Shares of fast-fashion's Shein plunge 14% to record low after profit slides ↧ ↧ Shares of fast-fashion's Shein plunge 14% to record low after profi... Shares of fast-fashion retailer Shein tumbled as much as 14% on Tuesday after it reported a 67% fall ​in quarterly profit in its first post-IPO results, fuelling investor concerns over margin pressure ‌and slowing growth.