A 13F filing is a quarterly report that the U.S. Securities and Exchange Commission (SEC) requires from institutional investment managers with at least $100 million in qualifying U.S. equities, disclosing every reportable stock position they held at the end of the quarter. Because the filings are public, anyone can see what the world's largest investors own — which is exactly what Wall St. Rank turns into browsable fund portfolios.
This guide explains who has to file a 13F, what the form contains, and how a document written for regulators became one of the most useful research tools available to individual investors.
Who has to file a 13F?
The SEC requires Form 13F from every "institutional investment manager" that exercises investment discretion over $100 million or more in 13(f) securities — mostly U.S. exchange-listed stocks and ETFs, plus certain options and convertible notes. The threshold is measured in assets under management of those qualifying securities, so a firm crosses into 13F territory as it grows.
That definition captures most of the professional money management industry: hedge funds, mutual fund companies, pension funds, insurance companies, bank trust departments, sovereign wealth funds, and registered investment advisers — in short, the large institutional investors that account for the majority of U.S. trading volume. An asset manager files one 13F covering all the accounts it manages, so each filing is best read as a firm's aggregate book rather than a single fund's portfolio.
What's inside a 13F filing
A 13F has two parts. The cover page identifies the manager — name, address, reporting period, and the person signing the report. The information table is the payload: one row per position, listing the issuer's name, the class of security, its CUSIP identifier, the market value of the position at quarter end, and the number of shares held.
Filings vary enormously in size. Berkshire Hathaway concentrates most of its equity book in a few dozen names, while the largest asset managers report thousands of rows every quarter. If you want to work through a filing column by column — and learn to spot the quarter-over-quarter changes that matter — see our guide on how to read a 13F filing. The SEC's own investor education page on Form 13F covers the regulatory fine print.
13F-HR, 13F-NT, and amendments
Not every 13F looks the same. A 13F-HR (holdings report) contains the manager's full list of reportable positions. A 13F-NT (notice) means the holdings are reported in someone else's filing — common when a parent company files on behalf of its subsidiaries. A combination report mixes both.
Managers also file amendments that restate or add to an earlier report, and they are more common than most investors realize. An amendment may replace the original filing entirely or contain only the positions that changed, which makes reading one in isolation risky. When an amendment lands on EDGAR, Wall St. Rank's pipeline reflects it within seconds, so the portfolio you see always incorporates a manager's latest corrections — see our methodology for how filings are processed.
When are 13F filings due?
Managers must file within 45 days of the end of each calendar quarter, which puts the deadlines in mid-February, mid-May, mid-August, and mid-November. Most large managers file at or near the deadline, so new portfolio data arrives in waves four times a year. For the exact dates and what to expect around each one, see our guide to 13F filing deadlines.
Why 13F filings matter to individual investors
The institutions that file 13Fs manage portfolios in the billions of dollars. Positions of that size are built and unwound over quarters, not days, on investment theses that often span years — which is why a quarterly snapshot remains a meaningful read on how the world's most sophisticated investors are positioned, even though the filing arrives weeks after quarter end.
Behind each filing sits research most individuals could never buy: teams of financial analysts, alternative data, and management access, funded by billions of dollars in annual research spending across the industry. A 13F is the closest thing to seeing that research translated into actual money at work. And the track record is measurable — some managers' disclosed portfolios have kept outperforming for years after their filings became public, which you can explore in our ranking of post-disclosure return outliers.
For the full argument — from idea generation to portfolio checkups — see why track 13F filings.
What a 13F won't show you
A 13F reports long positions in U.S.-listed securities as of quarter end. It does not include short positions, cash, most bonds, or foreign-listed holdings, and it shows quarter-end values rather than purchase prices. None of that undermines the value of what it does show, but it pays to know the boundaries — we walk through each one, and how much it actually matters, in what 13F filings do (and don't) tell you.
There is also a subtler problem: filings are self-reported, and they routinely contain errors — a classic example is a fund reporting position values in thousands of dollars instead of whole dollars, inflating a holding a thousand-fold. Wall St. Rank runs proprietary validation and anomaly-detection algorithms, refined across more than a decade of filing data, that detect and correct these and many other classes of filing errors before they ever reach a page. The specifics of those checks are part of what makes the data reliable, so we don't publish them — but their output is in every portfolio on this site. Our methodology explains the approach.
How investors use 13F data
Three patterns cover most of it:
- Follow individual managers. Watch what a Buffett or a Bridgewater actually bought and sold each quarter, and use their moves as a source of researched ideas — or go further and copy trade the managers you admire.
- Read the consensus. Any single filing is one firm's opinion. Aggregated across thousands of filings, 13F data shows what the majority of institutional money is trending toward — the stocks funds most commonly hold and are collectively buying. That crowd-level view is what we mean by following the smart money, and it's browsable directly in stocks ranked by fund ownership and the quarter's largest fund trades.
- Check a single stock. Before buying — or while holding — see whether institutions are accumulating or backing away from a company by looking at its institutional ownership.
Where to find 13F filings
Every 13F is free on the SEC's EDGAR database. Working with them there, however, means downloading raw XML, reconciling CUSIPs across quarters, chasing amendments, and repeating it all for every manager you follow.
Wall St. Rank does that work continuously: hundreds of thousands of 13F filings from more than 13,000 institutional managers — over 120 million reported positions, with history back to 2013 — parsed, corrected, and resolved across ticker changes, splits, and other corporate actions. The result is a clean quarterly portfolio for every manager, from Berkshire Hathaway down to funds you've never heard of, plus the Wall St. Rank Fund Manager Index, which distills the most commonly held stocks across managers into a single list.
FAQ
Are 13F filings public?
Yes. Every 13F is published on the SEC's EDGAR system and can be read by anyone, free of charge. The 45-day filing window is the only delay between a quarter ending and its holdings becoming public.
What's the difference between 13F, 13D, and 13G?
A 13F is a quarterly report of a manager's whole U.S. equity book. Schedules 13D and 13G are event-driven: they're filed when an investor acquires more than 5% of a single company's shares, with 13D signaling activist intent and 13G a passive stake. A 13F shows breadth; 13D/13G show concentration in one name.
Do 13F filings show short positions?
No. 13Fs cover long positions in 13(f) securities only, so a fund that relies heavily on short selling may look more bullish on paper than it is in practice. Put options — which are reportable — are the closest visible proxy for bearish positioning.
Can I see a fund's older 13F filings?
Yes. EDGAR archives every filing, and Wall St. Rank keeps processed portfolio history back to 2013 — open any fund page, such as Bridgewater Associates, and step back through its quarters to watch positions get built and unwound.
Go deeper on 13F filings
- How to read a 13F filing — the cover page and holdings table, column by column.
- Why track 13F filings? — the case for following institutional disclosures.
- How to copy trade hedge funds — turning filings into a portfolio.
- What are SEC filings? — where the 13F fits among 10-Ks, 10-Qs, and the rest.
- The quarterly hedge fund trends report — what the latest round of filings showed.
