The price of shares in ArcelorMittal, the biggest steelmaker in the world, was showing a fall of 3.51 per cent to 9.82 euros.
The overall Paris market as measured by the CAC 40 index was down 1.47 percent.
Morgan Stanley analysts issued a note to investors advising that they adjust their portfolios to be under-represented, or under weight, in ArcelorMittal shares, rather than being neutral as they had recommended previously.
They said that the market had priced into the shares a recovery which was unlikely to occur, noting that they were being traded at a price 20 per cent higher than the lowest price reached in July.
On August 1, ArcelorMittal reported a first-half loss of USD 1.12 billion and downgraded its target for underlying profit for the whole year, but said it expected an improvement in the second half of the year.
Steelmakers are big users of raw materials, notably iron ore, and in London today the price of shares across the mining sector was sharply down as Switzerland-based giant Glencore Xstrata reported a big first-half loss.