Zurich Insurance Group AG fell in Zurich trading after posting a quarterly profit supported by one-time gains as Chief Executive Officer Mario Greco presses ahead with an overhaul of Switzerland’s largest insurer. Net income for the three months through December amounted to $685 million compared with a loss of $424 million a year earlier due to restructuring costs and claims from storms in Britain and Ireland, the Zurich-based company said Thursday in a statement.