InsiderFlow › Guides › How to Read a 13F Filing, Step by Step
Every quarter, big US funds disclose their holdings to the SEC. Knowing how to read them means seeing smart money's cards — if you avoid the interpretation traps.
On the SEC's EDGAR database, searching the fund's name. They're free but unfriendly: tables of tickers, CUSIPs and nominal values. Tools like InsiderFlow make them readable and explain them.
New positions and complete exits say more than marginal adjustments. Weight matters too: a stock at 10% of the portfolio is a conviction, one at 0.1% is noise. And compare multiple quarters: progressive accumulation is the strongest signal.
1) Forgetting the delay: data is up to 45 days old — the fund may have already sold. 2) Ignoring shorts: the 13F shows only long positions — a stock can be one leg of a complex strategy. 3) Copying quant funds like Citadel, whose thousands of positions reflect no "convictions". 4) Ignoring fund size relative to the stock. 5) Buying without your own thesis: a 13F is a research starting point, not an automatic signal.
Concentrated, low-turnover portfolios are the most informative: Berkshire Hathaway, Pershing Square, Greenlight. Their positions last years, making the 45-day delay almost irrelevant.