Purpose – This paper aims to investigate the relationship between the impact of COVID-19 on the performance of financial managers of medium and large companies. Design/methodology/approach – This research used the data of 173 listed large and over-the-counter as medium-size companies from 2018 to 2021. The results of these tests have been analyzed using panel data and STATA 15 software. Findings – The results showed that COVID-19 has no significant relationship with the return on equity in large and medium-size companies. This variable does not significantly affect Tobin’s Q index in medium-size companies either. Other financial indicators examined in this research have decreased considerably in under the influence of COVID-19. Still, the intensity of this effect is different in large and medium-size companies. Funds from borrowings and Tobin’s Q ratios in medium-size companies compared with large companies have been more severely affected by the COVID-19 disease; the return on assets, book value to market value and large companies compared with medium-size companies have been more severely and significantly affected by COVID-19; and financing funds through the issuance of shares in large companies and medium-size companies have been affected by COVID-19 almost equally

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