{"schema_version":"secwatch.filing_event.v1","accession":"0001213900-26-067269","form_type":"8-K","ticker":"KEYY","cik":"0002102771","company_name":"Keystone Acquisition Corp.","filed_at":"2026-06-10T19:08:07+00:00","discovered_at":"2026-06-10T19:09:00.282337+00:00","generated_at":"2026-06-10T19:09:13.171396+00:00","sec_items":["8.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.75,"calibrated_materiality_score":0.75,"confidence":"high","headline":"Keystone Acquisition Corp. closes $287.5M IPO and $8.5M private placement","bullets":["IPO of 28,750,000 units at $10.00/unit raised $287.5M gross.","Private placement of 8,468,750 warrants at $1.00 each raised $8.47M.","$288.2M placed in trust account at $10.025 per unit.","Transaction costs totaled $17.87M including $11.5M deferred underwriting.","As of June 4, 2026, working capital outside trust was $1.26M."],"urls":{"canonical":"https://secwatch.observer/filing/0001213900-26-067269","json":"https://secwatch.observer/filing/0001213900-26-067269.json","markdown":"https://secwatch.observer/filing/0001213900-26-067269.md","text":"https://secwatch.observer/filing/0001213900-26-067269.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026067269/0001213900-26-067269-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026067269/ea0294122-8k_keystone.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-10T19:09:13.171396+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}