Guide
How to track what hedge funds are buying
Hedge funds and other large institutions must disclose their US stock holdings every quarter in a public SEC filing called a 13F. To track what they are buying, you read those filings, either directly on the SEC EDGAR system or through a tool that aggregates them, and compare fund holdings quarter over quarter to see new positions, adds, trims, and exits. Brief Equity does this for you: search a fund to see its portfolio, follow the managers you care about, and view 13F ownership next to the stocks on your watchlists. One caveat: 13F data is delayed, since filings arrive up to 45 days after a quarter ends, so it shows what funds owned, not what they are trading today.
By The Brief Equity Team · Published
What a 13F filing is
A 13F is a quarterly report that large institutional investment managers must file with the SEC, listing the US-listed stocks they hold. Managers with at least $100 million in covered securities have to file within 45 days of the end of each quarter, which makes 13Fs the main public window into what hedge funds own.
A 13F covers long positions in "Section 13(f) securities": mostly exchange-listed and Nasdaq stocks, plus some equity options, convertible notes, and ADRs. It deliberately leaves a lot out: short positions, cash, most non-US holdings, and stakes below the reporting threshold do not appear, so a 13F is a partial picture of what a fund holds, not the whole book.
Funds file a 13F-HR (the holdings report) each quarter; a 13F-NT is a notice that the holdings are reported by another manager. Managers can also amend a filing (13F-HR/A) or, in narrow cases, request confidential treatment to delay disclosing a position. Build those caveats into how much you read into any single quarter.
Where to read 13F filings
Every 13F is public and free on EDGAR, the SEC filing database: search a manager by name, open its latest 13F-HR, and you will see the holdings table. EDGAR is authoritative but raw, showing one quarter at a time, with no quarter-over-quarter comparison, performance, or position-change context.
On EDGAR you find a manager by name or CIK, open the most recent 13F-HR, and read the information table of holdings: issuer, class, value, and share count. It is the source of record and it is free, which is exactly why most aggregators are built on top of it.
The limitation is that EDGAR shows each filing in isolation. To see what actually changed you would have to pull two quarters and diff them by hand. Aggregators exist to do that diffing, and to make the full filing history of a manager searchable, so the trade-off is authoritative but manual (EDGAR) versus convenient but secondary (a tool).
How to actually track a fund over time
What matters is the change from one quarter to the next. To track what a fund is buying, line up consecutive 13Fs and look for new positions, increased stakes, trims, and exits, plus how concentrated the portfolio is. Doing this by hand across several funds is tedious, so most investors use a tool that computes the deltas.
Read a fund the way you would read a diff: which positions are new this quarter, which were added to or trimmed, which were sold out entirely, and how concentrated the top holdings are. A new position in size from a manager you respect is a more interesting lead for your own research than a long-held stake.
The signal gets stronger when you watch several managers at once and notice the same name showing up across them. Tracking that by hand across a dozen funds and four quarters a year is where the manual approach breaks down, and where a tool that follows funds for you earns its keep.
Tracking 13F ownership in Brief Equity
Brief Equity aggregates 13F filings so you do not parse EDGAR by hand. Search any institution to see its portfolio with quarter-over-quarter activity, follow the funds you want to watch, and open a company to see which institutions hold it. On your watchlists, an ownership lens shows how the institutional money moved for the stocks you already track.
The ownership view does that diffing for you: a manager portfolio with the buys, sells, and concentration for the quarter; the top institutional holders of a company; and a watchlist view of how ownership shifted for the tickers you follow. Follow the funds whose moves you care about and their new quarterly activity surfaces for you.
Two honest limits: the data is 13F data, so it is delayed up to 45 days and US-focused, and it reflects what funds owned at quarter close rather than what they are doing now. It is built for research and idea generation off the institutional money, not for trading on it.
“Every Manager which exercises investment discretion with respect to accounts holding Section 13(f) securities ... having an aggregate fair market value ... of at least $100,000,000 shall file a report on Form 13F with the Commission within 45 days after the last day of ... each of the first three calendar quarters.”
Frequently asked questions
- Are 13F filings free?
- Yes. Every 13F is filed with the SEC and is public and free to read on EDGAR. Tools that aggregate and track filings across quarters may charge, but the underlying filings cost nothing.
- How often do hedge funds report their holdings?
- Once per quarter. Managers above the $100 million threshold file Form 13F within 45 days of the end of each calendar quarter, so there are four filings a year.
- Do 13F filings show what a fund is buying right now?
- No. 13Fs are delayed: they arrive up to 45 days after a quarter ends and reflect positions as of the close of that quarter. They show what a fund owned, not what it is trading today, and they exclude short positions, cash, and most non-US holdings.
- Can I follow specific investors?
- Yes. In Brief Equity you can search an institution, view its portfolio, and follow the managers whose moves you want to track; new quarterly activity then surfaces for the funds you follow.
Brief Equity is built by investors, for investors. For research, not investment advice; market data is delayed. Figures and rules reflect public information at the time of writing and can change. Verify anything time-sensitive at the linked primary source.