Build for investors who want more than quotes.
The most comprehensive English-language archive of Warren Buffett's wisdom — from the first Partnership letter in 1956 to the 2025 farewell. Letters, annual meetings, speeches, books, and quotes — all tagged, linked, and explorable.
Every partnership letter (1956–1970), Berkshire shareholder letter (1971–2025), and key special letter — fully indexed and searchable.
Full transcripts and key Q&A highlights from Berkshire Hathaway annual meetings (2015–2025). Buffett's most candid moments.
Buffett's most influential talks — from the Florida MBA lecture to the Superinvestors of Graham-and-Doddsville.
150+ investment concepts cross-referenced across letters, with first appearance, refinement, and key-quote tags.
Search by concept, company, person, or keyword. Every entity is linked — click through to see every letter that mentions it.
Ask natural-language questions about any letter or concept. Our RAG engine retrieves the relevant passages and generates an answer.
All letter texts are sourced from the official Berkshire Hathaway website and open-source transcript projects. We do not claim copyright over any material — it is provided for educational and research purposes.
Every letter is read and tagged with the investment concepts it discusses. A cross-reference is created when a concept is central to a letter (marked as “key”), marks its first appearance (“first”), represents a refinement of prior thinking (“refinement”), or is simply mentioned (“mention”).
Company and people mentions are identified by keyword matching and manual review. Each mention includes the relevant passage from the letter.
This is an open project. If you find an error in letter text, concept assignment, or cross-reference, we welcome corrections. Open an issue or pull request on GitHub.
View on GitHubBuffettKnowledge is the most comprehensive English-language archive of Warren Buffett's wisdom, spanning from his first Partnership letter in 1956 to the 2025 farewell. The archive includes shareholder letters, annual meeting transcripts, famous speeches, recommended books, and quotes — all tagged with investment concepts, companies, and people mentioned, creating a fully cross-referenced knowledge base for value investors.
Yes. All letter texts are sourced from the official Berkshire Hathaway website and open-source transcript projects. We do not claim copyright over any material — it is provided for educational and research purposes.
Every letter is read and tagged with the investment concepts it discusses. A cross-reference is created when a concept is central to a letter ("key"), marks its first appearance ("first"), represents a refinement of prior thinking ("refinement"), or is simply mentioned ("mention").
The AI Q&A feature uses retrieval-augmented generation (RAG) to answer questions about Buffett's letters, investment philosophy, specific companies, and historical market context. It retrieves relevant passages and synthesizes answers with source citations.
We continuously add full-text content, cross-references, and interpretations. New Berkshire letters are added annually after publication. Check the Changelog page for a complete history of updates.