** Shares of China National Building Material 3323.HK drop 12.3% to HK$4.93, on track for the biggest one-day pct decline since April 7, 2025

** Stock sinks to the lowest since January 20 on the second session of fall

** China-based building materials producer expects its net loss for 2025 to amount to 2.3 bln yuan-4 bln yuan ($330.9 mln-$575.5 mln), as compared to 2.39 bln yuan profit in 2024, amid decrease in sales of cement

** Says an increase in impairment loss on its property, plant and equipment and goodwill also hits its results

** YTD, stock down 1%, while benchmark Hang Seng Index .HIS up 3.9%

($1 = 6.9506 Chinese yuan renminbi)

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))