Volvo Group, (VOLVY: chart), truck maker, reported that Q4 net income dropped 15% to 7.37 kronor a share, while sales grew 15%. The company announced that operating margin in Q4 fell to 6.5% from 8.2% last year on account of extensive product launches. Volvo stated its income was affected by a 430 million kronor capital gain from the sale of Celero and a 550 million kronor write down of its holdings in Blue Bird.