By Anna Prior 
 

International companies trading in New York ended sharply higher Friday on more positive hints from European leaders and the European Central Bank, as well as data showing the U.S. economy slowed less than expected in the second quarter.

The Bank of New York index of ADRs rose 2.7% to 120.22, boosted by hopes European officials will take action to bring down Spanish and Italian borrowing costs after German Chancellor Angela Merkel and French President Francois Hollande vowed to protect the euro zone. Meanwhile, the U.S. Commerce Department's initial reading of the country's gross domestic product showed annualized growth in the second quarter of 1.5%, better than the 1.3% expected by economists.

The European index increased 2.5% to 111.92, helped higher by surging shares of the National Bank of Greece S.A. (NBG, ETE.AT), which jumped 14% to $1.59. European Union regulators granted temporary approval for a bridge recapitalization of four Greek banks, including the Athens-based National Bank of Greece, worth a total of EUR18 billion, roughly $22.3 billion. EU Antitrust Chief Joaquin Almunia said the aid was granted at a time when Greek banks, hit by the country's debt crisis, are working "under extreme conditions."

Bucking the upswing, however, was Ireland's Amarin Corp. (AMRN), a biopharmaceutical company that received approval from the U.S. Food and Drug Administration for its fish-oil heart pill, Vascepa. However, uncertainty about whether or not the drug will get patent protection, as well as disappointment over the scope of the approval--which was limited to just patients with "very high triglycerides"--weighed on the company's stock price. Shares fell 12% to $13.51.

The Asian index climbed 2.8% to 117.38, boosted by Taiwan-based chipmaker Silicon Motion Technology Corp. (SIMO), which saw shares surge on positive second-quarter results that beat expectations. The company said sales of its "new growth products," specifically LTE and SSD, increased 75% sequentially and accounted for 32% of total revenue, more than offsetting "the unfavorable market conditions relating to sales of our Core Products," said President and Chief Executive Wallace Kou. Shares ended the New York trading day up 22% to $15.33.

The Latin American index jumped 3.4% to 323.73 and the emerging-markets index rose 3% to 272.67.

Harmony Gold Mining Co. (HMY, HAR.JO) said production in the June quarter is likely to be 13% to 14% higher than the previous period, driven by higher tonnage and improved grade. U.S.-listed shares jumped 3.9% to $10.13. Other South African mining companies also traded higher, with Gold Fields Ltd. (GFI, GFI.JO) adding 2.4% to $13.12 and AngloGold Ashanti Ltd. (AU, ANG.JO) rising 3.2% to $34.76.

Write to Anna Prior at anna.prior@dowjones.com.

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