What is a 13F filing and how do you follow Warren Buffett?

Updated November 15, 2026 · examples use today’s data

Every institutional manager with more than $100 million in US stocks must file a Form 13F with the SEC each quarter, listing its stock holdings. That is how anyone can see what Berkshire Hathaway, Bill Ackman or BlackRock owns.

What a 13F shows

Long positions in US-listed stocks and some options at the end of each quarter: the company, the number of shares and their value.

What it does not show

Short positions, most foreign stocks, cash and bonds are missing, and the filing is due up to 45 days after the quarter ends, so the portfolio may have changed since. Treat a 13F as a list of ideas, not a signal to copy.

How to use it

Look for what several respected investors own at once, which positions are new and which were sold completely. Then do your own analysis: you do not know their price, timing or reason.

Frequently asked questions

When are 13F filings published?

Within 45 days after each quarter: mid-February, mid-May, mid-August and mid-November.

Can I see big asset managers too?

Yes. Our super investors page has an Institutions filter with Vanguard, BlackRock, State Street, Fidelity and others.

Tools for this

Super investors Stock lists

Keep learning

What is the P/E ratio and how do you use it?What is earnings per share (EPS)?What does TTM (trailing twelve months) mean?What is an ETF and how is it different from a stock?What is a dividend and what is dividend yield?What is compound interest and why does it matter so much?

Educational content, not investment advice. Figures in the examples come from company filings and market prices and update automatically.