Aquamarine Capital
13F Holdings and Portfolio Analysis
Guy Spier 2025 Q2 13F holdings, quarterly changes, portfolio value trend and position weight distribution.
Aquamarine Capital Overview
Aquamarine Capital held 14 stocks in 2025 Q2, with total market value around $0.31B.
Aquamarine Capital's top five holdings in 2025 Q2: BERKSHIRE HATHAWAY INC DEL CL B NEW(BRK.B) 22.04%, American Express Company(AXP) 21.62%, Mastercard Incorporated(MA) 11.92%, Bank of America Corporation(BAC) 11.73%, FERRARI N V COM(RACE) 8.06%.
- Portfolio Value
- $0.31B
- Current Holdings
- 14 stocks
- New / Increased
- 0 / 0
- Reduced / Exited
- 0 / 0
Current Holdings
| 1 | BERKSHIRE HATHAWAY INC DEL CL B NEWBRK.B | 0.07 | 22.04% | 0.14 - | $485.77 | $470.25 -3.19% | $162.98 | 0.00 | 6.25 | +$0.04B+188.53% | Held |
| 2 | American Express CompanyAXP | 0.07 | 21.62% | 0.21 - | $318.98 | $345.73 +8.38% | $74.08 | 0.00 | 6.25 | +$0.06B+366.68% | Held |
| 3 | Mastercard IncorporatedMA | 0.04 | 11.92% | 0.07 - | $561.95 | $490.28 -12.75% | $86.16 | 0.00 | 8.25 | +$0.03B+469.04% | Held |
| 4 | Bank of America CorporationBAC | 0.04 | 11.73% | 0.77 - | $47.32 | $51.42 +8.68% | $23.37 | 0.00 | 6.25 | +$0.02B+120.03% | Held |
| 5 | FERRARI N V COMRACE | 0.02 | 8.06% | 0.06 - | $416.10 | - | $41.53 | 0.00 | 7.00 | +$0.02B+901.81% | Held |
| 6 | Micron Technology, Inc.MU | 0.02 | 7.96% | 0.20 - | $123.25 | $971.00 +687.83% | $55.78 | 0.00 | 3.50 | +$0.18B+1640.70% | Held |
| 7 | BERKSHIRE HATHAWAY INC CL ABRK.A | 0.02 | 7.06% | 0.00 - | $728800.00 | $705400.23 -3.21% | $244133.33 | 0.00 | 6.25 | +$0.01B+188.94% | Held |
| 8 | Moody's CorporationMCO | 0.01 | 4.37% | 0.03 - | $501.59 | $459.29 -8.43% | $109.76 | 0.00 | 7.00 | +$0.01B+318.45% | Held |
| 9 | Alibaba Group Holding LimitedBABA | 0.01 | 1.74% | 0.05 - | $113.41 | $125.39 +10.56% | $226.78 | 0.00 | 1.75 | -$0.00B-44.71% | Held |
| 10 | DAILY JOURNAL CORPDJCO | 0.00 | 1.57% | 0.01 - | $422.26 | - | $338.52 | 0.00 | 1.75 | +$0.00B+24.74% | Held |
| 11 | ALPHABET INC CAP STK CL AGOOGL | 0.00 | 0.91% | 0.02 - | $176.25 | $375.95 +113.30% | $70.88 | 0.00 | 2.75 | +$0.00B+430.44% | Held |
| 12 | SERITAGE GROWTH PROP- ASRG | 0.00 | 0.50% | 0.50 - | $3.08 | - | $37.55 | 0.00 | 7.00 | -$0.02B-91.80% | Held |
| 13 | ALPHA METALLURGICAL RESOUR I COMAMR | 0.00 | 0.29% | 0.01 - | $112.50 | - | $125.25 | 0.00 | 0.50 | -$0.00B-10.18% | Held |
| 14 | CORE NATURAL RESOURCES INC COM SHSCNR | 0.00 | 0.24% | 0.01 - | $69.74 | - | $77.09 | 0.00 | 0.50 | -$0.00B-9.54% | Held |
Showing 1-14 of 14
"Holding Period (yrs)" is the latest uninterrupted holding duration, calculated by dividing continuous reported quarters by 4.
Cost basis is an estimate and can differ materially from the actual cost, especially in edge cases.
Cost basis estimate: from the latest uninterrupted holding period, new or increased shares are added to the cost pool at the report price; reductions remove shares at the then-average cost. Example: buy 100 shares at $10 in Q1 and add 50 shares at $16 in Q2, estimated cost basis is (100 x 10 + 50 x 16) / 150 = $12 per share.
Return shows estimated dollar return on top and percentage return below. It uses current price when available, otherwise report price.
Portfolio Visuals
Track portfolio value, position weights and Top 10 history.