Document:

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                                                                 Exhibit 4.4

                                                           Execution Version

                             EXHIBIT C-1 and C-2
                             -------------------

NEITHER THESE SECURITIES NOR THE SECURITIES INTO WHICH THESE SECURITIES ARE
EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION
OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN
AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH
APPLICABLE STATE SECURITIES LAWS AS EVIDENCED BY A LEGAL OPINION OF COUNSEL
TO THE TRANSFEROR TO SUCH EFFECT, THE SUBSTANCE OF WHICH SHALL BE REASONABLY
ACCEPTABLE TO THE COMPANY. THESE SECURITIES AND THE SECURITIES ISSUABLE UPON
EXERCISE OF THESE SECURITIES MAY BE PLEDGED IN A MANNER CONSISTENT WITH THE
SECURITIES ACT IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT SECURED BY SUCH
SECURITIES.

                           ZOLTEK COMPANIES, INC.

                                   WARRANT

Warrant No. [ ]                           Date of Original Issuance: __, 2006

         Zoltek Companies, Inc., a Missouri corporation (the "COMPANY"),
hereby certifies that, for value received, [ ] or its registered assigns
(the "HOLDER"), is entitled to purchase from the Company up to a total of
[ ] shares of common stock, par value $0.01 per share (the "COMMON STOCK"),
of the Company (each such share, a "WARRANT SHARE" and all such shares, the
"WARRANT SHARES") at an exercise price equal to $28.06 per share (as
adjusted from time to time as provided in Section 9, the "EXERCISE PRICE"),
at any time and from time to time from and after the date hereof and through
and including ____, 2011 (the "EXPIRATION DATE")(1), and subject to the
following terms and conditions:

         1. Definitions. In addition to the terms defined elsewhere in this
            -----------
Warrant, capitalized terms that are not otherwise defined herein shall have
the meanings given to such terms in the Loan and Warrant Agreement, dated as
of September 29, 2005, as amended by Amendment No. 1 (the "Amendment") ,
dated as of April 28, 2006, to which the Company and the original Holder are
parties (the "PURCHASE AGREEMENT").

----------------
(1) 5 years from the date of issue

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         2. Registration of Warrant. The Company shall register this
            -----------------------
Warrant, upon records to be maintained by the Company for that purpose (the
"WARRANT REGISTER"), in the name of the record Holder hereof from time to
time. The Company may deem and treat the registered Holder of this Warrant
as the absolute owner hereof for the purpose of any exercise hereof or any
distribution to the Holder, and for all other purposes, absent actual notice
to the contrary.

         3. Registration of Transfers. The Company shall register the
            -------------------------
transfer of any portion of this Warrant in the Warrant Register, upon
surrender of this Warrant, with the Form of Assignment attached hereto duly
completed and signed, to the Company at its address specified herein. Upon
any such registration or transfer, a new Warrant to purchase Common Stock,
in substantially the form of this Warrant (any such new Warrant, a "NEW
WARRANT"), evidencing the portion of this Warrant so transferred shall be
issued to the transferee and a New Warrant evidencing the remaining portion
of this Warrant not so transferred, if any, shall be issued to the
transferring Holder. The acceptance of the New Warrant by the transferee
thereof shall be deemed the acceptance by such transferee of all of the
rights and obligations of a holder of a Warrant.

         4. Exercise and Duration of Warrants.
            ---------------------------------

            (a) This Warrant shall be exercisable by the registered Holder at
any time and from time to time on or after the date hereof to and including
the Expiration Date. At 6:30 p.m., New York City time on the Expiration
Date, the portion of this Warrant not exercised prior thereto shall be and
become void and of no value, provided, that if the closing sales price of
                             --------
the Common Stock on the Expiration Date is greater than 102% of the Exercise
Price on the Expiration Date, then this Warrant shall be deemed to have been
exercised in full (to the extent not previously exercised) on a "cashless
exercise" basis at 6:30 P.M. New York City time on the Expiration Date. The
Company may not call or redeem all or any portion of this Warrant without
the prior written consent of the Holder.

            (b) Notwithstanding anything to the contrary herein, at the option
of the Holder, the Expiration Date may be extended for the number of Trading
Days during any period occurring after the Effectiveness Date in which (i)
trading in the Common Stock is suspended by any Trading Market, (ii) the
Registration Statement is not effective, or (iii) the prospectus included in
the Registration Statement may not be used by the Holders for the resale of
Registrable Securities thereunder.

         5. Delivery of Warrant Shares.
            --------------------------

            (a) To effect exercises hereunder, the Holder shall not be required
to physically surrender this Warrant unless the aggregate Warrant Shares
represented by this Warrant is being exercised. Upon delivery of the
Exercise Notice to the Company (with the attached Warrant Shares Exercise
Log) at its address for notice set forth herein and upon payment of the
Exercise Price multiplied by the number of Warrant Shares that the Holder
intends to purchase hereunder, the Company shall promptly (but in no event
later than three Trading Days after the Date of Exercise (as defined
herein)) issue and deliver to the Holder, a certificate for the Warrant
Shares issuable upon such exercise, which, unless otherwise required by the
Purchase Agreement, shall be free of restrictive legends. The Company shall,
upon request of the Holder and subsequent to the date on which a
registration statement covering the

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resale of the Warrant Shares has been declared effective by the Securities
and Exchange Commission, use its best efforts to deliver Warrant Shares
hereunder electronically through The Depository Trust Corporation or another
established clearing corporation performing similar functions, if available,
provided, that, the Company may, but will not be required to change its
transfer agent if its current transfer agent cannot deliver Warrant Shares
electronically through the Depository Trust Corporation. A "DATE OF
EXERCISE" means the date on which the Holder shall have delivered to
Company: (i) the Exercise Notice (with the Warrant Exercise Log attached to
it), appropriately completed and duly signed and (ii) if such Holder is not
utilizing the cashless exercise provisions set forth in this Warrant,
payment of the Exercise Price for the number of Warrant Shares so indicated
by the Holder to be purchased.

            (b) If by the third Trading Day after a Date of Exercise the
Company fails to deliver the required number of Warrant Shares in the manner
required pursuant to Section 5(a), then the Holder will have the right to
rescind such exercise.

            (c) If by the third Trading Day after a Date of Exercise the
Company fails to deliver the required number of Warrant Shares in the manner
required pursuant to Section 5(a), and if after such third Trading Day and
prior to the receipt of such Warrant Shares, the Holder purchases (in an
open market transaction or otherwise) shares of Common Stock to deliver in
satisfaction of a sale by the Holder of the Warrant Shares which the Holder
anticipated receiving upon such exercise (a "BUY-IN"), then the Company
shall (1) pay in cash to the Holder the amount by which (x) the Holder's
total purchase price (including brokerage commissions, if any) for the
shares of Common Stock so purchased exceeds (y) the amount obtained by
multiplying (A) the number of Warrant Shares that the Company was required
to deliver to the Holder in connection with the exercise at issue by (B) the
closing bid price of the Common Stock at the time of the obligation giving
rise to such purchase obligation and (2) at the option of the Holder, either
reinstate the portion of the Warrant and equivalent number of Warrant Shares
for which such exercise was not honored or deliver to the Holder the number
of shares of Common Stock that would have been issued had the Company timely
complied with its exercise and delivery obligations hereunder. The Holder
shall provide the Company written notice indicating the amounts payable to
the Holder in respect of the Buy-In.

            (d) The Company's obligations to issue and deliver Warrant Shares
in accordance with the terms hereof are absolute and unconditional,
irrespective of any action or inaction by the Holder to enforce the same,
any waiver or consent with respect to any provision hereof, the recovery of
any judgment against any Person or any action to enforce the same, or any
setoff, counterclaim, recoupment, limitation or termination, or any breach
or alleged breach by the Holder or any other Person of any obligation to the
Company or any violation or alleged violation of law by the Holder or any
other Person, and irrespective of any other circumstance which might
otherwise limit such obligation of the Company to the Holder in connection
with the issuance of Warrant Shares. Nothing herein shall limit a Holder's
right to pursue any other remedies available to it hereunder, at law or in
equity including, without limitation, a decree of specific performance
and/or injunctive relief with respect to the Company's failure to timely
deliver certificates representing shares of Common Stock upon exercise of
the Warrant as required pursuant to the terms hereof.

         6. Charges, Taxes and Expenses. Issuance and delivery of
            ---------------------------
certificates for shares of Common Stock upon exercise of this Warrant shall
be made without charge to the Holder for any

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issue or transfer tax, withholding tax, transfer agent fee or other
incidental tax or expense in respect of the issuance of such certificates,
all of which taxes and expenses shall be paid by the Company; provided,
however, that the Company shall not be required to pay any tax which may be
payable in respect of any transfer involved in the registration of any
certificates for Warrant Shares or Warrants in a name other than that of the
Holder. The Holder shall be responsible for all other tax liability that may
arise as a result of holding or transferring this Warrant or receiving
Warrant Shares upon exercise hereof.

         7. Replacement of Warrant. If this Warrant is mutilated, lost,
            ----------------------
stolen or destroyed, the Company shall issue or cause to be issued in
exchange and substitution for and upon cancellation hereof, or in lieu of
and substitution for this Warrant, a New Warrant, but only upon receipt of
evidence reasonably satisfactory to the Company of such loss, theft or
destruction and customary and reasonable indemnity (which may include a
surety bond for any Holder other than the original Holder of the Warrant),
if requested. Applicants for a New Warrant under such circumstances shall
also comply with such other reasonable regulations and procedures and pay
such other reasonable third-party costs as the Company may prescribe. If a
New Warrant is requested as a result of a mutilation of this Warrant, then
the Holder shall deliver such mutilated Warrant to the Company as a
condition precedent to the Company's obligation to issue the New Warrant.

         8. Reservation of Warrant Shares. The Company covenants that it
            -----------------------------
will at all times reserve and keep available out of the aggregate of its
authorized but unissued and otherwise unreserved Common Stock, solely for
the purpose of enabling it to issue Warrant Shares upon exercise of this
Warrant as herein provided, the number of Warrant Shares which are then
issuable and deliverable upon the exercise of this entire Warrant, free from
preemptive rights or any other contingent purchase rights of persons other
than the Holder (taking into account the adjustments and restrictions of
Section 9). The Company covenants that all Warrant Shares so issuable and
---------
deliverable shall, upon issuance and the payment of the applicable Exercise
Price in accordance with the terms hereof, be duly and validly authorized,
issued and fully paid and nonassessable.

         9. Certain Adjustments. The Exercise Price and number of Warrant
            --------------------
Shares issuable upon exercise of this Warrant are subject to adjustment from
time to time as set forth in this Section 9.
                                  ---------

            (a) Stock Dividends and Splits. If the Company, at any time while
                --------------------------
this Warrant is outstanding, (i) pays a stock dividend on its Common Stock
or otherwise makes a distribution on any class of capital stock that is
payable in shares of Common Stock, (ii) subdivides outstanding shares of
Common Stock into a larger number of shares, or (iii) combines outstanding
shares of Common Stock into a smaller number of shares, then in each such
case the Exercise Price shall be multiplied by a fraction of which the
numerator shall be the number of shares of Common Stock outstanding
immediately before such event and of which the denominator shall be the
number of shares of Common Stock outstanding immediately after such event.
Any adjustment made pursuant to clause (i) of this paragraph shall become
effective immediately after the record date for the determination of
shareholders entitled to receive such dividend or distribution, and any
adjustment pursuant to clause (ii) or (iii) of this paragraph shall become
effective immediately after the effective date of such subdivision or
combination. If any event requiring an adjustment under this paragraph
occurs during the period that an Exercise

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Price is calculated hereunder, then the calculation of such Exercise Price
shall be adjusted appropriately to reflect such event.

            (b) Pro Rata Distributions. If the Company, at any time while this
                ----------------------
Warrant is outstanding, distributes to all holders of Common Stock (i)
evidences of its indebtedness, (ii) any security (other than a distribution
of Common Stock covered by the preceding paragraph), (iii) rights or
warrants to subscribe for or purchase any security, or (iv) any other asset
(in each case, "DISTRIBUTED PROPERTY"), then, at the request of any Holder
delivered before the 90th day after the record date fixed for determination
of shareholders entitled to receive such distribution, the Company will
deliver to such Holder, within five Trading Days after such request (or, if
later, on the effective date of such distribution), the Distributed Property
that such Holder would have been entitled to receive in respect of the
Warrant Shares for which such Holder's Warrant could have been exercised
immediately prior to such record date. If such Distributed Property is not
delivered to a Holder pursuant to the preceding sentence, then upon any
exercise of the Warrant that occurs after such record date, such Holder
shall be entitled to receive, in addition to the Warrant Shares otherwise
issuable upon such conversion, the Distributed Property that such Holder
would have been entitled to receive in respect of such number of Warrant
Shares had the Holder been the record holder of such Warrant Shares
immediately prior to such record date. Notwithstanding the foregoing, this
Section 9(b) shall not apply to any distribution of rights or securities in
respect of adoption by the Company of a shareholder rights plan which events
shall be covered by the anti-dilution provisions of Section 9(a).

            (c) Fundamental Transactions. If, at any time while this Warrant is
                ------------------------
outstanding, (1) the Company effects any merger or consolidation of the
Company with or into another Person, (2) the Company effects any sale of all
or substantially all of its assets in one or a series of related
transactions, (3) any tender offer or exchange offer approved or authorized
by the Board of Directors of the Company (whether by the Company or another
Person) is completed pursuant to which holders of Common Stock are permitted
to tender or exchange their shares for other securities, cash or property,
or (4) the Company effects any reclassification of the Common Stock or any
compulsory share exchange pursuant to which the Common Stock is effectively
converted into or exchanged for other securities, cash or property (in any
such case, a "FUNDAMENTAL TRANSACTION"), then the Holder shall have the
right thereafter to receive, upon exercise of this Warrant, the same amount
and kind of securities, cash or property as it would have been entitled to
receive upon the occurrence of such Fundamental Transaction if it had been,
immediately prior to such Fundamental Transaction, the holder of the number
of Warrant Shares then issuable upon exercise in full of this Warrant (the
"ALTERNATE CONSIDERATION"). For purposes of any such exercise, the
determination of the Exercise Price shall be appropriately adjusted to apply
to such Alternate Consideration based on the amount of Alternate
Consideration issuable in respect of one share of Common Stock in such
Fundamental Transaction, and the Company shall apportion the Exercise Price
among the Alternate Consideration in a reasonable manner reflecting the
relative value of any different components of the Alternate Consideration.
If holders of Common Stock are given any choice as to the securities, cash
or property to be received in a Fundamental Transaction, then the Holder
shall be given the same choice as to the Alternate Consideration it receives
upon any exercise of this Warrant following such Fundamental Transaction. At
the Holder's option and request, any successor to the Company or surviving
entity in such Fundamental Transaction shall, either (1) issue to the Holder
a new warrant substantially in the form of this Warrant and consistent with
the foregoing provisions and evidencing the Holder's right to purchase the
Alternate

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Consideration for the aggregate Exercise Price upon exercise thereof, or (2)
purchase the Warrant from the Holder for a purchase price, payable in cash
within five Trading Days after such request (or, if later, on the effective
date of the Fundamental Transaction), equal to the Black Scholes value of
the remaining unexercised portion of this Warrant on the date of such
request as well as assumptions reasonably mutually acceptable to the Company
and the Holder, provided, that for purposes of such calculation, the market
                --------
price of the Common Stock shall be the closing bid price of the Common Stock
on the Trading Day immediately preceding the public announcement of the
Fundamental Transaction and the volatility factor shall be determined by
reference to the 12 month average industry volatility measures. The terms of
any agreement pursuant to which a Fundamental Transaction is effected shall
include terms requiring any such successor or surviving entity to comply
with the provisions of this paragraph (c) and insuring that the Warrant (or
any such replacement security) will be similarly adjusted upon any
subsequent transaction analogous to a Fundamental Transaction.

            (d) Subsequent Equity Sales.
                -----------------------

                (i)   While any portion of this Warrant is outstanding, if the
Company issues any shares of Common Stock or the Company or any subsidiary
thereof issues any rights, warrants, options or other securities or debt
that is convertible into, exchangeable for (any such securities, "COMMON
STOCK EQUIVALENTS") entitling any Person to acquire shares of Common Stock,
at a price per share less than the Exercise Price (if the holder of the
Common Stock or Common Stock Equivalent so issued shall at any time, whether
by operation of purchase price adjustments, reset provisions, floating
conversion, exercise or exchange prices or otherwise, or due to warrants,
options or rights issued in connection with such issuance, be entitled to
receive shares of Common Stock at a price less than the Exercise Price, such
issuance shall be deemed to have occurred for less than the Exercise Price),
then the Exercise Price shall be adjusted to equal the conversion, exchange
or purchase price for such Common Stock or Common Stock Equivalents
(including any reset provisions thereof) at issue and which adjusted
Exercise Price shall continue for as long as this Warrants remain
outstanding. Such adjustment shall be made whenever such Common Stock or
Common Stock Equivalents are issued. The Company shall notify the Holder in
writing, no later than the Trading Day following the issuance of any Common
Stock or Common Stock Equivalent subject to this section, indicating therein
the applicable issuance price, or of applicable reset price, exchange price,
conversion price and other pricing terms.

                (ii)  For purposes of this subsection 9(d), the following
subsections (d)(ii)(l) to (d)(ii)(6) shall also be applicable:

                      (1) Issuance of Rights or Options. In case at any time
                          -----------------------------
the Company shall in any manner grant (directly and not by assumption in a
merger or otherwise) any warrants or other rights to subscribe for or to
purchase, or any options for the purchase of, Common Stock or any stock or
security convertible into or exchangeable for Common Stock (such warrants,
rights or options being called "OPTIONS" and such convertible or
exchangeable stock or securities being called "CONVERTIBLE SECURITIES")
whether or not such Options or the right to convert or exchange any such
Convertible Securities are immediately exercisable, and the price per share
for which Common Stock is issuable upon the exercise of such Options or upon
the conversion or exchange of such Convertible Securities (determined by
dividing (i) the

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sum (which sum shall constitute the applicable consideration) of (x) the
total amount, if any, received or receivable by the Company as consideration
for the granting of such Options, plus (y) the aggregate amount of
additional consideration payable to the Company upon the exercise of all
such Options, plus (z), in the case of such Options which relate to
Convertible Securities, the aggregate amount of additional consideration, if
any, payable upon the issue or sale of such Convertible Securities and upon
the conversion or exchange thereof, by (ii) the total maximum number of
shares of Common Stock issuable upon the exercise of such Options or upon
the conversion or exchange of all such Convertible Securities issuable upon
the exercise of such Options) shall be less than the Exercise Price in
effect immediately prior to the time of the granting of such Options, then
the total number of shares of Common Stock issuable upon the exercise of
such Options or upon conversion or exchange of the total amount of such
Convertible Securities issuable upon the exercise of such Options shall be
deemed to have been issued for such price per share as of the date of
granting of such Options or the issuance of such Convertible Securities and
thereafter shall be deemed to be outstanding for purposes of adjusting the
Exercise Price. Except as otherwise provided in subsection 9(d)(ii)(3), no
adjustment of the Exercise Price shall be made upon the actual issue of such
Common Stock or of such Convertible Securities upon exercise of such Options
or upon the actual issue of such Common Stock upon conversion or exchange of
such Convertible Securities.

                      (2) Issuance of Convertible Securities. In case the
                          ----------------------------------
Company shall in any manner issue (directly and not by assumption in a
merger or otherwise) or sell any Convertible Securities, whether or not the
rights to exchange or convert any such Convertible Securities are
immediately exercisable, and the price per share for which Common Stock is
issuable upon such conversion or exchange (determined by dividing (i) the
sum (which sum shall constitute the applicable consideration) of (x) the
total amount received or receivable by the Company as consideration for the
issue or sale of such Convertible Securities, plus (y) the aggregate amount
of additional consideration, if any, payable to the Company upon the
conversion or exchange thereof, by (ii) the total number of shares of Common
Stock issuable upon the conversion or exchange of all such Convertible
Securities) shall be less than the Exercise Price in effect immediately
prior to the time of such issue or sale, then the total maximum number of
shares of Common Stock issuable upon conversion or exchange of all such
Convertible Securities shall be deemed to have been issued for such price
per share as of the date of the issue or sale of such Convertible Securities
and thereafter shall be deemed to be outstanding for purposes of adjusting
the Exercise Price, provided that (a) except as otherwise provided in
subsection 9(d)(ii)(3), no adjustment of the Exercise Price shall be made
upon the actual issuance of such Common Stock upon conversion or exchange of
such Convertible Securities and (b) no further adjustment of the Exercise
Price shall be made by reason of the issue or sale of Convertible Securities
upon exercise of any Options to purchase any such Convertible Securities for
which adjustments of the Exercise Price have been made pursuant to the other
provisions of subsection 9(d).

                      (3) Change in Option Price or Conversion Rate. Upon the
                          -----------------------------------------
happening of any of the following events, namely, if the purchase price
provided for in any Option referred to in subsection 9(d)(ii)(l) hereof, the
additional consideration, if any, payable upon the conversion or exchange of
any Convertible Securities referred to in subsections 9(d)(ii)(l) or
9(d)(ii)(2), or the rate at which Convertible Securities referred to in
subsections 9(d)(ii)(l) or 9(d)(ii)(2) are convertible into or exchangeable
for Common Stock shall change at

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any time (including, but not limited to, changes under or by reason of
provisions designed to protect against dilution), the Exercise Price in
effect at the time of such event shall forthwith be readjusted to the
Exercise Price which would have been in effect at such time had such Options
or Convertible Securities still outstanding provided for such changed
purchase price, additional consideration or conversion rate, as the case may
be, at the time initially granted, issued or sold. On the termination of any
Option for which any adjustment was made pursuant to this subsection 9(d) or
any right to convert or exchange Convertible Securities for which any
adjustment was made pursuant to this subsection 9(d) (including without
limitation upon the redemption or purchase for consideration of such
Convertible Securities by the Company), the Exercise Price then in effect
hereunder shall forthwith be changed to the Exercise Price which would have
been in effect at the time of such termination had such Option or
Convertible Securities, to the extent outstanding immediately prior to such
termination, never been issued.

                      (4) Stock Dividends. Subject to the provisions of this
                          ---------------
Section 9(d), in case the Company shall declare a dividend or make any other
distribution upon any stock of the Company (other than the Common Stock)
payable in Common Stock, Options or Convertible Securities, then any Common
Stock, Options or Convertible Securities, as the case may be, issuable in
payment of such dividend or distribution shall be deemed to have been issued
or sold without consideration.

                      (5) Consideration for Stock. In case any shares of
                          -----------------------
Common Stock, Options or Convertible Securities shall be issued or sold for
cash, the consideration received therefor shall be deemed to be the net
amount received by the Company therefor, after deduction therefrom of any
expenses incurred or any underwriting commissions or concessions paid or
allowed by the Company in connection therewith. In case any shares of Common
Stock, Options or Convertible Securities shall be issued or sold for a
consideration other than cash, the amount of the consideration other than
cash received by the Company shall be deemed to be the fair value of such
consideration as determined in good faith by the Board of Directors of the
Company, after deduction of any expenses incurred or any underwriting
commissions or concessions paid or allowed by the Company in connection
therewith. In case any Options shall be issued in connection with the issue
and sale of other securities of the Company, together comprising one
integral transaction in which no specific consideration is allocated to such
Options by the parties thereto, such Options shall be deemed to have been
issued for such consideration as determined in good faith by the Board of
Directors of the Company. If Common Stock, Options or Convertible Securities
shall be issued or sold by the Company and, in connection therewith, other
Options or Convertible Securities (the "ADDITIONAL RIGHTS") are issued, then
the consideration received or deemed to be received by the Company shall be
reduced by the fair market value of the Additional Rights (as determined
using the Black-Scholes option pricing model or another method mutually
agreed to by the Company and the Holder). The Board of Directors of the
Company shall respond promptly, in writing, to an inquiry by the Holders as
to the fair market value of the Additional Rights. In the event that the
Board of Directors of the Company and the Holders are unable to agree upon
the fair market value of the Additional Rights, the Company and the Holders
shall jointly select an appraiser, who is experienced in such matters. The
decision of such appraiser shall be final and conclusive, and the cost of
such appraiser shall be borne evenly by the Company and the Holder.

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                      (6) Record Date. In case the Company shall take a record
                          -----------
of the holders of its Common Stock for the purpose of entitling them (i) to
receive a dividend or other distribution payable in Common Stock, Options or
Convertible Securities or (ii) to subscribe for or purchase Common Stock,
Options or Convertible Securities, then such record date shall be deemed to
be the date of the issue or sale of the shares of Common Stock deemed to
have been issued or sold upon the declaration of such dividend or the making
of such other distribution or the date of the granting of such right of
subscription or purchase, as the case may be.

                (iii) Notwithstanding the foregoing, no adjustment will
be made under this Section 9(d) as a result of: (i) the issuance of
securities upon the exercise or conversion of any Common Stock Equivalents
issued by the Company prior to the date of this Agreement (but will apply to
any amendments, modifications and reissuances thereof), (ii) the grant of
options or warrants, or the issuance of additional securities, under any
duly authorized company stock option, stock incentive plan, restricted stock
plan or stock purchase plan in existence on the First Closing Date, (iii)
the issuance of Common Stock in payment of interest on the 2005 Notes, 2004
Notes, the 2003 Debentures, the 2004 Debentures or the Notes, (iv) the
issuance of Common Stock Equivalents pursuant to a Strategic Transaction, or
(v) the issuance of Common Stock pursuant to the provisions of Section 2(c)
of the Registration Rights Agreement.

            (e) Number of Warrant Shares. Simultaneously with any adjustment
                ------------------------
to the Exercise Price pursuant to paragraph (a) of this Section, the number
of Warrant Shares that may be purchased upon exercise of this Warrant shall
be increased or decreased proportionately, so that after such adjustment the
aggregate Exercise Price payable hereunder for the adjusted number of
Warrant Shares shall be the same as the aggregate Exercise Price in effect
immediately prior to such adjustment.

            (f) Calculations. All calculations under this Section 9 shall be
                ------------                              ---------
made to the nearest cent or the nearest 1/100th of a share, as applicable.
The number of shares of Common Stock outstanding at any given time shall not
include shares owned or held by or for the account of the Company, and the
disposition of any such shares shall be considered an issue or sale of
Common Stock.

            (g) Notice of Adjustments. Upon the occurrence of each
                ---------------------
adjustment pursuant to this Section 9, the Company at its expense will
                            ---------
promptly compute such adjustment in accordance with the terms of this
Warrant and prepare a certificate setting forth such adjustment, including a
statement of the adjusted Exercise Price and adjusted number or type of
Warrant Shares or other securities issuable upon exercise of this Warrant
(as applicable), describing the transactions giving rise to such adjustments
and showing in detail the facts upon which such adjustment is based. Upon
written request, the Company will promptly deliver a copy of each such
certificate to the Holder and to the Company's transfer agent.

            (h) Notice of Corporate Events. If the Company (i) declares a
                --------------------------
dividend or any other distribution of cash, securities or other property in
respect of its Common Stock, including without limitation any granting of
rights or warrants to subscribe for or purchase any capital stock of the
Company or any Subsidiary, (ii) authorizes or approves, enters into any
agreement contemplating or solicits shareholder approval for any Fundamental
Transaction or (iii) authorizes the voluntary dissolution, liquidation or
winding up of the affairs of the Company,

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then the Company shall deliver to the Holder a notice describing the
material terms and conditions of such transaction, at least 20 calendar days
prior to the applicable record or effective date on which a Person would
need to hold Common Stock in order to participate in or vote with respect to
such transaction, and the Company will take all steps reasonably necessary
in order to insure that the Holder is given the practical opportunity to
exercise this Warrant prior to such time so as to participate in or vote
with respect to such transaction; provided, however, that the failure to
deliver such notice or any defect therein shall not affect the validity of
the corporate action required to be described in such notice.

         10. Payment of Exercise Price. The Holder may pay the Exercise Price
             -------------------------
in one of the following manners:

             (a) Cash Exercise. The Holder may deliver immediately available
                 -------------
funds; or

             (b) Cashless Exercise. The Holder may notify the Company in an
                 -----------------
Exercise Notice of its election to utilize cashless exercise, in which event
the Company shall issue to the Holder the number of Warrant Shares
determined as follows:

                    X = Y [(A-B)/A]

                 where:

                    X = the number of Warrant Shares to be issued to the Holder.

                    Y = the number of Warrant Shares with respect to which
                    this Warrant is being exercised.

                    A = the average of the closing prices for the five
                    Trading Days immediately prior to (but not including) the
                    Exercise Date.

                    B = the Exercise Price.

For purposes of Rule 144 promulgated under the Securities Act, it is
intended, understood and acknowledged that the Warrant Shares issued in a
cashless exercise transaction shall be deemed to have been acquired by the
Holder, and the holding period for the Warrant Shares shall be deemed to
have commenced, on the date this Warrant was originally issued.

         11. Limitations on Exercise.
             -----------------------

                 (i)   Notwithstanding anything to the contrary contained
herein, the number of shares of Common Stock that may be acquired by a
Holder upon any exercise of Warrants (or otherwise in respect hereof) shall
be limited to the extent necessary to insure that, following such exercise
(or other issuance), the total number of shares of Common Stock then
beneficially owned by such Holder and its Affiliates and any other Persons
whose beneficial ownership of Common Stock would be aggregated with such
Holder's for purposes of Section 13(d) of

                                     10

<PAGE>
<PAGE>

the Exchange Act, does not exceed 4.999% (the "THRESHOLD PERCENTAGE") or
9.999% (the "MAXIMUM PERCENTAGE") of the total number of issued and
outstanding shares of Common Stock (including for such purpose the shares of
Common Stock issuable upon such conversion). For such purposes, beneficial
ownership shall be determined in accordance with Section 13(d) of the
Exchange Act and the rules and regulations promulgated thereunder. Each
delivery of an Exercise Notice hereunder will constitute a representation by
the Holder that it has evaluated the limitation set forth in this paragraph
and determined that issuance of the full number of Warrant Shares requested
in such Exercise Notice is permitted under this paragraph. The Company's
obligation to issue shares of Common Stock in excess of the limitation
referred to in this Section shall be suspended (and shall not terminate or
expire notwithstanding any contrary provisions hereof) until such time, if
any, as such shares of Common Stock may be issued in compliance with such
limitation, but in no event later than the Expiration Date. By written
notice to the Company, the Holder may waive the provisions of this Section
or increase or decrease the Maximum Percentage to any other percentage
specified in such notice, but (i) any such waiver or increase will not be
effective until the 61st day after such notice is delivered to the Company,
and (ii) any such waiver or increase or decrease will apply only to the
Holder and not to any other holder of Warrants.

                 (ii)  Notwithstanding anything to the contrary in this
Warrant, if the Company has not previously obtained Shareholder Approval (as
defined below), then the Company may not issue shares of Common Stock in
excess of the (a) the Issuable Maximum or (b) a number of shares above which
the issuance of one additional share would cause a Change of Control (a
"CHANGE OF CONTROL THRESHOLD") upon exercise of this Warrant at an exercise
price which is less than the Closing Price on the Trading Day immediately
preceding the Original Issue Date (the "THRESHOLD PRICE"). The "Issuable
Maximum" means, as of any date, a number of shares of Common Stock equal to
19.99% of the outstanding shares of Common Stock immediately preceding the
First Closing Date, less such number of shares of Common Stock as have been
issued at a price below the Threshold Price (1) upon exercise of the
Warrants and warrants issued under the 2003 Securities Purchase Agreement,
the 2004 Securities Purchase Agreement, 2004 Loan Agreement or the 2005 Loan
Agreement, (2) upon conversion of the 2003 Debentures, the 2004 Debentures,
the 2004 Notes, and the 2005 Notes and (3) upon conversion of the Notes, or
in payment of interest thereunder. Each Holder shall be entitled to a
portion of the Issuable Maximum or Change of Control Threshold, as
applicable, equal to the quotient obtained by dividing: (x) the principal
amount of Notes issued and sold to such Holder on the Original Issue Date by
(y) the aggregate principal amount of all Notes issued and sold by the
Company on the Original Issue Date. If any Holder shall no longer hold
Notes, then such Holder's remaining portion of the Issuable Maximum or
Change of Control Threshold, as applicable, (other than those represented by
the remaining portion of this Warrant and the other warrants referenced in
clause (1) above) shall be allocated pro-rata among the remaining Holders,
giving effect to the Company's desire to allocate among the class of
securities known as the Notes this limitation. If on any Date of Exercise,
or at such time as a Holder shall notify the Company that the condition in
(A) following this clause shall be in effect: (A) the aggregate number of
shares of Common Stock that would then be issuable upon exercise in full of
this Warrant would exceed the Issuable Maximum or would exceed the Change of
Control Threshold on such date, and (B) the Company shall not have
previously obtained the vote of shareholders applicable to approve the
issuance of shares of Common Stock in excess of the Issuable Maximum or
Change of Control Threshold, as applicable, pursuant to the terms hereof
(the "SHAREHOLDER APPROVAL"), then, the Company shall, on such Date of
Exercise or on any Date of Exercise prior to the receipt by the Company of
the Shareholder Approval, shall issue upon exercise hereof a number of
shares of Common Stock equal to the Issuable Maximum or Change of Control
Threshold, as applicable, and, with respect to the remainder of this Warrant
for which

                                     11

<PAGE>
<PAGE>

an exercise would result in an issuance of shares of Common Stock in excess
of the Issuable Maximum or Change of Control Threshold, the Company must
seek Shareholder Approval in accordance with subsection (iii) below. The
Company and the Holder understand and agree that shares of Common Stock
issued to and then held by the Holder as a result of exercises of this
Warrant shall not be entitled to cast votes on any resolution to obtain
Shareholder Approval pursuant hereto.

                 (iii) Shareholder Approval.
                       --------------------

                       (1) If required under applicable Nasdaq regulations,
the Company shall use its best efforts to obtain as soon as possible but in
no event later than 90 days following the date of the Loan Agreement or 120
days in the event the proxy materials shall be reviewed by the Commission,
shareholder approval of the issuance of the Underlying Shares (the
"SHAREHOLDER PROPOSAL"), which approval shall meet the requirements of
Nasdaq's Rule 4350(i) of Nasdaq set forth in the NASD Manual (the
"SHAREHOLDER APPROVAL DATE").

                       (2) As soon as practicable following the date of the
Loan Agreement, but in no event more than 30 days following the date of the
Loan Agreement, the Company shall prepare and file with the Commission proxy
materials calling a special meeting (the "SPECIAL Meeting") of its
shareholders seeking approval of the Shareholder Proposal. The Company shall
use its reasonable best efforts to cause such proxy materials to reach the
"no further comment" stage as soon as possible (the "CLEARANCE DATE") and to
hold the Special Meeting as soon as possible following the Clearance Date,
but in no event later than 45 days following the Clearance Date.

                       (3) The Board of Directors shall recommend approval
thereof by the Company's shareholders. The Company shall mail and distribute
its proxy materials for the Special Meeting to its shareholders at least 30
days prior to the date of the Special Meeting and shall actively solicit
proxies to vote for the Shareholder Proposal. The Company shall provide the
Holders an opportunity to review and comment on such proxy materials by
providing (which may be by e-mail) copies of such proxy materials and any
revised preliminary proxy materials to the Holders at least three (3) days
prior to their filing with the Commission. The Company shall provide the
Holders (which may be by e-mail) copies of all correspondence from or to the
Commission or its staff concerning the proxy materials for the Special
Meeting promptly after the same is sent or received by the Company and
summaries of any comments of the Commission's staff which the Company
receives orally promptly after receiving such oral comments. The Company
shall (i) furnish to the Holders and their counsel (which may be by e-mail)
a copy of its definitive proxy materials for the Special Meeting and any
amendments or supplements thereto promptly after the same are first used,
mailed to shareholders or filed with the Commission, (ii) inform the Holders
of the progress of solicitation of proxies for such meeting and (iii) inform
the Holders of any adjournment of the Special Meeting and shall report the
result of the vote of shareholders on the Shareholder Proposal at the
conclusion of the Special Meeting.

                       (4) If for any reason the Shareholder Proposal is not
approved at the Special Meeting, the Company will take such additional acts
or actions as are necessary to hold an additional Special Meeting to
consider the Shareholder Proposal and in conjunction

                                     12

<PAGE>
<PAGE>

therewith shall hire a nationally recognized proxy solicitation firm,
selected by the Holders which is reasonably satisfactory to the Company, to
assist it in obtaining the necessary shareholder votes to approve the
Shareholder Proposal. The Company shall bear all costs and expenses of the
preparation and filing of any and all proxy materials and Special Meetings,
including but not limited to the costs and expenses of the proxy
solicitation firm if needed.

         12. No Fractional Shares. No fractional shares of Warrant Shares will
             --------------------
be issued in connection with any exercise of this Warrant. In lieu of any
fractional shares which would, otherwise be issuable, the Company shall pay
cash equal to the product of such fraction multiplied by the closing price
of one Warrant Share as reported by the applicable Trading Market on the
date of exercise.

         13. Notices. Any and all notices or other communications or
             -------
deliveries hereunder (including, without limitation, any Exercise Notice)
shall be in writing and shall be deemed given and effective on the earliest
of (i) the date of transmission, if such notice or communication is
delivered via facsimile at the facsimile number specified in this Section
prior to 6:30 p.m. (New York City time) on a Trading Day, (ii) the next
Trading Day after the date of transmission, if such notice or communication
is delivered via facsimile at the facsimile number specified in this Section
on a day that is not a Trading Day or later than 6:30 p.m. (New York City
time) on any Trading Day, (iii) the Trading Day following the date of
mailing, if sent by nationally recognized overnight courier service, or (iv)
upon actual receipt by the party to whom such notice is required to be
given. The addresses for such communications shall be: (i) if to the
Company, to Zoltek Companies, Inc., 3101 McKelvey Road, St. Louis, Missouri
63044, Attn: Chief Financial Officer, Facsimile No.: (314) 291-9082, or (ii)
if to the Holder, to the address or facsimile number appearing on the
Warrant Register or such other address or facsimile number as the Holder may
provide to the Company in accordance with this Section.

         14. Warrant Agent. The Company shall serve as warrant agent under
             -------------
this Warrant. Upon 30 days' notice to the Holder, the Company may appoint a
new warrant agent. Any corporation into which the Company or any new warrant
agent may be merged or any corporation resulting from any consolidation to
which the Company or any new warrant agent shall be a party or any
corporation to which the Company or any new warrant agent transfers
substantially all of its corporate trust or shareholders services business
shall be a successor warrant agent under this Warrant without any further
act. Any such successor warrant agent shall promptly cause notice of its
succession as warrant agent to be mailed (by first class mail, postage
prepaid) to the Holder at the Holder's last address as shown on the Warrant
Register.

         15. Miscellaneous.
             -------------

             (a) This Warrant shall be binding on and inure to the benefit of
the parties hereto and their respective successors and assigns. Subject to
the preceding sentence, nothing in this Warrant shall be construed to give
to any Person other than the Company and the Holder any legal or equitable
right, remedy or cause of action under this Warrant. This Warrant may be
amended only in writing signed by the Company and the Holder and their
successors and assigns.

             (b) All questions concerning the construction, validity,
enforcement and interpretation of this Warrant shall be governed by and
construed and enforced in accordance

                                     13

<PAGE>
<PAGE>

with the internal laws of the State of New York, without regard to the
principles of conflicts of law thereof. Each party agrees that all legal
proceedings concerning the interpretations, enforcement and defense of this
Warrant and the transactions herein contemplated ("PROCEEDINGS") (whether
brought against a party hereto or its respective Affiliates, employees or
agents) shall be commenced exclusively in the state and federal courts
sitting in the City of New York, Borough of Manhattan (the "NEW YORK
COURTS"). Each party hereto hereby irrevocably submits to the exclusive
jurisdiction of the New York Courts for the adjudication of any dispute
hereunder or in connection herewith or with any transaction contemplated
hereby or discussed herein, and hereby irrevocably waives, and agrees not to
assert in any Proceeding, any claim that it is not personally subject to the
jurisdiction of any New York Court, or that such Proceeding has been
commenced in an improper or inconvenient forum. Each party hereto hereby
irrevocably waives personal service of process and consents to process being
served in any such Proceeding by mailing a copy thereof via registered or
certified mail or overnight delivery (with evidence of delivery) to such
party at the address in effect for notices to it under this Warrant and
agrees that such service shall constitute good and sufficient service of
process and notice thereof. Nothing contained herein shall be deemed to
limit in any way any right to serve process in any manner permitted by law.
Each party hereto hereby irrevocably waives, to the fullest extent permitted
by applicable law, any and all right to trial by jury in any legal
proceeding arising out of or relating to this Warrant or the transactions
contemplated hereby. If either party shall commence a Proceeding to enforce
any provisions of this Warrant, then the prevailing party in such Proceeding
shall be reimbursed by the other party for its attorney's fees and other
costs and expenses incurred with the investigation, preparation and
prosecution of such Proceeding.

             (c) The headings herein are for convenience only, do not
constitute a part of this Warrant and shall not be deemed to limit or affect
any of the provisions hereof.

             (d) In case any one or more of the provisions of this Warrant
shall be invalid or unenforceable in any respect, the validity and
enforceability of the remaining terms and provisions of this Warrant shall
not in any way be affected or impaired thereby and the parties will attempt
in good faith to agree upon a valid and enforceable provision which shall be
a commercially reasonable substitute therefor, and upon so agreeing, shall
incorporate such substitute provision in this Warrant.

                [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK,
                           SIGNATURE PAGE FOLLOWS]

                                     14

<PAGE>
<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed by its authorized officer as of the date first indicated above.

                                   ZOLTEK COMPANIES, INC.

                                    By:
                                       --------------------------------------
                                       Name:
                                       Title:

                                     15

<PAGE>
<PAGE>

                               EXERCISE NOTICE

To ZOLTEK COMPANIES, INC.:

         The undersigned hereby irrevocably elects to purchase _____________
shares of common stock, par value $0.01 per share, of ZOLTEK COMPANIES, INC.
("COMMON STOCK"), pursuant to Warrant No. [ ], originally issued _____, 2006
(the "WARRANT"), and, if such Holder is not utilizing the cashless exercise
provisions set forth in the Warrant, encloses herewith $________ in cash,
certified or official bank check or checks or other immediately available
funds, which sum represents the aggregate Exercise Price (as defined in the
Warrant) for the number of shares of Common Stock to which this Exercise
Notice relates, together with any applicable taxes payable by the
undersigned pursuant to the Warrant.

         By its delivery of this Exercise Notice, the undersigned represents
and warrants to the Company that in giving effect to the exercise evidenced
hereby the Holder will not beneficially own in excess of the number of
shares of Common Stock (determined in accordance with Section 13(d) of the
Securities Exchange Act of 1934) permitted to be owned under Section 11 of
this Warrant to which this notice relates.

         The undersigned requests that certificates for the shares of Common
Stock issuable upon this exercise be issued in the name of

                          PLEASE INSERT SOCIAL SECURITY OR
                          TAX IDENTIFICATION NUMBER

                       (Please print name and address)

                                     16

<PAGE>
<PAGE>

<TABLE>
                                   Warrant Shares Exercise Log
                                   ---------------------------

<CAPTION>
------------------------------------------------------------------------------------------------
Date                   Number of Warrant          Number of Warrant             Number of
                       Shares Available           Shares Exercised              Warrant Shares
                       to be Exercised                                          Remaining to
                                                                                be Exercised
------------------------------------------------------------------------------------------------
<C>                    <C>                        <C>                          <C>

------------------------------------------------------------------------------------------------
</TABLE>

                                     17

<PAGE>
<PAGE>

                             FORM OF ASSIGNMENT

         [To be completed and signed only upon transfer of Warrant]

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto ________________________________ the right represented by the
within Warrant to purchase ____________ shares of Common Stock of ZOLTEK
COMPANIES, INC. to which the within Warrant relates and appoints
________________ attorney to transfer said right on the books of the Company
with full power of substitution in the premises.

Dated:   _______________, ____

                                ---------------------------------------
                                (Signature must conform in all
                                respects to name of holder as
                                specified on the face of the Warrant)

                                ---------------------------------------
                                Address of Transferee

                                ---------------------------------------

                                ---------------------------------------

In the presence of:

--------------------------

                                     18<PAGE>

                                                                 Exhibit 4.5

                                                           Execution Version

                                  EXHIBIT A
                                  ---------

NEITHER THESE SECURITIES NOR THE SECURITIES INTO WHICH THESE SECURITIES ARE
EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION
OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN
AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH
APPLICABLE STATE SECURITIES LAWS AS EVIDENCED BY A LEGAL OPINION OF COUNSEL
TO THE TRANSFEROR TO SUCH EFFECT, THE SUBSTANCE OF WHICH SHALL BE REASONABLY
ACCEPTABLE TO THE COMPANY. THESE SECURITIES AND THE SECURITIES ISSUABLE UPON
EXERCISE OF THESE SECURITIES MAY BE PLEDGED IN A MANNER CONSISTENT WITH THE
SECURITIES ACT IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT SECURED BY SUCH
SECURITIES.

                           ZOLTEK COMPANIES, INC.

                                   WARRANT

Warrant No. [  ]                   Date of Original Issuance: April 28, 2006

         Zoltek Companies, Inc., a Missouri corporation (the "COMPANY"),
hereby certifies that, for value received, [ ] or its registered assigns
(the "HOLDER"), is entitled to purchase from the Company up to a total of
[ ] shares of common stock, par value $0.01 per share (the "COMMON STOCK"), of
the Company (each such share, a "WARRANT SHARE" and all such shares, the
"WARRANT SHARES") at an exercise price equal to $0.01 per share (as adjusted
from time to time as provided in Section 9, the "EXERCISE PRICE"), at any
time and from time to time following from and after the date of the Nasdaq
Approval (as defined in the Amendment) and through and including the 30th
Trading Day following the later of (i) the Nasdaq Approval and (ii) the
Effective Date (the "EXPIRATION DATE"), and subject to the following terms
and conditions:

         1. Definitions. In addition to the terms defined elsewhere in this
            -----------
Warrant, capitalized terms that are not otherwise defined herein shall have
the meanings given to such terms in the Loan and Warrant Agreement, dated as
of September 29, 2005, as amended by Amendment No. 1 (the "Amendment" ,
dated as of April 28, 2006, to which the Company and the original Holder are
parties (the "PURCHASE AGREEMENT").

<PAGE>
<PAGE>

         2. Registration of Warrant. The Company shall register this
            -----------------------
Warrant, upon records to be maintained by the Company for that purpose (the
"WARRANT REGISTER"), in the name of the record Holder hereof from time to
time. The Company may deem and treat the registered Holder of this Warrant
as the absolute owner hereof for the purpose of any exercise hereof or any
distribution to the Holder, and for all other purposes, absent actual notice
to the contrary.

         3. Registration of Transfers. The Company shall register the
            -------------------------
transfer of any portion of this Warrant in the Warrant Register, upon
surrender of this Warrant, with the Form of Assignment attached hereto duly
completed and signed, to the Company at its address specified herein. Upon
any such registration or transfer, a new Warrant to purchase Common Stock,
in substantially the form of this Warrant (any such new Warrant, a "NEW
Warrant"), evidencing the portion of this Warrant so transferred shall be
issued to the transferee and a New Warrant evidencing the remaining portion
of this Warrant not so transferred, if any, shall be issued to the
transferring Holder. The acceptance of the New Warrant by the transferee
thereof shall be deemed the acceptance by such transferee of all of the
rights and obligations of a holder of a Warrant.

         4. Exercise and Duration of Warrants.
            ---------------------------------

                  (a) This Warrant shall be exercisable by the registered
Holder at any time and from time to time on or after the date hereof to and
including the Expiration Date. At 6:30 p.m., New York City time on the
Expiration Date, the portion of this Warrant not exercised prior thereto
shall be and become void and of no value, provided, that if the closing
                                          --------
sales price of the Common Stock on the Expiration Date is greater than 102%
of the Exercise Price on the Expiration Date, then this Warrant shall be
deemed to have been exercised in full (to the extent not previously
exercised) on a "cashless exercise" basis at 6:30 P.M. New York City time on
the Expiration Date. The Company may not call or redeem all or any portion
of this Warrant without the prior written consent of the Holder.

                  (b) Notwithstanding anything to the contrary herein, at
the option of the Holder, the Expiration Date may be extended for the number
of Trading Days during any period occurring after the Effectiveness Date in
which (i) trading in the Common Stock is suspended by any Trading Market,
(ii) the Registration Statement is not effective, or (iii) the prospectus
included in the Registration Statement may not be used by the Holders for
the resale of Registrable Securities thereunder.

         5. Delivery of Warrant Shares.
            --------------------------

                  (a) To effect exercises hereunder, the Holder shall not be
required to physically surrender this Warrant unless the aggregate Warrant
Shares represented by this Warrant is being exercised. Upon delivery of the
Exercise Notice to the Company (with the attached Warrant Shares Exercise
Log) at its address for notice set forth herein and upon payment of the
Exercise Price multiplied by the number of Warrant Shares that the Holder
intends to purchase hereunder, the Company shall promptly (but in no event
later than three Trading Days after the Date of Exercise (as defined
herein)) issue and deliver to the Holder, a certificate for the Warrant
Shares issuable upon such exercise, which, unless otherwise required by the
Purchase Agreement, shall be free of restrictive legends. The Company shall,
upon request of the Holder and subsequent to the date on which a
registration statement covering the

<PAGE>
<PAGE>

resale of the Warrant Shares has been declared effective by the Securities
and Exchange Commission, use its best efforts to deliver Warrant Shares
hereunder electronically through The Depository Trust Corporation or another
established clearing corporation performing similar functions, if available,
provided, that, the Company may, but will not be required to change its
transfer agent if its current transfer agent cannot deliver Warrant Shares
electronically through the Depository Trust Corporation. A "DATE OF
EXERCISE" means the date on which the Holder shall have delivered to
Company: (i) the Exercise Notice (with the Warrant Exercise Log attached to
it), appropriately completed and duly signed and (ii) if such Holder is not
utilizing the cashless exercise provisions set forth in this Warrant,
payment of the Exercise Price for the number of Warrant Shares so indicated
by the Holder to be purchased.

                  (b) If by the third Trading Day after a Date of Exercise
the Company fails to deliver the required number of Warrant Shares in the
manner required pursuant to Section 5(a), then the Holder will have the
right to rescind such exercise.

                  (c) If by the third Trading Day after a Date of Exercise
the Company fails to deliver the required number of Warrant Shares in the
manner required pursuant to Section 5(a), and if after such third Trading
Day and prior to the receipt of such Warrant Shares, the Holder purchases
(in an open market transaction or otherwise) shares of Common Stock to
deliver in satisfaction of a sale by the Holder of the Warrant Shares which
the Holder anticipated receiving upon such exercise (a "BUY-IN"), then the
Company shall (1) pay in cash to the Holder the amount by which (x) the
Holder's total purchase price (including brokerage commissions, if any) for
the shares of Common Stock so purchased exceeds (y) the amount obtained by
multiplying (A) the number of Warrant Shares that the Company was required
to deliver to the Holder in connection with the exercise at issue by (B) the
closing bid price of the Common Stock at the time of the obligation giving
rise to such purchase obligation and (2) at the option of the Holder, either
reinstate the portion of the Warrant and equivalent number of Warrant Shares
for which such exercise was not honored or deliver to the Holder the number
of shares of Common Stock that would have been issued had the Company timely
complied with its exercise and delivery obligations hereunder. The Holder
shall provide the Company written notice indicating the amounts payable to
the Holder in respect of the Buy-In.

                  (d) The Company's obligations to issue and deliver Warrant
Shares in accordance with the terms hereof are absolute and unconditional,
irrespective of any action or inaction by the Holder to enforce the same,
any waiver or consent with respect to any provision hereof, the recovery of
any judgment against any Person or any action to enforce the same, or any
setoff, counterclaim, recoupment, limitation or termination, or any breach
or alleged breach by the Holder or any other Person of any obligation to the
Company or any violation or alleged violation of law by the Holder or any
other Person, and irrespective of any other circumstance which might
otherwise limit such obligation of the Company to the Holder in connection
with the issuance of Warrant Shares. Nothing herein shall limit a Holder's
right to pursue any other remedies available to it hereunder, at law or in
equity including, without limitation, a decree of specific performance
and/or injunctive relief with respect to the Company's failure to timely
deliver certificates representing shares of Common Stock upon exercise of
the Warrant as required pursuant to the terms hereof.

         6. Charges, Taxes and Expenses. Issuance and delivery of
            ---------------------------
certificates for shares of Common Stock upon exercise of this Warrant shall
be made without charge to the Holder for any

<PAGE>
<PAGE>

issue or transfer tax, withholding tax, transfer agent fee or other
incidental tax or expense in respect of the issuance of such certificates,
all of which taxes and expenses shall be paid by the Company; provided,
however, that the Company shall not be required to pay any tax which may be
payable in respect of any transfer involved in the registration of any
certificates for Warrant Shares or Warrants in a name other than that of the
Holder. The Holder shall be responsible for all other tax liability that may
arise as a result of holding or transferring this Warrant or receiving
Warrant Shares upon exercise hereof.

         7. Replacement of Warrant. If this Warrant is mutilated, lost,
            ----------------------
stolen or destroyed, the Company shall issue or cause to be issued in
exchange and substitution for and upon cancellation hereof, or in lieu of
and substitution for this Warrant, a New Warrant, but only upon receipt of
evidence reasonably satisfactory to the Company of such loss, theft or
destruction and customary and reasonable indemnity (which may include a
surety bond for any Holder other than the original Holder of the Warrant),
if requested. Applicants for a New Warrant under such circumstances shall
also comply with such other reasonable regulations and procedures and pay
such other reasonable third-party costs as the Company may prescribe. If a
New Warrant is requested as a result of a mutilation of this Warrant, then
the Holder shall deliver such mutilated Warrant to the Company as a
condition precedent to the Company's obligation to issue the New Warrant.

         8. Reservation of Warrant Shares. The Company covenants that it
            -----------------------------
will at all times reserve and keep available out of the aggregate of its
authorized but unissued and otherwise unreserved Common Stock, solely for
the purpose of enabling it to issue Warrant Shares upon exercise of this
Warrant as herein provided, the number of Warrant Shares which are then
issuable and deliverable upon the exercise of this entire Warrant, free from
preemptive rights or any other contingent purchase rights of persons other
than the Holder (taking into account the adjustments and restrictions of
Section 9). The Company covenants that all Warrant Shares so issuable and
---------
deliverable shall, upon issuance and the payment of the applicable Exercise
Price in accordance with the terms hereof, be duly and validly authorized,
issued and fully paid and nonassessable.

         9. Certain Adjustments. The Exercise Price and number of Warrant
            -------------------
Shares issuable upon exercise of this Warrant are subject to adjustment from
time to time as set forth in this Section 9.
                                  ---------

                  (a) Stock Dividends and Splits. If the Company, at any
                      --------------------------
time while this Warrant is outstanding, (i) pays a stock dividend on its
Common Stock or otherwise makes a distribution on any class of capital stock
that is payable in shares of Common Stock, (ii) subdivides outstanding
shares of Common Stock into a larger number of shares, or (iii) combines
outstanding shares of Common Stock into a smaller number of shares, then in
each such case the Exercise Price shall be multiplied by a fraction of which
the numerator shall be the number of shares of Common Stock outstanding
immediately before such event and of which the denominator shall be the
number of shares of Common Stock outstanding immediately after such event.
Any adjustment made pursuant to clause (i) of this paragraph shall become
effective immediately after the record date for the determination of
shareholders entitled to receive such dividend or distribution, and any
adjustment pursuant to clause (ii) or (iii) of this paragraph shall become
effective immediately after the effective date of such subdivision or
combination. If any event requiring an adjustment under this paragraph
occurs during the period that an Exercise

<PAGE>
<PAGE>

Price is calculated hereunder, then the calculation of such Exercise Price
shall be adjusted appropriately to reflect such event.

                  (b) Pro Rata Distributions. If the Company, at any time
                      ----------------------
while this Warrant is outstanding, distributes to all holders of Common
Stock (i) evidences of its indebtedness, (ii) any security (other than a
distribution of Common Stock covered by the preceding paragraph), (iii)
rights or warrants to subscribe for or purchase any security, or (iv) any
other asset (in each case, "DISTRIBUTED PROPERTY"), then, at the request of
any Holder delivered before the 90th day after the record date fixed for
determination of shareholders entitled to receive such distribution, the
Company will deliver to such Holder, within five Trading Days after such
request (or, if later, on the effective date of such distribution), the
Distributed Property that such Holder would have been entitled to receive in
respect of the Warrant Shares for which such Holder's Warrant could have
been exercised immediately prior to such record date. If such Distributed
Property is not delivered to a Holder pursuant to the preceding sentence,
then upon any exercise of the Warrant that occurs after such record date,
such Holder shall be entitled to receive, in addition to the Warrant Shares
otherwise issuable upon such conversion, the Distributed Property that such
Holder would have been entitled to receive in respect of such number of
Warrant Shares had the Holder been the record holder of such Warrant Shares
immediately prior to such record date. Notwithstanding the foregoing, this
Section 9(b) shall not apply to any distribution of rights or securities in
respect of adoption by the Company of a shareholder rights plan which events
shall be covered by the anti-dilution provisions of Section 9(a).

                  (c) Fundamental Transactions. If, at any time while this
                      ------------------------
Warrant is outstanding, (1) the Company effects any merger or consolidation
of the Company with or into another Person, (2) the Company effects any sale
of all or substantially all of its assets in one or a series of related
transactions, (3) any tender offer or exchange offer approved or authorized
by the Board of Directors of the Company (whether by the Company or another
Person) is completed pursuant to which holders of Common Stock are permitted
to tender or exchange their shares for other securities, cash or property,
or (4) the Company effects any reclassification of the Common Stock or any
compulsory share exchange pursuant to which the Common Stock is effectively
converted into or exchanged for other securities, cash or property (in any
such case, a "FUNDAMENTAL TRANSACTION"), then the Holder shall have the
right thereafter to receive, upon exercise of this Warrant, the same amount
and kind of securities, cash or property as it would have been entitled to
receive upon the occurrence of such Fundamental Transaction if it had been,
immediately prior to such Fundamental Transaction, the holder of the number
of Warrant Shares then issuable upon exercise in full of this Warrant (the
"ALTERNATE CONSIDERATION"). For purposes of any such exercise, the
determination of the Exercise Price shall be appropriately adjusted to apply
to such Alternate Consideration based on the amount of Alternate
Consideration issuable in respect of one share of Common Stock in such
Fundamental Transaction, and the Company shall apportion the Exercise Price
among the Alternate Consideration in a reasonable manner reflecting the
relative value of any different components of the Alternate Consideration.
If holders of Common Stock are given any choice as to the securities, cash
or property to be received in a Fundamental Transaction, then the Holder
shall be given the same choice as to the Alternate Consideration it receives
upon any exercise of this Warrant following such Fundamental Transaction. At
the Holder's option and request, any successor to the Company or surviving
entity in such Fundamental Transaction shall, either (1) issue to the Holder
a new warrant substantially in the form of this Warrant and consistent with
the foregoing provisions and evidencing the Holder's right to purchase the
Alternate

<PAGE>
<PAGE>

Consideration for the aggregate Exercise Price upon exercise thereof, or (2)
purchase the Warrant from the Holder for a purchase price, payable in cash
within five Trading Days after such request (or, if later, on the effective
date of the Fundamental Transaction), equal to the Black Scholes value of
the remaining unexercised portion of this Warrant on the date of such
request as well as assumptions reasonably mutually acceptable to the Company
and the Holder, provided, that for purposes of such calculation, the market
                --------
price of the Common Stock shall be the closing bid price of the Common Stock
on the Trading Day immediately preceding the public announcement of the
Fundamental Transaction and the volatility factor shall be determined by
reference to the 12 month average industry volatility measures. The terms of
any agreement pursuant to which a Fundamental Transaction is effected shall
include terms requiring any such successor or surviving entity to comply
with the provisions of this paragraph (c) and insuring that the Warrant (or
any such replacement security) will be similarly adjusted upon any
subsequent transaction analogous to a Fundamental Transaction.

                  (d) Subsequent Equity Sales.
                      -----------------------

                           (i) While any portion of this Warrant is
outstanding, if the Company issues any shares of Common Stock or the Company
or any subsidiary thereof issues any rights, warrants, options or other
securities or debt that is convertible into, exchangeable for (any such
securities, "COMMON STOCK EQUIVALENTS") entitling any Person to acquire
shares of Common Stock, at a price per share less than the Exercise Price
(if the holder of the Common Stock or Common Stock Equivalent so issued
shall at any time, whether by operation of purchase price adjustments, reset
provisions, floating conversion, exercise or exchange prices or otherwise,
or due to warrants, options or rights issued in connection with such
issuance, be entitled to receive shares of Common Stock at a price less than
the Exercise Price, such issuance shall be deemed to have occurred for less
than the Exercise Price), then the Exercise Price shall be adjusted to equal
the conversion, exchange or purchase price for such Common Stock or Common
Stock Equivalents (including any reset provisions thereof) at issue and
which adjusted Exercise Price shall continue for as long as this Warrants
remain outstanding. Such adjustment shall be made whenever such Common Stock
or Common Stock Equivalents are issued. The Company shall notify the Holder
in writing, no later than the Trading Day following the issuance of any
Common Stock or Common Stock Equivalent subject to this section, indicating
therein the applicable issuance price, or of applicable reset price,
exchange price, conversion price and other pricing terms.

                           (ii) For purposes of this subsection 9(d), the
following subsections (d)(ii)(l) to (d)(ii)(6) shall also be applicable:

                                    (1) Issuance of Rights or Options. In
                                        -----------------------------
case at any time the Company shall in any manner grant (directly and not by
assumption in a merger or otherwise) any warrants or other rights to
subscribe for or to purchase, or any options for the purchase of, Common
Stock or any stock or security convertible into or exchangeable for Common
Stock (such warrants, rights or options being called "OPTIONS" and such
convertible or exchangeable stock or securities being called "CONVERTIBLE
SECURITIES") whether or not such Options or the right to convert or exchange
any such Convertible Securities are immediately exercisable, and the price
per share for which Common Stock is issuable upon the exercise of such
Options or upon the conversion or exchange of such Convertible Securities
(determined by dividing (i) the

<PAGE>
<PAGE>

sum (which sum shall constitute the applicable consideration) of (x) the
total amount, if any, received or receivable by the Company as consideration
for the granting of such Options, plus (y) the aggregate amount of
additional consideration payable to the Company upon the exercise of all
such Options, plus (z), in the case of such Options which relate to
Convertible Securities, the aggregate amount of additional consideration, if
any, payable upon the issue or sale of such Convertible Securities and upon
the conversion or exchange thereof, by (ii) the total maximum number of
shares of Common Stock issuable upon the exercise of such Options or upon
the conversion or exchange of all such Convertible Securities issuable upon
the exercise of such Options) shall be less than the Exercise Price in
effect immediately prior to the time of the granting of such Options, then
the total number of shares of Common Stock issuable upon the exercise of
such Options or upon conversion or exchange of the total amount of such
Convertible Securities issuable upon the exercise of such Options shall be
deemed to have been issued for such price per share as of the date of
granting of such Options or the issuance of such Convertible Securities and
thereafter shall be deemed to be outstanding for purposes of adjusting the
Exercise Price. Except as otherwise provided in subsection 9(d)(ii)(3), no
adjustment of the Exercise Price shall be made upon the actual issue of such
Common Stock or of such Convertible Securities upon exercise of such Options
or upon the actual issue of such Common Stock upon conversion or exchange of
such Convertible Securities.

                                    (2) Issuance of Convertible Securities.
                                        ----------------------------------
In case the Company shall in any manner issue (directly and not by
assumption in a merger or otherwise) or sell any Convertible Securities,
whether or not the rights to exchange or convert any such Convertible
Securities are immediately exercisable, and the price per share for which
Common Stock is issuable upon such conversion or exchange (determined by
dividing (i) the sum (which sum shall constitute the applicable
consideration) of (x) the total amount received or receivable by the Company
as consideration for the issue or sale of such Convertible Securities, plus
(y) the aggregate amount of additional consideration, if any, payable to the
Company upon the conversion or exchange thereof, by (ii) the total number of
shares of Common Stock issuable upon the conversion or exchange of all such
Convertible Securities) shall be less than the Exercise Price in effect
immediately prior to the time of such issue or sale, then the total maximum
number of shares of Common Stock issuable upon conversion or exchange of all
such Convertible Securities shall be deemed to have been issued for such
price per share as of the date of the issue or sale of such Convertible
Securities and thereafter shall be deemed to be outstanding for purposes of
adjusting the Exercise Price, provided that (a) except as otherwise provided
in subsection 9(d)(ii)(3), no adjustment of the Exercise Price shall be made
upon the actual issuance of such Common Stock upon conversion or exchange of
such Convertible Securities and (b) no further adjustment of the Exercise
Price shall be made by reason of the issue or sale of Convertible Securities
upon exercise of any Options to purchase any such Convertible Securities for
which adjustments of the Exercise Price have been made pursuant to the other
provisions of subsection 9(d).

                                    (3) Change in Option Price or Conversion
                                        ------------------------------------
Rate. Upon the happening of any of the following events, namely, if the
----
purchase price provided for in any Option referred to in subsection
9(d)(ii)(l) hereof, the additional consideration, if any, payable upon the
conversion or exchange of any Convertible Securities referred to in
subsections 9(d)(ii)(l) or 9(d)(ii)(2), or the rate at which Convertible
Securities referred to in subsections 9(d)(ii)(l) or 9(d)(ii)(2) are
convertible into or exchangeable for Common Stock shall change at

<PAGE>
<PAGE>

any time (including, but not limited to, changes under or by reason of
provisions designed to protect against dilution), the Exercise Price in
effect at the time of such event shall forthwith be readjusted to the
Exercise Price which would have been in effect at such time had such Options
or Convertible Securities still outstanding provided for such changed
purchase price, additional consideration or conversion rate, as the case may
be, at the time initially granted, issued or sold. On the termination of any
Option for which any adjustment was made pursuant to this subsection 9(d) or
any right to convert or exchange Convertible Securities for which any
adjustment was made pursuant to this subsection 9(d) (including without
limitation upon the redemption or purchase for consideration of such
Convertible Securities by the Company), the Exercise Price then in effect
hereunder shall forthwith be changed to the Exercise Price which would have
been in effect at the time of such termination had such Option or
Convertible Securities, to the extent outstanding immediately prior to such
termination, never been issued.

                                    (4) Stock Dividends. Subject to the
                                        ---------------
provisions of this Section 9(d), in case the Company shall declare a
dividend or make any other distribution upon any stock of the Company (other
than the Common Stock) payable in Common Stock, Options or Convertible
Securities, then any Common Stock, Options or Convertible Securities, as the
case may be, issuable in payment of such dividend or distribution shall be
deemed to have been issued or sold without consideration.

                                    (5) Consideration for Stock. In case any
                                        -----------------------
shares of Common Stock, Options or Convertible Securities shall be issued or
sold for cash, the consideration received therefor shall be deemed to be the
net amount received by the Company therefor, after deduction therefrom of
any expenses incurred or any underwriting commissions or concessions paid or
allowed by the Company in connection therewith. In case any shares of Common
Stock, Options or Convertible Securities shall be issued or sold for a
consideration other than cash, the amount of the consideration other than
cash received by the Company shall be deemed to be the fair value of such
consideration as determined in good faith by the Board of Directors of the
Company, after deduction of any expenses incurred or any underwriting
commissions or concessions paid or allowed by the Company in connection
therewith. In case any Options shall be issued in connection with the issue
and sale of other securities of the Company, together comprising one
integral transaction in which no specific consideration is allocated to such
Options by the parties thereto, such Options shall be deemed to have been
issued for such consideration as determined in good faith by the Board of
Directors of the Company. If Common Stock, Options or Convertible Securities
shall be issued or sold by the Company and, in connection therewith, other
Options or Convertible Securities (the "ADDITIONAL RIGHTS") are issued, then
the consideration received or deemed to be received by the Company shall be
reduced by the fair market value of the Additional Rights (as determined
using the Black-Scholes option pricing model or another method mutually
agreed to by the Company and the Holder). The Board of Directors of the
Company shall respond promptly, in writing, to an inquiry by the Holders as
to the fair market value of the Additional Rights. In the event that the
Board of Directors of the Company and the Holders are unable to agree upon
the fair market value of the Additional Rights, the Company and the Holders
shall jointly select an appraiser, who is experienced in such matters. The
decision of such appraiser shall be final and conclusive, and the cost of
such appraiser shall be borne evenly by the Company and the Holder.

<PAGE>
<PAGE>

                                    (6) Record Date. In case the Company
                                        -----------
shall take a record of the holders of its Common Stock for the purpose of
entitling them (i) to receive a dividend or other distribution payable in
Common Stock, Options or Convertible Securities or (ii) to subscribe for or
purchase Common Stock, Options or Convertible Securities, then such record
date shall be deemed to be the date of the issue or sale of the shares of
Common Stock deemed to have been issued or sold upon the declaration of such
dividend or the making of such other distribution or the date of the
granting of such right of subscription or purchase, as the case may be.

                           (iii) Notwithstanding the foregoing, no
adjustment will be made under this Section 9(d) as a result of: (i) the
issuance of securities upon the exercise or conversion of any Common Stock
Equivalents issued by the Company prior to the date of this Agreement (but
will apply to any amendments, modifications and reissuances thereof), (ii)
the grant of options or warrants, or the issuance of additional securities,
under any duly authorized company stock option, stock incentive plan,
restricted stock plan or stock purchase plan in existence on the First
Closing Date, (iii) the issuance of Common Stock in payment of interest on
the 2005 Notes, 2004 Notes, the 2003 Debentures, the 2004 Debentures or the
Notes, (iv) the issuance of Common Stock Equivalents pursuant to a Strategic
Transaction, or (v) the issuance of Common Stock pursuant to the provisions
of Section 2(c) of the Registration Rights Agreement.

                  (e) Number of Warrant Shares. Simultaneously with any
                      ------------------------
adjustment to the Exercise Price pursuant to paragraph (a) of this Section,
the number of Warrant Shares that may be purchased upon exercise of this
Warrant shall be increased or decreased proportionately, so that after such
adjustment the aggregate Exercise Price payable hereunder for the adjusted
number of Warrant Shares shall be the same as the aggregate Exercise Price
in effect immediately prior to such adjustment.

                  (f) Calculations. All calculations under this Section 9
                      ------------                              ---------
shall be made to the nearest cent or the nearest 1/100th of a share, as
applicable. The number of shares of Common Stock outstanding at any given
time shall not include shares owned or held by or for the account of the
Company, and the disposition of any such shares shall be considered an issue
or sale of Common Stock.

                  (g) Notice of Adjustments. Upon the occurrence of each
                      ---------------------
adjustment pursuant to this Section 9, the Company at its expense will
                            ---------
promptly compute such adjustment in accordance with the terms of this
Warrant and prepare a certificate setting forth such adjustment, including a
statement of the adjusted Exercise Price and adjusted number or type of
Warrant Shares or other securities issuable upon exercise of this Warrant
(as applicable), describing the transactions giving rise to such adjustments
and showing in detail the facts upon which such adjustment is based. Upon
written request, the Company will promptly deliver a copy of each such
certificate to the Holder and to the Company's transfer agent.

                  (h) Notice of Corporate Events. If the Company (i)
                      --------------------------
declares a dividend or any other distribution of cash, securities or other
property in respect of its Common Stock, including without limitation any
granting of rights or warrants to subscribe for or purchase any capital
stock of the Company or any Subsidiary, (ii) authorizes or approves, enters
into any agreement contemplating or solicits shareholder approval for any
Fundamental Transaction or (iii) authorizes the voluntary dissolution,
liquidation or winding up of the affairs of the Company,

<PAGE>
<PAGE>

then the Company shall deliver to the Holder a notice describing the
material terms and conditions of such transaction, at least 20 calendar days
prior to the applicable record or effective date on which a Person would
need to hold Common Stock in order to participate in or vote with respect to
such transaction, and the Company will take all steps reasonably necessary
in order to insure that the Holder is given the practical opportunity to
exercise this Warrant prior to such time so as to participate in or vote
with respect to such transaction; provided, however, that the failure to
deliver such notice or any defect therein shall not affect the validity of
the corporate action required to be described in such notice.

         10. Payment of Exercise Price. The Holder may pay the Exercise
             -------------------------
Price in one of the following manners:

                  (a) Cash Exercise. The Holder may deliver immediately
                      -------------
available funds; or

                  (b) Cashless Exercise. The Holder may notify the Company
                      -----------------
in an Exercise Notice of its election to utilize cashless exercise, in which
event the Company shall issue to the Holder the number of Warrant Shares
determined as follows:

                                    X = Y [(A-B)/A]

                           where:
                                    X = the number of Warrant Shares to be
                                    issued to the Holder.

                                    Y = the number of Warrant Shares with
                                    respect to which this Warrant is being
                                    exercised.

                                    A = the average of the closing prices
                                    for the five Trading Days immediately
                                    prior to (but not including) the
                                    Exercise Date.

                                    B = the Exercise Price.

For purposes of Rule 144 promulgated under the Securities Act, it is
intended, understood and acknowledged that the Warrant Shares issued in a
cashless exercise transaction shall be deemed to have been acquired by the
Holder, and the holding period for the Warrant Shares shall be deemed to
have commenced, on the date this Warrant was originally issued.

         11. Limitations on Exercise.
             -----------------------

                           (i) Notwithstanding anything to the contrary
contained herein, the number of shares of Common Stock that may be acquired
by a Holder upon any exercise of Warrants (or otherwise in respect hereof)
shall be limited to the extent necessary to insure that, following such
exercise (or other issuance), the total number of shares of Common Stock
then beneficially owned by such Holder and its Affiliates and any other
Persons whose beneficial ownership of Common Stock would be aggregated with
such Holder's for purposes of Section 13(d) of the Exchange Act, does not
exceed 4.999% (the "THRESHOLD PERCENTAGE") or 9.999% (the "MAXIMUM
PERCENTAGE") of the total number of issued and outstanding shares of Common
Stock (including for such purpose the shares of Common Stock issuable upon
such conversion). For such purposes, beneficial ownership shall be
determined in accordance with Section 13(d) of

<PAGE>
<PAGE>

the Exchange Act and the rules and regulations promulgated thereunder. Each
delivery of an Exercise Notice hereunder will constitute a representation by
the Holder that it has evaluated the limitation set forth in this paragraph
and determined that issuance of the full number of Warrant Shares requested
in such Exercise Notice is permitted under this paragraph. The Company's
obligation to issue shares of Common Stock in excess of the limitation
referred to in this Section shall be suspended (and shall not terminate or
expire notwithstanding any contrary provisions hereof) until such time, if
any, as such shares of Common Stock may be issued in compliance with such
limitation, but in no event later than the Expiration Date. By written
notice to the Company, the Holder may waive the provisions of this Section
or increase or decrease the Maximum Percentage to any other percentage
specified in such notice, but (i) any such waiver or increase will not be
effective until the 61st day after such notice is delivered to the Company,
and (ii) any such waiver or increase or decrease will apply only to the
Holder and not to any other holder of Warrants.

                           (ii) Notwithstanding anything to the contrary in
this Warrant, if the Company has not previously obtained Shareholder
Approval (as defined below), then the Company may not issue shares of Common
Stock in excess of the (a) the Issuable Maximum or (b) a number of shares
above which the issuance of one additional share would cause a Change of
Control (a "CHANGE OF CONTROL THRESHOLD") upon exercise of this Warrant at
an exercise price which is less than the Closing Price on the Trading Day
immediately preceding the Original Issue Date (the "THRESHOLD PRICE"). The
"Issuable Maximum" means, as of any date, a number of shares of Common Stock
equal to 19.99% of the outstanding shares of Common Stock immediately
preceding the First Closing Date, less such number of shares of Common Stock
as have been issued at a price below the Threshold Price (1) upon exercise
of the Warrants and warrants issued under the 2003 Securities Purchase
Agreement, the 2004 Securities Purchase Agreement, 2004 Loan Agreement or
the 2005 Loan Agreement, (2) upon conversion of the 2003 Debentures, the
2004 Debentures, the 2004 Notes, and the 2005 Notes and (3) upon conversion
of the Notes, or in payment of interest thereunder. Each Holder shall be
entitled to a portion of the Issuable Maximum or Change of Control
Threshold, as applicable, equal to the quotient obtained by dividing: (x)
the principal amount of Notes issued and sold to such Holder on the Original
Issue Date by (y) the aggregate principal amount of all Notes issued and
sold by the Company on the Original Issue Date. If any Holder shall no
longer hold Notes, then such Holder's remaining portion of the Issuable
Maximum or Change of Control Threshold, as applicable, (other than those
represented by the remaining portion of this Warrant and the other warrants
referenced in clause (1) above) shall be allocated pro-rata among the
remaining Holders, giving effect to the Company's desire to allocate among
the class of securities known as the Notes this limitation. If on any Date
of Exercise, or at such time as a Holder shall notify the Company that the
condition in (A) following this clause shall be in effect: (A) the aggregate
number of shares of Common Stock that would then be issuable upon exercise
in full of this Warrant would exceed the Issuable Maximum or would exceed
the Change of Control Threshold on such date, and (B) the Company shall not
have previously obtained the vote of shareholders applicable to approve the
issuance of shares of Common Stock in excess of the Issuable Maximum or
Change of Control Threshold, as applicable, pursuant to the terms hereof
(the "SHAREHOLDER APPROVAL"), then, the Company shall, on such Date of
Exercise or on any Date of Exercise prior to the receipt by the Company of
the Shareholder Approval, shall issue upon exercise hereof a number of
shares of Common Stock equal to the Issuable Maximum or Change of Control
Threshold, as applicable, and, with respect to the remainder of this Warrant
for which

<PAGE>
<PAGE>

an exercise would result in an issuance of shares of Common Stock in excess
of the Issuable Maximum or Change of Control Threshold, the Company must
seek Shareholder Approval in accordance with subsection (iii) below. The
Company and the Holder understand and agree that shares of Common Stock
issued to and then held by the Holder as a result of exercises of this
Warrant shall not be entitled to cast votes on any resolution to obtain
Shareholder Approval pursuant hereto.

                           (iii) Shareholder Approval.
                                 --------------------

                                    (1) If required under applicable Nasdaq
regulations, the Company shall use its best efforts to obtain as soon as
possible but in no event later than 90 days following the date of the Loan
Agreement or 120 days in the event the proxy materials shall be reviewed by
the Commission, shareholder approval of the issuance of the Underlying
Shares (the "SHAREHOLDER PROPOSAL"), which approval shall meet the
requirements of Nasdaq's Rule 4350(i) of Nasdaq set forth in the NASD Manual
(the "SHAREHOLDER APPROVAL DATE").

                                    (2) As soon as practicable following the
date of the Loan Agreement, but in no event more than 30 days following the
date of the Loan Agreement, the Company shall prepare and file with the
Commission proxy materials calling a special meeting (the "SPECIAL MEETING")
of its shareholders seeking approval of the Shareholder Proposal. The
Company shall use its reasonable best efforts to cause such proxy materials
to reach the "no further comment" stage as soon as possible (the "CLEARANCE
DATE") and to hold the Special Meeting as soon as possible following the
Clearance Date, but in no event later than 45 days following the Clearance
Date.

                                    (3) The Board of Directors shall
recommend approval thereof by the Company's shareholders. The Company shall
mail and distribute its proxy materials for the Special Meeting to its
shareholders at least 30 days prior to the date of the Special Meeting and
shall actively solicit proxies to vote for the Shareholder Proposal. The
Company shall provide the Holders an opportunity to review and comment on
such proxy materials by providing (which may be by e-mail) copies of such
proxy materials and any revised preliminary proxy materials to the Holders
at least three (3) days prior to their filing with the Commission. The
Company shall provide the Holders (which may be by e-mail) copies of all
correspondence from or to the Commission or its staff concerning the proxy
materials for the Special Meeting promptly after the same is sent or
received by the Company and summaries of any comments of the Commission's
staff which the Company receives orally promptly after receiving such oral
comments. The Company shall (i) furnish to the Holders and their counsel
(which may be by e-mail) a copy of its definitive proxy materials for the
Special Meeting and any amendments or supplements thereto promptly after the
same are first used, mailed to shareholders or filed with the Commission,
(ii) inform the Holders of the progress of solicitation of proxies for such
meeting and (iii) inform the Holders of any adjournment of the Special
Meeting and shall report the result of the vote of shareholders on the
Shareholder Proposal at the conclusion of the Special Meeting.

                                    (4) If for any reason the Shareholder
Proposal is not approved at the Special Meeting, the Company will take such
additional acts or actions as are necessary to hold an additional Special
Meeting to consider the Shareholder Proposal and in conjunction

<PAGE>
<PAGE>

therewith shall hire a nationally recognized proxy solicitation firm,
selected by the Holders which is reasonably satisfactory to the Company, to
assist it in obtaining the necessary shareholder votes to approve the
Shareholder Proposal. The Company shall bear all costs and expenses of the
preparation and filing of any and all proxy materials and Special Meetings,
including but not limited to the costs and expenses of the proxy
solicitation firm if needed.

         12. No Fractional Shares. No fractional shares of Warrant Shares
             --------------------
will be issued in connection with any exercise of this Warrant. In lieu of
any fractional shares which would, otherwise be issuable, the Company shall
pay cash equal to the product of such fraction multiplied by the closing
price of one Warrant Share as reported by the applicable Trading Market on
the date of exercise.

         13. Notices. Any and all notices or other communications or
             -------
deliveries hereunder (including, without limitation, any Exercise Notice)
shall be in writing and shall be deemed given and effective on the earliest
of (i) the date of transmission, if such notice or communication is
delivered via facsimile at the facsimile number specified in this Section
prior to 6:30 p.m. (New York City time) on a Trading Day, (ii) the next
Trading Day after the date of transmission, if such notice or communication
is delivered via facsimile at the facsimile number specified in this Section
on a day that is not a Trading Day or later than 6:30 p.m. (New York City
time) on any Trading Day, (iii) the Trading Day following the date of
mailing, if sent by nationally recognized overnight courier service, or (iv)
upon actual receipt by the party to whom such notice is required to be
given. The addresses for such communications shall be: (i) if to the
Company, to Zoltek Companies, Inc., 3101 McKelvey Road, St. Louis, Missouri
63044, Attn: Chief Financial Officer, Facsimile No.: (314) 291-9082, or (ii)
if to the Holder, to the address or facsimile number appearing on the
Warrant Register or such other address or facsimile number as the Holder may
provide to the Company in accordance with this Section.

         14. Warrant Agent. The Company shall serve as warrant agent under
             -------------
this Warrant. Upon 30 days' notice to the Holder, the Company may appoint a
new warrant agent. Any corporation into which the Company or any new warrant
agent may be merged or any corporation resulting from any consolidation to
which the Company or any new warrant agent shall be a party or any
corporation to which the Company or any new warrant agent transfers
substantially all of its corporate trust or shareholders services business
shall be a successor warrant agent under this Warrant without any further
act. Any such successor warrant agent shall promptly cause notice of its
succession as warrant agent to be mailed (by first class mail, postage
prepaid) to the Holder at the Holder's last address as shown on the Warrant
Register.

         15. Miscellaneous.
             -------------

                  (a) This Warrant shall be binding on and inure to the
benefit of the parties hereto and their respective successors and assigns.
Subject to the preceding sentence, nothing in this Warrant shall be
construed to give to any Person other than the Company and the Holder any
legal or equitable right, remedy or cause of action under this Warrant. This
Warrant may be amended only in writing signed by the Company and the Holder
and their successors and assigns.

                  (b) All questions concerning the construction, validity,
enforcement and interpretation of this Warrant shall be governed by and
construed and enforced in accordance

<PAGE>
<PAGE>

with the internal laws of the State of New York, without regard to the
principles of conflicts of law thereof. Each party agrees that all legal
proceedings concerning the interpretations, enforcement and defense of this
Warrant and the transactions herein contemplated ("PROCEEDINGS") (whether
brought against a party hereto or its respective Affiliates, employees or
agents) shall be commenced exclusively in the state and federal courts
sitting in the City of New York, Borough of Manhattan (the "NEW YORK
COURTS"). Each party hereto hereby irrevocably submits to the exclusive
jurisdiction of the New York Courts for the adjudication of any dispute
hereunder or in connection herewith or with any transaction contemplated
hereby or discussed herein, and hereby irrevocably waives, and agrees not to
assert in any Proceeding, any claim that it is not personally subject to the
jurisdiction of any New York Court, or that such Proceeding has been
commenced in an improper or inconvenient forum. Each party hereto hereby
irrevocably waives personal service of process and consents to process being
served in any such Proceeding by mailing a copy thereof via registered or
certified mail or overnight delivery (with evidence of delivery) to such
party at the address in effect for notices to it under this Warrant and
agrees that such service shall constitute good and sufficient service of
process and notice thereof. Nothing contained herein shall be deemed to
limit in any way any right to serve process in any manner permitted by law.
Each party hereto hereby irrevocably waives, to the fullest extent permitted
by applicable law, any and all right to trial by jury in any legal
proceeding arising out of or relating to this Warrant or the transactions
contemplated hereby. If either party shall commence a Proceeding to enforce
any provisions of this Warrant, then the prevailing party in such Proceeding
shall be reimbursed by the other party for its attorney's fees and other
costs and expenses incurred with the investigation, preparation and
prosecution of such Proceeding.

                  (c) The headings herein are for convenience only, do not
constitute a part of this Warrant and shall not be deemed to limit or affect
any of the provisions hereof.

                  (d) In case any one or more of the provisions of this
Warrant shall be invalid or unenforceable in any respect, the validity and
enforceability of the remaining terms and provisions of this Warrant shall
not in any way be affected or impaired thereby and the parties will attempt
in good faith to agree upon a valid and enforceable provision which shall be
a commercially reasonable substitute therefor, and upon so agreeing, shall
incorporate such substitute provision in this Warrant.

                [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK,
                           SIGNATURE PAGE FOLLOWS]

<PAGE>
<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed by its authorized officer as of the date first indicated above.

                                   ZOLTEK COMPANIES, INC.

                                    By:
                                       -----------------------------------------
                                       Name:
                                       Title:

<PAGE>
<PAGE>

                               EXERCISE NOTICE

To ZOLTEK COMPANIES, INC.:

         The undersigned hereby irrevocably elects to purchase _____________
shares of common stock, par value $0.01 per share, of ZOLTEK COMPANIES, INC.
("COMMON STOCK"), pursuant to Warrant No. [ ], originally issued April __,
2006 (the "WARRANT"), and, if such Holder is not utilizing the cashless
exercise provisions set forth in the Warrant, encloses herewith $________ in
cash, certified or official bank check or checks or other immediately
available funds, which sum represents the aggregate Exercise Price (as
defined in the Warrant) for the number of shares of Common Stock to which
this Exercise Notice relates, together with any applicable taxes payable by
the undersigned pursuant to the Warrant.

         By its delivery of this Exercise Notice, the undersigned represents
and warrants to the Company that in giving effect to the exercise evidenced
hereby the Holder will not beneficially own in excess of the number of
shares of Common Stock (determined in accordance with Section 13(d) of the
Securities Exchange Act of 1934) permitted to be owned under Section 11 of
this Warrant to which this notice relates.

         The undersigned requests that certificates for the shares of Common
Stock issuable upon this exercise be issued in the name of

                                     PLEASE INSERT SOCIAL SECURITY OR
                                     TAX IDENTIFICATION NUMBER

                       (Please print name and address)

<PAGE>
<PAGE>

<TABLE>
                                             Warrant Shares Exercise Log
                                             ---------------------------

<CAPTION>
--------------------------------------------------------------------------------------------------------------------
Date                          Number of Warrant Shares      Number of Warrant Shares           Number of Warrant
                              Available to be Exercised     Exercised                          Shares Remaining to
                                                                                               be Exercised
--------------------------------------------------------------------------------------------------------------------
<C>                          <C>                            <C>                                <C>

--------------------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>
<PAGE>

                             FORM OF ASSIGNMENT

         [To be completed and signed only upon transfer of Warrant]

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto ________________________________ the right represented by the
within Warrant to purchase ____________ shares of Common Stock of ZOLTEK
COMPANIES, INC. to which the within Warrant relates and appoints
________________ attorney to transfer said right on the books of the Company
with full power of substitution in the premises.

Dated:   _______________, ____

                                       ---------------------------------------
                                       (Signature  must  conform in all respects
                                       to name of holder as specified on the
                                       face of the Warrant)

                                       ---------------------------------------
                                       Address of Transferee

                                       ---------------------------------------

                                       ---------------------------------------

In the presence of:

--------------------------

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