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Form SC 13G - Statement of Beneficial Ownership by Certain Investors:
SEC Accession No. 0000950137-99-000326
Filing Date
1999-03-17
Accepted
1999-03-17 00:00:00
Documents
1

Document Format Files

Seq Description Document Type Size
1 SCHEDULE 13G SC 13G 17220
  Complete submission text file 0000950137-99-000326.txt   19149
Mailing Address 222 WEST ADAMS CHICAGO IL 60606
Business Address 222 WEST ADAMS ST 34TH FLOOR CHICAGO IL 60606-5312 3122361600
BLAIR WILLIAM & CO/IL (Filed by) CIK: 0000902367 (see all company filings)

IRS No.: 362214610 | State of Incorp.: IL | Fiscal Year End: 1231
SIC: 0000

Mailing Address TEN CANAL PK CAMBRIDGE MA 02141
Business Address TEN CANAL PARK CAMBRIDGE MA 02141 6179491000
ASPEN TECHNOLOGY INC /DE/ (Subject) CIK: 0000929940 (see all company filings)

IRS No.: 042739697 | State of Incorp.: DE | Fiscal Year End: 0630
Type: SC 13G | Act: 34 | File No.: 005-44607 | Film No.: 99566620
SIC: 7371 Services-Computer Programming Services