see the notes to consolidated financial statements .
schlumberger limited and subsidiaries shares of common stock ( stated in millions ) issued in treasury shares outstanding .
the stock repurchase program reduced shares outstanding by how many million shares in the period?
the stock repurchase program of issued is 2013 ; the stock repurchase program of in treasury is -27 ( 27 ) ; the stock repurchase program of shares outstanding is -27 ( 27 ) ; the stock repurchase program of issued is 2013 ; the stock repurchase program of in treasury is -37 ( 37 ) ; the stock repurchase program of shares outstanding is -37 ( 37 ) ; the stock repurchase program of issued is 2013 ; the stock repurchase program of in treasury is -14 ( 14 ) ; the stock repurchase program of shares outstanding is -14 ( 14 ) ;
issued in treasury shares outstanding
balance january 1 2010 1334 -139 ( 139 ) 1195
acquisition of smith international inc . 100 76 176
shares sold to optionees less shares exchanged 2013 6 6
shares issued under employee stock purchase plan 2013 3 3
stock repurchase program 2013 -27 ( 27 ) -27 ( 27 )
issued on conversions of debentures 2013 8 8
balance december 31 2010 1434 -73 ( 73 ) 1361
shares sold to optionees less shares exchanged 2013 6 6
vesting of restricted stock 2013 1 1
shares issued under employee stock purchase plan 2013 3 3
stock repurchase program 2013 -37 ( 37 ) -37 ( 37 )
balance december 31 2011 1434 -100 ( 100 ) 1334
shares sold to optionees less shares exchanged 2013 4 4
shares issued under employee stock purchase plan 2013 4 4
stock repurchase program 2013 -14 ( 14 ) -14 ( 14 )
balance december 31 2012 1434 -106 ( 106 ) 1328