Document:

<PAGE>

                                                                    Exhibit 10.5

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                            EQUITY PURCHASE AGREEMENT

                                     between

                               ICONIXX CORPORATION

                                       and

                          THAYER ITECH HOLDINGS, L.L.C.

                                       and

                                TC ITECH, L.L.C.

                              Dated March 22, 2000

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<PAGE>

LIST OF EXHIBITS
----------------
Exhibit A     Amended and Restated Certificate of Incorporation of Iconixx
              Corporation
Exhibit B     Capitalization Schedule

                                      -i-
<PAGE>

                              PURCHASE AGREEMENT
                              ------------------

     THIS AGREEMENT is made as of March 22, 2000, between ICONIXX CORPORATION, a
Delaware corporation (formerly, Empyrean Group Holdings, Inc.) (the "Company"),
THAYER ITECH HOLDINGS, L.L.C., a Delaware limited liability company ("Thayer
Holdings"), and each of the other persons or entities set forth in the Schedule
                                                                       --------
of Purchasers attached hereto (collectively with Thayer Holdings, the
-------------
"Purchasers" and individually a "Purchaser"). Except as otherwise indicated
herein, capitalized terms used herein are defined in Section 7 hereof.
                                                     ---------

                                   Recitals:
                                   --------

     At the Closing, the Purchasers desire to purchase from the Company, and the
Company desires to sell to the Purchasers (i) an aggregate of 16,100 shares of
the Company's Class A Preferred Stock, par value $.01 per share (the "Class A
Preferred") and (ii) an aggregate of 3,000,000 shares of the Company's Common
Stock, $.01 par value per share (the "Common"), in the amount set forth opposite
each Purchaser's name on the Schedule of Purchasers attached hereto.
                             ----------------------

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

                                   ARTICLE I
                           AUTHORIZATION AND CLOSING
                           -------------------------

     1.1 Authorization of the Stock. The Company shall authorize the issuance
         --------------------------
and sale to the Purchasers of up to an aggregate of 16,100 shares of Class A
Preferred and an aggregate of 3,000,000 shares of Common, each having the rights
and preferences set forth in Exhibit A attached hereto. The Class A Preferred
                             ---------
and the Common are collectively referred to herein as the "Stock."

     1.2 Purchase and Sale of the Stock at Closing.
         -----------------------------------------

         (a) Purchase of Stock. Subject to the terms and conditions set forth in
             -----------------
this Section 1.2 and in Section 2.1, at the Closing, the Company shall sell to
     -----------        -----------
each Purchaser and, each Purchaser shall purchase from the Company:

             (i)   that number of shares of the Class A Preferred set forth
     opposite such Purchaser's name in the Schedule of Purchasers attached
                                           ----------------------
     hereto, at a purchase price of $1,000 per share; and
<PAGE>

             (ii)  that number of shares of the Common set forth opposite such
     Purchaser's name set forth in the Schedule of Purchasers attached hereto,
     at a purchase price of $1.30 per share.

         (b) Use of Proceeds of Purchase. The funds obtained by the Company from
             ---------------------------
the Purchasers at the Closing shall, together with debt financing provided by
First Union National Bank, N.A. and NationsBank, National Association pursuant
to the Credit Agreement dated August 12, 1999, as amended, between Lender, the
Company and its Subsidiaries, be used to (i) finance the Company's costs of
consummating the acquisitions of the assets of EnterpriseWorks, LLC and Internet
Information Systems, Inc. (the "Acquisitions") and (ii) provide funds for the
Company's working capital requirements.

         (c) Closing. The closing of the purchase and sale of the Stock to be
             -------
purchased pursuant to Sections 1.2(a) (the "Closing") shall take place at the
                      ---------------
offices of Hogan & Hartson, LLP, 555 Thirteenth Street, NW, Washington, D.C.,
20004 at 10:00 a.m. on March 23, 2000 or at such other place or on such other
date as may be mutually agreeable to the Company and the Purchasers. At the
Closing, the Company shall deliver to each Purchaser stock certificates
evidencing the Stock to be purchased by such Purchaser, registered in such
Purchaser's name, upon payment of the purchase price thereof by, at the
Company's option, either a cashier's or certified check, or by wire transfer of
immediately available funds to such account as designated by the Company.

                                   ARTICLE II
                    CONDITIONS OF THE PURCHASERS' OBLIGATIONS
                                   AT CLOSING

     2.1 Closing Conditions. The obligation of the Purchasers to purchase and
         ------------------
pay for the Stock at the Closing is subject to the satisfaction as of the
Closing of the following conditions:

         (a) Representations and Warranties, Covenants. The representations and
             -----------------------------------------
warranties contained in Section 5 hereof shall be true and correct at and as of
                        ---------
the Closing as though then made, except to the extent of changes caused by the
transactions expressly contemplated herein; and the Company shall have performed
in all material respects all of the covenants required to be performed by it
hereunder prior to the Closing.

         (b) Consummation of Acquisitions. The Company shall have entered into
             ----------------------------
at least one of the two definitive purchase agreements with respect to the
Acquisitions and such Acquisition Agreement(s) shall be in full force and effect
as of the Closing.

         (c) Compliance with Applicable Laws. The purchase of Stock by the
             -------------------------------
Purchasers hereunder shall not be prohibited by any applicable law or
governmental regulation, shall not subject the Purchasers to any penalty,
liability or, in the Purchasers' sole judgment, other onerous conditions under
or pursuant to any applicable law or governmental regulation, and

                                      -2-
<PAGE>

shall be permitted by laws and regulations of the jurisdictions to which the
Purchasers are subject.

         (d) Waiver. Any condition specified in this Section 2.1 may be waived
             ------
only if such waiver is set forth in a writing executed by the Purchasers.

         (e) Board Approval. The Board shall have approved the purchase of Stock
             --------------
by the Purchasers and the use of proceeds, including the consummation of the
Acquisitions.

                                  ARTICLE III
                                   COVENANTS
                                   ---------

     3.1 Intentionally Left Blank.
         ------------------------

                                  ARTICLE IV
                       TRANSFER OF RESTRICTED SECURITIES
                       ---------------------------------

     4.1 Transfer of Restricted Securities.
         ---------------------------------

         (a) Restricted Securities are transferable only pursuant to (i) public
offerings registered under the Securities Act, (ii) Rule 144 or Rule 144A of the
Securities Act (or any similar rule or rules then in force) if such rule or
rules are available and (iii) subject to the conditions specified in Section
                                                                     -------
4.1(b) below, any other legally available means of transfer.
------

         (b) In connection with the transfer of any Restricted Securities (other
than a transfer described in Section 4.1(a)(i) or (ii) above), the holder
                             -----------------    ----
thereof shall deliver written notice to the Company describing in reasonable
detail the transfer or proposed transfer, together with an opinion of Hogan &
Hartson LLP, or other counsel which (to the Company's reasonable satisfaction)
is knowledgeable in securities law matters to the effect that such transfer of
Restricted Securities may be effected without registration of such Restricted
Securities under the Securities Act. In addition, if the holder of the
Restricted Securities delivers to the Company an opinion of Hogan & Hartson LLP,
or such other counsel that no subsequent transfer of such Restricted Securities
shall require registration under the Securities Act, the Company shall promptly
upon such contemplated transfer deliver new certificates for such Restricted
Securities which do not bear a customary Securities Act legend. If the Company
is not required to deliver new certificates for such Restricted Securities not
bearing such legend, the holder thereof shall not transfer the same until the
prospective transferee has confirmed to the Company in writing its agreement to
be bound by the conditions contained in this Section 4.1 and Section 6.1.
                                             -----------     -----------

         (c) Upon the request of the Purchaser, the Company shall promptly
supply to the Purchasers or their respective prospective transferees all
information regarding the

                                      -3-
<PAGE>

Company required to be delivered in connection with a transfer pursuant to Rule
144A of the Securities Act.

                                   ARTICLE V
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
                 ---------------------------------------------

     As a material inducement to the Purchasers to enter into this Agreement and
purchase the Stock, the Company hereby represents and warrants to the Purchasers
that:

     5.1 Organization and Corporate Power. The Company is a corporation duly
         --------------------------------
organized, validly existing and in good standing under the laws of the state of
Delaware and is qualified to do business in every jurisdiction in which the
failure to so qualify might reasonably be expected to have a material adverse
effect on the financial condition, operating results, assets, operations or
business prospects of the Company and its Subsidiaries taken as a whole. The
Company has all requisite corporate power and authority and all material
licenses, permits and authorizations necessary to own and operate its
properties, to carry on its businesses as now conducted and presently proposed
to be conducted and to carry out the transactions contemplated by this
Agreement.

     5.2 Capital Stock and Related Matters.
         ---------------------------------

         (a) As of the Closing and immediately thereafter, the authorized
capital stock of the Company shall consist of 100,000,000 shares of stock, of
which (i) 150,000 shares shall be designated as Class A Preferred and (ii)
99,850,000 shares shall be designated as Common Stock. The issued and
outstanding Class A Preferred Stock and the Common Stock are as set forth on
Exhibit B hereto. As of the Closing, all of the outstanding shares of the
---------
Company's capital stock shall be validly issued, fully paid and nonassessable.

         (b) Based in part on the investment representations of the Purchasers
in Section 6.1 hereof, the offer, sale and issuance of Stock hereunder does not
and will not require registration under the Securities Act or any applicable
state securities laws.

     5.3 Authorization; No Breach. The execution, delivery and performance of
         ------------------------
this Agreement and all other agreements contemplated hereby to which the Company
is a party have been duly authorized by the Company. This Agreement and all
other agreements contemplated hereby each constitutes a valid and binding
obligation of the Company, enforceable in accordance with its terms. The
execution and delivery by the Company of this Agreement and all other agreements
contemplated hereby to which the Company is a party, the offering, sale and
issuance of the Stock hereunder and pursuant to Section 1.2(a), the Amended and
                                                --------------
Restated Certificate of Incorporation and the fulfillment of and compliance with
the respective terms hereof and thereof by the Company do not and will not (i)
conflict with or result in a breach of the terms, conditions or provisions of,
(ii) constitute a default under, (iii) result in the creation of any lien,
security interest, charge or encumbrance upon the Company's capital stock or
assets pursuant to, (iv) give any third party the right to modify, terminate or
accelerate any obligation under, (v) result in a violation of, or (vi) require
any authorization, consent, approval, exemption

                                      -4-
<PAGE>

or other action by or notice to any court or administrative or governmental body
pursuant to, the Certificate of Incorporation or bylaws of the Company, or any
law, statute, rule or regulation to which the Company is subject, or any
agreement, instrument, order, judgment or decree to which the Company is a party
or by which it is bound.

     5.4 Violations of Laws. The Company has not (i) violated any laws or
         ------------------
governmental rules or regulations, which violation would reasonably be expected
to have a material adverse effect upon the financial condition, operating
results, assets, operations or business prospects of the Company; (ii) received
notice of any such material violation; or (iii) become subject to any material
clean up liability, and the Company has no reason to believe it may become
subject to any material clean up liability, under any federal, state or local
environmental law, rule or regulation.

     5.5 Governmental Consent, etc. Except for approvals under the HSR Act, no
         -------------------------
material permit, consent, approval or authorization of, or declaration to or
filing with, any governmental authority is required in connection with the
execution, delivery and performance by the Company of this Agreement or the
other agreements contemplated hereby, or the consummation by the Company of any
other transactions contemplated hereby or thereby including the Acquisitions.

     5.6 Disclosure. Neither this Agreement nor any of the schedules,
         ----------
attachments, written statements, documents, certificates or other items prepared
or supplied to the Purchasers by or on behalf of the Company with respect to the
transactions contemplated hereby contain any untrue statement of a material fact
or omit a material fact necessary to make each statement contained herein or
therein not misleading. There is no fact which the Company has not disclosed to
the Purchasers in writing and of which any of its officers, directors or
executive employees is aware and which has had or might reasonably be
anticipated to have a material adverse effect upon the existing or expected
financial condition, operating results, assets, customer or supplier relations,
employee relations or business prospects of the Company.

                                  ARTICLE VI
                   PURCHASERS REPRESENTATIONS AND WARRANTIES
                   -----------------------------------------

     As a material inducement to the Company to enter into this Agreement, each
Purchaser hereby represents and warrants to the Company, with respect to itself
and not jointly, as follows:

     6.1 Purchaser's Investment Representations. Such Purchaser (i) is acquiring
         --------------------------------------
the Restricted Securities purchased hereunder or acquired pursuant hereto for
its own account with the present intention of holding such securities for
purposes of investment, (ii) has no intention of selling such securities in a
public distribution in violation of the federal securities laws or any
applicable state securities laws and (iii) is an "accredited investor" as
defined in the Securities Act; provided that nothing contained herein shall
prevent such Purchaser and subsequent holders of Restricted Securities from
transferring such securities in compliance with

                                      -5-
<PAGE>

the provisions of Article IV hereof. Each certificate for Restricted Securities
                  ----------
shall be imprinted with a customary securities legend in a form provided by the
Company's counsel.

     6.2 Authorization; No Breach. The execution, delivery and performance of
         ------------------------
this Agreement and all other agreements contemplated hereby to which such
Purchaser is a party have been duly authorized by such Purchaser. This Agreement
and all other agreements contemplated hereby to which a Purchaser is a party
each constitutes a valid and binding obligation of such Purchaser, enforceable
in accordance with its terms. The execution and delivery by such Purchaser of
this Agreement, the Stockholders Agreement and all other agreements contemplated
hereby to which such Purchaser is a party, and compliance with the respective
terms hereof and thereof by such Purchaser do not and will not (i) conflict with
or result in a breach of the terms, conditions or provisions of, (ii) constitute
a default under, (iii) result in the creation of any lien, security interest,
charge or encumbrance upon such Purchaser's capital stock or assets pursuant to,
(iv) give any third party the right to modify, terminate or accelerate any
obligation under, (v) result in a violation of, or (vi) require any
authorization, consent, approval, exemption or other action by or notice to any
court or administrative or governmental body pursuant to, the charter or
organizational documents of such Purchaser, if applicable, or any law, statute,
rule or regulation to which such Purchaser is subject, or any agreement,
instrument, order, judgment or decree to which such Purchaser is a party or by
which it is bound.

                                  ARTICLE VII
                                  DEFINITIONS
                                  -----------

     For the purposes of this Agreement, the following terms have the meanings
set forth below:

     "Affiliate" of any particular person or entity means any other person or
entity controlling, controlled by or under common control with such particular
person or entity.

     "Class A Preferred" has the meaning set forth in the Recitals to this
Agreement.

     "Certificate of Incorporation" means the Company's amended and restated
Certificate of Incorporation filed with the Secretary of State of the State of
Delaware on August 12, 1999.

     "Closing" has the meaning set forth in Section 1.2(c).
                                            --------------

     "Common" has the meaning set forth in Recitals to this Agreement.

     "Common Stock" means collectively, the Common and any other class of the
Company's common stock, $.01 par value per share.

                                      -6-
<PAGE>

     "Indebtedness" means all indebtedness for borrowed money (including
purchase money obligations), all indebtedness under revolving credit
arrangements, all capitalized lease obligations and all guarantees of any of the
foregoing.

     "Investor Common" means (i) the Common Stock issued hereunder and (ii) any
Common Stock issued or issuable with respect to the Common Stock referred to in
clause (i) above by way of stock dividends or stock splits or in connection with
a combination of shares, recapitalization, merger, consolidation or other
reorganization. As to any particular shares of Investor Common, such shares
shall cease to be Investor Common when they have been (a) effectively registered
under the Securities Act and disposed of in accordance with the registration
statement covering, them or (b) distributed to the public through a broker,
dealer or market maker pursuant to Rule 144 under the Securities Act (or any
similar rule then in force).

     "Investor Preferred" means (i) the Class A Preferred issued hereunder and
(ii) any Class A Preferred issued or issuable with respect to the Class A
Preferred referred to in clause (i) above by way of stock dividends or stock
splits or in connection with a combination of shares, recapitalization, merger,
consolidation or other reorganization. As to any particular shares of Investor
Preferred, such shares shall cease to be Investor Preferred when they have been
(a) effectively registered under the Securities Act and disposed of in
accordance with the registration statement covering them, (b) distributed to the
public through a broker, dealer or market maker pursuant to Rule 144 under the
Securities Act (or any similar rule then in force) or (c) redeemed by the
Company.

     "Investor Stock" means the Investor Preferred and the Investor Common.

     "Person" means an individual, a partnership, a limited liability company, a
corporation, an association, a joint stock company, a trust, a joint venture, an
unincorporated organization and a governmental entity or any department, agency
or political subdivision thereof.

     "Restricted Securities" means (i) the Stock issued hereunder and (ii) any
securities issued with respect to the securities referred to in clause (i) above
by way of a stock dividend or stock split or in connection with a combination of
shares, recapitalization, merger, consolidation or other reorganization. As to
any particular Restricted Securities, such securities shall cease to be
Restricted Securities when they have (A) been effectively registered under the
Securities Act and disposed of in accordance with the registration statement
covering them, (B) become eligible for sale pursuant to Rule 144(k) (or any
similar provision then in force) under the Securities Act or (C) been otherwise
transferred and new certificates for them not bearing a customary Securities Act
legend have been delivered by the Company in accordance with Section 4.1(b).
                                                             --------------
Whenever any particular securities cease to be Restricted Securities, the holder
thereof shall be entitled to receive from the Company, without expense, new
securities of like tenor not bearing a customary Securities Act legend.

     "Securities Act" means the Securities Act of 1933, as amended, or any
similar federal law then in force.

                                      -7-
<PAGE>

     "Securities Exchange Act" means the Securities Exchange Act of 1934, as
amended, or any similar federal law then in force.

     "Securities and Exchange Commission" includes any governmental body or
agency succeeding to the functions thereof.

     "Stock" has the meaning set forth in Section 1.1 of this Agreement.
                                          -----------

     "Subsidiary" means any corporation of which the securities having a
majority of the ordinary voting power in electing the board of directors or
otherwise are, at the time as of which any determination is being made, owned by
the Company either directly or through one or more Subsidiaries.

     "Thayer Holdings" means Thayer ITECH Holdings, L.L.C.

                                 ARTICLE VIII
                                 MISCELLANEOUS
                                 -------------

     8.1 Expenses. The Company agrees to pay, and hold Thayer Holdings harmless
         --------
against liability for the payment of, (i) the fees and expenses of Thayer
Holdings' counsel arising in connection with the negotiation and execution of
this Agreement and the consummation of the transactions contemplated by this
Agreement, (ii) the fees and expenses incurred with respect to any amendments or
waivers (whether or not the same become effective) under or in respect of this
Agreement and the Certificate of Incorporation, (iii) stamp and other taxes
which may be payable in respect of the execution and delivery of this Agreement
or the issuance, delivery or acquisition of any shares of Stock purchased
hereunder or in accordance with Section 1.3 hereof, and (iv) the fees and
expenses incurred with respect to the interpretation or enforcement of the
rights of Thayer Holdings granted under this Agreement and the other agreements
contemplated hereby and the Certificate of Incorporation and the Company's
bylaws.

     8.2 Remedies. Each holder of Investor Stock shall have all rights and
         --------
remedies set forth in this Agreement and the Certificate of Incorporation and
all rights and remedies which such holders have been granted at any time under
any other agreement or contract and all of the rights which such holders have
under any law. Any Person having any rights under any provision of this
Agreement shall be entitled to enforce such rights specifically (without posting
a bond or other security), to recover damages by reason of any breach of any
provision of this Agreement and to exercise all other rights granted by law.

     8.3 Consent to Amendments. Except as otherwise expressly provided herein,
         ---------------------
the provisions of this Agreement may be amended and the Company may take any
action herein prohibited, or omit to perform any act herein required to be
performed by it, only if the Company has obtained the written consent of the
holders of a majority of the outstanding shares of Investor Common. No other
course of dealing between the Company and the holder of any Stock or any delay
in exercising any rights hereunder or under the Certificate of Incorporation

                                      -8-
<PAGE>

shall operate as a waiver of any rights of any such holders. For purposes of
this Agreement, shares of Stock held by the Company or any Subsidiaries shall
not be deemed to be outstanding.

     8.4 Survival of Representation and Warranties. All representations and
         -----------------------------------------
warranties contained herein or made in writing by any party in connection
herewith shall survive the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby, regardless of any
investigation made by any Purchasers or on their behalf

     8.5 Successors and Assigns. Except as otherwise expressly provided herein,
         ----------------------
all covenants and agreements contained in this Agreement by or on behalf of any
of the parties hereto shall bind and inure to the benefit of the respective
successors and permitted assigns of the parties hereto whether so expressed or
not. In addition, and whether or not any express assignment has been made, the
provisions of this Agreement which are for the Purchaser's benefit as a
purchaser or holder of Stock are also for the benefit of, and enforceable by,
any permitted subsequent holder of such Stock. The rights and obligations of the
Thayer Holdings under this Agreement and the agreements contemplated hereby may
be assigned by the Thayer Holdings at any time, in whole or in part, to any
investment fund managed by TC Management Partners, L.L.C. or any other Affiliate
of Thayer Holdings, or any successor thereto.

     8.6 Severability. Whenever possible, each provision of this Agreement shall
         ------------
be interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Agreement is held to be prohibited by or invalid
under applicable law, such provision shall be ineffective only to the extent of
such prohibition or invalidity, without invalidating, the remainder of this
Agreement.

     8.7 Counterparts. This Agreement may be executed simultaneously in two or
         ------------
more counterparts, any one of which need not contain the signatures of more than
one party, but all such counterparts taken together shall constitute one and the
same Agreement.

     8.8 Descriptive Headings; Interpretation. The descriptive headings of this
         ------------------------------------
Agreement are inserted for convenience only and do not constitute a Section of
this Agreement. The use of the word "including" in this Agreement shall be by
way of example rather than by limitation.

     8.9 Governing Law. This Agreement and the exhibits and schedules hereto
         -------------
shall be governed by and construed in accordance with the internal laws of the
State of Delaware, without giving effect to any choice of law or conflict of law
provision or rule (whether of the State of Delaware or any other jurisdiction)
that would cause the application of the laws of any jurisdiction other than the
State of Delaware.

                                      -9-
<PAGE>

     8.10 Notices. All notices, demands or other communications to be given or
          -------
delivered under or by reason of the provisions of this Agreement shall be in
writing and shall be deemed to have been given when delivered personally to the
recipient by reputable express service (charges prepaid), 24 hours after being
sent by overnight courier service (charges prepaid), 48 hours after being
deposited to the recipient by United States mail, first class, postage prepaid,
or sent by facsimile. Such notices, demands and other communications shall be
sent to the Purchasers and to the Company at the address indicated below:

                  If to the Company:
                  -----------------

                    Iconixx Corporation
                    8300 Boone Boulevard
                    Suite 250
                    Vienna, Virginia 22182
                    Attention:    Jason Levine
                                  Graham Perkins
                    Tel No:  (703) 790-9276
                    Fax No:  (703) 790-9033

                  If to the Purchasers:
                  --------------------

                    To each Purchaser at the address set forth in the Schedule
                                                                      --------
                    of Purchasers attached hereto
                    -------------

                  with a copy to:

                    Hogan & Hartson, LLP
                    Thirteenth Street, N.W.
                    Washington, D.C.  20004
                    Attention:    Christopher J. Hagan
                    Tel No.: (202) 637-5600
                    Fax No.: (202) 637-5910

or to such other address or to the attention of such other person as the
recipient party has specified by prior written notice to the sending party.

     8.11 Entire Agreement. Except as otherwise expressly set forth herein, this
          ----------------
document embodies the complete agreement and understanding among the parties
hereto with respect to the subject matter hereof and supersedes and preempts any
prior understandings, agreements or representations by or among the parties,
written or oral, which may have related to the subject matter hereof in any way.

                      [THIS SPACE INTENTIONALLY LEFT BLANK]

                                     -10-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the
date first written above.

                                       ICONIXX CORPORATION

                                       By:      /s/ Graham Perkins
                                              ----------------------------------
                                              Name: Graham Perkins
                                              Title: Vice President/CFO

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:    Thayer Equity Investors, IV, L.P.
                                       Its:   Managing Member
                                       By:    TC Equity Partners, L.L.C.
                                       Its:   General Partner

                                       By:      /s/ Robert Michalik
                                              ----------------------------------
                                              Name:     Robert Michalik
                                              Title:    Vice President

                                       TC ITECH, L.L.C.

                                       By:      /s/ Robert Michalik
                                              ----------------------------------
                                              Name: Robert Michalik
                                              Title:   President

                                       [OTHER PURCHASERS]

                                     -11-
<PAGE>

                             SCHEDULE OF PURCHASERS

<TABLE>
<CAPTION>
                                                                         Number of Shares
                                                 Number of Shares           of Class A               Aggregate
                                                   of Common at            Preferred at           Investment ($)
       Name and Address of Purchaser                  Closing                 Closing               at Closing
--------------------------------------------    --------------------    --------------------    --------------------
<S>                                             <C>                     <C>                     <C>
Thayer Equity Investors IV, L.P.                3,000,000                     16,100                 20,000,000
c/o Thayer Capital Partners
1455 Pennsylvania Avenue, NW, Suite 350
Washington, D.C. 20004
Attention:        Robert Michalik

Tel No:           (202) 371-0150
Fax No:           (202) 371-0391

                                                --------------------    --------------------    --------------------
                  TOTAL                         3,000,000                     16,100                $20,000,000
                                                ====================    ====================    ====================
</TABLE>

                                     -12-
<PAGE>

                               JOINDER AGREEMENT
                         TO EQUITY PURCHASE AGREEMENT
                         ----------------------------

     This Joinder Agreement (this "Joinder") is made as of the date written
below by the undersigned (the "Joining Party") and certain parties to the Equity
Purchase Agreement, dated as of March 22, 2000 (the "Equity Purchase
Agreement"), by and among Iconixx Corporation, a Delaware corporation (the
"Company"), Thayer ITECH Holdings, L.L.C., a Delaware limited liability company
("Thayer Holdings") and TC ITECH, L.L.C. a Delaware limited liability company
("TC ITECH"). Capitalized terms used but not defined herein shall have the
meanings given such terms in the Equity Purchase Agreement.

     Pursuant to the Equity Purchase Agreement, the Company has sold to Thayer
Holdings an aggregate of 3,000,000 shares of Common Stock, par value $0.01 per
share, of the Company ("Common Stock") at a price of $1.30 per share and an
aggregate of 16,100 shares of Convertible Class A Preferred Stock, par value
$0.01 per share, of the Company ("Preferred Stock") at a price of $1,000 per
share. The Joining Party, as a stockholder of the Company, is entitled to
purchase from the Company up to 86,250 shares of Common Stock and up to 462.875
shares of Preferred Stock.

     By executing this Joinder, the Joining Party agrees to purchase from the
Company 86,250 shares of Common Stock at a price of $1.30 per share and 462.875
shares of Preferred Stock at a price of $1,000 per share, for an aggregate
purchase price of $575,000, according to the terms and subject to the conditions
set forth in the Equity Purchase Agreement.

     Accordingly, the Joining Party hereby acknowledges, agrees and confirms
that, by its execution of this Joinder, the Joining Party will be deemed to be a
party to the Equity Purchase and shall have all of the rights and obligations of
a "Purchaser" thereunder as if he or she had executed the Equity Purchase
Agreement. The Joining Party hereby ratifies, as of the date hereof, and agrees
to be bound by, all of the terms, provisions and conditions contained in the
Equity Purchase Agreement.

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<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  April 17, 2000

                                 THE JOINING PARTY:
                                 -----------------

                                 FBR TECHNOLOGY VENTURE PARTNERS, L.L.C.

                                 By:     /s/ Gene Riechers
                                         ---------------------------------------
                                 Name:   Gene Riechers
                                 Title:  Managing Director

                                 APPROVED BY:
                                 -----------

                                 ICONIXX CORPORATION

                                 By:     /s/ Jason H. Levine
                                         ---------------------------------------
                                 Name:   Jason H. Levine
                                 Title:  General Counsel

                                 THAYER ITECH HOLDINGS, L.L.C.

                                 By:     Thayer Equity Investors IV, L.P.
                                 Its:    Managing Member

                                         By:     TC Equity Partners IV, L.L.C.
                                         Its:    General Partner

                                                 By:     /s/ Robert E. Michalik
                                                         -----------------------
                                                 Name:   Robert E. Michalik
                                                 Title:  Vice President<PAGE>

                                                                    Exhibit 10.6

                             STOCKHOLDERS AGREEMENT

                                  By and Among

                          Empyrean Group Holdings, Inc.
                   (formerly, Business Solutions Group, Inc.),

                         Thayer ITech Holdings, L.L.C.,

                                       and

                            The Other Stockholders of
                          Empyrean Group Holdings, Inc.

                           Dated as of August 12, 1999

                                      -i-
<PAGE>

                               TABLE OF CONTENTS

                                                                        Page

ARTICLE I   DEFINITIONS..................................................2
ARTICLE II  GENERAL TRANSFERABILITY RESTRICTIONS.........................3
ARTICLE III   RIGHTS OF FIRST REFUSAL....................................4
      3.1 Notice.........................................................4
      3.2 Company Right..................................................4
      3.3 Thayer Right...................................................4
      3.4 Consummation...................................................4
      3.5 Selling Stockholder Right......................................5
ARTICLE IV   TAG ALONG RIGHTS............................................5
      4.1 Notice.........................................................5
      4.2 Stockholders Right.............................................5
      4.3 Consummation...................................................6
      4.4 Securities Laws................................................7
ARTICLE V   DRAG ALONG RIGHTS............................................7
      5.1 Drag Along Sale................................................7
      5.2 Drag Notice....................................................7
      5.3 Form of Consideration..........................................7
      5.4 Consummation...................................................8
ARTICLE VI   PUBLIC OFFERING.............................................8
ARTICLE VII   BOARD OF DIRECTORS.........................................9
      7.1 Composition of the Board.......................................9
      7.2 Removal........................................................9
      7.3 Vacancy........................................................9
      7.4 Quorum.........................................................9
      7.5 Voting.........................................................9
      7.6 Expenses.......................................................10
      7.7 Representations................................................10
      7.8 Conflict.......................................................10
ARTICLE VIII   CONFIDENTIALITY...........................................10
ARTICLE X  TERMINATION; ADDITIONAL PARTIES...............................10
      10.1 Termination...................................................10
      10.2 Additional Parties............................................11
ARTICLE XI   MISCELLANEOUS...............................................11
      11.1 Legend........................................................11
      11.2 No Waiver of Rights...........................................11
      11.3 Amendment.....................................................12
      11.4 Entire Agreement; Successors; Third Parties...................12
      11.5 No Assignment.................................................12
      11.6 Notices.......................................................12
      11.7 Captions......................................................13
      11.8 Counterparts..................................................13

                                      -i-
<PAGE>

      11.9 Governing Law and Venue.......................................13
      11.10 Severability.................................................13
      11.11 Transfers; Transfers in Violation of Agreement...............13
      11.12 Specific Performance.........................................13
      11.13 Further Assurances...........................................14
      11.14 Publicity....................................................14

                                     -ii-
<PAGE>

                             STOCKHOLDERS AGREEMENT

     This STOCKHOLDERS AGREEMENT (this "Agreement") is made and entered into as
of August 12, 1999, by and among Empyrean Group Holdings, Inc. (formerly,
Business Solutions Group, Inc.), a Delaware corporation (the "Company"); Thayer
ITech Holdings, L.L.C., a Delaware limited liability company ("Thayer"); the
Stockholders of the Company listed on Exhibit A hereto (the "Stockholders"); and
                                      ---------
each other holder of Equity Securities who hereafter executes a Joinder
Agreement agreeing to be bound by the terms hereof. Certain capitalized terms
used herein are defined in Article I.
                           ---------

                                    Recitals
                                    --------

     A. Pursuant to a Recapitalization Agreement (the "Recapitalization
Agreement"), dated as of August 11, 1999, by and among Business Solutions Group,
Inc. (predecessor to the Company), Thayer, BSG Holdings, Inc. ("Parent"), and
the shareholders of BSG Holdings, Thayer, the Company, and Parent each own
shares of the Company's common stock (the "Common Stock") and shares of the
Company's preferred stock (the "Preferred Stock"). The Common Stock and the
Preferred Stock shall have voting and other rights and preferences as set forth
in the Amended and Restated Certificate of Incorporation dated August 12, 1999,
as amended from time to time (the "Amended and Restated Certificate of
Incorporation").

     B. Pursuant to a Merger Agreement, to be entered into in August 1999, by
and among the Company, Empyrean Group, Inc. and FBR Technology Venture Partners,
LP. ("FBR"), FBR will receive shares of the Company's Common Stock and Preferred
Stock.

     C. In connection with such transactions, the Company and the Stockholders
have determined that it is in their respective best interests to enter into, and
perform under, this Agreement.

     D. Any other Persons who purchase shares of the Company's capital stock
shall become parties to this Agreement with respect to all of such capital stock
by executing a Joinder Agreement.

     E. The Company and the Stockholders desire to enter into this Agreement for
the purposes, among others, of (i) assuring continuity in the ownership of the
Company, (ii) limiting the manner and terms by which the Stockholders' capital
stock of the Company may be transferred.
<PAGE>

                                    Agreement
                                    ---------

     In consideration of the foregoing and the covenants set forth herein and
intending to be legally bound hereby, the parties hereto agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

     For purposes of this Agreement, in addition to terms defined elsewhere
herein, the following terms when used herein shall have the following meanings:

     1.1 "Affiliate," with respect to any Person, shall mean (i) any other
Person that directly or indirectly, controls, is controlled by, or is under
common control with, such Person or (ii) a general or limited partner of such
Person.

     1.2 "Board" shall mean the Board of Directors of the Company.

     1.3 "Confidential Information" means (i) the terms and provisions of this
Agreement and the Transactions and (ii) all confidential information (for
purposes of this Agreement, confidential information shall refer to all
information which is the subject of reasonable efforts by the Company to
maintain its non-public character or to otherwise prevent such information from
becoming widely known) and trade secrets of the Company or its Affiliates
including, without limitation, any of the same comprising the identity, lists or
descriptions of any customers, referral sources or organizations; financial
statements, cost reports or other financial information; contract proposals, or
bidding information; business plans and training and operations methods and
manuals; personnel records; fee structure; and management systems, policies or
procedures, including related forms and manuals. Confidential Information shall
not include any information (a) which is disclosed pursuant to subpoena or other
legal process, (b) which has been publicly disclosed, or (c) which is
subsequently disclosed to any third party not in breach of a confidentiality
agreement.

     1.4 "Equity Securities" shall mean (i) any securities of the Company having
voting rights with respect to the election of the Board not contingent upon
default, including, but not limited to, shares of the Common Stock, (ii) any
securities evidencing any equity ownership interest in the Company including,
but not limited to, the Preferred Stock, and (iii) any securities convertible
into or exercisable or exchangeable for any of the foregoing securities.

     1.5 "Family Members" with respect to an individual, shall mean such
individual's spouse, parents, siblings and children.

     1.6 "IPO Event" shall mean an underwritten public offering, pursuant to an
effective registration statement under the Securities Act, that is underwritten
by one or more nationally-recognized investment banking firms and results in the
Company receiving, prior to redemption of any Preferred Stock, not less than
$30,000,000 in aggregate cash proceeds from such offering.

                                      -2-
<PAGE>

     1.7 "Liquidation Value" shall have the meaning assigned to such term in the
Amended and Restated Certificate of Incorporation.

     1.8 "Permitted Transfer" shall mean a Transfer of shares of Common Stock by
a Stockholder to (i) one or more Family Members of such Stockholder, or if such
Stockholder is an individual, to such Stockholder's estate; or (ii) a trust
solely for the benefit of one or more Family Members of such Stockholder;
provided that, prior to any such Transfer, each transferee shall execute a
Joinder Agreement. Any transferee receiving Common Stock pursuant to a Permitted
Transfer shall be included within the definition of "Stockholder" for purposes
of this Agreement.

     1.9 "Person" means any individual, corporation, partnership, joint venture,
association, joint-stock company, limited liability company, trust,
unincorporated organization or government body.

     1.10 "Pro Rata Share" shall mean the holder's pro rata share of the
outstanding Common Stock which shall be a fraction calculated by dividing (i)
the number of shares of Common Stock held by the holder as of the applicable
date plus the number of shares of Common Stock issuable upon conversion,
exercise or exchange of all other outstanding Equity Securities held by the
holder as of the applicable date, by (ii) the total number of shares of Common
Stock outstanding as of such date plus the total number of shares of Common
Stock issuable upon conversion, exercise or exchange of all other outstanding
Equity Securities as of such date.

     1.11 "Securities Act" shall mean the Securities Act of 1933, as amended,
and all rules and regulations promulgated thereunder.

     1.12 "Stockholders" shall mean collectively the Persons listed on Exhibit A
hereto and each other Person, other than Thayer or its Affiliates, that becomes
a holder of Equity Securities and agrees in writing to be bound by and comply
with the terms of this Agreement.

     1.13 "Transfer" shall mean any actual or proposed disposition of all or a
portion of an interest (legal or equitable) by any means, direct or indirect,
absolute or conditional, voluntary or involuntary, including, but not limited
to, by sale, assignment, put, transfer, pledge, hypothecation, mortgage or other
encumbrance, operation of law, distribution, settlement, exchange, waiver,
abandonment, gift, alienation, bequest or disposal.

                                   ARTICLE II
                      GENERAL TRANSFERABILITY RESTRICTIONS

         Except for Permitted Transfers and other Transfers in compliance with
Articles II, III, IV and V of this Agreement, no Stockholder shall Transfer or
cause or permit to be Transferred any Equity Securities owned or controlled by
such Stockholder, and any purported Transfer in violation hereof shall be null
and void. Notwithstanding the foregoing, all repurchases or purchases of any
Equity Securities issued pursuant to any management agreements with

                                      -3-
<PAGE>

employees of the Company (the "Management") shall be excluded from the
provisions of this Agreement.

                                   ARTICLE III
                             RIGHTS OF FIRST REFUSAL

     Before any Equity Securities owned or controlled by a Stockholder (a
"Selling Stockholder") may be Transferred (other than in a Permitted Transfer or
a Transfer pursuant to Article IV or V hereof) prior to the effective date of an
                       ----------    -
IPO Event, Thayer and the Company shall be offered the following rights with
respect to such Equity Securities:

     3.1 Notice. The Selling Stockholder shall first deliver a written notice (a
         ------
"Stockholder Notice") to the Company and Thayer stating (i) that the Selling
Stockholder desires to Transfer such Equity Securities, (ii) the number and type
of Equity Securities proposed to be Transferred and (iii) the price and other
material terms of the proposed Transfer. The Stockholder Notice shall be
accompanied by a certificate of the Selling Stockholder certifying that it has
received from a third party a bona fide offer to acquire such Equity Securities
at such price and on such terms as are set forth in the Stockholder Notice and
shall identify such third party.

     3.2 Company Right. Within twenty (20) days after receipt of a Stockholder
         -------------
Notice (the "Company Period"), the Company may elect, by delivering to the
Selling Stockholder and to Thayer a written notice (a "Company Notice") of its
election, to purchase all or any part of the Equity Securities to which the
Stockholder Notice refers, on the same terms and conditions specified in such
Stockholder Notice (or, if such offer is not all in cash, on economically
equivalent terms and conditions as determined in good faith by the Company and
specified in the Company Notice) and indicating the number of shares the Company
desires to repurchase. In the event that the Company does not elect to purchase
any of such Equity Securities, the Company shall send a notice to such effect to
the Selling Stockholder and to Thayer prior to the end of the Company Period.

     3.3 Thayer Right. In the event that the Company does not elect to purchase
         ------------
during the Company Period all of the Equity Securities to which the Stockholder
Notice refers, then Thayer may elect, by delivering to the Selling Stockholder a
written notice (a "Thayer Notice"), within thirty (30) days after Thayer's
receipt of the Stockholder Notice (the "Thayer Period"), of its election to
acquire, on the same terms and conditions specified in the Stockholder Notice
(or, if such offer is not all in cash, on economically equivalent terms and
conditions as determined in good faith by Thayer and specified in the Thayer
Notice), all of such Equity Securities that the Company has not elected to
purchase.

     3.4 Consummation. In the event that the Company and/or Thayer elects to
         ------------
acquire Equity Securities pursuant to this Article III, the Company, Thayer and
                                           -----------
the Selling Stockholder shall consummate the sale and purchase of such Equity
Securities within sixty (60) days after the date that the Company and Thayer
have received the Stockholder Notice.

                                      -4-
<PAGE>

     3.5 Selling Stockholder Right. To the extent the Company and Thayer do not
         -------------------------
exercise their respective rights under this Article III within the specified
                                            -----------
time periods, the Selling Stockholder may Transfer the Equity Securities
specified in its Stockholder Notice (and not purchased by the Company or Thayer)
to the third party specified in such Stockholder Notice at the price and on the
terms specified in such notice, provided that (i) such Transfer is consummated
within one hundred twenty (120) days of the date of delivery of such Stockholder
Notice and (ii) prior to the Transfer, such third party agrees in writing to
execute a Joinder Agreement.

                                   ARTICLE IV
                                TAG ALONG RIGHTS

     Until the earlier of (a) the effective date of an IPO Event or (b) the date
when Thayer's Pro Rata Share (together with any Affiliates of Thayer) is less
than fifty-one percent (51%), Thayer shall not engage in a transaction
(including a merger, consolidation or similar business combination) that
involves the Transfer by Thayer (together with any Affiliates of Thayer) to a
third party of Common Stock representing greater than fifty percent (50%) of the
outstanding Common Stock held by Thayer (other than a "Drag Along Sale" as
defined in Article V below and other than a Transfer to one or more Affiliates
           ---------
of Thayer and/or Family Members of such Affiliates) without first offering the
other Stockholders the right to participate in such Transfer in the following
manner:

     4.1 Notice. Thayer shall first deliver a written notice (a "Transfer
         ------
Notice") to the Stockholders stating (i) Thayer's desire to Transfer shares of
Common Stock to a third party, (ii) the number of shares of Common Stock
proposed to be Transferred and (iii) the price and the other general terms of
the proposed Transfer, including any escrow of funds from such sale. Such notice
may be provided before Thayer has identified a purchaser or purchasers for such
Equity Securities; provided, however, that Thayer shall promptly inform the
Stockholders in writing of the purchaser's or purchasers' identity once it is
known to Thayer.

     4.2 Stockholders Right. Each Stockholder may elect, by delivering to Thayer
         ------------------
a written notice (a "Tag Along Notice") of its election within fifteen (15) days
after receipt of the Transfer Notice (the "Tag Along Period"), to participate in
Thayer's Transfer of Common Stock on the same terms and conditions specified in
the Transfer Notice. The Tag Along Notice shall specify the maximum number of
Common Stock shares that the Stockholder (a "Tag Along Stockholder") may elect
to Transfer which number shall not exceed the product (rounded down to the
nearest whole number) of (i) a fraction, the numerator of which is the number of
Common Stock shares proposed to be Transferred by Thayer, and the denominator of
which is the aggregate number of Common Stock shares owned by Thayer, multiplied
by (ii) the number of shares of Common Stock owned by the Stockholder plus the
number of shares of Equity Securities then convertible into Common Stock or
which will become convertible into Common Stock as a result of the transaction
contemplated by the Transfer Notice. Thayer shall use its commercially
reasonable best efforts to interest the third party in purchasing all the shares
of Common Stock specified by Tag Along Stockholders in the Tag Along Notices, in
addition to

                                      -5-
<PAGE>

the Common Stock that the third party may already have agreed to purchase from
Thayer. If the third party refuses to purchase all of such additional shares of
Common Stock, then Thayer may sell Common Stock to such third party only if
Thayer and each Tag Along Stockholder are entitled to sell to such third party
an amount of Common Stock equal to the product (rounded down to the nearest
whole number) obtained by multiplying (x) the aggregate number of Common Stock
shares such third party is willing to acquire by (y) a fraction, the numerator
of which is the number of Common Stock shares owned by Thayer or the Tag Along
Stockholder plus the number of shares of Equity Securities then convertible into
Common Stock or which will become convertible into Common Stock as a result of
the transaction contemplated by the Transfer Notice, as the case may be, and the
denominator of which is the aggregate number of Common Stock shares owned by
Thayer and all the Tag Along Stockholders.

     4.3 Consummation.
         ------------

         (a) At least ten (10) days prior to the consummation of a Transfer by
Thayer described in a Transfer Notice and not before the earlier of (x) the end
of the Tag Along Period and (y) the receipt by Thayer of a Tag Along Notice from
each Stockholder, Thayer shall provide written notice (a "Consummation Notice")
to each Tag Along Stockholder stating (i) the identity of the third party
transferee, (ii) the number of shares of Common Stock that such Tag Along
Stockholder will be entitled to sell to such third party pursuant to this
Article IV, and (iii) the date the Transfer will be consummated. At least five
----------
(5) days prior to the date of such consummation, each Tag Along Stockholder
shall deliver to Thayer for Transfer to the third party one or more
certificates, properly endorsed for Transfer, which represent the number of
shares of Common Stock such Tag Along Stockholder is entitled to sell as
provided in the Consummation Notice. The certificate(s) delivered to Thayer by
each Tag Along Stockholder shall be Transferred to the third party identified in
the Consummation Notice, as part of the consummation of the Transfer of Common
Stock pursuant to the terms and conditions specified in the Transfer Notice and
the Consummation Notice. Upon receipt of the proceeds of the Transfer, Thayer
shall promptly remit to each Tag Along Stockholder that portion of such proceeds
to which such Tag Along Stockholder is entitled by reason of such Stockholder's
participation in such Transfer together with any stock certificates for any
shares not sold in the Transfer.

         (b) In connection with a Transfer pursuant to this Article IV, each Tag
Along Stockholder shall be required to make representations and warranties
regarding the Common Stock that such Stockholder proposes to Transfer,
including, but not limited to, such Stockholder's ownership of and authority to
Transfer such Common Stock, the absence of any liens or other encumbrances on
such stock, and the compliance of such Transfer with the federal and state
securities laws and all other applicable laws and regulations. In addition, each
Tag Along Stockholder who is either a director or an executive officer of the
Company or the holder of more than five percent (5%) of the outstanding Common
Stock (other than John R. McDougall, D. Marshall Nelson or Philip H. Duong
unless such person is then serving as a director of the Company or the Company's
Chief Executive Officer or Chief Operating Officer) shall also be required to
provide customary representations and warranties regarding the Company.

                                      -6-
<PAGE>

     4.4 Securities Laws. Notwithstanding anything to the contrary in this
         ---------------
Article IV, Thayer shall have no obligation to permit a Stockholder, and no
----------
Stockholder shall have a right, to participate as a Tag Along Stockholder in a
Thayer Transfer of Common Stock in the event that such Stockholder's Transfer
(i) would not be exempt from all registration requirements under federal and
state securities laws or (ii) would violate, or cause Thayer's Transfer to
violate, any applicable federal or state laws.

                                   ARTICLE V
                               DRAG ALONG RIGHTS

     5.1 Drag Along Sale. In the event that, prior to the effective date of an
         ---------------
IPO Event, Thayer, in its sole discretion, determines to accept an offer from a
third party that is not an Affiliate of Thayer to purchase all of the Equity
Securities then held by Thayer and the Stockholders, then each Stockholder shall
be required to sell all the shares of Common Stock and Preferred Stock (together
with any other Equity Securities) held by such Stockholder pursuant to such
offer (the "Drag Along Sale"). If the Drag Along Sale is structured as a (i)
merger or consolidation, each holder of Equity Securities shall waive any
dissenters' rights, appraisal rights or similar rights in connection with such
merger or consolidation or (ii) sale of stock, each holder of Equity Securities
shall agree to sell all of its, her or his Equity Securities and rights to
acquire Equity Securities on the terms and conditions approved by the Board and
Thayer. Each seller of Equity Securities in such Drag Along Sale (i) shall be
subject to the same terms and conditions of sale and (ii) shall execute such
documents and take such actions as may be reasonably required by the Board and
Thayer.

     5.2 Drag Notice. Thayer shall provide each Stockholder with written notice
         -----------
(the "Drag Notice") of a Drag Along Sale at least fifteen (15) days prior to the
date of consummation of such sale (the "Drag Along Sale Date"). Each Drag Notice
shall set forth: (i) the identity of the third party transferee in the Drag
Along Sale, (ii) the price and the other general terms of the proposed Transfer
and (iii) the Drag Along Sale Date.

     5.3 Form of Consideration. The provisions of this Article V shall apply
         ---------------------                         ---------
regardless of the form of consideration received in the Drag Along Sale. Upon
the consummation of the Drag Along Sale, (i) each holder of Common Stock shall
receive the same form of consideration and the same amount of consideration per
share; (ii) if any holders of Common Stock are given an option as to the form
and amount of consideration to be received, each holder of Common Stock shall be
given the same option; (iii) unless waived by Thayer and the holders of a
majority of the then outstanding shares of Preferred Stock not owned by Thayer
or its Affiliates, each holder of Preferred Stock shall receive an amount (prior
to any amounts received by any holder of Common Stock with respect thereto) in
such Drag Along Sale equal to, and in any event no more than, the amount such
holder would be entitled to receive as the Liquidation Value of such holder's
shares of Preferred Stock; and (iv) any non-cash consideration received by a
class of Equity Securities pursuant to the terms of the Drag Along Sale shall be
allocated among the transferors of such class of Equity Securities pro rata
based upon each transferor's percentage ownership of such class of shares sold
in the Drag Along Sale.

                                      -7-
<PAGE>

     5.4 Consummation.
         ------------

         (a) At least five (5) days prior to the date of consummation of a Drag
Along Sale, each Stockholder shall deliver to Thayer for Transfer to the third
party one or more certificates, properly endorsed for Transfer, which represent
all of the shares of Equity Securities held by such Stockholder. The
certificate(s) delivered to Thayer by each Stockholder shall be Transferred to
the third party transferee identified in the Drag Notice, as part of the
consummation of the Drag Along Sale. Upon receipt of the proceeds of the Drag
Along Sale, Thayer shall promptly remit to each Stockholder that portion of such
proceeds to which such Stockholder is entitled by reason of such Stockholder's
participation in such sale.

         (b) In connection with a Drag Along Sale, each Stockholder shall be
required to make representations and warranties regarding the Equity Securities
that such Stockholder Transfers in such sale, including, but not limited to,
such Stockholder's ownership of and authority to Transfer such Equity
Securities, the absence of any liens or other encumbrances on such securities.
In addition, each Stockholder who is either a director or an executive officer
of the Company or the holder of more than five percent (5%) of the outstanding
Common Stock (other than John R. McDougall, D. Marshall Nelson or Philip H.
Duong unless such person is then serving as a director of the Company or the
Company's Chief Executive Officer or Chief Operating Officer) shall also be
required to provide customary representations and warranties regarding the
Company. Notwithstanding the foregoing, in the event that any portion of the
consideration in a Drag-Along Sale is subject to escrow or a future contingency,
each Stockholder's right to the proceeds of the Drag-Along Sale shall be
proportionally subject to such escrow and/or contingency and the future payments
due therefrom.

                                   ARTICLE VI
                                 PUBLIC OFFERING

         Other than the Preferred Stock whose rights and obligations upon the
occurrence of an IPO Event shall be determined exclusively by reference to the
Company's Amended and Restated Certificate of Incorporation, as amended, in the
event that the Board and the holders of a majority of the outstanding shares of
Common Stock approve proceeding with an IPO Event, Thayer and the Stockholders
shall take all reasonably necessary or desirable actions in connection with the
consummation of the IPO Event. If the IPO Event is an underwritten offering and
the managing underwriters advise the Company in writing that in their opinion
the capital structure of the Company shall adversely affect the marketability of
the offering, each Stockholder shall consent to and vote for a recapitalization,
reorganization and/or exchange of the capital of the Company into securities
that the managing underwriters, the Board and holders of a majority of the
outstanding shares of Common Stock find acceptable and shall take all necessary
or desirable actions in connection with the consummation of the
recapitalization, reorganization and/or exchange; provided, however, that (i)
the resulting securities reflect and are consistent with the relative rights and
preferences among the outstanding classes of securities set forth in the
Company's Amended and Restated Certificate of Incorporation, as amended and such
recapitalization, reorganization or exchange is otherwise fair and reasonable to
the Company and the holders of each class of the

                                      -8-
<PAGE>

Company's Equity Securities taking into account each of the relative
rights and preferences and (ii) the Company shall reimburse each
Stockholder for the reasonable expenses incurred by such Stockholder in
taking such actions. Each holder of Equity Securities shall not effect any
public sale or distribution (including sales pursuant to Rule 144) of
Equity Securities, or any securities convertible into or exchangeable or
exercisable for such securities, during the seven (7) days prior to and the
120-day period beginning on the effective date of an IPO Event, unless the
underwriters managing such IPO Event otherwise agree.

                                   ARTICLE VII
                               BOARD OF DIRECTORS

     7.1 Composition of the Board. Each Stockholder shall vote all of his or its
         ------------------------
shares of Common Stock and any other voting Equity Securities of the Company
over which such Stockholder has voting control and shall take all other
necessary or desirable actions within his or its control (whether in his or its
capacity as a Stockholder, director, member of a board committee or officer of
the Company or otherwise, and including, without limitation, attendance at
meetings in person or by proxy for purposes of obtaining a quorum and execution
of written resolutions in lieu of meetings), and the Company shall take all
necessary and desirable actions within its control (including, without
limitation, calling special Board and Stockholder meetings), so that (i) the
authorized number of directors on the Board shall be established at five (5)
directors, and (ii) the following persons shall be elected to the Board at each
election of directors: (A) one representative shall be the Company's Chief
Executive Officer; (B) one representative shall be designated by a vote of the
holders of the Common Stock held by Management; and (C) three (3)
representatives shall be designated on behalf of Thayer by Thayer Equity
Investors IV, L.P.

     7.2 Removal. The removal from the Board (with or without cause) of any
         -------
director shall be made only upon the written request of the Person or Persons
entitled to designate such director pursuant to Section 3.1 above, but only upon
                                                -----------
such written request and under no other circumstances

     7.3 Vacancy. In the event that any representative designated hereunder for
         -------
any reason ceases to serve as a member of the Board during his term of office,
the resulting vacancy on the Board shall be filled by a representative
designated by the Person or Persons entitled to designate such director pursuant
to Section 3.1 above.
   -----------

     7.4 Quorum. A majority of the Directors, including at least one of the two
         ------
(2) representatives not designated by Thayer, shall constitute a quorum. If no
quorum is present at a meeting of the Board of Directors, such meeting shall be
adjourned for a period of two (2) weeks, or such other period of time as shall
be agreed upon by all the Directors, and notice of the adjourned meeting shall
be provided to all Directors in accordance with the Company's Bylaws.

     7.5 Voting. The Board of Directors shall decide by majority vote any
         ------
election or question brought before the meeting, unless the election or question
is one upon which, under

                                      -9-
<PAGE>

an express provision of law, a greater vote is required, in which case such
express provision shall govern and control the decision of such election or
question.

     7.6 Expenses. The Company shall pay the reasonable out-of-pocket expenses
         --------
incurred by each director named hereunder in connection with attending the
meetings of the Board and any committee thereof.

     7.7 Representations. Each Stockholder represents that he, she or it has not
         ---------------
granted and is not a party to any proxy, voting trust or other agreement which
is inconsistent with or conflicts with the provisions of this Agreement, and no
holder of Equity Securities shall grant any proxy or become party to any voting
trust or other agreement which is inconsistent with or conflicts with the
provisions of this Agreement.

     7.8 Conflict. The Stockholders shall take such action as may be necessary
         --------
to amend any provision in the Company's Certificate of Incorporation or ByLaws
to in order to remedy any inconsistency between any provision of the Company's
Certificate of Incorporation or ByLaws with any provision of this Article VII.
                                                                  -----------

                                  ARTICLE VIII
                                 CONFIDENTIALITY

     Other than John R. McDougall, Philip H. Duong and D. Marshall Nelson whose
confidentiality obligations will be governed by the terms of their respective
employment agreements, each Investor who is an officer or employee of the
Company or its subsidiaries agrees to treat and hold in confidence and not
disclose all Confidential Information that such Investor may have obtained from
the Company or any Affiliate of the Company as a result of owning any of the
Company's Equity Securities or the performance of this Agreement so long as the
Investor is an officer or employee of the Company and for a period of two (2)
years thereafter; provided, however, that an Investor shall have the right to
utilize or disclose confidential information in connection with and in
furtherance of the Company's business or in connection with the Company's
capital raising and financial or other strategic planning. In the event that any
Investor is requested or required (by oral question or written request for
information or documents in any legal proceeding, interrogatory, subpoena, civil
investigative demand, or similar legal proceeding) to disclose any Confidential
Information, such Investor shall notify the Company promptly of the request or
requirement.

         [ARTICLE IX - RESERVED]

                                    ARTICLE X
                         TERMINATION; ADDITIONAL PARTIES

         10.1 Termination. All rights and obligations set forth in this
              -----------
Agreement (other than in Article VI), to the extent not previously terminated,
                         ----------
shall terminate upon the earlier of (i) the effective date of an IPO Event; (ii)
the written agreement of Thayer and the holders of at least fifty percent (50%)
of outstanding Common Stock held by the Stockholders other than

                                     -10-
<PAGE>

Thayer; or (iii) the closing of a Drag Along Sale. Article VI shall terminate
                                                   ----------
upon the earlier of (i) 180 days after the effective date of an IPO Event (other
than the Company's agreement to reimburse expenses described in clause (ii) of
Article VI) or (ii) the closing of a Drag-Along Sale.
----------

     10.2 Additional Parties. Without the prior written consent of Thayer, the
          ------------------
Company shall not issue or sell after the date hereof, any shares of Common
Stock or Preferred Stock to any individual or entity without such individual or
entity becoming a party to this Agreement by execution and delivery of a Joinder
to this Agreement in the form of Exhibit B attached hereto. Any such additional
                                 ---------
party shall become a Stockholder subject to and bound by all the terms and
conditions of this Agreement. All additional shares of capital stock issued by
the Company to such purchasers shall be deemed to be "Equity Securities" owned
by a Stockholder for purposes of this Agreement. The Company shall promptly add
to the List (as described in Section 11.6) the name and address of each new
                             ------------
party hereto.

                                   ARTICLE XI
                                  MISCELLANEOUS

     11.1 Legend. All certificates evidencing Equity Securities restricted by
          ------
this Agreement shall bear a legend indicating the existence of the restrictions
imposed hereby and a stop transfer order may be placed with respect to such
securities. The legend referred to in the preceding sentence shall be
substantially in the following form:

        THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE
        TRANSFER RESTRICTIONS AND OTHER TERMS OF A STOCKHOLDERS AGREEMENT
        DATED AS OF AUGUST 12, 1999, AMONG EMPYREAN GROUP HOLDINGS, INC.
        (FORMERLY, BUSINESS SOLUTIONS GROUP, INC.), AND CERTAIN
        STOCKHOLDERS THEREOF AND MAY NOT BE TRANSFERRED EXCEPT IN
        ACCORDANCE WITH SUCH AGREEMENT. A COPY OF SUCH AGREEMENT IS ON
        FILE AT THE PRINCIPAL OFFICE OF EMPYREAN GROUP HOLDINGS, INC. AND
        WILL BE FURNISHED UPON REQUEST TO THE HOLDER OF RECORD OF THE
        SECURITIES REPRESENTED BY THIS CERTIFICATE.

     11.2 No Waiver of Rights. No failure or delay on the part of any party in
          -------------------
the exercise of any power or right hereunder shall operate as a waiver thereof.
No single or partial exercise of any right or power hereunder shall operate as a
waiver of such right or power or of any other right or power. The waiver by any
party of a breach of any provision of this Agreement shall not operate or be
construed as a waiver of any other or subsequent breach hereunder. Except as
otherwise expressly provided herein, all rights and remedies existing under

                                     -11-
<PAGE>

this Agreement are cumulative with, and not exclusive of, any rights or remedies
otherwise available.

     11.3 Amendment. Except as otherwise expressly set forth in this Agreement,
          ---------
this Agreement may be amended or supplemented only by the written agreement of
the Company, Thayer and the holders of at least fifty percent (50%) of all
outstanding shares of Common Stock held by the Stockholders other than Thayer.

     11.4 Entire Agreement; Successors; Third Parties. This Agreement contains
          -------------------------------------------
the entire agreement among the parties with respect to the transactions
contemplated hereby and supersedes all prior arrangements or understandings with
respect thereto, written or oral. The terms and conditions of this Agreement
shall inure to the benefit of and be binding upon the parties hereto and their
respective successors, heirs, executors, administrators and permitted assigns.
Except as specifically set forth herein, nothing in this Agreement, expressed or
implied, is intended to confer upon any party, other than the parties hereto and
their respective successors and permitted assigns, any rights, remedies,
obligations or liabilities.

     11.5 No Assignment. No party hereto may assign any of its rights or
          -------------
obligations under this Agreement to any other person, except that Thayer may
assign part or all of its rights and obligations hereunder to one or more
Affiliates of Thayer and its successors and assigns.

     11.6 Notices. All notices or other communications which are required or
          -------
permitted hereunder shall be in writing and sufficient if delivered personally,
by facsimile or sent by overnight express or by registered or certified mail,
postage prepaid, addressed as follows:

          If to the Company to:

                   Empyrean Group Holdings, Inc.
                   8300 Boone Boulevard
                   Suite 250
                   Vienna, VA 22182
                   Attention:  Jason H. Levine
                   Facsimile:   (703) 790-9033
                   Telephone:  (703) 790-9276

          If to Thayer:

                   c/o Thayer Equity Investors IV, L.P.
                   1455 Pennsylvania Avenue, N.W.
                   Suite 350
                   Washington, D.C.  20004
                   Attention:                Daniel Raskas
                                             Robert Michalik
                   Facsimile:                (202) 371-0391

                                     -12-
<PAGE>

                   Telephone:                (202) 371-0150

         During the term of this Agreement, the Company shall maintain a current
list of all Stockholders (the "List"), including their names, addresses and
facsimile numbers, if any, for purposes of sending notices and other
communications pursuant to this Section 11.6. At the request of any party
                                ------------
hereto, the Company promptly shall provide a copy of the List to such party. All
notices to any of the Stockholders shall be sent to the addresses set forth on
the List (an initial copy of which is attached hereto as Exhibit A). All
                                                         ---------
deliveries of notice shall be deemed effective when received by the persons
entitled to such receipt or when delivery has been attempted but refused by such
person or persons.

     11.7 Captions. The captions contained in this Agreement are for reference
          --------
purposes only and shall not affect in any way the meaning or interpretation of
this Agreement.

     11.8 Counterparts. This Agreement may be executed in any number of
          ------------
counterparts, and each such counterpart shall be deemed to be an original
instrument, but all such counterparts together shall constitute but one
agreement.

     11.9 Governing Law and Venue. The validity, interpretation, construction
          -----------------------
and performance of this Agreement shall be governed by the laws of the State of
Delaware applicable to agreements made and entirely to be performed within such
jurisdiction. The party bringing any action under this Agreement shall only be
entitled to choose the federal or local courts in the Eastern District of the
Commonwealth of Virginia as the venue for such action, and each party consents
to the jurisdiction of the court chosen in such manner for such action.

     11.10 Severability. The provisions of this Agreement are severable, and the
           ------------
unenforceability of any provision of this Agreement shall not affect the
enforceability of the remainder of this Agreement. The parties acknowledge that
it is their intention that if any provision of this Agreement is determined by a
court to be invalid, illegal or unenforceable as drafted, that provision should
be construed in a manner designed to effectuate the purpose of that provision to
the greatest extent possible under applicable law.

     11.11 Transfers; Transfers in Violation of Agreement. Prior to Transferring
           ----------------------------------------------
any Equity Securities to any Person, the transferring Stockholder shall cause
the prospective transferee to execute and deliver to the Company and Thayer a
Joinder to this Agreement in the form of Exhibit B hereto. Any Transfer or
                                         ---------
attempted Transfer of any Equity Securities in violation of any provision of
this Agreement shall be void, and the Company shall not record such transfer on
its books or treat any purported transferee of such Equity Securities as the
owner of such shares for any purpose.

     11.12 Specific Performance. The rights of the parties under this Agreement
           --------------------
are unique and the failure of a party to perform its obligations hereunder would
irreparably harm the other parties hereto. Accordingly, the parties shall, in
addition to such other remedies as may be available at law or in equity, have
the right to enforce their rights hereunder by actions for specific performance
to the extent permitted by law.

                                     -13-
<PAGE>

     11.13 Further Assurances. Each of the parties hereto agrees to execute all
           ------------------
such further instruments and documents and to take all such further action as
any other party may reasonably require in order to effectuate the terms and
purposes of this Agreement.

     11.14 Publicity. No party shall issue any press release or
           ---------
undertake any publicity concerning this Agreement or any of the transactions
contemplated hereby without the prior written consent of Thayer.

                                     -14-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto, intending to be legally bound
hereby, have caused this Agreement to be executed as of the day and year first
above written.

                                 EMPYREAN GROUP HOLDINGS, INC.
                                 formerly, Business Solutions Group, Inc.)

                                 By:    /s/ Stuart C. Johnson
                                        ----------------------------------------
                                 Name:  Stuart C. Johnson
                                        ----------------------------------------
                                 Title: President & CEO
                                        ----------------------------------------

                                 THAYER ITECH HOLDINGS, L.L.C.

                                 By:    /s/ Robert E. Michalik
                                        ----------------------------------------
                                 Name:  Robert E. Michalik
                                        ----------------------------------------
                                 Title: President
                                        ----------------------------------------

                                 STOCKHOLDERS

                                 BSG HOLDINGS, INC.

                                 By:    /s/ John R. McDougall
                                        ----------------------------------------
                                 Name:  John R. McDougall
                                        ----------------------------------------
                                 Title: President
                                        ----------------------------------------

                                 FBR TECHNOLOGY VENTURE
                                 PARTNERS, LP

                                 By:    /s/ Gene Riechers
                                        ----------------------------------------
                                 Its:   Gene Riechers
                                 Title: Managing Director

                                     -15-
<PAGE>

                                         /s/ Stuart C. Johnson
                                        ----------------------------------------
                                         Stuart C. Johnson

                                         /s/ Thomas B. Modly
                                        ----------------------------------------
                                         Thomas B. Modly

                                         /s/ Jason H. Levine
                                        ----------------------------------------
                                         Jason H. Levine

                                         /s/ Bruce H. Allan
                                        ----------------------------------------
                                         Bruce H. Allan

                                         /s/ Matthew B. Walker
                                        ----------------------------------------
                                         Matthew B. Walker

                                         /s/ Graham B. Perkins
                                        ----------------------------------------
                                         Graham B. Perkins

                                         /s/ David T. Fu
                                        ----------------------------------------
                                         David T. Fu

                                         /s/ Patricia A. Withers
                                        ----------------------------------------
                                         Patricia A. Withers

                                     -16-
<PAGE>

                                                                    EXHIBIT A to
                                                          Stockholders Agreement
                                                          ----------------------

                                 LIST OF HOLDERS
                                 ---------------

Stockholders:
------------

Thayer  ITech Holdings, LLC
c/o Thayer Equity Investors III, L.P.
1455 Pennsylvania Avenue, N.W.
Suite 350
Washington, D.C.  20004
Attention:  Daniel Raskas
            Robert Michalik
Facsimile:  (202) 371-0391
Telephone:  (202) 371-0150

BSG Holdings, Inc.
284 S. Main Street
Suite 700
Alpharetta, Georgia  30004

FBR Technology Venture Partners, LP
1001 19th Street North
Arlington, VA  22209

For either:
Stuart C. Johnson
Thomas B. Modly
Graham B. Perkins
David T. Fu
Jason H. Levine
Matthew B. Walker
Bruce H. Allan or
Patricia A. Withers
c/o Empyrean Group, Inc.
8300 Boone Boulevard
Suite 250
Vienna, Virginia  22182

                                      A-1
<PAGE>

                                                                    EXHIBIT B to
                                                          Stockholders Agreement
                                                          ----------------------

                            FORM OF JOINDER AGREEMENT
                            -------------------------

     This Joinder Agreement (this "Joinder Agreement") is made as of the date
written below by the undersigned (the "Joining Party") and the parties to the
Stockholders Agreement, dated as of August 12, 1999, as amended from time to
time (the "Stockholders Agreement") among Empyrean Group Holdings, Inc., Thayer
and the Stockholders. Capitalized terms used but not defined herein shall have
the meanings given such terms in the Stockholders Agreement.

     Accordingly, the Joining Party hereby acknowledges, agrees and confirms
that, by its execution of this Joinder Agreement, the Joining Party will be
deemed to be a party to the Stockholders Agreement and shall have all of the
obligations of a "Stockholder" thereunder as if it had executed the Stockholders
Agreement. The Joining Party hereby ratifies, as of the date hereof, and agrees
to be bound by, all of the terms, provisions and conditions contained in the
Stockholders Agreement.

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date: _______________________________

STOCKHOLDER                            [ENTITY]

Address:

_____________________________________  By:  ____________________________________
_____________________________________       Name:   ____________________________
_____________________________________       Title:  ____________________________

Tel:_________________________________
Fax:_________________________________

                                                            -OR-

                                         _______________________________________
                                              [Signature of Individual]

                                         _______________________________________
                                                      Print Name

                                      B-1
<PAGE>

                                JOINDER AGREEMENT
                            TO STOCKHOLDERS AGREEMENT
                            -------------------------

     This Joinder Agreement (this "Joinder") is made as of the date written
below by the undersigned (the "Joining Party") and certain parties to the
Stockholders Agreement, dated as of August 12, 1999 (the "Stockholders
Agreement") among Empyrean Group Holdings, Inc., a Delaware corporation (the
"Company"), and the stockholders of the Company. Capitalized terms used but not
defined herein shall have the meanings given such terms in the Stockholders
Agreement.

     Accordingly, the Joining Party hereby acknowledges, agrees and confirms
that, by its execution of this Joinder, the Joining Party will be deemed to be a
party to the Stockholders Agreement and shall have all of the rights and
obligations of a "Stockholder" thereunder as if it had executed the Stockholders
Agreement. The Joining Party and the Company hereby ratify, as of the date
hereof, and agree to be bound by, all of the terms, provisions and conditions
contained in the Stockholders Agreement.

                      [THIS SPACE INTENTIONALLY LEFT BLANK]
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  November 3, 19990

STOCKHOLDER                            /s/ Leo C. Mullen
                                       -----------------------------------------
                                       Leo C. Mullen
Address:

10817 Stanmore Drive
Potomac, MD  20854
Tax I.D. No.: ###-##-####

                                       APPROVED BY:

                                       EMPYREAN GROUP HOLDINGS, INC.

                                       By:  /s/ Stuart C. Johnson
                                            ------------------------------------
                                       Its: Stuart C. Johnson
                                            ------------------------------------
                                            Chairman, President and CEO

                                        THAYER ITECH HOLDINGS, L.L.C.

                                        By:  Thayer Equity Investors, III, L.P.
                                        Its: Managing Member
                                        By:  TC Equity Partners, L.L.C.
                                        Its: General Partner

                                        By:  /s/ Robert E. Michalik
                                            ------------------------------------
                                        Its: Robert E. Michalik
                                            ------------------------------------
                                             Vice President
<PAGE>

IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as of
the date written below.

Date:  November 3, 1999

STOCKHOLDER                            /s/ Helene Patterson
                                       -----------------------------------------
                                       Helene Patterson
Address:

10817 Stanmore Drive
Potomac, MD  20854
Tax I.D. No.: ###-##-####

                                       APPROVED BY:

                                       EMPYREAN GROUP HOLDINGS, INC.

                                       By:  /s/ Stuart C. Johnson
                                            ------------------------------------
                                       Its: Stuart C. Johnson
                                            ------------------------------------
                                            Chairman, President and CEO

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors, III, L.P.
                                       Its: Managing Member
                                       By:  TC Equity Partners, L.L.C.
                                       Its: General Partner

                                       By:  /s/ Robert E. Michalik
                                            ------------------------------------
                                       Its: Robert E. Michalik
                                            ------------------------------------
                                            Vice President
<PAGE>

IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as of
the date written below.

Date:  November 3, 1999

STOCKHOLDER                            /s/ Sidney E. Barcelona
                                       -----------------------------------------
                                       Sidney E. Barcelona
Address:

3323 18th Street, N.W.
Washington, DC  20010
Tax I.D. No.: ###-##-####

                                       APPROVED BY:

                                       EMPYREAN GROUP HOLDINGS, INC.

                                       By:  /s/ Stuart C. Johnson
                                            ------------------------------------
                                       Its: Chairman, President and CEO
                                            ------------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors, III, L.P.
                                       Its: Managing Member
                                       By:  TC Equity Partners, L.L.C.
                                       Its: General Partner

                                       By:  /s/ Robert E. Michalik
                                            ------------------------------------
                                       Its: Robert E. Michalik
                                            ------------------------------------
                                       Vice President
<PAGE>

IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as of
the date written below.

Date:  November 3, 1999

STOCKHOLDER                            /s/ Gretchen Frederick
                                       -----------------------------------------
                                       Gretchen Frederick
Address:

34923 Snickersville Turnpike
Round Hill, VA  22141
Tax I.D. No.: ###-##-####

                                       APPROVED BY:

                                       EMPYREAN GROUP HOLDINGS, INC.

                                       By:  /s/ Stuart C. Johnson
                                            ------------------------------------
                                       Its: Stuart C. Johnson
                                            ------------------------------------
                                            Chairman, President and CEO

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors, III, L.P.
                                       Its: Managing Member
                                       By:  TC Equity Partners, L.L.C.
                                       Its: General Partner

                                       By:  /s/ Robert E. Michalik
                                            ------------------------------------
                                       Its: Robert E. Michalik
                                            ------------------------------------
                                            Vice President
<PAGE>

IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as of
the date written below.

Date:  November 3, 1999

STOCKHOLDER                            /s/ Mark A. Smith
                                       -----------------------------------------
                                       Mark A. Smith
Address:

1604 Great Falls Street
McLean, VA  22101
Tax I.D. No.: ###-##-####

                                       APPROVED BY:

                                       EMPYREAN GROUP HOLDINGS, INC.

                                       By:  /s/ Stuart C. Johnson
                                            ------------------------------------
                                       Its: Stuart C. Johnson
                                            ------------------------------------
                                            Chairman, President & CEO

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors, III, L.P.
                                       Its: Managing Member
                                       By:  TC Equity Partners, L.L.C.
                                       Its: General Partner

                                       By:  /s/ Robert Michalik
                                            ------------------------------------
                                       Its: Robert E. Michalik
                                            ------------------------------------
                                            Vice President
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  November 19, 1999

STOCKHOLDER                            /s/ William K. Stephens
                                       -----------------------------------------
                                       William K. Stephens
Address:

____________________________________
____________________________________
Tax I.D. No.: ______________________

                                       APPROVED BY:

                                       ICONIXX CORPORATION
                                       (f/k/a EMPYREAN GROUP HOLDINGS, INC.)

                                       By:  /s/ Stuart C. Johnson
                                            ------------------------------------
                                       Its: Stuart C. Johnson
                                            ------------------------------------
                                            Chairman, President & CEO

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors, III, L.P.
                                       Its: Managing Member
                                       By:  TC Equity Partners, L.L.C.
                                       Its: General Partner

                                       By:  /s/ Robert E. Michalik
                                            ------------------------------------
                                       Its: Robert E. Michalik
                                            ------------------------------------
                                            Vice President
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of January 18, 2000.

                                       "STOCKHOLDER"

                                       MULLEN PATTERSON, L.L.C.

                                       By:  /s/ Helene Patterson & Leo C. Mullen
                                            ------------------------------------
                                       Its: Managers
                                            ------------------------------------

Address:

Tax I.D. No.:

                                       APPROVED BY:

                                       ICONIXX CORPORATION
                                       (formerly known as
                                       EMPYREAN GROUP HOLDINGS, INC.)

                                       By:  /s/ Stuart C. Johnson
                                            ------------------------------------
                                       Its: Chairman, President & CEO
                                            ------------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors, III, L.P.
                                       Its: Managing Member
                                       By:  TC Equity Partners, L.L.C.
                                       Its: General Partner

                                       By:  /s/ Robert E. Michalik
                                            ------------------------------------
                                       Its: Robert E. Michalik
                                            Vice President
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 8, 2000

STOCKHOLDER                        STUART C. JOHNSON FAMILY LIMITED
                                   PARTNERSHIP

                                   By: /s/ Kelly J. Stanley
                                       -----------------------------------------

Address:

_______________________________
_______________________________
_______________________________

Tax I.D. No.:  54-6453713

                                   APPROVED BY:

                                   ICONIXX CORPORATION

                                   By:    /s/ Jason H. Levine
                                          --------------------------------------
                                   Name:  Jason H. Levine
                                   Title: Vice President and Assistant Secretary

                                   THAYER ITECH HOLDINGS, L.L.C.

                                   By:  Thayer Equity Investors IV, L.P.
                                   Its: Managing Member

                                        By:  TC Equity Partners IV, L.L.C.
                                        Its: General Partner

                                             By:    /s/ Robert E. Michalik
                                                    ----------------------------
                                             Name:  Robert E. Michalik
                                             Title: Vice President
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 10, 2000

STOCKHOLDER                            /s/ Ronald P. Heffernan
                                       -----------------------------------------
                                       Ronald P. Heffernan
Address:
306 Ivy Ct.
------------------------------------
Franklin Lks, NJ  07417
------------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 10, 2000

STOCKHOLDER                            /s/ Michael Matteo
                                       -----------------------------------------
                                       Michael Matteo
Address:
1136 Morris Rd.
---------------------------------
Wymewood, PA  19096
---------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 10, 2000

STOCKHOLDER                            /s/ Lucia Chang Heffernan
                                       -----------------------------------------
                                       Lucia Chang Heffernan
Address:
306 Ivy Ct.
-------------------------------------
Franklin Lakes, NJ 07417
-------------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date: March 10, 2000

STOCKHOLDER                            /s/ Monica Hsu
                                       -----------------------------------------
                                       Monica Hsu
Address:
160 Wea #19L
--------------------------------
NY, NY  10023
--------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 10, 2000

STOCKHOLDER
                                     The Kelly A. Heffernan Trust

                                     By:   /s/ Ronald Heffernan
                                           -------------------------------------
                                     Name: Ronald Heffernan as attorney in fact
                                           -------------------------------------

Address:

920 Cyprus Way
--------------------------------
Boca Raton, FL
--------------------------------

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

Tax I.D. No.:  13-7224727
               ----------

                                     APPROVED BY:

                                     ICONIXX CORPORATION

                                     By:    /s/ Graham B. Perkins
                                           -------------------------------------
                                     Name:  Graham B. Perkins
                                           -------------------------------------
                                     Title: Vice President & Secretary
                                           -------------------------------------

                                     THAYER ITECH HOLDINGS, L.L.C.

                                     By:  Thayer Equity Investors IV, L.P.
                                     Its: Managing Member

                                          By:  TC Equity Partners IV, L.L.C.
                                          Its: General Partner

                                               By:    /s/ Robert E. Michalik
                                                      --------------------------
                                               Name:  Robert E. Michalik
                                                      --------------------------
                                               Title: Vice President
                                                      --------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date: March 10, 2000

STOCKHOLDER
                                     The Tracy Heffernan Cipully Trust

                                     By:   /s/ Ronald Heffernan
                                     Name: Ronald Heffernan as attorney in fact
                                           -------------------------------------

Address:
920 Cyprus Way
-------------------------------
Boca Raton, FL
-------------------------------

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

Tax I.D. No.:  13-7224728
               ----------

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 10, 2000

STOCKHOLDER                          /s/ Robert Friedman as Attorney in Fact
                                     -------------------------------------------
                                     David Musicant
Address:
573 Farmdale Rd.
--------------------------------
Franklin Lakes, NJ
--------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                     APPROVED BY:

                                     ICONIXX CORPORATION

                                     By:    /s/ Graham B. Perkins
                                            ------------------------------------
                                     Name:  Graham B. Perkins
                                            ------------------------------------
                                     Title: Vice President & Secretary
                                            ------------------------------------

                                     THAYER ITECH HOLDINGS, L.L.C.

                                     By:  Thayer Equity Investors IV, L.P.
                                     Its: Managing Member

                                          By:  TC Equity Partners IV, L.L.C.
                                          Its: General Partner

                                               By:    /s/ Robert E. Michalik
                                                      --------------------------
                                               Name:  Robert E. Michalik
                                                      --------------------------
                                               Title: Vice President
                                                      --------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date: March 23, 2000

STOCKHOLDER                          /s/ Christopher Clark
                                     -------------------------------------------
                                     Christopher Clark
Address:
13912 Saddleview Drive
-----------------------------
N. Potomac, MD  20870
-----------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                     APPROVED BY:

                                     ICONIXX CORPORATION

                                     By:    /s/ Jason H. Levine
                                            ------------------------------------
                                     Name:  Jason H. Levine
                                            ------------------------------------
                                     Title: Vice President & Secretary
                                            ------------------------------------

                                     THAYER ITECH HOLDINGS, L.L.C.

                                     By:  Thayer Equity Investors IV, L.P.
                                     Its: Managing Member

                                          By:  TC Equity Partners IV, L.L.C.
                                          Its: General Partner

                                               By:    /s/ Robert E. Michalik
                                                      --------------------------
                                               Name:  Robert E. Michalik
                                                      --------------------------
                                               Title: Vice President
                                                      --------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date: March 23, 2000

STOCKHOLDER                            /s/ Timothy Meinhardt
                                       ---------------------------
                                       Timothy Meinhardt
Address:
14615 Crossway Road
-----------------------------
Rockville, MD  20853
-----------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                     By:    /s/ Jason H. Levine
                                            ------------------------------------
                                     Name:  Jason H. Levine
                                            ------------------------------------
                                     Title: Vice President & Assistant Secretary
                                            ------------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Derrik Deyhimi
                                       -----------------------------
                                       Derrik Deyhimi
Address:
19315 Foxtree Ln
-----------------------------
Houston, TX  77094
-----------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkiins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                                   AB Holdings, L.L.C.

                                       By:    /s/ Robert G. Ackerley
                                              ----------------------------------
                                       Name:  Robert G. Ackerley
                                              ----------------------------------
                                       Title: President
                                              ----------------------------------

Address:
5306 Hollister
-------------------------------
Houston, TX  77040
-------------------------------

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

Tax I.D. No.:  ___-__-____

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Scott Heath
                                       ------------------------------
                                       Scott Heath
Address:
1106 Jackson #A
---------------------------------
Houston, TX  79006
---------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ David Mosley
                                       ------------------------------
                                       David Mosley
Address:
3603 Hugginsway St.
--------------------------------
Pearland, TX  77584
--------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Jeff Jamison
                                       -----------------------------
                                       Jeff Jamison
Address:
Suite 400, 5301 Hollister
---------------------------------
Houston, TX  77040
---------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secrerary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Lance Hack
                                       ----------------------------
                                       Lance Hack
Address:
5301 Hollister
-------------------------------
Houston, TX  77040
-------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Carolyn Jenkins
                                       ------------------------------
                                       Carolyn Jenkins
Address:
5301 Holliser, Ste. 400
------------------------------
Houston, TX  77040
------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Shane Byers
                                       --------------------------
                                       Shane Byers
Address:
5301 Hollister
-----------------------------
Suite 400
-----------------------------
Houston, TX
-----------------------------

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Roman Bartik
                                       ----------------------------
                                       Roman Bartik
Address:
1441 Walee St., #302
--------------------------------
Denver, CO  80202
--------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Genie Neukomm
                                       ------------------------------
                                       Genie Neukomm
Address:
3131 Castlewood
-----------------------------
Houston, TX  77025
-----------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert E. Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------
<PAGE>

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as
of the date written below.

Date:  March 23, 2000
             --

STOCKHOLDER                            /s/ Matthew H. Hartzell
                                       -------------------------------
                                       Matthew H. Hartzell
Address:
5306 Hollister
------------------------------
Houston, TX  77040
------------------------------

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

Tax I.D. No.:  ###-##-####
               --- -- ----

                                       APPROVED BY:

                                       ICONIXX CORPORATION

                                       By:    /s/ Graham B. Perkins
                                              ----------------------------------
                                       Name:  Graham B. Perkins
                                              ----------------------------------
                                       Title: Vice President & Secretary
                                              ----------------------------------

                                       THAYER ITECH HOLDINGS, L.L.C.

                                       By:  Thayer Equity Investors IV, L.P.
                                       Its: Managing Member

                                            By:  TC Equity Partners IV, L.L.C.
                                            Its: General Partner

                                                 By:    /s/ Robert E. Michalik
                                                        ------------------------
                                                 Name:  Robert Michalik
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------

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