Schedule 13D Filing Requirements: 2026 Practitioner Walkthrough
If your fund or entity crosses 5% beneficial ownership of a Section 12-registered equity class, you have 5 business days to file a Schedule 13D with the SEC. Not 10 calendar days. That deadline changed in October 2023, and many compliance teams are still operating under the old rule.
This walkthrough covers every step: what triggers the obligation, how to count the clock, what the form requires, when to amend, and where filers get caught out.
Who Must File a Schedule 13D?
Any person or group that acquires beneficial ownership of more than 5% of a class of equity securities registered under Section 12 of the Exchange Act must file a Schedule 13D, unless they qualify to use the shorter Schedule 13G instead.
Under 17 CFR § 240.13d-1(a), the rule covers:
- Individual investors
- Hedge funds and private equity funds
- Activist investors with any intent to influence the issuer
- Groups of persons acting in concert (see group formation rules below)
- Non-U.S. persons holding Section 12-registered securities
The securities subject to reporting are those of companies with equity listed on a national securities exchange, or with total assets exceeding $10 million and a class of equity held by 2,000 or more persons (or 500 or more non-accredited investors).
If you are a passive investor or a qualified institutional investor, you may be eligible to file Schedule 13G instead. The Schedule 13G filing requirements and the 13D vs. 13G comparison are covered in dedicated Finrep guides.
What Is the Current Schedule 13D Filing Deadline?
The current deadline is 5 business days after the acquisition that causes beneficial ownership to exceed 5%. The SEC's October 2023 final rule amendments (Release No. 33-11253; 34-98704) cut this from the former 10 calendar days.
As the CFR now reads:
"Any person who... is directly or indirectly the beneficial owner of more than five percent of the class shall, within five business days after the date of the acquisition, file with the Commission, a statement containing the information required by Schedule 13D." -- 17 CFR § 240.13d-1(a)
The filing cut-off time was also extended from 5:30 p.m. to 10:00 p.m. Eastern time, consistent with Section 16 filings.
Key takeaway: If your compliance calendar still says "10 days," update it immediately. The 5-business-day clock has been in effect since early 2024.
When Does the Filing Clock Start: Trade Date or Settlement Date?
The clock starts on the trade date, not the settlement date. This is one of the most consequential practical questions the 2025 CDI updates addressed directly.
On July 11, 2025, the SEC Division of Corporation Finance published updated Compliance and Disclosure Interpretations (CDIs) aligning staff guidance with the 2023 amendments. As Mayer Brown summarized:
"Schedule 13D must be filed with five business days after the trade date of the acquisition transaction, with the first calendar day after the trade date being the first business day."
In practice: if you execute a block trade on Monday that pushes you above 5%, your filing is due by the close of business on the following Monday (counting Tuesday through Monday as five business days). Do not wait for T+1 or T+2 settlement.
How Is Beneficial Ownership Calculated?
Beneficial ownership is broader than shares held in your own name. Under 17 CFR § 240.13d-3, a person is the beneficial owner of a security if they have, directly or indirectly:
- Voting power (the right to vote or direct the voting of the security), or
- Investment power (the right to dispose of or direct the disposition of the security)
This sweeps in shares held through nominees, affiliates, and discretionary accounts.
Do Derivatives Count Toward the 5% Threshold?
Yes, under certain conditions. Rule 13d-3(b) deems a person the beneficial owner of any security they have the right to acquire within 60 days, through options, warrants, convertible notes, or similar instruments. If you hold call options exercisable within 60 days that would give you shares pushing you above 5%, those underlying shares count now.
The 60-day look-forward rule catches many funds off guard, particularly those running convertible arbitrage or holding warrants in PIPE transactions. Count every right-to-acquire position with a 60-day or shorter exercise window when you calculate your threshold exposure.
Note: the 2023 amendments also clarified that cash-settled derivatives should be disclosed in Schedule 13D filings, even though the SEC did not expand the formal beneficial ownership definition to cover them. Disclose them in Item 6 (see below).
How Do Group Holdings Aggregate?
Two or more persons who agree to act together to acquire, hold, vote, or dispose of equity securities are treated as a single "group" under Section 13(d)(3) of the Exchange Act. The group's combined holdings are measured against the 5% threshold, and the group itself is the reporting person.
The 2023 amendments included a limited safe harbor: certain coordination activities, such as sharing research or engaging in general discussions about an issuer, do not automatically constitute group formation under Section 13(d)(3). However, any agreement to act in concert on voting or disposition crosses the line. If two funds each hold 3% and agree to vote together on a shareholder resolution, they likely form a group with a 6% aggregate position and a filing obligation.
For a full treatment of group formation mechanics, see the beneficial ownership group formation guide.
What Information Must a Schedule 13D Include?
Schedule 13D (17 CFR § 240.13d-101) requires disclosure across seven items. Here is what each demands in practice:
| Item | Subject | What to Prepare |
|---|---|---|
| Item 1 | Security and Issuer | Name, class of security, CUSIP, issuer's principal office |
| Item 2 | Identity and Background | Full legal name, address, citizenship, occupation; criminal/regulatory history for all covered persons |
| Item 3 | Source and Amount of Funds | Where the money came from (cash, margin loan, fund capital); total consideration paid |
| Item 4 | Purpose of the Transaction | Plans to acquire control, seek board seats, propose a merger, restructure, or liquidate the issuer |
| Item 5 | Interest in Securities | Number of shares, percentage of class, transactions in the past 60 days |
| Item 6 | Contracts and Arrangements | Any agreements relating to the issuer's securities, including derivatives, voting agreements, and side letters |
| Item 7 | Material to Be Filed as Exhibits | Agreements, contracts, and other documents required to be filed as exhibits |
Item 4: The Most Sensitive Disclosure
Item 4 is where activist investors face the most litigation and SEC scrutiny. It requires disclosure of any plans or proposals to:
- Acquire additional securities or dispose of existing holdings
- Cause an extraordinary corporate transaction (merger, sale, liquidation)
- Change the board composition or management
- Alter the capitalization or dividend policy
- Make any other material change to the issuer's business
Vague boilerplate in Item 4 invites SEC comment letters and shareholder litigation. If you have a specific plan, disclose it specifically. If you genuinely have no plan beyond holding, say so plainly and be prepared to amend promptly if that changes.
Item 6: Derivatives and Side Arrangements
Item 6 requires disclosure of all contracts, arrangements, understandings, or relationships with any person with respect to the issuer's securities. This includes cash-settled total return swaps, equity collars, and any voting or standstill agreements. The 2023 amendments reinforced that cash-settled derivatives belong here even if they do not count as beneficial ownership under Rule 13d-3.
When Must You File a Schedule 13D Amendment?
A 13D/A amendment is due within 2 business days of any material change in the facts previously reported. This replaced the old "promptly" standard, which was undefined and routinely interpreted loosely.
The July 2025 CDI updates confirmed this by deleting all references to "prompt" timing from the staff's interpretive guidance, as Mayer Brown noted:
"The updates bring the CDIs into alignment with amendments to Regulations 13D and 13G adopted in October 2023... including deletion of references to 'prompt' timing of amendments to Schedule 13D, where Rule 13d-2(a) now requires amendments within 2 business days."
Material changes that trigger a 13D/A include:
- A change in the percentage of shares beneficially owned (buying or selling)
- A change in the purpose of the transaction (e.g., moving from passive observation to seeking board representation)
- Entry into or termination of a material agreement relating to the issuer's securities
- Any change in the information required by Items 2 through 6
For a dedicated treatment of amendment triggers and mechanics, see the Schedule 13D amendment requirements guide.
Schedule 13D vs. Schedule 13G: Which Form Applies?
The choice between 13D and 13G turns on investor type and intent. Here is a side-by-side comparison:
| Factor | Schedule 13D | Schedule 13G (QII) | Schedule 13G (Passive) |
|---|---|---|---|
| Who files | Any 5%+ holder not eligible for 13G | Registered broker-dealers, banks, insurers, registered investment companies, registered investment advisers, ERISA plans, savings associations, church plans, non-U.S. equivalents | Non-institutional investors with no control intent |
| Intent requirement | Any intent (including activist) | Acquired in ordinary course, no control purpose | No control purpose or effect |
| Ownership ceiling | None | None (but 10% triggers accelerated deadline) | Must be below 20% |
| Initial deadline | 5 business days after trade date | 45 days after quarter-end (or 5 business days after month-end if over 10%) | 5 business days after acquisition |
| Amendment deadline | 2 business days after material change | 45 days after quarter-end (material changes only) | 2 business days after material change |
| Disclosure depth | Full (Items 1-7) | Short-form | Short-form |
A non-institutional passive investor who holds 20% or more cannot use Schedule 13G regardless of intent. That 20% ceiling is a hard line under 17 CFR § 240.13d-1(c)(3).
Switching Between Forms
A 13D filer who later qualifies as passive can convert to 13G by filing a Schedule 13G and noting the conversion. The reverse is also required: a 13G filer who develops a control purpose or effect must switch to 13D within 5 business days. For the full conversion mechanics, see the switching from 13G to 13D guide and the switching back from 13D to 13G guide.
How to File Schedule 13D on EDGAR
Schedule 13D is filed electronically through EDGAR Online Forms. The steps:
- Log in to the EDGAR Online Forms website.
- Select "Schedule 13D" from the left-hand menu.
- Select "Schedule 13D" for an initial filing or "Amendment to Schedule 13D" for a 13D/A. Have your prior accession number ready for amendments.
- Complete all required fields (marked with an asterisk).
- Attach exhibits under the Documents section (agreements, contracts required by Item 7).
- Submit before 10:00 p.m. Eastern time on the due date.
Since December 18, 2024, the body of Schedule 13D (but not exhibits) must be prepared in structured, machine-readable XML format per the 2023 amendments. Verify your filing system supports this before the deadline.
Enforcement Risk: What Happens If You File Late or Deficiently?
Late or deficient Schedule 13D filings carry real consequences. Violations of Section 13(d) can result in:
- SEC civil enforcement actions
- Injunctive relief (including orders to disgorge voting rights)
- Disgorgement of profits
- Civil monetary penalties
- Criminal prosecution under Section 32 of the Exchange Act in egregious cases
The SEC has historically pursued activist hedge funds, institutional investors, and individuals for late or incomplete 13D and 13G filings. The accelerated deadlines introduced in 2023 have tightened the window for error, and the 2-business-day amendment standard leaves almost no buffer when a material change occurs mid-deal.
Common enforcement triggers include:
- Filing after the 5-business-day window (especially when teams still use the old 10-day rule)
- Failing to aggregate holdings across affiliated entities or funds
- Omitting derivative positions that count under Rule 13d-3(b)
- Filing a 13G when activist intent disqualifies the filer
- Vague or incomplete Item 4 disclosure when a specific plan exists
- Missing the 2-business-day amendment deadline after a material change
Practical Compliance Checklist
Before a deal closes or a position is built, run through this sequence:
- Calculate beneficial ownership correctly. Aggregate all affiliated accounts, discretionary accounts, and derivative positions with a 60-day or shorter exercise window. Include any group members' holdings if a coordination agreement exists.
- Identify the triggering acquisition. Note the trade date, not the settlement date. That is day zero.
- Determine the form. Are you a qualified institutional investor filing in the ordinary course with no control intent? Consider 13G. Otherwise, file 13D.
- Set the deadline. Count 5 business days from the trade date. File by 10:00 p.m. Eastern on day 5.
- Prepare all seven items. Pay particular attention to Item 4 (purpose) and Item 6 (derivatives and agreements). Do not use boilerplate for Item 4 if you have a specific plan.
- File in XML. Ensure the body of the Schedule 13D is in structured XML format per the December 2024 requirement.
- Monitor for material changes. Any change in ownership percentage, purpose, or material agreements requires a 13D/A within 2 business days of the triggering event.
- Engage counsel early. For activist positions or complex derivative structures, outside counsel review before filing is standard practice.
FAQ
Who is required to file a Schedule 13D? Any person or group that acquires more than 5% beneficial ownership of a class of equity securities registered under Section 12 of the Exchange Act, unless they qualify to file the shorter Schedule 13G instead. This includes individuals, funds, and groups acting in concert.
Is the Schedule 13D deadline still 10 days? No. The SEC's October 2023 amendments reduced the initial filing deadline to 5 business days from the trade date of the triggering acquisition. The old 10-calendar-day rule no longer applies.
What information is required in Schedule 13D Item 6? Item 6 requires disclosure of all contracts, arrangements, understandings, or relationships with any person with respect to the issuer's securities. This includes voting agreements, standstill arrangements, options, warrants, convertible instruments, and cash-settled derivatives such as total return swaps.
How many days do you have to file a 13D? Five business days from the trade date of the acquisition that pushes beneficial ownership above 5%. The first calendar day after the trade date counts as business day one.
When must a Schedule 13D amendment be filed? Within 2 business days of any material change in the facts previously reported. The former "promptly" standard was eliminated by the 2023 amendments and confirmed removed in the July 2025 CDI updates.
Do options and convertible notes count toward the 5% threshold? Yes, if they are exercisable or convertible within 60 days. Rule 13d-3(b) deems the holder the beneficial owner of the underlying shares for threshold calculation purposes.
What happens if two funds coordinate their voting? They likely form a "group" under Section 13(d)(3), and their combined holdings are aggregated for the 5% threshold. The group becomes the reporting person and must file a single Schedule 13D covering all members' positions.
