Financial resources management issues are relevant for each commercial bank. Those banks that operate with an excess of free financial resources lose profitability, but the liquidity of such banks is quite high. Other banks that conduct aggressive policy aiming to place all the available resources with maximum efficiency, are forced to seek solutions to the problem of locating additional liquid funds, in order to ensure timely fulfilment of liabilities. In this article, the authors analyze the state of the resource base of Latvian commercial banks, identify reserves for increasing the efficiency of banks and propose a methodology for optimizing the attraction and placement of resources in commercial banks. Since bank resources management involves two interrelated issues – equity capital management and management of liabilities (attracted and borrowed funds), the authors successively consider two sides of this process. Besides, the process of equity capital and liabilities management is inseparably linked with active transactions, i.e. with the use of resources, therefore the research also focuses on the interrelation between passive and active transactions of the bank and on the development of a methodology for optimizing the attraction and allocation of bank resources. The purpose of the research is to analyse passive operations in Latvian banks, to assess the formation of their resource base and its management, as well as to work out some recommendations on how to update the management of the combined (aggregate) resource base in Latvian commercial banks. The authors have put forward a following hypothesis: the decline in financial resources leads to an increase in the bank's efficiency, and vice versa, the increase in financial resources leads to an inefficient redistribution of funds in the banking activity. During the study, this hypothesis was justified. The theoretical and methodological basis for the research includes scientific works by Latvian and foreign authors, special economic literature, Latvian legislation, regulations of the Bank of Latvia and of the Financial and Capital Market Commission, recommendations of the Basel Committee on Banking Supervision, EU Directives. The authors used such research methods as economic analysis, method of comparison, economic grouping, statistical methods, etc. The application of the proposed methodology for optimizing the attraction and placement of resources is considered on the example of Latvian commercial banks.