UBS CFO Todd Tuckner reported a credit loss expense of approximately 150 million Swiss francs in the fourth quarter, attributing it to sluggish economic growth in Europe, particularly affecting Swiss companies with export-import operations. He noted that while Switzerland's macro environment is stable, neighboring eurozone economies, especially Germany, are struggling, which has intensified the impact on credit losses. Tuckner also mentioned that the situation has been worsened by the dynamics following UBS's acquisition of Credit Suisse.