Yield Theory is a stock research membership for investors who want to understand what they own, not just follow tips.

What’s inside

• In-depth stock research: every member issue and the full archive, plus new research throughout the month. Each piece covers the thesis, the model, the catalysts and the risks, with the source behind every number.
• AI research: follow the buildout from chips to memory to power to cash flow, and find the companies behind the headlines.
• The fundamental research course: learn to read a 10-K, follow the dollar through a business, value it from its cash flows, and write a thesis you can defend. Beginner friendly.
• Interactive labs: move the assumptions in a DCF or reverse DCF yourself, and see what the price is really asking for.
• Open datasets: AI capex from Microsoft, Amazon, Alphabet and Meta. Every row keeps the company’s own definition, period and source, and downloads as CSV or JSON.
• Congress trades: stock trades disclosed by House members, organized by member and by ticker.
• Stock profiles, calculators and a glossary: plain-English company profiles across the S&P 500, valuation and AI calculators, and definitions for the terms that matter.

New research, lessons, labs and datasets are added regularly.