Large enterprises tend to perform better than small and medium-sized enterprises (SMEs) in normal times. However, this general principle may not hold true during periods of instability such as large-scale pandemics. While large companies may be able to implement a work-from-home system more flexibly, SMEs may require government support. Against this backdrop, we empirically investigate the effect of the COVID-19 pandemic on the labor market, especially wages, in Thailand. By using the individual-level quarterly data in Thailand from 2019 to 2022, we examine the differences in the wage impact of the COVID-19 pandemic according to company size. Our finding is that, as in other countries, workers in larger-sized companies had significantly higher wages. However, we also find that the COVID-19 pandemic contributed to reducing the wage gap across company sizes on average, especially in the manufacturing sector.