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| 
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 | Snam shareholders’ equity | 
 | 
 | ||||||||||
| (€ million) | 
 | Share capital | Consoli-dation reserve | Share premium reserve | Legal reserve | Cash flow hedge reserve | Other reserves | Retained earnings | Net profit | Treasury shares | Interim dividend | Total | Capital and reserves attribut- | Total share- | 
| Shareholders’ equity at 31 December 2009 | 3,570 | (1,586) | 1,978 | 391 | (52) | 794 | 870 | 732 | (792) | (203) | 5,702 | 1 | 5,703 | |
| Transactions with shareholders: | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | |
| - Dividend distribution (€0.14 per share to balance the 2009 interim dividend of €0.06 per share) | 
 | 
 | 
 | 
 | 
 | 
 | 
 | (675) | 
 | 203 | (472) | 
 | (472) | |
| - Allocation of 2009 residual net profit | 
 | 
 | 
 | 27 | 
 | 
 | 30 | (57) | 
 | 
 | 
 | 
 | 
 | |
| - 2010 interim dividend (€0.09 per share) | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | (304) | (304) | 
 | (304) | |
| - Disposal of treasury shares for stock option plans | 
 | 
 | 3 | 
 | 
 | (3) | 
 | 
 | 3 | 
 | 3 | 
 | 3 | |
| 
 | 
 | 
 | 3 | 27 | 
 | (3) | 30 | (732) | 3 | (101) | (773) | 
 | (773) | |
| Comprehensive income 2010 | 
 | 
 | 
 | 
 | 3 | 
 | 
 | 1,106 | 
 | 
 | 1,109 | 
 | 1,109 | |
| Other changes in shareholders’ equity: | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | |
| - Impact of Italgas and Stogit acquisition | 
 | (127) | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | (127) | 
 | (127) | |
| - Difference between book value of shares sold and strike price of stock options exercised by executives | 
 | 
 | 
 | 
 | 
 | 
 | (1) | 
 | 
 | 
 | (1) | 
 | (1) | |
| - Equity method valuation effect | 
 | 
 | 
 | 
 | 
 | 
 | 5 | 
 | 
 | 
 | 5 | 
 | 5 | |
| 
 | 
 | 
 | (127) | 
 | 
 | 
 | 
 | 4 | 
 | 
 | 
 | (123) | 
 | (123) | 
| Shareholders’ equity at 31 December 2010 | (Note 27) | 3,570 | (1,713) | 1,981 | 418 | (49) | 791 | 904 | 1,106 | (789) | (304) | 5,915 | 1 | 5,916 | 
| Transactions with shareholders: | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | |
| - Dividend distribution (€0.14 per share to balance the 2010 interim dividend of €0.09 per share) | 
 | 
 | 
 | 
 | 
 | 
 | 
 | (777) | 
 | 304 | (473) | 
 | (473) | |
| - Allocation of 2010 residual net profit | 
 | 
 | 
 | 45 | 
 | 
 | 284 | (329) | 
 | 
 | 
 | 
 | 
 | |
| - 2011 interim dividend (€0.10 per share) | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | (338) | (338) | 
 | (338) | |
| - Capital increase for stock option plans | 1 | 
 | 1 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 2 | 
 | 2 | |
| - Disposal of treasury shares for stock option plans | 
 | 
 | 6 | 
 | 
 | (6) | 
 | 
 | 6 | 
 | 6 | 
 | 6 | |
| 
 | 1 | 
 | 7 | 45 | 
 | (6) | 284 | (1,106) | 6 | (34) | (803) | 
 | (803) | |
| Comprehensive income 2011 | 
 | 
 | 
 | 
 | (121) | 
 | 
 | 790 | 
 | 
 | 669 | 
 | 669 | |
| Other changes in shareholders’ equity: | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | |
| - Impact of Italgas and Stogit acquisition | 
 | 12 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 12 | 
 | 12 | |
| - Difference between book value of shares sold and strike price of stock options exercised by executives | 
 | 
 | 
 | 
 | 
 | 
 | (1) | 
 | 
 | 
 | (1) | 
 | (1) | |
| - Acquisition of business units | 
 | 
 | 
 | 
 | 
 | (2) | 
 | 
 | 
 | 
 | (2) | 
 | (2) | |
| - Adjustment for prepaid IRES (Robin Hood Tax) charges through increase of share capital | 
 | 
 | 
 | 
 | 
 | 
 | 1 | 
 | 
 | 
 | 1 | 
 | 
 | |
| 
 | 
 | 
 | 12 | 
 | 
 | 
 | (2) | 
 | 
 | 
 | 
 | 10 | 
 | 10 | 
| Shareholders’ equity at 31 December 2011 | (Note 27) | 3,571 | (1,701) | 1,988 | 463 | (170) | 783 | 1,188 | 790 | (783) | (338) | 5,791 | 1 | 5,792 | 



