Guy Spier
Aquamarine Zurich AG
| Stock 14 | % of Portfolio Weight of this holding as a percentage of the total portfolio | Value Total dollar value of the position (shares x price) | Shares Number of shares held | Reported Price Price per share as reported in the SEC filing | Recent Activity Activity in the most recent 13F filing with percentage change | Current Price within 52W Range Current stock price positioned within the 52-week high/low range | +/- Reported Price Percentage change from the filing reported price to the current price. Green = gain, Red = loss |
|---|---|---|---|---|---|---|---|
 B BRK-B BERKSHIRE HATHAWAY INC DEL | 40.16% | $49.00M | 97,600 | $502.05 | Reduce 30.58% | $477.35 $459.11 $539.80 | -4.92% |
 A AXP AMERICAN EXPRESS CO | 19.67% | $24.00M | 65,000 | $369.23 | Reduce 69.05% | $300.18 $228.99 $382.83 | -18.70% |
 M MA MASTERCARD INCORPORATED | 18.03% | $22.00M | 40,000 | $550.00 | Reduce 39.16% | $493.44 $477.16 $597.27 | -10.28% |
 M MCO MOODYS CORP | 10.65% | $13.00M | 27,000 | $481.48 | — | $440.79 $393.59 $538.45 | -8.45% |
 F RACE FERRARI N V | 7.38% | $9.00M | 30,000 | $300.00 | Reduce 50.00% | $340.00 $314.63 $517.65 | +13.33% |
 D DJCO DAILY JOURNAL CORP | 4.10% | $5.00M | 11,500 | $434.78 | — | $517.94 $365.66 $664.72 | +19.13% |
 B BRK-A BERKSHIRE HATHAWAY INC DEL | 0.02% | $22.00K | 30 | $733.33 | — | $716,300 $692,600 $809,350 | +97577.27% |
 A BABA ALIBABA GROUP HLDG LTD | 0.00% | $0 | 0 | $0.00 | Sold | $122.05 $97.72 $189.34 | — |
 A GOOGL ALPHABET INC | 0.00% | $0 | 0 | $0.00 | Sold | $295.77 $144.20 $343.45 | — |
 S SRG SERITAGE GROWTH PPTYS | 0.00% | $0 | 0 | $0.00 | Sold | $2.83 $2.43 $4.56 | — |
 M MU MICRON TECHNOLOGY INC | 0.00% | $0 | 0 | $0.00 | Sold | $366.24 $64.57 $461.54 | — |
 C CNR CORE NATURAL RESOURCES INC | 0.00% | $0 | 0 | $0.00 | Sold | $104.25 $63.38 $113.23 | — |
 B BAC BK OF AMERICA CORP | 0.00% | $0 | 0 | $0.00 | Sold | $49.38 $33.63 $56.93 | — |
 A AMR ALPHA METALLURGICAL RESOUR I | 0.00% | $0 | 0 | $0.00 | Sold | $209.31 $99.46 $249.65 | — |
News about Guy Spier's top holdings
Frequently Asked Questions
What stocks does Guy Spier own in 2026?
As of Q1 2026, Guy Spier's Aquamarine Zurich AG holds 14 stocks worth $122.02M. The largest position is BRK-B. Data from SEC 13F filing dated 2026-01-15 00:00:00.000Z.
What did Guy Spier buy and sell recently?
View the Activity tab above to see which positions Guy Spier added, increased, decreased, or sold in Q1 2026. The activity data comes from comparing consecutive 13F filings.
What is Guy Spier's top stock holding?
The largest position is BRK-B. Guy Spier's Aquamarine Zurich AG holds 14 total positions worth $122.02M. Visit the holdings table above to see the complete portfolio ranked by position size.
What sectors does Guy Spier invest in?
Guy Spier's portfolio of 14 stocks is diversified across multiple sectors. The portfolio is most concentrated in the Financial Services sector. The sector chart above shows the full allocation breakdown by portfolio value.
What is Guy Spier's investment strategy?
Guy Spier manages Aquamarine Zurich AG using a value investment approach. The portfolio currently holds 14 positions with total assets of $122.02M. The portfolio is most concentrated in the Financial Services sector.
What is Guy Spier's portfolio worth in 2026?
Guy Spier's Aquamarine Zurich AG manages $122.02M in disclosed 13F holdings across 14 positions as of Q1 2026. This represents the total market value of equity positions reported to the SEC.
How often does Guy Spier update portfolio holdings?
Guy Spier's Aquamarine Zurich AG files 13F reports with the SEC quarterly. The most recent filing is dated 2026-01-15 00:00:00.000Z, covering holdings as of Q1 2026. New data appears within 24 hours of each filing.
How do I track Guy Spier's portfolio changes over time?
Use the Activity tab to compare Guy Spier's holdings across quarters. You can see new positions, additions, reductions, and exits for each quarter going back multiple years. The data comes from Aquamarine Zurich AG's SEC 13F filings.