Transaction in Own Shares

BP p.l.c.

Transaction in own shares

BP p.l.c. announces that on 11 May 2012 it transferred the following number of ordinary shares, which were previously held as treasury shares, to participants in its employee share schemes:

Date of transfer: 11 May 2012

Number of ordinary shares transferred: 713,349

Transfer price per share: £4.04

Following the above transfer, BP p.l.c. holds 1,833,338,585 ordinary shares in treasury, and has 19,021,653,270 ordinary shares in issue (excluding treasury shares).

This announcement is made in accordance with the requirements of Listing Rule 12.6.4.