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 14 rows. Rows without a quote are marked unavailable.
| 1 | BRK-B | BERKSHIRE HATHAWAY INC DEL | 22.04% | - | 140,600 | $68.3M | $485.77 | |
| 2 | AXP | AMERICAN EXPRESS CO | 21.62% | - | 210,000 | $66.99M | $318.98 | |
| 3 | MA | MASTERCARD INCORPORATED | 11.92% | - | 65,750 | $36.95M | $561.95 | |
| 4 | BAC | BANK AMERICA CORP | 11.73% | - | 767,845 | $36.33M | $47.32 | |
| 5 | RACE | FERRARI N V | 8.06% | - | 60,000 | $24.97M | $416.10 | |
| 6 | MU | MICRON TECHNOLOGY INC | 7.96% | - | 200,000 | $24.65M | $123.25 | |
| 7 | BRK-A | BERKSHIRE HATHAWAY INC DEL | 7.06% | - | 30 | $21.86M | $728800.00 | |
| 8 | MCO | MOODYS CORP | 4.37% | - | 27,000 | $13.54M | $501.59 | |
| 9 | BABA | ALIBABA GROUP HLDG LTD | 1.74% | - | 47,500 | $5.39M | $113.41 | |
| 10 | DJCO | DAILY JOURNAL CORP | 1.57% | - | 11,500 | $4.86M | $422.26 | |
| 11 | GOOGL | ALPHABET INC | 0.91% | - | 16,000 | $2.82M | $176.25 | |
| 12 | SRG | SERITAGE GROWTH PPTYS | 0.50% | - | 500,000 | $1.54M | No quote | No quote |
| 13 | AMR | ALPHA METALLURGICAL RESOUR I | 0.29% | - | 8,000 | $900K | $112.50 | |
| 14 | CNR | CORE NATURAL RESOURCES INC | 0.24% | - | 10,740 | $749K | $69.74 |