Talking Billions with Bogumil Baranowski

David Diranko: Contrarian Cash Flows: The Data Scientist Who Became a Contrarian Investor

Jan 5, 2026
David Diranko, a 29-year-old mathematician and founder of Diranko Capital, shares his unique journey from data science to contrarian investing. He discusses how mathematical rigor shapes his investment strategies, focusing on probabilistic thinking and the value of small-cap European markets. David openly describes the benefits of publishing his research for community building while addressing the challenge of balancing transparency with proprietary insights. He delves into investing in predictable businesses facing temporary issues and the importance of cash flow in valuations.
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INSIGHT

Intrinsic Value Is A Probabilistic Range

  • David Diranko treats intrinsic value as a probabilistic range rather than a single number.
  • He uses mathematical rigor and probabilistic thinking to build investment theses like mathematical proofs.
ANECDOTE

From IBM Data Scientist To Full-Time Investor

  • David moved from IBM data science work to full-time investing after working 40 hours at IBM and 30 hours a week on investing.
  • He launched Diranko Capital once family priorities and outside interest made entrepreneurship feasible.
ADVICE

Write Research Publicly To Force Clarity

  • Write down research publicly to reveal gaps and force clarity in your thinking.
  • Use public writing to build feedback, accountability, and distribution for your work.
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