The aim of this paper is to examine the possible association between the effectiveness of Board of Directors (BOD) and firm performance (FP). For the purpose of this analysis, data is derived from firms listed in the materials sector of the Saudi Exchange Market’s Tadawul All Share Index (TASI). Using pooled OLS regression analysis and the dependent variables of ROA and ROE as a proxy for FP, while board meetings (BMEET), independence and board size (BSIZE) are used as explanatory variables, the results reveal that frequent BMEET may not lead to improved FP. Moreover, the results show that BMEET frequency is negatively associated with FP. Independent members do not provide additional efficiency leading to better FP. As for the BSIZE, the findings indicate that larger boards are associated with lower FP. Such findings offer insights into the effect of BSIZE on FP. The results are of interest to decision makers, policymakers and investors.