X0202 4 2006-04-26 0 0000353020 INSITUFORM TECHNOLOGIES INC INSU 0001187134 HINSHAW JUANITA H C/O INSITUFORM TECHNOLOGIES, INC. 702 SPIRIT 40 PARK DRIVE CHESTERFIELD MO 63005 1 0 0 0 Deferred stock unit 2006-04-26 4 A 0 3200 A Class A common stock, $.01 par value 3200 12725 D Each deferred stock unit ("DSU") represents the issuer's obligation to transfer one share of Class A common stock, $.01 par value per share ("Common Stock"), in accordance with the terms of the deferred stock unit agreement pursuant to which the DSUs were granted. DSUs are granted under the issuer's Non-Employee Director Equity Incentive Plan, and are immediately vested upon grant. Promptly following termination of the undersigned's service on the issuer's Board of Directors, the issuer will distribute to the undersigned shares of Common Stock equal to the number of DSU's reflected in the undersigned's account at such time. /s/ Suta Tungsiripat, as attorney-in-fact for Juanita H. Hinshaw 2006-04-28