Keystone Acquisition Corp.

Overview

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• TickerKEYY on Nasdaq²
• IndustryBlank Checks²
• HeadquartersGrand Cayman, Cayman Islands²
• Incorporated inCayman Islands⁴
• Business address228 Park Avenue S Pmb 242627, New York, Ny 10003⁴
• Filer categoryNon-accelerated filer, Smaller reporting company, Emerging growth company⁴
• Legal formexempt company²
• LEI52990079BJ3JIJLKA207²
• StatusActive²
• LEI statusIssued and current²
• Registered addressc/o Maples Corporate Services Limited,PO Box 309, Ugland House, KY1-1104 Grand Cayman, Cayman Islands²
• Registered withGeneral Registry, 428693²

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Corporate structure

Keystone Acquisition Corp. sits at the top of its group. 1 entity, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); major holders from Schedules 13D and 13G. Each entity in the chart links to its source.

Leadership

Who has led Keystone Acquisition Corp., and when. Pick a name to see everywhere that person has worked.

• Chief financial officerJaiho Cho Jun 2, 2026 to now⁵

Timeline

1. Jun 18, 20268-K Other events⁹
2. Jun 10, 20268-K Other events¹⁰
3. Jun 8, 20268-K Entered a material agreement; Unregistered sale of shares; Executive or director change¹¹
4. Nov 28, 2025Founded Keystone Acquisition Corp. is founded²

Filings

22 filings to the SEC since October 2021: 1 quarterly reports, 3 major events, 6 insider forms, 2 large holders, 10 other. The latest 20:

1. Aug 13, 202610-Q QUARTERLY REPORT EDGAR
2. Aug 13, 2026SCHEDULE 13G EDGAR
3. Aug 13, 2026SCHEDULE 13G EDGAR
4. Jun 18, 20268-K CURRENT REPORT EDGAR
5. Jun 10, 20268-K CURRENT REPORT EDGAR
6. Jun 8, 20268-K CURRENT REPORT EDGAR
7. Jun 3, 2026424B4 PROSPECTUS EDGAR
8. Jun 2, 2026EFFECT EDGAR
9. Jun 2, 2026CERT EDGAR
10. Jun 2, 20263 EDGAR
11. Jun 2, 20263 EDGAR
12. Jun 2, 20263 EDGAR
13. Jun 2, 20263 EDGAR
14. Jun 2, 20263 EDGAR
15. Jun 2, 20263 EDGAR
16. Jun 2, 20268-A12B FOR REGISTRATION OF CERTAIN CLASSES EDGAR
17. May 29, 2026CORRESP EDGAR
18. May 29, 2026CORRESP EDGAR
19. May 28, 2026S-1/A REGISTRATION STATEMENT EDGAR
20. May 4, 2026S-1 REGISTRATION STATEMENT EDGAR

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

Major holders

Investors who own more than 5% of the shares must tell the SEC: a 13D if they may seek to influence the company, a 13G if they hold passively.

• AQR CAPITAL MANAGEMENT LLCSCHEDULE 13G, 1 filing Aug 13, 2026¹²
• Magnetar Financial LLCSCHEDULE 13G, 1 filing Aug 13, 2026¹³

SEC filer profile

How Keystone Acquisition Corp. is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

• Name on EDGARKeystone Acquisition Corp.¹
• CIK0002102771
• Filer statusNon-accelerated filer<br>smaller reporting company<br>emerging growth company¹
• Incorporated inCayman Islands¹
• Fiscal year endsDecember 31¹
• Industry code (SIC)6770 Blank Checks¹
• SEC reviewing officeOffice of Real Estate & Construction, Division of Corporation Finance¹
• Business address228 Park Avenue S Pmb 242627, New York, NY 10003¹
• Phone9175730777¹
• On EDGAR sinceJan 23, 2026¹
• Filings22 in all: 3 (6), 8-K (3), CORRESP (2), SCHEDULE 13G (2), 10-Q (1), 424B4 (1), 8-A12B (1), CERT (1)¹
  All 13 form types

  DRS (1), EFFECT (1), S-1 (1), S-1/A (1), UPLOAD (1)

• Latest filingsQuarterly report (10-Q) Aug 13, 2026
  Latest 8-K (8-K) Jun 18, 2026