Guy Spier
Aquamarine Zurich AG — managed by Guy Spier; US equity positions disclosed quarterly via SEC 13F
Data as of 2026-03-31 (filed 2026-04-17) · Source: SEC EDGAR
Aquamarine Zurich AG's most recent 13F filing, for the quarter ended 2026-03-31, reports 7 positions worth $135.3M. The top 5 holdings represent 88% of that value, a concentrated portfolio.
The single largest position is Berkshire Hathaway Inc at 34.6% of the portfolio, followed by Berkshire Hathaway Inc at 15.9% and Mastercard Incorporated at 14.8%.
Against the prior quarter, Guy Spier opened 0 new positions, exited 0, added to 0, and trimmed 0.
Across all 8 quarters on file, Berkshire Hathaway Inc has appeared in every filing, as has Berkshire Hathaway Inc. Berkshire Hathaway Inc currently ranks first by value.
A 13F is filed roughly 45 days after quarter-end and covers only long positions in US-listed equities, so it is a lagging and partial view of the portfolio. Source: SEC EDGAR.
- Value$46.8MWeight (prev→now)33.3% → 34.6%
- Value$21.5MWeight (prev→now)15.3% → 15.9%
- Value$20.0MWeight (prev→now)15.5% → 14.8%
- Value$19.7MWeight (prev→now)16.3% → 14.5%
- Value$11.8MWeight (prev→now)9.3% → 8.7%
- Value$10.0MWeight (prev→now)6.5% → 7.4%
- Value$5.5MWeight (prev→now)3.8% → 4.1%
Sources· SEC EDGAR 13F as of 2026-04-17
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