Advisory: Nektar Sets Announcement Date and Conference Call for Second Quarter 2005 Results.

SAN CARLOS, Calif. -- Nektar Therapeutics (Nasdaq:NKTR) will announce its financial results for the second quarter ended June 30, 2005, on Thursday, August 4, 2005. On that day, Ajit S. Gill, Nektar president and chief executive officer, will host a conference call for analysts and investors beginning at 2:00 p.m. Pacific Time, to discuss further the company's performance.

Investors can access a live audio-only webcast through a link that will be posted on the Investor Relations section of Nektar's website at http://www.nektar.com. The web broadcast of the conference call will be available for replay through August 18, 2005.

Analysts and investors can also access the conference call live via telephone by dialing [phone] (U.S.); [phone] (International). The passcode is 12290907 and the host is Mr. Ajit Gill. An audio replay will be available shortly following the call through August 18, 2005 and can be accessed by dialing [phone] (U.S.); or [phone] (International) with a passcode of 12290907. In the event that any non-GAAP financial measure is discussed on the conference call that is not described in the press release, related information will be made available on the Investor Relations page at the Nektar website as soon as practical after the conclusion of the conference call.

Nektar Therapeutics enables high-value, differentiated therapeutics with its industry-leading drug delivery technologies, expertise and manufacturing capabilities. The world's top biotechnology and pharmaceutical companies are developing new and better therapeutics using Nektar's advanced technologies and know-how. Nektar also develops its own products by applying its drug delivery technologies and expertise to existing medicines to enhance performance, such as improving efficacy, safety and patient compliance.