A 13F Filing, or Form 13F, is the quarterly report big investment managers must file with the SEC, listing the US-traded securities they manage. It is the closest thing there is to a public look inside portfolios like Berkshire Hathaway, with real limits worth understanding before you read anything into one.
The 13F filing is essential for understanding how institutional investors allocate their capital. By reviewing multiple filings, you can identify trends in asset management and investment strategies.
Key takeaways
- The filing trigger is $100 million or more in Section 13(f) securities, an official SEC list, not simply “US stocks”.
- 13Fs are due 45 days after each quarter end, rolling to the next business day when day 45 falls on a weekend or federal holiday.
- They show long positions only. Short bets, cash, most bonds, private stakes and non-US holdings are invisible.
- Every 13F is stale by design, a quarter-end snapshot published up to 45 days later.
- The information is in the differences between quarters, not in any single snapshot.
Table of Contents
What a 13F shows — and what it hides
| In the filing | Invisible to a 13F |
|---|---|
| US-listed stocks and ETFs | Short positions |
| Certain convertible bonds | Most bonds and all cash |
| Exchange-listed options (puts and calls) | Private company stakes |
| Position size at quarter end | Non-US-listed holdings |
| Value at quarter end | Trades made inside the quarter |
Investors analyze 13F filings to assess the health of various sectors, where a comprehensive understanding of the filings may lead to profitable investments and sharpen sharpen your competitive edge. The filing rules clarify how and when these reports must be submitted.
The practical consequence is; a 13F tells you what a manager held, weeks ago, on one side of their book. It cannot tell you what they hold right now, today, why they held it, or whether an offsetting hedge existed. That is why our fund profiles print the quarter-end date and the filing date on every figure instead of implying a live portfolio.
The rule, in the SEC’s own words
“Form 13F is the reporting form filed by institutional investment managers pursuant to Section 13(f) of the Securities Exchange Act of 1934.”
SEC, Form 13F FAQ
The trigger is precise: managers that exercise investment discretion over $100 million or more in Section 13(f) securities must file. “Section 13(f) securities” is an official list the SEC republishes every quarter which is mostly US exchange-traded stocks and ETFs, plus certain convertible bonds and exchange-listed options.
Two common shorthands are wrong enough to matter. It is not “every fund managing over $100 million in US stocks” — the threshold counts only securities on the 13(f) list. And “13Fs exclude cash and bonds” is over-broad: certain convertible debt and ETFs are squarely in scope.
Each 13F filing is a crucial tool for tracking institutional investment trends.
When must Form 13F be filed?
A 13F form is due within 45 days of the end of each calendar quarter. When day 45 lands on a weekend or a federal holiday, the deadline rolls forward to the next business day, which is why the published dates are not simply “quarter end plus 45”.
Filing a 13F form is crucial for big investment firms to comply with SEC regulations.
Most large managers file in the final days of the window rather than early, so the bulk of a quarter’s filings arrive in a cluster over the last 48 hours. The current quarter’s deadline, computed from that rule, sits at the top of our Big investors page.
The 13F Filings Form
The filings form 13F itself is simple, it asks for these 8 different things:
- Name of Issuer for each security listed
- Title of Class of the reported security
- CUSIP Number and Share Class level Financial Instrument Global Identifier (FIGI)
- Market Value of the asset
- Amount and Type of security
- Investment Discretions (Sole, Shared-Defined, Shared-Other)
- Other Managers (those who share investment discretion)
- Voting Authority
What Are 13(F) Securities?
The SEC lists 13(f) securities as being classified under Rule 13f-1(c), which are equity securities that trade on a “national securities exchange or quoted on the automated quotation system of a registered securities association,” according to Cornell Law School’s definition. The official document of reference from the SEC which these firms use, defines 748 pages worth of equity securities that fall under this law.
How to read one without fooling yourself
- Check the two dates first. Holdings are as of quarter end; the filing lands up to 45 days later. Both matter, and they are not the same date.
- Compare quarters, not snapshots. The information is in the diffs — new positions, exits, big adds and trims.
- Watch for amendments. A quarter’s numbers can change after the deadline when a manager restates or adds holdings.
- Mind the split artifacts. A share count that quadruples while value holds steady is usually a stock split, not a conviction buy.
- A missing filing is information too. Managers can stop filing — they fall under the threshold, deregister, or wind down. We flag managers whose latest filing trails the newest quarter rather than silently showing an old portfolio.
Understanding the timeline of 13F filings is vital for accurate assessments. Investors often look at the 13F filings to gauge the strategies of successful funds, and analysts use them to track changes in institutional ownership of stocks.
Frequently Asked Questions
Who has to file a 13F?
Institutional investment managers that exercise investment discretion over $100 million or more in Section 13(f) securities — a specific SEC-published list of US-traded stocks, ETFs, certain convertible bonds and exchange-listed options. It is not simply “every fund managing over $100 million”.
When are 13F filings due?
Within 45 days after the end of each calendar quarter. When day 45 lands on a weekend or federal holiday, the deadline rolls to the next business day. Most big managers file in the final days of the window.
Do 13F filings show short positions?
No. 13Fs report long positions in Section 13(f) securities, plus certain exchange-listed options. Short bets, bonds outside the 13(f) list, cash, private stakes and non-US holdings are all invisible.
How current is 13F data?
Always at least somewhat stale: holdings are a snapshot at quarter end, published up to 45 days later. By the time a filing is public, the manager may have traded in and out of positions. Every tracker works from the same lag — we print it on every figure.
What is a 13F amendment (13F-HR/A)?
A correction or addition to an already-filed report. A restatement replaces the original in full; a new-holdings amendment adds positions omitted from it. We always show the latest canonical version of each quarter.
Does a 13F tell me what a fund is buying right now?
No. It tells you what the fund held on the last day of a quarter that ended weeks earlier. Treat it as a record of past positioning, not a signal about today.
See it in the data
We parse every 13F from SEC EDGAR and compute the quarter-on-quarter differences. Big investors carries a profile per manager, holdings, new positions, exits, adds and trims, each stamped with its quarter-end and filing dates. The moves board ranks the largest buys and sells across all the managers we track.
Facts on this page are verified against the SEC’s own Form 13F FAQ (page-dated 6 March 2026) and SEC EDGAR filings.
The data extracted from 13F filings can help predict future market trends, where each provides a glimpse into the investment landscape, and monitoring them regularly can enhance your market understanding.
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