Whale Analyzer
📚 Investment Academy & 13F Research Guides
Learn investing fundamentals, SEC 13F filings, hedge fund holdings, value investing philosophy, and portfolio analysis tools through our curated collection of in-depth articles.
Indices & ETFs Illustrated feature · EN / ZH
A World in One Basket: Indices, ETFs, Returns and Risk
An illustrated guide to China, Hong Kong and US indices, with 229 catalogue entries, historical returns, CAGR and maximum drawdowns.
📖 Experience (7)
The Founder's Playbook: Building an AI-Native Startup
Reading notes on Anthropic's 36-page playbook. How AI reboots the startup lifecycle and what it means for investors evaluating AI-native companies.
Duan Yongping: Buying Stocks = Buying Companies
BBK founder Duan Yongping's investment philosophy distilled. From his $620K Buffett lunch to the core principle of treating stocks as businesses.
Munger's Psychology of Misjudgment: 24 Mental Traps
Deep analysis of Munger's 1995 Harvard lecture. How 24 psychological biases affect investment decisions, with modern examples.
Peter Lynch: Stock Picking Rules from Zero to Hero
Peter Lynch achieved 29.2% annual returns over 13 years. Why his methodology is particularly friendly to individual investors.
Buffett's Shareholder Letters: 50 Years of Wisdom
10 key investment principles distilled from 50+ shareholder letters, paired with market context from each era.
Howard Marks: The Art of Cycles and Risk
Even Buffett reads Howard's memos first. Understanding market cycles, assessing risk, and staying calm.
Li Lu: Value Investing in China
Munger's only Chinese disciple. From Tiananmen to Wall Street, and the legendary BYD investment case.
🧠 Philosophy (7)
Entrepreneurship, Values, and Building Wealth
A reflection on creating value, choosing a direction, building capabilities, and managing risk so that wealth supports a life you choose.
The Underlying Logic of Investing: Entrusting Capital to Value Creators
Long-term investing is less about predicting every price move and more about choosing the people, organizations, institutions, and assets most capable of compounding value over time.
First Principles of Value Investing
Why 'buying stocks = buying companies' isn't a slogan but the mathematical foundation of value investing.
Margin of Safety: Graham's Most Important Legacy
If you could learn only one concept from value investing, it's margin of safety. Explained with a bridge-building analogy.
Long-termism and the Power of Compound Interest
¥10K at 15% annual return for 50 years = ¥10.83M. Time is the most powerful weapon of value investors.
Contrarian Thinking: Be Greedy When Others Are Fearful
Munger says 'invert, always invert.' Data from 2008, 2020, 2022 crashes proves contrarian investing works.
Circle of Competence: Admitting Ignorance Is Wisdom
Duan says 'I don't invest in pharma because I don't understand it.' Buffett avoided tech in 2000 and was vindicated.
🔧 Tools (6)
Serenity X Stock Mentions: Every Ticker and Thesis Through May 31, 2026
A data-driven summary of every stock Serenity mentioned on X, with first-mention prices, source links, and high-conviction active charts.
DCF Valuation Model: A Practical Tutorial
Step-by-step DCF valuation using Apple as an example. From data gathering to valuation range, with formulas.
How to Read Financial Statements: Secrets of Three Reports
Income statement, balance sheet, cash flow — using Moutai's real financials to highlight the 10 most critical numbers.
A Practical SEC 13F Research Guide: From Filing to Reproducible Insight
A reproducible workflow for reading Form 13F: identify the right filing, verify period and units, separate trading from price effects, and account for amendments, splits, security classes, and disclosure limits.
Portfolio Construction: Kelly Criterion and Position Sizing
Duan says '2-3 stocks is enough.' How to scientifically size positions? The Kelly Criterion provides the math.
Porter's Five Forces: Is This Industry Worth Investing In?
Baijiu vs airlines: why the same revenue produces vastly different profits. Five Forces in practice.
📐 Fundamentals (4)
What is Discounted Cash Flow (DCF)?
DCF explained through buying a pancake stand. It earns ¥100K/year — how much would you pay? Zero formulas needed.
PE, PB, PEG Ratios Fully Explained
Is a PE of 20 expensive or cheap? Duan says PE is 'a snapshot value.' Real company comparisons make it clear.
Economic Moats: Five Sources of Competitive Advantage
Buffett's favorite metaphor — brand, patents, network effects, switching costs, cost advantage, explained one by one.
Free Cash Flow vs Net Profit: Why Profitable Companies Go Bankrupt
Duan says good companies 'make money lying down, pure cash inflow.' Restaurant owner analogy explains FCF vs net income.