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Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC Feb 9, 2022 03:30PM
Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC Feb 10, 2021 10:33AM
Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC Feb 12, 2020 08:04AM
Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC Feb 11, 2019 09:58AM
Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC Nov 13, 2018 08:13AM


Feb 12, 2018 08:44AM Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC
Mar 10, 2017 12:52PM Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC
Feb 9, 2017 02:30PM Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC
Feb 10, 2016 03:19PM Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC
Feb 10, 2015 02:30PM Form SC 13G/A ASPEN TECHNOLOGY INC Filed by: VANGUARD GROUP INC
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