Featured 13F manager
Aquamarine Zurich AG Guy Spier
- $144M
- 7 Positions
- 2026 Q2
- +6.7% QoQ
- Top 5 87.5%
Portfolio
top 5 87.5% · top 10 100.0%
- BRK.B - Berkshire Hathaway · CL B 33.9%
- BRK.A - Berkshire Hathaway · CL A 15.6%
- AXP - American Express 15.3%
- MA - Mastercard · CL A 14.2%
- MCO - Moodys 8.5%
- RACE - Ferrari 7.7%
- DJCO - Daily Journal 4.8%
AUM over time
Book
| BRK.B - Berkshire Hathaway · CL B | 33.25% | Reduce −30.6% | 97,600 | $502.65 | $49M | −43,000 | −$22M |
| AXP - American Express | 16.30% | Reduce −69.0% | 65,000 | $369.95 | $24M | −145,000 | −$46M |
| MA - Mastercard · CL A | 15.48% | Reduce −39.2% | 40,000 | $570.88 | $23M | −25,750 | −$15M |
| BRK.A - Berkshire Hathaway · CL A | 15.35% | Hold | 30 | $754,800 | $23M | — | — |
| MCO - Moodys | 9.35% | Hold | 27,000 | $510.85 | $14M | — | — |
| RACE - Ferrari | 6.48% | Reduce −50.0% | 30,000 | $318.70 | $10M | −30,000 | −$19M |
| DJCO - Daily Journal | 3.80% | Hold | 11,500 | $487.30 | $6M | — | — |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2025 Q3
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| BAC - Bank of America | 12.48% | Exit | 0 | $51.59 | $40M | −767,845 | −$40M |
| MU - Micron Technology | 4.22% | Exit | 0 | $167.32 | $13M | −80,000 | −$13M |
| BABA - Alibaba Group | 2.68% | Exit | 0 | $178.74 | $8M | −47,500 | −$8M |
| GOOGL - Alphabet · CL A | 1.23% | Exit | 0 | $243.12 | $4M | −16,000 | −$4M |
| SRG - Seritage Growth Pptys · CL A | 0.67% | Exit | 0 | $4.25 | $2M | −500,000 | −$2M |
| AMR - Alpha Metallurgical | 0.41% | Exit | 0 | $164.12 | $1M | −8,000 | −$1M |
| CNR - Core Natural Resources | 0.28% | Exit | 0 | $83.52 | $897K | −10,740 | −$897K |
Filings history
20 periods · normalized AUM · open a period for holdings
| Period | Holdings | AUM | QoQ | Form | Filed | Filing ID |
|---|---|---|---|---|---|---|
| 2026 Q2 | 7 | $144M | +6.7% | 13F-HR | 7/10/2026 | 000195332426000003 |
| 2026 Q1 | 7 | $135M | −8.8% | 13F-HR | 4/17/2026 | 000195332426000002 |
| 2025 Q4 | 7 | $148M | −53.3% | 13F-HR | 1/15/2026 | 000195332426000001 |
| 2025 Q3 | 14 | $317M | +2.3% | 13F-HR | 10/20/2025 | 000195332425000007 |
| 2025 Q2 | 14 | $310M | — | RESTATEMENT | 7/18/2025 | 000195332425000006 |
| 2025 Q2 | 14 | $310M | +5.4% | 13F-HR | 7/16/2025 | 000195332425000004 |
| 2025 Q1 | 14 | $294M | — | RESTATEMENT | 7/18/2025 | 000195332425000005 |
| 2025 Q1 | 14 | $294M | +2.1% | 13F-HR | 4/11/2025 | 000195332425000003 |
| 2024 Q4 | 14 | $288M | +0.7% | 13F-HR | 1/24/2025 | 000195332425000001 |
| 2024 Q3 | 14 | $286M | +8.7% | 13F-HR | 10/16/2024 | 000195332424000005 |
| 2024 Q2 | 14 | $263M | +0.4% | 13F-HR | 7/11/2024 | 000195332424000004 |
| 2024 Q1 | 12 | $262M | +14.4% | 13F-HR | 4/18/2024 | 000195332424000003 |
| 2023 Q4 | 12 | $229M | +12.8% | 13F-HR | 2/1/2024 | 000195332424000002 |
| 2023 Q3 | 12 | $203M | −3.3% | 13F-HR | 10/12/2023 | 000195332423000004 |
| 2023 Q2 | 12 | $210M | +8.8% | 13F-HR | 7/13/2023 | 000195332423000003 |
| 2023 Q1 | 12 | $193M | +3.8% | 13F-HR | 4/18/2023 | 000195332423000002 |
| 2022 Q4 | 12 | $186M | +13.4% | 13F-HR | 1/27/2023 | 000195332423000001 |
| 2022 Q3 | 12 | $164M | entity change | 13F-HR | 11/8/2022 | 000195332422000001 |
| 2022 Q2 | 12 | $170M | −23.1% | 13F-HR | 8/2/2022 | 000140459922000005 |
| 2022 Q1 | 13 | $221M | +1.4% | 13F-HR | 5/12/2022 | 000140459922000002 |
| 2021 Q4 | 13 | $218M | +6.9% | 13F-HR | 2/7/2022 | 000140459922000001 |
| 2021 Q3 | 13 | $204M | — | 13F-HR | 10/28/2021 | 000140459921000006 |
About
Aquamarine Zurich AG
22 processed 13Fs on this site · 2021 Q3–2026 Q2