Document:

Exhibit
4.5

     

    INVESTOR
RIGHTS AGREEMENT

     

    dated as
of

     

    December
22, 2009

     

    between

     

    TIANWEI
NEW ENERGY HOLDINGS CO., LTD.

     

    and

     

    HOKU
SCIENTIFIC, INC.

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    TABLE
OF CONTENTS

    

    
      
        
          
            
              
                
                  
                    
                      
                        
                          
                            
                              
                                
                                  
                                    
                                      
                                        
                                          
                                            
                                              
                                                
                                                  
                                                    
                                                      
                                                        
                                                          
                                                            
                                                              
                                                                
                                                                  
                                                                    
                                                                      
                                                                        
                                                                          
                                                                            
                                                                              
                                                                                
                                                                                  
                                                                                    
                                                                                      
                                                                                        
                                                                                          
                                                                                            
                                                                                              	 
      	
                                                                                                      Page

                                                                                                    
	
                                                                                                      ARTICLE 1
      Definitions

                                                                                                    	
                                                                                                      1

                                                                                                    
	 	 
	
                                                                                                      Section 1.01.  Definitions

                                                                                                    	
                                                                                                      1

                                                                                                    
	
                                                                                                      Section 1.02.  Other
      Capitalized
      Terms.

                                                                                                    	
                                                                                                      5

                                                                                                    
	
                                                                                                      Section 1.03.  Other
      Definitional and Interpretative Provisions

                                                                                                    	
                                                                                                      5

                                                                                                    
	
                                                                                                      Section 1.04.  Effectiveness of
      this Agreement

                                                                                                    	
                                                                                                      5

                                                                                                    
	 	 
	
                                                                                                      ARTICLE 2
      Registration Rights

                                                                                                    	
                                                                                                      6

                                                                                                    
	 	 
	
                                                                                                      Section 2.01.  Shelf Registration
      Statement

                                                                                                    	
                                                                                                      6

                                                                                                    
	
                                                                                                      Section 2.02.  Demand
      Reistration

                                                                                                    	
                                                                                                      7

                                                                                                    
	
                                                                                                      Section
      2.03.  Shelf
      Take-Downs

                                                                                                    	
                                                                                                      9

                                                                                                    
	
                                                                                                      Section 2.04.  Selection Of
      Underwriters

                                                                                                    	
                                                                                                      9

                                                                                                    
	
                                                                                                      Section 2.05.  Piggyback
      Registration

                                                                                                    	
                                                                                                      10

                                                                                                    
	
                                                                                                      Section 2.06. Registration
      Procedures

                                                                                                    	
                                                                                                      11

                                                                                                    
	
                                                                                                      Section 2.07.  Information
      Supplied

                                                                                                    	
                                                                                                      15

                                                                                                    
	
                                                                                                      Section 2.08.  Expenses

                                                                                                    	
                                                                                                      15

                                                                                                    
	
                                                                                                      Section 2.09.  Indemnification

                                                                                                    	
                                                                                                      16

                                                                                                    
	
                                                                                                      Section 2.10.  Selection of
      Counsel

                                                                                                    	
                                                                                                      19

                                                                                                    
	
                                                                                                      Section 2.11. No Inconsistent Agreements; No
      Free Writing Prospectus

                                                                                                    	
                                                                                                      19

                                                                                                    
	
                                                                                                      Section 2.12.  Termination of Registration
      Rights

                                                                                                    	
                                                                                                      19

                                                                                                    
	 	 
	
                                                                                                      ARTICLE 3
      Transfer restrictions; board Representation

                                                                                                    	
                                                                                                      20

                                                                                                    
	 	 
	
                                                                                                      Section 3.01.  Transfer
      Restrictions

                                                                                                    	
                                                                                                      20

                                                                                                    
	
                                                                                                      Section 3.02.  Board
      Representation

                                                                                                    	
                                                                                                      20

                                                                                                    
	 	 
	
                                                                                                      ARTICLE 4
      Miscellaneous

                                                                                                    	
                                                                                                      20

                                                                                                    
	 	 
	
                                                                                                      Section 4.01.  Notices

                                                                                                    	
                                                                                                      20

                                                                                                    
	
                                                                                                      Section 4.02. Amendments and
      Waivers

                                                                                                    	
                                                                                                      21

                                                                                                    
	
                                                                                                      Section 4.03.  Expenses

                                                                                                    	
                                                                                                      22

                                                                                                    
	
                                                                                                      Section 4.04. Successors and Assigns;
      Assignment

                                                                                                    	
                                                                                                      22

                                                                                                    
	
                                                                                                      Section 4.05.  No Third Party
      Beneficiaries

                                                                                                    	
                                                                                                      22

                                                                                                    
	
                                                                                                      Section 4.06.  Governing
      Law

                                                                                                    	
                                                                                                      22

                                                                                                    
	
                                                                                                      Section 4.07.  Jurisdiction

                                                                                                    	
                                                                                                      22

                                                                                                    
	
                                                                                                      Section 4.08.  WAIVER OF JURY
      TRIAL

                                                                                                    	
                                                                                                      23

                                                                                                    
	
                                                                                                      Section 4.09.  Counterparts;
      Effectiveness

                                                                                                    	
                                                                                                      23

                                                                                                    
	
                                                                                                      Section 4.10. Entire
      Agreement

                                                                                                    	
                                                                                                      23

                                                                                                    
	
                                                                                                      Section 4.11.  Severability

                                                                                                    	
                                                                                                      23

                                                                                                    
	
                                                                                                      Section 4.12.  Specific
      Performance

                                                                                                    	
                                                                                                      24

                                                                                                    

                                                                                            

                                                                                          

                                                                                        

                                                                                      

                                                                                    

                                                                                  

                                                                                

                                                                              

                                                                            

                                                                          

                                                                        

                                                                      

                                                                    

                                                                  

                                                                

                                                              

                                                            

                                                          

                                                        

                                                      

                                                    

                                                  

                                                

                                              

                                            

                                          

                                        

                                      

                                    

                                  

                                

                              

                            

                          

                        

                      

                    

                  

                

              

            

          

        

      

    

    
      
         

      

      
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    INVESTOR
RIGHTS AGREEMENT

     

    INVESTOR
RIGHTS AGREEMENT (this “Agreement”) dated as of
December 22, 2009 between Tianwei New Energy Holdings Co., Ltd., a corporation
organized under the laws of the People’s Republic of China (“Investor”) and Hoku
Scientific, Inc., a Delaware corporation (the “Company”).

     

    WITNESSETH:

     

    WHEREAS,
the Company and Investor have entered into a Securities Purchase Agreement dated
as of September 28, 2009 (the “Securities Purchase
Agreement”), pursuant to which Investor shall have acquired (i)
33,379,287 newly-issued shares of Common Stock, par value $0.001 per share, of
the Company (all such shares purchased by Investor or its permitted assignees,
collectively, the “Purchased
Shares”) and (ii) warrants for the purchase of 10,000,000 shares of
Common Stock (all such warrants purchased by Investor or its permitted
assignees, collectively, the “Purchased
Warrants”).

     

    WHEREAS,
the parties hereto desire to enter into this Agreement in order to enter into
certain arrangements relating to the Company, the Purchased Shares and the
shares of Common Stock deliverable upon exercise of the Purchased Warrants (the
“Warrant
Shares”).

     

    NOW,
THEREFORE, in consideration of the foregoing premises and the representations,
warranties, covenants and agreements set forth herein, as well as other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged and accepted, and intending to be legally bound hereby, Investor
and the Company hereby agree as follows:

     

    ARTICLE
1

    Definitions

     

    Section
1.01.  Definitions.  (a)
The following terms, as used herein, have the following meanings:

     

    “1933 Act” means the Securities
Act of 1933, as amended, and the rules and regulations promulgated
thereunder.

     

    “1934 Act” means the Securities
Exchange Act of 1934, as amended, and the rules and regulations promulgated
thereunder.

     

    “Adverse Disclosure” means
public disclosure of material non-public information, which disclosure in the
good faith judgment of a majority of the Company Board after consultation with
counsel to the Company would have a material adverse effect on the ability of
the Company to consummate a material acquisition, disposition or other
comparable extraordinary transaction.

    
      
         

      

      
         

        
          

        

      

      
         

      

    

     

    “Affiliate” means, with respect
to any Person, any other Person directly or indirectly controlling, controlled
by, or under common control with such Person.  For purposes of the
immediately preceding sentence, the term “control” (including, with correlative
meanings, the terms “controlling,” “controlled by” and “under common control
with”), as used with respect to any Person, means the possession, directly or
indirectly, of the power to direct or cause the direction of the management and
policies of such Person, whether through ownership of voting securities, by
contract or otherwise.

     

    “Closing Date” has the meaning
ascribed to such term in the Securities Purchase Agreement.

     

    “Common Stock” means the Common
Stock, par value $0.001 per share, of the Company and any securities issued in
respect thereof, or in substitution therefor, in connection with any stock
split, dividend or combination, or any reclassification, recapitalization,
merger, consolidation, exchange or other similar reorganization.

     

    “Equity Securities” means any
and all shares of capital stock or other securities of the Company convertible
into, or exchangeable or exercisable for, such shares, and options, warrants or
other rights to acquire such shares (including the Warrants and the Warrant
Shares).

     

    “Form S-1” means a registration
statement on Form S-1 under the 1933 Act, or any successor form
thereto.

     

    “Form S-3” means a registration
statement on Form S-3 (other than on Form S-3ASR) under the 1933 Act, or any
successor form thereto.

     

    “Form S-3ASR” means an
“automatic shelf” registration statement on Form S-3 filed by a Well-Known
Seasoned Issuer.

     

    “Form S-4” means a registration
statement on Form S-4 under the 1933 Act, or any successor form
thereto.

     

    “Form S-8” means a registration
statement on Form S-8 under the 1933 Act, or any successor form
thereto.

     

    “Holder” means Investor and any
of its transferees, assignees and successors that beneficially owns any
Registrable Securities.

    
      
         

      

      
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    “incur” means, directly or
indirectly, to incur, refinance, create, assume, guarantee or otherwise become
liable.

     

    “Issuer Free Writing
Prospectus” shall have the meaning set forth in Rule 433 under the 1933
Act.

     

    “NASD” means the National
Association of Securities Dealers.

     

    “NASDAQ” means The Nasdaq Stock
Market, or any successor thereto.

     

    “Person” means an individual,
corporation, partnership, limited liability company, association, trust or other
entity or organization.

     

    “Prospectus” means the
prospectus included in any Registration Statement, including any preliminary
prospectus, any final prospectus and any such prospectus as amended or
supplemented by any prospectus supplement, including any such prospectus
supplement with respect to the terms of the offering of any portion of the
Registrable Securities covered by a Registration Statement, and by all other
amendments and supplements to a prospectus, including post-effective amendments,
and in each case including all materials incorporated by reference
therein.

     

    “Registrable Securities” means
(i) 30% of the Purchased Shares (which may be held by one or more, or any
Holder(s)), (ii) the Warrant Shares held by any Holder or issuable upon the
exercise of Warrants held by any Holder and (iii) any capital stock or
other securities which may be issued, converted, exchanged or distributed in
respect thereof, or in substitution therefor, in connection with any stock
split, dividend or combination, or any recapitalization, reclassification,
merger, consolidation, exchange or other similar reorganization with respect to
that portion of the Purchased Shares deemed Registrable Securities hereunder or
the Warrant Shares, as the case may be.  As to any particular
Registrable Securities, once issued, such Registrable Securities shall cease to
be Registrable Securities when (A) a Registration Statement with respect to
the sale by the Holder of such securities shall have become effective under the
1933 Act and such securities shall have been disposed of in accordance with such
registration statement, (B) such securities shall have been distributed to
the public pursuant to Rule 144, (C) such securities shall have become
eligible for sale by the Holder thereof pursuant to the last sentence of Rule
144(b)(1)(i), or (D)such securities shall have ceased to be
outstanding.  For purposes of this Agreement, any required calculation
of the amount of, or percentage of, Registrable Securities shall be based on the
number of shares of Common Stock which are Registrable Securities, including
shares issuable upon the conversion, exchange or exercise of any security
convertible, exchangeable or exercisable into Common Stock (including the
Purchased Warrants).

    
      
         

      

      
        -3-

        
          

        

      

      
         

      

    

     

    “Registration Expenses” means
any and all expenses incident to performance of or compliance with Article 2,
including (i) all SEC and securities exchange or NASD registration and
filing fees (including, if applicable, the fees and expenses of any “qualified
independent underwriter,” as such term is defined in Section 2720 of the
bylaws of the NASD, and of its counsel), (ii) all fees and expenses of
complying with securities or blue sky laws (including fees and disbursements of
counsel for the underwriters in connection with blue sky qualifications of the
Registrable Securities and any escrow fees), (iii) all printing, messenger
and delivery expenses, (iv) all fees and expenses incurred in connection
with the listing of the Registrable Securities on any securities exchange,
(v) the fees and disbursements of counsel for the Company and of its
independent public accountants, including the expenses of any special audits
and/or “cold comfort” letters required by or incident to such performance and
compliance, (vi) the reasonable fees and disbursements of counsel selected
pursuant to Section 2.10, (vii) any fees and disbursements of underwriters
customarily paid by the issuers, including liability insurance if the Company so
desires, and (viii) the reasonable expenses incurred by the Company or any
underwriters in connection with any “road show” undertaken pursuant to Section
2.06.

     

    “Registration Statement” means
the registration statements required to be filed hereunder, including (in each
case) the Prospectus, amendments and supplements to such registration statement
or Prospectus, including pre- and post-effective amendments, all exhibits
thereto, and all material incorporated by reference or deemed to be incorporated
by reference in such registration statement..

     

    “Rule 144” means Rule 144
under the 1933 Act (or any successor rule).

     

    “Rule 415” means Rule 415 under
the 1933 Act (or any successor rule).

     

    “Rule 424” means Rule 424 under
the 1933 Act (or any successor rule).

     

    “SEC” means the U.S. Securities
and Exchange Commission or any successor thereto.

     

    “Third Party” means any Person
or “group” (as defined in Section 13(d) of the 1934 Act), other than Investor or
any of its Affiliates.

     

    “Underwritten Offering” means
any Marketed Underwritten Offering, Underwritten Shelf Take-Down or other
underwritten offering pursuant to Section 2.02.

    
      
         

      

      
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    “Warrants” means the Purchased
Warrants and any securities issued in respect thereof, or in substitution
therefor, in connection with any stock split, dividend or combination, or any
reclassification, recapitalization, merger, consolidation, exchange or other
similar reorganization (other than the Warrant Shares upon exercise
thereof).

     

    “Well-Known Seasoned Issuer”
has the meaning set forth in Rule 405 under the 1933 Act.

     

    Section
1.02.  Other
Capitalized Terms. Capitalized terms used but not defined herein or
in Section
1.01 shall have the meanings given to them in the Securities Purchase
Agreement.

     

    Section
1.03.  Other
Definitional and Interpretative Provisions.  The words
“hereof”, “herein” and “hereunder” and words of like import used in this
Agreement shall refer to this Agreement as a whole and not to any particular
provision of this Agreement.  The captions herein are included for
convenience of reference only and shall be ignored in the construction or
interpretation hereof.  References to Articles, Sections, Exhibits and
Schedules are to Articles, Sections, Exhibits and Schedules of this Agreement
unless otherwise specified.  All Exhibits and Schedules annexed hereto
or referred to herein are hereby incorporated in and made a part of this
Agreement as if set forth in full herein.  Any capitalized terms used
in any Exhibit or Schedule but not otherwise defined therein, shall have the
meaning as defined in this Agreement.  Any singular term in this
Agreement shall be deemed to include the plural, and any plural term the
singular.  Whenever the words “include”, “includes” or “including” are
used in this Agreement, they shall be deemed to be followed by the words
“without limitation”, whether or not they are in fact followed by those words or
words of like import.  “Writing”, “written” and comparable terms refer
to printing, typing and other means of reproducing words (including electronic
media) in a visible form.  References to any agreement or contract are
to that agreement or contract as amended, modified or supplemented from time to
time in accordance with the terms hereof and thereof; provided that with respect to
any agreement or contract listed on any schedules hereto, all such amendments,
modifications or supplements must also be listed in the appropriate
schedule.  References to any Person include the successors and
permitted assigns of that Person.  References from or through any date
mean, unless otherwise specified, from and including or through and including,
respectively.  References to “law”, “laws” or to a particular statute
or law shall be deemed also to include an and all Applicable
Law.  References to “$” and “dollars” are to the currency of the
United States.

     

    Section
1.04.  Effectiveness
of this Agreement.  This Agreement shall have effect as of the
Closing unless expressly stated otherwise.  Notwithstanding any other
provision to the contrary in this Agreement, this Agreement shall not take
effect until the Closing, and in the event the Securities Purchase Agreement is
terminated, this Agreement shall be void ab initio.

    
      
         

      

      
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    ARTICLE
2

    Registration
Rights

     

    Section
2.01.  Shelf
Registration Statement.  (a) The Company shall:

     

    (i)         as
promptly as practicable, but in any event not later than 30 days, after the
Closing Date (the “Filing
Date”), prepare and file with the SEC a “Shelf” Registration Statement
(the “Shelf Registration
Statement”) covering the resale of the Registrable Securities by the
Holders thereof from time to time in accordance with the methods of distribution
elected by such Holders, to be made on a continuous basis pursuant to Rule
415.  The Shelf Registration Statement shall be on Form S-3 (except if
the Company is not then eligible to register for resale the Registrable
Securities on Form S−3, in which case such registration shall be on another
appropriate form in accordance herewith, reasonably acceptable to Holders of a
majority of the Registrable Securities), as modified by the Company
as necessary to conform to comments from the SEC;

     

    (ii)        use
its reasonable best efforts to cause the Shelf Registration Statement to be
declared effective under the 1933 Act as promptly as possible after the filing
thereof, but in any event prior to the 90th day (or
the 120th day in
the case of a “full review” by the SEC) after the Closing Date (the “Effectiveness
Date”);

     

    (iii)       within
two Business Days after the Shelf Registration Statement is declared effective,
file a final Prospectus with the SEC pursuant to Rule 424 and notify the Holders
via facsimile of effectiveness of the Shelf Registration Statement;

     

    (iv)       use
its reasonable best efforts to keep the Shelf Registration Statement
continuously effective under the 1933 Act until such time as all Registrable
Securities covered by such Registration Statement have been sold, or may be sold
without volume restrictions pursuant to Rule 144 under the 1933 Act or any other
rule of similar effect, as determined by the counsel to the Company pursuant to
a written opinion letter to such effect, addressed and acceptable to the
Company’s transfer agent and the affected Holders (the “Effectiveness
Period”);

     

    (v)        during
the Effectiveness Period, furnish to each Holder with respect to the Registrable
Securities registered under the Shelf Registration Statement (and to each
underwriter, if any, of such Registrable Securities) such number of copies of
Prospectuses and such other documents as such Holder may reasonably request, in
order to facilitate the public sale or other disposition of all or any of the
Registrable Securities by such Holder;

    
      
         

      

      
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    (vi)       during
the Effectiveness Period, notify each holder of Registrable Securities covered
by such Registration Statement at any time when a Prospectus relating thereto is
required to be delivered under the 1933 Act of the happening of any event as a
result of which the prospectus included in such Registration Statement, as then
in effect, includes an 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 not misleading in light of the circumstances then existing;
and

     

    (vii)      file
documents required of the Company for normal Blue Sky clearance in states
specified in writing by any Holder; provided that the Company
shall not be required to qualify to do business or consent to service of process
in any jurisdiction in which it is not now so qualified or has not so
consented.

     

    (b)        
  From the date hereof until the date the Shelf Registration Statement
is declared effective under the 1933 Act, the Company shall not file, nor permit
the filing of, any Registration Statement other than (i) the Shelf Registration
Statement and (ii) a Registration Statement on Form S-8 with respect to the
Stock Plans.

     

    Section
2.02.  Demand
Registration.  (a)  If, on or at any time after the
Effectiveness Date there is no currently effective Shelf Registration Statement,
then at any time thereafter, upon written notice (a “Demand”) from a Holder or
Holders holding at least 50% of the Registrable Securities (collectively, the
“Demand Holder”)
requesting that the Company effect the registration under the 1933 Act of any or
all of the Registrable Securities held by the Demand Holder, which notice shall
specify the amount and intended method or methods of disposition of such
Registrable Securities, including pursuant to a shelf registration statement
utilizing Rule 415 (a “Shelf Registration”), the
Company shall, within five days after receiving the Demand, give written notice
(the “Request Notice”)
of such registration request to all other Holders, except if all the Registrable
Securities are held by a single Holder, no Request Notice shall be required, and
thereupon will, subject to the limitations set forth in Section 2.02(c), as
promptly as possible (and in any event no later than 30 days after the date of
the Demand), file and use its reasonable best efforts to cause to be declared
effective under the 1933 Act, a Registration Statement to effect the
registration under the 1933 Act of (i) such Registrable Securities which the
Company has been so requested to register by the Demand Holder under the Demand
and (ii) the Registrable Securities which the Company has been requested to
register by written request to the Company by the Holders within ten days after
the giving of the Request Notice (which request shall specify the amount and
intended method or methods of disposition of such Registrable Securities), all
to the extent necessary to permit the disposition (in accordance with the
intended method(s) thereof as aforesaid) of the Registrable Securities and such
other securities so to be registered.

    
      
         

      

      
        -7-

        
          

        

      

      
         

      

    

     

    (b)        
  A registration requested pursuant to this Section 2.02 will not be
deemed to have been effected unless: (i) it has been declared effective by
the SEC or has otherwise become effective under the 1933 Act and remains
effective for not less than 180 days, or, if such Registration Statement relates
to an underwritten offering, such longer period as, in the opinion of counsel
for the underwriter or underwriters is required by law for the delivery of a
Prospectus in connection with the sale of Registrable Securities by an
underwriter or dealer; or (ii) it has been filed with the SEC but abandoned
or withdrawn at the request of the Demand Holder prior to effectiveness, other
than an abandonment or withdrawal requested because of: (A) the stock price
of the Common Stock falling 15% or more since the delivery of a request for
registration pursuant to this Section 2.02, (B) a material adverse change
in the Company’s and the Subsidiaries’ financial condition, business, assets,
results of operations financial condition, taken as a whole, or (D) the
discovery of materially adverse, non-public information concerning the Company
and the Subsidiaries, taken as a whole.

     

    (c)       
   Notwithstanding anything in this Agreement to the
contrary:

     

    (i)         if
the filing of a Registration Statement in respect of a Demand would require the
Company to make an Adverse Disclosure, the Company may, upon giving prompt
written notice of such action to the Holders, delay the filing of such
Registration Statement for the shortest period of time determined in good faith
by the Company to be necessary for such purpose; provided that the Company
shall not be permitted to do so (A) more than two times during any twenty-four
month period, (B) for a period not exceeding 40 days on any one occasion or (C)
for a period exceeding 60 days in any 12 month period.  The Company
shall immediately notify the Holders of the expiration of any period during
which it exercised its rights under this Section 2.02(c)(i);

     

    (ii)        the
Company shall not be obligated to file a Registration Statement in respect of a
Demand (A) on more than two occasions or (B) within a period of one (1) month
after the effective date of any other Registration Statement of the Company
demanded pursuant to this Section 2.02;

     

    (iii)       a
Holder may elect to withdraw its Registrable Securities from a Demand
registration pursuant to this Section 2.02 at any time, and if all such Holders
do so, the Company shall cease its efforts to secure registration;
and

    
      
         

      

      
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    (iv)       all
Demand registrations pursuant to this Section 2.02 shall be on Form S−3, except
if the Company is not then eligible to register for resale the Registrable
Securities on Form S-3, in which case such registration shall be on another
appropriate form, reasonably acceptable to the Holders of a majority of the
Registrable Securities, and as shall permit the disposition of the Registrable
Securities in accordance with the intended method of distribution or methods of
distribution specified in the applicable Demand Holder’s requests for such
registration.

     

    (d)        
  Nothing in this Agreement shall limit the right of any Holder to
request the registration of the Registrable Securities issuable upon exercise of
the Warrants by such Holder (subject to such exercise occurring prior to the
completion of the sale of the underlying Registrable Securities prior to such
registration), notwithstanding the fact that at the time of the request such
Holder Warrants are not Registrable Securities.

     

    Section
2.03.  Shelf
Take-Downs.  Any of the Holders whose Registrable Securities
have been registered pursuant to a Shelf Registration may initiate an offering
or sale of Registrable Securities pursuant to such Shelf Registration (each, a
“Shelf Take-Down”) and
such Holder shall not be required to permit the offer and sale of Registrable
Securities by other Holders in connection with such Shelf
Take-Down.  If the initiating Holders so elect by written request to
the Company, a Shelf Take-Down may be in the form of an underwritten offering
(an “Underwritten Shelf
Take-Down”);
provided that any underwritten sale pursuant to a Shelf Registration
pursuant to this Section 2.03 must be for a number of Registrable Securities
which, based on the good faith determination of the Holders, will result in
gross proceeds of at least $5 million in the case of any Marketed Underwritten
Offering or $1 million in the case of any other underwritten
offering.  The Company shall, if so requested, file and effect an
amendment or supplement of the Shelf Registration for such purpose as soon as
practicable.

     

    Section
2.04.  Selection Of
Underwriters.  If a Shelf Take-Down involves an underwritten
offering, the investment bankers, underwriters and managers for such
registration shall be selected by the Holders of a majority in interest of the
Registrable Securities which the Company has been requested to register; provided that such selection
of investment bankers, underwriters and managers shall be subject to the
reasonable approval by the Company.

    
      
         

      

      
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    Section
2.05.  Piggyback
Registration.  (a) If the Company proposes to register Equity
Securities under the 1933 Act (other than (x) a registration under Section 2.01,
2.02 or 2.03, (y) a registration on Form S−4 or S−8 or any successor form to
such forms), involving the offering of such Equity Securities at any time,
whether or not for sale for its own account, in a manner which would permit
registration of Registrable Securities of the same class of such Equity
Securities for sale to the public under the 1933 Act, it will, at each such
time, give prompt written or telephonic notice (a “Piggyback Offering Notice”) to
the Holders of: its intention to do so, the form on which the Company expects to
effect such registration (e.g. Form S-1, Form S-3, Form
S-3ASR), the anticipated filing date with the SEC of such registration
statement, the anticipated date that the registration statement will be declared
or otherwise become effective, whether the offering is to be underwritten, in
the case of Form S-3 or Form S-3ASR, the anticipated date and time that the
offering will be made, and (unless all of the Holders’ Registrable Securities
are then registered pursuant to Section 2.02 or 2.03 or a Shelf Registration
Statement under Section 2.01 is in effect) such notice shall offer the Holders
the opportunity to register such number of Registrable Securities as each such
Holder may request in writing (a “Piggyback
Registration”).  The registration rights provided for in this
Section 2.05 are in addition to, and not in lieu of, registrations made pursuant
to Section 2.01, 2.02 or 2.03.

     

    (b)        Subject
to Section 2.05(c), the Company shall include in such Registration Statement all
such Registrable Securities which are requested to be included therein within 10
days after the receipt by such Holder of any such notice.  If at any
time after giving written notice of its intention to register any securities and
prior to the effective date of the Registration Statement filed in connection
with such registration, the Company shall determine for any reason not to
register or to delay registration of such securities, the Company may, at its
election, give written notice of such determination to each Holder of
Registrable Securities and, (x) in the case of a determination not to register,
shall be relieved of its obligation to register any Registrable Securities in
connection with such registration, and (y) in the case of a determination to
delay registering, shall be permitted to delay registering any Registrable
Securities for the same period as the delay in registering such other
securities.  If the offering pursuant to a Piggyback Registration is
to be an underwritten offering, then each Holder making a request for its
Registrable Securities to be included therein must, and the Company shall make
such arrangements with the underwriters so that each such Holder may,
participate in such underwritten offering on the same terms as the Company and
other Persons selling securities in such underwritten offering. If the offering
pursuant to such registration is to be on any other basis, then each Holder
making a request for a Piggyback Registration pursuant to this Section 2.05 must
participate in such offering on such basis.  Each Holder shall be
permitted to withdraw all or part of such Holder’s Registrable Securities from a
Piggyback Registration at any time prior to effectiveness of the Registration
Statement.

    
      
         

      

      
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    (c)        
  If the managing underwriter or underwriters of any proposed
underwritten offering of a class of securities included in a Piggyback
Registration (or in the case of a Piggyback Registration not being underwritten,
the Company) informs the Holders of Registrable Securities sought to be included
in such registration in writing that, in its or their opinion, the total amount
or kind of securities which such Holders and any other Persons intend to include
in such offering exceeds the number which can be sold in such offering without
being likely to have a significant adverse effect on the price, timing or
distribution of the class or classes of the securities offered or the market for
the class or classes of securities offered, then the securities of each class to
be included in such registration shall be allocated as follows:

     

    (i)         first,
100% of the securities that the Company proposes to sell;

     

    (ii)        second,
and only if all the securities referenced in clause (i) have been included, the
number of Registrable Securities of such class that, in the opinion of such
underwriter or underwriters (or in the case of a Piggyback Registration not
being underwritten, the Company), can be sold without having such adverse effect
shall be included therein, with such number to be allocated pro rata among the
Holders which have requested participation in the Incidental Registration
(based, for each such Holder, on the percentage derived by dividing (x) the
number of Registrable Securities of such class which such Holder has requested
to include in such Incidental Registration by (y) the aggregate number of
Registrable Securities of such class which all such Holders have requested to
include); and

     

    (iii)       third,
and only if all of the Registrable Securities referenced in clauses (i) and (ii)
above have been included, any other securities eligible for inclusion in such
registration shall be included therein.

     

    Section
2.06. Registration
Procedures.  If and whenever the Company is required to effect
a registration of any Registrable Securities as provided in this Agreement, the
Company will:

     

    (a)           promptly
prepare and file with the SEC a registration statement with respect to such
Registrable Securities and use best efforts to cause a registration statement
with respect to a demand registration pursuant to Section 2.02 to be filed (in
the case of a registration pursuant to Form S-3ASR), or become effective (in the
case of any registration other than pursuant to Form S-3ASR) as promptly as
practicable;

    
      
         

      

      
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    (b)       
   prepare and file with the SEC such amendments and supplements
to such registration statement (including 1934 Act documents incorporated by
reference into the registration statement) and the Prospectus used in connection
therewith as may be necessary to keep such registration statement effective for
a period not in excess of 90 days (or such longer period as may be requested by
the Holders in the event of a shelf registration statement) other than the Shelf
Registration Statement which shall remain effective for the Effectiveness Period
and to comply with the provisions of the 1933 Act and the 1934 Act with respect
to the disposition of all securities covered by such registration statement
during such period in accordance with the intended methods of disposition by the
seller or sellers thereof set forth in such registration statement; provided that before filing a
registration statement or Prospectus or any amendments or supplements thereto in
accordance with Section 2.06(a) or this Section 2.06(b) to the extent that doing
so will not materially interfere with the timing of the offering (i) the Company
will furnish to counsel selected pursuant to Section 2.10 copies of all
documents proposed to be filed and (ii) such documents will be subject to the
review of such counsel reasonably in advance of any filing to permit a
reasonable opportunity to review and comment in light of the
circumstances;

     

    (c)       
   use reasonable best efforts to comply with all applicable
securities laws in the United States and register or qualify such Registrable
Securities covered by such registration in such jurisdictions in the United
States as each seller shall reasonably request, and do any and all other acts
and things which may be reasonably necessary to enable such seller to consummate
the disposition in such jurisdictions of the Registrable Securities owned by
such seller, except that the Company shall not for any such purpose be required
to qualify generally to do business as a foreign corporation in any jurisdiction
where, but for the requirements of this Section 2.06(c), it would not be
obligated to, subject itself to taxation in any such jurisdiction or to consent
to general service of process in any such jurisdiction;

     

    (d)        
  promptly furnish to each seller of such Registrable Securities such
number of copies of such registration statement and of each amendment and
supplement thereto (in each case including all exhibits filed therewith,
including any documents incorporated by reference), such number of copies of the
Prospectus included in such registration statement (including each preliminary
prospectus and summary prospectus), in conformity with the requirements of the
1933 Act, and such other similar documents as such seller may reasonably request
necessary to facilitate the disposition of the Registrable Securities by such
seller;

     

    (e)       
   notify each seller of any such Registrable Securities covered
by such registration statement promptly if the Company becomes aware that the
Prospectus included in such registration statement, as then in effect, or the
registration statement includes an 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 not misleading in the light of the circumstances then
existing and, prepare and furnish to such seller a reasonable number of copies
of an amended or supplemental prospectus as may be necessary so that, as
thereafter delivered to the purchasers of such Registrable Securities, such
Prospectus shall not include an 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 not misleading in the light of the circumstances then
existing;

    
      
         

      

      
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    (f)        otherwise
use reasonable best efforts to comply with all applicable rules and regulations
of the SEC, and make available to its security holders, as soon as reasonably
practicable (but not more than 18 months) after the effective date of the
registration statement, an earnings statement which shall satisfy the provisions
of Section 11(a) of the 1933 Act;

     

    (g)       (i) use
reasonable best efforts to list such Registrable Securities on NASDAQ to the
extent required and (ii) use reasonable best efforts to provide for a
transfer agent and registrar for such Registrable Securities covered by such
registration statement not later than the effective date of such registration
statement;

     

    (h)        in
connection with an Underwritten Shelf Take-Down, promptly enter into an
underwriting agreement in customary form, which may include indemnification
provisions in favor of underwriters and other Persons in addition to, or in
substitution for, the provisions of Section 2.09, and take such other actions as
the managing underwriters reasonably request in order to expedite or facilitate
the disposition of such Registrable Securities;

     

    (i)        in
connection with an Underwritten Shelf Take-Down, promptly obtain a “cold
comfort” letter or letters from the Company’s independent public accounts in
customary form and covering matters of the type customarily covered by “cold
comfort” letters provided to sellers of securities as the seller or sellers of a
majority of shares of such Registrable Securities shall reasonably
request;

     

    (j)        promptly
make available for inspection by any seller of such Registrable Securities
covered by such registration statement, by any underwriter participating in any
disposition to be effected pursuant to such registration statement and by any
attorney, accountant or other agent retained by any such seller or any such
underwriter, all pertinent financial and other records, pertinent corporate
documents and properties of the Company, and cause all of the Company’s
officers, directors and employees to supply all information reasonably requested
by any such seller, underwriter, attorney, accountant or agent in connection
with the “due diligence” of such seller or such underwriter with respect to such
registration statement, subject to the execution of a mutually acceptable
confidentiality agreement;

    
      
         

      

      
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    (k)       promptly
notify counsel (selected pursuant to Section 2.10) for the Holders of
Registrable Securities included in such registration statement and the managing
underwriter or agent and confirm such notice in writing (i) when the
registration statement, or any post-effective amendment to the registration
statement, shall have become effective, or any supplement to the Prospectus and
any amendments to the Prospectus shall have been filed (other than in the case
of a registration pursuant to Form S-3ASR), (ii) of the receipt of any
comments from the SEC, (iii) of any request by the SEC to amend the
registration statement or amend or supplement the Prospectus or for additional
information and (iv) of the issuance by the SEC of any stop order
suspending the effectiveness of the registration statement or of any order
preventing or suspending the use of any Prospectus, or of the suspension of the
qualification of the registration statement for offering or sale in any
jurisdiction, or of the institution or threatening of any proceedings for any of
such purposes;

     

    (l)        use
reasonable best efforts to prevent the issuance of any stop order suspending the
effectiveness of the registration statement or of any order preventing or
suspending the use of any Prospectus and, if any such order is issued, to obtain
the withdrawal of any such order as soon as practicable;

     

    (m)      (i) if
requested by the managing underwriter or agent or any Holder of Registrable
Securities covered by the registration statement, promptly incorporate in a
prospectus supplement or post-effective amendment such information as the
managing underwriter or agent or such Holder reasonably requests to be included
therein, including, with respect to the number of Registrable Securities being
sold by such Holder to such underwriter or agent, the purchase price being paid
therefor by such underwriter or agent; and (ii) make all required filings
of such prospectus supplement or post-effective amendment as soon as practicable
after being notified of the matters incorporated in such prospectus supplement
or post-effective amendment;

     

    (n)       cooperate
with the Holders of Registrable Securities covered by the registration statement
and the managing underwriter or agent, if any, to facilitate the timely
preparation and delivery of certificates (not bearing any restrictive legends)
representing securities to be sold under the registration statement, and enable
such securities to be in such denominations and registered in such names as the
managing underwriter or agent, if any, or such Holders may reasonably
request;

     

    (o)       in
connection with an Underwritten Shelf Take-Down, promptly obtain for delivery to
the Holders of Registrable Securities being registered and to the underwriter or
agent an opinion or opinions from counsel for the Company in customary form and
scope for sellers of securities;

    
      
         

      

      
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    (p)       cooperate
with each seller of Registrable Securities and each underwriter or agent
participating in the disposition of such Registrable Securities and their
respective counsel in connection with any filings required to be made with the
NASD;

     

    (q)       use
reasonable best efforts to make available certain of the executive officers of
the Company (which in any event shall include the Company’s chief executive
officer) for a ten Business Day period to participate and to cooperate with the
Holders of Registrable Securities and any underwriters in any “road shows” or
other selling efforts, in each case in the United States, that may be reasonably
be requested upon reasonable notice thereof by the Holders in connection with an
Underwritten Shelf Take-Down.

     

    Section
2.07.  Information
Supplied.  It shall be a condition precedent to the obligations
of the Company to take any action to register the Registrable Securities held by
any Holder as to which any registration is being effected that such Holder shall
furnish the Company with such information regarding such Holder that is
pertinent to the disclosure requirements relating to the registration and the
distribution of such securities as the Company may from time to time reasonably
request.  Each Holder agrees to promptly furnish to the Company all
information required to be disclosed in order to make the information previously
furnished to the Company by such Holder not misleading.

     

    Section
2.08.  Expenses.  Except
as provided herein, the Company will pay all Registration Expenses in connection
with registrations of Registrable Securities requested pursuant to Sections
2.01, 2.02, 2.03 or 2.05; provided that the Company
shall not be obligated to pay the Registration Expenses in more than three
Underwritten Offerings (which shall in no event include more than two Marketed
Underwritten Offerings).  To the extent the Holders engage in more
than three Underwritten Offerings, the Holders shall pay all Registration
Expenses with respect to such Underwritten Offerings and the Company will have
no obligation to pay any such Registration Expenses.  Each Holder
shall pay all underwriting discounts and commissions, broker fees and
commissions, and transfer taxes, if any, relating to the sale or disposition of
such Holder’s Registrable Securities pursuant to any registration
statement.

    
      
         

      

      
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    Section
2.09.  Indemnification.  (a)
In the event of any registration of any securities of the Company under the 1933
Act pursuant to Sections 2.01, 2.02, 2.03 or 2.05, to the fullest extent
permitted by law, the Company will indemnify and hold harmless each Holder, each
Affiliate of such Holder and their respective directors and officers, members or
general and limited partners (and the directors, officers, employees, affiliates
and each Person who controls such Holder (within the meaning of Section 15 of
the 1933 Act or Section 20 of the 1934 Act) (hereinafter referred to as a “Controlling Person”) of any of
the foregoing), and each underwriter, if any, and each person who controls
within the meaning of Section 15 of the 1933 Act any underwriter (collectively,
the “Seller Indemnified
Parties”), against all claims, losses, damages and liabilities, joint or
several, actions or proceedings (whether commenced or threatened in writing) in
respect thereof (“Claims”) and expenses arising
out of or based on: (i)  any untrue statement or alleged untrue statement
of a material fact contained in a registration statement (or any amendment or
supplement thereto), including all documents incorporated therein by reference,
or any omission or alleged omission therefrom of a material fact, in each case,
necessary in order to make the statements therein not misleading, in light of
the circumstances under which they were made, (ii) any untrue statement or
alleged untrue statement of a material fact contained in a Prospectus (or any
amendment or supplement thereto), including all documents incorporated therein
by reference, or any omission or alleged omission therefrom of a material fact,
in each case, necessary in order to make the statements therein not misleading,
in light of the circumstances under which they were made,  or (iii)
any untrue statement or alleged untrue statement of a material fact contained in
any Issuer Free Writing Prospectus prepared by it or authorized by it in writing
for use by such Holder (or any amendment or supplement thereto), including all
documents incorporated therein by reference, or any omission or alleged omission
therefrom of a material fact, in each case, necessary in order to make the
statements therein not misleading, in light of the circumstances under which
they were made, and the Company will reimburse each such Seller Indemnified
Party for any reasonable fees and disbursements of counsel and any other
reasonable out-of-pocket expenses incurred in connection with investigating and
defending or settling any such Claim; provided that the Company
will not be liable in any such case to the extent that any such claim, loss,
damage, liability, or action arises out of or is based on any untrue statement
or alleged untrue statement or omission or alleged omission by such Holder or
underwriter but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission is made in such registration
statement, Prospectus, or Issuer Free Writing Prospectus in reliance upon and in
conformity with written information furnished to the Company by or on behalf of
such Holder and stated to be specifically for use therein; and provided that, the indemnity
agreement contained in this Section 2.09(a) shall not apply to amounts paid in
settlement of any such Claim if such settlement is effected without the consent
of the Company (which consent shall not be unreasonably withheld or
delayed).

    
      
         

      

      
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    (b)        To
the fullest extent permitted by law, each Holder will, if Registrable Securities
held by such Holder are included in the registration statement or Prospectus,
indemnify and hold harmless the Company, all other Holders or any prospective
underwriter, as the case may be, and any of their respective Affiliates,
directors, officers and Controlling Persons (collectively, the “Company Indemnified Parties”),
against all Claims and expenses arising out of or based on:  (i) any
untrue statement or alleged untrue statement of a material fact contained in a
registration statement (or any amendment or supplement thereto), including all
documents incorporated therein by reference, or any omission or alleged omission
therefrom of a material fact, in each case, necessary in order to make the
statements therein not misleading, in light of the circumstances under which
they were made, (ii)  any untrue statement or alleged untrue statement
of a material fact contained in a Prospectus (or any amendment or supplement
thereto), including all documents incorporated therein by reference, or any
omission or alleged omission therefrom of a material fact, in each case,
necessary in order to make the statements therein not misleading, in light of
the circumstances under which they were made or (iii) any untrue statement or
alleged untrue statement of a material fact contained in any Issuer Free Writing
Prospectus (or any amendment or supplement thereto), including all documents
incorporated therein by reference, or any omission or alleged omission therefrom
of a material fact, in each case, necessary in order to make the statements
therein not misleading, in light of the circumstances under which they were
made, and the Holder will reimburse each such Company Indemnified Party for any
reasonable fees and disbursements of counsel and any other reasonable expenses
incurred in connection with investigating and defending or settling any such
Claim, in each case to the extent, but only to the extent that such untrue
statement (or alleged untrue statement) or omission (or alleged omission) is
made in such registration statement, Prospectus, or Issuer Free Writing
Prospectus in reliance upon and in conformity with written information furnished
to the Company by or on behalf of such Holder and stated to be specifically for
use therein; provided
that the indemnity agreement contained in this Section 2.09(b) shall not apply
to amounts paid in settlement of any such Claim if such settlement is effected
without the consent of the Company (which consent shall not be unreasonably
withheld or delayed); provided
further that in the absence of fraud by such Holder, the liability of
each selling Holder of Registrable Securities hereunder shall be limited to the
net proceeds received by such selling Holder from the sale of Registrable
Securities covered by such registration statement.

    
      
         

      

      
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    (c)        Promptly
after receipt by a Person entitled to indemnification pursuant to this Section
2.09 (an “Indemnified
Party”) hereunder of written notice of the commencement of any action or
proceeding with respect to which a claim for indemnification may be made
pursuant to this Section 2.09, such Indemnified Party will, if a claim in
respect thereof is to be made against an indemnifying party, give written notice
to the latter of the commencement of such action or proceeding; provided that the failure of
the Indemnified Party to give notice as provided herein shall not relieve the
indemnifying party of its obligations under this Section 2.09, except to the
extent that the indemnifying party is prejudiced in any material respect by such
failure to give notice.  In case any such action or proceeding is
brought against an Indemnified Party, unless in such Indemnified Party’s
reasonable judgment, based upon advice of counsel, a conflict of interest
between such indemnified and indemnifying parties may exist in respect of such
action or proceeding (in which case the Indemnified Party shall have the right
to assume or continue its own defense and the indemnifying party shall be liable
for any reasonable expenses therefor (but in no event will bear the expenses for
more than one firm of counsel for all Indemnified Parties in each jurisdiction
who shall, with respect to Seller Indemnified Parties, be approved by the
majority of the participating Holders in the registration in respect of which
such indemnification is sought), the indemnifying party will be entitled to
participate in and to assume the defense thereof (at its expense), jointly with
any other indemnifying party similarly notified to the extent that it may wish,
with counsel reasonably satisfactory to such Indemnified Party, and after notice
from the indemnifying party to such Indemnified Party of its election so to
assume the defense thereof, the indemnifying party will not be liable to such
Indemnified Party for any legal or other expenses subsequently incurred by the
latter in connection with the defense thereof other than reasonable costs of
investigation and shall have no liability for any settlement made by the
Indemnified Party without the consent of the indemnifying party, such consent
not to be unreasonably withheld.  No indemnifying party will settle
any action or proceeding or consent to the entry of any judgment without the
prior written consent of the Indemnified Party, unless such settlement or
judgment (i) includes as an unconditional term thereof the giving by the
claimant or plaintiff of a release to such Indemnified Party from all liability
in respect of such action or proceeding and (ii) does not involve the
imposition of equitable remedies or the imposition of any obligations on such
Indemnified Party and does not otherwise adversely affect such Indemnified
Party, other than as a result of the imposition of financial obligations for
which such Indemnified Party will be indemnified hereunder.  An
Indemnified Party may not settle any action or proceeding or the entry of any
judgment without the prior written consent of the indemnifying
party.

     

    (d)        (i) If
the indemnification provided for in this Section 2.09 from the indemnifying
party is unavailable to an Indemnified Party hereunder in respect of any Claim
or expenses referred to herein, then the indemnifying party, in lieu of
indemnifying such indemnified party, shall contribute to the amount paid or
payable by such Indemnified Party as a result of such Claim or expenses in such
proportion as is appropriate to reflect the relative fault of the indemnifying
party and Indemnified Party in connection with the actions which resulted in
such Claim or expenses, as well as any other relevant equitable
considerations.  The relative fault of such indemnifying party and
Indemnified Party shall be determined by reference to, among other things,
whether any action in question, including any untrue or alleged untrue statement
of a material fact or omission or alleged omission to state a material fact, has
been made by, or relates to information supplied by, such indemnifying party or
Indemnified Party, and the parties’ relative intent, knowledge, access to
information and opportunity to correct or prevent such action.  The
amount paid or payable by a party under this Section 2.09(d) as a result of the
Claim and expenses referred to above shall be deemed to include any legal or
other fees or expenses reasonably incurred by such party in connection with any
action or proceeding; and (ii) the parties hereto agree that it would not
be just and equitable if contribution pursuant to this Section 2.09(d) were
determined by pro rata allocation or by any other method of allocation which
does not take account of the equitable considerations referred to in clause (i)
above.  No Person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution
from any Person who was not guilty of such fraudulent
misrepresentation.

    
      
         

      

      
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    (e)       The
obligations of the parties under this Section 2.09 shall be in addition to any
liability which any party may otherwise have to any other party.

     

    Section
2.10.  Selection of
Counsel.  In connection with any registration of Registrable
Securities pursuant to Section 2.01, 2.02, 2.03 or 2.05, the Holders of a
majority of the Registrable Securities covered by any such registration may
select one counsel to represent all Holders of Registrable Securities covered by
such registration; provided
that in the event that the counsel selected as provided above is also
acting as counsel to the Company in connection with such registration, a
majority of the remaining Holders shall be entitled to select one additional
counsel to represent all such remaining Holders.

     

    Section
2.11. No Inconsistent
Agreements; No Free Writing Prospectus.  The Company represents
and warrants that it is not a party to a Contract which conflicts with or limits
or prohibits the exercise of the rights granted to the Holders of Registrable
Securities in this Article 2.  Each Holder agrees that, unless it
obtains the prior consent of the Company and any such underwriter, it will not
make any offer relating to the Securities that would constitute an Issuer Free
Writing Prospectus, or that would otherwise constitute a “free writing
prospectus,” as defined in Rule 405, required to be filed with the
SEC.

     

    Section
2.12.  Termination
of Registration Rights.   The rights of any Holder under this
Article 2 shall terminate (other than Section 2.07, 2.09 and 2.12) at such time
as (a) such Holder ceases to hold any Registrable Securities or (b) either (i)
the Company is no longer required to file reports pursuant to Section 13(a) or
15(d) of the 1934 Act and has ceased to file reports under the 1934 Act, or (ii)
a Form 15 (or any successor form) has been filed under the 1934 Act with respect
to the Common Stock, unless, in the case of clause (b), such situation or filing
is due to the occurrence of any merger, consolidation or other transaction upon
consummation of which the issuer of the Common Stock is an entity other than the
Company, in which event such rights of the Holders shall not terminate at such
time pursuant to such clause (b) and this Agreement shall be assumed by the
Survivor as provided in Section 3.04.

    
      
         

      

      
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    ARTICLE
3

    Transfer
Restrictions; Board Representation

     

    Section
3.01.  Transfer
Restrictions.  Investor shall not sell or transfer, directly or
indirectly, any Purchased Shares which are not Registrable Securities except
pursuant to and in compliance with the 1933 Act.  In addition,
notwithstanding any other provisions of this Agreement, Investor shall not sell
or transfer, directly or indirectly, any Purchased Shares which are not
Registrable Securities to any Third Party until the first anniversary of the
Closing Date.

     

    Section
3.02.  Board
Representation.  It is acknowledged by the parties that
effective as of the Closing Date, Investor shall be entitled to designate four
members (the “Investor
Nominees”) of the Company’s Board of Directors (the “Company
Board”).  The Company and the Company Board will use their best
efforts to cause any Investor Nominees to be elected to the Company Board,
including promptly calling a special meeting of the stockholders of the Company
at the request of Investor and recommending to the stockholders of the Company
that they vote for the election of any Investor Nominees to the Company
Board.  Investor and the Company agree that Investor’s right to
designate four Investor Nominees will terminate upon the earlier of (i) Investor
(together with its Affiliates) ceasing to be the largest individual stockholder
of the Company or (ii) Investor (together with its Affiliates) owning less than
25% of the outstanding shares of Common Stock.

     

    ARTICLE
4

    Miscellaneous

     

    Section
4.01.  Notices.  All
notices, requests and other communications to any party hereunder shall be in
writing (including facsimile transmission) and shall be given,

     

    if to
Investor, to:

     

    Tianwei
New Energy Holdings Co., Ltd.

    No 1,
Tianwei Road,

    Southwest Airport Economic Development Zone,

    Chengdu, China 610200 

    Attention:
Wei Xia

    Facsimile
No.: +86-28-6705-0035

    
      
         

      

      
        -20-

        
          

        

      

      
         

      

    

     

    with a
copy to:

     

    Davis
Polk & Wardwell LLP

    26/F,
Twin Towers West,

    B12, Jian
Guo Men Wai Avenue,

    Chao Yang
District,

    Beijing
100022BG

    Attention:
Howard Zhang

    Facsimile
No.: + 86-10-8567-5123

     

    if to the
Company, to:

     

    Hoku
Scientific, Inc.

    1288 Ala
Moana Blvd., Suite 220

    Honolulu,
Hawaii 96814

    Attention:
Chief Executive Officer

    Facsimile
No.: + 1 808-682-7807

     

    with a
copy to:

     

    Stoel
Rives LLP

    101 S.
Capitol Blvd., Suite 1900

    Boise,
Idaho 83702

    Attention:
Paul M. Boyd

    Facsimile
No.: + 1 208-389-9040

     

    or such
other address or facsimile number as such party may hereafter specify for the
purpose by notice to the other parties hereto.  All such notices,
requests and other communications shall be deemed received on the date of
receipt by the recipient thereof if received prior to 5:00 p.m. in the place of
receipt and such day is a Business Day in the place of
receipt.  Otherwise, any such notice, request or communication shall
be deemed not to have been received until the next succeeding Business Day in
the place of receipt.

     

    Section
4.02. Amendments and
Waivers.  (a) Any provision of this Agreement may be amended or
waived if, but only if, such amendment or waiver is in writing and is signed, in
the case of an amendment, by each party to this Agreement, or in the case of a
waiver, by the party against whom the waiver is to be effective.

     

    (b)       No
failure or delay by any party in exercising any right, power or privilege
hereunder shall operate as a waiver thereof nor shall any single or partial
exercise thereof preclude any other or further exercise thereof or the exercise
of any other right, power or privilege. The rights and remedies herein provided
shall be cumulative and not exclusive of any rights or remedies provided by
law.

    
      
         

      

      
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    Section
4.03.  Expenses.  Except
as otherwise provided herein (and except as provided in the Securities Purchase
Agreement), all expenses incurred in connection with this Agreement and the
transactions contemplated hereby shall be paid by the party incurring such
expenses.

     

    Section
4.04. Successors and Assigns;
Assignment.  Except as otherwise expressly provided herein, the
provisions hereof shall inure to the benefit of, and be binding upon, the
successors, permitted assigns, heirs, executors and administrators of the
parties hereto.  This Agreement may not be assigned without the prior
written consent of the other parties, except that this Agreement (i) may be
assigned by a Holder so long as the Person to whom it is being assigned agrees
to be bound under this Agreement as a Holder hereunder and delivers a
counterpart signature page to this Agreement to the Company and (ii) shall be
assigned by the Company in the event of any merger, consolidation or other
transaction upon consummation of which the issuer of the Common Stock is an
entity other than the Company (such entity, the “Survivor”) to such Survivor,
and the Company shall not enter into any such transaction unless and until the
Survivor assumes all rights and obligations of the Company hereunder pursuant to
a written agreement for the benefit of the Holders (it being understood that if
the Survivor is the issuer of the Common Stock and such assumption of the rights
and obligations of the Company hereunder occurs by operation of law, that such
Survivor shall not be required to execute a written agreement for the benefit of
the Holders).

     

    Section
4.05.  No Third
Party Beneficiaries.  Except as specifically provided in Section
2.09 (with respect to which the Indemnified Parties named therein shall be
express, intended third party beneficiaries of such provision), this Agreement
is not intended, and shall not be deemed, to confer any rights or remedies upon
any Person other than the parties hereto or otherwise create any third-party
beneficiary hereto.

     

    Section
4.06.  Governing
Law.  This Agreement shall be governed by and construed in
accordance with the law of the State of New York, without regard to the
conflicts of law rules of such state.

     

    Section
4.07.  Jurisdiction.  The
parties hereto agree that any suit, action or proceeding seeking to enforce any
provision of, or based on any matter arising out of or in connection with, this
Agreement or the transactions contemplated hereby shall be brought in the United
States District Court for the Southern District of New York or any New York
State court sitting in New York City, so long as one of such courts shall have
subject matter jurisdiction over such suit, action or proceeding, and that any
cause of action arising out of this Agreement shall be deemed to have arisen
from a transaction of business in the State of New York, and each of the parties
hereby irrevocably consents to the jurisdiction of such courts (and of the
appropriate appellate courts therefrom) in any such suit, action or proceeding
and irrevocably waives, to the fullest extent permitted by law, any objection
that it may now or hereafter have to the laying of the venue of any such suit,
action or proceeding in any such court or that any such suit, action or
proceeding brought in any such court has been brought in an inconvenient
forum.  Process in any such suit, action or proceeding may be served
on any party anywhere in the world, whether within or without the jurisdiction
of any such court.  Without limiting the foregoing, each party agrees
that service of process on such party as provided in Section
4.01 shall be deemed effective service of process on such
party.

    
      
         

      

      
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    Section
4.08.  WAIVER OF
JURY TRIAL.  EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY
WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF
OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED
HEREBY.

     

    Section
4.09.  Counterparts;
Effectiveness.  This Agreement may be signed in any number of
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.  This
Agreement shall become effective when each party hereto shall have received a
counterpart hereof signed by all of the other parties hereto.  Until
and unless each party has received a counterpart hereof signed by the other
party hereto, this Agreement shall have no effect and no party shall have any
right or obligation hereunder (whether by virtue of any other oral or written
agreement or other communication).

     

    Section
4.10. Entire
Agreement.  This Agreement and the other agreements or documents
referred to herein, constitutes the entire agreement between the parties with
respect to the subject matter of this Agreement and supersedes all prior
agreements and understandings, both oral and written, between the parties with
respect to the subject matter of this Agreement.

     

    Section
4.11.  Severability.  If
any term, provision, covenant or restriction of this Agreement is held by a
court of competent jurisdiction or other Governmental Authority to be invalid,
void or unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall remain in full force and effect and shall
in no way be affected, impaired or invalidated so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
materially adverse to any party.  Upon such a determination, the
parties shall negotiate in good faith to modify this Agreement so as to effect
the original intent of the parties as closely as possible in an acceptable
manner in order that the transactions contemplated hereby be consummated as
originally contemplated to the fullest extent possible.

    
      
         

      

      
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    Section
4.12.  Specific
Performance.  The parties hereto agree that irreparable damage
would occur if any provision of this Agreement were not performed in accordance
with the terms hereof and that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement or to enforce specifically the
performance of the terms and provisions hereof in the United States District
Court for the Southern District of New York or any New York State court sitting
in New York City, in addition to any other remedy to which they are entitled at
law or in equity.

     

    [Remainder
of Page Intentionally Left Blank.]

    
      
         

      

      
        -24-

        
          

        

      

      
         

      

    

    IN
WITNESS WHEREOF, the parties hereto have executed this Investor Rights Agreement
as of the date first set forth above.

     

    
      
        	
                HOKU
      SCIENTIFIC, INC.

              
	 
      	 
      
	
                By:

              	
                /s/
      Dustin M. Shindo

              
	 
      	 
      
	 
      	
                Title:
      President and CEO

              
	 
      	 
      
	
                TIANWEI
      NEW ENERGY HOLDINGS

                CO.,
      LTD.

              
	 
      	 
      
	
                By:

              	
                /s/
      Qiang Ding

              
	 
      	 
      
	 
      	
                Title:
      Legal Representative

              

      

    

    

    [Signature
page to Investor Rights Agreement]

    
      
         

      

      
        
        

        
          

        

      

      
         

      

    

    By
executing this Investor Rights Agreement, the undersigned is agreeing to the
rights and obligations of a “Holder” hereunder.

     

    
      
        
          
            
              
                
                  
                    
                      
                        
                          
                            
                              
                                
                                  
                                    
                                      
                                        
                                          
                                            
                                              
                                                
                                                  
                                                    
                                                      	
                                                              HOLDER

                                                            
	 
      	 
      
	Name
      of Holder:	  
	 
      	 
      
	
                                                              By:

                                                            	 
      
	
                                                              Name:

                                                            	 
      
	
                                                              Title:

                                                            	 
      
	 
      	 
      
	
                                                              Date:

                                                            	 
      
	 
      	 
      
	
                                                              Address:

                                                            	 
	 
      	 
      
	 
      	 
      

                                                    

                                                  

                                                

                                              

                                            

                                          

                                        

                                      

                                    

                                  

                                

                              

                            

                          

                        

                      

                    

                  

                

              

            

          

        

      

    

     

    [Signature page to Investor Rights
Agreement]Exhibit
4.6

    Form of Lock-up
Agreement

     

    December
22, 2009

     

    Tianwei
New Energy Holdings Co., Ltd.

    No 1,
Tianwei Road,

    Southwest Airport Economic Development Zone,

    Chengdu, China 610200 

    Attention:
Wei Xia

    

    Re: Hoku Scientific, Inc. –
Lock-up Agreement/(Name of Officer)

     

    Ladies
and Gentlemen:

     

    The
undersigned understands that Tianwei New Energy Holdings Co., Ltd. (“Buyer”) has entered into a
Securities Purchase Agreement (the “SPA”) with Hoku Scientific,
Inc., a Delaware corporation (the “Company”), pursuant to which
the Company will issue and sell to Buyer (i) 33,379,287 newly-issued shares of
Common Stock, par value $0.001 per share, of the Company (the “Common Stock”) and (ii)
warrants for the purchase of 10,000,000 shares of Common Stock.

     

    As a
condition and inducement to Buyer’s willingness to consummate the transactions
contemplated by the SPA, the undersigned hereby agrees that, without the prior
written consent of Buyer, it will not, during the period commencing on the
Closing Date (as defined in the SPA) and ending on the first anniversary of the
Closing Date (the “Lock-up
Period”), (1) offer, pledge, sell, contract to sell, sell any option or
contract to purchase, purchase any option or contract to sell, grant any option,
right or warrant to purchase, lend, or otherwise transfer or dispose of,
directly or indirectly, any shares of the Common Stock or any securities
convertible into or exercisable or exchangeable for the Common Stock or any
interest in the foregoing or (2) enter into any swap or other arrangement that
transfers to another, in whole or in part, any of the economic consequences of
ownership of any share of the Common Stock, whether now owned or hereinafter
acquired, owned directly by the undersigned (including holding as a custodian)
or with respect to which the undersigned has beneficial ownership within the
rules and regulations of the U.S. Securities and Exchange Commission, and
whether any such transaction described in clause (1) or (2) above is to be
settled by delivery of the Common Stock or other securities, in cash or
otherwise. The foregoing sentence shall not apply to (i) sales of shares of
Common Stock on a systematic basis pursuant to the stock sale plan adopted,
implemented and effected on [date] in accordance with the requirements of Rule
10b5-1(c)(1) of the Securities Exchange Act of 1934, as amended, a copy of which
is attached hereto as Exhibit A (the “10b5-1 Plan”) or (ii)
transfers of Common Stock to a trust for the direct or indirect benefit of the
undersigned or his or her immediate family, provided that prior to such
transfer, the trustee of such trust agrees in writing to be bound by the
restrictions set forth herein.  For the avoidance of doubt, the
undersigned shall not enter into any new stock sale plan or amend the 10b5-1
Plan during the Lock-up Period other than to terminate all sales under the
10b5-1 Plan.

     

    
      
        
        

      

      
        
        

        
          

        

      

      
        
        

      

    

     

    The
undersigned understands that Buyer is relying upon this Lock-up Agreement in
proceeding toward consummation of the transactions contemplated by the
SPA.  The undersigned further understands that this Lock-up Agreement
is irrevocable and shall be binding upon the undersigned’s heirs, legal
representatives, successors and assigns.

     

    This
Lock-up Agreement shall terminate upon the expiration of the Lock-up Period, or,
if for any reason the SPA shall be terminated prior to the Closing Date, this
Lock-up Agreement shall likewise be terminated.

     

    
      
        
          
            	
                    Very
      truly yours,

                  
	 
	 
      
	
                    Name:

                  
	
                    Title:

                  

          

        

      

    

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    EXHIBIT
A

    

    STOCK
SALE PLAN

    (NAME
OF OFFICER)

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