| SC 13G | 2002-10-09 | FRANKLIN RESOURCES INC | ASPEN TECHNOLOGY INC /DE/ | 4,011,047 | 10.5% | EDGAR |
| SC 13G/A | 2002-08-08 | TCW GROUP INC | ASPEN TECHNOLOGY INC /DE/ | 5,590,852 | 15.8% | EDGAR |
| SC 13G | 2002-06-07 | TCW GROUP INC | ASPEN TECHNOLOGY INC /DE/ | 3,625,850 | 10.2% | EDGAR |
| SC 13G | 2002-05-20 | CAVALLO CAPITAL CORP | ASPEN TECHNOLOGY INC /DE/ | 2,940,100 | 8.1% | EDGAR |
| SC 13G | 2002-02-14 | MASSACHUSETTS CAPITAL RESOURCE CO | ASPEN TECHNOLOGY INC /DE/ | 1,603,450 | 5.1% | EDGAR |
| SC 13G/A | 2002-02-11 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | ASPEN TECHNOLOGY INC /DE/ | 2,252,912 | 7.1% | EDGAR |
| SC 13G | 2002-02-11 | CAPITAL RESEARCH & MANAGEMENT CO | ASPEN TECHNOLOGY INC /DE/ | 1,725,000 | 5.5% | EDGAR |
| SC 13G/A | 2001-06-04 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | ASPEN TECHNOLOGY INC /DE/ | 3,122,207 | 10.3% | EDGAR |
| SC 13G/A | 2001-02-09 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | ASPEN TECHNOLOGY INC /DE/ | 2,869,297 | 9.7% | EDGAR |
| SC 13G/A | 2000-04-10 | MORGAN J P & CO INC | ASPEN TECHNOLOGY INC /DE/ | 969,316 | 3.7% | EDGAR |
| SC 13G | 2000-03-09 | MORGAN J P & CO INC | ASPEN TECHNOLOGY INC /DE/ | 1,322,741 | 5.1% | EDGAR |
| SC 13G | 2000-03-09 | MORGAN J P & CO INC | ASPEN TECHNOLOGY INC /DE/ | 1,322,741 | 5.1% | EDGAR |
| SC 13G | 2000-03-09 | MORGAN J P & CO INC | ASPEN TECHNOLOGY INC /DE/ | 1,322,741 | 5.1% | EDGAR |
| SC 13G | 2000-02-09 | MASSACHUSETTS CAPITAL RESOURCE CO | ASPEN TECHNOLOGY INC /DE/ | 9 | 11.0% | EDGAR |
| SC 13G | 2000-02-09 | MASSACHUSETTS CAPITAL RESOURCE CO | ASPEN TECHNOLOGY INC /DE/ | 9 | 11.0% | EDGAR |
| SC 13G | 2000-02-09 | MASSACHUSETTS CAPITAL RESOURCE CO | ASPEN TECHNOLOGY INC /DE/ | 9 | 11.0% | EDGAR |
| SC 13G/A | 2000-02-08 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | ASPEN TECHNOLOGY INC /DE/ | 3,158,362 | 12.6% | EDGAR |
| SC 13G/A | 2000-02-08 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | ASPEN TECHNOLOGY INC /DE/ | 3,158,362 | 12.6% | EDGAR |
| SC 13G/A | 2000-02-08 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | ASPEN TECHNOLOGY INC /DE/ | 3,158,362 | 12.6% | EDGAR |
| SC 13G/A | 2000-01-11 | THOMSON HORSTMANN & BRYANT INC | ASPEN TECHNOLOGY INC /DE/ | 1,202,300 | 4.8% | EDGAR |