To read a 13F filing, start with the cover page to confirm who filed it and for which quarter, then go to the information table, where each row lists a security the fund held, its value in dollars, and the number of shares. Comparing that table with the previous quarter's filing shows you what the fund bought, sold, and held — which is how sites like Wall St. Rank turn raw filings into readable fund portfolios.
This guide walks through each part of a 13F, shows you how to spot the changes that matter, and explains how to put what you find in context.
What is a 13F filing?
Form 13F is the quarterly report through which institutional managers with $100 million or more in U.S. equities disclose their holdings — one of the most useful SEC filings for everyday investors, because it shows what professional money managers actually own rather than what they say. For the full background — who files, the form's variants, and why the disclosures exist — see our complete guide to what a 13F filing is.
The parts of a 13F filing
The cover page
The cover page identifies the institutional manager: its name, address, the reporting period, and the person signing the report. Two details are worth checking here:
- The report type. A "13F Holdings Report" contains all of the manager's reportable positions. A "13F Notice" means the holdings are reported in someone else's filing (common when a parent company files for its subsidiaries). A "13F Combination Report" mixes both.
- Amendments. Managers sometimes file amendments that restate or add to an earlier report. If you see an amendment, read it together with the original — the amendment may only contain the positions that changed.
The information table
The information table is the part most investors care about. Each row is one position, and the key columns are:
- Name of issuer and title of class — the company and the type of security, such as common stock, an ADR, or a call or put option.
- CUSIP — a unique identifier for the security. Useful because company names are often abbreviated inconsistently.
- Value — the market value of the position at the end of the quarter, reported in U.S. dollars.
- Shares or principal amount — the number of shares (SH) or, for convertible debt, the principal amount (PRN).
- Investment discretion and voting authority — whether the manager makes the investment decisions alone or shares them, and whether it can vote the shares.
A single filing can run to thousands of rows. Citadel Advisors, for instance, reports thousands of positions each quarter, while Berkshire Hathaway concentrates most of its equity portfolio in a few dozen names.
How to actually analyze one
A single 13F is a snapshot. The insight comes from comparing snapshots over time:
- New positions — securities in this quarter's table that weren't in the last one. These show where a manager is putting fresh conviction, and aggregated across all funds they drive the ranking of stocks with the most new fund positions.
- Closed positions — securities that disappeared since last quarter.
- Size changes — increases or decreases in share count. A manager adding 50% to an existing position is often a stronger signal than a small new stake.
- Portfolio weight — a position's value as a percentage of the whole portfolio. A $100 million stake means very different things inside a $1 billion fund and a $500 billion one.
Doing this by hand means downloading two quarters of filings from the SEC's EDGAR database and lining up thousands of CUSIPs. Most investors use tools that do the comparison automatically — you can browse every fund's holdings and quarter-over-quarter changes in Wall St. Rank's fund portfolios, see the largest fund trades of the latest quarter, or focus on high-conviction fund trades, where a fund's buying is large relative to its portfolio.
Errors, amendments, and why raw filings bite
Reading filings straight off EDGAR comes with a trap most guides skip: 13Fs are self-reported, unaudited, and routinely contain errors. The classic case is a fund reporting position values in thousands of dollars instead of whole dollars — a mistake that inflates a holding a thousand-fold and can make a modest stake look like the fund's largest bet. Names are abbreviated inconsistently, tickers change mid-quarter, and amendments quietly restate figures you may have already acted on.
If you read raw filings, cross-check anything surprising against the manager's other disclosures and watch for amendments. If you'd rather not, this is precisely the problem Wall St. Rank exists to solve: proprietary validation and anomaly-detection algorithms — refined across more than a decade of filings and over 120 million reported positions — detect and correct these errors before a portfolio reaches the page, and amendments are reflected within seconds of landing on EDGAR. Our methodology describes the pipeline.
Reading a 13F in context
A 13F shows long positions in U.S.-listed securities as of quarter end — no short positions, no cash or bonds, and no record of what the manager paid or when they bought within the quarter. Keep those boundaries in mind when a book looks surprisingly bullish or a position seems to appear from nowhere.
What the boundaries don't do is make the filing stale. The institutions filing 13Fs build positions over quarters and hold them on theses spanning years, so a quarter-end snapshot read a few weeks later still tells you where long-term money is committed. For the honest full accounting of the form's limits — and why each matters less than critics claim — see what 13F filings do (and don't) tell you.
Who files a 13F?
Any institutional investment manager with discretion over $100 million or more in 13(f) securities — hedge funds, asset managers, banks, insurers, and other large institutional investors. The manager files one report covering all the accounts it manages, which is why a filing is best read as the firm's aggregate book; the full breakdown of filer types is in our 13F guide. Note that filings reflect positions, not opinions — they're prepared by the firms themselves, not by the financial analysts who publish research on stocks.
FAQ
When are 13F filings due?
Within 45 days of the end of each calendar quarter — the exact dates, and why most filings arrive in a burst at the deadline, are in our guide to 13F filing deadlines.
Where can I find 13F filings?
All filings are free on the SEC's EDGAR database. For an easier starting point, Wall St. Rank's fund manager index tracks well-known managers, and each fund page — for example Bridgewater Associates or Renaissance Technologies — shows the current portfolio and how it changed each quarter.
Can I copy the trades in a 13F?
Yes — following disclosed portfolios is an established strategy, and it works best with low-turnover managers whose positions are built to be held for years, making the disclosure lag largely irrelevant. Some funds' filings have remained profitable to follow for a decade after publication, as our post-disclosure return outliers ranking shows. The step-by-step approach — picking managers, sizing positions, working the quarterly calendar — is in how to copy trade hedge funds using 13F filings; whatever you copy, evaluate the company yourself before buying.
Do 13Fs include options?
Yes — call and put options on 13(f) securities are reportable, listed with "CALL" or "PUT" in the option type column. The filing reports the value and the number of shares underlying the option, which can make a fund's exposure look larger than the premium it actually paid.
Is a 13F audited or verified?
No — the SEC does not verify the contents of 13F filings, which is why errors persist in the raw data. Wall St. Rank's validation algorithms exist for exactly this reason: suspect positions are detected and corrected before they reach a portfolio page, so surprising holdings you see here have already survived those checks. See our methodology.
