Basic earnings per share is calculated by dividing the net profit attributable to equity holders of the Company by the weighted average number of ordinary shares outstanding during the financial year.

		2025 US$’000				2024 US$’000				2023 US$’000
Net profit attributable to equity holders of the Company			339,682				774,035				793,275

(a)	Basic earnings per share

			2025				2024				2023
Number of shares
Issued common shares at 1 January			512,563,532				506,820,170				503,388,593
Effect of share options exercised satisfied from treasury shares			12,352,736				10,849,214				5,308,923
Effect of new shares issued			—				4,609,675				2,876,884
Effect of treasury shares purchased			(26,738,326	)			(12,181,501	)			(6,430,681	)
Weighted-average number of ordinary shares at 31 December			498,177,942				510,097,558				505,143,719
Basic earnings per share (US$ per share)			0.68				1.52				1.57

​			2025				2024				2023
Number of shares
Weighted-average number of ordinary shares (basic)			498,177,942				510,097,558				505,143,719
Effect of share options on issue			5,935,695				5,010,957				3,544,217
Weighted-average number of ordinary shares at 31 December			504,113,637				515,108,515				508,687,936
Diluted earnings per share (US$ per share)			0.67				1.50				1.56

Diluted earnings per share is determined by adjusting profit or loss attributable to ordinary shareholders and the weighted average number of ordinary shares outstanding, adjusted for own shares held, and the effects of all dilutive potential ordinary shares, which comprise share options and restricted share units granted to employees.

The average market value of the Company’s shares for purposes of calculating the dilutive effect of share options was based on quoted market prices for the period during which the options were outstanding.