Item 5. Other Information
Item 5. Other Information
During the quarterly period ended June 30, 2026, none of our directors or officers adopted or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement” (each as defined in Items 408(a) and 408(c) of Regulation S-K), respectively.
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Item 6. Exhibits
No. Description of Exhibit
1.1 Underwriting Agreement, dated June 2, 2026, by and between the Company and the Representatives. (1)
3.1 Amended and Restated Memorandum and Articles of Association. (1)
4.1 Warrant Agreement, dated June 2, 2026, by and between the Company and Efficiency INC., as warrant agent. (1)
10.1 Letter Agreement, dated June 2, 2026, by and among the Company, its executive officers, its directors, its advisors and the Sponsor. (1)
10.2 Investment Management Trust Agreement, dated June 2, 2026, by and between the Company and Efficiency INC., as trustee. (1)
10.3 Registration Rights Agreement, dated June 2, 2026, by and among the Company, the Sponsor and the Holders signatory thereto. (1)
10.4 Private Placement Warrants Purchase Agreement, dated June 2, 2026, by and between the Company and the Sponsor. (1)
10.5 Private Placement Warrants Purchase Agreement, dated June 2, 2026, by and between the Company and the Underwriters. (1)
10.6 Administrative Services and Indemnification Agreement, dated June 2, 2026, by and between the Company and the Sponsor. (1)
31.1* Certification of Principal Executive Officer Pursuant to Securities Exchange Act Rules 13a-14(a), as adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2* Certification of Principal Financial Officer Pursuant to Securities Exchange Act Rules 13a-14(a), as adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1^ Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2^ Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS Inline XBRL Instance Document.
101.SCH Inline XBRL Taxonomy Extension Schema Document.
101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document.
101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document.
104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).
* Filed herewith.
^ Exhibits 32.1 and 32.2 and the XBRL related information in Exhibit 101 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liability of that section and shall not be incorporated by reference into any filing or other document pursuant to the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing or document.
(1) Previously filed as an exhibit to our Current Report on Form 8-K filed on June 8, 2026 and incorporated by reference herein.
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SIGNATURES
In accordance with the requirements of the Exchange Act, the registrant caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
KEYSTONE ACQUISITION CORP.
Date: August 13, 2026 By: /s/ Richard Chin
Name: Richard Chin
Title: Chief Executive Officer
(Principal Executive Officer)
Date: August 13, 2026 By: /s/ Jaiho (Jake) Cho
Name: Jaiho (Jake) Cho
Title: Chief Financial Officer
(Principal Financial Officer and Principal Accounting Officer)
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Text extracted from the filing as submitted to EDGAR. Formatting, tables and exhibits are simplified for reading; the original document is authoritative for anything you rely on.