Document:

Exhibit 10.2  

	 	 	Aspen Technology, Inc. Ten Canal Park	 	[phone] 617 949 1000	 	[world wide web] www.aspentech.com
	 	 	Cambridge MA 02141-2201 USA	 	[fax] 617 949 1030	 	[e-mail] info@aspentech.com

[ASPENTECH LOGO] 

June 16,
2003 

Charles
F. Kane

8 Benson Road

Hopkinton, MA 01748 

Dear
Chuck: 

        I
am delighted to offer you the position of Senior VP & Chief Financial Officer. Your starting annual salary will be $250,000 ($10,416.67 semi-monthly). You will
report to David McQuillin, President and Chief Executive Officer. Your official start date will be July 1, 2003. 

        You
will have a bonus potential equal to 40% of your base salary. 

        You
will receive an option to purchase 150,000 shares of AspenTech Common Stock, or a participation level of approximately 0.38% of the current common shares outstanding, upon approval
by the
AspenTech Compensation Committee. These stock options will vest at 1/16 at the end of each calendar quarter, beginning with the first full quarter following the date of grant, but would
exclude accelerated vesting triggered by the expected transaction with Advent International (the "Advent Financing"). These shares will be granted between your start date and the shareholder vote for
the Advent Financing transaction. Upon approval of the Advent Financing transaction by shareholders, you will be given an additional option grant to maintain your participation level based on the new
post-transaction fully diluted common shares outstanding. This additional grant would be made on the day following the successful approval of the Advent Financing transaction. 

        Within
your first two years with AspenTech, should your employment be terminated for any reason other than cause, you will be eligible to receive payment equal to six (6) months
of salary payable over such period. 

        You
will also be eligible to receive AspenTech's standard employee benefits including paid vacation, paid holidays, life, AD&D, long-term disability insurance, PPO medical
and dental plans, 401K plan, and Employee Stock Purchase Plan. Additional information regarding these plans is contained in plan documents and summaries that you will be provided. All benefits under
these and any other company compensation or benefit plans are subject to the terms and conditions stated in the plan documents and summaries. The company reserves the right to modify, amend, or
terminate any compensation or benefit plan at any time in its sole discretion. 

        Please
confirm your acceptance of this employment offer by signing a copy of this letter and returning it to me in the enclosed envelope by June 19, 2003. Also, please review the
enclosed Confidentiality Agreement and I-9 form and bring them with you, with the appropriate documentation, on your first day. You understand and agree that employment with AspenTech is
not for a fixed period of time and it terminable at the will of either AspenTech or you. No contrary representation or promises have been made to you in this letter or otherwise, and no such promise
or representation shall be binding unless in writing and signed by an officer of AspenTech. 

        Chuck,
all of us at AspenTech are enthusiastic about the prospect of your joining the Company. Please ask for Andrea Higgins at the Cambridge, MA office at 9:00am on July 1, 2003
for new employee orientation. 

Sincerely, 

Aspen Technology, Inc.  

/s/ Linda S. Hevenor 

Linda
S. Hevenor

Human Resources Manager 

Accepted
and Agreed to: 

	/s/ Charles F. Kane
 Charles F. Kane	 	June 16, 2003
 Date
	 	 	 

	Enclosures:	 	Duplicate copy of letter for your file

Confidentiality and Non-Compete Agreements

I-9

Summary of Benefits

Return EnvelopeExhibit 10.3  

	 	 	Aspen Technology, Inc. Ten Canal Park	 	[phone] 617 949 1000	 	[world wide web] www.aspentech.com
	 	 	Cambridge MA 02141-2201 USA	 	[fax] 617 949 1030	 	[e-mail] info@aspentech.com

[ASPENTECH LOGO] 

June 24,
2003 

Mr. David
McQuillin

President & CEO 

Dear
David: 

        I
am pleased to confirm that the Compensation Committee of the AspenTech Board of Directors has approved the following FY04 Executive Compensation Plan for you. This Plan is contingent
upon shareholder approval of the Advent financing transaction, which is currently scheduled for August 2003. 

        Your
total target compensation for FY04 will be $700,000, which is comprised of a base salary of $350,000 and a bonus target of 100%. The actual bonus you earn will be determined by your
achievement of FY04 goals. I will communicate the details of the FY04 bonus program to you in early Q1 once the program has been finalized and approved by the Compensation Committee. 

        In
addition, you will be granted options to purchase 1,891,600 shares of AspenTech common stock at the Fair Market Value on the day the Advent transaction is approved by shareholders.
This grant, together with your existing option holdings, would bring your total equity participation level to approximately 2.500%, based on options with grant prices of $10/share or lower on a
pre-reverse split basis. In consideration for this substantial new grant, the following condition applies, contingent upon closing of the Advent transaction and issuance of the options: 

	•
	For
your existing stock options with pre-split grant prices of $10/share or lower, you agree to only exercise these options in accordance with their normal
vesting schedule. In the event of your involuntary termination, or a change of control event as redefined in the 2001/2003 stock option plan and described in the proxy statement for the Advent
transaction, this restriction will be lifted. 

        David,
I look forward to our continued work together as we drive shareholder value. 

Best
regards, 

	/s/ Helen Moye
 Helen Moye

Sr. VP Human Resources

Aspen Technology, Inc.	 	/s/ David McQuillin
 David McQuillin

President & CEO	 	June 24, 2003
 DateExhibit 10.4  

	 	 	Aspen Technology, Inc. Ten Canal Park	 	[phone] 617 949 1000	 	[world wide web] www.aspentech.com
	 	 	Cambridge MA 02141-2201 USA	 	[fax] 617 949 1030	 	[e-mail] info@aspentech.com

[ASPENTECH LOGO] 

June 24,
2003 

Mr. Stephen
Doyle

General Counsel and Chief Strategy Officer 

Dear
Steve: 

        I
am pleased to confirm that the Compensation Committee of the AspenTech Board of Directors has approved the following FY04 Executive Compensation Plan for you. This Plan is contingent
upon shareholder approval of the Advent financing transaction, which is currently scheduled for August 2003. 

        Your
total target compensation for FY04 will be $338,000, which is comprised of a base salary of $250,000 and a bonus target of 35%. The actual bonus you earn will be determined by your
achievement of FY04 goals. I will communicate the details of the FY04 bonus program to you in early Q1 once the program has been finalized and approved by the Compensation Committee. 

        In
addition, you will be granted options to purchase 283,400 shares of AspenTech common stock at the Fair Market Value on the day the Advent transaction is approved by shareholders. This
grant, together with your existing option holdings, would bring your total equity participation level to approximately 0.350%, based on options with grant prices of $10/share or lower on a
pre-reverse split basis. In consideration for this substantial new grant, the following conditions apply, contingent upon closing of the Advent transaction and issuance of the options: 

	•
	For
your existing stock options with pre-split grant prices of $10/share or lower, you agree to only exercise these options in accordance with their normal
vesting schedule. In the event of your involuntary termination, or a change of control event as redefined in the 2001/2003 stock option plan and described in the proxy statement for the Advent
transaction, this restriction will be lifted.

	•
	Your
existing 12-18 month termination agreement will be cancelled.

	•
	Your
current personal Change of Control agreement will be modified as follows. Upon closing of the Advent transaction your existing agreement automatically amends to a
three-year term pursuant to its current terms and conditions. Upon issuance of the option grant to purchase 283,400 shares referred to above and the implementation of the compensation
plan, your agreement will be amended to: (1) change the term to a set term of three years, without an automatic renewal feature, from the day of the approval of the Advent transaction by
shareholders ("Approval Date"), and (2) amend section 3.2 of your agreement to provide for two times the sum stated therein for the first year beginning with the Approval Date, and one
times the sum stated therein for the remaining two years. 

        Steve,
I look forward to our continued work together as we drive shareholder value. 

Best
regards, 

	/s/ David L. McQuillin
 David L. McQuillin

President and CEO

Aspen Technology, Inc.	 	/s/ Stephen Doyle
 Stephen Doyle

General Counsel and Chief Strategy Officer

Aspen Technology, Inc.	 	June 24, 2003
 DateExhibit 10.5  

	 	 	Aspen Technology, Inc. Ten Canal Park	 	[phone] 617 949 1000	 	[world wide web] www.aspentech.com
	 	 	Cambridge MA 02141-2201 USA	 	[fax] 617 949 1030	 	[e-mail] info@aspentech.com

[ASPENTECH LOGO] 

June 24,
2003 

Mr. Manolis
Kotzabasakis

Senior VP Engineering Product Business Unit (PBU) 

Dear
Manolis: 

        I
am pleased to confirm that the Compensation Committee of the AspenTech Board of Directors has approved the following FY04 Executive Compensation Plan for you. This Plan is contingent
upon shareholder approval of the Advent financing transaction, which is currently scheduled for August 2003. 

        Your
total target compensation for FY04 will be $334,000, which is comprised of a base salary of $230,000 and a bonus target of 45%. The actual bonus you earn will be determined by your
achievement of FY04 goals. I will communicate the details of the FY04 bonus program to you in early Q1 once the program has been finalized and approved by the Compensation Committee. 

        In
the event your employment is terminated other than for cause prior to June 24, 2006, you will be entitled to receive severance in an amount equal to your annual base salary
then in effect, payable over 12 months in accordance with AspenTech's semi-monthly payroll schedule. 

        In
addition, you will be granted options to purchase 331,700 shares of AspenTech common stock at the Fair Market Value on the day the Advent transaction is approved by shareholders. This
grant, together with your existing option holdings, would bring your total equity participation level to approximately 0.400%, based on options with grant prices of $10/share or lower on a
pre-reverse split basis. In consideration for this substantial new grant, the following condition applies, contingent upon closing of the Advent transaction and issuance of the options: 

	•
	For
your existing stock options with pre-split grant prices of $10/share or lower, you agree to only exercise these options in accordance with their normal
vesting schedule. In the event of your involuntary termination, or a change of control event as redefined in the 2001/2003 stock option plan and described in the proxy statement for the Advent
transaction, this restriction will be lifted. 

        Manolis,
I look forward to our continued work together as we drive shareholder value. 

Best
regards, 

	/s/ David L. McQuillin
 David L. McQuillin

President and CEO

Aspen Technology, Inc.	 	/s/ Manolis Kotzabasakis
 Manolis Kotzabasakis

Senior VP Engineering PBU

Aspen Technology, Inc.	 	June 24, 2003
 Date

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