Schedule 13D Activist Filings: What They Disclose
By Kyle Porter, Executive Vice President & Managing Director.
Updated November 13, 2026
Schedule 13D activist filings explained: who must file, the five business day deadline, what Items 4 and 5 disclose, 13D versus 13G and a 48-hour checklist.
A Schedule 13D is the report an investor must file with the SEC after acquiring more than 5 percent of a registered class of voting equity, unless it qualifies to use the shorter Schedule 13G. Under Rule 13d-1(a), the filing is due within five business days after the acquisition. Under Rule 13d-2(a), an amendment is due within two business days after any material change.
Updated November 9, 2026. Rule text was checked against the eCFR versions of 17 CFR 240.13d-1, 240.13d-2 and 240.13d-101 as published by Cornell Law School's Legal Information Institute, which list amendments through 90 FR 9689 (February 18, 2025) for Rule 13d-1.
In this guide:
Who has to file a Schedule 13D?
A person must file a Schedule 13D when that person, after an acquisition, beneficially owns more than five percent of a class of equity security registered under Section 12 of the Securities Exchange Act and does not qualify to report on the shorter Schedule 13G. Rule 13d-1 text sets the duty in paragraph (a) and excludes classes of non-voting securities in paragraph (i)(1).
The filer can be a hedge fund, a family office, a founder, a strategic buyer or a group acting together. Under Rule 13d-1(k)(2), a group can meet its duty with one joint filing or with a separate filing from each member, and each filing should identify every member. A Duane Morris client alert on the SEC's October 2023 adopting release reports that the SEC also said group status does not depend only on an express agreement.
The filing duty runs from the investor to the SEC. Rule 13d-1 places no filing obligation on the company whose shares are held, so an investor relations team may first see a new stake in the EDGAR feed rather than in a call from the investor.
What is the Schedule 13D deadline, and which rule text applies?
The Schedule 13D deadline is five business days after the date of the acquisition, and the amendment deadline is two business days after a material change. Rule 13d-1(a) states the initial deadline. Rule 13d-2(a) states the amendment deadline and deems an acquisition or disposition of one percent or more of the class to be material. Smaller changes can also be material depending on the facts.
Rule 13d-1(i)(2) defines a business day as any day other than a Saturday, Sunday or federal holiday, running from 12 a.m. to 11:59 p.m. Eastern Time. Before the 2023 amendments, the initial deadline was ten calendar days and amendments were due promptly, according to law firm summaries of the adopting release from Duane Morris and Nixon Peabody. The SEC adopted the change on October 10, 2023, and the Federal Register published the amended rule text on November 7, 2023.
The daily filing cut-off for Schedules 13D and 13G moved from 5:30 p.m. to 10:00 p.m. Eastern Time on the due date, as summarized by TheCorporateCounsel.net and by Bond Schoeneck & King. The table below shows how the five-business-day clock runs for an illustrative event date. It is a calendar example, not a real filer.
Step Date in the example
Date of the acquisition Friday, February 27, 2026
Business day 1 Monday, March 2, 2026
Business day 2 Tuesday, March 3, 2026
Business day 3 Wednesday, March 4, 2026
Business day 4 Thursday, March 5, 2026
Business day 5 (deadline) Friday, March 6, 2026, by 10:00 p.m. Eastern Time
What do Items 4 and 5 of a Schedule 13D disclose?
Item 4 discloses why the investor bought the shares and what plans or proposals it has, and Item 5 discloses how much it owns and how it has traded. Both items are defined in the Schedule 13D form text, Rule 13d-101 form text.
Item 4 asks the investor to describe any plans or proposals in ten categories, labeled (a) through (j). Those categories include:
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buying more securities of the company or selling the ones held
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a merger, reorganization or liquidation involving the company
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a sale or transfer of a material amount of assets
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a change in the board or management, including filling vacancies
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a material change in capitalization or dividend policy
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charter or bylaw changes that could impede an acquisition of control
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delisting a class of securities or ending its registration
Item 5 reports the number and percentage of the class owned, the sole and shared power to vote and to dispose, and each transaction in the past sixty days or since the last Schedule 13D, whichever is shorter. Item 3 covers the source of funds. Item 6 covers contracts and arrangements, including derivatives that use the company's stock as a reference security. Item 7 lists exhibits such as joint filing agreements and letters.
How does a Schedule 13D differ from a Schedule 13G?
A Schedule 13G is a shorter report for holders that are passive or that qualify as certain institutions, while a Schedule 13D is for holders that may seek to influence control. Rule 13d-1(c) lets a passive investor use a Schedule 13G only if it did not acquire the shares with a control purpose or effect and holds less than 20 percent of the class.
Feature Schedule 13D Schedule 13G
Who files Any holder of more than 5 percent that cannot use a 13G Qualified institutions, exempt investors and passive investors under 20 percent
Control purpose Allowed, and described in Item 4 Not allowed at acquisition
Initial deadline Five business days after the acquisition (Rule 13d-1(a)) Passive investors: five business days (13d-1(c)). Institutions: 45 days after quarter end, or five business days after month end if above 10 percent (13d-1(b)(2))
Amendments Two business days after a material change (13d-2(a)) 45 days after quarter end for material changes (13d-2(b)). Passive investors: two business days after crossing 10 percent and after 5 percent moves (13d-2(d))
A 13G filer that forms a control purpose must switch forms. Under Rule 13d-1(e)(1), that investor becomes subject to the 13D rules immediately and files a Schedule 13D within five business days. Under Rule 13d-1(e)(2), the investor may not vote the shares or buy more until the tenth day after the Schedule 13D is filed.
What does a real Schedule 13D look like?
A 2026 Schedule 13D about SoundThinking, Inc. shows each part of the form in one document. The filer is Veradace Capital Management LLC of Dallas, with Veradace Partners LP and principals Alexander Vezendan and John Conlin, and the filing is on EDGAR as SoundThinking Schedule 13D on EDGAR.
The cover lists February 27, 2026 as the date of event and shows that the filer had previously reported the position on a Schedule 13G. Item 4 says Veradace filed that 13G on January 7, 2026 on a passive basis. The 13D marks the change in posture.
The ownership data sits in Items 3 and 5. The fund held 2,039,805 shares plus options on 50,000 more, a combined 16.5 percent of 12,698,453 shares outstanding. That share count is the one the company reported in its Form 10-Q filed November 13, 2025. The filing reports an aggregate purchase price of about $15,452,099, paid from the fund's working capital through open market trades, and a Schedule A lists trades from the past 60 days.
Item 4 tells the company what the investor wants. Veradace said that on February 27 it shared concerns about the company's performance over several years and the lack of a meaningful shareholder perspective on the board, and that it wants two new directors added. It said it did not presently intend to nominate candidates for the 2026 annual meeting and reserved the right to change its views, buy more shares or sell. Item 6 discloses call and put option positions that expire March 20, 2026.
The signature block is dated March 10, 2026, while the date of event is February 27. For that reason an IR team should read the EDGAR acceptance timestamp, not the signature date, when it counts the clock. This guide did not retrieve that timestamp and makes no finding about whether the filing was timely.
How should an IR team read and respond to a Schedule 13D?
An IR team should read a Schedule 13D in a fixed order: the cover page, Item 4, Item 5, Item 6 and the exhibits, then compare the result with the same filer's earlier Schedule 13G. The order matters because the cover page shows the percentage and whether the filers affirm or disclaim group status, while Item 4 shows what they intend to do.
The percentage on the cover may not match the company's current share count. Rule 13d-1(j) lets a filer rely on the company's most recent quarterly or annual report for shares outstanding unless the filer knows that figure is wrong. The SoundThinking filing used a count from a November 2025 report, so the company should recompute the percentage against its own records.
Item 5 shows how fast the investor has been buying, and Item 6 shows whether options, swaps or voting agreements sit behind the position. Exhibits often hold the letters and nomination notices that matter most. A letter to the board in an exhibit can set the company's next steps.
A holding statement should acknowledge the filing, say the board will review it and avoid characterizing the investor's motives. Briefing the board, checking the bylaws for advance notice windows and routing every outside call through one spokesperson reduce the chance of mixed messages. The activist investor defense plan covers the small-cap version of that preparation, and proxy fight communications covers what changes once a contest starts.
If the company decides a response is material, the mechanics of the release and the Form 8-K are covered in the earnings release and Form 8-K guide. If a settlement later changes the board, the Item 5.02 announcements are covered in executive departure announcements. Securities counsel decides whether any company disclosure duty applies.
What belongs in a first-48-hours checklist for a 13D?
A first-48-hours checklist for a Schedule 13D covers reading the filing, briefing the board, naming one spokesperson and checking deadlines, in that order. The steps below fit a company that has just seen a new Schedule 13D on EDGAR.
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Save the filing from EDGAR with its accession number and acceptance time.
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Read the cover page, Items 4 to 6 and every exhibit, and note the percentage, the group status and any options.
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Recompute the percentage against the company's current share count.
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Compare the filing with the filer's earlier Schedule 13G, if one exists, and note what changed.
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Brief the CEO, the chair and the general counsel with a one-page summary of what the filing says and what it leaves out.
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Ask counsel to check the bylaws for advance notice windows and special meeting rights.
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Approve a holding statement and a short question sheet for calls from shareholders and reporters.
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Log every contact with the filer and other holders, and route all of them through one person.
Frequently asked questions
What is the Schedule 13D deadline now?
The Schedule 13D deadline is five business days after the acquisition of more than five percent of a class, and amendments are due two business days after a material change. Those periods come from Rules 13d-1(a) and 13d-2(a) in the eCFR text retrieved on November 9, 2026.
Is every Schedule 13D an activist filing?
No, a Schedule 13D is required of any holder above five percent that cannot use a Schedule 13G, and not every such holder is an activist. Acquirers, founders and strategic investors also file Schedule 13Ds, and Item 4 is where the filer states its purpose.
Can a Schedule 13G filer later file a Schedule 13D?
Yes, a Schedule 13G filer that forms a control purpose must file a Schedule 13D within five business days under Rule 13d-1(e)(1). The investor also cannot vote or buy more shares until the tenth day after that filing under Rule 13d-1(e)(2).
Does the company have to respond to a Schedule 13D?
Rule 13d-1 places the filing duty on the investor, not on the company. Whether the company has any disclosure duty of its own depends on other rules and facts, so counsel should decide before the company says anything beyond a holding statement.
Where do companies find Schedule 13D filings?
Companies find Schedule 13D filings on SEC EDGAR under the issuer's name or CIK number. Law firm summaries report that structured data became mandatory for Schedules 13D and 13G on December 18, 2024, and recent filings such as the SoundThinking schedule are published as structured XML.
What counts as a material change for an amendment?
Rule 13d-2(a) deems an acquisition or disposition of one percent or more of the class to be material. Smaller changes can still be material depending on the facts, and other changes such as a new plan or proposal can also trigger an amendment.
Editorial disclosure and research notes
This page is general information for investor relations and communications readers and is not legal advice. Securities counsel should review any actual filing duty or company response.
Rule text came from the eCFR versions of 17 CFR 240.13d-1, 240.13d-2 and 240.13d-101 on Cornell LII, retrieved November 9, 2026. The Rule 13d-1 history on that page runs through 90 FR 9689 (February 18, 2025), and the Rule 13d-2 and 13d-101 histories run through 88 FR 76982 and 88 FR 76984 (November 7, 2023). This page did not check for changes after those entries. The adoption date, the previous ten-day deadline and the 10:00 p.m. cut-off come from law firm summaries of the SEC's October 2023 adopting release, not from the release itself.
The worked example uses the SoundThinking Schedule 13D as published on EDGAR. This page makes no claim about the investor's motives or results and cites no stock price or return data.
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