Exhibit 10.1 Confidential Materials omitted and filed separately with the Securities and Exchange Commission. Asterisks denote omissions. PURCHASE AND SALE AGREEMENTPurchase and Sale Agreement • March 15th, 2005 • Aspen Technology Inc /De/ • Services-computer programming services • New York
Exhibit 10.8 THIRD AMENDMENT TO NON-RECOURSE RECEIVABLES PURCHASE AGREEMENT This Third Amendment to Non-Recourse Receivables Purchase Agreement (this "Amendment") is entered into as of December 31, 2004, by and between SILICON VALLEY BANK, a...Receivables Purchase Agreement • March 15th, 2005 • Aspen Technology Inc /De/ • Services-computer programming services
Exhibit 10.5 Confidential Materials omitted and filed separately with the Securities and Exchange Commission. Asterisks denote omissions. HYPROTECH CANADA LICENSE AGREEMENT THIS HYPROTECH LICENSE AGREEMENT (the "AGREEMENT") is made and entered into as...Hyprotech Canada License Agreement • March 15th, 2005 • Aspen Technology Inc /De/ • Services-computer programming services • New York
AMENDMENT NO. 1Aspen Technology Inc /De/ • March 15th, 2005 • Services-computer programming services
EXHIBIT 10.3 Confidential Materials omitted and filed separately with the Securities and Exchange Commission. Asterisks denote omissions. ASPEN TECHNOLOGY LICENSE AGREEMENT THIS HYPROTECH LICENSE AGREEMENT (the "AGREEMENT") is made and entered into as...Technology License Agreement • March 15th, 2005 • Aspen Technology Inc /De/ • Services-computer programming services • New York
Exhibit 10.7 Confidential Materials omitted and filed separately with the Securities and Exchange Commission. Asterisks denote omissions. ASPENTECH UK LICENSE AGREEMENT THIS HYPROTECH LICENSE AGREEMENT (the "AGREEMENT") is made and entered into as of...License Agreement • March 15th, 2005 • Aspen Technology Inc /De/ • Services-computer programming services • New York
Exhibit 10.6 Confidential Materials omitted and filed separately with the Securities and Exchange Commission. Asterisks denote omissions. HYPROTECH UK LICENSE AGREEMENT THIS HYPROTECH LICENSE AGREEMENT (the "AGREEMENT") is made and entered into as of...License Agreement • March 15th, 2005 • Aspen Technology Inc /De/ • Services-computer programming services • New York
Exhibit 10.4 Confidential Materials omitted and filed separately with the Securities and Exchange Commission. Asterisks denote omissions. ASPENTECH CANADA LICENSE AGREEMENT THIS HYPROTECH LICENSE AGREEMENT (the "AGREEMENT") is made and entered into as...Canada License Agreement • March 15th, 2005 • Aspen Technology Inc /De/ • Services-computer programming services • New York
