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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Stockholders' Equity Note [Abstract]

Roll-forward of changes in issued and outstanding Common Shares

The following table presents a roll-forward of changes in Arch Capital’s issued and outstanding Common Shares:

			Year Ended December 31,
			2021						2020						2019
Common Shares:
Shares issued and outstanding, beginning of year			579,000,841						574,617,195						570,737,283
Shares issued (1)			2,669,229						2,646,164						2,835,994
Restricted shares issued, net of cancellations			1,619,780						1,737,482						1,043,918
Shares issued and outstanding, end of year			583,289,850						579,000,841						574,617,195
Common shares in treasury, end of year			(204,365,956)						(172,280,199)						(168,997,994)
Shares issued and outstanding, end of year			378,923,894						406,720,642						405,619,201

(1)    Includes shares issued from the exercise of stock options and stock appreciation rights, the vesting of restricted share units and shares issued from the employee share purchase plan.

Schedule of share repurchases

The Company’s repurchases under the share repurchase program were as follows:

			Year Ended December 31,
			2021						2020						2019
Aggregate cost of shares repurchased			$	1,234,294					$	83,472					$	2,871
Shares repurchased			31,486,830						2,850,102						110,598
Average price per share repurchased			$	39.20					$	29.29					$	25.96

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