Flash FinanceUS
Market closed S&P 5007,549.94+2.35% Nasdaq25,253.14+2.74% Dow 3052,389.75+2.15% Russell 20002,840.81+3.15% Nasdaq-10027,907.62+3.40% MidCap 4003,715.23+3.13% SmallCap 6001,722.37+2.89% VIX19.92-22.31% 10Y Yield4.86+0.10% Close of Nov 09, 2026
AI brief of an SEC Form 8-K · Keystone Acquisition Corp. (KEYY)

Keystone Acquisition Corp. closes $287.5 million IPO of 28.75 million units

Neutral Impact 3 of 5 financing Written later

Keystone Acquisition Corp., a blank check company, completed its initial public offering on June 4, 2026, selling 28,750,000 units at $10.00 each for gross proceeds of $287.5 million. The filing also includes an audited June 4 balance sheet showing $288.2 million held in a U.S. trust account, which will be returned to public shareholders if the company does not complete a business combination, so shareholders' funds are now held in trust pending a deal.

Key points

  • IPO closed June 4, 2026: 28,750,000 units at $10.00 per unit, including 3,750,000 units from the full exercise of the underwriters' over-allotment option.
  • Private placement of 8,468,750 warrants at $1.00 each raised $8.5 million, with the sponsor buying 5,593,750 warrants.
  • $288,218,750 ($10.025 per unit) was placed in a U.S. trust account with Efficiency INC. as trustee.
  • The company has until 21 months from the IPO closing to complete a business combination; transaction costs totaled $17.9 million.

The filing

CompanyKeystone Acquisition Corp. (KEYY)
Form8-K, current report
Filed with the SECJun 10, 2026, 3:08 PM ET
Accession number0001213900-26-067269

Items reported: 8.01 Other Events

Read the filing on SEC.gov ↗

Written by AI on Nov 9, 2026, 11:48 AM ET, from this filing only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on June 10, 2026.

Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.