Seasoned equity offerings (SEOs) are often perceived as negative signals of financial distress, typically resulting in stock price declines. Larger SEOs generally trigger stronger negative market reactions. However, under certain conditions, SEOs can lead to positive stock price responses. This study examines how SEO size, allocation method, and purpose jointly affect stock returns. In particular, third-party allocations involving institutional investors—such as private equity funds or investment banks—may serve as positive market signals. The purpose of SEOs also plays a critical role in shaping market reactions. When firms issue equity to raise working capital or repay debt, the market may interpret this as a sign of financial weakness. In contrast, SEOs aimed at funding acquisitions, R&D, or capital investments can enhance growth expectations and improve stock performance. We analyze SEOs by non-financial firms in Korea from 2011 to 2023. The results show that larger SEOs tend to reduce stock prices. However, thirdparty placements and investment-driven SEOs are associated with more favorable market reactions than rights offerings or debt-related SEOs. Furthermore, we find a significant positive interaction between SEO size, third-party allocation, and investment purpose. This suggests that large SEOs, when conducted for strategic investments and placed with institutional investors, are viewed positively by the market.