{"schema_version":"secwatch.filing_event.v1","accession":"0001213900-26-066255","form_type":"8-K","ticker":"KEYY","cik":"0002102771","company_name":"Keystone Acquisition Corp.","filed_at":"2026-06-08T19:37:22+00:00","discovered_at":"2026-06-08T19:38:00.397817+00:00","generated_at":"2026-06-08T19:38:28.490175+00:00","sec_items":["1.01","3.02","5.02","5.03","8.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.6,"calibrated_materiality_score":0.6,"confidence":"high","headline":"Keystone Acquisition Corp. closes $287.5M SPAC IPO, appoints John Boehner to board","bullets":["IPO of 28.75M units at $10.025/unit, including full over-allotment; gross proceeds $287.5M.","Concurrent private placement of 8.47M warrants at $1.00/warrant to sponsor and underwriters; trust funded $288.2M.","Target sectors: US industrial development (energy transition, critical minerals, shipbuilding, semiconductors, data centers, digital assets).","Board adds former Speaker John Boehner, Paul Cho, Martin Payne as independent directors; Boehner chairs Compensation Committee."],"urls":{"canonical":"https://secwatch.observer/filing/0001213900-26-066255","json":"https://secwatch.observer/filing/0001213900-26-066255.json","markdown":"https://secwatch.observer/filing/0001213900-26-066255.md","text":"https://secwatch.observer/filing/0001213900-26-066255.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026066255/0001213900-26-066255-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026066255/ea0293899-8k_keystone.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-08T19:38:28.490175+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":[{"claim_id":"db6d085e71250d6ca8184398f099b2eecce78bd2","claim":"Keystone Acquisition Corp. issued an aggregate of 8,468,750 warrants of warrant to the Sponsor and the Representatives for $1.00 per Private Placement Warrant.","evidence_excerpt":"On June 4, 2026, simultaneously with the closing of the IPO, pursuant to the Private Placement Warrants Purchase Agreements, the Company completed the private sale of an aggregate of 8,468,750 warrants (the “ Private Placement Warrants ”) to the Sponsor and the Representatives at a purchase price of $1.00 per Private Placement Warrant, generating gross proceeds to the Company of $8,468,750.","evidence_source":"SEC 8-K Item 3.02/3.03","evidence_url":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026066255/0001213900-26-066255-index.htm","confidence":0.9,"family_label":"Equity Issuances","details":[{"label":"Security","value":"warrant"},{"label":"Shares","value":"an aggregate of 8,468,750 warrants"},{"label":"Purchaser","value":"the Sponsor and the Representatives"},{"label":"Consideration","value":"$1.00 per Private Placement Warrant"}],"fact_type":"equity_issuance"},{"claim_id":"1a5fa3ccb5","claim":"John A. Boehner was appointed as Director at Keystone Acquisition Corp..","evidence_excerpt":"On June 2, 2026, in connection with the IPO, Speaker John A. Boehner, Paul Y. Cho and Martin Payne were appointed to the board of directors of the Company (the “ Board ”).","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026066255/0001213900-26-066255-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"1c05d2171b","claim":"Martin Payne was appointed as Director at Keystone Acquisition Corp..","evidence_excerpt":"On June 2, 2026, in connection with the IPO, Speaker John A. Boehner, Paul Y. Cho and Martin Payne were appointed to the board of directors of the Company (the “ Board ”).","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026066255/0001213900-26-066255-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"d33b203389","claim":"Paul Y. Cho was appointed as Director at Keystone Acquisition Corp..","evidence_excerpt":"On June 2, 2026, in connection with the IPO, Speaker John A. Boehner, Paul Y. Cho and Martin Payne were appointed to the board of directors of the Company (the “ Board ”).","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026066255/0001213900-26-066255-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"0b5ccde596e98afaebdb4d6236d6a714c05092cf","claim":"Keystone Acquisition Corp.: Adopted Amended and Restated Memorandum and Articles of Association in connection with IPO (effective 2026-06-02).","evidence_excerpt":"On June 2, 2026, in connection with the IPO, the Company adopted its Amended and Restated Memorandum and Articles of Association (the “ Amended Articles ”), effective the same day.","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/2102771/000121390026066255/0001213900-26-066255-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"charter amendment"},{"label":"Effective","value":"2026-06-02"}],"fact_type":"governance_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}