Exhibit 4.2

              AMENDMENT NO. 1 TO LOAN AND WARRANT AGREEMENT AND
                       REGISTRATION RIGHTS AGREEMENT



     This AMENDMENT NO. 1 TO LOAN AND WARRANT AGREEMENT AND REGISTRATION
RIGHTS AGREEMENT (this "Amendment") is made and entered into as of April 28,
2006, by and among Zoltek Companies, Inc., a Missouri corporation
("Zoltek"), and the lenders identified on the signature pages hereto (each,
a "Lender" and, collectively, the "Lenders").

                                  RECITALS
                                  --------

     1.   Zoltek and the Lenders are parties to a Loan and Warrant
          Agreement, dated as of September 29, 2005 (the "September Purchase
          Agreement"), pursuant to which Zoltek issued and sold to the
          Lenders an aggregate of $30,000,000 of Notes and certain Warrants
          (each as defined in the September Purchase Agreement), and a right
          to issue up to an additional $20,000,000 of Notes and certain
          Warrants. The Notes and Warrants issued under the September
          Purchase Agreement are referred to in this Amendment as the
          "September Notes" and "September Warrants," respectively.
          Capitalized terms used and not defined in this Amendment shall
          have the respective meanings set forth in the September Purchase
          Agreement.

     2.   Zoltek and the Lenders are parties to a Loan and Warrant
          Agreement, dated as of February 9, 2005 (the "February Purchase
          Agreement" and together with the September Purchase Agreement, the
          "Purchase Agreements"), pursuant to which Zoltek issued and sold
          to the Lenders an aggregate of $20,000,000 of Notes and certain
          Warrants (each as defined in the February Purchase Agreement). The
          Notes and Warrants issued under the February Purchase Agreement
          are referred to as the "February Notes" and "February Warrants,"
          respectively.

     3.   In connection with the September Purchase Agreement, Zoltek and
          the Lenders entered into a Registration Rights Agreement, dated as
          of September 29, 2005 (the "September Registration Rights
          Agreement"), pursuant to which Zoltek undertook certain
          registration obligations to the Lenders.

     4.   In connection with the February Purchase Agreement, Zoltek and the
          Lenders entered into a Registration Rights Agreement, dated as of
          February 9, 2005 (the "February Registration Rights Agreement",
          and together with the September Registration Rights Agreement, the
          "Registration Rights Agreements"), pursuant to which Zoltek
          undertook certain registration obligations to the Lenders.

     5.   Zoltek and the Lenders now wish to further modify certain of the
          terms of the September Purchase Agreement, September Registration
          Rights Agreement, February Purchase Agreement and the February
          Registration Rights Agreement.






     NOW, THEREFORE, in consideration of the foregoing Recitals and other
good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, Zoltek and each Lender, severally and not jointly,
agree as follows:

                                     2




1.   February Notes. Subject to Section 7 and the terms hereof, each Lender
     --------------
     agrees to convert 100% of its February Notes (pertaining to an
     aggregate of $20,000,000 of February Notes) and exercise 100% of its
     February Warrants (pertaining to an aggregate of 457,142 shares of
     Common Stock) and 100% of its warrants issued in connection with the
     2004 Loan Agreement on the Business Day following the date of this
     Amendment.

     1.1 In consideration for such exercise, Zoltek shall issue to each
     Lender a warrant in the form of Exhibit A attached hereto (the
                                     ---------
     "Additional Warrant"), registered in the name of such Lender,
     pursuant to which such Lender shall have the right to acquire the
     number of shares of Common Stock indicated opposite such Lender's
     name on Schedule A hereto under the heading "Additional
     Warrant-Warrant Shares"

     1.2 The parties hereby agree, that the September Warrants triggered
     the anti-dilution provisions under Section 9(d) of the February
     Warrants and as a result the exercise price of the February
     Warrants shall be reduce to $14.50.

2.   Third Closing. - Subject to the terms hereof and Section 7 and
     -------------
     notwithstanding any provision of the September Purchase Agreement to
     the contrary, each Lender and Zoltek agree that the Third Closing Date
     shall occur on the Business Day following the date of the Nasdaq
     Approval (as defined below).

     2.1. In connection with the Third Closing, Zoltek shall issue to each
          Lender (i) a note in the form of Exhibit B-1 hereto (the "April
                                           -----------
          Notes I"), registered in the name of such Lender in the aggregate
          principal amount of the purchase price indicated opposite such
          Lender's name of Schedule A hereto, and (ii) a warrant in the form
                           ----------
          of Exhibit C-1 hereto (the "April Warrants I"), registered in the
             -----------
          name of such Lender pursuant to which such Lender shall have the
          right to acquire the number of shares of Common Stock indicated
          opposite such Lender's name on Schedule A hereto under the heading
                                         ----------
          "April Warrants I-Warrant Shares". The aggregate principal amount
          of April Notes I issued to the Lenders under the Third Closing
          shall be $20,000,000. The Conversion Price of the April I Notes
          shall be $25.51; provided, however, that if the press release
                           --------  -------
          required under Section 8.4 has not been issued prior to 11am
          Eastern time, the Conversion Price of the April I Notes shall be
          the lesser of (i) $25.51 and (ii) the last bid price at 11:01 am
          as reported on Bloomberg.

     2.2. Zoltek shall deliver to each Lender the remaining closing
          deliveries under Section 2.8 of the September Purchase Agreement
          and each Lender shall deliver to Zoltek, in immediately available
          funds by wire transfer to an account designed by Zoltek, its
          respective purchase price.

     2.3. For the purposes of this Amendment, the term "Nasdaq Approval"
          shall mean the date in which the Company receives approval from
          Nasdaq to issue all of the securities and the underlying shares of
          Common Stock contemplated by this Amendment. Zoltek shall use its
          best efforts to obtain the Nasdaq Approval as promptly as
          possible. To the extent Nasdaq requires Zoltek to obtain the
          consent


                                     3




          of its shareholders, Zoltek hereby agrees that the provisions of
          Section 5(b)(iii) of the April I Notes shall apply and are hereby
          incorporated into this Amendment.

3.   Fourth Closing. -Subject to the terms hereof and Section 7 and
     --------------
     notwithstanding any provision of the September Purchase Agreement to the
     contrary, each Lender and Zoltek agree that the Fourth Closing Date shall
     occur on the Business Day following the Event Date (as defined below).

     3.1. In connection with the Fourth Closing, Zoltek shall issue to each
          Lender (i) a note in the form of Exhibit B-2 hereto (the "April
                                           -----------
          Notes II", and together with the April Notes I, the "April
          Notes"), registered in the name of such Lender in the aggregate
          principal amount of the purchase price indicated opposite such
          Lender's name of Schedule A hereto, and (ii) a warrant in the form
                           ----------
          of Exhibit C-2 hereto (the "April Warrants II", and together with
             -----------
          the April Warrants I, the "April Warrants"), registered in the
          name of such Lender pursuant to which such Lender shall have the
          right to acquire the number of shares of Common Stock indicated
          opposite such Lender's name on Schedule A hereto under the heading
                                         ----------
          "April Warrants II-Warrant Shares". The aggregate principal amount
          of April Notes II issued to the Lenders under the Fourth Closing
          shall be $10,000,000. The Conversion Price of the April II Notes
          shall be $25.51; provided, however, that if the press release
                           --------  -------
          required under Section 8.4 has not been issued prior to 11am
          Eastern time, the Conversion Price of the April II Notes shall be
          the lesser of (i) $25.51 and (ii) the last bid price at 11:01 am
          as reported on Bloomberg.

     3.2. Zoltek shall deliver to each Lender the remaining closing
          deliveries under Section 2.9 of the September Purchase Agreement
          and each Lender shall deliver to Zoltek, in immediately available
          funds by wire transfer to an account designed by Zoltek, its
          respective purchase price.

     3.3. For the purposes of this Section 3, the term "Event Date" shall
          mean the date, following the Nasdaq Approval, Zolek delivers to
          each Lender either (i) a legal opinion of Hungarian counsel to the
          Zoltek and Opco stating that the April Notes II are covered under
          the Mortgage and Security Agreement, all in form and substance
          reasonably satisfactory to the Administrative Agent and such
          Lender; or (ii) an amended Mortgage and Security Agreement
          covering the April Notes II, each properly endorsed and filed as
          required by applicable law to perfect the security interest of the
          Lenders. Notwithstanding anything to the contrary, each Lender
          shall have the right to require a Fourth Closing at any time after
          the expiration of 30 days following receipt of the Nasdaq
          Approval.

4.   Other Amendments.
     ----------------

     4.1. Zoltek and each Lender agree that Section 4.8(b) of the September
          Purchase Agreement shall be deleted and replaced in its entirety
          as follows:

                                     4




          "(b) Prior to the one year anniversary of the Third
Closing Date, in the event the Borrower or any Subsidiary, directly or
indirectly, determines to offer, sell, grant any option to purchase, or
otherwise dispose of (or announces any offer, sale, grant or any option to
purchase or otherwise dispose of) any Common Stock or Common Stock
Equivalents (other than under and pursuant to the Notes and the Warrants) or
any of its Subsidiaries' equity or Common Stock Equivalents, including
without limitation, pursuant to a private placement, an equity line of
credit or a shelf registration statement in accordance with Rule 415 under
the Securities Act, (such offer, sale, grant, disposition or announcement
being referred to as "SUBSEQUENT PLACEMENT"), the Borrower shall deliver to
each Lender a written notice (the "SUBSEQUENT PLACEMENT NOTICE") of its
intention to effect such Subsequent Placement, which specifies in reasonable
detail the type of securities being offered (the "OFFERED SECURITIES"), all
of the other material terms of such Subsequent Placement, the amount of
proceeds intended to be raised thereunder, the names of the investors
(including the investment manager of such investors, if any) and the
investment bankers with whom such Subsequent Placement is proposed to be
effected, and attached to which shall be a term sheet or similar document.
Each Lender shall have until 6:30 p.m. (New York City time) on the fifth
Trading Day after their respective receipt of the Subsequent Placement
Notice to notify Borrower of its intention to participate ("NOTICE OF
ACCEPTANCE"), subject to completion of mutually acceptable documentation, in
such financing on the same terms as set forth in the Subsequent Placement
Notice, provided however, that as to any transaction or series of related
transactions, the Borrower shall have no obligation to offer the Lenders the
right to participate, in the aggregate, in an amount that exceeds the
greater of (i) 25% of the securities offered and (ii) a portion of the
Subsequent Placement equal to the then outstanding principal amount of the
Notes divided by the aggregate purchase price of the Subsequent Placement."

     4.2. Omicron Master Trust ("Omicron") hereby agrees to assign a portion
          of its right to purchase April Notes and April Warrants to
          Rockmore Investment Master Fund, Ltd ("Rockmore"), as set forth on
          Schedule A hereto.
          ----------

     4.3. In the event Zoltek does not obtain Nasdaq Approval within 30 days
          of the date of this Amendment, for a period of ten days
          immediately following such 30 day period the Lenders shall have
          the right upon written notice to Zoltek to terminate this
          Amendment and the Closings.

5.   Registration Rights. To ensure that the registration rights of the
     -------------------
     Lenders are not adversely affected as a result of the transactions
     contemplated by this Amendment and to provide registration rights
     consistent with the existing registration rights in respect of the
     securities issuable upon exercise of the April Notes and April
     Warrants, the parties agree as follows with respect to registration
     rights.

     5.1. In connection with the penalties due under the Registration Rights
          Agreements, (i) the Lenders hereby agree to waive and release
          Zoltek from any payment obligations under Section 2(c) of the
          February Registration Rights Agreement, September Registration
          Rights Agreement and the Prior Registration Rights Agreements that
          accrued prior to the date hereof, (ii) Section 2(c) of the
          February Registration Rights Agreement and the Prior Registration
          Rights Agreements


                                     5




          shall be deleted in its entirety, (iii) Section 2(c) of the
          September Registration Rights Agreement shall remain in full force
          and effect in connection with any penalties arising after the date
          hereof, provided, however, that in the event of a breach of its
                  --------  -------
          obligations Zoltek shall issue to the Lenders an amount of
          unregistered Common Stock equal to 35% of the total number of
          shares of Common Stock into which the aggregate principal amount
          of the 2003 Debentures (as defined in the April Note), the 2004
          Debentures (as defined in the April Note), the 2004 Notes (as
          defined in the April Note), February Notes, September Notes and
          April Notes would be convertible, and (iv) the Lenders hereby
          waive any Event of Default arising under all notes, debentures and
          warrants issued pursuant to the September Purchase Agreement, the
          February Purchase Agreement, the 2003 Securities Purchase
          Agreement, the 2004 Securities Purchase Agreement, the 2004
          Securities Purchase Agreement and the 2004 Loan Agreement to the
          extent and only to the extent such Event of Default arose prior to
          the date hereof. For the purposes of this Section 5.1, the term
          "Prior Registration Rights Agreements" shall mean each of the
          registration rights agreements among Zoltek and the Lenders
          executed in connection with the 2003 Securities Purchase
          Agreement, the 2004 Securities Purchase Agreement, the 2004
          Securities Purchase Agreement and the 2004 Loan Agreement.

     5.2. The parties hereby confirm that the definition of "Registrable
          Securities" under the September Registration Rights Agreement
          includes (a) the shares of Common Stock issuable upon conversion
          of the 2003 Debentures (assuming such 2003 Debentures are held
          until the maturity date thereof and all interest is accreted to
          principal thereunder), (b) the shares of Common Stock issuable
          upon the exercise of the warrants under the 2003 Securities
          Purchase Agreement, (c) payment of interest on the 2003 Debentures
          in Common Stock, (d) the shares of Common Stock issuable upon
          conversion of the 2004 Debentures (assuming such 2004 Debentures
          are held until the maturity date thereof and all interest is
          accreted to principal thereunder), (e) the shares of Common Stock
          issuable upon the exercise of the warrants under the 2004
          Securities Purchase Agreement, (f) payment of interest on the 2004
          Debentures in Common Stock, (g) the shares of Common Stock
          issuable upon conversion of the 2004 Notes (assuming such 2004
          Notes are held until the maturity date thereof and all interest is
          accreted to principal thereunder), (h) the shares of Common Stock
          issuable upon the exercise of the warrants under the 2004 Loan
          Agreement, (i) payment of interest on the 2004 Notes in Common
          Stock, (j) the shares of Common Stock issuable upon conversion of
          the February Notes (assuming such September Notes are held until
          the maturity date thereof and all interest is accreted to
          principal thereunder), (k) the shares of Common Stock issuable
          upon the exercise of the February Warrants, (l) payment of
          interest on the February Notes in Common Stock, (m) the shares of
          Common Stock issuable upon conversion of the September Notes
          (assuming such September Notes are held until the maturity date
          thereof and all interest is accreted to principal thereunder), (n)
          the shares of Common Stock issuable upon the exercise of the
          September Warrants, (o) payment of interest on the September Notes
          in Common Stock, (p) the shares of Common Stock issuable upon
          conversion of each of the April Notes (assuming such April Notes
          are held until


                                     6




          the maturity date thereof and all interest is accreted to principal
          thereunder), (q) the shares of Common Stock issuable upon the
          exercise of each of the April Warrants, (r) payment of interest on
          each of the April Notes in Common Stock, (s) any other Common
          Stock issuable upon conversion or exercise of any securities
          previously issued to the Lenders by Zoltek and (t) any securities
          issued or issuable upon any stock split, dividend or other
          distribution, recapitalization or similar event, or any conversion
          or exercise price adjustment with respect thereto after the date
          hereof.

     5.3. Zoltek will use commercially reasonable efforts to prepare and
          file a registration statement to cover all shares of Common Stock
          issuable under the Transaction Documents, including the
          Registrable Securities.

     5.4. The registration statement contemplated in Section 2(b) of the
          September Registration Rights Agreement will constitute a
          "Registration Statement" under the September Registration Rights
          Agreement, and shall be subject to all the rights and obligations
          of and upon each of Zoltek and the "Lenders" thereunder. With
          respect to the Registration Statement contemplated by Section 2(b)
          of the September Registration Rights Agreement, the Filing Date
          shall be the 20th calendar day following the date hereof. The
          calculation of the Effectiveness Date with respect to the initial
          Registration Statement contemplated by Section 2(b) of the
          September Registration Rights Agreement shall be the earlier of:
          (i) the 90th day following the date hereof; provided, however,
                                                      --------  -------
          that, if the Commission reviews and has written comments to the
          filed Registration Statement that would require the filing of a
          pre-effective amendment thereto with the Commission, then the
          Effectiveness Date under this clause (i) shall be the 120th day
          following the date hereof and (ii) the fifth Trading Day following
          the date on which Zoltek is notified by the Commission that the
          initial Registration Statement will not be reviewed or is no
          longer subject to further review and comments.

     5.5. Notwithstanding anything to he contrary contained in this Section
          5, each of the penalties due to the Lenders under the February
          Registration Rights Agreement, September Registration Rights
          Agreement and the Prior Registration Rights Agreements shall
          remain in full force and effect and continue to accrue until such
          time as Zoltek has obtained Nasdaq Approval.

6.   Continued Validity of Transaction Documents under Purchase Agreements.
     ---------------------------------------------------------------------
     The parties hereto agree that the Purchase Agreements and the
     Transaction Documents entered into in connection therewith (as amended
     by this Amendment), remain in full force and effect, modified to the
     extent and only to the extent necessary to give effect to this
     Amendment and the transactions herein contemplated.

7.   Closing.
     -------

     7.1. Closing. In connection with the Third Closing, on the Trading Day
          -------
          following the date on which the conditions set forth in Section
          2.8 of the September Purchase


                                     7




          Agreement are satisfied and the Nasdaq Approval is received, and in
          connection with the Fourth Closing, on the Trading Day following
          the date following the Event Date on which the conditions set
          forth in Section 2.9 of the September Purchase Agreement are
          satisfied, or on such other date as the parties may agree (each, a
          "Closing Date"), the closing of the transactions contemplated by
          this Amendment shall occur (each, a "Closing").

8.   Miscellaneous.
     -------------

     8.1. Fees and Expenses. Zoltek has agreed to reimburse Rockmore $30,000
          -----------------
          for its legal fees and expenses in connection with this Amendment.
          Accordingly, the amount Rockmore must pay to Zoltek to purchase
          the April I Notes under Section 2 shall be reduced by $30,000.
          Except for the foregoing, each party hereto will bear the fees and
          expenses of its own counsel and advisors in connection with the
          negotiation and entering into of this Amendment. Zoltek shall pay
          all transfer agent fees, stamp taxes and other taxes and duties
          levied in connection with the issuance of any Securities.

     8.2. Entire Agreement. This Amendment and the Transaction Documents,
          ----------------
          together with the exhibits and schedules thereto, contain the
          entire understanding of the parties with respect to the subject
          matter hereof and supersede all prior agreements and
          understandings, oral or written, with respect to such matters,
          which the parties acknowledge have been merged into such
          documents, exhibits and schedules.

     8.3. Equal Treatment of Lenders. No consideration shall be offered or
          --------------------------
          paid to any person to amend or consent to a waiver or modification
          of any provision of any of the Transaction Documents unless the
          same consideration is also offered to all of the parties to the
          Transaction Documents. For clarification purposes, this provision
          constitutes a separate right granted to each Lender by Zoltek and
          negotiated separately by each Lender, and is intended to treat for
          Zoltek and the Lenders as a class and shall not in any way be
          construed as the Lenders acting in concert or as a group with
          respect to the purchase, disposition or voting of Securities or
          otherwise.

     8.4. Public Announcement. Zoltek shall, by11:00 a.m. Eastern time on
          -------------------
          April 28, 2006, issue a press release disclosing the material
          terms of the transactions contemplated hereby and by 4:30 p.m.
          Eastern time on such date, file a Current Report on Form 8-K,
          attaching such press release and the Transaction Documents
          thereto, each reasonably acceptable to each Lender. Zoltek and
          each Lender shall consult with each other in issuing any other
          press releases with respect to the transactions contemplated
          hereby, and neither Zoltek nor any Lender shall issue any such
          press release or otherwise make any such public statement without
          the prior consent of Zoltek, with respect to any press release of
          any Lender, or without the prior consent of each Lender, with
          respect to any press release of Zoltek, which consent shall not
          unreasonably be withheld, except if such


                                     8




           disclosure is required by law, in which case the disclosing
           party shall promptly provide the other party with prior notice of
           such public statement or communication. Notwithstanding the
           foregoing, Zoltek shall not publicly disclose the name of any
           Lender, or include the name of any Lender in any filing with the
           Commission or any regulatory agency or Trading Market, without the
           prior written consent of such Lender, except (i) as required by
           federal securities law in connection with the registration
           statement contemplated by the Registration Rights Agreement and
           (ii) to the extent such disclosure is required by law or Trading
           Market regulations, in which case Zoltek shall provide the Lenders
           with prior notice of such disclosure permitted under subclause (i)
           or (ii).

     8.5.  Notices. Any and all notices or other communications or deliveries
           -------
           required or permitted to be provided hereunder shall be in writing
           and shall be deemed given and effective as specified in the
           September Purchase Agreement. The address for such notices and
           communications shall be as set forth on the signature pages
           attached to the September Purchase Agreement.

     8.6.  Amendments; Waivers. No provision of this Amendment may be waived
           -------------------
           or amended except in a written instrument signed, in the case of
           an amendment, by Zoltek and each Lender or, in the case of a
           waiver, by the party against whom enforcement of any such waiver
           is sought. No waiver of any default with respect to any provision,
           condition or requirement of this Amendment shall be deemed to be a
           continuing waiver in the future or a waiver of any subsequent
           default or a waiver of any other provision, condition or
           requirement hereof, nor shall any delay or omission of either
           party to exercise any right hereunder in any manner impair the
           exercise of any such right.

     8.7.  Amendment Controls. If any topic is addressed both in the Purchase
           ------------------
           Agreements (or any document related thereto) and in this
           Amendment, this Amendment shall control.

     8.8.  Construction. The headings herein are for convenience only, do not
           ------------
           constitute a part of this Amendment and shall not be deemed to
           limit or affect any of the provisions hereof. The language used in
           this Amendment will be deemed to be the language chosen by the
           parties to express their mutual intent, and no rules of strict
           construction will be applied against any party.

     8.9.  Governing Law. All questions concerning the construction,
           -------------
           validity, enforcement and interpretation of this Amendment shall
           be governed by and construed and enforced in accordance with the
           internal laws of the State of New York, without regard to the
           principles of conflicts of law thereof. The parties agree that
           Section 8.8 of the September Purchase Agreement shall apply to
           this Amendment as if set forth in its entirety herein.

     8.10. Survival. The representations and warranties contained herein
           --------
           shall survive the delivery, exercise and/or conversion of the
           Securities, as applicable for the applicable statue of
           limitations.

                                     9




     8.11. Execution. This Amendment may be executed in two or more
           ---------
           counterparts, all of which when taken together shall be considered
           one and the same document and shall become effective when
           counterparts have been signed by each party and delivered to the
           other party, it being understood that both parties need not sign
           the same counterpart.

     8.12. Severability. If any provision of this Amendment is held to be
           ------------
           invalid or unenforceable in any respect, the validity and
           enforceability of the remaining terms and provisions of this
           Amendment shall not in any way be affected or impaired thereby and
           the parties will attempt to agree upon a valid and enforceable
           provision that is a reasonable substitute therefor, and upon so
           agreeing, shall incorporate such substitute provision in this
           Amendment.

     8.13. Independent Nature of Lenders' Obligations and Rights. The
           -----------------------------------------------------
           obligations of each Lender hereunder are several and not joint
           with the obligations of any other Lender, and no Lender shall be
           responsible in any way for the performance of the obligations of
           any other Lender. Nothing contained herein, and no action taken by
           any Lender pursuant hereto, shall be deemed to constitute the
           Lenders as a partnership, an association, a joint venture or any
           other kind of entity, or create a presumption that the Lenders are
           in any way acting in concert or as a group with respect to such
           obligations or the transactions contemplated hereby. Each Lender
           shall be entitled to independently protect and enforce its rights,
           including, without limitation, the rights arising out of this
           Amendment and it shall not be necessary for any other Lender to be
           joined as an additional party in any proceeding for such purpose.
           The Lenders have not relied upon the same legal counsel in their
           review and negotiation of this Amendment. Zoltek has elected to
           provide all Lenders with the same terms and form of Amendment for
           the convenience of Zoltek and not because it was required or
           requested to do so by the Lenders. Each Lender represents that it
           has been represented by its own separate legal counsel in its
           review and negotiations of this Amendment and each party
           represents and confirms that Proskauer Rose LLP represents only
           Omicron in connection with this Amendment.

                          (Signature Pages Follow)


                                     10




         IN WITNESS WHEREOF, the parties hereto have caused this Amendment
to be duly executed by their respective authorized signatories as of the
date first indicated above.

ZOLTEK COMPANIES, INC.

By:   /s/ Kevin Schott
     Name: Kevin Schott
     Title:  Chief Financial Officer

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                   SIGNATURE PAGE FOR PURCHASERS FOLLOWS]



                                     11





         IN WITNESS WHEREOF, the undersigned have caused this Amendment to
be duly executed by their respective authorized signatories as of the date
first indicated above.

Name of Investing Entity: _____________________________________________________
Signature of Authorized Signatory of Investing Entity: ________________________
Name of Authorized Signatory: _________________________________________________
Title of Authorized Signatory: ________________________________________________
Email Address of Authorized Entity:____________________________________________



                                     12






                                                   SCHEDULE A
                                                   ----------


- -----------------------------------------------------------------------------------------------------------------
                        ADDITIONAL     APRIL NOTES I /     APRIL WARRANTS   APRIL NOTES II /    APRIL WARRANTS
                         WARRANTS       PURCHASE PRICE    I-WARRANT SHARES   PURCHASE PRICE   II-WARRANT SHARES
- -----------------------------------------------------------------------------------------------------------------
                                                                                     
    Rockmore
   Investment
Master Fund, Ltd                0         $3,333,333           45,734        $1,666,667              22,867
- -----------------------------------------------------------------------------------------------------------------
 Omicron Master
     Trust                 55,556         $7,333,333          100,615        $3,666,667              50,308
- -----------------------------------------------------------------------------------------------------------------
  Smithfield
 Fiduciary LLC             11,112         $3,333,333           45,734        $1,666,667              22,867
- -----------------------------------------------------------------------------------------------------------------
    Iroquois
  Capital, L.P.             8,334         $2,000,000           27,441        $1,000,000              13,721
- -----------------------------------------------------------------------------------------------------------------
   Cranshire
  Capital, L.P.            16,667         $2,000,000           27,441        $1,000,000              13,721
- -----------------------------------------------------------------------------------------------------------------
   Midsummer
 Investment Ltd.           19,444         $2,000,000           27,441        $1,000,000              13,721
- -----------------------------------------------------------------------------------------------------------------
        Total             111,113        $20,000,000          274,316       $10,000,000             137,205
- -----------------------------------------------------------------------------------------------------------------