Weak sentiment weighed on Refex Industries during the December 12 session as the stock opened with a sharp gap down of 7.55% and extended losses intraday. Shares fell to a low of Rs 281.55, marking an 11.43% drop from the previous close, before trading nearly 10.85% lower on the day. The stock has declined for three straight sessions and is down over 21% in the past month, underperforming both the Sensex and its chemical sector peers.