Exhibit 15
 
Zurich, 28 March 2024
Consent of Independent Registered
 
Public Accounting Firm
We consent to the incorporation by reference in each
 
of the following registration statements of
 
UBS AG:
(1)
 
on Form F-3 (Registration Number 333-263376),
 
and each related prospectus currently outstanding
under such registration statement,
(2)
 
the base prospectus of Corporate Asset Backed
 
Corporation (CABCO) dated 23 June 2004
(Registration Number 333-111572),
(3)
 
the Form 8-K of CABCO dated 23 June
 
2004 (SEC File Number 001-13444), and
(4)
 
the Prospectus Supplements relating to
 
the CABCO Series 2004-101 Trust dated 10 May 2004
(Registration Number 033-91744) and 17 May
 
2004 (Registration Number 033-91744-05),
 
of our reports dated 27 March 2024, with respect
 
to the consolidated financial statements
 
of UBS AG and the
effectiveness of internal control over financial reporting
 
of UBS AG, included in this Annual
 
Report (Form 20-
F) for the year ended 31 December 2023,
 
filed with the Securities and Exchange
 
Commission.
/s/ Ernst & Young Ltd