Seth Klarman
A contrarian streak married to a calculator. Puts "don't lose money" before making it, holds cash patiently, and swings only with a real margin of safety.
Founded The Baupost Group in 1982, now managing ~$30B. Author of the value-investing bible Margin of Safety (out of print, $1,000+ used). Known for extreme risk-aversion and holding large cash piles awaiting his pitch — often called 'the Boston Buffett.'
Baupost files a 13F (≈45-day lag). Klarman wrote the legendary out-of-print Margin of Safety. Note: the 13F shows only listed-equity longs — much of his capital sits in cash, distressed debt, and special situations not captured here.
Holdings & weights
Q1 2026 · 13F (as of 31 Mar 2026)Weights are by market value, from real 13F / daily disclosure. This is a snapshot and will change — see live: Live 13F weights & activity on dataroma
A top holding among his listed-equity longs.
Analyze through a master's lensA cash-generative franchise brand.
Analyze through a master's lensAn industrial electrical distributor.
Analyze through a master's lensA health insurer bought on weakness.
Analyze through a master's lensnew Aon Plc, new Visa Inc., new Teleflex, Eagle Materials Inc. −25%, Genuine Parts +0%, Liberty Global Ltd CL C −36%, Americold Realty Trust +124%, Molina Healthcare Inc. +1%.
In their own words
Value investing is the marriage of a contrarian streak and a calculator.
Value investing requires hard work, unusually strict discipline, and a long-term horizon.
Where to follow them
Primary sources. Read the original — don't settle for second-hand summaries.
Run any stock you care about through the "Quantitative · Margin of Safety" lens.
Keep exploring
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