Think Like Buffett.
Decide with Data.
Value Investing Decision OS · Powered by Buffett's Timeless Principles
ValueOS Stock Score
Stock scoring system based on Buffett's investment principles, evaluating stocks across Business Quality, Financial Strength, and Valuation
Your Value Investing Journey
Three steps to build your investment system: learn, analyze, decide
Learn
Learn Buffett's investment philosophy and core concepts — understand what real value investing means
Complete Buffett Strategy Guide →Analyze
Use tools like the DCF Calculator and Moat Analyzer to quantitatively analyze specific stocks
DCF Calculator →Decide
Phase 2/3 unlocks: real-time stock monitoring, personalized portfolio tracking, and advanced analytics
Coming SoonBuild Your Investment Framework
Each concept connects directly to Buffett's original writings, cross-referenced across decades of shareholder letters.
Accounting Earnings vs. Economic Reality
GAAP earnings are a useful abstraction that often diverge significantly from the true economic earnings of a business.
Asymmetric Risk
The search for investments where the upside significantly exceeds the downside, converting uncertain propositions into favorable ones.
Book Value vs. Intrinsic Value
Book value (accounting net worth) vs. intrinsic value (true economic worth); Buffett increasingly emphasizes intrinsic value as the only meaningful metric.
Cash is King
Cash flow, not accounting earnings, determines a business's ability to create value over time.
Circle of Competence
The boundary of what an investor truly understands; staying within this circle is essential for making good investment decisions.
Derivatives as Time Bombs
Complex financial instruments that Buffett has repeatedly called 'weapons of mass destruction' due to their hidden leverage and systemic risks.
Every Letter, Every Year
The complete collection of Buffett's shareholder letters, from 1965 to 2024 — organized, searchable, and cross-referenced.
Letter to Shareholders
Buffett's letter discussing the impact of AI and technology, the enduring value of Berkshire's culture, and the legacy of Charlie Munger who passed away in late 2023.
Letter to Shareholders
Buffett's letter during the COVID-19 pandemic, discussing Berkshire's resilience, the importance of long-term focus, and the enduring power of American business.
To the Shareholders of Berkshire Hathaway
A candid letter on Berkshire's evolving investment in Apple, the case for share repurchases, and the importance of intangibles in modern valuation.
Letter to Shareholders
Buffett discusses the new stock buyback policy, the increased investment in Apple, and the importance of intrinsic value in capital allocation decisions.