Guy Spier's BRK.B Position Overview
Guy Spier (via Aquamarine Zurich Ag) currently holds 140.6K shares of Berkshire Hathaway Inc. (BRK.B) worth $70.68 M, representing 22.27% of the portfolio. First purchased in 2014-Q4, this long-term strategic position has been held for 44 quarters.
Based on 13F filings since 2013, Guy Spier has maintained a long-term strategic position in BRK.B, representing a significant commitment to this investment thesis.
Analysis based on 13F filings available since 2013 Q2
Guy Spier's Berkshire Hathaway (BRK.B) Holding Value Over Time
Track share changes against reported price movement
Quarterly Berkshire Hathaway (BRK.B) Trades by Guy Spier
| Period | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q4 2014 | +140,601 | Add 0.00% | 140,600 | $150.15 |
| Q1 2015 | -140,600 | Sold Out | 140,600 | $0.00 |
| Q4 2016 | +140,600 | New Buy | 140,600 | $162.98 |
| Q3 2022 | +140,601 | Add 0.00% | 140,600 | $267.02 |
Guy Spier's Berkshire Hathaway Investment FAQs
Guy Spier first purchased Berkshire Hathaway Inc. (BRK.B) in Q4 2014, acquiring 140,600 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Guy Spier has held Berkshire Hathaway Inc. (BRK.B) for 44 quarters since Q4 2014. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Guy Spier's largest addition to Berkshire Hathaway Inc. (BRK.B) was in Q4 2014, adding 140,600 shares worth $21.11 M. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
According to the latest 13F filing for Q3 2025, Guy Spier's firm, Aquamarine Zurich Ag, owns 140,600 shares of Berkshire Hathaway Inc. (BRK.B), valued at approximately $70.68 M. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
As of the Q3 2025 filing, Berkshire Hathaway Inc. (BRK.B) represents approximately 22.27% of Guy Spier's publicly disclosed stock portfolio, making it one of their key holdings. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Guy Spier's peak holding in Berkshire Hathaway Inc. (BRK.B) was 140,600 shares, as reported at the end of Q4 2014. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.