What Is a 13F Filing and How Should Investors Read One
Every quarter, the same headlines reappear. A famous manager bought a position, trimmed another, exited a third. The source under almost all of those headlines is one document: Form 13F. A 13F filing is a quarterly disclosure that institutional managers with at least $100M in 13(f)-eligible US securities must submit to the SEC within 45 days of quarter-end. It is useful, it is widely cited, and it is also routinely misread.
Key facts at a glance
- A 13F filing is required for institutional investment managers that exercise discretion over at least $100M in 13(f)-eligible US securities, per SEC Form 13F FAQ.
- Filings are due 45 days after the end of each calendar quarter.
- The form reports long positions in 13(f) securities only. Short positions, most cash, and most non-US holdings are not reported.
- Managers may request confidential treatment for certain positions, which can delay public disclosure.
- 13F filings are filed via EDGAR and are publicly searchable from SEC EDGAR.
What a 13F filing actually shows
A 13F filing is a list of US-listed long positions, by issuer and class, with share counts and quarter-end market value. That is it. The filing is a snapshot of one moment, the last business day of the quarter, filed up to 45 days later. By the time the public sees it, the manager has had over six weeks to change positions further.
The columns most readers care about look like this:
| Field | What it shows |
|---|---|
| Issuer name | Company whose securities are held |
| CUSIP | Security identifier |
| Value ($000) | Quarter-end market value, in thousands |
| Shares or principal | Position size at quarter-end |
| Investment discretion | Sole, shared, or none |
| Voting authority | Sole, shared, or none |
The dollar values are quarter-end mark-to-market, not cost basis. A position that doubled in value during the quarter looks twice as large in the 13F even if the manager did not add a single share.
Who has to file
The rule applies to any institutional investment manager with investment discretion over at least $100M in 13(f) securities on the last trading day of any month in the prior calendar year, per the SEC FAQ on Form 13F. This pulls in hedge funds, mutual funds, registered investment advisers, banks, insurance companies, and pension plans. It does not pull in individuals managing personal accounts, no matter how large.
What a 13F filing does not tell you
This is the section most readers skip and most journalists overlook.
- No short positions. A manager that is net short a stock can show a long position in the 13F because only the long leg is reported. The headline “Famous manager loads up on XYZ” can sit on top of a net-short book.
- No cash, no Treasuries, no most-bond positions. A manager who moved 30% of the book to cash this quarter will not show that change in a 13F.
- No non-US listings. Positions in foreign-listed companies are largely absent. A global fund’s US-only slice can be a small fraction of its real book.
- No derivatives in their full economic sense. Options are reported, but the filing does not show the strike, expiry, or how the option hedges another position.
- No timing. Did the manager buy the position on day one of the quarter, or in the last week? The 13F does not say.
- Confidential treatment requests. A position can be temporarily redacted from public view if the manager argues that disclosure would harm an ongoing program of acquisition or disposition.
Why this matters
A 13F filing is a useful starting point for studying how large managers position over time, especially across consecutive quarters. It is not a real-time portfolio. It is also not a recommendation, even when the filer is famous. Reading a 13F as if it were a buy list is the most common error in this corner of the market.
How to read a 13F filing without overreaching
A useful reading routine looks like this:
- Start with the cover page. Note the manager, the quarter, and any confidential-treatment language.
- Sort positions by value at quarter-end. Look at the top ten by weight.
- Compare the current 13F to the prior quarter’s 13F from the same manager. New positions, exits, and notable size changes are where the signal lives.
- Check whether the manager’s stated strategy can be inferred from longs alone. If the strategy is long-short, the 13F is half a book at most.
- Cross-check with company-level disclosures (Schedule 13D, 13G, Form 4) for the same names when activist or insider angles matter.
15 popular 13F filers to track at the end of 2025
A note before the list. Members of Congress do not file Form 13F. Congressional trades surface in Periodic Transaction Reports under the STOCK Act, not in 13F filings. The “Pelosi tracker” style sites are reading PTRs, a separate disclosure regime. The list below is restricted to actual 13F filers.
These 15 cluster into three groups by style. The strategy descriptions are short editorial summaries, not investment guidance.
Value and concentrated classics
| Filer | Lead manager | Known for |
|---|---|---|
| Berkshire Hathaway | Warren Buffett | Long-duration concentrated positions in financials, energy, consumer staples |
| Pershing Square Capital | Bill Ackman | Activist concentrated bets in US large caps |
| Greenlight Capital | David Einhorn | Long-short value with frequent named public theses |
| Appaloosa Management | David Tepper | Macro-driven equity and credit |
| Scion Asset Management | Michael Burry | Contrarian deep value, often adjacent to short theses |
Tiger cubs and growth-thesis funds
| Filer | Lead manager | Known for |
|---|---|---|
| Tiger Global Management | Chase Coleman | Public equity plus late-stage growth, technology-heavy |
| Coatue Management | Philippe Laffont | Technology long-short with AI-infrastructure exposure |
| Lone Pine Capital | Stephen Mandel | Long-short growth across software and consumer |
| Viking Global Investors | Andreas Halvorsen | Long-short global equities |
| Whale Rock Capital | Alex Sacerdote | Concentrated technology and AI positions |
Quant and multi-strategy megafunds
| Filer | Lead manager | Known for |
|---|---|---|
| Renaissance Technologies | Founded by Jim Simons | Systematic quant; the public 13F covers RIEF, not the internal Medallion fund |
| Citadel Advisors | Ken Griffin | Multi-strategy investment plus market-making |
| Millennium Management | Israel Englander | Multi-manager pod-shop structure |
| Point72 Asset Management | Steven Cohen | Multi-strategy long-short |
| Two Sigma Investments | David Siegel and John Overdeck | Systematic data-driven quant |
All 15 file Form 13F-HR every quarter. Each filer’s history is searchable on SEC EDGAR by manager name or CIK number. The most useful comparison is two consecutive quarters from the same filer, read against that filer’s stated investment strategy.
FAQ
How often are 13F filings released?
Quarterly. They are due 45 days after the end of each calendar quarter, per the SEC FAQ.
Are 13F filings audited?
No. The SEC reviews filings but does not certify them as audited. Errors and amendments do happen.
Can a manager hide positions?
A manager may request confidential treatment for a position. If granted, the position is omitted from the public filing until the request expires or is withdrawn.
Do 13F filings include short positions?
No. Form 13F reports long positions in 13(f) securities only.
Are 13F filings a good source for retail investors?
They are a good source for understanding what large managers held at one moment. They are a poor source for real-time portfolio construction.
Disclaimer. This article is analytical commentary on a public SEC disclosure framework. It is not investment advice and should not be acted on as a single input to a portfolio decision.
Past positioning by any investor is not a reliable indicator of future returns. Read a 13F filing as one signal among many.
