Goal. The article defines the key areas of ethical behavior of supplier companies in the course of their activities on the market and in their relationships with their customers, employees, third parties, and the environment. Method. To realize the set goal, the article uses various general scientific and special methods of scientific research, in particular, the method of scientific abstraction, induction, deduction, synthesis, analysis, comparison, etc. The results. The key features that ethical suppliers should meet in order to form a positive image and reputation of them are outlined. In addition, key requirements for the ethical activity of suppliers in the context of such key positions as commercial good faith, fair competition, conflict of interest, control of international trade, confidentiality and intellectual property, confidentiality and data protection, identification of problems, fair marketing practices are defined. In addition, supplier organizations must ensure the protection of human rights in relation to their employees, direct funds to protect their health, and must also interact responsibly and conscientiously with the environment, ensuring the following aspects: inadmissibility of child labor, free choice of workplace, freedom of participation in associations , compliance with the schedule of work and rest, payment of wages, compliance with benefits, inclusiveness and diversity, absence of threats and harassment, occupational safety, process safety, product safety, environmental protection, water resources and waste management. Scientific novelty. A theoretical substantiation of the need to comply with ethical requirements by supplier companies in their professional activities and in relations with partners, clients and stakeholders for their more effective functioning on the market has been made. Practical significance. The obtained results of the conducted analysis are suitable for use in the process of developing codes of ethics of supplier companies in the domestic market, compliance with which will have a positive effect on the relationship between suppliers and their customers, will contribute to the formation of a positive business image of both the supplier company itself and those companies that interact with it.