What is a 13F filing? Fund holdings explained (2026)
Every few months you see the headlines: "Warren Buffett just bought this stock," "Michael Burry is betting against the market." They all come from the same place, a filing called a 13F.
Here is what a 13F actually is, what it does and does not tell you, and the one field that makes people read it completely backwards.
What is a 13F filing?
A 13F is a quarterly report in which a large investment manager lists the US stocks it holds. The SEC requires it so the public can see what the biggest players in the market are doing with their money, since those players are large enough to move stocks and their trades are of public interest.
The rule comes from Section 13(f) of the Securities Exchange Act, and the SEC's own 13F FAQ plus the investor.gov glossary entry are the primary sources if you want the letter of it. The short of it: cross a size threshold, and your holdings stop being private.
It is the raw material behind every "what is the smart money buying" story, and behind tools that track famous investors.
Who has to file a 13F?
Any institutional investment manager holding at least $100 million in US-listed securities. That sweeps in hedge funds, mutual funds, pensions, endowments, and family offices, which is why both Warren Buffett's Berkshire Hathaway and Michael Burry's Scion file one.
Who does not file: you and me, funds under the $100 million line, and anyone whose money sits in bonds, cash, or foreign-listed stocks. The threshold is the whole point, it is what makes a 13F a signal about serious money rather than everyone's brokerage account.
How often are 13Fs filed, and when?
Once a quarter, with a 45-day deadline after the quarter closes. So the March-quarter filings arrive by mid-May, the June quarter by mid-August, and so on. Four snapshots a year, each landing about six weeks late.
That lag matters more than anything. A 13F tells you where a fund stood at the end of last quarter, disclosed weeks later. By the time you read it, the fund may have already changed its mind. It is useful for finding ideas, not for copying trades in real time.
What does a 13F NOT show?
This is where most people overrate it. A 13F only lists long positions in US-listed securities. Everything else is invisible: short positions, cash, bonds, foreign stocks, and any holding too small to report. A fund can look sleepy on its 13F and be doing plenty you will never see.
The classic trap is a manager famous for short-selling. Their 13F might look almost empty, because the shorts that make their name do not appear on it at all. What you see is one corner of the strategy, not the strategy.
Why is a raw 13F so hard to read?
Because it was built for machines, not people. Open one on EDGAR and you get a wall of nine-digit CUSIP codes instead of company names, no total, and no comparison to last quarter. Working out that "037833100" is Apple, and that the fund trimmed it, is manual work you do row by row.
There is also an aggregation catch: one stock can appear as several rows, because a fund splits a position across sub-managers. Berkshire lists some holdings five times over. Count the rows and your totals are wrong; you have to add them up by CUSIP first.
What is the 13F put trap?
A 13F lists option positions the same way it lists stock, and it does not tell you the direction of the bet in plain English. A put is a wager that a stock falls. So a "position" on a 13F can actually be a bet against that company, and if you skip the put/call flag, you read it exactly backwards.
This is exactly why the "Michael Burry is loading up on Nvidia" headlines have been wrong more than once, his position was a put, a bet the stock would drop. The flag is right there in the filing; the headlines just ignored it. Any serious read of a 13F checks it.
How do you actually use 13F filings?
You use them for ideas, not orders. A 13F can show you what a fund manager you respect was building, which stocks a wave of smart money crowded into, or what a famous investor quietly sold. Then you do your own work, because the data is six weeks old and only half the picture.
Every 13F is free on SEC EDGAR, so you can always read one raw. To skip the CUSIP decoding and the quarter-over-quarter math, the free Superinvestors tracker shows any fund's latest 13F with real company names, position sizes, what they bought and sold, and puts flagged as bearish. If you build software, the 13F API guide returns the same data as clean JSON.
Once you know what a 13F is and is not, the headlines stop pushing you around. You will see "the smart money is buying" for what it is: a lagged, partial, US-only snapshot that is a starting point, never a signal to act. The sister explainers on Form 4, the 10-K, and the 8-K cover the other filings the same way.
See any investor's 13F holdings free →
Edgrapi surfaces public SEC filings for research. It is not investment advice, and 13F holdings do not predict future returns.
Frequently asked questions
What is a 13F filing?
A 13F is a quarterly report that large investment managers file with the SEC listing the US stocks they hold. Any manager with $100 million or more in US-listed securities must file one within 45 days of the quarter's end. It is how the public learns what funds like Berkshire, Scion, or Citadel are holding, straight from a required public disclosure.
Who has to file a 13F?
Any institutional investment manager with at least $100 million in US-listed securities under management. That covers hedge funds, mutual funds, pensions, endowments, and family offices, so Warren Buffett's Berkshire and Michael Burry's Scion both file. Retail investors and funds under $100 million do not, which is why a 13F is a big-money signal.
How often are 13Fs filed?
Once a quarter, four times a year. The deadline is 45 days after the quarter ends, so the Q1 (March) filings land by mid-May, Q2 by mid-August, and so on. That 45-day gap is why a 13F is a lagged snapshot: you are seeing where a fund stood weeks ago, not where it stands today.
What does a 13F not show?
A lot. A 13F only lists long positions in US-listed securities. It hides short positions (bets against a stock), cash, bonds, foreign-listed stocks, and anything below the reporting line. So a fund can look quiet on its 13F while doing plenty you cannot see, which is the biggest reason not to read too much into one.
Why do 13F filings show puts as holdings?
Because a 13F lists option positions the same way it lists stock, without spelling out the bet. A put is a wager that a stock falls, so it shows up as a 'position' even though it is bearish. This is why Michael Burry's headline 'stakes' are often puts, not longs, and why you have to read the put/call flag before assuming a fund is bullish.
Where can I see what investors hold from their 13F?
Every 13F is public on SEC EDGAR the moment it is filed, but the raw filing lists CUSIP codes instead of company names with no comparison to last quarter. A tool that parses it for you is far easier. Edgrapi's free Superinvestors tracker at edgrapi.com/superinvestors shows any fund's holdings with real names and what they bought and sold.