0001193125-16-460216 SC 13G/A 1 20160212 20160211 2U, Inc. 0001459417 7372 262335939 DE 1231 SC 13G/A 34 005-88512 161413251 8201 CORPORATE DRIVE, SUITE 110 LANDOVER MD 20785 240-487-3991 8201 CORPORATE DRIVE, SUITE 110 LANDOVER MD 20785 2tor, Inc. 20090324 FRONTIER CAPITAL MANAGEMENT CO LLC 0001216488 043492668 DE SC 13G/A 99 SUMMER STREET BOSTON MA 02110 SC 13G/A 1 d119985dsc13ga.htm SCHEDULE 13G AMENDMENT NO. 1