The initial share sale of Concord Enviro Systems is set to hit Dalal Street with its maiden public issue on December 19 as it has filed a red herring prospectus (RHP) with the Registrar of Companies. This will be among six public issues opening for subscription next week. DAM Capital Advisors, Ventive Hospitality, Sanathan Textiles, Mamata Machinery, and Transrail Lighting are other five IPOs.