Result of AGM

PREMIER OIL plc

("Premier" or "the Company")

Result of AGM

20 May 2011

Premier announces that at the company's Annual General Meeting (AGM) held today, all the resolutions contained in the Notice of Meeting and put to the meeting were duly passed. Details of the proxy votes received by the company before the AGM in respect of each resolution are available on the company website www.premier-oil.com.

Of particular note is the approval of resolution 15, to conduct a 4:1 share split (the "Share Split"). An application will now be made to the UK Listing Authority and the London Stock Exchange and if accepted, the Share Split will become effective at 8:00am on 23 May 2011. Once effective, shareholders will hold four Ordinary Shares of 12.5 pence each for every one Ordinary Share of 50 pence each held prior to the Share Split.

Finally, John Orange did not seek re-election at today's board meeting. The board would like to thank John for his outstanding service over the past 14 years. Joe Darby will now replace John as senior independent director and Jane Hinkley will take over chairmanship of the Remuneration Committee.

Enquiries

Premier Oil plc Tel: 020 7730 1111

Simon Lockett

Tony Durrant

Pelham Bell Pottinger PR Tel: 020 7861 3232

Gavin Davis

Henry Lerwill