SEC EDGAR Form 13F
Aquamarine Zurich
Aquamarine Zurich is a Form 13F reporting manager associated with Guy Spier and value-oriented public-equity investing.
Latest Form 13F: 7 long U.S. equity positions, $144,091.00 reported value for the period ended Jun 30, 2026, led by BERKSHIRE HATHAWAY INC DEL, BERKSHIRE HATHAWAY INC DEL, and AMERICAN EXPRESS CO.
CIK: 1953324 · Filed: Jul 10, 2026 · Period: Jun 30, 2026
What a 13F does not show
Form 13F covers many reportable long U.S. equity positions at quarter end. It does not show every asset type, short positions, hedges, intraperiod trades, or current holdings after the report date. Use it as ownership context, not investment advice.
Read the 13F guide →Top reported holdings
Showing the top 7 positions by reported value. Source: SEC EDGAR Form 13F; period 2026-06-30; filed 2026-07-10.
| # | Ticker | Company | Shares | Value | Portfolio % | QoQ change |
|---|---|---|---|---|---|---|
| 1 | BRKB | BERKSHIRE HATHAWAY INC DEL | 97.6K | $48,838.00 | 33.89% | +0.0% |
| 2 | BRKA | BERKSHIRE HATHAWAY INC DEL | 30 | $22,466.00 | 15.59% | +0.0% |
| 3 | AXP | AMERICAN EXPRESS CO | 65.0K | $21,986.00 | 15.26% | +0.0% |
| 4 | MA | MASTERCARD INCORPORATED | 40.0K | $20,544.00 | 14.26% | +0.0% |
| 5 | MCO | MOODYS CORP | 27.0K | $12,229.00 | 8.49% | +0.0% |
| 6 | RACE | FERRARI N V | 30.0K | $11,114.00 | 7.71% | +0.0% |
| 7 | DJCO | DAILY JOURNAL CORP | 11.5K | $6,914.00 | 4.80% | +0.0% |