The main objective of corporate organizations is to maximize shareholders' wealth. As such, making the right capital structure decisions is essential for financial stability and long-term growth. This study examines how equity financing influences the financial performance of listed manufacturing companies in Nigeria, using Return on Capital Employed (ROCE) and Market Value (MV) as performance indicators. The study is limited to selected manufacturing firms listed on the Nigerian Stock Exchange and covers a 15-year period from 2007 to 2021. This timeframe was chosen due to the financial crises that impacted the Nigerian economy during this period, compelling many firms to reassess their financing strategies. The analysis employs dynamic panel regression, cross-sectional dependence tests, and panel cointegration methods. Key variables include Share Premium, Revenue Reserves, Firm Size, and Firm Age. The findings reveal that ROCE is significantly influenced by its previous values (lagged ROCE coefficient = 0.927, p < 0.001), while Share Premium and Revenue Reserves show no significant impact. Interestingly, Firm Age has a negative effect on ROCE (-0.078, p < 0.01), indicating that older firms may become less efficient in using capital. On the other hand, both lagged MV (0.847, p < 0.001) and Share Premium (0.365, p < 0.001) positively influence market value. Additionally, Firm Age shows a small but significant positive effect on MV (0.024, p < 0.001), suggesting that older firms, despite declining efficiency, can still increase their market valuation. The study concludes that equity financing especially through increased Share Premium can enhance market value. It recommends that manufacturing firms focus on boosting share premium while also finding ways to manage capital efficiency challenges associated with firm aging.