Marshall & Ilsley Corp. (MI) revised its fourth-quarter result to include a $1.5 billion write-down reflecting the decline in the bank's stock price because of the economic deterioration and financial market weakness.

The revision puts the quarter's net loss at $7.25 a share, not the $1.55 posted in January.

Marshall & Ilsley's shares were down 4.8% at $4.36 in premarket trading. The stock has lost nearly two-thirds of its value so far this year.

Marshall & Ilsley's problems stem not only from its struggles with its heavy exposure to some of the most troubled housing markets, but also from its especially large exposures to commercial construction loans. The company reported in January it more than tripled its provision for loan and lease losses during the fourth quarter as charge-offs and non-performing loans surged.

-By Kerry E. Grace, Dow Jones Newswires; 201-938-5089; kerry.grace@dowjones.com