GS
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Guy Spier13F | |
| Aquamarine Zurich AG | |
| Last update 2026-07-10 | 7 Stocks (0 new) |
| Value $144.00 Mil | Turnover 0 % |
Guy Spier Profile
Since founding New York-based Aquamarine Capital Management in 1997, Guy Spier has managed its privately offered investment funds. The firm manages $350 million in assets and has around 150 investors, which include family, friends and other third-party investors.
Earning an MBA from Harvard Business School in 1993, he previously worked as an investment banker in New York and as a management consultant in London and Paris. Spier also has a First Class degree in politics, philosophy and economics from Oxford University.
Spier, who lives in Zurich, Switzerland with his family, wrote “The Education of a Value Investor” in 2014.
Earning an MBA from Harvard Business School in 1993, he previously worked as an investment banker in New York and as a management consultant in London and Paris. Spier also has a First Class degree in politics, philosophy and economics from Oxford University.
Spier, who lives in Zurich, Switzerland with his family, wrote “The Education of a Value Investor” in 2014.
Guy Spier Investing Philosophy
Aquamarine’s investment philosophy was modeled on the original 1950s Buffett partnerships. A disciple of Warren Buffettt, Spier closely follows his principles on value investing and capital allocation.
Focusing primarily on global, long-term value, Spier makes all of the firm’s investment decisions. Any publicly traded security can be considered for investment.
Focusing primarily on global, long-term value, Spier makes all of the firm’s investment decisions. Any publicly traded security can be considered for investment.
Guy Spier Top Holdings of 2026-06-30
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| Ticker | | Company | Shares | Value ($1000) | Shares Change % | Weighting % | Trade Impact % | % of Shares outstanding | 3M Change % | YTD Change % | Market Cap $Mil | Industry |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BRK.B | Berkshire Hathaway Inc | 97,600 | 48,840.0 | 0% | 33.900 | 0% | 0.000 | +6.81% | -0.06% | 1,074,657.2 | Insurance | |
BRK.A | Berkshire Hathaway Inc | 30 | 22,470.0 | 0% | 15.590 | 0% | 0.000 | +6.66% | -0.36% | 1,074,657.2 | Insurance | |
AXP | American Express Co | 65,000 | 21,990.0 | 0% | 15.260 | 0% | 0.010 | +3.68% | -11.66% | 218,928.7 | Credit Services | |
MA | Mastercard Inc | 40,000 | 20,540.0 | 0% | 14.250 | 0% | 0.000 | +17.53% | +2.29% | 509,049.4 | Credit Services | |
MCO | Moodys Corp | 27,000 | 12,230.0 | 0% | 8.490 | 0% | 0.020 | +6.80% | -2.51% | 85,674.4 | Capital Markets | |
RACE | Ferrari NV | 30,000 | 11,110.0 | 0% | 7.710 | 0% | 0.020 | +17.46% | +12.27% | 74,426.4 | Vehicles & Parts | |
DJCO | Daily Journal Corp | 11,500 | 6,910.0 | 0% | 4.800 | 0% | 0.830 | +16.55% | +26.06% | 846.5 | Software |
Guy Spier's Historical Top Holdings Breakdowns
Guy Spier's Top Stock Picks
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| Ticker | | Company | Date | Action | Impact % | Price Range | Price | Price Change from Avrg% | Comment | Current Shares | Share Change |
|---|---|---|---|---|---|---|---|---|---|---|---|
AXP | American Express Co | 2025-12-31 | Reduce Reduce | -15.18% | 316.26 ($358.32) 384.89 | $324.19 | -9.53% | Reduce -69.05% | 65,000 | -145,000 | |
BAC | Bank of America Corp | 2025-12-31 | Sold Out Sold Out | -12.48% | 48.65 ($52.89) 56.25 | $61.99 | 17.21% | Sold Out | 0 | -767,845 | |
BRK.B | Berkshire Hathaway Inc | 2025-12-31 | Reduce Reduce | -6.81% | 475.68 ($497.52) 513.81 | $502.33 | 0.97% | Reduce -30.58% | 97,600 | -43,000 | |
MA | Mastercard Inc | 2025-12-31 | Reduce Reduce | -4.61% | 527.58 ($558.79) 580.45 | $581.10 | 3.99% | Reduce -39.16% | 40,000 | -25,750 | |
RACE | Ferrari NV | 2025-12-31 | Reduce Reduce | -4.57% | 364.04 ($398.72) 504.09 | $410.21 | 2.88% | Reduce -50% | 30,000 | -30,000 | |
MU | Micron Technology Inc | 2025-12-31 | Sold Out Sold Out | -4.22% | 181.6 ($230.2) 294.37 | $933.44 | 305.49% | Sold Out | 0 | -80,000 | |
BABA | Alibaba Group Holding Ltd | 2025-12-31 | Sold Out Sold Out | -2.67% | 146.58 ($162.54) 189.34 | $112.85 | -30.57% | Sold Out | 0 | -47,500 | |
GOOGL | Alphabet Inc | 2025-12-31 | Sold Out Sold Out | -1.23% | 236.57 ($286.38) 323.44 | $335.02 | 16.98% | Sold Out | 0 | -16,000 | |
SRG | Seritage Growth Properties | 2025-12-31 | Sold Out Sold Out | -0.67% | 3.25 ($3.79) 4.3 | $2.02 | -46.70% | Sold Out | 0 | -500,000 | |
AMR | Alpha Metallurgical Resources Inc | 2025-12-31 | Sold Out Sold Out | -0.41% | 153.02 ($172.82) 208.74 | $233.41 | 35.06% | Sold Out | 0 | -8,000 |
Guy Spier Total Holding History ($B)
Guy Spier's Asset Allocation
Guy Spier Past Portfolios
| Portfolio Date | Number of Stocks | New Stocks | Total Value ($Mil) | Q/Q Turnover |
|---|---|---|---|---|
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Guy Spier's Hypothetical Growth since 2026-06-30
Guy Spier's Yearly Returns
This information is only displayed for Gurus who publicly disclose audited performance records; most hedge funds and private investment firms do not publish such data or only provide limited historical performance information.
| Year | Portfolio % | % | Excess Gain % |
|---|
Guy Spier's Holdings Heat Map
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Guy Spier's Holdings Bubble Chart
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