This study focused on the steadily increasing proportion of corporate transactions in the total apartment transaction volume. It also investigated the correlation between this proportion and apartment prices. The analysis confirmed a positive relationship between the corporation's share in apartment transaction volume and the apartment sales index. In particular, the direction of this relationship varied depending on the corporation's market participation status. When a corporation participated as a seller (buyer), it positively (negatively) correlated with the apartment sales index. This study has implications for achieving the policy goal of curbing speculative demand from corporations. However, the system must be restructured to incentivize corporations to actively engage in real estate transactions as sellers to ensure price stability in the real estate market.