Document:

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                                                                    EXHIBIT 10.3

                             STOCK PURCHASE WARRANT

                          To Subscribe for and Purchase
                                 Common Stock of

                                   Aksys, Ltd.

          THIS CERTIFIES THAT, for value received, U.S. Bancorp Piper Jaffray
Inc. (herein called "Purchaser"), or registered assigns, is entitled to
subscribe for and purchase from Aksys, Ltd. (herein called the "Company"), a
corporation organized and existing under the laws of the State of Delaware, at
the price specified below (subject to adjustment as noted below) at any time
after June 19, 2002 to and including December 19, 2006 (the "Expiration Date")
One Hundred Fifty-Nine Thousand Seven Hundred Sixty-Two (159,762) fully paid and
nonassessable shares of Common Stock (herein the "Common Stock") (subject to
adjustment as noted below). This Warrant has been issued pursuant to an
Engagement Agreement dated as of October 5, 2001 between Purchaser and the
Company.

          The warrant purchase price (subject to adjustment as noted below)
shall be $4.90 per share.

          This Warrant is subject to the following provisions, terms and
conditions:

          1.   The rights represented by this Warrant may be exercised by the
holder hereof, in whole or in part, by written notice of exercise delivered to
the Company and by the surrender of this Warrant (properly endorsed if required)
at the principal office of the Company and upon payment to it by wire transfer
of the purchase price for such shares. The Company agrees that the shares so
purchased shall be and are deemed to be issued to the holder hereof as the
record owner of such shares as of the close of business on the date on which
this Warrant shall have been surrendered and payment made for such shares as
aforesaid. Subject to the provisions of the next succeeding paragraph, the
Company shall use its best efforts to cause certificates for the shares of stock
so purchased to be delivered to the holder hereof within a reasonable time, not
exceeding 10 days, after the rights represented by this Warrant shall have been
so exercised, and, unless this Warrant has expired, a new Warrant representing
the number of shares, if any, with respect to which this Warrant shall not then
have been exercised shall also be delivered to the holder hereof within such
time.

          2.   Notwithstanding the foregoing, however, the Company shall not be
required to deliver any certificate for shares of stock upon exercise of this
Warrant except in accordance with the provisions, and subject to the
limitations, of paragraph 7 hereof.

          3.   The Company represents and warrants that this Warrant has been
duly authorized by all necessary corporate action, has been duly executed and
delivered and is a legal and binding obligation of the Company. The Company
covenants and agrees that all shares which are issued upon the exercise of the
rights represented by this Warrant according to the terms hereof will, upon
issuance, be duly authorized and issued, fully paid and nonassessable. The
Company further covenants and agrees that during the period within which the
rights represented by this

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Warrant may be exercised, the Company will at all times have authorized, and
reserved for the purpose of issue or transfer upon exercise of the subscription
rights evidenced by this Warrant, a sufficient number of shares of its Common
Stock to provide for the exercise of the rights represented by this Warrant.

          4.   The above provisions are, however, subject to the following:

          (a)  The warrant purchase price shall, from and after the date of
issuance of this Warrant, be subject to adjustment from time to time as
hereinafter provided. Upon each adjustment of the warrant purchase price, the
holder of this Warrant shall thereafter be entitled to purchase, at the warrant
purchase price resulting from such adjustment, the number of shares obtained by
multiplying the warrant purchase price in effect immediately prior to such
adjustment by the number of shares purchasable pursuant hereto immediately prior
to such adjustment and dividing the product thereof by the warrant purchase
price resulting from such adjustment.

          (b)  In case the Company shall (i) make a dividend upon the Common
Stock payable in Common Stock (other than a dividend declared to effect a
subdivision of the outstanding shares of Common Stock, as described in
subparagraph (b) below) or any obligations or any shares of stock of the Company
which are convertible into or exchangeable for Common Stock (such obligations or
shares of stock being hereinafter referred to as "Convertible Securities"), or
in any rights or options to purchase any Common Stock or Convertible Securities,
or (ii) make any other dividend or make any other distribution upon the Common
Stock payable otherwise than out of earnings or surplus, then thereafter the
holder of this Warrant upon the exercise hereof will be entitled to receive the
number of shares of Common Stock to which such holder shall be entitled upon
such exercise, and, in addition and without further payment therefor, such
number of shares of Common Stock, such that upon exercise hereof, such holder
would receive such number of shares of Common Stock as a result of each dividend
described in clause (i) above and each dividend or distribution described in
clause (ii) above which such holder would have received by way of any such
dividend or distribution if continuously since the record date for any such
dividend or distribution such holder (i) had been the record holder of the
number of shares of Common Stock then received, and (ii) had retained all
dividends or distributions in stock or securities (including Common Stock or
Convertible Securities, or in any rights or options to purchase any Common Stock
or Convertible Securities) payable in respect of such Common Stock or in respect
of any stock or securities paid as dividends or distributions and originating
directly or indirectly from such Common Stock. For the purposes of the
foregoing, a dividend or distribution other than in cash shall be considered
payable out of earnings or surplus only to the extent that such earnings or
surplus are charged an amount equal to the fair value of such dividend as
determined by the Board of Directors of the Company.

          (c)  In case the Company shall at any time subdivide its outstanding
shares of Common Stock into a greater number of shares, the warrant purchase
price in effect immediately prior to such subdivision shall be proportionately
reduced, and conversely, in case the outstanding shares of Common Stock of the
Company shall be combined into a smaller number of shares, the

                                      -2-

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warrant purchase price in effect immediately prior to such combination shall
be proportionately increased.

          (d) If any capital reorganization or reclassification of the capital
stock of the Company, or consolidation or merger of the Company with another
corporation, or the sale of all or substantially all of its assets to another
corporation shall be effected in such a way that holders of Common Stock shall
be entitled to receive stock, securities or assets with respect to or in
exchange for Common Stock, then, as a condition of such reorganization,
reclassification, consolidation, merger or sale, lawful and adequate provision
shall be made whereby the holder hereof shall thereafter have the right to
purchase and receive, upon the basis and upon the terms and conditions specified
in this Warrant and in lieu of the shares of the Common Stock of the Company
immediately theretofore purchasable and receivable upon the exercise of the
rights represented hereby, such shares of stock, securities or assets as may be
issued or payable with respect to or in exchange for a number of outstanding
shares of such Common Stock equal to the number of shares of such stock
immediately theretofore purchasable and receivable upon the exercise of the
rights represented hereby had such reorganization, reclassification,
consolidation, merger or sale not taken place.

          (e)  Upon any adjustment of the warrant purchase price, then and in
each such case the Company shall give written notice thereof, by first-class
mail, postage prepaid, addressed to the registered holder of this Warrant at the
address of such holder as shown on the books of the Company, which notice shall
state the warrant purchase price resulting from such adjustment and the increase
or decrease, if any, in the number of shares purchasable at such price upon the
exercise of this Warrant, setting forth in reasonable detail the method of
calculation and the facts upon which such calculation is based.

          (f)  In case any time:

               (1)  the Company shall declare any cash dividend on its capital
     stock at a rate in excess of the rate of the last cash dividend theretofore
     paid;

               (2)  the Company shall pay any dividend payable in stock upon its
     capital stock or make any distribution (other than regular cash dividends)
     to the holders of its capital stock;

               (3)  the Company shall offer for subscription pro rata to the
     holders of its capital stock any additional shares of stock of any class or
     other rights;

               (4)  there shall be any capital reorganization, or
     reclassification of the capital stock of the Company, or consolidation or
     merger of the Company with, or sale of all or substantially all of its
     assets to, another corporation; or

               (5)  there shall be a voluntary or involuntary dissolution,
     liquidation or winding up of the Company;

                                      -3-

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then, in any one or more of said cases, the Company shall give written notice,
by first-class mail, postage prepaid, addressed to the registered holder of this
Warrant at the address of such holder as shown on the books of the Company, of
the date on which (aa) the books of the Company shall close or a record shall be
taken for such dividend, distribution or subscription rights, or (bb) such
reorganization, reclassification, consolidation, merger, sale, dissolution,
liquidation or winding up, or conversion or redemption shall, or is expected to,
take place, as the case may be. Such notice shall also specify the date as of
which the holders of capital stock of record shall participate in such dividend,
distribution or subscription rights, or shall be entitled to exchange their
capital stock for securities or other property deliverable upon such
reorganization, reclassification, consolidation, merger, sale, dissolution,
liquidation or winding up, or conversion or redemption, as the case may be. Such
written notice shall be given at least 20 days prior to the action in question
and not less than 20 days prior to the record date or the date on which the
Company's transfer books are closed in respect thereto.

          (g)  No fractional shares of Common Stock shall be issued upon the
exercise of this Warrant, but, instead of any fraction of a share which would
otherwise be issuable, the Company shall pay a cash adjustment (which may be
effected as a reduction of the amount to be paid by the holder hereof upon such
exercise) in respect of such fraction in an amount equal to the same fraction of
the Market Price per share of Common Stock as of the close of business on the
date of the notice required by paragraph l above. "Market Price" shall mean, if
the Common Stock is traded on a securities exchange or on the NASDAQ National
Market System, the average of the closing prices of the Common Stock on such
exchange or the NASDAQ National Market System on the 20 trading days ending on
the trading day prior to the date of determination, or, if the Common Stock is
otherwise traded in the over-the-counter market, the average of the closing bid
prices on the 20 trading days ending on the trading day prior to the date of
determination. If at any time the Common Stock is not traded on an exchange or
the NASDAQ National Market System, or otherwise traded in the over-the-counter
market, the Market Price shall be deemed to be the higher of (i) the book value
thereof as determined by any firm of independent public accountants of
recognized standing selected by the Board of Directors of the Company as of the
last day of any month ending within 60 days preceding the date as of which the
determination is to be made, or (ii) the fair value thereof determined in good
faith by the Board of Directors of the Company as of a date which is within 15
days of the date as of which the determination is to be made.

          5.   This Warrant shall not entitle the holder hereof to any voting
rights or other rights as a stockholder of the Company.

          6.   The holder of this Warrant, by acceptance hereof, agrees that
this warrant may only be transferred to "accredited investors" (as defined in
Regulation D promulgated under the Securities Act of 1933, as amended) and to
give written notice to the Company before transferring this Warrant or
transferring any Common Stock issuable or issued upon the exercise hereof of
such holder's intention to do so, describing briefly the manner of any proposed
transfer of this Warrant or such holder's intention as to the disposition to be
made of shares of Common Stock issuable or issued upon the exercise hereof. Such
holder shall also provide the Company with an

                                      -4-

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opinion of counsel satisfactory to the Company to the effect that the proposed
transfer of this Warrant or disposition of shares may be effected without
registration or qualification (under any Federal or State law) of this Warrant
or the shares of Common Stock issuable or issued upon the exercise hereof. Upon
receipt of such written notice and opinion by the Company, such holder shall be
entitled to transfer this Warrant, or to exercise this Warrant in accordance
with its terms and dispose of the shares received upon such exercise or to
dispose of shares of Common Stock received upon the previous exercise of this
Warrant, all in accordance with the terms of the notice delivered by such holder
to the Company, provided that an appropriate legend respecting the aforesaid
restrictions on transfer and disposition may be endorsed on this Warrant or the
certificates for such shares.

          7.   Subject to the provisions of paragraph 6 hereof, this Warrant and
all rights hereunder are transferable, in whole or in part, at the principal
office of the Company by the holder hereof in person or by duly authorized
attorney, upon surrender of this Warrant properly endorsed. Each taker and
holder of this Warrant, by taking or holding the same, consents and agrees that
the bearer of this Warrant, when endorsed, may be treated by the Company and all
other persons dealing with this Warrant as the absolute owner hereof for any
purpose and as the person entitled to exercise the rights represented by this
Warrant, or to the transfer hereof on the books of the Company, any notice to
the contrary notwithstanding; but until such transfer on such books, the Company
may treat the registered holder hereof as the owner for all purposes.

          8.   This Warrant is exchangeable, upon the surrender hereof by the
holder hereof at the principal office of the Company, for new Warrants of like
tenor representing in the aggregate the right to subscribe for and purchase the
number of shares which may be subscribed for and purchased hereunder, each of
such new Warrants to represent the right to subscribe for and purchase such
number of shares as shall be designated by said holder hereof at the time of
such surrender.

          9.   The Company covenants and agrees that the Purchaser shall have
the rights granted under the Registration Rights Agreement dated December 19,
2001 by and between the Company and the Purchaser.

          10.  All questions concerning this Warrant will be governed and
interpreted and enforced in accordance with the internal law, not the law of
conflicts, of the State of Delaware.

                                      -5-

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          IN WITNESS WHEREOF, Aksys, Ltd. has caused this Warrant to be signed
by its duly authorized officer and this Warrant to be dated as of December 19,
2001.

                                                AKSYS, LTD.

                                                By:  /s/ William C. Dow
                                                Its:  President & CEO

                             RESTRICTION ON TRANSFER

          "The securities evidenced hereby may only be transferred only to an
"accredited investor" (as defined in Regulation D promulgated under the Federal
Securities Act of 1933) and may not be transferred without (i) the opinion of
counsel satisfactory to this corporation that such transfer may be lawfully made
without registration under the Federal Securities Act of 1933 and all applicable
state securities laws or (ii) such registration."

                                      -6-

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                                SUBSCRIPTION FORM

           To be Executed by the Holder of this Warrant if such Holder
              Desires to Exercise this Warrant in Whole or in Part:

To: Aksys, Ltd. (the "Company")

        The undersigned ___________________________________

                     Please insert Social Security or other
                        identifying number of Subscriber:

                         _______________________________

hereby irrevocably elects to exercise the right of purchase represented by this
Warrant for, and to purchase thereunder, _______________ shares of the Common
Stock (the "Common Stock") provided for therein and tenders payment herewith to
the order of the Company in the amount of $___________, such payment being made
as provided on the face of this Warrant.

          The undersigned requests that certificates for such shares of Common
Stock be issued as follows:

Name: __________________________________________________________________________

Address: _______________________________________________________________________

Deliver to: ____________________________________________________________________

Address: _______________________________________________________________________

and, if such number of shares of Common Stock shall not be all the shares of
Common Stock purchasable hereunder, that a new Warrant for the balance remaining
of the shares of Common Stock purchasable under this Warrant be registered in
the name of, and delivered to, the undersigned at the address stated above.

Dated:  ________________________

                               Signature _______________________________________

                                     Note: The signature on this Subscription
                                     Form must correspond with the name as
                                     written upon the face of this Warrant in
                                     every particular, without alteration or
                                     enlargement or any change whatever.

                                      -7-

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                               FORM OF ASSIGNMENT
                       (To Be Signed Only Upon Assignment)

          FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto

this Warrant, and appoints ______________________________________ to transfer
this Warrant on the books of the Company with the full power of substitution in
the premises.

Dated:_____________________________

In the presence of:________________

                                    ____________________________________________

                                    (Signature must conform in all respects to
                                    the name of the holder as specified on the
                                    face of this Warrant without alteration,
                                    enlargement or any change whatsoever, and
                                    the signature must be guaranteed in the
                                    usual manner)

                                      -8-<PAGE>

                                                                    Exhibit 10.4

                          REGISTRATION RIGHTS AGREEMENT

     This REGISTRATION RIGHTS AGREEMENT, dated as of December 19, 2001 (this
"Agreement"), is made by and among Aksys, Ltd., a Delaware corporation, with
 ---------
headquarters located at Two Marriott Drive, Lincolnshire, IL 60069 (the
"Company"), and the investors named on the signature pages hereto (the "Initial
 -------                                                                -------
Investors").
---------

                                    RECITALS:

     A. In connection with the Securities Purchase Agreement dated December 14,
2001 by and among the Initial Investors and the Company (the "Purchase
                                                              --------
Agreement"), the Company has agreed, upon the terms and subject to the
---------
conditions of the Purchase Agreement, to issue and sell to the Initial Investors
3,195,230 shares of the Company's Common Stock, par value $0.01 per share (the
"Common Shares") and to issue to the Initial Investors Warrants (the "Warrants")
 -------------                                                        --------
to purchase an aggregate of 584,728 shares of the Company's Common Stock, par
value $0.01 per share (the "Warrant Shares").
                            --------------

     B. In order to induce the Initial Investors to execute and deliver the
Purchase Agreement, the Company has agreed to provide certain registration
rights under the Securities Act and applicable state securities laws with
respect to the Common Shares and the Warrant Shares.

     In consideration of the premises and the mutual covenants contained herein
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the Company and the Initial Investors hereby agree as
follows:

                                    ARTICLE I

                                   DEFINITIONS

     Capitalized terms used and not otherwise defined herein have the respective
meanings given them in the Purchase Agreement. In addition, as used in this
Agreement, the following terms have the following meanings:

     1.1 "Investors" means the Initial Investors and any of their transferees or
          ---------
assignees who receive or acquire Registrable Securities and who are entitled to
the benefit of this Agreement as provided in Article IX hereof.

     1.2 "Registrable Securities" means the Common Shares sold pursuant to the
          ----------------------
Purchase Agreement, the Warrant Shares and any shares of capital stock issued or
issuable from time to time (with any adjustments) in exchange for or otherwise
with respect to the Common Shares or the Warrant Shares; provided that Common
Shares and Warrant Shares will cease to be Registrable Securities at such time
as they have been sold under a Registration Statement or pursuant to Rule 144.

                                       1

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     1.3 "Registration Period" means the period between the date of this
          -------------------
Agreement and the earliest of (i) the second anniversary of the date of this
Agreement, (ii) the date on which all of the Registrable Securities have been
sold by the Investors under the Registration Statement or pursuant to Rule 144
or (iii) the date on which all the Registrable Securities may be immediately
sold by the Investors without registration and without restriction as to the
number of Registrable Securities to be sold, pursuant to Rule 144 or otherwise.

     1.4 "Registration Statement" means a Registration Statement of the Company
          ----------------------
filed under the Securities Act.

     1.5 The terms "register," "registered," and "registration" refer to a
                    --------    ----------        ------------
registration effected by preparing and filing a Registration Statement or
statements in compliance with the Securities Act and pursuant to Rule 415 and
the declaration or ordering of effectiveness of such Registration Statement by
the SEC.

     1.6 "Rule 415" means Rule 415 under the Securities Act, or any successor
          --------
rule providing for offering securities on a continuous basis, and applicable
rules and regulations thereunder.

                                   ARTICLE II

                                  REGISTRATION

     2.1 Mandatory Registration. The Company will use its best efforts to file
         ----------------------
with the SEC a Registration Statement on Form S-3 registering only the
Registrable Securities for resale within 10 days after the Closing Date of the
purchase of the Common Shares and Warrants under the Purchase Agreement. If Form
S-3 is not available at that time, then the Company will use its best efforts to
file a Registration Statement on such form as is then available to effect a
registration of the Registrable Securities within such 10-day period.

     2.2 Effectiveness of the Registration Statement. The Company will use its
         -------------------------------------------
best efforts to cause the Registration Statement contemplated by the previous
Section to be declared effective by the SEC as soon as practicable after filing,
and in any event no later than the 30th day after the Closing Date (the
"Required Effective Date"). However, so long as the Company filed the
 -----------------------
Registration Statement within 10 days after the Closing Date, if the
Registration Statement receives any SEC review, then the Required Effective Date
will be the 100th day after the Closing Date. The Company's best efforts will
include, but are not be limited to, promptly responding to all comments received
from the staff of the SEC. If the Company receives notification from the SEC
that the Registration Statement will receive no action or review from the SEC,
then the Company will request that the Registration Statement become effective
within five business days after such SEC notification.

     2.3 Payments by the Company. If (i) at any time after effectiveness of the
         -----------------------
Registration Statement, sales cannot be made thereunder during the Registration
Period for any reason, other than by reason of the operation of Section 3.6, for
a period of more than 10 consecutive business days, or 30 business days in the
aggregate, during any 12-month period or (ii) the Common Stock is not listed or
included for quotation on Nasdaq, Nasdaq SmallCap, the NYSE or AMEX for more
than an aggregate of 10 business days in any 12-month period, then the Company
will thereafter make a

                                       2

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payment (by wire transfer or check) to each Investor as partial compensation for
such delay. The amount of the payment made to each Investor will be equal to 1%
of the purchase price paid for the Common Shares purchased by the Investor and
not previously sold by the Investor for each 30 business days that sales cannot
be made under the effective Registration Statement or the Common Stock is not
listed or included for quotation on Nasdaq, Nasdaq SmallCap, the NYSE or AMEX
(but in no event to exceed 12% in the aggregate) beyond the allowed period. The
number of shares not previously sold as specified in the previous sentence shall
be determined as of the end of the respective 30-day period. These payments will
be prorated on a daily basis during the 30 business day period and will be paid
to each Investor by check within five business days following the end of each
month as to which payment is due hereunder, assuming that the respective
Investor delivered to the Company at least 2 business days prior thereto
information with respect to the number of Common Shares not previously sold by
such Investor (together with reasonable supporting documentation).

     2.4  Effect of Late Registration. If the Registration Statement has not
          ---------------------------
been declared effective by the Required Effective Date, then the Company will
make a payment (by wire transfer or check) to each Investor as partial
compensation for such delay (the "Late Registration Payments"). The Late
                                  --------------------------
Registration Payments will be equal to 1% of the purchase price paid for the
Common Shares purchased by such Investor and not previously sold by such
Investor for each 30 business days after the Required Effective Date (but in no
event to exceed 12% in the aggregate). The Late Registration Payments will be
prorated on a daily basis during the 30 business day period and will be paid to
the Initial Investors by check within five business days after the earlier of
(i) the end of the 30 business days following the Required Effective Date or
(ii) the effective date of the Registration Statement.

     2.5  Piggyback Registrations.
          -----------------------

          (a) If, at any time prior to the expiration of the Registration
Period, a Registration Statement is not effective with respect to all of the
Registrable Securities and the Company decides to register any of its securities
for its own account or for the account of others, then the Company will promptly
give the Investors written notice thereof and will use its best efforts to
include in such registration all or any part of the Registrable Securities
requested by such Investors to be included therein (excluding any Registrable
Securities previously included in a Registration Statement). This requirement
does not apply to Company registrations on Form S-4 or S-8 or their equivalents
(relating to equity securities to be issued in connection with an acquisition of
any entity or business or equity securities issuable in connection with stock
option or other employee benefit plans) or to registration statements that would
otherwise not permit the registration of resales of previously issued
securities. Each Investor must give its request for registration under this
paragraph to the Company in writing within 15 days after receipt from the
Company of notice of such pending registration. If the registration for which
the Company gives notice is a public offering involving an underwriting, the
Company will so advise the Investors as part of the above described written
notice. In that event, if the managing underwriter(s) of the public offering
impose a limitation on the number of shares of Common Stock that may be included
in the Registration Statement because, in such underwriter(s)' judgment, such
limitation would be necessary to effect an orderly public distribution, then the
Company shall include in such registration (i) first, the securities the Company
proposes to sell, (ii) second, the securities desired to be sold pursuant to
such Registration Statement

                                       3

<PAGE>

by the stockholder or stockholders which are requiring the Company pursuant to a
contractual registration right to file such Registration Statement and (iii)
third, the Registrable Securities requested by the Investors to be included in
such offering, pro rata among the holders of such Registrable Securities on the
basis of the number of shares requested to be included by each such holder.

          (b) No right to registration of Registrable Securities under this
Section 2.5 limits in any way the registration required under Section 2.1 above.
The obligations of the Company under this Section 2.5 expire upon the earliest
of (i) the effectiveness of the Registration Statement filed pursuant to Section
2.1 above with respect to the Registrable Securities or the respective portion
thereof, (ii) after the Company has afforded the opportunity for the Investors
to exercise registration rights under this Section 2.5 for two registrations
(provided, however, that any Investor that has had any Registrable Securities
excluded from any Registration Statement in accordance with this Section 2.5 may
include in any additional Registration Statement filed by the Company the
Registrable Securities so excluded), or (iii) expiration of the Registration
Period.

     2.6 Eligibility to use Form S-3. The Company represents and warrants that,
         ---------------------------
as of the date of this Agreement, it meets the requirements for the use of Form
S-3 for registration of the resale by the Investors of the Registrable
Securities.

                                   ARTICLE III

                      ADDITIONAL OBLIGATIONS OF THE COMPANY

     3.1 Continued Effectiveness of Registration Statement. Subject to the
         -------------------------------------------------
limitations set forth in Section 3.6, the Company will use its best efforts to
keep the Registration Statement covering the Registrable Securities effective
under Rule 415 at all times during the Registration Period. In the event that
the number of shares available under a Registration Statement filed pursuant to
this Agreement is insufficient to cover all of the Registrable Securities issued
under the Purchase Agreement or issued or issuable upon exercise of (or
otherwise pursuant to) the Warrants, the Company will (if permitted) amend the
Registration Statement or file a new Registration Statement (on the short form
available therefor, if applicable), or both, so as to cover all of the
Registrable Securities. The Company will file such amendment or new Registration
Statement as soon as practicable, but in no event later than 20 business days
after the necessity therefor arises. The Company will use its best efforts to
cause such amendment or new Registration Statement to become effective as soon
as is practicable after the filing thereof.

     3.2 Accuracy of Registration Statement. Assuming the accuracy of
         ----------------------------------
information furnished by or on behalf of the Investors, any Registration
Statement (including any amendments or supplements thereto and prospectuses
contained therein) filed by the Company covering Registrable Securities will not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein, or necessary to make the statements therein, in
light of the circumstances in which they were made, not misleading. The Company
will promptly prepare and file with the SEC such amendments (including
post-effective amendments) and supplements to the Registration Statement and the
prospectus used in connection with the Registration Statement as may be
necessary to permit sales pursuant to the Registration Statement at all times
during the Registration Period (but subject to Section 3.6), and, during such
period, will comply with the

                                       4

<PAGE>

provisions of the Securities Act with respect to the disposition of all
Registrable Securities of the Company covered by the Registration Statement
until the termination of the Registration Period, or if earlier, until such time
as all of such Registrable Securities have been disposed of in accordance with
the intended methods of disposition by the seller or sellers thereof as set
forth in the Registration Statement.

     3.3  Furnishing Documentation. The Company will furnish to each Investor
          ------------------------
whose Registrable Securities are included in a Registration Statement, or to its
legal counsel, (a) promptly after each document is filed with the SEC, one copy
of any Registration Statement filed pursuant to this Agreement and any
amendments thereto, each preliminary prospectus (if any) and final prospectus
and each amendment or supplement thereto; and (b) a number of copies of a
prospectus, including a preliminary prospectus (if any), and all amendments and
supplements thereto, and such other documents as the Investor may reasonably
request in order to facilitate the disposition of the Registrable Securities
owned by the Investor. The Company will promptly notify by facsimile each
Investor whose Registrable Securities are included in any Registration Statement
of the effectiveness of the Registration Statement and any post-effective
amendment.

     3.4  Additional Obligations. The Company will use its best efforts to (a)
          ----------------------
register and qualify the Registrable Securities covered by a Registration
Statement under such other securities or blue sky laws of such jurisdictions as
each Investor who holds (or has the right to hold) Registrable Securities being
offered reasonably requests, (b) prepare and file in those jurisdictions any
amendments (including post-effective amendments) and supplements to such
registrations and qualifications as may be necessary to maintain their
effectiveness during the Registration Period, (c) take any other actions
necessary to maintain such registrations and qualifications in effect at all
times during the Registration Period, and (d) take any other actions reasonably
necessary or advisable to qualify the Registrable Securities for sale in such
jurisdictions. Notwithstanding the foregoing, the Company is not required, in
connection with such obligations, to (i) qualify to do business in any
jurisdiction where it would not otherwise be required to qualify but for this
Section 3.4, (ii) subject itself to general taxation in any such jurisdiction,
(iii) file a general consent to service of process in any such jurisdiction,
(iv) provide any undertakings that cause material expense or burden to the
Company, or (v) make any change in its charter or bylaws, which in each case the
Company determines to be contrary to the best interests of the Company and its
stockholders.

     3.5  Underwritten Offerings. If the Investors who hold a majority in
          ----------------------
interest of the Registrable Securities being offered in an offering pursuant to
a Registration Statement or any amendment or supplement thereto under this
Agreement select underwriters reasonably acceptable to the Company for such
offering, the Company will enter into and perform its obligations under an
underwriting agreement in usual and customary form including, without
limitation, customary indemnification and contribution obligations, with the
managing underwriter of such offering.

     3.6  Suspension of Resale Rights.
          ---------------------------

          (a) The Company will notify (by telephone and also by facsimile and
reputable overnight courier) each Investor who holds Registrable Securities
being sold pursuant to a Registration Statement of the happening of any event of
which the Company has knowledge as a result of which the prospectus included in
the Registration Statement as then in effect includes an

                                       5

<PAGE>

untrue statement of a material fact or omits to state a material fact required
to be stated therein or necessary to make the statements therein, in light of
the circumstances under which they were made, not misleading. The Company will
make such notification as promptly as practicable after the Company becomes
aware of the event (but in no event will the Company disclose to any Investor
any of the facts or circumstances regarding the event), will promptly prepare a
supplement or amendment to the Registration Statement to correct such untrue
statement or omission, and will deliver a number of copies of such supplement or
amendment to each Investor as such Investor may reasonably request.

          (b) Notwithstanding the obligations under Section 3.6(a), if in the
good faith judgment of the Company, following consultation with legal counsel,
it would be detrimental to the Company and its stockholders for resales of
Registrable Securities to be made pursuant to the Registration Statement due to
(i) the existence of a material development or potential material development
involving the Company which the Company would be obligated to disclose in the
Registration Statement, which disclosure would be premature or otherwise
inadvisable at such time or would have a Material Adverse Effect upon the
Company and its stockholders, or (ii) in the good faith judgment of the Company,
it would adversely affect or require premature disclosure of the filing of a
Company-initiated registration of any class of its equity securities, the
Company will have the right to suspend the use of the Registration Statement for
a period of not more than ninety days, provided, however, that the Company will
                                       --------  -------
use its commercially reasonable efforts to keep the length of any such
suspension to as short a period as is practicable given the then existing
circumstances and may so defer or suspend the use of the Registration Statement
no more than two times in any eighteen-month period, and provided, further,
                                                         --------  -------
that, after deferring or suspending the use of the Registration Statement, the
Company may not again defer or suspend the use of the Registration Statement
until a period of thirty days has elapsed after resumption of the use of the
Registration Statement.

          (c) Subject to the Company's rights under this Section 3, the Company
will use its best efforts to prevent the issuance of any stop order or other
suspension of effectiveness of a Registration Statement and, if such an order is
issued, will use its best efforts to obtain the withdrawal of such order at the
earliest possible time and the Company will promptly notify each Investor that
holds Registrable Securities being sold (or, in the event of an underwritten
offering, the managing underwriters) of the issuance of such order and the
resolution thereof.

          (d) Notwithstanding anything to the contrary contained herein or in
the Purchase Agreement, if the use of the Registration Statement is suspended by
the Company, the Company will promptly give notice of the suspension to all
Investors whose securities are covered by the Registration Statement, and will
promptly notify each such Investor as soon as the use of the Registration
Statement may be resumed.

     3.7  Review by the Investors. The Company will permit a single firm of
          -----------------------
legal counsel, designated by the Investors who hold a majority in interest of
the Registrable Securities being sold pursuant to a Registration Statement, to
review the Registration Statement and all amendments and supplements thereto (as
well as all requests for acceleration or effectiveness thereof) a reasonable
period of time prior to their filing with the SEC, and will not file any
document in a form to which such counsel reasonably objects, unless otherwise
required by law in the opinion of the Company's

                                       6

<PAGE>

counsel; provided that the time periods set forth in Section 2.2 shall be tolled
to the extent that such legal counsel does not deliver its final comments
relating to such Registration Statement to the Company within 3 business days
after receipt of such Registration Statement. The sections of any such
Registration Statement including information with respect to the Investors, the
Investors' beneficial ownership of securities of the Company or the Investors'
intended method of disposition of Registrable Securities must conform to the
information provided to the Company by each of the Investors.

     3.8  Comfort Letter; Legal Opinion. At the request of the Investors who
          -----------------------------
hold a majority in interest of the Registrable Securities being sold pursuant to
a Registration Statement, and on the date that Registrable Securities are
delivered to an underwriter for sale in connection with the Registration
Statement, the Company will furnish to the Investors and the underwriters (i) a
letter, dated such date, from the Company's independent certified public
accountants, in form and substance as is customarily given by independent
certified public accountants to underwriters in an underwritten public offering,
addressed to the underwriters; and (ii) an opinion, dated such date, from
counsel representing the Company for purposes of the Registration Statement, in
form and substance as is customarily given in an underwritten public offering,
addressed to the underwriters and Investors.

     3.9  Due Diligence; Confidentiality.
          ------------------------------

          (a) The Company will make available upon reasonable advance notice
during normal business hours for inspection by any Investor whose Registrable
Securities are being sold pursuant to a Registration Statement, any underwriter
participating in any disposition pursuant to the Registration Statement, and any
attorney, accountant or other agent retained by any such Investor or underwriter
(collectively, the "Inspectors"), all pertinent financial and other records,
                    ----------
pertinent corporate documents and properties of the Company (collectively, the
"Records"), as reasonably necessary to enable the Inspector to exercise its due
 -------
diligence responsibility in connection with or related to the contemplated
offering. The Company will cause its officers, directors and employees to supply
all information that any Inspector may reasonably request for purposes of
performing such due diligence.

          (b) Each Inspector will hold in confidence, use only in connection
with the contemplated offering, and will not make any disclosure (except to an
Investor) of, all Records and other information that the Company determines in
good faith to be confidential, and of which determination the Inspectors are so
notified, unless (i) the disclosure of such Records is necessary to avoid or
correct a misstatement or omission in any Registration Statement, (ii) the
release of such Records is ordered pursuant to a subpoena or other order from a
court or government body of competent jurisdiction, (iii) the information in
such Records has been made generally available to the public other than by
disclosure in violation of this or any other agreement (to the knowledge of the
relevant Inspector), (iv) the Records or other information was developed
independently by an Inspector without breach of this Agreement, (v) the
information was known to the Inspector before receipt of such information from
the Company, or (vi) the information was disclosed to the Inspector by a third
party not under an obligation of confidentiality. The Company is not required to
disclose any confidential information in the Records to any Inspector unless and
until such Inspector has entered into a confidentiality agreement (in form and
substance satisfactory to the Company) with the Company with respect thereto,
substantially in the form of this Section 3.9. Each Investor will, upon

                                       7

<PAGE>

learning that disclosure of Records containing confidential information is
sought in or by a court or governmental body of competent jurisdiction or
through other means, give prompt notice to the Company and allow the Company, at
the Company's expense, to undertake appropriate action to prevent disclosure of,
or to obtain a protective order for, the Records deemed confidential. Nothing
herein will be deemed to limit the Investor's ability to sell Registrable
Securities in a manner that is otherwise consistent with applicable laws and
regulations.

          (c) The Company will hold in confidence, and will not make any
disclosure of, information concerning an Investor provided to the Company under
this Agreement unless (i) disclosure of such information is necessary to comply
with federal or state securities laws, or any exchange listing or similar rules
and regulations, (ii) the disclosure of such information is necessary to avoid
or correct a misstatement or omission in any Registration Statement, (iii) the
release of such information is ordered pursuant to a subpoena or other order
from a court or governmental body of competent jurisdiction, (iv) such
information has been made generally available to the public other than by
disclosure in violation of this Agreement or any other agreement, (v) the
information was disclosed to the Company by a third party not under an
obligation of confidentiality or (vi) such Investor consents to the form and
content of any such disclosure. If the Company learns that disclosure of such
information concerning an Investor is sought in or by a court or governmental
body of competent jurisdiction or through other means, the Company will give
prompt notice to such Investor prior to making such disclosure and allow such
Investor, at its expense, to undertake appropriate action to prevent disclosure
of, or to obtain a protective order for, such information.

     3.10 Listing. The Company will use best efforts to (i) cause all of the
          -------
Registrable Securities covered by each Registration Statement to be listed on
each national securities exchange on which securities of the same class or
series issued by the Company are then listed, if any, if the listing of such
Registrable Securities is then permitted under the rules of such exchange, or
(ii) to the extent the securities of the same class or series are not then
listed on a national securities exchange, secure the designation and quotation
of all of the Registrable Securities covered by each Registration Statement on
Nasdaq.

     3.11 Share Certificates. The Company will cooperate with the Investors who
          ------------------
hold Registrable Securities being sold and with the managing underwriter(s), if
any, to facilitate the timely preparation and delivery of certificates (not
bearing any restrictive legends) representing Registrable Securities to be
offered pursuant to a Registration Statement and will enable such certificates
to be in such denominations or amounts as the case may be, and registered in
such names as the Investors or the managing underwriter(s), if any, may
reasonably request, all in accordance with Article V of the Purchase Agreement.

     3.12 Plan of Distribution. At the request of the Investors holding a
          --------------------
majority in interest of the Registrable Securities registered pursuant to a
Registration Statement, the Company will promptly prepare and file with the SEC
such amendments (including post-effective amendments) and supplements to the
Registration Statement, and the prospectus used in connection with the
Registration Statement, as may be necessary in order to change the plan of
distribution set forth in such Registration Statement.

                                       8

<PAGE>

     3.13 Securities Laws Compliance. The Company will comply with all
          --------------------------
applicable laws related to any Registration Statement relating to the sale of
Registrable Securities and to offering and sale of securities and with all
applicable rules and regulations of governmental authorities in connection
therewith (including, without limitation, the Securities Act, the Exchange Act
and the rules and regulations promulgated by the SEC).

     3.14 Further Assurances. The Company will take all other reasonable actions
          ------------------
as any Investor or the underwriters, if any, may reasonably request to expedite
and facilitate disposition by such Investor of the Registrable Securities
pursuant to the Registration Statement.

     3.15 No Additional Selling Shareholders. Other than the holders of
          ----------------------------------
securities covered by the Original Registration Rights Agreement (as defined in
the Purchase Agreement) and the Second Private Placement Registration Rights
Agreement (as defined in the Purchase Agreement), the Company will not, and will
not agree to, allow the holders of any securities of the Company to include any
of their securities in any Registration Statement under Section 2.1 hereof, or
any amendment or supplement thereto under Section 3.2 hereof, without the
consent of the holders of a majority in interest of the Registrable Securities.

                                   ARTICLE IV

                          OBLIGATIONS OF THE INVESTORS

     4.1 Investor Information. As a condition to the obligations of the Company
         --------------------
to complete any registration pursuant to this Agreement with respect to the
Registrable Securities of each Investor, such Investor will furnish to the
Company such information regarding itself, the Registrable Securities held by it
and the intended method of disposition of the Registrable Securities held by it
as is reasonably required by the Company to effect the registration of the
Registrable Securities. At least 10 business days prior to the first anticipated
filing date of a Registration Statement for any registration under this
Agreement, the Company will notify each Investor of the information the Company
requires from that Investor if the Investor elects to have any of its
Registrable Securities included in the Registration Statement. If, within three
business days prior to the filing date, the Company has not received the
requested information from an Investor, then the Company may file the
Registration Statement without including Registrable Securities of that
Investor.

     4.2 Further Assurances. Each Investor will cooperate with the Company, as
         ------------------
reasonably requested by the Company, in connection with the preparation and
filing of any Registration Statement hereunder, unless such Investor has
notified the Company in writing of such Investor's irrevocable election to
exclude all of such Investor's Registrable Securities from such Registration
Statement.

     4.3 Suspension of Sales. Upon receipt of any notice from the Company under
         -------------------
Section 3.6, each Investor will immediately discontinue disposition of
Registrable Securities pursuant to the Registration Statement covering such
Registrable Securities until (i) it receives copies of a supplemented or amended
prospectus contemplated by Section 3.6(a) or (ii) the Company advises the
Investor that a suspension of sales under Section 3.6(b) has terminated. If so
directed by the Company, each Investor will deliver to the Company (at the
expense of the Company) or destroy (and deliver to the Company a certificate of
destruction) all copies in the Investor's possession (other

                                       9

<PAGE>

than a limited number of file copies) of the prospectus covering such
Registrable Securities that is current at the time of receipt of such notice.

     4.4  Underwritten Offerings.
          ----------------------

          (a) If Investors holding a majority in interest of the Registrable
Securities being registered (with the approval of a majority in interest of the
Initial Investors) determine to engage the services of an underwriter, each
Investor will enter into and perform such Investor's obligations under an
underwriting agreement, in usual and customary form, including, without
limitation, customary indemnification and contribution obligations, with the
managing underwriter of such offering, and will take such other actions as are
reasonably required in order to expedite or facilitate the disposition of the
Registrable Securities, unless such Investor has notified the Company in writing
of such Investor's election to exclude all of its Registrable Securities from
such Registration Statement.

          (b) Without limiting any Investor's rights under Section 2.1 hereof,
no Investor may participate in any underwritten distribution hereunder unless
such Investor (a) agrees to sell such Investor's Registrable Securities on the
basis provided in any underwriting arrangements approved by the Investors
entitled hereunder to approve such arrangements, (b) completes and executes all
questionnaires, powers of attorney, indemnities, underwriting agreements and
other documents reasonably required under the terms of such underwriting
arrangements, and (c) agrees to pay its pro rata share of all underwriting
discounts and commissions and other fees and expenses of investment bankers and
any manager or managers of such underwriting, and legal expenses of the
underwriter, applicable with respect to its Registrable Securities, in each case
to the extent not payable by the Company under the terms of this Agreement.

                                    ARTICLE V

                            EXPENSES OF REGISTRATION

     The Company will bear all reasonable expenses, other than underwriting
discounts and commissions, and transfer taxes, if any, incurred in connection
with registrations, filings or qualifications pursuant to Articles II and III of
this Agreement, including, without limitation, all registration, listing and
qualifications fees, printers and accounting fees, the fees and disbursements of
counsel for the Company, and the reasonable fees and disbursements of one firm
of legal counsel selected by the Initial Investors pursuant to Section 3.7
hereof (not to exceed $5,000). The Investors shall reimburse the Company for any
out-of-pocket expenses the Company incurs in an underwritten offering initiated
by the Investors.

                                   ARTICLE VI

                                 INDEMNIFICATION

     In the event that any Registrable Securities are included in a Registration
Statement under this Agreement:

     6.1  To the extent permitted by law, the Company will indemnify and hold
harmless each Investor that holds such Registrable Securities, any underwriter
(as defined in the Securities Act) for

                                       10

<PAGE>

the Investors, any directors or officers of such Investor or such underwriter
and any person who controls such Investor or such underwriter within the meaning
of the Securities Act or the Exchange Act (each, an "Indemnified Person")
                                                     ------------------
against any losses, claims, damages, expenses or liabilities (joint or several)
(collectively, and together with actions, proceedings or inquiries by any
regulatory or self-regulatory organization, whether commenced or threatened in
respect thereof, "Claims") to which any of them become subject under the
Securities Act, the Exchange Act or otherwise, insofar as such Claims arise out
of or are based upon any of the following statements, omissions or violations in
a Registration Statement filed pursuant to this Agreement, any post-effective
amendment thereof or any prospectus included therein: (a) any untrue statement
or alleged untrue statement of a material fact contained in the Registration
Statement or any post-effective amendment thereof or the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, (b) any untrue
statement or alleged untrue statement of a material fact contained in the
prospectus related to the Registration Statement (as it may be amended or
supplemented) or the omission or alleged omission to state therein any material
fact necessary to make the statements made therein, in light of the
circumstances under which the statements therein were made, not misleading, or
(c) any violation or alleged violation by the Company of the Securities Act, the
Exchange Act or any other law related to the Registration Statement, including
without limitation any state securities law or any rule or regulation thereunder
(the matters in the foregoing clauses (a) through (c) being, collectively,
"Violations"). Subject to the restrictions set forth in Section 6.3 with respect
 ----------
to the number of legal counsel, the Company will reimburse the Investors and
each such underwriter or controlling person and each such other Indemnified
Person, promptly as such expenses are incurred and are due and payable, for any
legal fees or other reasonable expenses incurred by them in connection with
investigating or defending any Claim. Notwithstanding anything to the contrary
contained herein, the indemnification agreement contained in this Section 6.1:
(i) does not apply to Claims arising out of or based upon a Violation that
occurs in reliance upon and in conformity with information furnished in writing
to the Company by an Indemnified Person expressly for use in connection with the
preparation of the Registration Statement or any such amendment thereof or
supplement thereto, if such prospectus was timely made available by the Company
pursuant to Section 3.3 hereof; (ii) does not apply to a Claim arising out of or
based on any failure by any Indemnified Person to comply with prospectus
delivery requirements (or the Securities Act, the Exchange Act or any other law
or legal requirement applicable to them) or any covenant or agreement contained
in the Purchase Agreement or this Agreement; and (iii) does not apply to amounts
paid in settlement of any Claim if such settlement is made without the prior
written consent of the Company, which consent will not be unreasonably withheld.
This indemnity obligation will remain in full force and effect regardless of any
investigation made by or on behalf of the Indemnified Persons and will survive
the transfer of the Registrable Securities by the Investors under Article IX of
this Agreement.

     6.2  In connection with any Registration Statement in which an Investor is
participating, each such Investor will indemnify and hold harmless, severally
and not jointly, to the same extent and in the same manner set forth in Section
6.1 above, the Company, each of its directors, each of its officers who signs
the Registration Statement, each person, if any, who controls the Company within
the meaning of the Securities Act or the Exchange Act, and any other stockholder
selling securities pursuant to the Registration Statement and any of its
directors and officers and any person who controls such stockholder within the
meaning of the Securities Act or the Exchange Act (each an

                                       11

<PAGE>

"Indemnified Person") against any Claim to which any of them may become subject
 ------------------
under the Securities Act, the Exchange Act or otherwise, insofar as such Claim
arises out of or is based upon any of the following: (a) any matter of the type
referred to clause (a) or (b) in Section 6.1 above in each case to the extent
(and only to the extent) that such violation occurs in reliance upon and in
conformity with written information furnished to the Company by such Investor
expressly for use in connection with such Registration Statement or (b) any
failure by such Investor to comply with prospectus delivery requirements (or the
Securities Act, the Exchange Act or any other law or legal requirement
applicable to sales under the Registration Statement) or any covenant or
agreement contained in the Purchase Agreement or this Agreement with respect to
sales under the Registration Statement. Subject to the restrictions set forth in
Section 6.3, such Investor will promptly reimburse any legal or other expenses
(promptly as such expenses are incurred and due and payable) reasonably incurred
by them in connection with investigating or defending any such Claim. However,
the indemnity agreement contained in this Section 6.2 does not apply to amounts
paid in settlement of any Claim if such settlement is effected without the prior
written consent of such Investor, which consent will not be unreasonably
withheld, and no Investor will be liable under this Agreement (including this
Section 6.2 and Article VII) for the amount of any Claim that exceeds the net
proceeds actually received by such Investor as a result of the sale of
Registrable Securities pursuant to such Registration Statement. This indemnity
will remain in full force and effect regardless of any investigation made by or
on behalf of an Indemnified Party and will survive the transfer of the
Registrable Securities by the Investors under Article IX of this Agreement.

     6.3  Promptly after receipt by an Indemnified Person under this Article VI
of notice of the commencement of any action (including any governmental action),
such Indemnified Person will, if a Claim in respect thereof is to be made
against any indemnifying party under this Article VI, deliver to the
indemnifying party a written notice of the commencement thereof. The
indemnifying party may participate in, and, to the extent the indemnifying party
so desires, jointly with any other indemnifying party similarly given notice,
assume control of the defense thereof with counsel mutually satisfactory to the
indemnifying parties and the Indemnified Person. In that case, the indemnifying
party will diligently pursue such defense. If, in the reasonable opinion of
counsel retained by the indemnifying party, the representation by such counsel
of the Indemnified Person and the indemnifying party would be inappropriate due
to actual or potential conflicts of interest between the Indemnified Person and
any other party represented by such counsel in such proceeding or the actual or
potential defendants in, or targets of, any such action including the
Indemnified Person and such Indemnified Person reasonably determines that there
may be legal defenses available to such Indemnified Person that are different
from or in addition to those available to the indemnifying party, then the
Indemnified Person is entitled to assume such defense and may retain its own
counsel, with the fees and expenses to be paid by the indemnifying party
(subject to the restrictions on settlement under Section 6.1 or 6.2, as
applicable). The Company will pay for only one separate legal counsel for the
Investors collectively, and such legal counsel will be selected by the Investors
holding a majority in interest of the Registrable Securities. The failure to
deliver written notice to the indemnifying party within a reasonable time of the
commencement of any such action does not relieve an indemnifying party of any
liability to an Indemnified Person under this Article VI, except to the extent
that the indemnifying party is prejudiced in its ability to defend such action.
The indemnification required by this Article VI will be made by periodic
payments of the amount thereof

                                       12

<PAGE>

during the course of the investigation or defense, as such expense, loss, damage
or liability is incurred and is due and payable.

                                   ARTICLE VII

                                  CONTRIBUTION

     To the extent that any indemnification provided for herein is prohibited or
limited by law, the indemnifying party will make the maximum contribution with
respect to any amounts for which it would otherwise be liable under Article VI
to the fullest extent permitted by law. However, (a) no contribution will be
made under circumstances where the maker would not have been liable for
indemnification under the fault standards set forth in Article VI, (b) no seller
of Registrable Securities guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) will be entitled to contribution
from any seller of Registrable Securities who was not guilty of such fraudulent
misrepresentation, and (c) contribution (together with any indemnification or
other obligations under this Agreement) by any seller of Registrable Securities
will be limited in amount to the net amount of proceeds received by such seller
from the sale of such Registrable Securities.

                                  ARTICLE VIII

                             EXCHANGE ACT REPORTING

     In order to make available to the Investors the benefits of Rule 144 or any
similar rule or regulation of the SEC that may at any time permit the Investors
to sell securities of the Company to the public without registration, the
Company will, until the end of the Registration Period:

          (a) File with the SEC in a timely manner, and make and keep available,
all reports and other documents required of the Company under the Securities Act
and the Exchange Act so long as the Company remains subject to such requirements
(it being understood that nothing herein limits the Company's obligations under
Section 4.3 of the Purchase Agreement) and the filing and availability of such
reports and other documents is required for the applicable provisions of Rule
144; and

          (b) Furnish to each Investor, so long as such Investor holds Warrants
or Registrable Securities, promptly upon the Investor's request, (i) a written
statement by the Company that it has complied with the reporting requirements of
the Securities Act and the Exchange Act, (ii) a copy of the most recent annual
or quarterly report of the Company and such other reports and documents filed by
the Company with the SEC and (iii) such other information as may be reasonably
requested to permit the Investors to sell such securities pursuant to Rule 144
without registration.

                                   ARTICLE IX

                        ASSIGNMENT OF REGISTRATION RIGHTS

     The rights of the Investors hereunder, including the right to have the
Company register Registrable Securities pursuant to this Agreement, will be
automatically assigned by the Investors to transferees or assignees of all or
any portion of the Warrants or Registrable Securities, but only if

                                       13

<PAGE>

(a) the Investor agrees in writing with the transferee or assignee to assign
such rights, and a copy of such agreement is furnished to the Company within a
reasonable time after such assignment, (b) the Company is, within a reasonable
time after such transfer or assignment, furnished with written notice of the
name and address of such transferee or assignee and the securities with respect
to which such registration rights are being transferred or assigned, (c) such
transfer or assignment was not made under the Registration Statement or Rule
144, (d) at or before the time the Company received the written notice
contemplated by clause (b) of this sentence, the transferee or assignee agrees
in writing with the Company to be bound by all of the provisions contained
herein, (e) such transfer is made in accordance with the applicable requirements
of the Purchase Agreement or the Warrant, as the case may be, and (f) the
transferee is an "accredited investor" as that term is defined in Rule 501 of
Regulation D. Any transferee or assignee of an Investor under Article IX shall
be deemed an "Investor" for all purposes of this Agreement, and shall be
entitled to all rights of, and subject to all obligations (including
indemnification obligations) of, an Investor hereunder.

                                    ARTICLE X

                        AMENDMENT OF REGISTRATION RIGHTS

     This Agreement may be amended and the obligations hereunder may be waived
(either generally or in a particular instance, and either retroactively or
prospectively) only with the written consent of the Company and of the Investors
who then hold a majority in interest of the Registrable Securities (but not
including any Investor who is not affected by such amendment or waiver). Any
amendment or waiver effected in accordance with this Article X is binding upon
each Investor and the Company. Notwithstanding the foregoing, no amendment or
waiver will retroactively affect any Investor without its consent, or will
prospectively adversely affect any Investor who no longer owns any Warrants or
Registrable Securities without its consent. Neither Article VI nor Article VII
hereof may be amended or waived in a manner adverse to an Investor without its
consent.

                                   ARTICLE XI

                                  MISCELLANEOUS

     11.1 Conflicting Instructions. A person or entity is deemed to be a holder
          ------------------------
of Registrable Securities whenever such person or entity owns of record such
Registrable Securities. If the Company receives conflicting instructions,
notices or elections from two or more persons or entities with respect to the
same Registrable Securities, the Company will act upon the basis of
instructions, notice or election received from the registered owner of such
Registrable Securities.

     11.2 Notices. Any notices required or permitted to be given under the terms
          -------
of this Agreement will be given and deemed received as set forth in the Purchase
Agreement.

     11.3 Waiver. Failure of any party to exercise any right or remedy under
          ------
this Agreement or otherwise, or delay by a party in exercising such right or
remedy, does not operate as a waiver thereof.

     11.4 Governing Law. This Agreement will be governed by and interpreted in
          -------------
accordance with the laws of the State of Illinois without regard to the
principles of conflict of laws. The parties

                                       14

<PAGE>

hereto hereby submit to the exclusive jurisdiction of the United States federal
and state courts located in the State of Illinois with respect to any dispute
arising under this Agreement, the agreements entered into in connection herewith
or the transactions contemplated hereby or thereby.

     11.5  Severability. If any provision of this Agreement is invalid or
           ------------
unenforceable under any applicable statute or rule of law, then such provision
will be deemed modified in order to conform with such statute or rule of law.
Any provision hereof that may prove invalid or unenforceable under any law will
not affect the validity or enforceability of any other provision hereof.

     11.6  Entire Agreement. This Agreement, the Purchase Agreement and the
           ----------------
Warrants (including all schedules and exhibits thereto) constitute the entire
agreement among the parties hereto with respect to the subject matter hereof and
thereof. There are no restrictions, promises, warranties or undertakings, other
than those set forth or referred to herein or therein. This Agreement supersedes
all prior agreements and understandings among the parties hereto with respect to
the subject matter hereof.

     11.7  Successors and Assigns. Subject to the requirements of Article IX
           ----------------------
hereof, this Agreement inures to the benefit of and is binding upon the
successors and assigns of each of the parties hereto. Notwithstanding anything
to the contrary herein, including, without limitation, Article IX, the rights of
an Investor hereunder are assignable to and exercisable by a bona fide pledgee
of the Registrable Securities in connection with an Investor's margin or
brokerage accounts.

     11.8  Use of Pronouns. All pronouns refer to the masculine, feminine or
           ---------------
neuter, singular or plural, as the context may require.

     11.9  Headings. The headings of this Agreement are for convenience of
           --------
reference only, are not part of this Agreement and do not affect its
interpretation.

     11.10 Counterparts. This Agreement may be executed in two or more
           ------------
counterparts, each of which is deemed an original but all of which constitute
one and the same agreement. This Agreement, once executed by a party, may be
delivered to the other party hereto by facsimile transmission, and facsimile
signatures are binding on the parties hereto.

     11.11 Further Assurances. Each party will do and perform, or cause to be
           ------------------
done and performed, all such further acts and things, and will execute and
deliver all other agreements, certificates, instruments and documents, as
another party may reasonably request in order to carry out the intent and
accomplish the purposes of this Agreement and the consummation of the
transactions contemplated hereby.

     11.12 Consents. All consents and other determinations to be made by the
           --------
Investors pursuant to this Agreement will be made by the Initial Investors or
the Investors holding a majority in interest of the Registrable Securities,
determined as if all Warrants then outstanding had been exercised for
Registrable Securities.

     11.13 No Strict Construction. The language used in this Agreement is deemed
           ----------------------
to be the language chosen by the parties to express their mutual intent, and no
rules of strict construction will be applied against any party.

                                       15

<PAGE>

                                     * * * *

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        COMPANY:

                                        AKSYS, LTD.

                                        By: /s/ William C. Dow
                                            ------------------------------------
                                            Name:  William C. Dow
                                                   -----------------------------
                                            Title: President and CEO
                                                   -----------------------------

                                       16

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                              INVESTORS:

                              Durus Life Sciences Master Fund Ltd.
                              --------------------------------------------------
                              [PRINT NAME OF INVESTOR]

                              By: /s/ Susan Byrne
                                  ----------------------------------------------
                                  Name:  Susan Byrne
                                         ---------------------------------------
                                  Title: for and behalf of European Fund
                                         ---------------------------------------
                                         (Services) Ltd., Director
                                         ---------------------------------------

                              __________________________________________________
                              [PRINT NAME OF INVESTOR]

                              By: ______________________________________________
                                  Name:  _______________________________________
                                  Title: _______________________________________

                              __________________________________________________
                              [PRINT NAME OF INVESTOR]

                              By: ______________________________________________
                                  Name:  _______________________________________
                                  Title: _______________________________________

                                       17

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        INVESTORS:

                                        Domain Public Equity Partners, L.P.
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Nicole Vitello
                                            ------------------------------------
                                            Name:  Nicole Vitello
                                                   -----------------------------
                                            Title: Managing Member
                                                   -----------------------------

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                       18

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                         INVESTORS:

                                         Steelhead Investment, Ltd.
                                         ---------------------------------------
                                         [PRINT NAME OF INVESTOR]

                                         By: /s/ Kevin O'Neal
                                             -----------------------------------
                                             Name:  Kevin O'Neal
                                                    ----------------------------
                                             Title: Authorized Signatory
                                                    ----------------------------

                                         _______________________________________
                                         [PRINT NAME OF INVESTOR]

                                         By: ___________________________________
                                             Name:  ____________________________
                                             Title: ____________________________

                                         _______________________________________
                                         [PRINT NAME OF INVESTOR]

                                         By: ___________________________________
                                             Name:  ____________________________
                                             Title: ____________________________

                                       19

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        INVESTORS:

                                        OTATO L.P.
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Richard N. Cayne
                                            ------------------------------------
                                            Name:  Richard N. Cayne
                                                   -----------------------------
                                            Title: General Counsel, Authorized
                                                   -----------------------------
                                                   Signatory
                                                   -----------------------------

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                       20

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        INVESTORS:

                                        Redwood Partners LLC
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Michael Schwartz
                                            ------------------------------------
                                            Name:  Michael Schwartz
                                                   -----------------------------
                                            Title: Partner
                                                   -----------------------------

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                       21

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                              INVESTORS:

                              Managed Risk Trading, L.P.
                              --------------------------------------------------
                              [PRINT NAME OF INVESTOR]

                              By: /s/ Gregory I. Pages
                                  ----------------------------------------------
                                  Name:  Gregory I. Pages
                                         ---------------------------------------
                                  Title: President of the General Partner
                                         ---------------------------------------

                              __________________________________________________
                              [PRINT NAME OF INVESTOR]

                              By: ______________________________________________
                                  Name:  _______________________________________
                                  Title: _______________________________________

                              __________________________________________________
                              [PRINT NAME OF INVESTOR]

                              By: ______________________________________________
                                  Name:  _______________________________________
                                  Title: _______________________________________

                                       22

<PAGE>

    IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        INVESTORS:

                                        DMG Legacy Fund LLC
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Andrew Wilder
                                            ------------------------------------
                                            Name:  Andrew Wilder
                                                   -----------------------------
                                            Title: CFO, DMG Advisors LLC,
                                                   -----------------------------
                                                   Managing Member
                                                   -----------------------------

                                        DMG Legacy Institutional Fund LLC
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Andrew Wilder
                                            ------------------------------------
                                            Name:  Andrew Wilder
                                                   -----------------------------
                                            Title: CFO, DMG Advisors LLC,
                                                   -----------------------------
                                                   Managing Member
                                                   -----------------------------

                                        DMG Legacy International Ltd.
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Andrew Wilder
                                            ------------------------------------
                                            Name:  Andrew Wilder
                                                   -----------------------------
                                            Title: CFO, DMG Advisors LLC,
                                                   -----------------------------
                                                   Managing Member
                                                   -----------------------------

                                       23

<PAGE>

    IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        INVESTORS:

                                        Royal Bank of Canada
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Steve C. Milke
                                            ------------------------------------
                                            Name:  Steve C. Milke
                                                   -----------------------------
                                            Title: Managing Director
                                                   -----------------------------

                                        By: /s/ Richard Tavoso
                                            ------------------------------------
                                            Name:   Richard Tavoso
                                                   -----------------------------
                                            Title: Managing Director
                                                   ----------------------------

                                        ____________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                       24

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        INVESTORS:

                                        Ascend Partners L.P.
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Malcolm Fairbairn
                                            ------------------------------------
                                            Name:  Malcolm Fairbairn
                                                   -----------------------------
                                            Title: Managing Member
                                                   -----------------------------

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                       25

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        INVESTORS:

                                        Ascend Sapient Partners, L.P.
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Malcolm Fairbairn
                                            ------------------------------------
                                            Name:  Malcolm Fairbairn
                                                   -----------------------------
                                            Title: Managing Member
                                                   -----------------------------

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                       26

<PAGE>

     IN WITNESS WHEREOF, the undersigned Investors and the Company have caused
this Agreement to be duly executed as of the date first above written.

                                        INVESTORS:

                                        Ascend Offshore Fund Ltd.
                                        ----------------------------------------
                                        [PRINT NAME OF INVESTOR]

                                        By: /s/ Malcolm Fairbairn
                                            ------------------------------------
                                            Name:  Malcolm Fairbairn
                                                   -----------------------------
                                            Title: Managing Member
                                                   -----------------------------

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                        ________________________________________
                                        [PRINT NAME OF INVESTOR]

                                        By: ____________________________________
                                            Name:  _____________________________
                                            Title: _____________________________

                                        27

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