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Each time a contract is about to expire, employers must notify their employees or vendors in writing. If you would like to renew the contract, you may include a copy of the new contract or set up a meeting to discuss the new terms. If you are not going to renew the contract, you should tell the other parties in the letter and briefly explain why you are not renewing with them. (ehow.com)

Definition of supplier: A party that supplies goods or services. A supplier may be distinguished from a contractor or subcontractor, who commonly adds specialized input to deliverables. Also called vendor. (BusinessDictionary)

If you own a business, you will have to enter into many contracts with vendors, customers and other parties. A business contract is a legally binding agreement between two parties, usually for the provision of goods and services or both. (findlaw.co.uk)

A general contractor (main contractor, prime contractor) is responsible for the day-to-day oversight of a construction site, management of vendors and trades, and communication of information to involved parties throughout the course of a building project. (Wikipedia)