SEC Form 13F Explained: Filing Requirements, Insights, and Common Issues

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SEC Form 13F is the quarterly report that institutional investment managers file with the U.S. Securities and Exchange Commission to disclose their holdings of certain U.S.-listed equity securities. A manager must file once it exercises investment discretion over $100 million or more in “Section 13(f) securities.” Each filing is due within 45 days after the end of a calendar quarter and lists the positions held on the last day of that quarter. The data is public, but it is a delayed, partial snapshot, not a live view of a portfolio.

Who must file a 13F

The requirement comes from Section 13(f) of the Securities Exchange Act of 1934, which Congress added in 1975 so the public could see what the country’s largest institutional investors held and to strengthen confidence in U.S. markets. It applies to “institutional investment managers,” a broad category that includes:

• hedge funds and mutual fund advisers
• banks and trust companies
• insurance companies
• pension funds
• broker-dealers and registered investment advisers

Family offices and other entities can also qualify if they exercise investment discretion over enough 13(f) securities.

Investment discretion means the power to decide what to buy or sell for an account. Assets a firm only holds in custody, without the authority to trade them, do not count toward the threshold. The test applies on the last trading day of each month: if the market value of the manager’s 13(f) securities reaches $100 million on any of those dates in a calendar year, the manager must file for the quarter ending December 31 of that year and for each of the next three quarters.

How the filing works

What counts as a 13(f) security

The SEC publishes an Official List of Section 13(f) Securities each quarter. It includes exchange-traded stocks (including ETFs and American Depositary Receipts), shares of closed-end funds, certain equity options and warrants, and certain convertible debt. A security that is not on the list does not belong on the form, even if it is an equity investment.

Form types: 13F-HR, 13F-NT and combination reports

• 13F-HR (holdings report): the manager reports all of its own 13(f) holdings.
• 13F-NT (notice): the manager files only a cover page stating that another manager reports its holdings. This is common where an adviser and its parent or sub-adviser share discretion over the same accounts.
• Combination report: the manager reports some holdings itself and states that the rest appear in another manager’s filing.

A filing marked 13F-HR/A is an amendment. It either restates the earlier report or adds holdings that were left off.

What each row of 13F data contains

The information table lists one row per position. Each row includes:

• the issuer’s name and the title of the class
• the CUSIP number
• the market value at quarter-end
• the number of shares or principal amount
• whether the row is a put or call option
• the type of investment discretion
• the manager’s voting authority (sole, shared or none)

Managers may omit very small positions: those under 10,000 shares and under $200,000 in value. A manager can also request confidential treatment for a position, for example while it is still building a stake. If the SEC grants the request, the holding is disclosed later.

The 2022 amendments

Amendments adopted in 2022 changed the mechanics in three ways. Values are now reported to the nearest dollar instead of in thousands. Confidential treatment requests must be submitted through EDGAR. Filers may also include an optional Financial Instrument Global Identifier (FIGI) alongside the CUSIP.

Worked example: deadlines and reporting lag

Hypothetical manager, for illustration only.

A newly formed adviser holds $90 million in 13(f) securities at the end of January. By the last trading day of June, the same holdings are worth $104 million. Because the threshold was met at a month-end during the year, the adviser’s first 13F covers its positions as of December 31. That report is due 45 days later, in mid-February. After that, a report follows for each subsequent quarter.

The lag works like this. The adviser buys a stock on January 3 and still holds it on March 31. The report for that quarter is due by May 15, which is 45 days after quarter-end. If the adviser files on the last permitted day, the public first sees the purchase 132 days after the trade. If the adviser sold the stock on April 1, the filing still shows it as a holding.

How investors use 13F filings

Many individual investors follow the filings of well-known stock pickers for ideas, and the financial press compares each quarter’s filing with the previous one to report what prominent managers bought and sold. Researchers combine filings across many managers to measure institutional ownership of a stock or to study crowding in popular positions. Companies use the data to identify which institutions own their shares. All filings are free to read on EDGAR.

Limitations of 13F data

Delay

The 45-day window and quarter-end snapshot mean positions can be months old when they appear, and managers that prefer not to tip off competitors have every reason to file near the deadline. In a 2021 letter to the SEC, Americans for Financial Reform asked for more frequent filings covering more types of products. The National Investor Relations Institute has proposed monthly reporting with a 15-day deadline.

An incomplete picture

The form shows long positions and listed options, but not short sales. A fund that earns most of its returns from shorting may hold long positions mainly as hedges, which look identical to conviction buys on the 13F. Cash, most fixed income, many derivatives and non-U.S.-listed shares are also absent, as are returns, fees and leverage. The reported holdings can therefore make a portfolio look more concentrated or more bullish than it really is, and the total value on a 13F is not the same as the firm’s assets under management.

Reliability

In a 2010 internal review, the SEC acknowledged problems with the form. The review recommended changes so the data would be “useful and reliable.” It also found that no SEC division or office regularly or systematically reviewed 13F data. A filing is the manager’s own statement, not an audited record: Bernard Madoff’s firm filed 13F reports while running a Ponzi scheme.

Herd effects

Fund managers borrow ideas from one another, since being wrong alongside peers carries less career risk than being wrong alone. Positions that appear in many filings can therefore become crowded trades. An investor who copies them months after the fact enters late and may also exit late when the trade unwinds.

Threshold debates

In 2020, the SEC proposed raising the filing threshold to $3.5 billion, which would have removed most smaller managers from reporting. After heavy public opposition, the threshold remains $100 million.

Form 13F vs. other ownership disclosures

Schedule 13D applies to any person or group that acquires beneficial ownership of more than 5% of a class of a company’s voting equity securities. It is company-specific and must be filed within a short deadline after crossing the 5% level. It also requires disclosure of the owner’s purpose, such as seeking board seats.

Schedule 13G is a shorter version of the 13D for qualifying passive investors and certain institutions above 5%.

Form 13F is not tied to any single company’s ownership level. It is a periodic list of a manager’s entire book of 13(f) securities, however small each stake is.

Two other filings cover different ground. Form 4 reports trades by corporate insiders such as officers and directors. Form N-PORT covers the full portfolios of registered funds, including securities the 13F omits.

The Bottom Line

Investors who track well-known managers through 13F filings are reading a delayed, partial snapshot that can be months old and leaves out short positions. A filing is the manager's own unaudited statement, so a holding that looks like a conviction buy may be a hedge or may already be sold. Copying crowded positions late can mean entering and exiting a trade after other investors have moved.