ASPEN TECHNOLOGY INC

CUSIP: 045327103 Class: COM

MASON STREET ADVISORS, LLC's Holding History (CIK: 0001167711)

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

Q4 2014
Shares 120,370 Value ($000) $4,215 Avg Close — Range —
Q3 2014
Shares 126,470 Value ($000) $4,770 Avg Close — Range —
Q2 2014
Shares 126,470 Value ($000) $5,868 Avg Close — Range —
Q1 2014
Shares 126,470 Value ($000) $5,357 Avg Close — Range —
Q4 2013
Shares 126,470 Value ($000) $5,286 Avg Close — Range —
Q3 2013
Shares 130,310 Value ($000) $4,502 Avg Close — Range —
Q2 2013
Shares 175,350 Value ($000) $5,048 Avg Close — Range —