The current study aims to detect any significant relationship between corporate social responsibility (CSR) score and type of industrial sector to which sampled companies belong, and to assess how this relationship tends to change with the size of the firm. Application of One-way ANOVA for the sixyear time period, i.e. from 2014-15 and 2019-20, has reported that CSR disclosure of all industrial sectors does vary and such differences in CSR scores are highly apparent in small firms with one sector reported significantly higher disclosure than the other. In fact, such sectoral CSR dissimilarities have been gauged size-wise as well in the contextual spheres of environmental, community development, and employee relations categories, for example, CSR disclosure of power and electricity generation is significantly greater than that of minerals, metals & mining in case of environment and sustainability dimension. Overall, small companies need to put greater focus on carrying out and reporting of CSR activities keeping in mind the expectations of all stakeholders.