The final thesis written for the Purchasing and Sales Operations Course considers the management of the supply chain on the example of HOPS Ltd. In the theoretical overview, the methods used in the research, the subject and the goals of the research are given. The supply chain is defined, its goals, task, elements, features key to the successful functioning of the supply chain and supplier relationship management. It is necessary to continuously cultivate a good relationship with suppliers, based on honesty and trust. Then the risks in the supply chain and some of the techniques of their mitigation and reduction are considered. Anything that can interrupt some of the flows in the supply chain (for example, financial flow, information flow, flow of materials and goods, and others), is a source of potential risk. Procurement contracts are very important because they need to clearly define the rights and obligations of the parties to the contract. In the Ordinance on the implementation of simple procurement procedures of the company HOPS Ltd. therefore, there are articles relating to the conclusion of contracts, payment deadlines and the settlement of disputes under contracts. A theoretical overview of public procurement (current laws and guidelines of European regulations) is presented in Chapter Six. HOPS Ltd. is interesting because it is the obligor of public procurement, i.e. the sectoral contracting authority, as defined by the Public Procurement Act (LPP 2016), therefore the legal provisions and prescribed procedures apply to such companies. HOPS is a vertically integrated entity. By analyzing the research of the public procurement procedure of the company HOPS Ltd. it was found to be in compliance with current regulations. Finally, examples of cost estimates given to practitioners are given. Examples of standardized cost estimates for contracting authorities and tenderers were found on the Electronic Public Procurement Notice page, but an example of an already completed cost estimate was also given. To conclude, green supply chain management can be under the significant influence of public procurement.