Shares of Opera Software ASA (OPERA, Financial), a Norwegian developer of web browsers, network efficiency applications and mobile monetization solutions, performed well in the fourth quarter, climbing 29.3% on news of strong third quarter results. Investor interest has also been stimulated by the incremental growth opportunity arising from Opera's acquisition of Skyfire, a private technology company providing mobile operators with network capacity management software. (Ashim Mehra)
From Baron Funds fourth quarter 2013 shareholder letter.