Notes (unaudited)

Accounting standards require separate disclosure of net interest income and net trading income (see the tables on this and the next page). This required disclosure, however, does not take into account that net interest and trading income are generated by a range of different businesses. In many cases, a particular business can generate both net interest and trading income. Fixed income trading activity, for example, generates both trading profits and coupon income. UBS management therefore analyzes net interest and trading income according to the businesses that drive it. The second table below (labeled Breakdown by businesses) provides information that corresponds to this management view. Net income from trading businesses includes both interest and trading income generated by the Group's trading businesses and the Investment Bank's lending activities. Net income from interest margin businesses comprises interest income from the Group's loan portfolio. Net income from treasury and other activities reflects all income from the Group's centralized treasury function.

Financial liabilities designated at fair value are to a large extent economically hedged with derivatives and other instruments whose change in fair value is also reported in Net trading income.

The Group recorded a gain of CHF 2,103 million and CHF 659 million for the quarters ended 31 March 2008 and 31 December 2007, respectively in Net trading income from changes in the fair value of financial liabilities designated at fair value attributable to changes in the Group's own credit risk. The change applies to those financial liabilities designated at fair value where the Group's own credit risk would be considered by market participants and excludes fully collateralized transactions and other instruments for which it is established market practice not to include an entity-specific adjustment for own credit. It was calculated based on a senior long-term debt curve generated from observed external pricing for funding associated with new senior debt issued by the Group.