SEC 13F Filings: Complete Guide to Institutional Holdings
Every quarter, institutional investment managers controlling over $100 million in U.S. equities must publicly disclose their holdings to the SEC. This guide covers the complete 13F framework — the legal basis, who files, what's disclosed, what's excluded, filing deadlines, and how to use 13F data for investment research.
What Is a 13F Filing?
Form 13F is a quarterly disclosure report filed with the U.S. Securities and Exchange Commission by institutional investment managers that exercise investment discretion over $100 million or more in Section 13(f) securities. The requirement comes from Section 13(f) of the Securities Exchange Act of 1934, as amended by the Securities Acts Amendments of 1975. Congress enacted the requirement to provide transparency into institutional trading patterns and give the SEC visibility into ownership concentrations in publicly traded companies.
The standard filing is Form 13F-HR (Holdings Report). The quarterly disclosure reveals all equity positions held as of the last day of each calendar quarter — positions that may have been held unchanged for years or may have been established in the final days of the quarter. This point-in-time snapshot, published with a 45-day delay, is the primary tool investors use to observe where institutional capital is deployed.
13F filings contain more than just a list of stocks. Each entry discloses the security's CUSIP number (a unique 9-digit identifier for the specific security), the value in thousands of dollars, the number of shares, whether the position is held with sole or shared investment discretion, and the voting authority the manager exercises. This granularity makes 13F data more than a simple portfolio snapshot — it reveals the governance footprint of major institutional investors across the companies they hold.
Legal Basis: Section 13(f) of the Exchange Act
The legal authority for 13F filings derives from Section 13(f) of the Securities Exchange Act of 1934. The statute directs the SEC to adopt rules requiring institutional investment managers to file reports disclosing their equity holdings. The implementing regulation — SEC Rule 13f-1 at 17 CFR §240.13f-1 — defines the filing threshold, timing requirements, content requirements, and exemptions.
The SEC maintains a quarterly list of Section 13(f) securities — the specific instruments subject to the reporting requirement. This list is published at the SEC's website each quarter and includes exchange-traded equity securities, closed-end fund shares, and exchange-traded convertible debt. Money market instruments, most fixed income, U.S. Treasuries, and non-U.S. exchange-listed securities are not Section 13(f) securities and do not appear in 13F filings.
The $100 million threshold that triggers the reporting obligation is based on the aggregate fair market value of Section 13(f) securities over which the manager exercises investment discretion. The threshold is assessed at any point during the calendar year — if a manager's qualifying securities briefly exceed $100 million, the full-year reporting obligation is triggered. First-time filers must file their initial 13F within 45 days of the calendar quarter during which they first exceeded the threshold.
Who Must File a 13F?
Any entity that exercises "investment discretion" over $100 million or more in Section 13(f) securities must file. Investment discretion means having authority to make buy and sell decisions for accounts — not merely providing advice without trading authority. The filer is the investment manager, not the fund. A management company managing multiple funds files one consolidated 13F reflecting all managed accounts, not separate filings per fund.
The 13F obligation captures a broad range of institutional actors: hedge fund management companies, registered investment advisors, mutual fund companies, ETF sponsors, bank trust departments, pension fund investment managers, insurance company investment departments, broker-dealers exercising discretion, and endowment managers. Foreign investment managers with U.S. equity positions above the threshold may also be required to file, subject to specific exemptions for certain foreign private advisors.
The institutional universe filing 13Fs ranges from the world's largest asset managers (Vanguard, BlackRock, State Street) managing tens of trillions of dollars to small family offices and boutique hedge funds. The SEC estimates over 5,000 institutions file 13F reports each quarter. The largest filers have holdings tables with thousands of positions; the most focused hedge funds may list only a handful.
13F Filing Deadlines
Form 13F-HR is due within 45 calendar days after the last day of each calendar quarter. The 2026 filing deadlines are: February 14 (for Q4 2025 positions), May 15 (Q1 2026), August 14 (Q2 2026), and November 14 (Q3 2026). If the deadline falls on a weekend or federal holiday, it moves to the next business day.
There is no accelerated/non-accelerated distinction for 13F filers — the 45-day deadline applies universally to all managers required to file. Unlike 10-K and 10-Q filings, there is no NT (notification of late filing) mechanism available for 13F reports. Late filings are compliance violations that attract SEC attention.
Amended 13F-HR filings (identified as 13F-HR/A in EDGAR) are required when a manager discovers material errors in a previously filed report. The amendment must be filed promptly and supersedes the original for the reporting period. When conducting historical 13F analysis, check whether amendments have been filed for any quarters you are reviewing.
What the 13F Holdings Table Discloses
The core of any 13F-HR filing is the information table, which contains one row per reported position. Each row discloses: the issuer's name, the title of class (common stock, preferred, convertible, etc.), the CUSIP number, the fair market value in thousands of dollars, the number of shares (or principal amount for debt securities), the investment discretion type (sole, shared, or other), and the voting authority (sole, shared, or none).
The value column is the fair market value as of the quarter's last trading day. For equity positions, this is shares × closing price on the last trading day of the quarter. The shares column shows how many shares were held. Dividing the value by the share count gives you the implied price per share — which should match the actual closing price on the last day of the quarter for an accurately filed report.
The investment discretion and voting authority fields reveal the fund's governance presence in the companies it holds. Sole discretion means the filer makes all buy/sell decisions without input from others. Sole voting authority means the filer controls how shares are voted at shareholder meetings. Large index fund managers like BlackRock and Vanguard exercise significant voting authority over essentially every U.S. public company — a governance dynamic that has attracted increasing academic and regulatory attention.
What 13F Filings Do NOT Include
Understanding 13F limitations is as important as understanding what is disclosed. The filing covers only Section 13(f) securities — primarily U.S.-listed equities. Excluded from 13F reporting are: cash and cash equivalents, U.S. government securities, corporate bonds, bank loans, foreign equities listed only on non-U.S. exchanges, private equity investments, real estate, commodities, currencies, most derivatives (with specific exceptions for certain options), hedge fund interests, and limited partnership interests.
For a global macro fund like Bridgewater Associates or a commodity-focused manager, the disclosed 13F holdings may represent only a small fraction of actual capital deployment. A manager with $200 billion in total AUM but only $15 billion in U.S. equities will show a 13F that looks dramatically different from the overall portfolio strategy. This limitation is critical context for any research that attempts to "reverse-engineer" a manager's investment approach from 13F data alone.
Additionally, short positions — bearish bets where a manager borrows and sells shares expecting to profit from price declines — are not disclosed in 13F filings. Long-short equity hedge funds may have significant short books that are entirely invisible in the public 13F. A fund showing 40 long positions in its 13F might simultaneously have 40 short positions whose aggregate value exceeds the longs — making the 13F a potentially misleading picture of the fund's actual market exposure.
How to Find 13F Filings on EDGAR
The most direct path to 13F filings is our free 13F Holdings Viewer — enter a fund or manager name, and the tool retrieves the most recent 13F-HR directly from SEC EDGAR. For accessing multiple quarters' filings or working with the raw data, direct EDGAR access is also straightforward.
On EDGAR directly: go to the company search (or use our Company Search), enter the management company name (not the fund name), select the result with the matching state and SIC code, and filter the filing list by "13F-HR." The company's EDGAR page will list all quarterly 13F-HR filings from when the manager first exceeded the reporting threshold.
For programmatic bulk access to 13F data across many managers, the EDGAR full-index quarterly files are the most efficient approach. The index files at https://www.sec.gov/Archives/edgar/full-index/ list all filings by type, providing accession numbers and CIKs for every 13F-HR filed in a quarter. From there, you can download and parse the XML holdings tables for all filers in a given quarter.
How to Read and Analyze a 13F Filing
When you open a 13F-HR filing, start with the cover page to confirm: the filer's identity and CIK, the report date (last day of the reporting quarter), and whether this is the complete holdings report or a report that excludes confidentially treated positions. Then proceed to the information table.
Sort the holdings table by value (largest to smallest) to identify the top positions by market value. For a concentrated hedge fund with 30 positions, the top five holdings often represent 50%+ of the disclosed portfolio and reflect the manager's highest-conviction ideas. For a large diversified manager like Vanguard, the largest positions reflect index composition.
For quarter-over-quarter analysis: download the current quarter's 13F and the prior quarter's 13F. Build a comparison showing (1) positions in the current quarter but not the prior (new positions), (2) positions with increased share counts (additions), (3) positions with decreased share counts (reductions), and (4) positions in the prior quarter but not the current (complete exits). These changes reveal the direction of the manager's investment activity during the quarter.
Notable 13F Filers and What to Look For
Berkshire Hathaway (CIK 0001067983) is the most closely followed 13F filer in the world. Warren Buffett's long-term, concentrated, value-oriented approach means that new positions and significant additions in Berkshire's 13F are interpreted as meaningful signals. Key positions to track include the continued size of the Apple position and changes in financial sector holdings. Note that Berkshire's 10-K annual report (not just the 13F) provides more complete disclosure of the investment portfolio.
Activist investors like Carl Icahn, Bill Ackman (Pershing Square, CIK 0001336528), and Elliott Management are particularly interesting 13F filers because their equity holdings often reflect specific activist campaigns. New large positions in their 13F may indicate unrevealed activist activity — particularly if followed by a Schedule 13D filing when the position crosses 5%.
Concentrated value funds — managers running focused portfolios of 15-30 high-conviction positions — often provide the most interpretable 13F signals. Look for managers whose disclosed portfolios show consistent holding periods, concentrated positions in value-oriented sectors, and a track record of successful investments before they became consensus views.
13F Data and Confidentiality Requests
Not all positions in a manager's portfolio necessarily appear in the public 13F filing. Under SEC rules, managers may request confidential treatment for specific positions by filing Form 13F-CTR (Confidential Treatment Request) along with their 13F. The SEC reviews the request and may grant it, in which case the position is redacted from the public filing for a period.
Confidential treatment is typically granted for position-building situations where premature disclosure would allow market participants to front-run the manager's purchases. The SEC granted confidential treatment to Berkshire Hathaway for the initial filing period when Buffett was building the Berkshire Apple position — enabling the full position to be built before market awareness drove up the price. When confidentiality periods expire, the redacted positions are disclosed retroactively in an amended 13F-HR/A filing.
The existence of confidentiality requests means that any 13F filing may understate a manager's actual equity holdings. When reviewing a 13F, check whether the filing notes any confidentially treated positions. The absence of this note confirms the filing represents complete disclosure; its presence indicates some positions are withheld from public view.
Using 13F Data Responsibly
The popular practice of "piggy-backing" institutional 13F filings — buying stocks because a famous investor disclosed holding them — has significant risks that are frequently understated. By the time you see a 13F filing, the position was established up to 45 days ago, at prices that may be substantially different from current market prices. The manager may have partially or fully exited the position in the weeks between quarter-end and filing date.
Furthermore, you see the position but not the thesis, the time horizon, the portfolio context, or the entry price. Buffett's Apple position may have cost $36 per share (2016 prices) and represent a position he would hold through significant volatility because the unrealized gain provides cushion. Buying Apple today at $200+ because Buffett holds it is a very different investment proposition.
The most productive use of 13F data is as a starting point for independent research — identifying companies worth investigating because a manager you respect has taken a significant position, then doing your own fundamental work to determine whether the investment makes sense at current prices and in your specific portfolio context. Never use 13F data as a substitute for independent analysis.
Frequently Asked Questions
What is a 13F filing?
Form 13F is a quarterly SEC report required from institutional investment managers with $100M or more in U.S. equities. It discloses all equity holdings as of each quarter end, with a 45-day publication lag.
When are 13F filings due in 2026?
Q4 2025 positions: February 14, 2026. Q1 2026: May 15. Q2 2026: August 14. Q3 2026: November 14. All filers share the same 45-day deadline after each quarter end.
How current is 13F holdings data?
13F data reflects positions as of the quarter end, disclosed 45 days later. By publication, a manager may have changed positions significantly. Treat 13F data as historical context, not real-time positioning.
Can I see short positions in 13F filings?
No. 13F filings only cover long positions in Section 13(f) securities. Short positions, options used for hedging, and all non-equity positions are excluded from 13F disclosures.
What is Berkshire Hathaway's CIK?
Berkshire Hathaway's CIK is 0001067983. You can view their 13F filings using our 13F Holdings Viewer tool or directly on SEC EDGAR.
Are 13F filings accurate?
13F filings are official SEC disclosures with legal consequences for inaccuracies. However, they may exclude confidentially treated positions (with SEC approval) and do not reflect non-equity positions. Amendments (13F-HR/A) correct errors in prior filings.
What is Form 13F-NT?
Form 13F-NT is a Notice filing used when a manager believes they are not required to file a holdings report for a given quarter — typically because assets fell below the $100M threshold. It contains no holdings data.