SigmaRoc, a building material company, agreed to acquire Nordkalk, a limestone producer, from Rettig, a Finnish family held investment company, for €500m ($591m). "Nordkalk is a well-established & well-respected business with a substantial asset footprint spanning across Northern Europe. It has a long history of success and much future potential. This acquisition creates a raft of new opportunities for SigmaRoc to capitalise on in the months and years ahead. I welcome Rettig Group as a shareholder to SigmaRoc. Their commitment is a strong sign of confidence in the future of our Group," David Barrett, SigmaRoc Chairman.