ANNUAL GENERAL MEETING OF SHAREHOLDERS OF

ORION ENGINEERED CARBONS S.A.

April 15, 2015

IMPORTANT NOTICE OF INTERNET AVAILABILITY OF PROXY MATERIAL FOR THE ANNUAL GENERAL MEETING:

The Notice of Meeting and proxy card

are available at

http://www.orioncarbons.com

Please sign, date and mail

your proxy card in the

envelope provided

as soon as possible.

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ORION ENGINEERED CARBONS S.A.

Proxy for Annual GeneralMeeting of Shareholders on April 15, 2015

Solicited on Behalf of the Board of Directors

The undersigned hereby appoints Romeo Kreinberg, Claus von Hermann, Hans-Dietrich Winkhaus and Christian Eggert, and each of them, as proxies of the undersigned, each with full power of substitution and power to act alone, to represent and vote as designated on the reverse side, all of the common shares, no par value (the “Common Shares”) of Orion Engineered Carbons S.A. (the “Company”), held of record by the undersigned as of 11:59 P.M. Central European Time on March 9, 2015, at the Annual General Meeting of Shareholders of the Company to be held in Luxembourg, Grand Duchy of Luxembourg, at 10:00 A.M. Central European Time on April 15, 2015 and at any adjournments or postponements thereof. This proxy is governed by Luxembourg law.

(Continued and to be signed on the reverse side.)

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