Transaction in Own Shares

BP PLC
29 July 2005

BP p.l.c.  -  Transaction in Own Shares

BP p.l.c.  -  29 July 2005

BP p.l.c. announces that on 28 July 2005, it purchased 11,910,000 ordinary
shares at prices between 626.00 pence and 636.50 pence per share and between
1102.33 cents and 1114.17 cents per share. The purchased shares will all be held
as Treasury shares.

Following the above purchase, BP p.l.c. holds 471,207,724 ordinary shares in
Treasury, and has 21,031,171,079 ordinary shares in issue (excluding Treasury
shares).

Enquiries: Fergus MacLeod, BP p.l.c.    Tel : [phone]


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