About ValueOS
Our Mission
ValueOS is the investment decision operating system — a free platform that combines Warren Buffett's six decades of shareholder letter wisdom with real-time financial data to help you make better-informed, data-driven value investments.
We believe the best investment framework already exists: it's embedded in Buffett's 60 years of candid, instructive letters to shareholders. ValueOS extracts that wisdom, structures it, and pairs it with modern financial analysis tools — so you can think like Buffett and decide with data.
How It Works
Learn
Build the mindset.
65+ years of Buffett's wisdom — 97 shareholder letters, 25 core concepts, cross-referenced by his own words. Understand why before you analyze.
Analyze
See the signal in the noise.
Score, Moat, and DCF — three tools on one framework. Screen for quality, price intrinsic value, and decide with data, not emotion.
Decide soon
Watch, then act.
Great companies are easy to find; the right price is rare. Track the ones you believe in — ValueOS tells you the moment they reach your margin of safety.
Methodology
Letter Sources: All shareholder letter content is sourced from the official Berkshire Hathaway website. We extract and structure the text for optimal search and cross-referencing.
Financial Data: Stock fundamental data comes from the SEC EDGAR XBRL API — the official, free source of all U.S. company filings. Current prices are sourced from Alpha Vantage. Both are updated periodically.
Valuation Engine:Our DCF calculator, Owner Earnings formula, and ValueOS Score are implemented from Buffett's described methodology — not AI guesses. All calculations are transparent and auditable.
Accuracy: All letter quotes are verified against original sources. Financial data is pulled directly from SEC filings. Where data is unavailable, we display N/A rather than estimated values.
Freshness & review cadence: Letter text is curated once and version-controlled; financial figures and every DCF, Score, and Moat result are recomputed from the latest SEC filings and refreshed on a rolling basis, so a ranking or valuation reflects the most recent annual report available rather than a stale snapshot.
What we never do: we do not generate financial figures, prices, or letter text with AI, and we never gate core content behind a paywall. Every number on ValueOS is traceable to a primary source — a Berkshire letter or an SEC filing. Our full editorial standards are published in the Editorial Policy & Methodology.
What's Inside
Shareholder Letters
8888 of Buffett's letters (1977–2024) with full text, searchable by year and concept
Investment Concepts
40Core frameworks — Economic Moat, Margin of Safety, Circle of Competence — cross-referenced across all letters
Company Mentions
22Every company Buffett discusses across the letters, with direct letter citations
Stock Analysis
50+DCF valuations, Owner Earnings, and ValueOS Scores for 50+ U.S. stocks
Technology
ValueOS is built with modern web technologies for speed, accessibility, and SEO:
- →Next.js 15 — React framework with static site generation
- →TypeScript — Type-safe, maintainable codebase
- →Tailwind CSS — Dark-first design with gold accent system
- →SEC EDGAR API — Free official U.S. company financial data
- →Pagefind — Static search with zero runtime dependencies
Disclaimer
ValueOS is an educational resource and is not affiliated with Warren Buffett, Berkshire Hathaway, or any of its subsidiaries. All shareholder letter content is the intellectual property of Berkshire Hathaway and is used under fair use for educational purposes. All financial data is sourced from public SEC filings and is provided for informational purposes only.
This website does not provide investment advice. Nothing on ValueOS should be construed as a recommendation to buy or sell any security. Always conduct your own research and consult with a qualified financial advisor before making investment decisions. Past performance is not indicative of future results.
ValueOS is an independent project and is not affiliated with, endorsed by, or connected to any other website or organization that shares the “ValueOS” name.
Editorial Standards
ValueOS is built and maintained by a small team of value-investing enthusiasts and software engineers. Our editorial principle is simple: every number you see is derived directly from primary sources — Berkshire Hathaway's shareholder letters and the SEC EDGAR XBRL filings — never from estimates or AI-generated figures. Read our full Editorial Policy & Methodology.
Last updated: July 2026. We review letter annotations and valuation methodology continuously and republish pages when data or interpretation improves.
Corrections: If you spot an error in a letter transcript, a financial metric, or a calculation, email hello@getvalueos.com and we will correct it and note the change here.
Contact
Have questions, feedback, or found an error? We'd love to hear from you. Email us at hello@getvalueos.com.