KEYY Keystone Acquisition Corp.

NEUTRAL Impact: 2/10 3
Horizon immediate Filed Jun 3, 2026 Processed 12d 7h ago SEC 0001213900-26-064389
Form 3 — initial insider ownership statement

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Executive Summary

Martin Payne filed a Form 3 initial statement of beneficial ownership with Keystone Acquisition Corp. (KEY), a blank-check company, reporting 35,000 Class A Ordinary Shares held directly. The filing is a routine insider ownership disclosure with no material financial impact.

Actionable Insight

This is a standard Form 3 filing for a newly appointed insider at a SPAC. No trading signal — monitor for future Form 4 filings or a business combination announcement for material impact.

Key Facts

  • Martin Payne filed Form 3 on 2026-06-02, reporting beneficial ownership of 35,000 Class A Ordinary Shares of Keystone Acquisition Corp.
  • Payne also holds an undisclosed number of Class B Ordinary Shares (reported as 0 in the filing, but convertible into Class A shares per the S-1).
  • The filing includes a Power of Attorney appointing multiple attorneys-in-fact for SEC filing purposes.
  • Keystone Acquisition Corp. is a blank-check company (SIC 6770) with no operating business yet.

Financial Impact

No financial data or material event disclosed; the filing is a routine initial ownership statement.

Risk Factors

  • No material risks identified from this filing alone.

Documents Analyzed

This report is based on 4 SEC documents filed with EDGAR.

DocumentAccession Number
3 Filing (Primary)0001213900-26-064389
Document: 0001213900-26-064389-index-headers.html0001213900-26-064389
Document: 0001213900-26-064389-index.html0001213900-26-064389
Document: 0001213900-26-064389.txt0001213900-26-064389
9 reports for KEYY
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Reports for KEYY — sortable, filterable
Type Now
Jun 5, 2026
10d ago
Press Release
NEUTRAL ★ 5/10
awaiting T+20
Jun 3, 2026
11d ago
424B4
NEUTRAL ★ 5/10
awaiting T+20
Jun 3, 2026
12d ago
EFFECT
NEUTRAL ★ 5/10
awaiting T+20
Jun 3, 2026
12d ago
3
NEUTRAL ★ 2/10
awaiting T+20
Jun 3, 2026
12d ago
3
NEUTRAL ★ 2/10
awaiting T+20
Jun 3, 2026
12d ago
3
NEUTRAL ★ 2/10
awaiting T+20
Jun 3, 2026
12d ago
3
NEUTRAL ★ 1/10
awaiting T+20
Jun 2, 2026
12d ago
Press Release
NEUTRAL ★ 4/10
awaiting T+20
May 28, 2026
17d ago
S-1/A
NEUTRAL ★ 5/10
awaiting T+20
Showing 9 of 9

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