On May 15, 2009 , cominvest Asset Management GmbH, Frankfurt am Main, Deutschland has informed us according

AIXTRON AG / Release of an announcement according to Article 21, Section 1 of the WpHG [the German Securities Trading Act] (share)

Release of a Voting Rights announcement, transmitted by DGAP - a company of
EquityStory AG.
The issuer is solely responsible for the content of this announcement.
----------------------------------------------------------------------

On May 15, 2009 , cominvest Asset Management GmbH, Frankfurt am Main,
Deutschland has informed us according to Article 21, Section 1 of the WpHG
that via shares its Voting Rights on AIXTRON AG, Aachen, Deutschland, ISIN:
DE000A0WMPJ6, WKN: A0WMPJ, have fallen below the 5% limit of the Voting
Rights on May 14, 2009  and now amount to 4.98% (this corresponds to
4527615 Voting Rights).
According to Article 22, Section 1, Sentence 1, No. 6 of the WpHG, 2.33% of
the Voting Rights (this corresponds to 2116615 Voting Rights) is to be
attributed to the company.

15.05.2009  Financial News transmitted by DGAP
----------------------------------------------------------------------
 
Language:     English
Issuer:       AIXTRON AG
              Kackertstr. 15-17
              52072 Aachen
              Deutschland
Internet:     www.aixtron.com
 
End of News                                     DGAP News-Service
 
---------------------------------------------------------------------------

Our registered trademarks: AIXACT®, AIXTRON®, Atomic Level Solutions®, Close Coupled Showerhead®, CRIUS®, EXP®, EPISON®, Gas Foil Rotation®, Optacap™, OVPD®, Planetary Reactor®, PVPD®, STExS®, Trijet®