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 13 rows. Rows without a quote are marked unavailable.
| 1 | BRK-B | BERKSHIRE HATHAWAY INC DEL | 18.81% | - | 140,600 | $38.38M | $272.94 | |
| 2 | AXP | AMERICAN EXPRESS CO | 17.25% | - | 210,000 | $35.18M | $167.53 | |
| 3 | BAC | BK OF AMERICA CORP | 15.98% | - | 767,845 | $32.6M | $42.45 | |
| 4 | MA | MASTERCARD INC | 11.21% | - | 65,750 | $22.86M | $347.68 | |
| 5 | RACE | FERRARI N V | 8.22% | - | 80,000 | $16.76M | $209.54 | |
| 6 | MU | MICRON TECHNOLOGY INC | 6.96% | - | 200,000 | $14.2M | $70.98 | |
| 7 | BRK-A | BERKSHIRE HATHAWAY INC DEL | 6.05% | - | 30 | $12.34M | $411366.67 | |
| 8 | MCO | MOODYS CORP | 4.70% | - | 27,000 | $9.59M | $355.11 | |
| 9 | SRG | SERITAGE GROWTH PPTYS | 3.64% | - | 500,000 | $7.42M | No quote | No quote |
| 10 | BABA | ALIBABA GROUP HLDG LTD | 3.45% | - | 47,500 | $7.03M | $148.04 | |
| 11 | DJCO | DAILY JOURNAL CORP | 1.81% | - | 11,500 | $3.68M | $320.35 | |
| 12 | GOOGL | ALPHABET INC | 1.05% | - | 800 | $2.14M | $2673.75 | |
| 13 | TWTR | TWITTER INC | 0.89% | - | 30,000 | $1.81M | No quote | No quote |