Portrait of Guy Spier

Superinvestor · snapshot Q4 2025

Guy Spier

Aquamarine Capital

qualityvalue

Value investor in the Pabrai/Buffett mould. Portfolio of durable moats and stable cash generators, long holds, minimal turnover.

Prism interpretation

Slow-turnover quality value — minimal trading, long-duration holds.
Focused — meaningful conviction in a handful of names.

Concentration profile

Positions

6

Top 1

28%

Top 5

90%

Top 10

100%

Effective N

5.3

Holdings · 6

Curated summary

Click any ticker for the full Prism report.

  1. 01
    BRK.BBerkshire Hathaway +5 others
    18.1%
  2. 02
    AXPAmerican Express +1 other
    13.2%
  3. 03
    MKLMarkel Group +2 others
    9.9%
  4. 04
    GOOGLAlphabet +12 others
    9.1%
  5. 05
    MAMastercard +2 others
    7.6%
  6. 06
    WFCWells Fargo +1 other
    6.1%

How this book compares

6 of Guy Spier's holdings also appear in at least one other tracked portfolio. Cross-held names are flagged above with the +N others mark. The full consensus book is available on the Grand Portfolio page.

Tracked alongside 29 other superinvestors.

Source noteIllustrative reconstruction from Aquamarine Fund disclosures, period ending Dec 31 2025.

Reporting date: December 31, 2025. 13F filings disclose only US long-equity positions and lag real time by 45 days. Educational use only.