Guy Spier - Aquamarine Capital Management
| History | Stock | Activity ▼ | Share change | % change to portfolio |
|---|---|---|---|---|
| Q4 2025 | ||||
| ☰ | BRK.B - Berkshire Hathaway CL B | Reduce 30.58% | 43,000 | 6.81 |
| ☰ | MA - Mastercard Inc. | Reduce 39.16% | 25,750 | 4.62 |
| ☰ | RACE - Ferrari N.V. | Reduce 50.00% | 30,000 | 4.57 |
| ☰ | AXP - American Express Co. | Reduce 69.05% | 145,000 | 15.18 |
| ☰ | BAC - Bank of America Corp. | Sell 100.00% | 767,845 | 12.48 |
| ☰ | MU - Micron Technology, Inc. | Sell 100.00% | 80,000 | 4.22 |
| ☰ | BABA - Alibaba Group Holdings Ltd. | Sell 100.00% | 47,500 | 2.68 |
| ☰ | GOOGL - Alphabet Inc. | Sell 100.00% | 16,000 | 1.23 |
| ☰ | SRG - Seritage Growth Properties | Sell 100.00% | 500,000 | 0.67 |
| ☰ | AMR - Alpha Metallurgical Resources, Inc. | Sell 100.00% | 8,000 | 0.41 |
| ☰ | CNR - Core Natural Resources, Inc. | Sell 100.00% | 10,740 | 0.28 |
| Q3 2025 | ||||
| ☰ | MU - Micron Technology, Inc. | Reduce 60.00% | 120,000 | 4.77 |
| Q1 2025 | ||||
| ☰ | CNR - Core Natural Resources, Inc. | Buy | 10,740 | 0.28 |
| ☰ | ARCH - Arch Resources Inc | Sell 100.00% | 8,100 | 0.40 |
| Q2 2024 | ||||
| ☰ | AMR - Alpha Metallurgical Resources, Inc. | Buy | 8,000 | 0.85 |
| ☰ | ARCH - Arch Resources Inc | Buy | 8,100 | 0.47 |
| Q1 2024 | ||||
| ☰ | RACE - Ferrari N.V. | Reduce 25.00% | 20,000 | 2.95 |
| Q4 2022 | ||||
| ☰ | GOOGL - Alphabet Inc. | Add 1900.00% | 15,200 | 0.72 |
| Q2 2022 | ||||
| ☰ | TWTR - Twitter Inc | Sell 100.00% | 30,000 | 0.53 |
| Q2 2021 | ||||
| ☰ | BABA - Alibaba Group Holdings Ltd. | Buy | 47,500 | 5.05 |
| ☰ | DJCO - Daily Journal Corp. | Buy | 11,500 | 1.83 |
| ☰ | WFC - Wells Fargo & Co. | Sell 100.00% | 151,741 | 3.10 |
| Q4 2020 | ||||
| ☰ | MU - Micron Technology, Inc. | Add 66.67% | 80,000 | 3.51 |
| ☰ | STLA - Stellantis N.V. | Sell 100.00% | 760,000 | 6.15 |
| Q2 2020 | ||||
| ☰ | SRG - Seritage Growth Properties | Add 25.00% | 100,000 | 0.83 |
| ☰ | MCO - Moody's Corp. | Add 8.00% | 2,000 | 0.40 |
| ☰ | GOOGL - Alphabet Inc. | Buy | 16,000 | 0.83 |
| ☰ | TWTR - Twitter Inc | Buy | 30,000 | 0.65 |
| ☰ | STLA - Stellantis N.V. | Reduce 57.78% | 1,040,000 | 5.14 |
| ☰ | RACE - Ferrari N.V. | Reduce 60.00% | 120,000 | 12.78 |
| Q1 2020 | ||||
| ☰ | AXP - American Express Co. | Reduce 5.59% | 12,430 | 0.71 |
| ☰ | STLA - Stellantis N.V. | Reduce 10.00% | 200,000 | 1.36 |
| ☰ | TOO - Teekay Offshore Partners L P | Sell 100.00% | 1,000,000 | 0.71 |
| Q3 2019 | ||||
| ☰ | SRG - Seritage Growth Properties | Add 33.33% | 100,000 | 2.15 |
| ☰ | MU - Micron Technology, Inc. | Buy | 120,000 | 2.60 |
| Q1 2019 | ||||
| ☰ | BAC - Bank of America Corp. | Add 30.14% | 177,845 | 2.71 |
| ☰ | SRG - Seritage Growth Properties | Add 13.69% | 36,131 | 0.89 |
| ☰ | GM.WS.B - General Mtrs Co | Sell 100.00% | 1,000,000 | 8.83 |
| ☰ | BAC.WS.A - Bank Amer Corp | Sell 100.00% | 320,000 | 2.31 |
| ☰ | TERP - Terraform Pwr Inc | Sell 100.00% | 231,183 | 1.46 |
| Q4 2018 | ||||
| ☰ | WFC - Wells Fargo & Co. | Add 31.95% | 36,741 | 0.95 |
| ☰ | SRG - Seritage Growth Properties | Add 23.38% | 50,000 | 0.91 |
| ☰ | WFC.WS - Wells Fargo Co New | Sell 100.00% | 110,000 | 1.02 |
| Q3 2018 | ||||
| ☰ | SRG - Seritage Growth Properties | Add 221.09% | 147,262 | 3.37 |
| ☰ | AXP - American Express Co. | Reduce 18.35% | 50,000 | 2.31 |
| ☰ | C - Citigroup Inc. | Sell 100.00% | 106,000 | 3.34 |
| ☰ | PKX - Posco | Sell 100.00% | 1,281 | 0.04 |
| Q2 2018 | ||||
| ☰ | SRG - Seritage Growth Properties | Add 51.83% | 22,738 | 0.45 |
| ☰ | PKX - Posco | Reduce 93.60% | 18,719 | 0.71 |
| Q1 2018 | ||||
| ☰ | PKX - Posco | Reduce 55.56% | 25,000 | 0.93 |
| Q4 2017 | ||||
| ☰ | TERP - Terraform Pwr Inc | Add 10.38% | 21,748 | 0.12 |
| ☰ | TOO - Teekay Offshore Partners L P | Buy | 1,000,000 | 1.13 |
| ☰ | PKX - Posco | Reduce 35.71% | 25,000 | 0.88 |
| ☰ | 0E41 - Enlink Midstream LLC | Sell 100.00% | 719 | 0.01 |
| Q2 2017 | ||||
| ☰ | TERP - Terraform Pwr Inc | Buy | 209,435 | 1.53 |
| ☰ | SRG - Seritage Growth Properties | Reduce 75.63% | 136,131 | 3.62 |
| Q4 2016 | ||||
| ☰ | BRK.B - Berkshire Hathaway CL B | Buy | 140,600 | 15.36 |
| ☰ | AXP - American Express Co. | Buy | 272,430 | 13.53 |
| ☰ | BAC - Bank of America Corp. | Buy | 590,000 | 8.74 |
| ☰ | BRK.A - Berkshire Hathaway CL A | Buy | 30 | 4.91 |
| ☰ | BAC.WS.A - Bank Amer Corp | Buy | 320,000 | 2.13 |
| Q3 2016 | ||||
| ☰ | SRG - Seritage Growth Properties | Add 80.00% | 80,000 | 5.75 |
| Q2 2016 | ||||
| ☰ | SRG - Seritage Growth Properties | Add 33.33% | 25,000 | 2.13 |
| Q1 2016 | ||||
| ☰ | RACE - Ferrari N.V. | Buy | 200,000 | 12.68 |
| ☰ | SRG - Seritage Growth Properties | Buy | 75,000 | 5.72 |
| ☰ | MCO - Moody's Corp. | Buy | 25,000 | 3.68 |
| ☰ | 0E41 - Enlink Midstream LLC | Buy | 719 | 0.01 |
| ☰ | ZINCQ - Horsehead Holding Corp | Sell 100.00% | 1,320,000 | 3.87 |
| Q2 2015 | ||||
| ☰ | CRESW - Cresud SA Comercial | Sell 100.00% | 271,944 | 0.01 |
| Q1 2015 | ||||
| ☰ | GM.WS.B - General Motors Co | Add 42.86% | 300,000 | 6.38 |
| ☰ | ZINCQ - Horsehead Holding Corp | Add 8.20% | 100,000 | 1.37 |
| ☰ | AXP - American Express Co. | Sell 100.00% | 272,430 | 16.79 |
| ☰ | BRK.B - Berkshire Hathaway CL B | Sell 100.00% | 140,600 | 13.98 |
| ☰ | BAC - Bank of America Corp. | Sell 100.00% | 590,000 | 6.99 |
| ☰ | BRK.A - Berkshire Hathaway CL A | Sell 100.00% | 30 | 4.49 |
| ☰ | GS - The Goldman Sachs Group, Inc. | Sell 100.00% | 30,502 | 3.92 |
| ☰ | DIG1 - Directv | Sell 100.00% | 50,000 | 2.87 |
| ☰ | BAC.WS.A - Bank Of America Corp | Sell 100.00% | 320,000 | 1.48 |