Aquamarine Zurich AG SEC 13F Filing (Q2 2026) — Holdings & Portfolio
Aquamarine Zurich AGCIK: 0001953324
Sector-focusedQuality / disciplined sizingConcentrated strategy
Total reported value
$144.1M
Reporting period: 2026-06-30 · Number of holdings: 7
Aquamarine Zurich AG disclosed 7 holdings in its latest 13F filing for the period ending 2026-06-30, with total reported value of $144.1M and a quarterly turnover rate of 6.3%.
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Personality snowflake
- Concentration
- 79.3
- Portfolio Stability
- 6.29
- Momentum
- 50
- Sector conviction
- 100
- Diversification
- 14
- Sizing Uniformity
- 93.27
Aquamarine Zurich AG's disclosed holdings carry a Herfindahl concentration index of 0.198 — mathematically equivalent to about 5 equally-sized positions, close to its 7 actual disclosed holdings. Value is spread relatively evenly across the portfolio rather than concentrated in a handful of names.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.67), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 46% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Source and citation information
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Recent moves
View source Form 13F filing on SEC.govAdd AXP
0.0% $2.3M
Add DJCO
0.0% $1.4M
Trim BRK-B
0.0% $2.1M
Trim MA
0.0% $558.0K
Trim BRK-A
0.0% $922.0K
Add RACE
0.0% $1.1M
Holdings Map
New buyAddUnchangedTrim
Top 10 holdings by weight
Full holdings list this quarter
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | BRK-B | Berkshire Hathaway Inc-cl B | Stock-Other | 33.89% | -0.68% | — | |
| 2 | BRK-A | Berkshire Hathaway Inc-cl A | Stock-Other | 15.59% | -0.33% | — | |
| 3 | AXP | American Express Co | Stock-Financials | 15.26% | +0.73% | — | |
| 4 | MA | Mastercard Inc - A | Stock-Financials | 14.26% | -0.51% | — | |
| 5 | MCO | Moody's CORP | Stock-Financials | 8.49% | -0.22% | — | |
| 6 | RACE | Ferrari N.V. | Stock-Consumer Disc | 7.71% | +0.31% | — | |
| 7 | DJCO | Daily Journal CORP | Stock-Other | 4.80% | +0.70% | — |
Portfolio Performance
Performance for Q3 2026
—
Performance Last 4 Quarters
+7.1%
Based on 50% of reported portfolio value with available pricing
- Stdev
- +17.4%
- Beta
- +1.02
- Alpha
- +1.6%
- Max Drawdown
- -11.1%
- Annualized Perf
- +24.2%
- Batting Avg vs S&P
- +60.6%
- Sortino
- +2.74
- Stutzer
- +0.4
- Treynor
- +0.23
- Sterling
- +1.2
- Calmar
- +2.18
- Information Ratio
- +0.19
- Tracking Error
- +10.8%
- Stdev Down
- +8.5%
- Winning Months %
- +66.7%
- Losing Months %
- +33.3%
- Best 12 Months
- +55%
- Worst 12 Months
- +6.4%
- Efficiency Ratio
- +0.56
- Sharpe
- +1.34
- Stdev Sectors
- +33.1%
- Skewness
- +0.15
- Kurtosis
- -0.12
- Upside Potential
- +4.47
Reported value over time
Sector allocation
Sector allocation over time
Quarterly history
| Period | Holdings | Total value | Stability | Top holdings | |
|---|---|---|---|---|---|
| 2026 Q2 | 7 | $144.1M | 6 | ||
| 2026 Q1 | 7 | $135.3M | 9 | ||
| 2025 Q4 | 7 | $147.5M | 74 | ||
| 2025 Q3 | 14 | $317.4M | 14 | ||
| 2025 Q2 | 14 | $309.8M | 0 | ||
| 2025 Q1 | 14 | $293.7M | 0 | ||
| 2024 Q4 | 14 | $287.6M | 0 | ||
| 2024 Q3 | 14 | $285.6M | 0 | ||
| 2024 Q2 | 14 | $262.6M | 0 | ||
| 2024 Q1 | 12 | $261.9M | 0 | ||
| 2023 Q4 | 12 | $228.7M | 0 | ||
| 2023 Q3 | 12 | $202.8M | 0 | ||
| 2023 Q2 | 12 | $209.8M | 0 | ||
| 2023 Q1 | 12 | $193.4M | 0 | ||
| 2022 Q4 | 12 | $185.9M | 0 | ||
| 2022 Q3 | 12 | $164.4M | 0 |
Holding changes this quarter
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | AXP | American Express Co | +0.7% | — | Unchanged |
| 2 | DJCO | Daily Journal CORP | +0.7% | — | Unchanged |
| 3 | RACE | Ferrari N.V. | +0.3% | — | Unchanged |
| 4 | MCO | Moody's CORP | -0.2% | — | Unchanged |
| 5 | BRK-A | Berkshire Hathaway Inc-cl A | -0.3% | — | Unchanged |
| 6 | MA | Mastercard Inc - A | -0.5% | — | Unchanged |
| 7 | BRK-B | Berkshire Hathaway Inc-cl B | -0.7% | — | Unchanged |
Filing History
FAQ
What is Aquamarine Zurich AG and what type of investor is it?
Aquamarine Zurich AG is an investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2026-06-30), the firm manages a tracked equity portfolio valued at approximately $144.1M, spread across 7 disclosed positions.
What are Aquamarine Zurich AG's largest equity positions?
Based on the latest 13F filing, Aquamarine Zurich AG's top holdings by market value are:
1. Berkshire Hathaway Inc-cl B (BRK-B) — $48.8M (33.9%)
2. Berkshire Hathaway Inc-cl A (BRK-A) — $22.5M (15.6%)
3. American Express Co (AXP) — $22.0M (15.3%)
4. Mastercard Inc - A (MA) — $20.5M (14.3%)
5. Moody's CORP (MCO) — $12.2M (8.5%)
What changes did Aquamarine Zurich AG make in its most recent portfolio filing?
No notable portfolio changes were recorded for Aquamarine Zurich AG in the most recent quarter. Holdings appear to have remained relatively stable.
What sectors does Aquamarine Zurich AG focus on?
Aquamarine Zurich AG is concentrated in the following sectors based on its current disclosed equity portfolio:
• Financials: 83.1%
• Consumer Discretionary: 16.9%
Investment Profile
Aquamarine Zurich AG's portfolio is concentrated and long-term-holding, with 83.1% of the portfolio concentrated in Financials.
Its concentration score has risen from 57 to 79 over the past 4 quarters — a shift toward higher-conviction positions.
It has added to its RACE position for two straight quarters, increasing it by $1.6M to reach $11.1M.
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