Bloomberg BlackBerry Ltd. filed a patent-infringement lawsuit against Nokia Oyj, demanding royalties on the Finnish company’s mobile network products that use an industrywide technology standard. Nokia’s products including its Flexi Multiradio base stations, radio network controllers and Liquid Radio software are using technology covered by as many as 11 patents, BlackBerry said in a complaint filed in federal court …

  Bloomberg Simmering tensions between Anthem Inc. and Cigna Corp. exploded as Cigna sued to end their $48 billion deal, and Anthem moments later said it would fight to keep the merger alive. The clash came just hours after the other US health insurance megadeal, a $37 billion tie-up between Aetna Inc. and Humana Inc., ended peacefully with the companies …

  Bloomberg American International Group Inc. posted its fourth loss in six quarters, burned again by higher-than-expected claims costs as Chief Executive Officer Peter Hancock struggles to sustain profitability. The net loss widened to $3.04 billion, or $2.96 a share, from a $1.84 billion, or $1.50, a year earlier, the New York-based insurer said in a statement. The fourth quarter’s …