ASPEN TECHNOLOGY INC

CUSIP: 045327103 Class: COM

GW&K Investment Management, LLC's Holding History (CIK: 0001082917)

Note: Option positions (PUT/CALL) are excluded.

Q4 2015
Shares 789,675 Value ($000) $29,818 Avg Close — Range —
Q3 2015
Shares 846,362 Value ($000) $32,086 Avg Close — Range —
Q2 2015
Shares 1,079,683 Value ($000) $49,180 Avg Close — Range —
Q1 2015
Shares 1,086,442 Value ($000) $41,817 Avg Close — Range —
Q4 2014
Shares 76,355 Value ($000) $2,674 Avg Close — Range —
Q3 2014
Shares 66,575 Value ($000) $2,511 Avg Close — Range —
Q2 2014
Shares 51,540 Value ($000) $2,391 Avg Close — Range —
Q1 2014
Shares 31,355 Value ($000) $1,328 Avg Close — Range —
Q4 2013
Shares 27,230 Value ($000) $1,138 Avg Close — Range —
Q3 2013
Shares 22,175 Value ($000) $766 Avg Close — Range —
Q2 2013
Shares 9,655 Value ($000) $278 Avg Close — Range —