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  Disclosure announcement transmitted by euro adhoc. The issuer is responsible
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16.05.2007

After five years in the auction market  SW  Umwelttechnik  returns  to  the  top
segment of the Vienna Stock Exchange.

On the 21st of May the graduation from the standard market auction  to  the  top
segment of the Vienna Stock Exchange - the prime  market  -  takes  place.  This
shall increase the attractiveness of the share both  for  existing  shareholders
and for new international investors. These changes are  supported  by  the  good
growth prospects due to the positioning in Central and Eastern Europe.

In the prime market a trading participant will act as a  specialist.  The  share
price will then be determined  by  the  continuous  trading  procedure.  Regular
reporting has already been adjusted to the more comprehensive  report  structure
required fort he prime market segment, to provide a degree  of  transparency  as
high as possible for institutional and private investors.

Further inquiry note:
Dr. Bernd Wolschner, member of the Management Board 
Tel: +43 (0)664 3413953; fax: +43 (0)7259  31356

Michaela Wolschner, Investor Relations 
Tel: +43 (0)664 8117662; fax: +43 (0)1  8772617
Web: www.sw-umwelttechnik.com

emitter:      SW Umwelttechnik Stoiser & Wolschner AG
              Bahnstraße 87-93
              A-9020 Klagenfurt
phone:        0043-463-321090
FAX:          0043-463-37667
mail:         office@sw-umwelttechnik.com
WWW:          http://www.sw-umwelttechnik.com
sector:       Technology
ISIN:         AT0000808209
indexes:      WBI
stockmarkets: free trade: Börse Berlin-Bremen, Frankfurter Wertpapierbörse,
              Regulated free trade: Wiener Börse AG 
language:     English