Disclosure of Shareholdings

Bad Ragaz / Switzerland — October 29, 2010 — INFICON Holding AG (SIX Swiss Exchange: IFCN), a leading, worldwide manufacturer of instrumentation and process control software for advanced industrial vacuum processes, today announced that BlackRock Inc., 40 East 52nd Street, New York, NY10022, USA (Contact Zaf Fahmy, Black Rock Investment Management (UK) Limited, 33 Kind William Street, London, EC4R 9AS, Tel: +44 20 7743 3503), as mother company holds according to a notification signed on October 28, 2010, indirectly and directly since a sale on October 22, 2010 with 105795 registered shares (= 4.91% of voting rights) and 403 CFDs (= 0.02 of voting rights) now totally 4.93% or less than 5% of the voting rights in INFICON Holding.

Indirect Holdings Via:
BlackRock Inc.; BlackRock Holdco 2 Inc.; BlackRock Holdco 4 LLC; BlackRock Holdco 6 LLC; Blackrock Delaware Holdings Inc.; BlackRock Financial Management Inc.; BlackRock Advisors Holdings Inc.; BlackRock International Holdings Inc.; Trident Merger LLC; 40 East 52nd Street, New York, NY 10022,
BlackRock Group Limited; BlackRock Investment Management (UK) Limited; 33 King William Street, London EC4R 9AS, UK,
BR Jersey International Holdings LP; 22, Grenville Street, St. Helier, JE4 8PX, Jersey,
BlackRock International Limited; 40 Torphichen Street, Edinburgh EH3 8JB,
BlackRock (Institutional) Canada Ltd.; BlackRock Holdings Canada Ltd.; 161 Bay Street, Suite 2500, Toronto, Ontario M5J 2S1, Canada,
BlackRock Institutional Trust Company N.A; 400 Howard Street, San Francisco, CA 94105-26108,
BlackRock Australia Holdco Pty.; Level 43, Grosvenor Place, 225 George Street, Sydney, NSW 2000, Australien,
BlackRock Luxembourg Holdco S.a.r.l.; 6D, Route de Trèves, Senningerberg, L-2633 Luxembourg,
BlackRock Cayco Ltd; c/o Walkers SPV Limited, P.O. Box 908GT, Walker House, Mary Street, George Town, British West Indies, Cayman Islands,
Black Rock Trident Holding Co. Ltd.; Riverside Two, Sir John Rogerson’s Quay, Grand Canal Dock, Dublin 2, Irland,

Direct Holdings Via:
BlackRock Asset Management Japan Limited; Sapia Tower, 1-8-3 Marunouchi, Chiyoda-ku, Tokyo, 100-8217 Japan,
Blackrock Advisors UK Ltd.; Murray House, 1 Royal Mint Court, London, EC3N 4HH, UK,
BlackRock Institutional Trust Company N.A.; BlackRock Fund Advisors; 400 Howard St. San Francisco, CA 94105-2618, USA,
BlackRock (Luxembourg) S.A.; 6D, Route de Trèves, Senningerberg, L-2633 Luxembourg,
BlackRock International Limited; 40 Torphichen Street, Edinbourgh, Scotland, EH3 8JB, UK
BlackRock Investment Management (UK) Ltd.; 33 Kind William Street London, England, EC4R 9AS, UK
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