Mastech Corp, Pittsburgh-based technology services company, has reported fourth quarter net profits up 91.4% at $10.5m on revenues up 57.3% at $113.2m; net profits for the year to December 31 were up 128% at $36.6m on revenues that rose 62.5% to $390.8m. Net earnings per share rose 75% to $0.21 in the quarter, up 108.5% to $0.73 in the year.