Over the recent years, companies all over the world have been challenged with restrictions caused by the Covid-19 pandemic. The article presents a brief comparative analysis of how the pandemic affected the financial and economic activities of both vertically integrated oil companies and independent oil and gas companies. The comparative analysis is focused on assessing financial stability of Irkutsk Oil Company Ltd. (INK Ltd.). Despite being affected by the pandemic, which led to low liquidity indicators, the solvency of INK Ltd. remains at a high level. The comparative analysis indicated that enterprises, depending on size and chosen development strategies, react differently to challenges and achieve different results. Vertically integrated companies often lack flexibility due to complex management structures and large-scale production. On the other hand, companies with fewer resources but with greater flexibility often gain leading positions.