Guy Spier portfolio: what Aquamarine (Curych) holds
A value investor from Zurich and the author of The Education of a Value Investor.
Stock portfolio value
$144.1M
Stock positions
7
Report date
30 June 2026
Filed
10 July 2026
Largest positions
| # | Company | Weight | Value | Last quarter |
|---|---|---|---|---|
| 1 | Berkshire Hathaway Inc Del (Cl B New)BRK.B | 33.9% | $48.8M | — |
| 2 | Berkshire Hathaway Inc Del (Cl A)BRK.A | 15.6% | $22.5M | — |
| 3 | American Express CoAXP | 15.3% | $22.0M | — |
| 4 | Mastercard IncorporatedMA | 14.3% | $20.5M | — |
| 5 | Moodys CorpMCO | 8.5% | $12.2M | — |
| 6 | Ferrari N V | 7.7% | $11.1M | — |
| 7 | Daily Journal CorpDJCO | 4.8% | $6.9M | — |
Source: SEC filing. Values count stock positions only; options are left out of the totals and tables.
How to use this page
A 13F filing shows what a manager held on the last day of a quarter, published up to 45 days later. It is a snapshot, not a trading signal: the manager may already have bought or sold since. Learn more in How to read 13F filings.
For information only, not investment advice. 13F filings are delayed by up to 45 days and do not show cash, bonds, short positions or non-US stocks.