CREATE TABLE Ref_Company_Types (company_type_code VARCHAR2)
CREATE TABLE Maintenance_Contracts (maintenance_contract_company_id VARCHAR2, contract_end_date VARCHAR2)
CREATE TABLE Third_Party_Companies (company_name VARCHAR2, company_id VARCHAR2, company_type_code VARCHAR2)

What is the description of the type of the company who concluded its contracts most recently?
SELECT T1.company_name FROM Third_Party_Companies AS T1 JOIN Maintenance_Contracts AS T2 ON T1.company_id = T2.maintenance_contract_company_id JOIN Ref_Company_Types AS T3 ON T1.company_type_code = T3.company_type_code ORDER BY T2.contract_end_date DESC LIMIT 1
SELECT "T1"."company_name" FROM "Third_Party_Companies" "T1" JOIN "Maintenance_Contracts" "T2" ON "T1"."company_id" = "T2"."maintenance_contract_company_id" JOIN "Ref_Company_Types" "T3" ON "T1"."company_type_code" = "T3"."company_type_code" ORDER BY "T2"."contract_end_date" DESC FETCH FIRST 1 ROWS ONLY