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 2026-09-12 from SEC 13F data.
Live quotes available for 13 of 15 rows. Rows without a quote are marked unavailable.
| 1 | BRK-B | BERKSHIRE HATHAWAY INC DEL | 25.50% | - | 140,600 | $74.88M | $532.58 | |
| 2 | AXP | AMERICAN EXPRESS CO | 19.24% | - | 210,000 | $56.5M | $269.05 | |
| 3 | MA | MASTERCARD INCORPORATED | 12.27% | - | 65,750 | $36.04M | $548.12 | |
| 4 | BAC | BANK AMERICA CORP | 10.91% | - | 767,845 | $32.04M | $41.73 | |
| 5 | BRK-A | BERKSHIRE HATHAWAY INC DEL | 8.16% | - | 30 | $23.95M | $798433.33 | |
| 6 | RACE | FERRARI N V | 8.01% | - | 60,000 | $23.53M | $392.20 | |
| 7 | MU | MICRON TECHNOLOGY INC | 5.92% | - | 200,000 | $17.38M | $86.89 | |
| 8 | MCO | MOODYS CORP | 4.28% | - | 27,000 | $12.57M | $465.70 | |
| 9 | BABA | ALIBABA GROUP HLDG LTD | 2.14% | - | 47,500 | $6.28M | $132.23 | |
| 10 | DJCO | DAILY JOURNAL CORP | 1.56% | - | 11,500 | $4.57M | $397.74 | |
| 11 | GOOGL | ALPHABET INC | 0.84% | - | 16,000 | $2.47M | $154.63 | |
| 12 | SRG | SERITAGE GROWTH PPTYS | 0.55% | - | 500,000 | $1.62M | No quote | No quote |
| 13 | AMR | ALPHA METALLURGICAL RESOUR I | 0.34% | - | 8,000 | $1M | $125.25 | |
| 14 | CNR | CORE NATURAL RESOURCES INC | 0.28% | New | 10,740 | $828K | $77.09 | |
| 15 | ARCH | ARCH RESOURCES INC | - | Sold | 0 | $0 | No quote | No quote |