# EDGAR Filing Document

**Accession Number:** 0001834526
**File Stem:** 0001213900-26-056070
**Filing Date:** 2026-5
**Character Count:** 23208
**Document Hash:** 07a2a9e8db050e082aba31356d1fe862
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-26-056070.hdr.sgml**: 20260514

**ACCESSION NUMBER**: 0001213900-26-056070

**CONFORMED SUBMISSION TYPE**: 425

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260514

**DATE AS OF CHANGE**: 20260513

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GP-Act III Acquisition Corp.
- **CENTRAL INDEX KEY:** 0001834526
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 425
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42046
- **FILM NUMBER:** 26975219

**BUSINESS ADDRESS:**
- **STREET 1:** 300 PARK AVENUE, 2ND FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 430-4340

**MAIL ADDRESS:**
- **STREET 1:** 300 PARK AVENUE, 2ND FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GP Investments Acquisition Corp. II
- **DATE OF NAME CHANGE:** 20201202
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GP-Act III Acquisition Corp.
- **CENTRAL INDEX KEY:** 0001834526
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 425

**BUSINESS ADDRESS:**
- **STREET 1:** 300 PARK AVENUE, 2ND FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** (212) 430-4340

**MAIL ADDRESS:**
- **STREET 1:** 300 PARK AVENUE, 2ND FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GP Investments Acquisition Corp. II
- **DATE OF NAME CHANGE:** 20201202

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**PURSUANT TO SECTION 13 OR 15(D)**

**OF THE SECURITIES EXCHANGE ACT OF 1934**

**Date of Report (Date of earliest event reported): May 13, 2026**

**GP-Act III Acquisition Corp.**

**(Exact name of registrant as specified in its charter)**

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| | | |
|:---|:---|:---|
| **Cayman Islands** | **001-42046** | **N/A** |
| **(State or other jurisdiction** | **(Commission File Number)** | **(I.R.S. Employer** |
| **of incorporation)** |  | **Identification No.)** |

---

---

| | |
|:---|:---|
| **300 Park Avenue** **, 2nd Floor,<br> New York, New York** | **10022** |
| **(Address of principal executive offices)** | **(Zip Code)** |

---

**+1 (212) 430-4340**

**(Registrant's telephone number, including area code)**

**Not Applicable**

**(Former name or former address, if changed since last report)**

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☒ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading<br> Symbol(s)** | **Name of each exchange<br> on which registered** |
| **Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant** | **GPATU** | **The Nasdaq Stock Market LLC** |
| **Class A ordinary shares, par value $0.0001 per share** | **GPAT** | **The Nasdaq Stock Market LLC** |
| **Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50** | **GPATW** | **The Nasdaq Stock Market LLC** |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

**Item 1.01 Entry into a Material Definitive Agreement.**

**Non-Redemption Agreements** 

As previously disclosed in a Current Report on Form 8-K filed by GP-Act III Acquisition Corp., a Cayman Islands exempted company (the "Company"), with the U.S. Securities and Exchange Commission (the "SEC") on May 12, 2026, the Company and GP-Act III Sponsor LLC, the Company's sponsor ("Sponsor HoldCo"), entered into agreements (collectively, the "Non-Redemption Agreements") with one or more third-party shareholders of the Company (each, an "Investor") in exchange for such Investors agreeing (i) not to redeem (or to validly rescind any redemption requests previously made in respect of), and (ii) to vote or consent (in person or by proxy) in favor of the Extension Amendment (as defined below) and the Trust Amendment (as defined below), with respect to an aggregate of 8,074,387 of the Company's Class A ordinary shares, par value $0.0001 per share (the "Class A ordinary shares"), at the Extraordinary General Meeting (as defined below).

Pursuant to the Non-Redemption Agreements, Sponsor HoldCo has agreed to transfer to such Investors an aggregate of 403,720 Class A ordinary shares of the Company promptly following the closing of the Company's initial business combination, conditional on, among other matters, (i) such Investors not exercising (or having validly rescinded any prior exercise of) their redemption rights with respect to the Non-Redeemed Shares in connection with the Extraordinary General Meeting, (ii) such Investors voting or consenting in favor of the Extension Amendment and the Trust Amendment at the Extraordinary General Meeting and (iii) the Extension Amendment and the Trust Amendment being approved at the Extraordinary General Meeting.

The foregoing summary of the Non-Redemption Agreements does not purport to be complete and is qualified in its entirety by reference to the form of Non-Redemption Agreement, a copy of which was filed as Exhibit 10.1 to the Company's Current Report on Form 8-K filed with the SEC on May 12, 2026 and is incorporated herein by reference.

On May 12, 2026, in connection with the Extraordinary General Meeting (as defined below), GP-Act III Acquisition Corp. (the "Company") and Continental Stock Transfer & Trust Company (the "Trustee") entered into Amendment No. 1 to the Investment Management Trust Agreement, dated as of May 8, 2024, to (i) extend the date before which the Company must complete a business combination (as defined below) from May 13, 2026 to November 13, 2026 and (ii) extend the date on which the Trustee must liquidate the trust account established in connection with the Company's initial public offering if the Company has not completed its initial business combination from May 13, 2026 to November 13, 2026 (the "Trust Amendment"). A copy of the Trust Amendment is attached to this Current Report on Form 8-K as Exhibit 10.1 and incorporated herein by reference.

**Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.**

The information disclosed in Item 5.07 of this Current Report on Form 8-K is incorporated by reference into this Item 5.03 to the extent required herein.

**Item 5.07 Submission of Matters to a Vote of Security Holders.**

On April 29, 2026, the Company convened its extraordinary general meeting of shareholders (the "Extraordinary General Meeting") and, following the approval by the shareholders of a proposal to adjourn the Extraordinary General Meeting, adjourned the Extraordinary General Meeting to May 6, 2026. The extraordinary general meeting of shareholders was adjourned again to May 12, 2026. Each adjournment proposal was approved at the respective session of the Extraordinary General Meeting, and the voting results in respect thereof were disclosed in the Company's Current Reports on Form 8-K filed with the Securities and Exchange Commission on April 29, 2026 and on May 6, 2026.

At the Extraordinary General Meeting, which was reconvened on May 12, 2026, holders of 30,864,730 of the Company's ordinary shares, which represents approximately 85.88% of the ordinary shares outstanding and entitled to vote as of the record date of March 24, 2026, were represented in person or by proxy.

At the Extraordinary General Meeting, the shareholders approved (1) a special resolution to amend the Amended and Restated Memorandum and Articles of Association of the Company (the "Extension Amendment") to extend the date by which the Company must (a) consummate a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (a "business combination"), (b) cease its operations except for the purpose of winding up if it fails to complete such business combination, and (c) redeem all of the Company's Class A ordinary shares included as part of the units sold in the Company's initial public offering, from May 13, 2026 to November 13, 2026, and (2) the proposals for the Trust Amendment. A copy of the Extension Amendment is attached to this Current Report on Form 8-K as Exhibit 3.1 and incorporated herein by reference.

Approval of Extension Amendment

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| | | |
|:---|:---|:---|
| **Votes For** | **Votes Against** | **Abstentions** |
| 23799592 | 7065138 | 0 |

---

Approval of Trust Amendment

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| | | |
|:---|:---|:---|
| **Votes For** | **Votes Against** | **Abstentions** |
| 23799592 | 7065138 | 0 |

---

In connection with the vote to approve the Extension Amendment, the holders of 19,776,272 Class A ordinary shares properly exercised their right to redeem their shares for cash at a redemption price of approximately $10.89 per share, for an aggregate redemption amount of approximately $215,421,832, leaving approximately $97,750,320 in the trust account.

The information included in Item 1.01 of this Current Report on Form 8-K is incorporated by reference into this Item 5.07 to the extent required herein.

**Item 9.01 Financial Statements and Exhibits**

(d) Exhibits

---

| | |
|:---|:---|
| 3.1 | [Amendments to Amended and Restated Memorandum and Articles of Association of GP-Act III Acquisition Corp.3](ea029015501ex3-1.htm) |
| 10.1 | [Amendment No. 1, dated as of May 12, 2026 to the Investment Management Trust Agreement, dated as of May 8, 2024, by and between Company and Continental Stock Transfer & Trust Company, as trustee](ea029015501ex10-1.htm) |
| 10.2\* | [Form of Non-Redemption Agreement (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed with the SEC on May 12, 2026)](https://www.sec.gov/ix?doc=/Archives/edgar/data/1834526/000121390026055248/ea0290156-8k_gpact3.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

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\* Certain schedules and similar attachments have been omitted in reliance on Instruction 4 Item 1.01 of Form 8-K.

**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | | | |
|:---|:---|:---|:---|
|  | **GP-Act III Acquisition Corp.** | **GP-Act III Acquisition Corp.** | **GP-Act III Acquisition Corp.** |
| Date: May 13, 2026 | By: | /s/ Rodrigo Boscolo | /s/ Rodrigo Boscolo |
|  |  | Name: | Rodrigo Boscolo |
|  |  | Title: | Chief Financial Officer<br> (Principal Financial and Accounting Officer) |

---

## Exhibit 3.1

**Exhibit 3.1**

**AMENDMENTS<br> TO THE<br> AMENDED AND RESTATED<br> MEMORANDUM AND ARTICLES OF ASSOCIATION<br> OF<br> GP-ACT III ACQUISITION CORP.** 

GP-ACT III ACQUISITION CORP.<br> (the "Company")<br> RESOLUTIONS OF THE SHAREHOLDERS OF THE COMPANY

It is resolved as a special resolution THAT, effective immediately, the Amended and Restated Memorandum and Articles of Association of the Company be amended by:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) amending Article 49.9 by deleting the following introduction of such sub-section:

"In the event that the Company does not consummate a Business Combination within 24 months from the consummation of the IPO, or such later time as the Members may approve in accordance with the Articles, the Company shall:"

and replacing it with the following:

"In the event that the Company does not consummate a Business Combination by November 13, 2026, or such later time as the Members may approve in accordance with the Articles, the Company shall:"; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) amending Article 49.10 by deleting the words:

"within 24 months from the consummation of the IPO"

and replacing them with the words:

"by November 13, 2026".

## Exhibit 10.1

**Exhibit 10.1**

**AMENDMENT NO. 1 TO INVESTMENT MANAGEMENT TRUST AGREEMENT**

THIS AMENDMENT NO. 1 TO THE INVESTMENT MANAGEMENT TRUST AGREEMENT (this "**Amendment**") is made as of May 12, 2026, by and between GP-Act III Acquisition Corp., a Cayman Islands exempted company (the "**Company**"), and Continental Stock Transfer & Trust Company, a New York corporation (the "**Trustee**"). Capitalized terms contained in this Amendment, but not specifically defined in this Amendment, shall have the meanings ascribed to such terms in the Original Agreement (as defined below).

WHEREAS, on May 13, 2024, the Company consummated an initial public offering (the "**Offering**") of units of the Company, each of which is composed of one of the Company's Class A ordinary shares, par value $0.0001 per share ("**Ordinary Shares**"), and one-half of one warrant, each whole warrant entitling the holder thereof to purchase one Ordinary Share;

WHEREAS, $287,500,000 of the gross proceeds of the Offering and sale of the Private Placement Warrants (as defined in the Underwriting Agreement) were delivered to the Trustee to be deposited and held in the segregated Trust Account located in the United States for the benefit of the Company and the holders of Ordinary Shares included in the Units issued in the Offering pursuant to the investment management trust agreement made effective as of May 8, 2024, by and between the Company and the Trustee (the "**Original Agreement**");

WHEREAS, the Company has sought the approval of the holders of its Ordinary Shares and holders of its Class B ordinary shares, par value $0.0001 per share (the "**Class B Ordinary Shares**"), at an extraordinary general meeting to: (i) extend the date before which the Company must complete a business combination from May 13, 2026 to November 13, 2026 (the "**Extension Amendment**") and (ii) extend the date on which the Trustee must liquidate the Trust Account if the Company has not completed its initial business combination from May 13, 2026 to November 13, 2026 (the "**Trust Amendment**");

WHEREAS, holders of at least two-thirds of the then issued and outstanding Ordinary Shares and Class B Ordinary Shares, voting together as a single class, being present and entitled to vote at the extraordinary general meeting, approved the Extension Amendment, and holders of at least sixty-five percent (65%) of the then issued and outstanding Ordinary Shares and Class B Ordinary Shares, voting together as a single class, approved the Trust Amendment; and

WHEREAS, the parties desire to amend the Original Agreement to, among other things, reflect amendments to the Original Agreement contemplated by the Trust Amendment.

NOW, THEREFORE, in consideration of the mutual agreements contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and intending to be legally bound hereby, the parties hereto agree as follows:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. *Amendments to Trust Agreement*. Section 1(i) of the Original Agreement is hereby amended and restated in its entirety as follows:

""(i) Commence liquidation of the Trust Account only after and promptly after (x) receipt of, and only in accordance with, the terms of a letter from the Company ("**Termination Letter**") in a form substantially similar to that attached hereto as either Exhibit A or Exhibit B, jointly signed on behalf of the Company by its Chief Executive Officer, President, Chief Financial Officer, Chief Operating Officer, General Counsel, Secretary or a Co-Chairman of the board of directors of the Company (the "**Board**") or other authorized officer of the Company, and, in the case of Exhibit A, acknowledged an agreed to by Cantor, and complete the liquidation of the Trust Account and distribute the Property in the Trust Account, including interest (less up to $100,000 of interest that may be released to the Company to pay dissolution expenses and which interest shall be net of any taxes payable, it being understood that the Trustee has no obligation to monitor or question the Company's position that an allocation has been made for taxes payable), only as directed in the Termination Letter and the other documents referred to therein; *provided* that, in the case a Termination Letter in the form of Exhibit A is received, or (y) upon the date which is the later of (A) November 13, 2026, and (B) such later date as may be approved by the Company's shareholders in accordance with the Company's amended and restated memorandum and articles of association, as it may be amended from time to time, if a Termination Letter has not been received by the Trustee prior to such date, in which case the Trust Account shall be liquidated in accordance with the procedures set forth in the Termination Letter attached as Exhibit B and the Property in the Trust Account, including interest (less up to $100,000 of interest that may be released to the Company to pay dissolution expenses and which interest shall be net of any taxes payable), shall be distributed to the Public Shareholders of record as of such date;".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.2. Section 1(k) of the Original Agreement is hereby amended and restated in its entirety as follows:

"Upon written request from the Company, which may be given from time to time in a form substantially similar to that attached hereto as Exhibit D (a "**Shareholder Redemption Withdrawal Instruction**"), the Trustee shall distribute on behalf of the Company the amount requested by the Company to be used to redeem Ordinary Shares from Public Shareholders properly submitted in connection with a shareholder vote to approve an amendment to the Company's amended and restated memorandum and articles of association (A) to modify the substance or timing of the Company's obligation to allow redemption in connection with the Company's initial merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination involving the Company and one or more businesses (a "**Business Combination**") or to redeem 100% of the Company's public shares if it does not complete its initial Business Combination by November 13, 2026 or (B) with respect to any other provision relating to shareholders' rights or pre-initial Business Combination activity. The written request of the Company referenced above shall constitute presumptive evidence that the Company is entitled to distribute said funds, and the Trustee shall have no responsibility to look beyond said request; and".

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. *Miscellaneous Provisions*.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.1. *Successors*. All the covenants and provisions of this Amendment by or for the benefit of the Company or the Trustee shall bind and inure to the benefit of their permitted respective successors and assigns.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.2. *Severability*. This Amendment shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall not affect the validity or enforceability of this Amendment or of any other term or provision hereof. Furthermore, in lieu of any such invalid or unenforceable term or provision, the parties hereto intend that there shall be added as a part of this Amendment a provision as similar in terms to such invalid or unenforceable provision as may be possible and be valid and enforceable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.3. *Applicable Law*. This Amendment shall be governed by and construed and enforced in accordance with the laws of the State of New York.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.4. *Counterparts*. This Amendment may be executed in several original or facsimile counterparts, each of which shall constitute an original, and together shall constitute but one instrument.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.5. *Effect of Headings*. The section headings herein are for convenience only and are not part of this Amendment and shall not affect the interpretation thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.6. *Entire Agreement*. The Original Agreement, as modified by this Amendment, constitutes the entire understanding of the parties and supersedes all prior agreements, understandings, arrangements, promises and commitments, whether written or oral, express or implied, relating to the subject matter hereof, and all such prior agreements, understandings, arrangements, promises and commitments are hereby canceled and terminated.

 

*[Signature page follows]*

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of the date first above written.

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| | | |
|:---|:---|:---|
| Continental Stock Transfer & Trust Company, as Trustee | Continental Stock Transfer & Trust Company, as Trustee | Continental Stock Transfer & Trust Company, as Trustee |
| By: |  |  |
|  | Name: | Francis Wolf |
|  | Title: | Vice President |

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*[Signature Page to Amendment No. 1 to Investment Management Trust Agreement]*

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of the date first above written.

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| | | |
|:---|:---|:---|
| GP-Act III Acquisition Corp. | GP-Act III Acquisition Corp. | GP-Act III Acquisition Corp. |
| By: |  |  |
|  | Name: | Rodrigo Boscolo |
|  | Title: | Chief Financial Officer (Principal Financial and Accounting Officer) |

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*[Signature Page to Amendment No. 1 to Investment Management Trust Agreement]*