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Learn to read businesses, not tickers
Plain guides to reading businesses the way serious investors do.
Compounder comes out of the value-investing tradition — Graham's margin of safety, Buffett's preference for good businesses at fair prices held for years. We pull superinvestors' 13F filings and valuation into one place and keep it readable, so the judgment stays yours. Everything here is for learning, not investment advice.
About Compounder →What Is a Stock Actually Worth?
Intrinsic value is the one idea underneath all of value investing. What it actually means, why it can't be calculated to a number, and how Graham, Buffett, Li Lu, and Duan Yongping each sharpened it.
LatestWhat Makes a Business High Quality: Reading the Numbers Behind Superinvestor Holdings
How to judge whether a business is any good from a few numbers in its filings: profit margins, free cash flow, and returns on capital, worked through the stocks superinvestors actually own.
Updated 2026-10-19
How to Read a 13F
What a 13F filing is, what it tells you about an investor's portfolio, and what it leaves out. A plain guide to reading one.
Updated 2026-06-07
What Is a Superinvestor?
Where the word comes from, the Graham-to-Buffett value-investing tradition behind it, and what these investors have in common: temperament, patience, and compounding.
Updated 2026-06-07
Reading Cross-Fund Consensus
Which stocks the most superinvestors hold at once — what that overlap tells you, where it misleads, and how to use cross-fund consensus as a starting point rather than a buy signal.
Updated 2026-06-08
Q2 2026: What the Superinvestors Held, Bought, and Sold
A read of the Q2 2026 13F filings from the 97 investors Compounder tracks: the most widely held stocks, the quarter's biggest buys and sells, and why most of the selling was trimming.
Updated 2026-10-19
Q1 2026: What the Superinvestors Held, Bought, and Sold
A read of the Q1 2026 13F filings: the most widely held stocks, the quarter's biggest buys and sells, and why overlap still isn't a signal.
Updated 2026-06-11