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Actelion Pharmaceuticals Ltd (OTC:ALIOF) Corporate news announcement processed and transmitted by Hugin ASA. The issuer is solely responsible for the content of this announcement. ---------------------------------------------------------------------- -------------- Actelion senior management to host Q & A session



Dear Member of the Investment Community

Actelion Ltd will announce the Half Year Financial results 2008 on Tuesday, 22 July 2008, at 07.00 hrs CEST / 06.00 hrs BST / 01.00 a.m. EDT. An investor conference call & webcast will be held at 15.30 hrs, CEST to discuss the results.

To discuss the results, Actelion will host an Investor Conference Call / Webcast as follows:

Date/Time:

22 July 2008 15.30 hrs - 16.15 hrs Basel (CEST) 14.30 hrs - 15.15 hrs U.K. (BST) 09.30 a.m. - 10.15 a.m. U.S. (EDT)

Conference Call Connect #: Dial-in participants should start calling the number below 10-15 minutes before the Conference is due to start.

Dial: Europe: +41 44 580 64 03 U.K.: +44 207 10 86 206 U.S.: +1 866 92 86 044

Participant's mode: Listen-Only with possibility to open individual lines during Q&A session. Participants will be asked for their Name and Company.

Webcast Access: Webcast participants should visit the Actelion website for further details http://www.actelion.com/ 10-15 minutes before the conference is due to start. If you experience any access problems go directly to the URL: http://gaia.world-television.com/actelion/20080722/trunc

Participant's mode: Listen-Only with possibility to ask individual questions by clicking on the Q&A button. Participants will be asked to provide their Name and Company.

Webcast Replay: The archived Investor Webcast will be available for replay through http://www.actelion.com/ approximately 60 minutes after the call has ended.

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Actelion Pharmaceuticals Ltd Gewerbestrasse 16 Allschwil Switzerland

WKN: 936767; ISIN: CH0010532478; Index: SBIOM, SLIFE, SMCI, SMIEXP, SMIM, SPI, SPIEX; Listed: Main Market in SWX Swiss Exchange;



LINK: http://hugin.info/131801/R/1237029/264197.pdf

Actelion Pharmaceuticals Ltd

http://www.actelion.com

ISIN: CH0010532478

Stock Identifier: XSWX.ATLN

US: OTC:ALIOF