When an investor accumulates more than 5% of a publicly traded company's shares, they must disclose that ownership to the SEC. The filing they use — Schedule 13D or Schedule 13G — tells the market something important about their intentions. A 13D filer may be planning to push for changes at the company. A 13G filer is certifying that they have no such plans. This distinction between activist and passive ownership disclosure is one of the most consequential in securities regulation.
Congress determined in 1968, through the Williams Act amendments to the Securities Exchange Act of 1934, that the market deserves to know when concentrated ownership exists and what the holder intends to do with it. This guide explains the 5% threshold, the differences between the two schedules, and the significant rule changes that took effect in 2024.
The 5% Threshold
Section 13(d) of the Securities Exchange Act of 1934, as amended by the Williams Act of 1968, requires any person or group that acquires beneficial ownership of more than 5% of a class of equity securities registered under Section 12 to file a disclosure statement with the SEC.
Beneficial Ownership
The term "beneficial ownership" under Section 13(d) is broader than simply holding shares in a brokerage account. A person is deemed the beneficial owner of securities if they have or share:
- Voting power — the power to vote or direct the voting of the securities
- Investment power — the power to dispose of or direct the disposition of the securities
This means beneficial ownership can extend to shares held by family members, trusts, partnerships, and other entities where the person exercises control. Two or more persons who agree to act together for the purpose of acquiring, holding, or disposing of securities are considered a "group" and their holdings are aggregated for purposes of the 5% threshold.
How This Differs from Other Ownership Filings
The 13D/13G regime occupies a specific niche in the SEC's ownership disclosure framework:
- Form 4 covers transactions by corporate insiders — officers, directors, and holders of 10% or more — regardless of the size of the transaction. A director buying 100 shares must file Form 4. The trigger is the person's relationship to the company, not the size of their position
- Form 13F covers quarterly snapshots of institutional holdings above $100 million in aggregate. It reports all long positions but does not distinguish between 1% positions and 15% positions, and it has no intent disclosure requirement
- Schedule 13D/13G is triggered purely by crossing the 5% beneficial ownership threshold. It applies to anyone — individuals, hedge funds, corporations, groups — and requires disclosure of the holder's intentions
Schedule 13D: The Activist Disclosure
Schedule 13D is the default filing. Any person or group that crosses 5% beneficial ownership and does not qualify for the short-form 13G must file a 13D. In practice, 13D is most closely associated with activist investors — those who acquire large stakes with the intent to influence or change company management, strategy, or structure.
Filing Deadline
Under the current rules (effective February 2024), Schedule 13D must be filed within 5 business days of the date the person crosses the 5% threshold. Prior to the 2024 amendments, the deadline was 10 calendar days.
What Must Be Disclosed
Schedule 13D requires extensive disclosure across seven items:
| Item | Disclosure |
|---|---|
| Item 1: Security and Issuer | The class of equity securities and the name and address of the issuer |
| Item 2: Identity and Background | Name, residence or business address, citizenship, and — for individuals — present principal occupation and any criminal convictions in the past five years involving fraud or securities violations |
| Item 3: Source and Amount of Funds | Where the money came from to acquire the shares — personal funds, borrowed funds, partnership capital, etc. If borrowed, the terms and identity of the lender |
| Item 4: Purpose of Transaction | The filer's plans or proposals regarding the issuer — this is the most closely watched item in any 13D |
| Item 5: Interest in Securities | The number of shares and percentage of the class beneficially owned, including shares held by associates or through derivatives |
| Item 6: Contracts, Arrangements | Any contracts, arrangements, understandings, or relationships with respect to the issuer's securities — joint venture agreements, lock-up agreements, voting arrangements |
| Item 7: Material to Be Filed as Exhibits | Copies of written agreements, letters, and other documents referenced in the filing |
Item 4: Purpose of Transaction
Item 4 is the heart of a 13D filing. This is where the filer discloses whether they intend to:
- Seek representation on the company's board of directors
- Propose or oppose a merger, acquisition, or other extraordinary corporate transaction
- Advocate for changes in management or business strategy
- Propose changes to the company's capitalisation, dividend policy, or corporate structure
- Seek the sale or transfer of a material amount of the issuer's assets
- Take any other action that could result in a change of control
Researchers and market participants closely read Item 4 language — a filing stating the filer "may seek board representation" carries very different informational content than one stating shares were "acquired for investment purposes."
Amendment Requirements
Schedule 13D must be amended "promptly" — which the SEC has generally interpreted as within two business days — whenever a material change occurs. Material changes include:
- Any increase or decrease in beneficial ownership of 1% or more
- A change in the purpose of the transaction (e.g., shifting from passive investment to seeking board seats)
- Changes to funding sources, agreements, or arrangements
This ongoing amendment requirement means that 13D is a living document. An activist campaign that unfolds over months will generate a series of 13D/A amendments, each updating the market on the filer's evolving position and intentions.
In January 2022, Third Point LLC filed a Schedule 13D disclosing economic exposure above 5% in The Walt Disney Company. Item 4 stated that Third Point intended to engage with Disney's management and board regarding strategic and operational matters. This example illustrates how Item 4 language indicates the filer's intent — it is referenced here to show the structure of a 13D, not as commentary on any outcome.
Schedule 13G: The Passive Disclosure
Schedule 13G is the short-form alternative to 13D. It is available only to investors who meet specific eligibility criteria and who certify that their holdings are passive — they have no purpose or effect of changing or influencing control of the issuer.
Who Can File 13G
Three categories of investors are eligible to use Schedule 13G:
Qualified Institutional Investors (QIIs) — banks, broker-dealers, insurance companies, registered investment advisers, employee benefit plans, and similar institutional entities. QIIs must certify that they hold the securities in the ordinary course of business with no purpose of changing or influencing control.
Passive Investors — any person who beneficially owns more than 5% but less than 20% and can certify passive intent. If holdings reach 20%, they must switch to 13D.
Exempt Investors — persons who already held more than 5% when the securities class was registered, or who crossed 5% through certain exempt transactions. This category is narrow.
What 13G Requires
Schedule 13G has substantially fewer disclosure requirements than 13D:
| Field | Required on 13G |
|---|---|
| Identity of filer | Yes |
| Number of shares and percentage owned | Yes |
| Certification of passive intent | Yes |
| Source and amount of funds | Limited |
| Purpose of transaction | Not required (passive intent is implicit in the eligibility certification) |
| Background information on individuals | Not required |
| Contracts and arrangements | Not required |
The absence of Item 4 (Purpose of Transaction) is the most significant difference. A 13G confirms the existence of a large position but provides far less information about why it exists or what the holder plans to do.
Filing Deadlines (Post-2024 Amendments)
The 2024 amendments significantly accelerated 13G filing deadlines:
- QIIs: Must file within 45 calendar days after the end of the calendar quarter in which beneficial ownership exceeds 5%. Amendments are due within 45 days after the end of the quarter in which a material change occurs (including crossing the 10% threshold)
- Passive Investors: Must file within 5 business days of crossing the 5% threshold. Amendments are due promptly upon any material change
- Exempt Investors: Must file within 45 calendar days after the end of the calendar year in which the event triggering the filing occurs
13D vs 13G: Key Differences
| Schedule 13D | Schedule 13G | |
|---|---|---|
| Who uses it | Anyone crossing 5% who does not qualify for 13G — typically activist investors, corporate acquirers, individuals | QIIs, passive investors (under 20%), exempt investors |
| Intent | May include activist or change-of-control intent | Must certify passive intent — no purpose of changing or influencing control |
| Filing deadline | 5 business days after crossing 5% | Varies by category: 45 days after quarter-end (QIIs), 5 business days (passive), 45 days after year-end (exempt) |
| Purpose disclosure (Item 4) | Required — must describe plans regarding the issuer | Not required — passive intent is implicit |
| Background disclosure | Required — identity, occupation, criminal history | Limited — identity and ownership details only |
| Source of funds | Required — must disclose where acquisition funds came from | Limited disclosure |
| Amendment triggers | Promptly upon material change, including 1%+ ownership change | Varies by category — generally upon material change or crossing 10% |
| Ownership cap | No cap | Passive investors must switch to 13D if ownership reaches 20% |
Switching from 13G to 13D
The passive certification on a 13G is not irrevocable. If a 13G filer later decides to pursue an activist agenda — seeking board seats, proposing a merger, lobbying for strategic changes — they must convert their 13G to a 13D within 10 calendar days of forming that intent. During those 10 days, the filer may not vote or direct the voting of the securities.
In practice, the 13G-to-13D conversion itself is a closely watched event, as it indicates a shift from passive holding to active engagement.
The 2024 SEC Amendments
In October 2023, the SEC adopted substantial amendments to the beneficial ownership reporting rules, effective February 5, 2024 — the most significant changes since the Williams Act of 1968.
Key Changes
Shortened 13D filing deadline. Reduced from 10 calendar days to 5 business days. The SEC determined the original window, designed for paper filings, was no longer appropriate.
Accelerated 13G deadlines. QIIs and exempt investors moved from annual to quarterly deadlines. Passive investors moved from 10 calendar days to 5 business days.
Expanded group definition. The amendments clarified when communications or arrangements between shareholders could trigger group formation and the obligation to aggregate holdings.
Structured XML requirement. All Schedules 13D and 13G must now be filed using machine-readable XML, replacing the previous unstructured text format.
Derivatives disclosure. Certain derivative positions — including cash-settled swaps providing economic exposure to the underlying equity — must now be disclosed as part of the beneficial ownership analysis.
The move to structured XML is particularly significant for data analysis — prior to 2024, these filings were unstructured text documents requiring manual parsing. The XML format provides standardised fields for ownership amounts, dates, and filer identification, making the filings far more amenable to systematic processing.
How Akivus Uses This Data
Akivus processes Schedule 13D and 13G filings through the Thesma API platform, which extracts structured ownership data from the XML filings and makes it available across Akivus products.
Important limitation: Akivus's 13D/13G coverage is limited to filings made after December 2024. This is due to a Thesma XML parser limitation — the system currently processes only the structured XML format mandated by the 2024 SEC amendments. Filings made before this date, which used the older unstructured text format, are not in the Akivus system. As a result, Akivus does not provide historical 13D/13G data prior to this cutoff.
Within its coverage window, Akivus surfaces 13D/13G data in several products:
- Akivus Reports include a section on significant ownership activity for each Russell 3000 company, incorporating 13D and 13G filings alongside Form 4 insider transactions and 13F institutional holdings. When a 13D is filed against a company, the report notes the filer's identity, reported ownership percentage, and disclosed purpose — providing context on whether the position appears to be activist or passive in nature
- Akivus Briefs — company summary pages at
/companies/[ticker]— surface recent 13D/13G activity to give a quick view of any concentrated ownership developments - Akivus Alerts notify subscribers when new 13D or 13G filings are detected for companies they follow
In each case, Akivus presents the factual content of the SEC filings with added context — describing what was disclosed and how it relates to other filings, without characterising holdings as positive or negative developments.