This research paper analyzes the effects of lending, third-party funds, and company size on the profitability of banking companies listed on the Indonesia Stock Exchange for the period 2016-2020. Findings indicate that all three factors positively influence profitability, providing empirical support for agency theory and offering practical insights for investors. The study utilized multiple linear regression analysis on data from 38 banks, highlighting the significance of loan distribution, third-party funds, and the size of the bank in determining financial success.