What is a 13F filing?

Updated Oct 22, 2026

Form 13F is a quarterly report that institutional investment managers with at least $100 million in qualifying US securities file with the SEC. It lists their long positions in US-listed stocks, ETFs, convertible bonds and listed options at the end of each calendar quarter.

Who has to file?

Any institutional investment manager, such as a hedge fund, mutual fund company, bank, insurer, pension fund or family office, that exercises investment discretion over at least $100 million of "13(f) securities" on the last trading day of any month in a year. Once over the threshold, it files for every quarter of the following year. About 9,000 managers file each quarter.

When is it due?

45 days after the quarter ends. When that day falls on a weekend or a federal holiday, the deadline moves to the next business day. Amendments can follow later, either restating the whole report or adding holdings that were filed late or kept confidential. See the 13F filing deadlines for every quarter.

What it does not show

A 13F shows long positions only: no short positions, no cash, no bonds other than convertibles, and no non-US listings. Values are as of the last day of the quarter, so a 13F is a snapshot, not a record of trades. The total is the 13F reported value, not a manager's assets under management.

How to read a 13F portfolio

• Weights. Each position's share of the 13F reported value shows how concentrated the manager is. A 20% position says more about conviction than a 0.1% one.
• Changes. Comparing share counts with the previous quarter shows new positions, additions, reductions and exits. The trades happened at some point during the quarter, not on its last day.
• Timing. Filings arrive up to 45 days after the quarter ends, so a 13F can be up to four and a half months old for a position bought early in the quarter.
• Options. Calls and puts are reported at the value of the underlying shares, not at the option's price. 13F Holding lists them separately.

13F filing deadlines

Next deadline: Nov 16, 2026 for Q3 2026 holdings (quarter ended Sep 30, 2026).

A 13F is due 45 days after the end of each calendar quarter. When the 45th day is a Saturday, Sunday or US federal holiday, the deadline moves to the next business day. Most large managers file in the last week before the deadline.

When is the next 13F deadline?

The 13F for Q3 2026 (quarter ending Sep 30, 2026) is due Nov 16, 2026.

How is the 13F deadline calculated?

45 calendar days after the end of the calendar quarter. If that day is a Saturday, Sunday or US federal holiday, the deadline is the next business day.

Can a 13F be filed late or amended?

Yes. Managers file amendments to restate a report or to add holdings that were filed late or kept confidential, sometimes months after the deadline.

13F vs 13D vs 13G

All three are SEC filings that reveal what investors own, but they answer different questions. A 13F shows a manager's whole long portfolio once a quarter. Schedules 13D and 13G are about one company: they are filed when an investor's stake in it passes 5%.

Form 13F

Filed quarterly by institutional investment managers with at least $100 million in 13(f) securities. It is the only one of the three that shows a whole portfolio, which is why sites like this one are built on it. Its limits: long positions only, a snapshot at quarter end, and up to 45 days of delay. See what is a 13F filing at the top of this page.

Schedule 13D

Filed by an investor, or a group acting together, that acquires beneficial ownership of more than 5% of a class of a public company's voting shares and may seek to influence or control it. It must state the purpose of the purchase and any plans for the company, which is why activist campaigns start with a 13D. The deadline is a few business days after crossing 5%, with amendments after any material change.

Schedule 13G

A shorter form for investors above 5% who are not seeking control: passive investors, and qualified institutions such as banks, broker-dealers and registered advisers investing in the ordinary course of business. Qualified institutions may file later, after the quarter in which they crossed 5%. An investor who later decides to push for change must switch to a 13D.

Which one to read?

• To see everything a fund owns and how it changed: 13F.
• To catch an activist building a stake, and what it wants: 13D.
• To see who holds more than 5% of a company passively: 13G.

How 13F Holding builds its pages

Source data

• Holdings come from the SEC's Form 13F data sets and filings on EDGAR. Each manager-quarter uses its latest original or restated filing, plus later "new holdings" amendments.
• Every published quarter is audited against the SEC data before it goes live.

Corrections

• Filings that reported values in thousands instead of dollars (or mixed both) are corrected line by line against the price every other filer reported.
• Changes between quarters are adjusted for stock splits inferred from the filings, and are left blank when there is no comparable earlier filing (a first filing, or a quarter whose holdings were withheld under confidential treatment).
• Tickers come from the CUSIP each filer reports, matched with OpenFIGI and the SEC's ticker list.

What the numbers mean

• 13F reported value is the value of a manager's stocks and funds in its 13F at quarter end. It is not assets under management. Bonds, preferreds, convertibles and warrants are listed separately.
• Options are reported at the value of the underlying shares and are shown apart from the holdings they relate to.
• Average price on a stock page is the total 13F value divided by the total shares all holders reported, a rough quarter-end price.

Famous investors

The famous investors are well-known stock pickers, activists, hedge fund founders and the largest quant and macro firms whose filings are followed most, chosen from the popular-manager lists of other 13F trackers, media coverage and investor interest. Every other filer has the same pages and is listed in the All Funds directory. Their photos and logos are listed, with authors and licenses, in the image credits.

Quarters still being filed

• A manager's page shows its new filing as soon as it is filed and checked: one manager's filing is complete once it is in.
• Totals across managers (holder counts, most bought and sold) change until the filing season ends. A quarter counts as complete once its deadline has passed and managers holding at least 95% of the previous quarter's 13F value have filed, or seven days after the deadline. Until then its stock pages and rankings carry a "still being filed" notice, and the main stock pages keep showing the last complete quarter.

This site is for information only and is not investment advice.