Notes to the Financial Statements

For the three months ended 31 March 2005

Internal charges and transfer pricing adjustments are reflected in the performance of each business. Revenue-sharing agreements are used to allocate external customer revenues to a Business Group on a reasonable basis. Transactions between Business Groups are conducted at arm’s length. The presentation of the business segments below reflects UBS’s organization structure and management responsibilities. UBS’s financial businesses are organized on a worldwide basis into four Business Groups and the Corporate Center. Wealth Management & Business Banking is segregated into two segments, Wealth Management and Business Banking Switzerland. The Corporate Center also consists of two segments, Private Banks & GAM and Corporate Functions. The Industrial Holdings segment holds all industrial operations controlled by the Group. In total, UBS reports eight business segments.

Management reporting based on expected credit loss
For internal management reporting purposes, we measure credit loss using an expected loss concept. This table shows Business Group performance consistent with the way in which our businesses are managed and the way Business Group performance is measured. Expected credit loss reflects the average annual costs that are expected to arise from positions in the current portfolio that become impaired. The adjusted expected credit loss reported for each Business Group is the expected credit loss on its portfolio plus the difference between credit loss expense and expected credit loss, amortized over a three year period. The difference between these adjusted expected credit loss figures and the credit loss expense recorded at Group level for reporting purposes is reported in Corporate Functions.

For the three months ended 31 March 2004

Internal charges and transfer pricing adjustments are reflected in the performance of each business. Revenue-sharing agreements are used to allocate external customer revenues to a Business Group on a reasonable basis. Transactions between Business Groups are conducted at arm’s length. The presentation of the business segments below reflects UBS’s organization structure and management responsibilities. UBS’s financial businesses are organized on a worldwide basis into four Business Groups and the Corporate Center. Wealth Management & Business Banking is segregated into two segments, Wealth Management and Business Banking Switzerland. The Corporate Center also consists of two segments, Private Banks & GAM and Corporate Functions. The Industrial Holdings segment holds all industrial operations controlled by the Group. In total, UBS reports eight business segments.

Management reporting based on expected credit loss
For internal management reporting purposes, we measure credit loss using an expected loss concept. This table shows Business Group performance consistent with the way in which our businesses are managed and the way Business Group performance is measured. Expected credit loss reflects the average annual costs that are expected to arise from positions in the current portfolio that become impaired. The adjusted expected credit loss reported for each Business Group is the expected credit loss on its portfolio plus the difference between credit loss expense and expected credit loss, amortized over a three year period. The difference between these adjusted expected credit loss figures and the credit loss expense recorded at Group level for reporting purposes is reported in Corporate Functions.