Shares of Flat Glass Group experienced a significant surge during intraday trading, soaring 12.66% as investors responded positively to the company's third-quarter financial results. The Chinese solar-glass provider's stock price climbed to HK$12.12, marking its most substantial single-day gain this year.

The company's third-quarter performance showed resilience in a challenging market environment. Despite a decline in average solar-glass market prices compared to the previous year, Flat Glass managed to widen its gross profit margin. This improvement caught the attention of analysts and investors alike. Revenue for the quarter rose by 21% year-over-year to 4.73 billion yuan (US$665.2 million), primarily attributed to higher sales volumes.

However, it's worth noting that Flat Glass reported a sharp decline in third-quarter net profit, which stood at 376.5 million yuan. While Citi analysts acknowledged that the company's revenue and gross profit margin exceeded their expectations, they maintained a cautious stance, expressing uncertainty about the sustainability of this upward earnings trend. As a result, Citi has kept its sell rating on the stock, suggesting that investors should carefully consider the long-term prospects of the company despite the day's impressive stock performance.