18  Treasury shares

Number
of shares

2017
value
CHF million

Number
of shares

2016
value
CHF million

Market value as at 1 January

12 000

1.8

33 220

4.5

Purchases

164 174

27.6

130 555

18.3

Sales

–146 646

–24.7

–151 775

–21.1

Income on treasury shares as at 31 December

0.2

0.1

Market value as at 31 December

29 528

4.9

12 000

1.8