{"url_path":"/sec/keyy/8-k/2026-06-08/item-9-01","section_key":"item-9-01","section_title":"Item 9.01 Financial Statements and Exhibits.**","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-06-08","source_url":"https://www.sec.gov/Archives/edgar/data/2102771/0001213900-26-066255-index.html","accession_number":"0001213900-26-066255","cik":"0002102771","ticker":"KEYY","issuer_name":"Keystone Acquisition Corp.","edgar_url":"https://www.sec.gov/Archives/edgar/data/2102771/0001213900-26-066255-index.html","primary_entity_key":"0002102771","primary_entity_name":"Keystone Acquisition Corp."},"word_count":245,"has_tables":true,"body_markdown":"** **\n\n**Item 9.01 Financial Statements and Exhibits.**\n\n \n\n(d) Exhibits\n\n \n\n**EXHIBIT INDEX**\n\n \n\n**Exhibit No.**\n \n**Description**\n\n1.1\n \n[Underwriting Agreement, dated June 2, 2026, by and between the Company and the Representatives.](ea029389901ex1-1.htm)\n\n3.1\n \n[Amended and Restated Memorandum and Articles of Association.](ea029389901ex3-1.htm)\n\n4.1\n \n[Warrant Agreement, dated June 2, 2026, by and between the Company and Efficiency, as warrant agent.](ea029389901ex4-1.htm)\n\n10.1\n \n[Letter Agreement, dated June 2, 2026, by and among the Company, its executive officers, its directors, its advisors and the Sponsor.](ea029389901ex10-1.htm)\n\n10.2\n \n[Investment Management Trust Agreement, dated June 2, 2026, by and between the Company and Efficiency, as trustee.](ea029389901ex10-2.htm)\n\n10.3\n \n[Registration Rights Agreement, dated June 2, 2026, by and among the Company, the Sponsor and the Holders signatory thereto.](ea029389901ex10-3.htm)\n\n10.4\n \n[Private Placement Warrants Purchase Agreement, dated June 2, 2026, by and between the Company and the Sponsor.](ea029389901ex10-4.htm)\n\n10.5\n \n[Private Placement Warrants Purchase Agreement, dated June 2, 2026, by and between the Company and the Underwriters.](ea029389901ex10-5.htm)\n\n10.6\n \n[Administrative Services and Indemnification Agreement, dated June 2, 2026, by and between the Company and the Sponsor.](ea029389901ex10-6.htm)\n\n99.1\n \n[Press Release, dated June 2, 2026.](ea029389901ex99-1.htm)\n\n99.2\n \n[Press Release, dated June 4, 2026.](ea029389901ex99-2.htm)\n\n104\n \nCover Page Interactive Data File (embedded within the Inline XBRL document).\n\n \n\n3\n\n \n\n \n\n**SIGNATURE**\n\n \n\nPursuant to the requirements\nof the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto\nduly authorized.\n\n \n\n \n**KEYSTONE ACQUISITION CORP.**\n\n \n \n \n\n \nBy: \n/s/ Richard Chin\n\n \n \nName: \nRichard Chin\n\n \n \nTitle:\nChief Executive Officer\n\n \n \n \n\nDated: June 8, 2026\n \n \n\n \n\n4"}