Indeed, since April 2025, Ceres Power Holdings (LSE:CWR) has seen its market-cap grow from below £100m to over £650m (at 1 August). Sceptics suggest that if it can't move out of the red quickly, it could soon regain its status as a penny stock. Despite being one of the FTSE 250's star performers in recent years, the Ceres Power share price has fallen nearly 50% over the past five weeks. But if truth be told, the stock was starting to lose some of its shine before this. After all, Ceres Power is about more than Doosan.