Build your framework

The mental models behind Buffett's investing — moats, intrinsic value, owner earnings, and more, each traced through the letters.

The full archive of Warren Buffett's annual letters, annotated with concepts and company mentions.

How Buffett thought about the businesses he bought — the rationale, the numbers, and the lessons.

The investors and managers who shaped Buffett's thinking, and what each one teaches.

Plain-English definitions of every investing term used across ValueOS, each linking back to the source concept.

Straight answers about the ValueOS Score, the tools, the methodology, and how to use the site.

See how letters, concepts, companies, and people connect — and follow the threads that interest you.