Guy Spier - Aquamarine Capital Management
34 trades
· 27 closed
· 7 open
· Win rate: 52.9%
· Avg return: +93.4%
· Median return: +12.3%
⚠ 1 of these positions have a value-scale error in the underlying SEC filing
(an entry or exit price ≥25× off the rest of the holding), so their return is unreliable. They are marked
data error below and excluded from the stats above, but their
quarter-by-quarter filing history is still attached — open History on any row to see it exactly as filed.
| Stock | Entry Quarter |
Entry Price |
Exit Quarter |
Exit / Current Price |
Return | Status | Filings |
|---|---|---|---|---|---|---|---|
| Q1 2016 | $41.53 | Open | $369.16 | +788.90% | Open | History | |
| Q4 2014 | $86.16 | Open | $538.02 | +524.44% | Open | History | |
| Q1 2016 | $96.56 | Open | $494.73 | +412.36% | Open | History | |
| Q4 2016 | $74.08 | Open | $355.06 | +379.29% | Open | History | |
| Q3 2019 | $42.85 | Q3 2025 | $167.32 | +290.48% | Closed | History | |
| Q2 2020 | $70.88 | Q3 2025 | $243.13 | +243.04% | Closed | History | |
| Q4 2016 | $244,133.33 | Open | $737,000.00 | +201.88% | Open | History | |
| Q4 2016 | $162.98 | Open | $491.09 | +201.32% | Open | History | |
| Q4 2016 | $22.10 | Q3 2025 | $51.59 | +133.44% | Closed | History | |
| Q2 2021 | $338.52 | Open | $570.68 | +68.58% | Open | History | |
| Q4 2014 | $7.64 | Q3 2020 | $12.27 | +60.64% | Closed | History | |
| Q1 2016 | $11.13 | Q3 2017 | $16.69 | +49.96% | Closed | History | |
| Q4 2014 | $10.93 | Q4 2018 | $15.69 | +43.55% | Closed | History | |
| Q2 2020 | $29.80 | Q1 2022 | $38.70 | +29.87% | Closed | History | |
| Q4 2016 | $9.95 | Q4 2018 | $12.84 | +29.05% | Closed | History | |
| Q4 2014 | $54.11 | Q2 2018 | $66.92 | +23.67% | Closed | History | |
| Q4 2014 | $63.81 | Q2 2018 | $74.16 | +16.22% | Closed | History | |
| Q1 2025 | $77.09 | Q3 2025 | $83.52 | +8.34% | Closed | History | |
| Q4 2014 | $93.04 | Q4 2014 | $93.04 | +0.00% | Closed | History | |
| Q4 2014 | $17.89 | Q4 2014 | $17.89 | +0.00% | Closed | History | |
| Q4 2014 | $7.00 | Q4 2014 | $7.00 | +0.00% | Closed | History | |
| Q4 2014 | $226,000.00 | Q4 2014 | $226,000.00 | +0.00% | Closed | History | |
| Q4 2014 | $150.15 | Q4 2014 | $150.15 | +0.00% | Closed | History | |
| Q4 2014 | $86.70 | Q4 2014 | $86.70 | +0.00% | Closed | History | |
| Q4 2014 | $193.82 | Q4 2014 | $193.82 | +0.00% | Closed | History | |
| Q2 2017 | $12.00 | Q4 2018 | $11.22 | -6.50% | Closed | History | |
| Q2 2024 | $152.22 | Q4 2024 | $141.23 | -7.22% | Closed | History | |
| Q4 2014 | $21.30 | Q3 2018 | $19.27 | -9.53% | Closed | History | |
| Q2 2021 | $226.78 | Q3 2025 | $178.74 | -21.18% | Closed | History | |
| Q4 2014 | $54.82 | Q1 2021 | $39.07 | -28.73% | Closed | History | |
| Q4 2017 | $2.36 | Q4 2019 | $1.54 | -34.75% | Closed | History | |
| Q2 2024 | $280.50 | Q3 2025 | $164.13 | -41.49% | Closed | History | |
| Q4 2014 | $15.83 | Q4 2015 | $2.05 | -87.05% | Closed | History | |
| Q1 2016 | $49.97 | Q3 2025 | $4.25 | -91.49% | Closed | History | |
| Q4 2014 | $0.01 | Q1 2015 | $0.02 | data error | Closed | History |
Entry/exit prices and returns are split-adjusted to today's share basis.
The quarter-by-quarter history shows prices exactly as filed with the SEC, so a pre-split
quarter's price will look higher than the split-adjusted entry above.