Building materials supplier SIG (LON:SHI) saw 20% wiped off its market value as it warned business across Europe had become more challenging.
Like-for-like sales fell by 0.9% in the three months to September, with the UK & Ireland up 0.4% but mainland Europe was 2.3% lower.
A recovery in France stalled in September with October also proving difficult. The home improvement market here in the UK has also started to slow
Gross margins have been hit with the year end outcome now expected to be flat, while a cost saving plan has been accelerated to generate an additional £20mln.
Underlying profit before tax will be within the range of £85mln to £90mln compared to £98.1mln in 2014.
Sales in the nine months to September 2015 were up 0.2%, with the UK & Ireland ahead by 2% and Mainland Europe down 1.7%.
Shares dropped 38p to 140p.