 ST. LOUIS--BUSINESS WIRE--Core Main, Inc. NYSE: CNM, a leading specialized distributor of water, wastewater, storm drainage and fire protection products, and related services, today announced the closing of the issuance of an additional 5,232,558 shares of its Class A common stock pursuant to the exercise in full of the underwriters over-allotment option in connection with Core Mains initial public offering IPO of Class A common stock. All of the additional shares of Class A 