Grupa Azoty S.A. (WSE:ATT) signed confidentiality document for negotiations with Polski Koncern Naftowy ORLEN Spólka Akcyjna (WSE:PKN) (PKN Orlen) and Grupa Azoty Zaklady Azotowe "Pulawy" S.A. Document signed in connection with PKN Orlen intention to commence talks on potential acquisition of GA Pulawy.