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Earnings per share and shares outstanding
 12 Months Ended
Dec. 31, 2019
Earnings Per Share And Shares Outstanding [Line Items]  
Disclosure of earnings per share and shares outstanding [text block]

Note 9 Earnings per share (EPS) and shares outstanding

As of or for the year ended
31.12.1931.12.1831.12.17
Basic earnings (USD million)
Net profit / (loss) attributable to shareholders 4,304 4,516 969
Diluted earnings (USD million)
Net profit / (loss) attributable to shareholders 4,304 4,516 969
Less: (profit) / loss on own equity derivative contracts 0 (2) 0
Net profit / (loss) attributable to shareholders for diluted EPS 4,304 4,514 969
Weighted average shares outstanding
Weighted average shares outstanding for basic EPS1 3,663,278,238 3,730,297,877 3,716,174,261
Effect of dilutive potential shares resulting from notional shares, in-the-money options and warrants outstanding 103,881,600 111,271,269 120,540,272
Weighted average shares outstanding for diluted EPS 3,767,159,838 3,841,569,146 3,836,714,533
Earnings per share (USD)
Basic 1.17 1.21 0.26
Diluted 1.14 1.18 0.25
Shares outstanding
Shares issued 3,859,055,395 3,855,634,749 3,853,096,603
Treasury shares 243,021,296 166,467,802 132,301,550
Shares outstanding 3,616,034,099 3,689,166,947 3,720,795,053
1 The weighted average shares outstanding for basic EPS are calculated by taking the number of shares at the beginning of the period, adjusted by the number of shares acquired or issued during the period, multiplied by a time-weighted factor for the period outstanding. As a result, balances are affected by the timing of acquisitions and issuances during the period.

The table below outlines the potential shares which could dilute basic earnings per share in the future, but were not dilutive for the periods presented.

Number of shares31.12.1931.12.1831.12.17
Potentially dilutive instruments
Employee share-based compensation awards1 3,605,198 24,124,341
Other equity derivative contracts 21,632,879 11,912,450 9,122,496
Total 21,632,879 15,517,648 33,246,837
1 The last remaining option awards and stock appreciation rights expired during 2019.
UBS AG  
Earnings Per Share And Shares Outstanding [Line Items]  
Disclosure of earnings per share and shares outstanding [text block]

Note 9 Earnings per share (EPS) and shares outstanding

In 2015, UBS AG shares were delisted from the SIX Swiss Exchange and the New York Stock Exchange. As of 31 December 2019, 100% of UBS AG’s issued shares were held by UBS Group AG and therefore were not publicly traded. Accordingly, earnings per share information is not provided for UBS AG.