X0203 0001143313 AMERICAN STOCK EXCHANGE LLC 0001114446 UBS AG 001-15060

BAHNHOFSTRASSE 45 P O BOX CH 8098 Zurich V8 SWITZERLAND V8

41-1-234-4100 TIERS S&P 500 Index-Linked Notes, offering protection up to 25% decline in S&P 500 Index, maturing November 5, 2007 17 CFR 240.12d2-2(a)(2) Kerri L. Ramirez Manager, Corporate Actions and Proxy Rulings 2007-11-14