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Shares in issue and share buybacks

Shares in issue is the number of Ordinary shares outstanding at the end of the period shown. The ADR equivalent is equal to the number of Ordinary shares divided by six
Shares in issue (a)
3Q18 2Q18
1Q18
4Q17
3Q17
Shares in issue at period end (thousand) 20,050,414 19,973,943
19,973,943
19,817,325
19,797,657
ADS equivalent (thousand) 3,341,735 3.328,990 3,323,931 3,302,887 3,299,609
Average number of shares outstanding (thousand); discrete 20,006,872
19,945,053
19,945,053
19,918,700
19,804,932
ADS equivalent (thousand); discrete 3,334,478 3.324,175 3,319,783 3,300,822 3,292,686

(a) Excludes treasury shares and includes certain shares that will be issued in the future under employee share-based payment plans.

Share buybacks refers to purchases made by the company of BP ordinary shares, for Treasury shares or subsequent cancellation. Cash can be returned to shareholders both through the dividend (paid quarterly) and by means of the buyback programme.

Share buybacks
Number of shares (million)
Total cost in $ (US$ million)
Total in 2000
222
2,001
Total in 2001 154
1,281
Total in 2002  100 750
Total in 2003 299  1,999
Total in 2004 827  7,548
Total in 2005  1,060 11,597
Total in 2006 1,334 15,481
Total in 2007 663 7,497
Total in 2008 270 2,914
Total in 2009 0 0
Total in 2010 0 0
Total in 2011 0 0
Total in 2012 0 0
Total in 2013 753 5,493
Total in 2014 612 4,796
Total in 2015 0 0
Total in 2016 0 0
Total in 2017 51 343
Total in 2018 50 355
Total since 2000* 6,395 62,056

*Because of rounding, the totals may not agree exactly with the sum of their component parts.

Shares bought back between 8th February 2005 and 20th September 2006 were placed in Treasury for use in BP's employee share schemes.

Please see the link below for recent regulatory announcements and details of transactions in own shares.