What Is a 13F Filing, and When Is the Next Deadline?

The short answer. A 13F is a quarterly report that every institutional investment manager with over $100 million in US-listed equities must file with the SEC, listing their long positions as at the quarter end. It is due 45 days after the quarter closes. The next deadline is 14 August 2026, covering Q2 2026. We currently read 154 filed books.

Almost everything the public knows about what famous investors own comes from this one document, four times a year. There is no other disclosure — no monthly update, no running total, nothing in between.

When are the 13F deadlines?

The deadline is 45 calendar days after quarter end, moving to the next business day when it falls on a weekend or holiday. Most large filers submit in the final 48 hours, which is why the data appears in a burst rather than a trickle.

What is actually in a 13F, and what is missing?

The omissions matter more than the contents for interpretation. A fund appearing to make a huge bullish bet may be hedging something the filing cannot show. Berkshire Hathaway's 13F, to take the most-read filing in the world, excludes every operating business it owns outright — the railway, the insurers, the utilities — which is most of the company.

Why is the data 45 days old before you see it?

Because the SEC set the deadline that way, and managers use it. A position shown as opened in a Q2 filing published in mid-August could have been bought on 1 April and sold on 1 July. The filing would still show it, at its 30 June value, and give no hint that it is gone.

This is the single most important thing to understand before using 13F data: it is a record of where a portfolio stood on one day in the past, published a month and a half later.

What this cannot tell you

Nothing about performance. A 13F has no cost basis and no timing, so any "return" attributed to a famous investor from their filings is reconstructed with assumptions and is not their actual result.

Educational information, not financial advice. Every figure on this page is read from the source filings when the page loads rather than written into the article, so what you are reading is today's data and not a snapshot of the day it was published.