Improvement in employees’ learning is the primary driver of organizational sustainability. This study investigates the effect of training programs on employees’ knowledge, focusing on knowledge-based outcomes (KBO), skill-based outcomes (SBO), and affective outcomes (AO). Drawing upon Human Capital Theory (HCT) and the second level of Kirkpatrick's training evaluation model, a pre-experimental research design and quantitative method were employed. A stratified random sampling technique was used to select 381 employees from eight Private Commercial Banks (PCBs) of four bank generations in Bangladesh who participated in pre-test and post-test assessments. Statistical techniques were used to analyse the data, including comparison figures, normality tests (Shapiro-Wilk W Test and Skewness and Kurtosis Test), and paired t-tests. Findings indicate significant improvements in KBO, SBO, and AO following training interventions, supported by statistical tests conducted using MS Excel v.13. Later, findings from executing STATA v.12 also underscore the effect of training programs on upgrading employees’ learning in the PCBs. Limitation includes the absence of a control group that hinders the influence of potential external factors influencing learning outcomes, which is a new avenue for future research.