The turnover in May of four leading Chinese real estate developers exceeded 10 billion yuan ($1.57 billion), according to their latest financial reports, suggesting a warming market after a year long chill.

The four companies are Poly Real Estate, China Vanke, Evergrande and China Overseas Holdings Ltd.

Top seller Poly's sales in May grew 45 percent over a year earlier to hit 10.77 billion yuan, slightly higher than that of China Vanke. It was the first month in 2012 that Poly had revenues of more than 10 billion yuan.

The combined turnover in May for the top 15 of China's property developers reached 268.6 billion yuan. Half of that turnover grew more than 20 percent last month.