Exhibit 99.1
[LOGO]
ASX
AUSTRALIAN STOCK EXCHANGE
MARKET RELEASE
3 August 2005
PSIVIDA LIMITED
TRADING HALT
The securities of pSivida Limited (the “Company”) will be placed in pre-open at the request of the Company, pending the release of an announcement by the Company. Unless ASX decides otherwise, the securities will remain in pre-open until the earlier of the commencement of normal trading on Monday, 8 August 2005 or when the announcement is released to the market.
Security Code: PSD
/s/ Brendan O’Hara
Brendan O’Hara
Manager Companies
[pSivida letterhead]
3 August 2005
BY FACSIMILE: 9221 2020
Ms Christine Panetta
Senior Companies Advisor
Australian Stock Exchange Limited
Exchange Plaza
2 The Esplanade
PERTH WA 6000
Dear Ms Panetta
Trading Halt Requested
Under listing rule 17.1 the company requests a voluntary trading halt, pending the release of an announcement.
We understand that the trading halt will be in place until the market opens on Monday 8th August 2005.
Yours faithfully
pSivida Limited
/s/ Gavin Rezos
Gavin Rezos
Managing Director