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Head-to-head comparison

Seth Klarman vs Stephen Mandel

Seth Klarman
Baupost Group
Q9/10
"Margin of safety. Cash is a position. Patience pays."
6 positionsSince 1982
Stephen Mandel
Lone Pine Capital
Q9/10
"Long-only growth at a reasonable price. Deep research. Tiger Cub."
5 positionsSince 1997

Recent moves — Q4 2025

Latest quarter activity for each manager.

Seth Klarman
  • GOOGADD +40%
    Building out new Alphabet position.
  • VSTADD +25%
    Aggressive Vistra add — AI data center demand thesis.
  • WBDREDUCE -12%
    Continued Warner Bros. profit-taking.
Stephen Mandel
  • METAADD +3%
    Small add — already a top Lone Pine position.
  • FTNTNEW
    New Fortinet cybersecurity position.

Data sourced from 13F filings with the SEC. Overlap in top positions is a concrete consensus signal, not investment advice.