KNIGHT TRIMARK GROUP INC
S-1/A, 1999-02-25
SECURITY BROKERS, DEALERS & FLOTATION COMPANIES
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<PAGE>
 
    
 As filed with the Securities and Exchange Commission on February 25, 1999     
                                                      Registration No. 333-71559
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                ---------------
                                 
                              AMENDMENT NO. 3     
                                       TO
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                                ---------------
                           KNIGHT/TRIMARK GROUP, INC.
             (Exact name of Registrant as specified in its charter)
 
                                ---------------
       Delaware                       6211                  52-2096335

   (State or other      (Primary Standard Industrial     (I.R.S. Employer       
    jurisdiction         Classification Code Number)   Identification Number) 
   of incorporation                                      
   or organization)        
                      
 
                          Newport Tower, 29th Floor 
                          525 Washington Boulevard 
                        Jersey City, New Jersey 07310 
                                (201) 222-9400
 (Address, including zip code, and telephone number, including area code, of
                  Registrant's principal executive offices)
 
                                ---------------
 
                           Michael T. Dorsey, Esq. 
                  Senior Vice President and General Counsel
                         Knight/Trimark Group, Inc. 
                          Newport Tower, 29th Floor 
                           525 Washington Boulevard
                        Jersey City, New Jersey 07310 
                                (201) 222-9400
(Name, address, including zip code, and telephone number, including area code,
                            of agent for service)
 
                                ---------------
                                   Copies to:
         Matthew J. Mallow, Esq.                  Alexander D. Lynch, Esq. 
Skadden, Arps, Slate, Meagher & Flom LLP             Babak Yaghmaie, Esq.
           919  Third Avenue                   Brobeck, Phleger & Harrison LLP
       New York, New York 10022                   1633 Broadway, 47th Floor
            (212) 735-3000                        New York, New York 10019
                                                       (212) 581-1600
 
                                ---------------
  Approximate date of commencement of proposed sale to the public: As soon as
practicable after the effective date of this Registration Statement.
 
  If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. [_]
 
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [_]
 
  If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
  If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.
 
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]
 
  The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until this Registration Statement shall become
effective on such date as the Securities and Exchange Commission, acting
pursuant to said Section 8(a), may determine.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                                      PART II
 
                       INFORMATION NOT REQUIRED IN PROSPECTUS
 
Item 13. Other Expenses of Issuance and Distribution
 
    The expenses of the offering are estimated to be as follows:
 
<TABLE>
      <S>                                                              <C>
      Securities and Exchange Commission Registration Fee............. $130,572
      NASD filing fee.................................................   30,500
      Nasdaq listing fee..............................................   17,500
      Legal fees and expenses.........................................  300,000
      Accounting fees and expenses....................................  150,000
      Blue Sky fees and expenses (including legal fees)...............   10,000
      Printing expenses...............................................  200,000
      Transfer Agent fees.............................................   25,000
      Miscellaneous...................................................   86,428
                                                                       --------
        TOTAL......................................................... $950,000
                                                                       ========
</TABLE>
 
Item 14. Indemnification of Directors and Officers
 
    The Company, a Delaware corporation, is empowered by Section 145 of the
Delaware General Corporation Law (the DGCL), subject to the procedures and
limitations stated therein, to indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding by reason of the fact that such person is or was a director,
officer, employee or agent of the Company, or is or was serving at the request
of the Company as a director, officer, employee or agent of another corporation
or other enterprise, against reasonable expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually incurred by him in
connection with such action, suit or proceeding, if such director, officer,
employee or agent acted in good faith and in a manner he reasonably believed to
be in or not opposed to the best interests of the Company and, with respect to
any criminal action or proceeding, had no reasonable cause to believe his
conduct was unlawful. The Company is required by Section 145 to indemnify any
person against reasonable expenses (including attorneys' fees) actually
incurred by him in connection with an action, suit or proceeding in which he is
a party because he is or was a director, officer, employee or agent of the
Company or is or was serving at the request of the Company as a director,
officer, employee or agent of another corporation or other enterprise, if he
has been successful, on the merits or otherwise, in the defense of the action,
suit or proceeding. Section 145 also allows a corporation to purchase and
maintain insurance on behalf of any such person against any liability asserted
against him in any such capacity, or arising out of his status as such, whether
or not the corporation would have the power to indemnify him against such
liability under the provisions of Section 145. In addition, Section 145
provides that indemnification pursuant to its provisions is not exclusive of
other rights of indemnification to which a person may be entitled under any
bylaw, agreement, vote of shareholders or disinterested directors, or
otherwise.
 
    Article 7 of the Company's Certificate of Incorporation (the Charter)
provides that the Company shall indemnify and hold harmless any person who was,
is or is threatened to be made a party to a proceeding by reason of the fact
that he or she (i) is or was a director or officer of the Company or (ii) while
a director or officer of the Company, is or was serving at the request of the
Company as a director, officer, partner, venturer, proprietor, trustee,
employee, agent, or similar functionary of another foreign or domestic
corporation, partnership, joint venture, sole proprietorship, trust, employee
benefit plan or other enterprise, to the fullest extent permitted under the
DGCL. The right to indemnification under Article 7 of the Charter is a contract
right which includes, with respect to directors and officers, the right to be
paid by the Company the expenses incurred in defending any such proceeding in
advance of its disposition.
 
                                      II-1
<PAGE>
 
Item 15. Recent Sales of Unregistered Securities
 
    On March 27, 1995, Roundtable Partners, L.L.C. (the LLC) sold an aggregate
of 304,407 common units of the LLC (Common Units) to 22 investors, at a price
of $10.00 per unit, for an aggregate purchase price of $3,044,070. The LLC also
sold an aggregate of 1,095,864 Series A preferred units of the LLC (Series A
Preferred Units) to 18 investors, at a price of $10.00 per unit, for an
aggregate purchase price of $10,958,640. In addition, on such date, the LLC
sold an aggregate of 1,500,000 Series B preferred units of the LLC to Trimark
Securities, Inc., at a price of $10.00 per unit, for an aggregate purchase
price of $15.0 million.
 
    On June 28, 1995, the LLC sold an aggregate of 23,331 Common Units to five
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$233,310. The LLC also sold an aggregate of 83,992 Series A Preferred Units to
a single investor, at a price of $10.00 per unit, for an aggregate purchase
price of $839,920.
 
    On July 26, 1995, the LLC sold an aggregate of 33,574 Common Units to eight
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$335,740. The LLC also sold an aggregate of 120,866 Series A Preferred Units to
four investors, at a price of $10.00 per unit, for an aggregate purchase price
of $1,208,660.
 
    On October 25, 1995, the LLC sold an aggregate of 7,167 Common Units to six
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$71,670. The LLC also sold an aggregate of 25,800 Series A Preferred Units to
two investors, at a price of $10.00 per unit, for an aggregate purchase price
of $258,000.
 
    On November 29, 1995, the LLC sold an aggregate of 1,190 Common Units, at a
price of $10.00 per unit, for an aggregate purchase price of $11,900. The LLC
also sold an aggregate of 4,284 Series A Preferred Units, at a price of $10.00
per unit, for an aggregate purchase price of $42,840.
 
    On December 27 1995, the LLC sold an aggregate of 2,979 Common Units to six
investors, at a purchase price of $10.00 per unit, for an aggregate purchase
price of $29,790. The LLC also sold an aggregate of 10,724 Series A Preferred
Units to two investors, at a price of $10.00 per unit, for an aggregate
purchase price of $107,240.
 
    On January 1, 1996, the LLC sold an aggregate of 120,849 Common Units to
five investors, at a price of $10.00 per unit, for an aggregate purchase price
of $1,208,490. The LLC also sold an aggregate of 435,056 Series A Preferred
Units to a single investor, at a price of $10.00 per unit, for an aggregate
purchase price of $4,350,560.
 
    On January 24, 1996, the LLC sold an aggregate of 1,699 Common Units to
five investors, at a price of $10.00 per unit, for an aggregate purchase price
of $16,990. The LLC also sold an aggregate of 6,116 Series A Preferred Units to
a single investor, at a price of $10.00 per unit, for an aggregate purchase
price of $61,160.
 
    On February 21, 1996, the LLC sold an aggregate of 1,783 Common Units to
five investors, at a price of $10.00 per unit, for an aggregate purchase price
of $17,830. The LLC also sold an aggregate of 6,418 Series A Preferred Units to
a single investor, at a price of $10.00 per unit, for an aggregate purchase
price of $64,180.
 
    On March 27, 1996, the LLC sold an aggregate of 1,190 Common Units to six
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$11,900. The LLC sold an aggregate of 4,284 Series A Preferred Units to two
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$42,840.
 
    On April 24, 1996, the LLC sold an aggregate of 4,189 Common Units to five
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$41,890. The LLC also sold an aggregate of 15,080 Series A Preferred Units to a
single investor, at a price of $10.00 per unit, for an aggregate purchase price
of $150,800.
 
    On May 29, 1996, the LLC sold an aggregate of 60,160 Common Units to seven
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$601,600. The LLC also sold an aggregate of 216,575 Series A Preferred Units to
three investors, at a price of $10.00 per unit, for an aggregate purchase price
of $2,165,750.
 
 
                                      II-2
<PAGE>
 
    On June 26, 1996, the LLC sold an aggregate of 29,809 Common Units to 10
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$298,090. The LLC also sold an aggregate of 107,312 Series A Preferred Units to
six investors, at a price of $10.00 per unit, for an aggregate purchase price
of $1,073,120.
 
    On July 24, 1996, the LLC sold an aggregate of 12,001 Common Units to seven
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$120,010. The LLC also sold an aggregate of 43,203 Series A Preferred Units to
three investors, at a price of $10.00 per unit, for an aggregate purchase price
of $432,030.
 
    On October 1, 1996, the LLC sold an aggregate of 133,769 Common Units to 12
investors, at a price of $10.00 per unit, for an aggregate purchase price of
$1,337,690. The LLC also sold an aggregate of 481,568 Series A Preferred Units
to eight investors, at a price of $10.00 per unit, for an aggregate purchase
price of $4,815,680.
 
    In January 1999, the Company sold 20,000 shares of Class A Common Stock to
one investor, upon exercise of options awarded under the Company's 1998 Long-
Term Incentive Plan at a price of $14.50 per share for an aggregate purchase
price of $290,000.
 
Item 16. Exhibits and Financial Statement Schedules
 
    (a) Exhibits:
 
<TABLE>   
 <C>    <S>
   1.1  Form of Underwriting Agreement.
  *3.1  Form of Amended and Restated Certificate of Incorporation of the
        Registrant.
  *3.2  Form of Amended and Restated Bylaws of the Registrant.
  *4.1  Specimen Common Stock certificate.
  *4.2  Form of Registration Rights Agreement, dated as of July 13, 1998.
 **5.1  Opinion of Michael T. Dorsey, General Counsel of the Registrant.
 *10.1  Clearing Agreement between Knight Securities, L,P. and Correspondent
        Services Corporation, dated April 23, 1997.
 *10.2  Clearing Agreement between Trimark Securities, L.P. and National
        Investor Service Corporation, dated June 29, 1997.
 *10.3  Lease Agreement between Newport L.P., Inc. and Knight Securities, L.P.
        dated December 6, 1994 (the Knight Lease Agreement) for office space
        situated in Newport Office Tower, 525 Washington Boulevard, Jersey
        City, New Jersey 07310.
 *10.4  Amendment to the Knight Lease Agreement, dated May 28, 1996.
 *10.5  Second Amendment to the Knight Lease Agreement, dated September 30,
        1997.
 *10.6  Third Amendment to the Knight Lease Agreement, dated March 18, 1998.
 *10.7  Lease Agreement between Nestle USA, Inc. and Trimark Securities L.P.,
        dated March 20, 1996, for the office space situated at 100
        Manhattanville Road, Purchase, New York 10577.
 *10.8  License Agreement between Automated Securities Clearance, Ltd. and
        Knight Securities, L.P., dated April 5, 1995.
 *10.9  Master Program Product License Agreement between TCAM Systems, Inc.
        and Trimark Securities, Inc. dated May 1, 1990.
 *10.10 Form of Employment Agreement between the Registrant and Kenneth
        Pasternak.
 *10.11 Form of Employment Agreement between the Registrant and Walter Raquet.
 *10.12 Form of Employment Agreement between the Registrant and Steven
        Steinman.
 *10.13 Form of Employment Agreement between the Registrant and Robert
        Lazarowitz.
 *10.14 Form of Employment Agreement between the Registrant and Anthony
        Sanfilippo.
 *10.15 Form of Registrant's 1998 Stock Option and Award Plan.
 *10.16 Form of Registrant's 1998 Nonemployee Director Stock Option Plan.
 *10.17 Form of Registrant's Management Incentive Performance Plan.
 *10.18 Loan Agreement between PaineWebber Capital Inc. and Roundtable
        Partners, L.L.C. dated June 19, 1998.
 * 21.1 Subsidiaries of the Registrant.
</TABLE>    
 
                                      II-3
<PAGE>
 
<TABLE>   
 <C>    <S>
   23.1 Consent of PricewaterhouseCoopers LLP.
 **23.2 Consent of Michael T. Dorsey, General Counsel of the Registrant
        (contained in Exhibit 5.1 hereto).
 **24.1 Powers of Attorney.
 **27   Financial Data Schedule.
</TABLE>    
- --------
 *  Previously filed as an exhibit to the Registrant's Registration Statement
    on Form S-1 (No. 333-51653) and incorporated herein by reference thereto.
** Previously filed.
       
(b) Consolidated Financial Statement Schedules
 
    All schedules are omitted because the required information is inapplicable
or the information is presented in the Consolidated Financial Statements or
related notes.
 
Item 17.  Undertakings
 
    Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that, in the opinion of the SEC, such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the Registrant of expenses incurred or
paid by a director, officer or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question of whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed
by the final adjudication of such issue.
 
    The undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing specified in the underwriting agreement certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser
 
    The undersigned Registrant hereby undertakes that:
 
    (1) For purposes of determining any liability under the Securities Act,
  the information omitted from the form of prospectus filed as part of this
  Registration Statement in reliance upon Rule 430A and contained in a form
  of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
  497(h) under the Securities Act shall be deemed to be part of this
  Registration Statement as of the time it was declared effective.
 
    (2) For the purpose of determining any liability under the Securities
  Act, each post-effective amendment that contains a form of prospectus
  shall be deemed to be a new registration statement relating to the
  securities offered therein, and the offering of such securities at that
  time shall be deemed to be the initial bona fide offering thereof.
 
                                      II-4
<PAGE>
 
                                   SIGNATURES
   
    Pursuant to the requirements of the Securities Act, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-1 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Jersey City, State of New Jersey, on this 25th day
of February, 1999.     
 
                                          Knight/Trimark Group, Inc.
                                                    
                                                 /s/ Walter F. Raquet     
                                          By___________________________________
                                               
                                                Name:Walter F. Raquet
                                               
                                            Title: Director     
                                                     
                                                  and Executive Vice President
                                                      
    Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed by the following persons in the capacities and on the
date indicated.
 
<TABLE>   
<CAPTION>
                Name                             Title                    Date
                ----                             -----                    ----
<S>                                  <C>                           <C>
     /s/  Kenneth D. Pasternak       Director, President and       February 25, 1999
____________________________________  Chief Executive Officer
        Kenneth D. Pasternak        

       /s/  Robert I. Turner         Director, Executive Vice      February 25, 1999
____________________________________  President and Chief
          Robert I. Turner            Financial Officer
                                      (principal financial and
                                      accounting officer)

       /s/ Steven L. Steinman        Director and Chairman of the  February 25, 1999
____________________________________  Board
         Steven L. Steinman         
                                    
        /s/ Walter F. Raquet         Director and Executive Vice   February 25, 1999
____________________________________  President
          Walter F. Raquet          
                                    
      /s/ Robert M. Lazarowitz       Director and Executive Vice   February 25, 1999
____________________________________  President
        Robert M. Lazarowitz        
                                    
     /s/ Anthony M. Sanfilippo       Director and Executive Vice   February 25, 1999
____________________________________  President
       Anthony M. Sanfilippo        
                                    
</TABLE>    
 
                                      II-5
<PAGE>
 
<TABLE>   
<S>                                  <C>                           <C>
                                     Director                      February 25, 1999
        /s/ Martin Averbuch
____________________________________
          Martin Averbuch
                                     Director                      February 25, 1999
       /s/ Charles V. Doherty
____________________________________
         Charles V. Doherty
                                     Director                      February 25, 1999
          /s/ Gene L. Finn
____________________________________
            Gene L. Finn
                                     Director                      February 25, 1999
        /s/ Gary R. Griffith
____________________________________
          Gary R. Griffith
                                     Director                      February 25, 1999
        /s/ Bruce R. McMaken
____________________________________
          Bruce R. McMaken
        /s/ J. Joe Ricketts          Director                      February 25, 1999
____________________________________
          J. Joe Ricketts
                                     Director                      February 25, 1999
        /s/ Rodger O. Riney
____________________________________
          Rodger O. Riney
                                     Director                      February 25, 1999
         /s/ V. Eric Roach
____________________________________
           V. Eric Roach
                                     Director                      February 25, 1999
       /s/ Charles A. Zabatta
____________________________________
         Charles A. Zabatta

   /s/ Walter F. Raquet                                          February 25,
By: ____________________________                                 1999 
      Walter F. Raquet 
       As Attorney-in-Fact

</TABLE>      

 
                                      II-6
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>   
 <C>     <S>
    1.1  Form of Underwriting Agreement.
   *3.1  Form of Amended and Restated Certificate of Incorporation of the
          Registrant.
   *3.2  Form of Amended and Restated Bylaws of the Registrant.
   *4.1  Specimen Common Stock certificate.
   *4.2  Form of Registration Rights Agreement, dated as of July 13, 1998.
  **5.1  Opinion of Michael T. Dorsey, General Counsel of the Company.
  *10.1  Clearing Agreement between Knight Securities, L,P. and Correspondent
          Services Corporation, dated April 23, 1997.
  *10.2  Clearing Agreement between Trimark Securities, L.P. and National
          Investor Service Corporation, dated June 29, 1997.
  *10.3  Lease Agreement between Newport L.P., Inc. and Knight Securities, L.P.
          dated December 6, 1994 (the Knight Lease Agreement) for office space
          situated in Newport Office Tower, 525 Washington Boulevard, Jersey
          City, New Jersey 07310.
  *10.4  Amendment to the Knight Lease Agreement, dated May 28, 1996.
  *10.5  Second Amendment to the Knight Lease Agreement, dated September 30,
          1997.
  *10.6  Third Amendment to the Knight Lease Agreement, dated March 18, 1998.
  *10.7  Lease Agreement between Nestle USA, Inc. and Trimark Securities L.P.,
          dated March 20, 1996, for the office space situated at 100
          Manhattanville Road, Purchase, New York 10577.
  *10.8  License Agreement between Automated Securities Clearance, Ltd. and
          Knight Securities, L.P., dated April 5, 1995.
  *10.9  Master Program Product License Agreement between TCAM Systems, Inc.
          and Trimark Securities, Inc. dated May 1, 1990.
  *10.10 Form of Employment Agreement between the Registrant and Kenneth
          Pasternak.
  *10.11 Form of Employment Agreement between the Registrant and Walter Raquet.
  *10.12 Form of Employment Agreement between the Registrant and Steven
          Steinman.
  *10.13 Form of Employment Agreement between the Registrant and Robert
          Lazarowitz.
  *10.14 Form of Employment Agreement between the Registrant and Anthony
          Sanfilippo.
  *10.15 Form of Registrant's 1998 Stock Option and Award Plan.
  *10.16 Form of Registrant's 1998 Nonemployee Director Stock Option Plan.
  *10.17 Form of Registrant's Management Incentive Performance Plan.
  *10.18 Loan Agreement between PaineWebber Capital Inc. and Roundtable
          Partners, L.L.C. dated June 19, 1998.
  *21.1  Subsidiaries of the Registrant.
   23.1  Consent of PricewaterhouseCoopers LLP.
 **23.2  Consent of Michael T. Dorsey, General Counsel of the Company
          (contained in Exhibit 5.1 hereto).
 **24.1  Powers of Attorney.
 **27    Financial Data Schedule.
</TABLE>    
- --------
 *  Previously filed as an exhibit to the Registrant's Registration Statement
    on Form S-1 (No. 333-51653) and incorporated herein by reference thereto.
** Previously filed.

<PAGE>
 
                                                                     EXHIBIT 1.1
                                                                                

                              9,000,000 shares/1/

                          KNIGHT/TRIMARK GROUP, INC.

                                 Common Stock

                            UNDERWRITING AGREEMENT
                            ----------------------

                                                               February __, 1999

BANCBOSTON ROBERTSON STEPHENS INC.
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
PAINEWEBBER INCORPORATED
ABN AMRO INCORPORATED
SOUTHWEST SECURITIES, INC.
 As Representatives of the several Underwriters
c/o BancBoston Robertson Stephens
555 California Street
Suite 2600
San Francisco, California  94104

Ladies/Gentlemen:

          KNIGHT/TRIMARK GROUP, INC., a Delaware corporation (the "Company"),
and certain stockholders of the Company named in Schedule B hereto (hereafter
                                                 ----------                  
called the "Selling Stockholder") address you as the Representatives of each of
the persons, firms and corporations listed in Schedule A hereto (herein
                                              ----------               
collectively called the "Underwriters") and hereby confirm their respective
agreements with the several Underwriters as follows:

      1.  Description of Shares.  The Company proposes to issue and sell 
          --------------------- 
2,400,000 shares of its authorized and unissued Class A Common Stock, $0.01 par
value, to the several Underwriters. The Selling Stockholders, acting severally
and not jointly, propose to sell an aggregate of 6,600,000 shares of the
Company's issued and outstanding Class A Common Stock, $.01 par value, and each
such Selling Stockholder proposes to sell such number of shares of the Company's
authorized and outstanding Class A Common Stock, $.01 par value, as set forth
opposite such Selling Stockholder's name on Schedule B hereto, to the several
                                            ----------                       
Underwriters.  The 2,400,000 shares of Class A Common Stock, $.01 par value, of
the Company to be sold by the Company are hereinafter called the "Company
Shares" and the shares of Class A Common Stock, $0.01 par value, to be sold by
the Selling Stockholders are hereinafter called the "Selling Stockholder
Shares."  The Company Shares and the Selling Stockholder Shares are hereinafter
collectively referred to as the "Firm Shares."  Certain Selling Stockholders
also propose to grant to the Underwriters an option to purchase up to 1,350,000
additional shares of the Company's Class A Common Stock, $0.01 par value (the
"Option Shares"), as provided in Section 7 hereof.  As used in this Agreement,
the term "Shares" shall include the Firm Shares and the Option Shares.  All
shares of Class A Common Stock, $0.01 par value, of the Company to be
outstanding after giving effect to the sales contemplated hereby, including the
Shares, are hereinafter referred to as "Common Stock."




__________________________
      
      /1/ Plus an option to purchase up to 1,350,000 additional shares from 
certain Selling Stockholders to cover over-allotments.


<PAGE>
 
      2.  Representations, Warranties and Agreements of the Company and the 
          ------------------------------------------------------------------
          Selling Stockholders.
          -------------------- 

          I.  The Company represents and warrants to and agrees with each
Underwriter and the Selling Stockholders that:

              (a)  A registration statement on Form S-1 (File No. 333-71559)
with respect to the Shares, including a prospectus subject to completion, has
been prepared by the Company in conformity with the requirements of the
Securities Act of 1933, as amended (the "Act"), and the applicable rules and
regulations (the "Rules and Regulations") of the Securities and Exchange
Commission (the "Commission") under the Act and has been filed with the
Commission; such amendments to such registration statement, such amended
prospectuses subject to completion and such abbreviated registration statements
pursuant to Rule 462(b) of the Rules and Regulations as may have been required
prior to the date hereof have been similarly prepared and filed with the
Commission; and the Company will file such additional amendments to such
registration statement, such amended prospectuses subject to completion and such
abbreviated registration statements as may hereafter be required. Copies of such
registration statement and amendments, of each related prospectus subject to
completion (the "Preliminary Prospectuses") and of any abbreviated registration
statement pursuant to Rule 462(b) of the Rules and Regulations have been
delivered to you.

          If the registration statement relating to the Shares has been declared
effective under the Act by the Commission, the Company will prepare and promptly
file with the Commission the information omitted from the registration statement
pursuant to Rule 430A(a) or, if BancBoston Robertson Stephens, on behalf of the
several Underwriters, shall agree to the utilization of Rule 434 of the Rules
and Regulations, the information required to be included in any term sheet filed
pursuant to Rule 434(b) or (c), as applicable, of the Rules and Regulations
pursuant to subparagraph (1), (4) or (7) of Rule 424(b) of the Rules and
Regulations or as part of a post-effective amendment to the registration
statement (including a final form of prospectus).  If the registration statement
relating to the Shares has not been declared effective under the Act by the
Commission, the Company will prepare and promptly file an amendment to the
registration statement, including a final form of prospectus, or, if BancBoston
Robertson Stephens, on behalf of the several Underwriters, shall agree to the
utilization of Rule 434 of the Rules and Regulations, the information required
to be included in any term sheet filed pursuant to Rule 434(b) or (c), as
applicable, of the Rules and Regulations.  The term "Registration Statement" as
used in this Agreement shall mean such registration statement, including
financial statements, schedules and exhibits, in the form in which it became or
becomes, as the case may be, effective (including, if the Company omitted
information from the registration statement pursuant to Rule 430A(a) or files a
term sheet pursuant to Rule 434 of the Rules and Regulations, the information
deemed to be a part of the registration statement at the time it became
effective pursuant to Rule 430A(b) or Rule 434(d) of the Rules and Regulations)
and, in the event of any amendment thereto or the filing of any abbreviated
registration statement pursuant to Rule 462(b) of the Rules and Regulations
relating thereto after the effective date of such registration statement, shall
also mean (from and after the effectiveness of such amendment or the filing of
such abbreviated registration statement) such registration statement as so
amended, together with any such abbreviated registration statement.  The term
"Prospectus" as used in this Agreement shall mean the prospectus relating to the
Shares as included in such Registration Statement at the time it becomes
effective (including, if the Company omitted information from the Registration
Statement pursuant to Rule 430A(a) of the Rules and Regulations, the information
deemed to be a part of the Registration Statement at the time it became
effective pursuant to Rule 430A(b) of the Rules and Regulations); provided,
                                                                  -------- 
however, that if in reliance on Rule 434 of the Rules and Regulations and with
- -------                                                                       
the consent of BancBoston Robertson Stephens, on behalf of the several
Underwriters, the Company shall have provided to the Underwriters a term sheet
pursuant to Rule 434(b) or (c), as applicable, prior to the time that a
confirmation is sent or given for purposes of Section 2(10)(a) of the Act, the
term "Prospectus" shall mean the "prospectus subject to completion" (as defined
in Rule 434(g) of the Rules and Regulations) last provided to the Underwriters
by the Company and circulated by the Underwriters to all prospective purchasers
of the Shares (including the information deemed to be a part of the Registration
Statement at the time it became effective pursuant to Rule 434(d) of the Rules
and Regulations).  Notwithstanding the foregoing, if any revised prospectus
shall be provided to the Underwriters by the Company for use in connection with
the offering of the Shares that differs from the prospectus referred to in the
immediately preceding sentence (whether or not such revised prospectus is
required to be filed with the Commission pursuant to Rule 424(b) of the Rules
and Regulations), the term "Prospectus" shall refer to such revised prospectus
from and after the time it is first provided to the Underwriters for such use.
If in reliance on Rule 434 of the Rules and Regulations and with the consent of
BancBoston Robertson Stephens, on behalf of the several Underwriters, the
Company shall have provided to the 

                                       2
<PAGE>
 
Underwriters a term sheet pursuant to Rule 434(b) or (c), as applicable, prior
to the time that a confirmation is sent or given for purposes of Section
2(10)(a) of the Act, the Prospectus and the term sheet, together, will not be
materially different from the prospectus in the Registration Statement.

              (b)  The Commission has not issued any order preventing or
suspending the use of any Preliminary Prospectus or instituted proceedings for
that purpose, and each such Preliminary Prospectus has conformed in all material
respects to the requirements of the Act and the Rules and Regulations and, as of
its date, has not included any untrue statement of a material fact or omitted to
state a material fact necessary to make the statements therein, in the light of
the circumstances under which they were made, not misleading; and at the time
the Registration Statement became or becomes, as the case may be, effective and
at all times subsequent thereto up to and on the Closing Date (hereinafter
defined) and on any later date on which Option Shares are to be purchased, (i)
the Registration Statement and the Prospectus, and any amendments or supplements
thereto, contained and will contain all material information required to be
included therein by the Act and the Rules and Regulations and will in all
material respects conform to the requirements of the Act and the Rules and
Regulations, (ii) the Registration Statement, and any amendments or supplements
thereto, did not and will not include any untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements therein not misleading, and (iii) the Prospectus, and any
amendments or supplements thereto, did not and will not include any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements therein, in the light of the circumstances under which they were
made, not misleading; provided, however, that none of the representations and
warranties contained in this subparagraph (b) shall apply to information
contained in or omitted from the Registration Statement or Prospectus, or any
amendment or supplement thereto, in reliance upon, and in conformity with,
written information relating to any Underwriter furnished to the Company by such
Underwriter specifically for use in the preparation thereof.

              (c)  Each of the Company and its subsidiaries has been duly
organized and is validly existing as a corporation in good standing under the
laws of the jurisdiction of its organized with full power and authority
(corporate and other) to own, lease and operate its properties and conduct its
business as described in the Prospectus; except as otherwise set forth in the
Registration Statement, the Company owns all of the outstanding capital stock of
its subsidiaries free and clear of any pledge, lien, security interest,
encumbrance, claim or equitable interest; each of the Company and its
subsidiaries is duly qualified to do business as a foreign corporation and is in
good standing in each jurisdiction in which the ownership or leasing of its
properties or the conduct of its business requires such qualification, except
where the failure to be so qualified or be in good standing would not have a
material adverse effect on the condition (financial or otherwise), earnings,
operations, business or business prospects of the Company and its subsidiaries
considered as one enterprise; no proceeding has been instituted in any such
jurisdiction, revoking, limiting or curtailing, or seeking to revoke, limit or
curtail, such power and authority or qualification; each of the Company and its
subsidiaries is in possession of and operating in compliance with all
authorizations, licenses, certificates, consents, orders and permits from state,
federal and other regulatory authorities which are material to the conduct of
its business, all of which are valid and in full force and effect; neither the
Company nor any of its subsidiaries is in violation of its respective charter or
bylaws or in default in the performance or observance of any material
obligation, agreement, covenant or condition contained in any material bond,
debenture, note or other evidence of indebtedness, or in any material lease,
contract, indenture, mortgage, deed of trust, loan agreement, joint venture or
other agreement or instrument to which the Company or any of its subsidiaries is
a party or by which it or any of its subsidiaries or their respective properties
may be bound; and neither the Company nor any of its subsidiaries is in material
violation of any law, order, rule, regulation, writ, injunction, judgment or
decree of any court, government or governmental agency or body, domestic or
foreign, having jurisdiction over the Company or any of its subsidiaries or over
their respective properties of which it has knowledge. The Company does not own
or control, directly or indirectly, any corporation, association or other entity
other than Knight Securities, Inc., Trimark Securities, Inc., KTG Holding
Corporation and Knight Securities International Limited.

              (d)  The Company has full legal right, power and authority to
enter into this Agreement and perform the transactions contemplated hereby. This
Agreement has been duly authorized, executed and delivered by the Company and is
a valid and binding agreement on the part of the Company, enforceable in
accordance with its terms, except as rights to indemnification hereunder may be
limited by applicable law and except as the enforcement hereof may be limited by
applicable bankruptcy, insolvency, reorganization, moratorium or other similar
laws relating to or affecting creditors' rights generally or by general
equitable principles; the

                                       3
<PAGE>
 
performance of this Agreement and the consummation of the transactions herein
contemplated will not result in a material breach or violation of any of the
terms and provisions of, or constitute a default under, (i) any material bond,
debenture, note or other evidence of indebtedness, or under any material lease,
contract, indenture, mortgage, deed of trust, loan agreement, joint venture or
other agreement or instrument to which the Company or any of its subsidiaries is
a party or by which it or any of its subsidiaries or their respective properties
may be bound, (ii) the charter or bylaws of the Company or any of its
subsidiaries, or (iii) any law, order, rule, regulation, writ, injunction,
judgment or decree of any court, government or governmental agency or body,
domestic or foreign, having jurisdiction over the Company or any of its
subsidiaries or over their respective properties. No consent, approval,
authorization or order of or qualification with any court, government or
governmental agency or body, domestic or foreign, having jurisdiction over the
Company or any of its subsidiaries or over their respective properties is
required for the execution and delivery of this Agreement and the consummation
by the Company or any of its subsidiaries of the transactions herein
contemplated, except such as may be required under the Act, the Securities
Exchange Act of 1934, as amended (the "Exchange Act") or under state or other
securities or Blue Sky laws, all of which requirements have been satisfied in
all material respects.

              (e)  There is not any pending or, to the best of the Company's
knowledge, threatened action, suit, claim or proceeding against the Company, any
of its subsidiaries or any of their respective officers or any of their
respective properties, assets or rights before any court, government or
governmental agency or body, domestic or foreign, having jurisdiction over the
Company or any of its subsidiaries or over their respective officers or
properties or otherwise which (i) might result in any material adverse change in
the condition (financial or otherwise), earnings, operations, business or
business prospects of the Company and its subsidiaries considered as one
enterprise or might materially and adversely affect their properties, assets or
rights, (ii) might prevent consummation of the transactions contemplated hereby
or (iii) is required to be disclosed in the Registration Statement or Prospectus
and is not so disclosed; and there are no agreements, contracts, leases or
documents of the Company or any of its subsidiaries of a character required to
be described or referred to in the Registration Statement or Prospectus or to be
filed as an exhibit to the Registration Statement by the Act or the Rules and
Regulations which have not been accurately described in all material respects in
the Registration Statement or Prospectus or filed as exhibits to the
Registration Statement.

              (f)  Upon closing of the Offering, all outstanding shares of
capital stock of the Company (including the Selling Stockholder Shares) will
have been duly authorized and validly issued and will be fully paid and
nonassessable, will have been issued in compliance with all federal and state
securities laws, will not have been issued in violation of or subject to any
preemptive rights or other rights to subscribe for or purchase securities, and
the authorized and outstanding capital stock of the Company is as set forth in
the Prospectus under the caption "Capitalization" and conforms in all material
respects to the statements relating thereto contained in the Registration
Statement and the Prospectus (and such statements correctly state the substance
of the instruments defining the capitalization of the Company); the Company
Shares and the Option Shares to be purchased from the Company hereunder have
been duly authorized for issuance and sale to the Underwriters pursuant to this
Agreement and, when issued and delivered by the Company against payment therefor
in accordance with the terms of this Agreement, will be duly and validly issued
and fully paid and nonassessable, and will be sold free and clear of any pledge,
lien, security interest, encumbrance, claim or equitable interest; and no
preemptive right, co-sale right, registration right, right of first refusal or
other similar right of stockholders exists with respect to any of the Firm
Company Shares or Option Shares to be purchased from the Company hereunder or
the issuance and sale thereof other than those that have been expressly waived
prior to the date hereof and those that will automatically expire upon and will
not apply to the consummation of the transactions contemplated on the Closing
Date. No further approval or authorization of any stockholder, the Board of
Directors of the Company or others is required for the issuance and sale or
transfer of the Shares except as may be required under the Act, the Exchange Act
or under state or other securities or Blue Sky laws. All issued and outstanding
shares of capital stock of each subsidiary of the Company have been duly
authorized and validly issued and are fully paid and nonassessable, and were not
issued in violation of or subject to any preemptive right, or other rights to
subscribe for or purchase shares and are owned by the Company free and clear of
any pledge, lien, security interest, encumbrance, claim or equitable interest.
Except as disclosed in the Prospectus and the financial statements of the
Company, and the related notes thereto, included in the Prospectus, neither the
Company nor any subsidiary has outstanding any options to purchase, or any
preemptive rights or other rights to subscribe for or to purchase, any
securities or obligations convertible into, or any contracts or commitments to
issue or sell, shares of its capital stock or any such options, rights,
convertible securities or obligations. The description of the Company's stock
option, stock bonus and other stock plans or arrangements, and

                                       4
<PAGE>
 
the options or other rights granted and exercised thereunder, set forth in the
Prospectus accurately and fairly presents the information required to be shown
with respect to such plans, arrangements, options and rights.

              (g)  PricewaterhouseCoopers LLP, which has examined the
consolidated financial statements of the Company, together with the related
schedules and notes, for the period from March 27, 1995 through December 1995
and for each of the years in the three (3) years ended December 31, 1998 filed
with the Commission as a part of the Registration Statement, which are included
in the Prospectus, are independent accountants within the meaning of the Act and
the Rules and Regulations; the audited consolidated financial statements of the
Company, together with the related schedules and notes, forming part of the
Registration Statement and Prospectus, fairly present the financial position and
the results of operations of the Company and its subsidiaries at the respective
dates and for the respective periods to which they apply; and all audited
consolidated financial statements of the Company, together with the related
schedules and notes filed with the Commission as part of the Registration
Statement, have been prepared in accordance with generally accepted accounting
principles consistently applied throughout the periods involved except as may be
otherwise stated therein. The selected and summary financial and statistical
data included in the Registration Statement present fairly the information shown
therein and have been compiled on a basis consistent with the audited financial
statements presented therein. No other financial statements or schedules are
required to be included in the Registration Statement.

              (h)  Subsequent to the respective dates as of which information is
given in the Registration Statement and Prospectus, there has not been (i) any
material adverse change in the condition (financial or otherwise), earnings,
operations, business or business prospects of the Company and its subsidiaries
considered as one enterprise, (ii) any transaction that is material to the
Company and its subsidiaries considered as one enterprise, except transactions
entered into in the ordinary course of business, (iii) any obligation, direct or
contingent, that is material to the Company and its subsidiaries considered as
one enterprise, incurred by the Company or its subsidiaries, except obligations
incurred in the ordinary course of business, (iv) any change in the capital
stock or outstanding indebtedness of the Company or any of its subsidiaries that
is material to the Company and its subsidiaries considered as one enterprise,
(v) any dividend or distribution of any kind declared, paid or made on the
capital stock of the Company or any of its subsidiaries, or (vi) any loss or
damage (whether or not insured) to the property of the Company or any of its
subsidiaries which has been sustained or will have been sustained which has a
material adverse effect on the condition (financial or otherwise), earnings,
operations, business or business prospects of the Company and its subsidiaries
considered as one enterprise.

              (i)  Except as set forth in the Registration Statement and
Prospectus, (i) each of the Company and its subsidiaries has good and marketable
title to all properties and assets described in the Registration Statement and
Prospectus as owned by it, free and clear of any pledge, lien, security
interest, encumbrance, claim or equitable interest, other than such as would not
have a material adverse effect on the condition (financial or otherwise),
earnings, operations, business or business prospects of the Company and its
subsidiaries considered as one enterprise, (ii) the agreements to which the
Company or any of its subsidiaries is a party described in the Registration
Statement and Prospectus are valid agreements, enforceable by the Company and
its subsidiaries (as applicable), except as the enforcement thereof may be
limited by applicable bankruptcy, insolvency, reorganization, moratorium or
other similar laws relating to or affecting creditors' rights generally or by
general equitable principles and, to the best of the Company's knowledge, the
other contracting party or parties thereto are not in material breach or
material default under any of such agreements, and (iii) each of the Company and
its subsidiaries has valid and enforceable leases for all properties described
in the Registration Statement and Prospectus as leased by it, except as the
enforcement thereof may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium or other similar laws relating to or affecting
creditors' rights generally or by general equitable principles. Except as set
forth in the Registration Statement and Prospectus, the Company owns or leases
all such properties as are necessary to its operations as now conducted or as
proposed to be conducted.

              (j)  The Company and its subsidiaries have timely filed all
necessary federal, state and foreign income and franchise tax returns and have
paid all taxes shown thereon as due, and there is no tax deficiency that has
been or, to the best of the Company's knowledge, might be asserted against the
Company or any of its subsidiaries that might have a material adverse effect on
the condition (financial or otherwise), earnings, operations, business or
business prospects of the Company and its subsidiaries considered as one
enterprise; and all tax liabilities are adequately provided for on the books of
the Company and its subsidiaries.

                                       5
<PAGE>
 
              (k)  The Company and its subsidiaries maintain insurance (subject
to customary deductibles and retentions) with insurers of recognized financial
responsibility of the types and in the amounts generally deemed adequate for
their respective businesses and consistent with insurance coverage maintained by
similar companies in similar businesses, including, but not limited to,
insurance covering real and personal property owned or leased by the Company
(which may include self-insurance in comparable form to that maintained by such
companies) or its subsidiaries against theft, damage, destruction, acts of
vandalism and all other risks customarily insured against, all of which
insurance is in full force and effect; and neither the Company nor any such
subsidiary has any reason to believe that it will not be able to renew its
existing insurance coverage as and when such coverage expires or to obtain
similar coverage from similar insurers as may be necessary to continue its
business at a cost that would not materially and adversely affect the condition
(financial or otherwise), earnings, operations, business or business prospects
of the Company and its subsidiaries considered as one enterprise.

              (l)  To the best of Company's knowledge, no labor disturbance by
the employees of the Company or any of its subsidiaries exists or is imminent
that might be expected to result in a material adverse change in the condition
(financial or otherwise), earnings, operations, business or business prospects
of the Company and its subsidiaries considered as one enterprise. No collective
bargaining agreement exists with any of the Company's employees and, to the best
of the Company's knowledge, no such agreement is imminent.

              (m)  Each of the Company and its subsidiaries owns or possesses
adequate rights to use all patents, patent rights, inventions, trade secrets,
know-how, trademarks, service marks, trade names and copyrights which are
necessary to conduct its businesses as described in the Registration Statement
and Prospectus; the expiration of any patents, patent rights, trade secrets,
trademarks, service marks, trade names or copyrights would not have a material
adverse effect on the condition (financial or otherwise), earnings, operations,
business or business prospects of the Company and its subsidiaries considered as
one enterprise; the Company has not received any notice of, and has no knowledge
of, any infringement of or conflict with asserted rights of the Company by
others with respect to any patent, patent rights, inventions, trade secrets,
know-how, trademarks, service marks, trade names or copyrights; and the Company
has not received any notice of, and has no knowledge of, any infringement of or
conflict with asserted rights of others with respect to any patent, patent
rights, inventions, trade secrets, know-how, trademarks, service marks, trade
names or copyrights which, singly or in the aggregate, if the subject of an
unfavorable decision, ruling or finding, might have a material adverse effect on
the condition (financial or otherwise), earnings, operations, business or
business prospects of the Company and its subsidiaries considered as one
enterprise.

              (n) The Common Stock is registered pursuant to Section 12(g) of
the Exchange Act and is listed on The Nasdaq National Market; the Shares have
been approved for listing on The Nasdaq National Market; and the Company has
taken no action designed to, or likely to have the effect of, terminating the
registration of the Common Stock under the Exchange Act or delisting the Common
Stock from The Nasdaq National Market, nor has the Company received any
notification that the Commission or the National Association of Securities
Dealers, Inc. ("NASD") is contemplating terminating such registration or
listing.

              (o)  The Company has been advised concerning the Investment
Company Act of 1940, as amended (the "1940 Act"), and the rules and regulations
thereunder, and has in the past conducted, and intends in the future to conduct,
its affairs in such a manner as to ensure that it will not become an "investment
company" or a company "controlled" by an "investment company" within the meaning
of the 1940 Act and such rules and regulations.

              (p)  The Company has not distributed and will not distribute prior
to the later of (i) the Closing Date, or any date on which Option Shares are to
be purchased, as the case may be, and (ii) completion of the distribution of the
Shares, any offering material in connection with the offering and sale of the
Shares other than any Preliminary Prospectuses, the Prospectus, the Registration
Statement and other materials, if any, permitted by the Act.

              (q)  Neither the Company nor any of its subsidiaries has at any
time during the last five (5) years (i) made any unlawful contribution to any
candidate for foreign office or failed to disclose fully any contribution in
violation of law, or (ii) made any payment to any federal or state governmental
officer or official, or

                                       6
<PAGE>
 
other person charged with similar public or quasi-public duties, other than
payments required or permitted by the laws of the United States or any
jurisdiction thereof.

              (r)  The Company has not taken and will not take, directly or
indirectly, any action designed to or that might reasonably be expected to cause
or result in stabilization or manipulation of the price of the Common Stock to
facilitate the sale or resale of the Shares.

              (s)  Each officer and director of the Company, and each Selling
Stockholder has agreed in writing that such person will not, for a period of 90
days from the date that the Registration Statement is declared effective by the
Commission (the "Lock-up Period"), offer to sell, contract to sell, or otherwise
sell, dispose of, loan, pledge or grant any rights with respect to
(collectively, a "Disposition") any shares of Common Stock, any options or
warrants to purchase any shares of Common Stock or any securities convertible
into or exchangeable for shares of Common Stock (collectively, "Securities") now
owned or hereafter acquired, directly or indirectly, by such person or with
respect to which such person has or hereafter acquires the power of disposition,
otherwise than (i) as a bona fide gift or gifts, provided the donee or donees
thereof agree in writing to be bound by this restriction, (ii) as a distribution
to partners or stockholders of such person, provided that the distributees
thereof agree in writing to be bound by the terms of this restriction or (iii)
with the prior written consent of BancBoston Robertson Stephens. The foregoing
restriction has been expressly agreed to preclude the holder of the Securities
from engaging in any hedging or other transaction which is designed to or
reasonably expected to lead to or result in a Disposition of Securities during
the Lock-up Period, even if such Securities would be disposed of by someone
other than such holder. Such prohibited hedging or other transactions would
include, without limitation, any short sale (whether or not against the box) or
any purchase, sale or grant of any right (including, without limitation, any put
or call option) with respect to any Securities or with respect to any security
(other than a broad-based market basket or index) that includes, relates to or
derives any significant part of its value from Securities. Furthermore, such
person has also agreed and consented to the entry of stop transfer instructions
with the Company's transfer agent against the transfer of the Securities held by
such person except in compliance with this restriction. The Company has provided
to counsel for the Underwriters a complete and accurate list of all
securityholders of the Company and the number and type of securities held by
each securityholder. The Company has provided to counsel for the Underwriters
true, accurate and complete copies of all of the agreements pursuant to which
its officers, directors and stockholders have agreed to such or similar
restrictions (the "Lock-up Agreements") presently in effect or effected hereby.
The Company hereby represents and warrants that it will not release any of its
officers, directors or other stockholders from any Lock-up Agreements currently
existing or hereafter effected without the prior written consent of BancBoston
Robertson Stephens.

              (t)  Except as set forth in the Registration Statement and
Prospectus, (i) the Company is in compliance with all rules, laws and
regulations relating to the use, treatment, storage and disposal of toxic
substances and protection of health or the environment ("Environmental Laws")
which are applicable to its business, (ii) the Company has received no notice
from any governmental authority or third party of an asserted claim under
Environmental Laws, which claim is required to be disclosed in the Registration
Statement and the Prospectus, (iii) the Company will not be required to make
future material capital expenditures to comply with Environmental Laws and (iv)
no property which is owned, leased or occupied by the Company has been
designated as a Superfund site pursuant to the Comprehensive Response,
Compensation, and Liability Act of 1980, as amended (42 U.S.C. (S) 9601, et
seq.), or otherwise designated as a contaminated site under applicable state or
local law.

              (u)  The Company and each of its subsidiaries maintain a system of
internal accounting controls sufficient to provide reasonable assurances that
(i) transactions are executed in accordance with management's general or
specific authorizations, (ii) transactions are recorded as necessary to permit
preparation of financial statements in conformity with generally accepted
accounting principles and to maintain accountability for assets, (iii) access to
assets is permitted only in accordance with management's general or specific
authorization, and (iv) the recorded accountability for assets is compared with
existing assets at reasonable intervals and appropriate action is taken with
respect to any differences.

              (v)  There are no outstanding loans, advances (except normal
advances for business expenses in the ordinary course of business) or guarantees
of indebtedness by the Company to or for the benefit of any of the officers or
directors of the Company or any of the members of the families of any of them,
except as disclosed in the Registration Statement and the Prospectus.

                                       7
<PAGE>
 
              (w)  The Company has reviewed its trading-related, communications
and data processing systems and that of its subsidiaries to evaluate the extent
to the business or operations of the Company or any of its subsidiaries will be
affected by the Year 2000 Problem. As a result of such review, the Company has
no reason to believe, and does not believe, that the Year 2000 Problem, insofar
as it relates to the trading-related, communications and data processing systems
of the Company and its subsidiaries, will have a material adverse effect on the
condition (financial or otherwise), earnings, operations, business or business
prospects of the Company and its subsidiaries or result in any material loss or
interference with the Company's business or operations. The "Year 2000 Problem"
as used herein means any significant risk that computer hardware or software
used in the receipt, transmission, processing, manipulation, storage, retrieval,
retransmission or other utilization of data or in the operation of mechanical or
electrical systems of any kind will not, in the case of dates or time periods
occurring after December 31, 1999, function at least as effectively as in the
case of dates or time periods occurring prior to January 1, 2000.

              (x)  The Company has timely and properly filed with the Commission
all reports and other documents required to have been filed by it with the
Commission pursuant to the Act, the Exchange Act and the Rules and Regulations.
True and complete copies of all such reports and other documents have been
delivered to you or your counsel.

          II.  Each of the Selling Stockholders, severally and not jointly,
represent and warrant to and agrees with each Underwriter and the Company that:

              (a)  Such Selling Stockholder now has and on the Closing Date,
will have valid marketable title to the Shares to be sold by such Selling
Stockholder, free and clear of any pledge, lien, security interest, encumbrance,
claim or equitable interest other than pursuant to this Agreement; and upon
delivery of such Shares hereunder and payment of the purchase price as herein
contemplated, each of the Underwriters will obtain valid marketable title to the
Shares purchased by it from such Selling Stockholder, free and clear of any
pledge, lien, security interest pertaining to such Selling Stockholder or such
Selling Stockholder's property, encumbrance, claim or equitable interest.

              (b)  Such Selling Stockholder has duly authorized (if applicable),
executed and delivered, in the form heretofore furnished to the Representatives,
an irrevocable Power of Attorney (the "Power of Attorney") appointing Michael T.
Dorsey and Robert I. Turner as attorneys-in-fact (collectively, the "Attorneys"
and individually, an "Attorney") and a Letter of Transmittal and Custody
Agreement (the "Custody Agreement") with ChaseMellon Shareholder Services, as
custodian (the "Custodian"); each of the Power of Attorney and the Custody
Agreement constitutes a valid and binding agreement on the part of such Selling
Stockholder, enforceable in accordance with its terms, except as the enforcement
thereof may be limited by applicable bankruptcy, insolvency, reorganization,
moratorium or other similar laws relating to or affecting creditors' rights
generally or by general equitable principles; and each of such Selling
Stockholder's Attorneys, acting alone, is authorized to execute and deliver this
Agreement and the certificate referred to in Section 6(h) hereof on behalf of
such Selling Stockholder, to determine the purchase price to be paid by the
several Underwriters to such Selling Stockholder as provided in Section 3
hereof, to authorize the delivery of the Selling Stockholder Shares under this
Agreement and to duly endorse (in blank or otherwise) the certificate or
certificates representing such Shares or a stock power or powers with respect
thereto, to accept payment therefor, and otherwise to act on behalf of such
Selling Stockholder in connection with this Agreement.

              (c)  All consents, approvals, authorizations and orders required
for the execution and delivery by such Selling Stockholder of the Power of
Attorney and the Custody Agreement, the execution and delivery by or on behalf
of such Selling Stockholder of this Agreement and the sale and delivery of the
Selling Stockholder Shares under this Agreement (other than, at the time of the
execution hereof (if the Registration Statement has not yet been declared
effective by the Commission), the issuance of the order of the Commission
declaring the Registration Statement effective and such consents, approvals,
authorizations or orders as may be necessary under state or other securities or
Blue Sky laws) have been obtained and are in full force and effect; such Selling
Stockholder, if other than a natural person, has been duly organized and is
validly existing in good standing under the laws of the jurisdiction of its
organization as the type of entity that it purports to be; and such Selling
Stockholder has full legal right, power and authority to enter into and perform
its obligations under this Agreement

                                       8
<PAGE>
 
and such Power of Attorney and Custody Agreement, and to sell, assign, transfer
and deliver the Shares to be sold by such Selling Stockholder under this
Agreement.

              (d)  Such Selling Stockholder will not, during the Lock-up Period,
effect the Disposition of any Securities now owned or hereafter acquired,
directly or indirectly by such Selling Stockholder or with respect to which such
Selling Stockholder has or hereafter acquires the power of disposition,
otherwise than (i) as a bona fide gift or gifts, provided the donee or donees
thereof agree in writing to be bound by this restriction, (ii) as a distribution
to partners or stockholders of such Selling Stockholder, provided that the
distributees thereof agree in writing to be bound by the terms of this
restriction or (iii) with the prior written consent of BancBoston Robertson
Stephens. The foregoing restriction is expressly agreed to preclude the holder
of the Securities from engaging in any hedging or other transaction which is
designed to or reasonably expected to lead to or result in a Disposition of
Securities during the Lock-up Period, even if such Securities would be disposed
of by someone other than the Selling Stockholder. Such prohibited hedging or
other transactions wold including, without limitation, any short sale (whether
or not against the box) or any purchase, sale or grant of any right (including,
without limitation, any put or call option) with respect to any Securities or
with respect to any security (other than a broad-based market basket or index)
that includes, relates or to derives any significant part of its value from
Securities. Such Selling Stockholder also agrees and consents to the entry of
stop transfer instructions with the Company's transfer agent against the
transfer of the securities held by such Selling Stockholder except in compliance
with this restriction.

              (e)  Certificates in negotiable form for all Shares to be sold by
such Selling Stockholder under this Agreement, together with a stock power or
powers duly endorsed in blank by such Selling Stockholder, have been placed in
custody with the Custodian for the purpose of effecting delivery hereunder.

              (f)  This Agreement has been duly authorized by the Selling
Stockholder and has been duly executed and delivered by or on behalf of such
Selling Stockholder and is a valid and binding agreement of such Selling
Stockholder, enforceable in accordance with its terms, except as rights to
indemnification hereunder may be limited by applicable law and except as the
enforcement hereof may be limited by bankruptcy, insolvency, reorganization,
moratorium or other similar laws relating to or affecting creditors' rights
generally or by general equitable principles; and the performance of this
Agreement and the consummation of the transactions herein contemplated will not
result in a breach or violation of any of the terms and provisions of or
constitute a default under any material bond, debenture, note or other evidence
of indebtedness, or under any material lease, contract, indenture, mortgage,
deed of trust, loan agreement, joint venture or other agreement or instrument to
which such Selling Stockholder is a party or by which such Selling Stockholder,
or any Selling Stockholder Shares hereunder, may be bound or, to the best of
such Selling Stockholder's knowledge, result in any violation of any law, order,
rule, regulation, writ, injunction, judgment or decree of any court, government
or governmental agency or body, domestic or foreign, having jurisdiction over
such Selling Stockholder or over the properties of such Selling Stockholder, or,
if such Selling Stockholder is other than a natural person, result in any
violation of any provisions of the charter, bylaws or other organizational
documents of such Selling Stockholder.

              (g)  Such Selling Stockholder has not taken and will not take,
directly or indirectly, any action designed to or that might reasonably be
expected to cause or result in stabilization or manipulation of the price of the
Common Stock to facilitate the sale or resale of the Shares.

              (h)  Such Selling Stockholder has not distributed and will not
distribute any prospectus or other offering material in connection with the
offering and sale of the Shares.

              (i)  All information furnished by or on behalf of such Selling
Stockholder relating to such Selling Stockholder and the Selling Stockholder
Shares that is contained in the representations and warranties of such Selling
Stockholder in such Selling Stockholder's Power of Attorney or set forth in the
Registration Statement or the Prospectus is, and at the time the Registration
Statement became or becomes, as the case may be, effective and at all times
subsequent thereto up to and on the Closing Date, was or will be, true, correct
and complete, and does not, and at the time the Registration Statement became or
becomes, as the case may be, effective and at all times subsequent thereto up to
and on the Closing Date (hereinafter defined) will not, contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make such information not misleading.

                                       9
<PAGE>
 
              (j)  Such Selling Stockholder will review the Prospectus and will
comply with all agreements and satisfy all conditions on its part to be complied
with or satisfied pursuant to this Agreement on or prior to the Closing Date and
will advise one of its Attorneys and BancBoston Robertson Stephens prior to the
Closing Date if any statement to be made on behalf of such Selling Stockholder
in the certificate contemplated by Section 6(h) would be inaccurate if made as
of the Closing Date.

              (k)  Such Selling Stockholder does not have, or has waived prior
to the date hereof, any preemptive right, co-sale right or right of first
refusal or other similar right to purchase any of the Shares that are to be sold
by the Company to the Underwriters pursuant to this Agreement; such Selling
Stockholder does not have, or has waived prior to the date hereof, any
registration right or other similar right to participate in the offering made by
the Prospectus, other than such rights of participation as have been satisfied
by the participation of such Selling Stockholder in the transactions to which
this Agreement relates in accordance with the terms of this Agreement; and such
Selling Stockholder does not own any warrants, options or similar rights to
acquire, and does not have any right or arrangement to acquire, any capital
stock, rights, warrants, options or other securities from the Company, other
than those described in the Registration Statement and the Prospectus.

          III.  Each of the Selling Stockholders listed on Schedule C (the
                                                           ----------
"Principal Selling Stockholders"), severally and not jointly, represent and
warrant to and agree with each Underwriter that each Preliminary Prospectus has
not included any untrue statement of a material fact or omitted to state a
material fact necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading; and at the time the
Registration Statement became or becomes, as the case may be, effective and at
all times subsequent thereto up to and on the Closing Date (hereinafter defined)
and on any later date on which Option Shares are to be purchased, (i) the
Registration Statement and the Prospectus, and any amendments or supplements
thereto, contained and will contain all material information required to be
included therein by the Act and the Rules and Regulations and will in all
material respects conform to the requirements of the Act and the Rules and
Regulations, (ii) the Registration Statement, and any amendments or supplements
thereto, did not and will not include any untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements therein not misleading, and (iii) the Prospectus, and any
amendments or supplements thereto, did not and will not include any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements therein, in the light of the circumstances under which they were
made, not misleading; provided, however, that none of the representations and
                      --------  -------      
warranties contained herein shall apply to information contained in or omitted
from the Registration Statement or Prospectus, or any amendment or supplement
thereto, in reliance upon, and in conformity with, written information relating
to any Underwriter furnished to the Company by such Underwriter specifically for
use in the preparation thereof.

          3.  Purchase, Sale and Delivery of Shares.  On the basis of the 
              -------------------------------------
representations, warranties and agreements herein contained, but subject to the
terms and conditions herein set forth, the Company and each of the Selling
Stockholders agree, to sell to the Underwriters, and each Underwriter agrees,
severally and not jointly, to purchase from the Company and the Selling
Stockholders, at a purchase price of $______ per share, the respective number of
Company Shares as hereinafter set forth and Selling Stockholder Shares set forth
opposite the names of the Company and the Selling Stockholders in Schedule B
                                                                  ----------
hereto. The obligation of each Underwriter to the Company and to the Selling
Stockholders shall be to purchase from the Company or such Selling Stockholders
that number of Company Shares or Selling Stockholder Shares, as the case may be,
which (as nearly as practicable, as determined by you) is in the same proportion
to the number of Company Shares or Selling Stockholder Shares, as the case may
be, set forth opposite the name of the Company or such Selling Stockholders in
Schedule B hereto as the number of Firm Shares which is set forth opposite the
- ----------
name of such Underwriter in Schedule A hereto (subject to adjustment as provided
                            ----------
in Section 10) is to the total number of Firm Shares to be purchased by all the
Underwriters under this Agreement.

          The certificates in negotiable form for the Selling Stockholder Shares
have been placed in custody (for delivery under this Agreement) under the
Custody Agreement.  Each Selling Stockholder agrees that the certificates for
the Selling Stockholder Shares of such Selling Stockholder so held in custody
are subject to the interests of the Underwriters hereunder, that the
arrangements made by such Selling Stockholder for such custody, including the
Power of Attorney is to that extent irrevocable and that the obligations of such
Selling Stockholder hereunder shall not be terminated by the act of such Selling
Stockholder or by operation of law, whether by the death or incapacity of such
Selling Stockholder or the occurrence of any other event, except as specifically
provided herein or in the Custody Agreement.  If the Selling Stockholder should
die or be incapacitated, or if any other such event should occur, before the
delivery of the certificates for the Selling Stockholder Shares hereunder, the
Selling Stockholder Shares to be sold by such Selling Stockholder shall, except
as specifically provided 

                                       10
<PAGE>
 
herein or in the Custody Agreement, be delivered by the Custodian in accordance
with the terms and conditions of this Agreement as if such death, incapacity or
other event had not occurred, regardless of whether the Custodian shall have
received notice of such death or other event.

          Delivery of definitive certificates for the Firm Shares to be
purchased by the Underwriters pursuant to this Section 3 shall be made against
payment of the purchase price therefor by the several Underwriters by wire
transfer in same-day funds, payable to the order of the Company with regard to
the Shares being purchased from the Company, and to the order of the Custodian
for the account of the Selling Stockholders with regard to the Shares being
purchased from such Selling Stockholders (and the Company and such Selling
Stockholders agree not to deposit and to cause the Custodian not to take any
action with the purpose or effect of receiving immediately available funds,
until the business day following the date of its delivery to the Company or the
Custodian, as the case may be, and, in the event of any breach of the foregoing,
the Company or the Selling Stockholders, as the case may be, shall reimburse the
Underwriters for the interest lost and any other expenses borne by them by
reason of such breach), at the offices of  Skadden, Arps, Slate, Meagher & Flom
LLP, 919 Third Avenue, New York, New York  10022-3897 (or at such other place as
may be agreed upon among the Representatives and the Company and the Attorneys),
at 10:00 A.M., New York time (a) on the third (3rd) full business day following
the first day that Shares are traded, (b) if this Agreement is executed and
delivered after 4:30 P.M., New York time, the fourth (4th) full business day
following the day that this Agreement is executed and delivered or (c) at such
other time and date not later than seven (7) full business days following the
first day that Shares are traded as the Representatives and the Company and the
Attorneys may determine (or at such time and date to which payment and delivery
shall have been postponed pursuant to Section 10 hereof), such time and date of
payment and delivery being herein called the "Closing Date;" provided, however,
                                                             --------  ------- 
that if the Company has not made available to the Representatives copies of the
Prospectus within the time provided in Section 4(d) hereof, the Representatives
may, in their sole discretion, postpone the Closing Date until no later than two
(2) full business days following delivery of copies of the Prospectus to the
Representatives.  The certificates for the Firm Shares to be so delivered will
be made available to you at such office or such other location including,
without limitation, in New York City, as you may reasonably request for checking
at least one (1) full business day prior to the Closing Date and will be in such
names and denominations as you may request, such request to be made at least two
(2) full business days prior to the Closing Date.  If the Representatives so
elect, delivery of the Firm Shares may be made by credit through full fast
transfer to the accounts at The Depository Trust Company designated by the
Representatives.

          It is understood that you, individually, and not as the
Representatives of the several Underwriters, may (but shall not be obligated to)
make payment of the purchase price on behalf of any Underwriter or Underwriters
whose check or checks shall not have been received by you prior to the Closing
Date for the Firm Shares to be purchased by such Underwriter or Underwriters.
Any such payment by you shall not relieve any such Underwriter or Underwriters
of any of its or their obligations hereunder.

          After the Registration Statement becomes effective, the several
Underwriters intend to make an initial public offering (as such term is
described in Section 11 hereof) of the Firm Shares at an initial public offering
price of $______ per share.  After the initial public offering, the several
Underwriters may, in their discretion, vary the public offering price.

          The information set forth under the first and second paragraphs under
the caption "Underwriting" in any Preliminary Prospectus and in the Prospectus
constitutes the only information furnished by the Underwriters to the Company
for inclusion in any Preliminary Prospectus, the Prospectus or the Registration
Statement, and you, on behalf of the respective Underwriters, represent and
warrant to the Company and the Selling Stockholders that the statements made
therein do not include any untrue statement of a material fact or omit to state
a material fact required to be stated therein or necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading.

                                       11
<PAGE>
 
          4.  Further Agreements of the Company.  The Company agrees with the 
              ---------------------------------
several Underwriters that:

              (a)  The Company will use its best efforts to cause the
Registration Statement and any amendment thereof, if not effective at the time
and date that this Agreement is executed and delivered by the parties hereto, to
become effective as promptly as possible; the Company will use its best efforts
to cause any abbreviated registration statement pursuant to Rule 462(b) of the
Rules and Regulations as may be required subsequent to the date the Registration
Statement is declared effective to become effective as promptly as possible; the
Company will notify you, promptly after it shall receive notice thereof, of the
time when the Registration Statement, any subsequent amendment to the
Registration Statement or any abbreviated registration statement has become
effective or any supplement to the Prospectus has been filed; if the Company
omitted information from the Registration Statement at the time it was
originally declared effective in reliance upon Rule 430A(a) of the Rules and
Regulations, the Company will provide evidence satisfactory to you that the
Prospectus contains such information and has been filed, within the time period
prescribed, with the Commission pursuant to subparagraph (1) or (4) of Rule
424(b) of the Rules and Regulations or as part of a post-effective amendment to
such Registration Statement as originally declared effective which is declared
effective by the Commission; if the Company files a term sheet pursuant to Rule
434 of the Rules and Regulations, the Company will provide evidence satisfactory
to you that the Prospectus and term sheet meeting the requirements of Rule
434(b) or (c), as applicable, of the Rules and Regulations, have been filed,
within the time period prescribed, with the Commission pursuant to subparagraph
(7) of Rule 424(b) of the Rules and Regulations; if for any reason the filing of
the final form of Prospectus is required under Rule 424(b)(3) of the Rules and
Regulations, it will provide evidence satisfactory to you that the Prospectus
contains such information and has been filed with the Commission within the time
period prescribed; it will notify you promptly of any request by the Commission
for the amending or supplementing of the Registration Statement or the
Prospectus or for additional information; promptly upon your request, it will
prepare and file with the Commission any amendments or supplements to the
Registration Statement or Prospectus which, in the opinion of counsel for the
several Underwriters ("Underwriters' Counsel"), may be necessary or advisable in
connection with the distribution of the Shares by the Underwriters; it will
promptly prepare and file with the Commission, and promptly notify you of the
filing of, any amendments or supplements to the Registration Statement or
Prospectus which may be necessary to correct any statements or omissions, if, at
any time when a prospectus relating to the Shares is required to be delivered
under the Act, any event shall have occurred as a result of which the Prospectus
or any other prospectus relating to the Shares as then in effect would include
any untrue statement of a material fact or omit to state a material fact
necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading; in case any Underwriter is required
to deliver a prospectus nine (9) months or more after the effective date of the
Registration Statement in connection with the sale of the Shares, it will
prepare promptly upon request, but at the expense of such Underwriter, such
amendment or amendments to the Registration Statement and such prospectus or
prospectuses as may be necessary to permit compliance with the requirements of
Section 10(a)(3) of the Act; and it will file no amendment or supplement to the
Registration Statement or Prospectus which shall not previously have been
submitted to you a reasonable time prior to the proposed filing thereof or to
which you shall reasonably object in writing, subject, however, to compliance
with the Act and the Rules and Regulations and the provisions of this Agreement.

              (b)  The Company will advise you, promptly after it shall receive
notice or obtain knowledge, of the issuance of any stop order by the Commission
suspending the effectiveness of the Registration Statement or of the initiation
or threat of any proceeding for that purpose; and it will promptly use its best
efforts to prevent the issuance of any stop order or to obtain its withdrawal at
the earliest possible moment if such stop order should be issued.

              (c)  The Company will use its best efforts to qualify the Shares
for offering and sale under the securities laws of such jurisdictions as you may
designate and to continue such qualifications in effect for so long as may be
required for purposes of the distribution of the Shares, except that the Company
shall not be required in connection therewith or as a condition thereof to
qualify as a foreign corporation or to execute a general consent to service of
process in any jurisdiction in which it is not otherwise required to be so
qualified or to so execute a general consent to service of process. In each
jurisdiction in which the Shares shall have been qualified as above provided,
the Company will make and file such statements and reports in each year as are
or may be required by the laws of such jurisdiction.

                                       12
<PAGE>
 
              (d)  The Company will furnish to you, as soon as available, and,
in the case of the Prospectus and any term sheet or abbreviated term sheet under
Rule 434, in no event later than the first (1st) full business day following the
first day that Shares are traded, copies of the Registration Statement (three of
which will be signed and which will include all exhibits), each Preliminary
Prospectus, the Prospectus and any amendments or supplements to such documents,
including any prospectus prepared to permit compliance with Section 10(a)(3) of
the Act, all in such quantities as you may from time to time reasonably request.
Notwithstanding the foregoing, if BancBoston Robertson Stephens, on behalf of
the several Underwriters, shall agree to the utilization of Rule 434 of the
Rules and Regulations, the Company shall provide to you copies of a Preliminary
Prospectus updated in all respects through the date specified by you in such
quantities as you may from time to time reasonably request.

              (e)  The Company will make generally available to its
securityholders as soon as practicable, but in any event not later than the
forty-fifth (45th) day following the end of the fiscal quarter first occurring
after the first anniversary of the effective date of the Registration Statement,
an earnings statement (which will be in reasonable detail but need not be
audited) complying with the provisions of Section 11(a) of the Act and covering
a twelve (12) month period beginning after the effective date of the
Registration Statement.

              (f)  During a period of three (3) years after the date hereof, the
Company will furnish to its stockholders as soon as practicable after the end of
each respective period, annual reports (including financial statements audited
by independent certified public accountants) and unaudited quarterly reports of
operations for each of the first three quarters of the fiscal year, and will
furnish to you, upon request (i) concurrently with furnishing such reports to
its stockholders, statements of operations of the Company for each of the first
three (3) quarters in the form furnished to the Company's stockholders, (ii)
concurrently with furnishing to its stockholders, a balance sheet of the Company
as of the end of such fiscal year, together with statements of operations, of
stockholders' equity, and of cash flows of the Company for such fiscal year,
accompanied by a copy of the certificate or report thereon of independent
certified public accountants, (iii) as soon as they are available, copies of all
reports (financial or other) mailed to stockholders, (iv) as soon as they are
available, copies of all reports and financial statements furnished to or filed
with the Commission, any securities exchange or the NASD, (v) every material
press release and every material news item or article in respect of the Company
or its affairs which was generally released to stockholders or prepared by the
Company or any of its subsidiaries, and (vi) any additional information of a
public nature concerning the business and financial condition of the Company or
its subsidiaries, which you may reasonably request. During such three (3) year
period, if the Company shall have active subsidiaries, the foregoing financial
statements shall be on a consolidated basis to the extent that the accounts of
the Company and its subsidiaries are consolidated, and shall be accompanied by
similar financial statements for any significant subsidiary which is not so
consolidated.

              (g)  The Company will apply the net proceeds from the sale of the
Shares being sold by it in the manner set forth under the caption "Use of
Proceeds" in the Prospectus.

              (h)  The Company will maintain a transfer agent and, if necessary
under the jurisdiction of incorporation of the Company, a registrar (which may
be the same entity as the transfer agent) for its Common Stock.

              (i)  If the transactions contemplated hereby are not consummated
by reason of any failure, refusal or inability on the part of the Company to
perform any agreement on its part to be performed hereunder or to fulfill any
condition of the Underwriters' obligations hereunder, or if the Company shall
terminate this Agreement pursuant to Section 11(a) hereof, or if the
Underwriters shall terminate this Agreement pursuant to Section 11(b)(i), the
Company will reimburse the several Underwriters for all out-of-pocket expenses
(including fees and disbursements of Underwriters' Counsel) incurred by the
Underwriters in investigating or preparing to market or marketing the Shares. If
the transactions contemplated hereby are not consummated by reason of any
failure, refusal or inability on the part of the Selling Stockholders to perform
any agreement on its part to be performed hereunder or to fulfill any condition
of the Underwriters' obligations hereunder, the Selling Stockholders will
reimburse the several Underwriters for all out-of-pocket expenses (including
fees and disbursements of Underwriters' Counsel) incurred by the Underwriters in
investigating or preparing to market or marketing the Shares.

              (j)  If at any time during the ninety (90) day period after the
Registration Statement becomes effective, any rumor, publication or event
relating to or affecting the Company shall occur as a result of 

                                       13
<PAGE>
 
which in your opinion the market price of the Common Stock has been or is likely
to be materially affected (regardless of whether such rumor, publication or
event necessitates a supplement to or amendment of the Prospectus), and, after
written notice from you advising the Company to the effect set forth above, the
Company shall consult with you concerning the possibility of issuing a press
release or other public statement and if the Company, in its sole discretion,
decides to issue a press release or other public statement, the Company will in
good faith consult with you concerning the substance of such press release or
other public statement.

              (k)  During the Lock-up Period, the Company will not, without the
prior written consent of BancBoston Robertson Stephens, effect the Disposition
of, directly or indirectly, any Securities other than the sale of the Company
Shares and the Option Shares to be sold by the Company hereunder and the
Company's issuance of options or Common Stock under the Company's presently
authorized 1998 Long-Term Incentive Plan or 1998 Non-employee Director Stock
Option Plan (the "Option Plans").

              (l)  During a period of ninety (90) days from the effective date
of the Registration Statement, the Company will not file a registration
statement registering shares under the Option Plans or other employee benefit
plan.

          5.  Expenses.
              -------- 

              (a)  The Company and each of the Selling Stockholders agree with
each Underwriter that:

                   (i)  The Company will pay and bear all costs and expenses in
connection with the preparation, printing and filing of the Registration
Statement (including financial statements, schedules and exhibits), Preliminary
Prospectuses and the Prospectus and any amendments or supplements thereto; the
printing of this Agreement, the Agreement Among Underwriters, the Selected
Dealer Agreement, the Preliminary Blue Sky Survey and any Supplemental Blue Sky
Survey, the Underwriters' Questionnaire and Power of Attorney, and any
instruments related to any of the foregoing; the issuance and delivery of the
Shares hereunder to the several Underwriters, including transfer taxes, if any,
the cost of all certificates representing the Shares and transfer agents' and
registrars' fees; the fees and disbursements of counsel for the Company; all
fees and other charges of the Company's independent certified public
accountants; the cost of furnishing to the several Underwriters copies of the
Registration Statement (including appropriate exhibits), Preliminary Prospectus
and the Prospectus, and any amendments or supplements to any of the foregoing;
NASD filing fees and the cost of qualifying the Shares under the laws of such
jurisdictions as you may designate (including filing fees and fees and
disbursements of Underwriters' Counsel in connection with such NASD filings and
Blue Sky qualifications); and all other expenses directly incurred by the
Company in connection with the performance of their obligations hereunder. Any
additional expenses incurred as a direct result of the sale of the Shares by the
Selling Stockholders will be borne by the Selling Stockholders. The provisions
of this Section 5(a)(i) are intended to relieve the Underwriters from the
payment of the expenses and costs which the Selling Stockholders and the Company
hereby agree to pay, but shall not affect any agreement which the Selling
Stockholders and the Company may make, or may have made, for the sharing of any
of such expenses and costs. Such agreements shall not impair the obligations of
the Company and the Selling Stockholders hereunder to the several Underwriters.

                   (ii) In addition to its other obligations under Section 8(a)
hereof, the Company agrees that, as an interim measure during the pendency of
any claim, action, investigation, inquiry or other proceeding described in
Section 8(a) hereof, it will reimburse the Underwriters on a monthly basis for
all reasonable legal or other expenses incurred in connection with investigating
or defending any such claim, action, investigation, inquiry or other proceeding,
notwithstanding the absence of a judicial determination as to the propriety and
enforceability of the Company's obligation to reimburse the Underwriters for
such expenses and the possibility that such payments might later be held to have
been improper by a court of competent jurisdiction. To the extent that any such
interim reimbursement payment is so held to have been improper, the Underwriters
shall promptly return such payment to the Company together with interest,
compounded daily, determined on the basis of the prime rate (or other commercial
lending rate for borrowers of the highest credit standing) listed from time to
time in The Wall Street Journal which represents the base rate on corporate
loans posted by a substantial majority of the nation's thirty (30) largest banks
(the "Prime Rate"). Any such interim reimbursement payments which are not made
to the 

                                       14
<PAGE>
 
Underwriters within thirty (30) days of a request for reimbursement shall bear
interest at the Prime Rate from the date of such request.

                   (iii)  In addition to its other obligations under Section
8(b) hereof, each of the Selling Stockholders agrees that, as an interim measure
during the pendency of any claim, action, investigation, inquiry or other
proceeding described in Section 8(b) hereof relating to such Selling
Stockholder, it will reimburse the Underwriters on a monthly basis for all
reasonable legal or other expenses incurred in connection with investigating or
defending any such claim, action, investigation, inquiry or other proceeding,
notwithstanding the absence of a judicial determination as to the propriety and
enforceability of such Selling Stockholder's obligation to reimburse the
Underwriters for such expenses and the possibility that such payments might
later be held to have been improper by a court of competent jurisdiction. To the
extent that any such interim reimbursement payment is so held to have been
improper, the Underwriters shall promptly return such payment to the Selling
Stockholder, together with interest, compounded daily, determined on the basis
of the Prime Rate. Any such interim reimbursement payments which are not made to
the Underwriters within thirty (30) days of a request for reimbursement shall
bear interest at the Prime Rate from the date of such request.

                   (iv) In addition to their other obligations under Section
8(c) hereof, the Underwriters, severally and not jointly, agree that, as an
interim measure during the pendency of any claim, action, investigation, inquiry
or other proceeding described in Section 8(c) hereof, they will reimburse the
Company and the Selling Stockholders on a monthly basis for all reasonable legal
or other expenses incurred in connection with investigating or defending any
such claim, action, investigation, inquiry or other proceeding, notwithstanding
the absence of a judicial determination as to the propriety and enforceability
of the Underwriters' obligation to reimburse the Company and such Selling
Stockholders for such expenses and the possibility that such payments might
later be held to have been improper by a court of competent jurisdiction. To the
extent that any such interim reimbursement payment is so held to have been
improper, the Company and such Selling Stockholders shall promptly return such
payment to the Underwriters together with interest, compounded daily, determined
on the basis of the Prime Rate. Any such interim reimbursement payments which
are not made to the Company and such Selling Stockholders within thirty (30)
days of a request for reimbursement shall bear interest at the Prime Rate from
the date of such request.

              (b)  It is agreed that any controversy arising out of the
operation of the interim reimbursement arrangements set forth in Sections
5(a)(ii), 5(a)(iii) and 5(a)(iv) hereof, including the amounts of any requested
reimbursement payments, the method of determining such amounts and the basis on
which such amounts shall be apportioned among the reimbursing parties, shall be
settled by arbitration conducted under the provisions of the Constitution and
Rules of the Board of Governors of the New York Stock Exchange, Inc. or pursuant
to the Code of Arbitration Procedure of the NASD. Any such arbitration must be
commenced by service of a written demand for arbitration or a written notice of
intention to arbitrate, therein electing the arbitration tribunal. In the event
the party demanding arbitration does not make such designation of an arbitration
tribunal in such demand or notice, then the party responding to said demand or
notice is authorized to do so. Any such arbitration will be limited to the
operation of the interim reimbursement provisions contained in Sections
5(a)(ii), 5(a)(iii) and 5(a)(iv) hereof and will not resolve the ultimate
propriety or enforceability of the obligation to indemnify for expenses which is
created by the provisions of Sections 8(a), 8(b) and 8(c) hereof or the
obligation to contribute to expenses which is created by the provisions of
Section 8(e) hereof.

          6.  Conditions of Underwriters' Obligations.  The obligations of the 
              ---------------------------------------
several Underwriters to purchase and pay for the Shares as provided herein shall
be subject to the accuracy, as of the date hereof and the Closing Date and any
later date on which Option Shares are to be purchased, as the case may be, of
the representations and warranties of the Company and the Selling Stockholders
herein, to the performance by the Company and the Selling Stockholders of their
respective obligations hereunder and to the following additional conditions:

              (a)  The Registration Statement shall have become effective not
later than 5:00 P.M., New York time, on the date following the date of this
Agreement, or such later date as shall be consented to in writing by you; and no
stop order suspending the effectiveness thereof shall have been issued and no
proceedings for that purpose shall have been initiated or, to the knowledge of
the Company, the Selling Stockholders or any Underwriter, threatened by the
Commission, and any request of the Commission for additional information (to be

                                       15
<PAGE>
 
included in the Registration Statement or the Prospectus or otherwise) shall
have been complied with to the satisfaction of Underwriters' Counsel.

              (b)  All corporate proceedings and other legal matters in
connection with this Agreement, the form of Registration Statement and the
Prospectus, and the registration, authorization, issue, sale and delivery of the
Shares, shall have been reasonably satisfactory to Underwriters' Counsel, and
such counsel shall have been furnished with such papers and information as they
may reasonably have requested to enable them to pass upon the matters referred
to in this Section.

              (c)  Subsequent to the execution and delivery of this Agreement
and prior to the Closing Date, or any later date on which Option Shares are to
be purchased, as the case may be, there shall not have been any change in the
condition (financial or otherwise), earnings, operations, business or business
prospects of the Company and its subsidiaries considered as one enterprise from
that set forth in the Registration Statement or Prospectus, which, in your sole
judgment, is material and adverse and that makes it, in your sole judgment,
impracticable or inadvisable to proceed with the public offering of the Shares
as contemplated by the Prospectus; and

              (d)  You shall have received on the Closing Date and on any later
date on which Option Shares are to be purchased, as the case may be, the
following opinion of counsel for the Company, dated the Closing Date or such
later date on which Option Shares are to be purchased addressed to the
Underwriters and with reproduced copies or signed counterparts thereof for each
of the Underwriters, to the effect that:

                   (i)  The Company and each Significant Subsidiary (as that
     term is defined in Regulation S-X of the Act) has been duly organized and
     is validly existing and in good standing under the laws of the jurisdiction
     of its organization;

                   (ii) The Company and each Significant Subsidiary has the
     corporate power and authority to own, lease and operate its properties and
     to conduct its business as described in the Prospectus;

                   (iii)  The Company and each Significant Subsidiary is duly
     qualified to do business as a foreign corporation and is in good standing
     in each jurisdiction, if any, in which the ownership or leasing of its
     properties or the conduct of its business requires such qualification,
     except where the failure to be so qualified or be in good standing would
     not have a material adverse effect on the condition (financial or
     otherwise), earnings, operations, business or business prospects of the
     Company and its subsidiaries considered as one enterprise. To such
     counsel's knowledge, the Company does not own or control, directly or
     indirectly, any corporation, association or other entity other than Knight
     Securities, Inc., Trimark Securities, Inc., KTG Holding Corporation and
     Knight Securities International Limited.

                   (iv) The authorized, issued and outstanding capital stock of
     the Company is as set forth in the Prospectus under the caption
     "Capitalization" as of the dates stated therein, the issued and outstanding
     shares of capital stock of the Company (including the Selling Stockholder
     Shares) have been duly authorized and validly issued and are fully paid and
     nonassessable, and, free and clear of any statutory preemptive rights or,
     to such counsel's knowledge, any similar rights;

                   (v)  All issued and outstanding shares of capital stock of
     each Significant Subsidiary of the Company have been duly authorized and
     validly issued and are fully paid and nonassessable, and, free and clear of
     any statutory preemptive rights or, to such counsel's knowledge, any
     similar rights;

                   (vi) The Firm Shares or the Option Shares, as the case may
     be, to be issued by the Company pursuant to the terms of this Agreement
     have been duly authorized and, upon issuance and delivery against payment
     therefor in accordance with the terms hereof, will be duly and validly
     issued and fully paid and nonassessable, and free and clear of any
     statutory preemptive rights or, to such counsel's knowledge, any similar
     rights;

                                       16
<PAGE>
 
                   (vii)  The Company has the corporate power and corporate
     authority to execute and deliver this Agreement and to perform its
     obligations hereunder;

                   (viii)  This Agreement has been duly authorized by all
     necessary corporate action on the part of the Company and has been duly
     executed and delivered by the Company and, assuming due authorization,
     execution and delivery by you, is a valid and binding agreement of the
     Company, enforceable in accordance with its terms, except insofar as
     indemnification provisions may be limited by applicable law and except as
     enforceability may be limited by bankruptcy, insolvency, reorganization,
     moratorium or similar laws relating to or affecting creditors' rights
     generally or by general equitable principles;

                   (ix) The Registration Statement has become effective under
     the Act and, to such counsel's knowledge, no stop order suspending the
     effectiveness of the Registration Statement has been issued and no
     proceedings for that purpose have been instituted or are pending or
     threatened under the Act;

                   (x)  The Registration Statement and the Prospectus, and each
     amendment or supplement thereto as of the effective date of the
     Registration Statement, complied as to form in all material respects with
     the requirements of the Act and the applicable Rules and Regulations,
     except that in each case such counsel need express no opinion as to the
     financial statements, schedules and other financial data included therein
     or excluded therefrom;

                   (xi) The information in the Prospectus under the captions
     "Risk Factors We are Subject to Extensive Government Regulation," "Risk
     Factors We Are Subject to Net Capital Requirements," "Risk Factors Certain
     Provisions of Delaware Law and Our Charter May Make a Takeover of Our
     Company More difficult," "Risk Factors Future Sales by Existing
     Stockholders Could Depress the Market Price of Our Common Stock," 
     "Business-Government Regulation," "Business - Net Capital Requirements,"
     "Business -Legal Proceedings," "Management Stock Option Plans," "Certain
     Transactions," "Description of Capital Stock," "Shares Eligible for Future
     Sale" and in items 14 and 15 of the Registration Statement, to the extent
     that any of the foregoing purport to summarize certain provisions of the
     documents statutes and regulations referred to therein, has been reviewed
     by such counsel and fairly presents the information disclosed therein in
     all material respects; and the forms of certificates evidencing the Common
     Stock and filed as exhibits to the Registration Statement are in proper
     form under the Delaware General Corporation Law;

                   (xii)  The description in the Registration Statement and the
     Prospectus of the charter and bylaws of the Company are accurate and fairly
     present the information required to be presented by the Act and the
     applicable Rules and Regulations;

                   (xiii)  The execution and delivery by the Company of this
     agreement and the performance by the Company of its obligations hereunder,
     in accordance with the terms hereof, do not (i) conflict with the Amended
     and Restated Certificate of Incorporation or Amended and Restated Bylaws of
     the Company, (ii) constitute a violation of or a default under any
     Applicable Contracts (as hereinafter defined) or (iii) cause the creation
     of any security interest or lien upon any of the property of the Company
     pursuant to any Applicable Contract. "Applicable Contracts" shall mean
     those agreements or instruments filed by the Company as exhibits to the
     Registration Statement;

                   (xiv)  No consent, approval, authorization or order of or
     qualification with any court, government or governmental agency or body
     having jurisdiction over the Company or any of its subsidiaries, or over
     any of their properties or operations is necessary in connection with the
     consummation by the Company of the transactions herein contemplated, except
     such as have been obtained under the Act or such as may be required under
     state or other securities or Blue Sky laws in connection with the purchase
     and the distribution of the Shares by the Underwriters;

                   (xv) To such counsel's knowledge, except as set forth in the
     Registration Statement and Prospectus, no holders of Common Stock or other
     securities of the Company have

                                       17
<PAGE>
 
     registration rights with respect to securities of the Company and, except
     as set forth in the Registration Statement and Prospectus, all holders of
     securities of the Company having rights known to such counsel to
     registration of such shares of Common Stock or other securities, because of
     the filing of the Registration Statement by the Company have, with respect
     to the offering contemplated thereby, waived such rights or such rights
     have expired by reason of lapse of time following notification of the
     Company's intent to file the Registration Statement or have included
     securities in the Registration Statement pursuant to the exercise of and in
     full satisfaction of such rights;

               In addition, such counsel shall state that such counsel has
     participated in conferences with officials and other representatives of the
     Company, the Representatives, Underwriters' Counsel and the independent
     certified public accountants of the Company, at which such conferences the
     contents of the Registration Statement and Prospectus and related matters
     were discussed, and although they are not passing on and do not accept
     responsibility for the accuracy, completeness or fairness of the statements
     contained in the Registration Statement or the Prospectus, and have made no
     independent check or verification thereof, on the basis of the foregoing,
     nothing has come to the attention of such counsel which leads them to
     believe that, at the time the Registration Statement became effective and
     at all times subsequent thereto up to and on the Closing Date and on any
     later date on which Option Shares are to be purchased, the Registration
     Statement and any amendment or supplement thereto (other than the financial
     statements including supporting schedules and other financial and
     statistical information derived therefrom, as to which such counsel need
     express no comment) contained any untrue statement of a material fact or
     omitted to state a material fact required to be stated therein or necessary
     to make the statements therein, in light of the circumstances in which they
     were made, not misleading, or at the Closing Date or any later date on
     which the Option Shares are to be purchased, as the case may be, the
     Registration Statement, the Prospectus and any amendment or supplement
     thereto (except as aforesaid) contained any untrue statement of a material
     fact or omitted to state a material fact necessary to make the statements
     therein, in the light of the circumstances under which they were made, not
     misleading.

               Counsel rendering the foregoing opinion may rely as to questions
     of law not involving the laws of the United States or the States of New
     York and Delaware upon opinions of local counsel, and as to questions of
     fact upon representations or certificates of officers of the Company, and
     of government officials, in which case their opinion is to state that they
     are so relying and that they have no knowledge of any material misstatement
     or inaccuracy in any such opinion, representation or certificate.  Copies
     of any opinion, representation or certificate so relied upon shall be
     delivered to you, as Representatives of the Underwriters, and to
     Underwriters' Counsel.

              (e)  You shall have received on the Closing Date the following
opinion of counsel for each of the Selling Stockholders dated the Closing Date
addressed to the Underwriters and with reproduced copies or signed counterparts
thereof for each of the Underwriters to the effect that:

                   (i)  Such Selling Stockholder has full right, power and
     authority to enter into and to perform its obligations under the Power of
     Attorney and Custody Agreement to be executed and delivered by it in
     connection with the transactions contemplated herein; the Power of Attorney
     and Custody Agreement of such Selling Stockholder has been duly authorized;
     the Power of Attorney and Custody Agreement of such Selling Stockholder has
     been duly executed and delivered by or on behalf of such Selling
     Stockholder; and the Power of Attorney and Custody Agreement of such
     Selling Stockholder constitutes the valid and binding agreement of such
     Selling Stockholder, enforceable in accordance with its terms, except as
     the enforcement thereof may be limited by bankruptcy, insolvency,
     reorganization, moratorium or other similar laws relating to or affecting
     creditors' rights generally or by general equitable principles;

                   (ii) The Selling Stockholder has full right, power and
     authority to enter into and to perform its obligations under this Agreement
     and to sell, transfer, assign and deliver the Shares to be sold by such
     Selling Stockholder hereunder;

                   (iii)  This Agreement has been duly authorized by the Selling
     Stockholder and has been duly executed and delivered by or on behalf of the
     Selling Stockholder; and

                                       18
<PAGE>
 
                   (iv) Upon the delivery of and payment for the Shares as
     contemplated in this Agreement, each of the Underwriters will receive valid
     marketable title to the Shares purchased by it from such Selling
     Stockholder, free and clear of any pledge, lien, security interest,
     encumbrance, claim or equitable interest. In rendering such opinion, such
     counsel may assume that the Underwriters are without notice of any defect
     in the title of the Shares being purchased from the Selling Stockholder.

               Counsel rendering the foregoing opinion may rely as to questions
     of law not involving the laws of the United States or the States of New
     York and Delaware upon opinions of local counsel, and as to questions of
     fact upon representations or certificates of the Selling Stockholder or
     officers of the Selling Stockholder (when the Selling Stockholder is not a
     natural person), and of government officials, in which case their opinion
     is to state that they are so relying and that they have no knowledge of any
     material misstatement or inaccuracy in any such opinion, representation or
     certificate.  Copies of any opinion, representation or certificate so
     relied upon shall be delivered to you, as Representatives of the
     Underwriters, and to Underwriters' Counsel.

              (f)  You shall have received on the Closing Date and on any later
date on which Option Shares are to be purchased, as the case may be, an opinion
of Brobeck, Phleger & Harrison LLP, in form and substance satisfactory to you,
with respect to the sufficiency of all such corporate proceedings and other
legal matters relating to this Agreement and the transactions contemplated
hereby as you may reasonably require, and the Company shall have furnished to
such counsel such documents as they may have requested for the purpose of
enabling them to pass upon such matters.

              (g)  You shall have received on the Closing Date and on any later
date on which Option Shares are to be purchased, as the case may be, a letter
from PricewaterhouseCoopers LLP addressed to the Underwriters, dated the Closing
Date or such later date on which Option Shares are to be purchased, as the case
may be, confirming that they are independent certified public accountants with
respect to the Company within the meaning of the Act and the applicable
published Rules and Regulations and based upon the procedures described in such
letter delivered to you concurrently with the execution of this Agreement
(herein called the "Original Letter"), but carried out to a date not more than
five (5) business days prior to the Closing Date or such later date on which
Option Shares are to be purchased, as the case may be, (i) confirming, to the
extent true, that the statements and conclusions set forth in the Original
Letter are accurate as of the Closing Date or such later date on which Option
Shares are to be purchased, as the case may be, and (ii) setting forth any
revisions and additions to the statements and conclusions set forth in the
Original Letter which are necessary to reflect any changes in the facts
described in the Original Letter since the date of such letter, or to reflect
the availability of more recent financial statements, data or information. The
letter shall not disclose any change in the condition (financial or otherwise),
earnings, operations, business or business prospects of the Company and its
subsidiaries considered as one enterprise from that set forth in the
Registration Statement or Prospectus, which, in your sole judgment, is material
and adverse and that makes it, in your sole judgment, impracticable or
inadvisable to proceed with the public offering of the Shares as contemplated by
the Prospectus. The Original Letter from PricewaterhouseCoopers LLP shall be
addressed to or for the use of the Underwriters in form and substance
satisfactory to the Underwriters and shall (i) represent, to the extent true,
that they are independent certified public accountants with respect to the
Company within the meaning of the Act and the applicable published Rules and
Regulations, (ii) set forth their opinion with respect to their examination of
the consolidated balance sheet of the Company as of December 31, 1998 and
related consolidated statements of operations, stockholders' equity, and cash
flows for the twelve (12) months ended December 31, 1998, (iii) state that
PricewaterhouseCoopers LLP has performed the procedures set out in Statement on
Auditing Standards No. 71 ("SAS 71") for a review of interim financial
information and providing the report of PricewaterhouseCoopers LLP as described
in SAS 71 on the financial statements for each of the quarters in the twelve
quarter period ended December 31, 1998 (the "Quarterly Financial Statements"),
(iv) state that in the course of such review, nothing came to their attention
that leads them to believe that any material modifications need to be made to
any of the Quarterly Financial Statements in order for them to be in compliance
with generally accepted accounting principles consistently applied across the
periods presented, and (v) address other matters agreed upon by
PricewaterhouseCoopers LLP and you. In addition, you shall have received from
PricewaterhouseCoopers LLP a letter addressed to the Company and made available
to you for the use of the Underwriters stating that their review of the
Company's system of internal accounting controls, to the extent they deemed
necessary in establishing the scope of their examination of the Company's
consolidated financial statements as of December 31, 1998, did not disclose any
weaknesses in internal controls that they considered to be material weaknesses.

                                       19
<PAGE>
 
              (h)  You shall have received on the Closing Date and on any later
date on which Option Shares are to be purchased, as the case may be, a
certificate of the Company, dated the Closing Date or such later date on which
Option Shares are to be purchased, as the case may be, signed by the Chief
Executive Officer and Chief Financial Officer of the Company, to the effect
that, and you shall be satisfied that:

                   (i)  The representations and warranties of the Company in
     this Agreement are true and correct, as if made on and as of the Closing
     Date or any later date on which Option Shares are to be purchased, as the
     case may be, and the Company has complied with all the agreements and
     satisfied all the conditions on its part to be performed or satisfied at or
     prior to the Closing Date or any later date on which Option Shares are to
     be purchased, as the case may be;

                   (ii) No stop order suspending the effectiveness of the
     Registration Statement has been issued and no proceedings for that purpose
     have been instituted or are pending or threatened under the Act;

                   (iii)  When the Registration Statement became effective and
     at all times subsequent thereto up to the delivery of such certificate, the
     Registration Statement and the Prospectus, and any amendments or
     supplements thereto, contained all material information required to be
     included therein by the Act and the Rules and Regulations and in all
     material respects conformed to the requirements of the Act and the Rules
     and Regulations, the Registration Statement, and any amendment or
     supplement thereto, did not and does not include any untrue statement of a
     material fact or omit to state a material fact required to be stated
     therein or necessary to make the statements therein not misleading, the
     Prospectus, and any amendment or supplement thereto, did not and does not
     include any untrue statement of a material fact or omit to state a material
     fact necessary to make the statements therein, in the light of the
     circumstances under which they were made, not misleading, and, since the
     effective date of the Registration Statement, there has occurred no event
     required to be set forth in an amended or supplemented Prospectus which has
     not been so set forth; and

                   (iv) Subsequent to the respective dates as of which
     information is given in the Registration Statement and Prospectus, there
     has not been (a) any material adverse change in the condition (financial or
     otherwise), earnings, operations, business or business prospects of the
     Company and its subsidiaries considered as one enterprise, (b) any
     transaction that is material to the Company and its subsidiaries considered
     as one enterprise, except transactions entered into in the ordinary course
     of business, (c) any obligation, direct or contingent, that is material to
     the Company and its subsidiaries considered as one enterprise, incurred by
     the Company or its subsidiaries, except obligations incurred in the
     ordinary course of business, (d) any change in the capital stock or
     outstanding indebtedness of the Company or any of its subsidiaries that is
     material to the Company and its subsidiaries considered as one enterprise,
     (e) any dividend or distribution of any kind declared, paid or made on the
     capital stock of the Company or any of its subsidiaries, or (f) any loss or
     damage (whether or not insured) to the property of the Company or any of
     its subsidiaries which has been sustained or will have been sustained which
     has a material adverse effect on the condition (financial or otherwise),
     earnings, operations, business or business prospects of the Company and its
     subsidiaries considered as one enterprise.

              (i)  You shall be satisfied that, and you shall have received a
certificate, dated the Closing Date from the Attorneys for the Selling
Stockholders to the effect that, as of the Closing Date, they have not been
informed that:

                   (i)  The representations and warranties made by such Selling
     Stockholders herein are not true or correct in any material respect on the
     Closing Date; or

                   (ii) Such Selling Stockholders have not complied with any
     obligation or satisfied any condition which is required to be performed or
     satisfied on the part of such Selling Stockholders at or prior to the
     Closing Date.

              (j)  The Company shall have obtained and delivered to you the 
Lock-up Agreements.

                                       20
<PAGE>
 
              (k)  The Company and the Selling Stockholder shall have furnished
to you such further certificates and documents as you shall reasonably request
(including certificates of officers of the Company, the Selling Stockholders or
officers of the Selling Stockholders (when the Selling Stockholder is not a
natural person) as to the accuracy of the representations and warranties of the
Company and the Selling Stockholders herein, as to the performance by the
Company and the Selling Stockholders of their respective obligations hereunder
and as to the other conditions concurrent and precedent to the obligations of
the Underwriters hereunder.

          All such opinions, certificates, letters and documents will be in
compliance with the provisions hereof only if they are reasonably satisfactory
to Underwriters' Counsel.  The Company and the Selling Stockholders will furnish
you with such number of conformed copies of such opinions, certificates, letters
and documents as you shall reasonably request.

      7.  Option Shares.
          ------------- 

              (a)  On the basis of the representations, warranties and
     agreements herein contained, but subject to the terms and conditions herein
     set forth, certain of the Selling Stockholders hereby grant to the several
     Underwriters, for the purpose of covering over-allotments in connection
     with the distribution and sale of the Firm Shares only, a nontransferable
     option to purchase such number of ________ Option Shares as are set forth
     opposite each such Selling Stockholder's name on Schedule B, at the
                                                      ----------
     purchase price per share for the Firm Shares set forth in Section 3 hereof.
     Such option may be exercised by the Representatives on behalf of the
     several Underwriters on one (1) or more occasions in whole or in part
     during the period of thirty (30) days after the date on which the Firm
     Shares are initially offered to the public, by giving written notice to the
     Company. The number of Option Shares to be purchased by each Underwriter
     upon the exercise of such option shall be the same proportion of the total
     number of Option Shares to be purchased by the several Underwriters
     pursuant to the exercise of such option as the number of Firm Shares
     purchased by such Underwriter (set forth in Schedule A hereto) bears to the
                                                 ----------
     total number of Firm Shares purchased by the several Underwriters (set
     forth in Schedule A hereto), adjusted by the Representatives in such manner
              ----------
     as to avoid fractional shares.

          Delivery of definitive certificates for the Option Shares to be
purchased by the several Underwriters pursuant to the exercise of the option
granted by this Section 7 shall be made against payment of the purchase price
therefor by the several Underwriters by wire transfer in same-day funds, payable
to the order of the Selling Stockholders selling Option Shares (and the Selling
Stockholders selling Option Shares agree not to take any action with the purpose
or effect of receiving immediately available funds, until the business day
following the date of its delivery to the Company).  In the event of any breach
of the foregoing, the Selling Stockholders selling Option Shares shall reimburse
the Underwriters for the interest lost and any other expenses borne by them by
reason of such breach.  Such delivery and payment shall take place at the
offices of Skadden, Arps, Slate, Meagher & Flom LLP, 919 Third Avenue, New York,
New York  10022-3897 or at such other place as may be agreed upon among the
Representatives and the Company (i) on the Closing Date, if written notice of
the exercise of such option is received by the Company at least two (2) full
business days prior to the Closing Date, or (ii) on a date which shall not be
later than the third (3rd) full business day following the date the Company
receives written notice of the exercise of such option, if such notice is
received by the Company less than two (2) full business days prior to the
Closing Date.

          The certificates for the Option Shares to be so delivered will be made
available to you at such office or such other location including, without
limitation, in New York City, as you may reasonably request for checking at
least one (1) full business day prior to the date of payment and delivery and
will be in such names and denominations as you may request, such request to be
made at least two (2) full business days prior to such date of payment and
delivery.  If the Representatives so elect, delivery of the Option Shares may be
made by credit through full fast transfer to the accounts at The Depository
Trust Company designated by the Representatives.

          It is understood that you, individually, and not as the
Representatives of the several Underwriters, may (but shall not be obligated to)
make payment of the purchase price on behalf of any Underwriter or Underwriters
whose check or checks shall not have been received by you prior to the date of
payment and delivery for the Option Shares to be purchased by such Underwriter
or Underwriters.  Any such payment by you shall not relieve any such Underwriter
or Underwriters of any of its or their obligations hereunder.

                                       21
<PAGE>
 
              (b)  Upon exercise of any option provided for in Section 7(a)
hereof, the obligations of the several Underwriters to purchase such Option
Shares will be subject (as of the date hereof and as of the date of payment and
delivery for such Option Shares) to the accuracy of and compliance with the
representations, warranties and agreements of the Company and the Selling
Stockholders herein, to the accuracy of the statements of the Company, the
Selling Stockholders and officers of the Company made pursuant to the provisions
hereof, to the performance by the Company and the Selling Stockholders of their
respective obligations hereunder, to the conditions set forth in Section 6
hereof, and to the condition that all proceedings taken at or prior to the
payment date in connection with the sale and transfer of such Option Shares
shall be satisfactory in form and substance to you and to Underwriters' Counsel,
and you shall have been furnished with all such documents, certificates and
opinions as you may request in order to evidence the accuracy and completeness
of any of the representations, warranties or statements, the performance of any
of the covenants or agreements of the Company and the Selling Stockholders or
the satisfaction of any of the conditions herein contained.

      8.  Indemnification and Contribution.
          -------------------------------- 

              (a)  The Company, and each of the Principal Selling Stockholders,
jointly and severally, agrees to indemnify and hold harmless each Underwriter
against any losses, claims, damages or liabilities, joint or several, to which
such Underwriter may become subject (including, without limitation, in its
capacity as an Underwriter or as a "qualified independent underwriter" within
the meaning of Rule 2720 of the Conduct Rules of the NASD), under the Act, the
Exchange Act or otherwise, specifically including, but not limited to, losses,
claims, damages or liabilities (or actions in respect thereof) arising out of or
based upon (i) any breach of any representation, warranty, agreement or covenant
of the Company or the Principal Selling Stockholders herein contained, (ii) any
untrue statement or alleged untrue statement of any material fact contained in
the Registration Statement or any amendment or supplement thereto, or the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, or
(iii) any untrue statement or alleged untrue statement of any material fact
contained in any Preliminary Prospectus or the Prospectus or any amendment or
supplement thereto, or the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein, in the light of the circumstances under which they were made, not
misleading, and agrees to reimburse each Underwriter for any legal or other
expenses reasonably incurred by it in connection with investigating or defending
any such loss, claim, damage, liability or action; provided, however, that the
                                                   --------  -------
Company and the Principal Selling Stockholders shall not be liable in any such
case to the extent that any such loss, claim, damage, liability or action arises
out of or is based upon an untrue statement or alleged untrue statement or
omission or alleged omission made in the Registration Statement, such
Preliminary Prospectus or the Prospectus, or any such amendment or supplement
thereto, in reliance upon, and in conformity with, written information relating
to any Underwriter furnished to the Company by such Underwriter, directly or
through you, specifically for use in the preparation thereof and, provided
further, that the indemnity agreement provided in this Section 8(a) with respect
to any Preliminary Prospectus shall not inure to the benefit of any Underwriter
from whom the person asserting any losses, claims, damages, liabilities or
actions based upon any untrue statement or alleged untrue statement of material
fact or omission or alleged omission to state therein a material fact purchased
Shares, if a copy of the Prospectus in which such untrue statement or alleged
untrue statement or omission or alleged omission was corrected had not been sent
or given to such person within the time required by the Act and the Rules and
Regulations, unless such failure is the result of noncompliance by the Company
with Section 4(d) hereof.

          The indemnity agreement in this Section 8(a) shall extend upon the
same terms and conditions to, and shall inure to the benefit of, each person, if
any, who controls any Underwriter within the meaning of the Act or the Exchange
Act.  This indemnity agreement shall be in addition to any liabilities which the
Company may otherwise have.

              (b)  Each of the Selling Stockholders (other than the Principal
Selling Stockholders, whose indemnification obligations hereunder are set forth
in Section 8(a) above) agree to indemnify and hold harmless each Underwriter
against any losses, claims, damages or liabilities, joint or several, to which
such Underwriter may become subject (including, without limitation, in its
capacity as an Underwriter or as a "qualified independent underwriter" within
the meaning of Rule 2720 of the Conduct Rules of the NASD) under the Act, the
Exchange Act or otherwise, specifically including, but not limited to, losses,
claims, damages or liabilities (or actions in respect thereof) arising out of or
based upon (i) any breach of any representation, warranty, agreement or covenant
of such Selling Stockholder herein contained, (ii) any untrue statement or
alleged untrue statement of any 

                                       22
<PAGE>
 
material fact contained in the Registration Statement or any amendment or
supplement thereto, or the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, or (iii) any untrue statement or alleged untrue
statement of any material fact contained in any Preliminary Prospectus or the
Prospectus or any amendment or supplement thereto, or the omission or alleged
omission to state therein a material fact necessary to make the statements
therein, in the light of the circumstances under which they were made, not
misleading, in the case of subparagraphs (ii) and (iii) of this Section 8(b) to
the extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in reliance upon and in
conformity with written information furnished to the Company or such Underwriter
by such Selling Stockholder, directly or through such Selling Stockholder's
representatives, specifically for use in the preparation thereof, and agrees to
reimburse each Underwriter for any legal or other expenses reasonably incurred
by it in connection with investigating or defending any such loss, claim,
damage, liability or action; provided, however, that the indemnity agreement
                             --------  -------          
provided in this Section 8(b) with respect to any Preliminary Prospectus shall
not inure to the benefit of any Underwriter from whom the person asserting any
losses, claims, damages, liabilities or actions based upon any untrue statement
or alleged untrue statement of a material fact or omission or alleged omission
to state therein a material fact purchased Shares, if a copy of the Prospectus
in which such untrue statement or alleged untrue statement or omission or
alleged omission was corrected had not been sent or given to such person within
the time required by the Act and the Rules and Regulations, unless such failure
is the result of noncompliance by the Company with Section 4(d) hereof.

          The indemnity agreement in this Section 8(b) shall extend upon the
same terms and conditions to, and shall inure to the benefit of, each person, if
any, who controls any Underwriter within the meaning of the Act or the Exchange
Act.  This indemnity agreement shall be in addition to any liabilities which
such Selling Stockholder may otherwise have.

              (c)  Each Underwriter, severally and not jointly, agrees to
indemnify and hold harmless the Company and each of the Selling Stockholders
against any losses, claims, damages or liabilities, joint or several, to which
the Company or such Selling Stockholder may become subject under the Act or
otherwise, specifically including, but not limited to, losses, claims, damages
or liabilities (or actions in respect thereof) arising out of or based upon (i)
any breach of any representation, warranty, agreement or covenant of such
Underwriter herein contained, (ii) any untrue statement or alleged untrue
statement of any material fact contained in the Registration Statement or any
amendment or supplement thereto, or the omission or alleged omission to state
therein a material fact required to be stated therein or necessary to make the
statements therein not misleading, or (iii) any untrue statement or alleged
untrue statement of any material fact contained in any Preliminary Prospectus or
the Prospectus or any amendment or supplement thereto, or the omission or
alleged omission to state therein a material fact necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading, in the case of subparagraphs (ii) and (iii) of this
Section 8(c) to the extent, but only to the extent, that such untrue statement
or alleged untrue statement or omission or alleged omission was made in reliance
upon and in conformity with written information furnished to the Company by such
Underwriter, directly or through you, specifically for use in the preparation
thereof, and agrees to reimburse the Company and the such Selling Stockholders
for any legal or other expenses reasonably incurred by the Company and such
Selling Stockholders in connection with investigating or defending any such
loss, claim, damage, liability or action.

          The indemnity agreement in this Section 8(c) shall extend upon the
same terms and conditions to, and shall inure to the benefit of, each officer of
the Company who signed the Registration Statement and each director of the
Company, the Selling Stockholders and each person, if any, who controls the
Company or the Selling Stockholders within the meaning of the Act or the
Exchange Act.  This indemnity agreement shall be in addition to any liabilities
which each Underwriter may otherwise have.

              (d)  Promptly after receipt by an indemnified party under this
Section 8 of notice of the commencement of any action, such indemnified party
shall, if a claim in respect thereof is to be made against any indemnifying
party under this Section 8, notify the indemnifying party in writing of the
commencement thereof but the omission so to notify the indemnifying party will
not relieve it from any liability which it may have to any indemnified party
otherwise than under this Section 8. In case any such action is brought against
any indemnified party, and it notified the indemnifying party of the
commencement thereof, the indemnifying party will be entitled to participate
therein and, to the extent that it shall elect by written notice delivered to
the indemnified party promptly after receiving the aforesaid notice from such
indemnified party, to assume the defense thereof, with counsel 

                                       23
<PAGE>
 
reasonably satisfactory to such indemnified party; provided, however, that if 
                                                   --------  ------- 
the defendants in any such action include both the indemnified party and the
indemnifying party and the indemnified party shall have reasonably concluded
that there may be legal defenses available to it and/or other indemnified
parties which are different from or additional to those available to the
indemnifying party, the indemnified party or parties shall have the right to
select separate counsel to assume such legal defenses and to otherwise
participate in the defense of such action on behalf of such indemnified party or
parties. Upon receipt of notice from the indemnifying party to such indemnified
party of the indemnifying party's election so to assume the defense of such
action and approval by the indemnified party of counsel, the indemnifying party
will not be liable to such indemnified party under this Section 8 for any legal
or other expenses subsequently incurred by such indemnified party in connection
with the defense thereof unless (i) the indemnified party shall have employed
separate counsel in accordance with the proviso to the next preceding sentence
(it being understood, however, that the indemnifying party shall not be liable
for the expenses of more than one separate counsel (together with appropriate
local counsel) approved by the indemnifying party representing all the
indemnified parties under Section 8(a), 8(b) or 8(c) hereof who are parties to
such action), (ii) the indemnifying party shall not have employed counsel
satisfactory to the indemnified party to represent the indemnified party within
a reasonable time after notice of commencement of the action or (iii) the
indemnifying party has authorized the employment of counsel for the indemnified
party at the expense of the indemnifying party. In no event shall any
indemnifying party be liable in respect of any amounts paid in settlement of any
action unless the indemnifying party shall have approved the terms of such
settlement; provided that such consent shall not be unreasonably withheld. No
indemnifying party shall, without the prior written consent of the indemnified
party, effect any settlement of any pending or threatened proceeding in respect
of which any indemnified party is or could have been a party and indemnification
could have been sought hereunder by such indemnified party, unless such
settlement includes an unconditional release of such indemnified party from all
liability on all claims that are the subject matter of such proceeding.

              (e)  In order to provide for just and equitable contribution in 
any action in which a claim for indemnification is made pursuant to this Section
8 but it is judicially determined (by the entry of a final judgment or decree by
a court of competent jurisdiction and the expiration of time to appeal or the
denial of the last right of appeal) that such indemnification may not be
enforced in such case notwithstanding the fact that this Section 8 provides for
indemnification in such case, all the parties hereto shall contribute to the
aggregate losses, claims, damages or liabilities to which they may be subject
(after contribution from others) in such proportion so that, except as set forth
in Section 8(f) hereof, the Underwriters severally and not jointly are
responsible pro rata for the portion represented by the percentage that the
underwriting discount bears to the initial public offering price, and the
Company and the Selling Stockholders are responsible for the remaining portion,
provided, however, that (i) no Underwriter shall be required to contribute any
- --------  -------             
amount in excess of the amount by which the underwriting discount applicable to
the Shares purchased by such Underwriter exceeds the amount of damages which
such Underwriter has otherwise required to pay and (ii) no person guilty of a
fraudulent misrepresentation (within the meaning of Section 11(f) of the Act)
shall be entitled to contribution from any person who is not guilty of such
fraudulent misrepresentation. The contribution agreement in this Section 8(e)
shall extend upon the same terms and conditions to, and shall inure to the
benefit of, each person, if any, who controls any Underwriter, the Company or
the Selling Stockholders within the meaning of the Act or the Exchange Act and
each officer of the Company who signed the Registration Statement and each
director of the Company.

              (f)  The liability of each Selling Stockholder, including the
Principal Selling Stockholders, under the representations, warranties and
agreements contained herein and under the indemnity agreements contained in the
provisions of this Section 8 shall be limited to an amount equal to the initial
public offering price of the Selling Stockholder Shares sold by each such
Selling Stockholder to the Underwriters minus the amount of the underwriting
discount paid thereon to the Underwriters by such Selling Stockholder. The
Company and such Selling Stockholders may agree, as among themselves and without
limiting the rights of the Underwriters under this Agreement, as to the
respective amounts of such liability for which they each shall be responsible.

              (g)  The parties to this Agreement hereby acknowledge that they
are sophisticated business persons who were represented by counsel during the
negotiations regarding the provisions hereof including, without limitation, the
provisions of this Section 8, and are fully informed regarding said provisions.
They further acknowledge that the provisions of this Section 8 fairly allocate
the risks in light of the ability of the parties to investigate the Company and
its business in order to assure that adequate disclosure is made in the
Registration Statement and Prospectus as required by the Act and the Exchange
Act.

                                       24
<PAGE>
 
      9.  Representations, Warranties, Covenants and Agreements to Survive 
          -----------------------------------------------------------------
          Delivery.  All representations, warranties, covenants and agreements 
          --------   
of the Company, the Selling Stockholders and the Underwriters herein or in
certificates delivered pursuant hereto, and the indemnity and contribution
agreements contained in Section 8 hereof shall remain operative and in full
force and effect regardless of any investigation made by or on behalf of any
Underwriter or any person controlling any Underwriter within the meaning of the
Act or the Exchange Act, or by or on behalf of the Company or the Selling
Stockholders, or any of their officers, directors or controlling persons within
the meaning of the Act or the Exchange Act, and shall survive the delivery of
the Shares to the several Underwriters hereunder or termination of this
Agreement.

      10.  Substitution of Underwriters.  If any Underwriter or Underwriters 
           ----------------------------  
shall fail to take up and pay for the number of Firm Shares agreed by such
Underwriter or Underwriters to be purchased hereunder upon tender of such Firm
Shares in accordance with the terms hereof, and if the aggregate number of Firm
Shares which such defaulting Underwriter or Underwriters so agreed but failed to
purchase does not exceed 10% of the Firm Shares, the remaining Underwriters
shall be obligated, severally in proportion to their respective commitments
hereunder, to take up and pay for the Firm Shares of such defaulting Underwriter
or Underwriters.

          If any Underwriter or Underwriters so defaults and the aggregate
number of Firm Shares which such defaulting Underwriter or Underwriters agreed
but failed to take up and pay for exceeds 10% of the Firm Shares, the remaining
Underwriters shall have the right, but shall not be obligated, to take up and
pay for (in such proportions as may be agreed upon among them) the Firm Shares
which the defaulting Underwriter or Underwriters so agreed but failed to
purchase.  If such remaining Underwriters do not, at the Closing Date, take up
and pay for the Firm Shares which the defaulting Underwriter or Underwriters so
agreed but failed to purchase, the Closing Date shall be postponed for twenty-
four (24) hours to allow the several Underwriters the privilege of substituting
within twenty-four (24) hours (including non-business hours) another underwriter
or underwriters (which may include any nondefaulting Underwriter) satisfactory
to the Company.  If no such underwriter or underwriters shall have been
substituted as aforesaid by such postponed Closing Date, the Closing Date may,
at the option of the Company, be postponed for a further twenty-four (24) hours,
if necessary, to allow the Company the privilege of finding another underwriter
or underwriters, satisfactory to you, to purchase the Firm Shares which the
defaulting Underwriter or Underwriters so agreed but failed to purchase.  If it
shall be arranged for the remaining Underwriters or substituted underwriter or
underwriters to take up the Firm Shares of the defaulting Underwriter or
Underwriters as provided in this Section 10, (i) the Company shall have the
right to postpone the time of delivery for a period of not more than seven (7)
full business days, in order to effect whatever changes may thereby be made
necessary in the Registration Statement or the Prospectus, or in any other
documents or arrangements, and the Company agrees promptly to file any
amendments to the Registration Statement, supplements to the Prospectus or other
such documents which may thereby be made necessary, and (ii) the respective
number of Firm Shares to be purchased by the remaining Underwriters and
substituted underwriter or underwriters shall be taken as the basis of their
underwriting obligation.  If the remaining Underwriters shall not take up and
pay for all such Firm Shares so agreed to be purchased by the defaulting
Underwriter or Underwriters or substitute another underwriter or underwriters as
aforesaid and the Company shall not find or shall not elect to seek another
underwriter or underwriters for such Firm Shares as aforesaid, then this
Agreement shall terminate.

          In the event of any termination of this Agreement pursuant to the
preceding paragraph of this Section 10, neither the Company nor the Selling
Stockholders shall be liable to any Underwriter (except as provided in Sections
5 and 8 hereof) nor shall any Underwriter (other than an Underwriter who shall
have failed, otherwise than for some reason permitted under this Agreement, to
purchase the number of Firm Shares agreed by such Underwriter to be purchased
hereunder, which Underwriter shall remain liable to the Company, the Selling
Stockholders and the other Underwriters for damages, if any, resulting from such
default) be liable to the Company or the Selling Stockholders (except to the
extent provided in Sections 5 and 8 hereof).

          The term "Underwriter" in this Agreement shall include any person
substituted for an Underwriter under this Section 10.

      11.  Effective Date of this Agreement and Termination.
           ------------------------------------------------ 

                   (a)  This Agreement shall become effective at the earlier of
     (i) 9:30 A.M., New York time, on the first full business day following the
     effective date of the Registration Statement, or (ii) the time of the

                                       25
<PAGE>
 
     initial public offering of any of the Shares by the Underwriters after the
     Registration Statement becomes effective. The time of the initial public
     offering shall mean the time of the release by you, for publication, of the
     first newspaper advertisement relating to the Shares, or the time at which
     the Shares are first generally offered by the Underwriters to the public by
     letter, telephone, telegram or telecopy, whichever shall first occur. By
     giving notice as set forth in Section 12 before the time this Agreement
     becomes effective, you, as Representatives of the several Underwriters, or
     the Company, may prevent this Agreement from becoming effective without
     liability of any party to any other party, except as provided in Sections
     4(i), 5 and 8 hereof.

                   (b)  You, as Representatives of the several Underwriters,
     shall have the right to terminate this Agreement by giving notice as
     hereinafter specified at any time on or prior to the Closing Date or on or
     prior to any later date on which Option Shares are to be purchased, as the
     case may be, (i) if the Company or the Selling Stockholders shall have
     failed, refused or been unable to perform any agreement on its part to be
     performed, or because any other condition of the Underwriters' obligations
     hereunder required to be fulfilled is not fulfilled, including, without
     limitation, any change in the condition (financial or otherwise), earnings,
     operations, business or business prospects of the Company and its
     subsidiaries considered as one enterprise from that set forth in the
     Registration Statement or Prospectus, which, in your sole judgment, is
     material and adverse, or (ii) if additional material governmental
     restrictions, not in force and effect on the date hereof, shall have been
     imposed upon trading in securities generally or minimum or maximum prices
     shall have been generally established on the New York Stock Exchange or on
     the American Stock Exchange or in the over the counter market by the NASD,
     or trading in securities generally shall have been suspended on either such
     exchange or in the over the counter market by the NASD, or if a banking
     moratorium shall have been declared by federal, New York or California
     authorities, or (iii) if the Company shall have sustained a loss by strike,
     fire, flood, earthquake, accident or other calamity of such character as to
     interfere materially with the conduct of the business and operations of the
     Company regardless of whether or not such loss shall have been insured, or
     (iv) if there shall have been a material adverse change in the general
     political or economic conditions or financial markets as in your reasonable
     judgment makes it inadvisable or impracticable to proceed with the
     offering, sale and delivery of the Shares, or (v) if there shall have been
     an outbreak or escalation of hostilities or of any other insurrection or
     armed conflict or the declaration by the United States of a national
     emergency which, in the reasonable opinion of the Representatives, makes it
     impracticable or inadvisable to proceed with the public offering of the
     Shares as contemplated by the Prospectus. In the event of termination
     pursuant to subparagraph (i) above, the Company shall remain obligated to
     pay costs and expenses pursuant to Sections 4(i), 5 and 8 hereof. Any
     termination pursuant to any of subparagraphs (ii) through (v) above shall
     be without liability of any party to any other party except as provided in
     Sections 5 and 8 hereof.

          If you elect to prevent this Agreement from becoming effective or to
terminate this Agreement as provided in this Section 11, you shall promptly
notify the Company by telephone, telecopy or telegram, in each case confirmed by
letter.  If the Company shall elect to prevent this Agreement from becoming
effective, the Company shall promptly notify you by telephone, telecopy or
telegram, in each case, confirmed by letter.

      12.  Notices.  All notices or communications hereunder, except as herein
           -------                                                            
otherwise specifically provided, shall be in writing and if sent to you shall be
mailed, delivered, telegraphed (and confirmed by letter) or telecopied (and
confirmed by letter) to you c/o BancBoston Robertson Stephens, 555 California
Street, Suite 2600, San Francisco, California 94104, telecopier number (415)
781-0278, Attention:  General Counsel; if sent to the Company, such notice shall
be mailed, delivered, telegraphed (and confirmed by letter) or telecopied (and
confirmed by letter) to Knight/Trimark Group, Inc., Newport Tower, 525
Washington Blvd., Jersey City, New Jersey 07310, telecopier number (201) 222-
1799, Attention: Kenneth Pasternak, Chief Executive Officer; if sent to the
Selling Stockholders, such notice shall be sent mailed, delivered, telegraphed
(and confirmed by letter) or telecopied (and confirmed by letter) to Michael T.
Dorsey and Robert I. Turner, as Attorneys-in-Fact for the Selling Stockholders,
at Newport Tower, 525 Washington Boulevard, Jersey City, New Jersey 07310,
telecopier number (201) 222-1799.

      13.  Parties.  This Agreement shall inure to the benefit of and be 
           -------
binding upon the several Underwriters and the Company and the Selling
Stockholders and their respective executors, administrators, successors and
assigns. Nothing expressed or mentioned in this Agreement is intended or shall
be construed to give any person or entity, other than the parties hereto and
their respective executors, administrators, successors and assigns, and the
controlling persons within the meaning of the Act or the Exchange Act, officers
and directors referred to in Section 8 hereof, any legal or equitable right,
remedy or claim in respect of this Agreement or any provisions herein contained,
this Agreement and all conditions and provisions hereof being intended to be and
being for the sole and

                                       26
<PAGE>
 
exclusive benefit of the parties hereto and their respective executors,
administrators, successors and assigns and said controlling persons and said
officers and directors, and for the benefit of no other person or entity. No
purchaser of any of the Shares from any Underwriter shall be construed a
successor or assign by reason merely of such purchase.

          In all dealings with the Company and the Selling Stockholders under
this Agreement, you shall act on behalf of each of the several Underwriters, and
the Company and the Selling Stockholders shall be entitled to act and rely upon
any statement, request, notice or agreement made or given by you jointly or by
BancBoston Robertson Stephens on behalf of you.

      14.  Applicable Law.  This Agreement shall be governed by, and construed 
           --------------
in accordance with, the laws of the State of New York.

      15.  Counterparts.  This Agreement may be signed in several counterparts, 
           ------------ 
each of which will constitute an original.


                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       27
<PAGE>
 
          If the foregoing correctly sets forth the understanding among the
Company, the Selling Stockholder and the several Underwriters, please so
indicate in the space provided below for that purpose, whereupon this letter
shall constitute a binding agreement among the Company, the Selling Stockholder
and the several Underwriters.

                                    Very truly yours,


                                    KNIGHT/TRIMARK GROUP, INC.


                                    By: _____________________________________


                                    SELLING STOCKHOLDERS


                                    By: _____________________________________
                                        Attorney-in-Fact for the Selling
                                        Stockholders


                                    DISCOVER BROKERAGE DIRECT, INC.


                                    By: _____________________________________



Accepted as of the date first above written:

BANCBOSTON ROBERTSON STEPHENS INC.
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
PAINEWEBBER INCORPORATED
ABN AMRO INCORPORATED
SOUTHWEST SECURITIES, INC.
On their behalf and on behalf of each of the
several Underwriters named in Schedule A hereto.
                              ----------        

By: BANCBOSTON ROBERTSON STEPHENS INC.


By: _____________________________
        Authorized Signatory


                                       28
<PAGE>
 
                                  SCHEDULE A
<TABLE> 
<CAPTION>
                                                                                          Number of Firm Shares
Underwriters                                                                              To Be Purchased    
- ----------------------------------------------------------------------------------------  ----------------------
<S>                                                                                      <C>
BANCBOSTON ROBERTSON STEPHENS..........................................................
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED.....................................
PAINEWEBBER INCORPORATED...............................................................
ABN AMRO INCORPORATED..................................................................
SOUTHWEST SECURITIES, INC..............................................................
TOTAL
</TABLE>

                                       29
<PAGE>
 
                                  SCHEDULE B

<TABLE>
<CAPTION>

Selling Stockholder                                                            Shares Offered
- -------------------                                                            -------------- 
<S>                                                                         <C>
Steven L. Steinman........................................................           450,000    
Kenneth D. Pasternak......................................................           450,000    
Walter F. Raquet..........................................................           450,000    
Robert M. Lazarowitz......................................................           450,000    
Anthony M. Sanfilippo.....................................................            50,000    
E*TRADE Securities, Inc...................................................           750,000    
Discover Brokerage Direct, Inc............................................           900,000    
Waterhouse Investor Services, Inc.........................................           900,000    
BHF Securities Corporation................................................            75,000    
Bidwell & Company.........................................................            50,000    
Brown & Company Securities Investments....................................           394,887    
Cowles Family Trust.......................................................            17,485    
Dain Rauscher Incorporated................................................           460,192    
David A. Noyes & Company..................................................            25,000    
Howe Barnes Investments, Inc..............................................            75,000    
J.W. Charles Financial Services, Inc......................................           225,000    
NL Holding Corporation....................................................           125,970    
Primevest Financial Services, Inc.........................................            62,000    
The R.J. Forbes Group, Inc................................................           288,948    
R.P. Assignee Corp........................................................            50,000    
Sanders Morris Mundy Inc..................................................           134,566    
Thomas F. White & Co......................................................            46,000    
Van Kasper & Co...........................................................            50,000    
WBM, LLC..................................................................            83,500    
William L. and Diane E. Sabol.............................................            28,700    
William Lewke.............................................................            26,615    
Howard Braff..............................................................             1,500    
William Forsgren..........................................................               782    
Raymond Pawloski..........................................................             5,000     
</TABLE>

                                       30
<PAGE>
 
                                  SCHEDULE C

Steven L. Steinman

Kenneth D. Pasternak

Walter Raquet

Robert Lazarowitz

Anthony Sanfilippo

                                       31

<PAGE>
 

                                                                    EXHIBIT 23.1


                      CONSENT OF INDEPENDENT ACCOUNTANTS
                      ----------------------------------

We hereby consent to the use in this Amendment No. 3 to the Prospectus
constituting part of this Registration Statement on Form S-1 of our report dated
January 19, 1999, relating to the consolidated financial statements of
Knight/Trimark Group, Inc., which appears in such Prospectus. We also consent to
the reference to us under the heading "Experts" in such Prospectus.



PricewaterhouseCoopers LLP

New York, New York
February 25, 1999


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