# EDGAR Filing Document

**Accession Number:** 0001838108
**File Stem:** 0001213900-25-068029
**Filing Date:** 2025-7
**Character Count:** 3489
**Document Hash:** 77589e9cd9f5e7fc531b4ef44bbaf710
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-25-068029.hdr.sgml**: 20250728

**ACCESSION NUMBER**: 0001213900-25-068029

**CONFORMED SUBMISSION TYPE**: 15-12G

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250728

**DATE AS OF CHANGE**: 20250728

**EFFECTIVENESS DATE**: 20250728

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** RMG Acquisition Corp. III
- **CENTRAL INDEX KEY:** 0001838108
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRICAL INDUSTRIAL APPARATUS [3620]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 15-12G
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-40013
- **FILM NUMBER:** 251154540

**BUSINESS ADDRESS:**
- **STREET 1:** 57 OCEAN, SUITE 403
- **STREET 2:** 5775 COLLINS AVENUE
- **CITY:** MIAMI BEACH
- **STATE:** FL
- **ZIP:** 33140
- **BUSINESS PHONE:** (786) 584-8352

**MAIL ADDRESS:**
- **STREET 1:** 57 OCEAN, SUITE 403
- **STREET 2:** 5775 COLLINS AVENUE
- **CITY:** MIAMI BEACH
- **STATE:** FL
- **ZIP:** 33140

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 15**

**CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934**

Commission File Number: 001-40013

**RMG ACQUISITION CORP. III**

(Exact name of registrant as specified in its charter)

**57 Ocean, Suite 403**

**5775 Collins Avenue**

**Miami Beach, Florida**

**(786) 359-4103**

(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

**Units, each consisting of one Class A ordinary share and one-fifth of one redeemable warrant**

**Class A ordinary shares included as part of the units**

**Redeemable warrants included as part of the units**

(Title of each class of securities covered by this Form)

**None**

(Titles of all other classes of securities for which a duty to file reports under section 13(a) or 15(d) remains)

Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to terminate or suspend the duty to file reports:

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| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rule 12g-4(a)(1) | ☒ |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rule 12g-4(a)(2) | ☐ |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rule 12h-3(b)(1)(i) | ☒ |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rule 12h-3(b)(1)(ii) | ☐ |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rule 15d-6 | ☐ |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rule 15d-22(b) | ☐ |

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Approximate number of holders of record as of the certification or notice date: None

Pursuant to the requirements of the Securities Exchange Act of 1934, RMG Acquisition Corp. III has caused this certification/notice to be signed on its behalf by the undersigned duly authorized person.

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| | | | |
|:---|:---|:---|:---|
|  | **RMG ACQUISITION CORP. III** | **RMG ACQUISITION CORP. III** | **RMG ACQUISITION CORP. III** |
| Date: July 28, 2025 | By: | /s/ Robert S. Mancini | /s/ Robert S. Mancini |
|  |  | Name: | Robert S. Mancini |
|  |  | Title: | Chief Executive Officer and Chairman |

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