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

SAN CARLOS, Calif. -- Nektar Therapeutics (Nasdaq:NKTR) will announce its financial results for the first quarter ended March 31, 2005, on Monday, May 9, 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 at Nektar's website at http://www.nektar.com. The web broadcast of the conference call will be available for replay through May 23, 2005.

Analysts and investors can also access the conference call live via telephone by dialing 888-862-6557 (U.S.); 630-691-2748 (International). The confirmation number is 11623102 and the host is Mr. Ajit Gill. An audio replay will be available shortly following the call through May 23, and can be accessed by dialing 877-213-9653 (U.S.); or 630-652-3041 (International) with a passcode of 11623102. 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.