A. Mary Martin

Insider Trading: Sales

Symbol	Price	Amount	Total Value	Remaining Holdings	Date	Form 4
[USG]	$32.65	8,000	$261,171.20	19,836	2017-02-13	Filing
[USG]	$28.20	5,000	$141,021.50	21,211	2016-05-16	Filing
USG	$28.70	13,315	$382,100.56	17,038	2013-05-22	Filing
USG	$24.77	6,027	$149,296.63	29,256	2012-12-06	Filing