February 15 2006 Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Syracuse, New York/Zurich, Switzerland — February 15, 2006 — INFICON Holding AG (SWX Swiss Exchange: IFCN), a leading manufacturer of vacuum instrumentation and process control software for the semiconductor and related industries and other industrial applications, today announced that according to a notification received today February 15, 2006, from Unaxis Holding AG, Churerstrasse 120, 8808 Pfäffikon SZ, Unaxis held as a result of a transaction entered into on February 9, 2006 a total of 6,150,500 call options on INFICON. The transaction was concluded on February 14, 2006. Given a ratio of 30 options for 1 share, the remaining number of options equals 205,016 INFICON registered shares at CHF 10 par value each or 8.74 % of the voting rights in INFICON Holding AG.

Corporate Contact
Betty Ann Kram
Director of Corporate Communications
and Investor Relations
+1.315.434.1122
BettyAnn.Kram@inficon.com

European Contact
Bernhard Schweizer
sensus PR GmbH
+41.43.366.5511
bschweizer@sensus.ch