Form 13F Explained: What Institutional Holdings Data Shows and Hides

The short version

Form 13F is a quarterly report of equity holdings filed by institutional investment managers that exercise investment discretion over at least $100 million of "Section 13(f) securities". Hedge funds, mutual fund companies, pension managers, banks and insurance companies all file it.

A 13F is a snapshot of long positions in US exchange-traded equities and a few related instruments, as of the last day of a quarter, filed up to 45 days later. It does not show short positions, it does not show what happened during the quarter, and by the time you read it the holdings may have changed. It is useful for seeing who owned a stock at a point in time, and much less useful for knowing what a manager owns today.

Who files and when

A manager becomes a filer once the Section 13(f) securities over which it has investment discretion reach $100 million on the last trading day of any month of a calendar year. It must then file for the quarter ending December 31 of that year and for each of the next three quarters, and keeps filing as long as it stays above the threshold.

The deadline is 45 days after the end of each calendar quarter.

When the 45th day falls on a weekend or holiday, the deadline moves to the next business day. Many managers file in the final days of the window.

What is in a 13F

The report has a cover page, a summary page and an information table. Each row of the information table includes:

• the issuer name, class of security and CUSIP;
• the market value of the position at quarter end (reported in dollars, rounded to the nearest dollar, since 2023; earlier filings reported thousands);
• the number of shares or principal amount;
• whether the row is a put or call option;
• investment discretion (sole, shared or defined) and voting authority.

The SEC publishes the official list of Section 13(f) securities each quarter. It mainly covers exchange-listed US stocks, plus certain equity options and warrants, shares of closed-end funds and ETFs, and some convertible debt.

What a 13F does not show

This is where most misreadings come from.

Options rows deserve care. A row marked as a call or put reports the value and share count of the underlying shares, not the premium paid. A put row on a manager's 13F might be a hedge on a long position rather than a bearish bet; the form does not say which.

A worked example

Hypothetical: Fund Y files its 13F for the quarter ended June 30 on August 14. It reports 2,000,000 shares of Company X, valued at $16,000,000 ($8.00 per share at the June 30 close). The previous quarter's 13F showed 3,500,000 shares.

All figures hypothetical.

The value fell by $19,000,000, but only $12,000,000 of that ($8.00 × 1,500,000) reflects the reduction in shares; the rest is the price change on shares still held. And the reduction might have happened on April 1 or June 29. If Company X has 50,000,000 shares outstanding, Fund Y went from 7% to 4% of the company, which is the kind of change that can also trigger a Schedule 13G amendment well before the 13F arrives.

How 13F relates to other ownership filings

• Schedules 13D and 13G are triggered by crossing 5% of a class and arrive much faster. See 13D vs 13G.
• Form 4 reports trades by company insiders within two business days. See Form 4 codes.
• Form N-PORT reports fund-level portfolio holdings for registered funds, with public release on a lag.

Institutional ownership as a percentage of shares outstanding, built from 13F data, can exceed 100% for heavily shorted stocks, because borrowed shares that were sold short can end up reported as long holdings by another manager. It also says nothing directly about public float, which is a separate measure.

How to check a company on Signal8

• The institutions page lets you look up a manager and see its reported holdings and quarter-over-quarter changes.
• Company pages include institutional ownership drawn from 13F filings, for example AAPL.
• For the fast-moving side of ownership, the insider trades page covers Form 4 activity.

FAQ

How delayed is 13F data?

A 13F reports holdings as of the last day of a calendar quarter and is due 45 days later. A position shown on a 13F filed in mid-August reflects holdings on June 30, and the manager may have traded since. The snapshot is at least 45 days old when filed and can be more than four months old by the time the next 13F replaces it.

Do 13F filings include short positions?

No. Form 13F reports long positions in Section 13(f) securities only. Short sales of stock are not reported, so a manager that is both long and short a stock appears simply long. Put options are reported, but as the value of the underlying shares, and the form does not say whether a put is a hedge or a directional position.

Who has to file a 13F?

Institutional investment managers that exercise investment discretion over at least $100 million of Section 13(f) securities on the last trading day of any month of a calendar year. That includes hedge funds, mutual fund sponsors, banks, insurance companies, pension managers and broker-dealers that manage accounts. Individuals managing only their own money do not file.

Why is a fund I know owns a stock missing from the 13F holder list?

Several reasons are possible: the position may have been sold before quarter end, held through an entity that files under a different name, held in a form 13F does not cover, or granted confidential treatment. Small positions under 10,000 shares and $200,000 may also be omitted. Missing from the list is not proof the fund does not own the stock.