25 results
10-K
2020 FY
EX-4.2
Aspen Technology Inc
Annual report
9 Dec 20
4:37pm
S-8
EX-4.4
Aspen Technology Inc
21 Dec 18
Registration of securities for employees
4:20pm
8-K
EX-4
Aspen Technology Inc
22 Aug 03
Other events
12:00am
8-A12G/A
EX-4.8
Aspen Technology Inc
2 Jun 03
Registration of securities (amended)
12:00am
8-K
EX-4.1
Aspen Technology Inc
2 Jun 03
Other events
12:00am
8-K
EX-4.2
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2 Jun 03
Other events
12:00am
8-A12G/A
EX-4.7
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31 May 02
Registration of securities (amended)
12:00am
8-A12G/A
EX-4.6
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20 Mar 02
Registration of securities (amended)
12:00am
8-K
EX-4.1
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20 Mar 02
Other events
12:00am
8-K
EX-4.2
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20 Mar 02
Other events
12:00am
8-K
EX-4.2
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12 Feb 02
Other events
12:00am
8-A12G/A
EX-4.5
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12 Feb 02
Registration of securities (amended)
12:00am
8-A12G/A
EX-4.4
b8odolo7b3 1p
8 Nov 01
Registration of securities (amended)
12:00am
S-8
EX-4.6
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28 Jul 00
Registration of securities for employees
12:00am
8-K
EX-4.1
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19 Jun 98
Aspen Technology
12:00am
8-A12G/A
EX-4.0
u9gta8b
12 Jun 98
Registration of securities (amended)
12:00am
8-K
EX-4.1
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27 Mar 98
Aspen Technology, Inc.
12:00am
S-8
EX-4.1
8r8wl1535v8y51b9fd
20 Jan 98
Registration of securities for employees
12:00am
8-K
EX-4
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10 Oct 97
Aspen Technology, Inc.
12:00am