Learn / 13d-vs-13g
13D vs. 13G: what's the difference?
Schedule 13D and Schedule 13G are two SEC filings disclosing ≥5% beneficial ownership of a public company's voting equity. The choice between them signals intent: 13D is for activists and any holder with intent to influence control; 13G is the short-form for passive holders.
Last updated: 2026-05-01. Source: SEC EDGAR.
Both disclose ≥5% beneficial ownership — the threshold is the same
Section 13(d) of the Securities Exchange Act of 1934 requires any person or group acquiring beneficial ownership of more than 5% of a class of registered voting equity to disclose the position. The disclosure can be made on either Schedule 13D or Schedule 13G, depending on who is filing and why.
When to use 13D — the long-form
Schedule 13D is the default — filed by anyone who doesn't qualify for short-form 13G treatment. In practice this means activists, control-seeking investors, and any holder whose intent is anything other than passive investment.
Filing window: within 5 business days of crossing 5%. (Tightened from 10 calendar days by SEC amendments effective February 2024.)
Items disclosed: identity, source of funds, purpose of transaction, plans or proposals (Item 4 — the most-read section), beneficial ownership detail, contracts/arrangements, exhibits.
Amendment trigger: any “material change” to the disclosure — including changes in ownership of 1% or more.
SecFilingDex tracks 3 SC 13D filings and 10 SC 13D/A amendments.
When to use 13G — the short-form
Schedule 13G is available to three categories of filer under SEC Rule 13d-1:
- Qualified Institutional Investors (Rule 13d-1(b)): registered broker-dealers, banks, investment advisers, registered investment companies. Must hold passively, in the ordinary course of business, and not with the purpose of influencing control.
- Passive Investors (Rule 13d-1(c)): any holder under 20% who certifies passive intent.
- Exempt Investors (Rule 13d-1(d)): holders who would qualify for passive status but for limited grandfathered ownership.
Filing window (post-Feb 2024): 45 days after the calendar quarter-end for institutional filers; 5 business days for non-institutional passive investors.
Amendment cadence: quarterly (institutional) or 5-business-day (passive), with materiality thresholds for early amendment.
SecFilingDex tracks 9 SC 13G filings and 10 SC 13G/A amendments.
The intent signal — why the choice matters
A holder transitioning from 13G to 13D is making a public, legally meaningful statement: “I am no longer passive.” Such transitions almost always precede activist campaigns, board pushes, M&A proposals, or other control-seeking activity.
The reverse — 13D filer transitioning to 13G after exit or de-escalation — also happens, but matters less to the market because the activist period is already in the price.
Comparison table
| Dimension | Schedule 13D | Schedule 13G |
|---|---|---|
| Threshold | ≥5% | ≥5% |
| Filer intent | Active / control-seeking | Passive |
| Initial deadline | 5 business days | 45 days from quarter-end (inst.) / 5 BD (passive) |
| Amendment trigger | Any material change | Quarterly + threshold |
| Item 4 plans? | Required, detailed | Not applicable |
Our view
The 13D-to-13G (or vice-versa) transition is one of the most reliable qualitative signals on EDGAR. Long-only managers who hold for years on a 13G and then switch to a 13D are telling you, on the record, that something changed in their thesis. Reading the Item 4 of the new 13D against the prior holdings rarely takes more than 20 minutes and almost always rewards the time.
Related
Glossary
- Schedule 13D
- SEC long-form ownership disclosure under Section 13(d) of the Exchange Act, filed by any person beneficially owning more than 5% of a class of registered voting equity who is not eligible for short-form 13G treatment.
- Schedule 13G
- SEC short-form ownership disclosure for passive 5%+ beneficial owners — qualified institutional investors, passive investors, and exempt investors as defined under Rule 13d-1.
- Beneficial ownership
- The right to vote or direct the vote, or to dispose or direct the disposition, of a security. SEC Rule 13d-3 defines beneficial ownership broadly to include certain options and rights to acquire.
- Item 4
- Schedule 13D Item 4 — Purpose of Transaction. Where the filer must disclose plans or proposals relating to changes in management, board, capital structure, or other extraordinary transactions.