What Guy Spier bought and sold in Q3 2025

In Q3 2025, Guy Spier (Aquamarine Capital) added to 1, trimmed 1. The book stood at $317M across 14 positions, filed Oct 20, 2025.

Changes vs the prior quarter's 13F, long US equity positions only (no shorts, options, or non-US listings). ADD/TRIM are share- count changes of ±20% or more. Sourced from SEC EDGAR. Not investment advice.