# EDGAR Filing Document

**Accession Number:** 0002102771
**File Stem:** 9999999995-26-001846
**Filing Date:** 2026-6
**Character Count:** 1285
**Document Hash:** b71c3e53ceae66c5856c7bd767895fd6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-26-001846.hdr.sgml**: 20260603

**ACCESSION NUMBER**: 9999999995-26-001846

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260602

**DATE AS OF CHANGE**: 20260603

**EFFECTIVENESS DATE**: 20260602

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Keystone Acquisition Corp.
- **CENTRAL INDEX KEY:** 0002102771
- **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:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-295539
- **FILM NUMBER:** 261058770

**BUSINESS ADDRESS:**
- **STREET 1:** 228 PARK AVENUE S PMB 242627
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10003
- **BUSINESS PHONE:** 9175730777

**MAIL ADDRESS:**
- **STREET 1:** 228 PARK AVENUE S PMB 242627
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10003

### UNITED STATES
### SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## Notice of Effectiveness

**Date:** June 2, 2026

**Time:** 16:00:00

**Form Type:** S-1

---

**CIK:** 0002102771

**Company Name:** Keystone Acquisition Corp.

**File Number:** 333-295539