Shareholders' Equity (Deficit)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Shareholders' Equity

Under its Amended and Restated Certificate of Incorporation, the Company is authorized to issue 300,000,000 shares of common stock, $0.01 par value per share. As of December 31, 2019, the W. R. Grace & Co. 2018 Stock Incentive Plan (together with the 2014 Stock Incentive Plan, collectively, the “Stock Incentive Plans”) had 6,595,567 shares of unissued stock reserved for issuance in the event of the exercise of stock options or the issuance or settlement of stock-based compensation or awards. Shares issuable upon the exercise of stock options or the issuance or settlement of stock-based compensation or awards are covered by reissuing treasury stock, to the extent available; otherwise they are covered through newly issued shares. In 2019, 13,788 common shares were issued to members of the Board of Directors, in partial payment of their annual retainer; 820 shares were issued through net share settlement; and 80,188 shares were issued to settle vested PBUs and vested tranches of RSUs.

The following table sets forth information relating to common stock activity for the years ended December 31, 2019, 2018, and 2017:

(In millions, except shares)	Number of Shares		Aggregate Proceeds
Balance of outstanding shares, December 31, 2016	68,309,431
Stock options exercised	386,300		$	16.4
Shares issued	49,897
Shares forfeited through net share exercise	(29,783	)
Shares repurchased	(935,435	)
Balance of outstanding shares, December 31, 2017	67,780,410
Stock options exercised	243,502		$	6.7
Shares issued	72,590
Shares forfeited through net share exercise	(132,393	)
Shares repurchased	(1,171,141	)
Balance of outstanding shares, December 31, 2018	66,792,968
Stock options exercised	388,174		$	19.1
Shares issued	94,796
Shares forfeited through net share exercise	(130,256	)
Shares repurchased	(409,769	)
Balance of outstanding shares, December 31, 2019	66,735,913