Summary of INSITUFORM TECHNOLOGIES INC

Item 2.01. Completion of Acquisition or Disposition of Assets.

As previously reported on the Current Report on Form 8-K, filed on April 3, 2009, Insituform Technologies, Inc. announced on March 31, 2009 that it had completed its previously announced acquisition by merger of Corrpro Companies, Inc.

This Form 8-K/A amends the Current Report on Form 8-K filed on April 3, 2009 to include the required financial statements of the business acquired and pro forma financial information.

Item 9.01. Financial Statements and Exhibits.

(a) Financial statements of business acquired:

The required financial statements of Corrpro Companies, Inc. are incorporated by reference as Exhibit 99.1 from Insituform Technologies, Inc.'s Registration Statement on Form S-3 (File No. 333-154716) and Exhibit 99.2 is attached hereto and such financial statements are incorporated in their entirety herein by reference.

(b) Pro forma financial information:

The required pro forma financial information is attached hereto as Exhibit 99.4 and is incorporated in its entirety herein by reference.

(d) The following exhibits are filed as part of this report:

Exhibit No.       Description of Exhibit
23.1              Consent of Grant Thornton LLP.

23.2              Consent of PricewaterhouseCoopers LLP.

23.3              Consent of Castaing Hussey & Lolan, LLC.

99.1              Consolidated Financial Statements of Corrpro Companies, Inc. as
                  of March 31, 2008 and 2007 and for the years ended March 31,
                  2008, 2007 and 2006 together with the independent auditor's
                  report of Grant Thornton LLP (incorporated by reference from the
                  Registrant's Registration Statement on Form S-3 (File No.
                  333-154716)).

99.2              Unaudited Consolidated Financial Statements of Corrpro Companies,
                  Inc. as of December 31, 2008 and for the nine months ended
                  December 31, 2008 and 2007.

99.3              Consolidated Financial Statements of The Bayou Companies, L.L.C.
                  as of December 31, 2008 and for the year ended December 31, 2008
                  together with independent auditor's report of
                  PricewaterhouseCoopers LLP.

99.4              Pro Forma Unaudited Financial Statements of Insituform
                  Technologies, Inc., Corrpro Companies, Inc. and The Bayou
                  Companies, L.L.C. as of December 31, 2008 and for the year ended
                  December 31, 2008.

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