The founder library.

Peter Lynch

Buying what you know: your daily life as legitimate research. The gentlest serious book in finance.

In Theia: What Is A Stock? · Price vs Value

Benjamin Graham

The original price-vs-value discipline, and the famous idea of the market as a moody business partner.

In Theia: Price vs Value · Risk

Philip Fisher

What makes a business genuinely excellent — and the patience to hold one.

In Theia: What Is A Stock? · Growth Expectations

Warren Buffett, arranged by Lawrence Cunningham

Ownership thinking, temperament, and the clearest business writing in the field.

In Theia: What Is Investing? · Price vs Value

Graham & Dodd

The deep end of valuation. Not a beginner book; listed for honesty about where the ideas come from.

In Theia: Valuation

Mark Douglas

Why discipline beats prediction, and how professionals think in probabilities instead of certainties.

In Theia: Trading Rules · Trading vs Investing

Brett Steenbarger

101 short, practical lessons on managing yourself — the actual hardest position.

In Theia: Overchecking · Revenge Trading

Brett Steenbarger

Skill-building as deliberate practice: treating trading like a performance discipline, not a mood.

In Theia: Trading Rules · Building A Real Investment Process

Jack Schwager

Interviews with great traders. The recurring theme is not genius — it's risk control and survival.

In Theia: Survival · Position Sizing

SMB Capital

How a professional trading desk actually trains people: process, review, and playbooks.

In Theia: Trading Rules · Building A Real Investment Process

Charles Kindleberger

The anatomy of every bubble: same stages, new costumes, for four hundred years.

In Theia: Bubbles · Crowd Psychology

Edward Chancellor

A history of speculation — proof that your FOMO has excellent historical company.

In Theia: Bubbles · FOMO

Michael Lewis

2008 as a story you can actually follow: incentives, leverage, and the loneliness of being early.

In Theia: Bubbles · Tail Risk

Michael Lewis

Inside a 1980s trading floor — how the industry's culture was built, cigar smoke included.

In Theia: Trading vs Investing

Roger Lowenstein

Nobel-level brains, catastrophic leverage: why intelligence does not exempt anyone from risk math.

In Theia: Leverage · Tail Risk

Morgan Housel

Nineteen short essays on why smart people do ruinous things with money. Read this one first.

In Theia: Risk · Cash Is Not Stupid · Life Outside Markets

Vicki Robin

Money as life energy: what you're actually trading for every purchase.

In Theia: Asset vs Lifestyle Purchase

George Clason

Pay-yourself-first and other ancient basics that survived because they work.

In Theia: Cash Is Not Stupid · What Is Investing?

U.S. Securities and Exchange Commission

Plain-language official explanations of stocks, bonds, funds, and fraud warnings. The reference Theia checks definitions against.

In Theia: What Is A Stock? · What Is A Bond? · What Is An ETF?

Financial Industry Regulatory Authority

How brokers and markets are supervised, plus practical scam-avoidance tools.

In Theia: Risk · Scams And Yield Traps

Federal Reserve and peers

What interest rates and inflation actually are, from the people who set and measure them.

In Theia: What Is Inflation? · Interest Rates

Nasdaq, NYSE, major fund issuers

Mechanics of listings, orders, and funds — from the venues themselves. Mind the marketing around the education.

In Theia: What Is An ETF? · Volume

Aswath Damodaran (NYU)

The reference for how businesses get valued — much of it freely published lectures and notes.

In Theia: Valuation · P/E Ratio

The companies themselves

The primary source. Start with a brand you know and read how it describes its own risks.

In Theia: Balance Sheet · Revenue

Berkshire Hathaway and others

How owners talk about businesses when they write to partners instead of the press.

In Theia: What Is Investing? · Valuation