Derrell Porter

Insider Trading: Sales

Symbol	Price	Amount	Total Value	Remaining Holdings	Date	Form 4
ATRA	$40.00	5,909	$236,360.00	21,688	2019-02-15	Filing
ATRA	$45.02	16,334	$735,356.68	12,500	2018-05-15	Filing
ATRA	$40.15	1,544	$61,991.60	12,500	2018-05-08	Filing