Form 8-K12B Filings
SEC Form 8-K12B is a current report filing used to notify that a class of securities of a successor issuer is deemed registered under Section 12(b) of the Securities Exchange Act of 1934.
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| ID | Form | Filer Name | Filing Agent | Date | Actions |
|---|---|---|---|---|---|
| 21353232 | 8-K12B | Irhythm Technologies, Inc. | Toppan Merrill/fa | 01/12/2026 |
What Is SEC Form 8-K12B?
SEC Form 8-K12B is a specialized Form 8-K used to provide notice that a class of securities of a successor issuer is deemed to be registered pursuant to Section 12(b) of the Securities Exchange Act of 1934, typically by operation of Rule 12g-3 following a qualifying succession transaction, as reflected in the SEC’s EDGAR filing framework.
This form is generally filed in connection with corporate events such as mergers, reorganizations, holding company formations, or similar transactions where a successor issuer becomes subject to Exchange Act reporting and its securities are treated as registered under Section 12(b). It helps establish the successor issuer’s status for Exchange Act reporting purposes and aligns the public registration record with the successor issuer’s securities and governance documents.
Key elements typically found in SEC Form 8-K12B include:
- Name of the successor issuer and the class of securities covered
- Identification of the predecessor issuer and the succession transaction
- Statement that the securities are deemed registered under Section 12(b)
- Reference to Rule 12g-3 and the basis for successor issuer status
- Description of the securities and related rights, if included as an exhibit
- Incorporation by reference of charter documents, bylaws, or other exhibits
SEC Form 8-K12B Filing Deadlines
SEC Form 8-K12B is generally event-driven and filed when a successor issuer status and deemed registration position must be established in connection with a qualifying transaction, rather than on a recurring periodic schedule.
| Filing Stage | Timeline | Details |
| Transaction / Successor Event | Not applicable | Triggered by a qualifying succession transaction |
| Form 8-K12B Filing | As needed | Filed to provide notice of deemed registration under Section 12(b) |
| Deemed Registration Status | Not applicable | Reflects registration by operation of Rule 12g-3, as applicable |
| Ongoing Reporting | As needed | Successor issuer continues Exchange Act reporting as required |
Key Things to Know About Form 8-K12B Filing Rules
- Successor Issuer Notice Purpose: Form 8-K12B is used to document that a successor issuer’s securities are deemed registered under Section 12(b), typically in connection with a succession transaction.
- Event-Driven Filing: The form is generally filed as needed based on the facts and timing of the succession transaction, rather than on a fixed recurring deadline.
- Rule 12g-3 Relevance: The filing commonly references Rule 12g-3 as the basis for successor issuer status and the deemed registration treatment for the relevant class of securities.
- Exhibits and Incorporation by Reference: Filings often include or incorporate governing documents and a description of securities, which helps align the public record with the successor issuer’s capitalization and rights.
- Not a Periodic Report Substitute: Form 8-K12B does not replace periodic reporting obligations, and the successor issuer remains responsible for ongoing Exchange Act filings as applicable.
To monitor corporate transitions and successor issuer filings, our SEC Filing Insights helps you track filings, such as a recent 8-K12 B. Check our Full SEC filers list to view the full list of SEC filers.
