5.6M | $487.30 | |
| 14 | SRG | SERITAGE GROWTH PPTYS | - | Sold | 0 | $0 | No quote | No quote |
| 13 | MU | MICRON TECHNOLOGY INC | - | Sold | 0 | $0 | No quote | No quote |
| 12 | CNR | CORE NATURAL RESOURCES INC | - | Sold | 0 | $0 | No quote | No quote |
| 11 | BAC | BANK AMERICA CORP | - | Sold | 0 | $0 | No quote | No quote |
| 10 | GOOGL | ALPHABET INC | - | Sold | 0 | $0 | No quote | No quote |
| 9 | AMR | ALPHA METALLURGICAL RESOUR I | - | Sold | 0 | $0 | No quote | No quote |
| 8 | BABA | ALIBABA GROUP HLDG LTD | - | Sold | 0 | $0 | No quote | No quote |