SEC Form 13F: filing rules, limits and interpretation
TL;DR
- Who files: Institutional investment managers exercising investment discretion over $100 million or more in Section 13(f) securities — investment advisers, banks, broker-dealers, insurance companies, pension funds, and foreign managers meeting the threshold.
- When it appears: Due 45 calendar days after each quarter-end. The SEC grants no extensions, and late filings remain non-compliant (SEC Form 13F).
- What it does not show: Short positions, cash, most bonds, private securities, or a real-time portfolio. It is a quarterly snapshot that can become stale before publication.
What is Form 13F?
Form 13F is a quarterly public-reporting form mandated by Section 13(f) of the Securities Exchange Act of 1934. It requires large institutional investment managers to disclose their holdings of certain U.S. equity securities at the close of each calendar quarter.
The disclosure covers long positions in securities on the SEC's Official List of Section 13(f) Securities: U.S.-exchange-traded stocks, ETFs, closed-end fund shares, certain convertible debt securities, certain equity options, and certain warrants. The form does not cover open-end mutual funds, most bonds, swaps, futures, or non-U.S. traded securities (SEC Form 13F).
Who must file Form 13F?
A manager generally must file if it meets three conditions simultaneously:
- It exercises investment discretion — the power to decide which securities are bought or sold — over one or more accounts.
- Those accounts hold Section 13(f) securities with an aggregate fair market value of at least $100 million.
- The $100 million threshold is reached on the last trading day of any month during the calendar year (SEC Form 13F FAQ).
Once the threshold is crossed, the manager must make four consecutive quarterly filings for that year and the following year — even if holdings later fall below $100 million. A natural person investing only for their own account generally does not qualify as an institutional investment manager.
What goes into the Information Table?
The Form 13F Information Table lists, per holding:
| Field | What it means |
|---|---|
| Issuer name | Company or fund issuing the security |
| Title and class | Common stock, preferred stock, ETF class, option type |
| CUSIP | Unique identifier for the security |
| Shares or principal amount | Position size in shares or face value |
| Fair market value | Quarter-end valuation of the position |
| Investment discretion | Sole, shared, or none — who decides trades |
| Voting authority | Sole, shared, or none — who votes the shares |
| Source | The SEC EDGAR filing the data originates from |
Investment discretion and voting authority are separate fields. A manager can hold sole discretion to buy or sell while reporting "none" on voting authority if the client retains proxy votes (SEC Form 13F FAQ).
Filing deadlines and timing
Each Form 13F covers a calendar quarter and is due 45 calendar days after the quarter closes:
| Reporting quarter | Period end | Standard deadline |
|---|---|---|
| Q1 | March 31 | May 15 |
| Q2 | June 30 | August 14 |
| Q3 | September 30 | November 14 |
| Q4 | December 31 | February 14 of the following year |
The SEC adjusts the actual date when the deadline falls on a weekend or federal holiday. Filing types include 13F-HR for a standard holdings report, 13F-NT when another manager already reports the holdings, and 13F-HR/A for amendments (SEC Form 13F FAQ).
What the lag means for investors
A filing dated August 14, 2026, with a period of report of June 30, 2026, describes holdings as of June 30, not the filing date. By mid-August, the manager may have sold, increased, or closed the positions shown. The SEC cautions that EDGAR acceptance confirms formatting, not substantive accuracy (SEC Form 13F FAQ).
What Form 13F does not show
Form 13F is not a complete portfolio picture. Key exclusions:
- Short positions — equity short sales are generally not reported.
- Written options — short puts and short calls are generally excluded.
- Cash and non-reportable bonds — most bonds, money-market instruments, and cash balances do not appear.
- Non-U.S. securities — equities traded only outside U.S. exchanges generally are not covered.
- De minimis omissions — a manager may omit a position if it holds fewer than 10,000 shares and the fair-market value is under $200,000 (SEC Form 13F FAQ).
- Confidential treatment — limited positions may be temporarily withheld under a confidential-treatment request, though the filing obligation itself is not removed (SEC Confidential Treatment).
Because only qualifying long positions appear, a 13F holding is not evidence of a manager's net exposure, highest-conviction idea, or complete investment strategy.
Form 13F vs. Form 4: not the same thing
The most common confusion is between Form 13F (institutional holdings) and Form 4 (insider transactions). They report fundamentally different information:
| Feature | Form 13F | Form 4 |
|---|---|---|
| Who files | Institutional investment managers ≥ $100M in 13(f) securities | Directors, officers, and >10% beneficial owners |
| What it reports | Holdings at quarter-end | Specific transactions: purchases, sales, grants, exercises |
| Deadline | 45 days after quarter-end | By the second business day after the transaction |
| Detail level | Aggregate position size and market value | Transaction date, price, number of securities, resulting ownership |
| Coverage scope | Only 13(f) securities on the SEC's list | Reportable equity and derivative securities of that issuer |
Form 4 can signal recent insider buying or selling. Form 13F shows a lagged snapshot. A 13F increase does not prove a recent purchase — the fund could have accumulated or trimmed shares throughout the quarter (SEC Ownership Reports).
Neither form constitutes evidence of illegal insider trading. Form 4 reflects lawful reporting obligations triggered by ownership changes, not illicit conduct.
How to read FundamentalRadar's filer and ownership analysis
FundamentalRadar's Filers tab can request disclosure data from SEC EDGAR for U.S. stocks or CVM for Brazilian stocks. The response may contain four categories, but the interface shows a tab only when that category is available:
- Insiders — Form 4 filings from officers, directors, and >10% beneficial owners.
- Institutional (13F) — quarterly holdings from institutional investment managers.
- Congress — transaction disclosures when the source provides them.
- Analysts — analyst coverage when the source provides it.
Reading the filer table correctly
Each row in the filer table shows:
| Column | Meaning |
|---|---|
| Filer | Reporting entity |
| Action | Buy, sell, or holding — color-coded |
| Transaction / Filing date | Trade date vs. filing date |
| Shares | Position size at disclosure |
| Value | Fair market value in filing currency |
| Source | Link to the original EDGAR or CVM filing |
What "holding disclosed" actually means
A row showing a filer with no share count and no market value is an unread holding — the filer appeared in the search index, but the platform did not extract holding data from the information table. Treat it as an indication of a relationship with the stock, not a confirmed position size.
Endpoint limits and data freshness
The filers endpoint returns at most 100 records per category; the table renders the first 40. The banner shows data freshness: verified, stale, or unavailable.
What the data signals vs. what it does not
FundamentalRadar's analysis workspace labels this section explicitly: it is a signal, not a fundamental indicator. A spike in insider buying does not guarantee a price increase. A hedge fund's 13F showing a large position does not reveal the fund's net exposure after hedging.
Use FundamentalRadar's filer data to:
- Track ownership concentration across institutional holders over time.
- Spot new institutional entries or exits between quarters.
- Compare insider transaction direction with a stock's valuation metrics.
Do not use it as a trading signal, a live portfolio tracker, or a substitute for reading the actual SEC EDGAR filing. Also compare against portfolio concentration limits.
Common errors and fixes
| Error | Cause | Fix | Source |
|---|---|---|---|
| Treating 13F as a live portfolio | Filing is a quarter-end snapshot with a 45-day lag | Check the period of report date, not the filing date | SEC Form 13F FAQ |
| Confusing 13F with Form 4 / insider trading | 13F = institutional holdings; Form 4 = insider transactions | Identify which form type the data comes from; they have different filers and cadences | SEC Ownership Reports |
| Assuming a 13F shows net exposure | 13F reports long positions only; short positions are excluded | Read the filing to confirm what was reported; hedges and shorts are invisible | SEC Form 13F |
| Interpreting "none" voting authority as no economic interest | Voting authority is separate from investment discretion | A manager can have sole discretion to trade while holding no proxy votes | SEC Form 13F FAQ |
| Assuming all holdings are disclosed | De minimis rule allows omitting positions under 10,000 shares and $200,000 | Missing rows may exist below the reporting threshold | SEC Form 13F FAQ |
| Treating a 13F amendment as a new transaction | 13F-HR/A corrects a prior filing, not a new trade | Compare the amendment's period of report to the original filing | SEC Form 13F FAQ |
| Reading an unread FundamentalRadar row as a confirmed position | The filer appeared in the search index but holding data was not extracted | Check for share count and value fields; nulls indicate an unread holding | FundamentalRadar source code |
Frequently asked Questions (FAQ)
Does Form 13F cover short positions?
No. Form 13F reports long positions only — U.S.-listed stocks, ETFs, closed-end funds, certain convertible debt, certain options, and certain warrants. Short equity positions, written puts and calls, and most non-equity instruments are excluded (SEC Form 13F).
What happens if a manager misses the 45-day deadline?
The SEC does not grant extensions for late Form 13F filings. The filing remains non-compliant. Late submissions still appear on EDGAR but should be evaluated as potentially indicative of compliance risk (SEC Form 13F FAQ).
Can a foreign manager be required to file Form 13F?
Yes. A foreign investment manager that uses the U.S. mail or another instrumentality of U.S. interstate commerce and exercises investment discretion over $100 million or more in Section 13(f) securities may be subject to the filing requirement (SEC Form 13F FAQ).
Why do some FundamentalRadar filer rows show no share count?
Rows with null shares and null value are unread holdings: the filer appeared in the search index, but the platform did not extract holding data from the information table. Do not treat these as zero or negligible positions.
How often is Form 13F data updated?
Once per quarter. EDGAR publishes each filing on acceptance, but the data reflects quarter-end positions. Positions may change significantly before the next filing.
Is Form 13F the same as insider trading disclosure?
No. Form 13F reports institutional portfolio holdings; Form 4 reports insider transactions by officers, directors, and >10% owners. A 13F holding is not evidence of insider trading or illegal activity. Form 4 filings are routine compliance disclosures for lawful ownership changes (SEC Ownership Reports).
What is the $100 million threshold based on?
The threshold is measured using the aggregate fair market value of Section 13(f) securities held across all accounts over which the manager exercises investment discretion, as of the last trading day of any month during the calendar year. It is not total assets under management — only reportable 13(f) securities count (SEC Form 13F FAQ).
Can confidential treatment delay Form 13F disclosure?
A confidential-treatment request may temporarily restrict public disclosure of specific positions — typically during an ongoing acquisition — but the manager still files Form 13F within the 45-day deadline. The request does not eliminate or extend the filing obligation (SEC Confidential Treatment).
Sources
- SEC Form 13F FAQ — Primary SEC reference covering filers, timing, securities, voting authority, and exemptions.
- SEC Form 13F Filing Instructions — Official form and Information Table field definitions.
- SEC Ownership Reports — Form 4 requirements and how insider transactions differ from Form 13F.
- SEC Section 13(f) Confidential Treatment — How confidential treatment interacts with the filing obligation.
- SEC EDGAR Company Search — Public database where all Form 13F and Form 4 filings are searchable.