Management's report on internal control over financial reporting

The Board of Directors and management of UBS AG (UBS) are responsible for establishing and maintaining adequate internal control over financial reporting. UBS's internal control over financial reporting is designed to provide reasonable assurance regarding the preparation and fair presentation of published financial statements in accordance with International Financial Reporting Standards (IFRS) including a reconciliation of net profit and equity attributable to UBS shareholders to US Generally Accepted Accounting Principles (US GAAP).

UBS's internal control over financial reporting includes those policies and procedures that:

– Pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect transactions and dispositions of assets;

– Provide reasonable assurance that transactions are recorded as necessary to permit preparation and fair presentation of financial statements, and that receipts and expenditures of the company are being made only in accordance with authorizations of UBS management; and

– Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

UBS management assessed the effectiveness of UBS's internal control over financial reporting as of December 31, 2006 based on the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework. Based on this assessment, management believes that, as of Decem- ber 31, 2006, UBS's internal control over financial reporting was effective.

The audited consolidated financial statements of UBS include the results of Banco UBS Pactual S.A.but management's assessment does not include an assessment of the internal control over financial reporting of this entity because it was acquired on December 1, 2006. This approach is consistent with published SEC guidance on the permissible scope of management's internal control report. The financial statements for this entity reflect total assets and operating income constituting less than 1% of the related consolidated financial statement amounts as of and for the year ended December 31, 2006.

Management's assessment of the effectiveness of UBS's internal control over financial reporting as of December 31, 2006 has been audited by Ernst & Young Ltd, UBS's independent registered public accounting firm, as stated in their report appearing on page 78, which expressed unqualified opinions on management's assessment and on the effectiveness of UBS's internal control over financial reporting as of December 31, 2006.