March 11 2008 Disclosure of Equity Participation Pursuant to the Swiss Stock Exchange Act

Syracuse, New York / Zurich, Switzerland — March 11, 2008 — INFICON Holding AG (SWX Swiss Exchange: IFCN), a leading, worldwide manufacturer of instrumentation and process control software for advanced industrial vacuum processes, today announced, that Corisol Holding AG, Blegistrasse 15, 6340 Baar (contact person Beat Frey, +41 41 760 3070) disclosed on March 6, 2008, that it held 78,918 registered shares of INFICON Holding AG at CHF 5 par value each after a purchase on March 5, 2008. This represents 3.35% of the voting rights in INFICON Holding AG. Beat Frey, 8142 Uitikon-Waldegg, is the economic beneficiary of Corisol Holding AG.