DIAMOND TECHNOLOGY PARTNERS INC
DEF 14A, 1999-07-29
MANAGEMENT CONSULTING SERVICES
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<PAGE>   1

                            SCHEDULE 14A INFORMATION
          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                              EXCHANGE ACT OF 1934


Filed by the registrant  [X]

Filed by a party other than the registrant  [ ]

Check the appropriate box:

[ ]  Preliminary proxy statement           [ ] Confidential, for Use of the
                                               Commission Only (as permitted by
[X]  Definitive proxy statement                Rule 14a-6(e)(2))

[ ]  Definitive additional materials

[ ]  Soliciting material pursuant to Rule 14a-11(c) or Rule 14a-12


                    Diamond Technology Partners Incorporated
                (Name of Registrant as Specified in Its Charter)

Payment of filing fee (Check the appropriate box):

[X]  No fee required.

[ ]  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

     (1)  Title of each class of securities to which transaction applies:

     (2)  Aggregate number of securities to which transaction applies:

     (3) Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the filing
fee is calculated and state how it was determined):

     (4)  Proposed maximum aggregate value of transaction:

     (5)  Total fee paid:

     [ ]  Fee paid previously with preliminary materials.

     [ ] Check box if any part of the fee is offset as provided by Exchange
Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
paid previously. Identify the previous filing by registration statement number,
or the Form or Schedule and the date of its filing.

     (1)  Amount previously paid:

     (2)  Form, Schedule or Registration Statement No.:

     (3)  Filing party:

     (4)  Date filed:


<PAGE>   2

                       [DIAMOND TECHNOLOGY PARTNERS LOGO]

                    DIAMOND TECHNOLOGY PARTNERS INCORPORATED
                           875 NORTH MICHIGAN AVENUE
                                   SUITE 3000
                            CHICAGO, ILLINOIS 60611

                            NOTICE OF ANNUAL MEETING

     The Annual Meeting of Stockholders of Diamond Technology Partners
Incorporated (the "Company") will be held at 10:00 a.m. (CDT) on Tuesday, August
10, 1999 at The John Hancock Center, 95th Floor, Chicago Room, 875 North
Michigan Avenue, Chicago, Illinois, for the purpose of:

     1. Electing three directors to serve until the Annual Meeting of
        Stockholders of the Company in 2002 and two directors to serve until the
        Annual Meeting of Stockholders of the Company in 2001.

     2. Approving an amendment to the Diamond Technology Partners Incorporated
        1998 Equity Incentive Plan.

     3. Approving the adoption of the Diamond Technology Partners Incorporated
        1999 Employee Stock Purchase Plan.

     4. Confirming the appointment of KMPG LLP as independent auditors of the
        Company for the fiscal year ending March 31, 2000.

     5. Transacting such other business as may properly come before the meeting.

     The Board of Directors has fixed the close of business on June 29, 1999 as
the record date for the determination of stockholders entitled to notice of, and
to vote at, the Annual Meeting or any adjournment thereof.

     We encourage you to attend the Annual Meeting in person or to vote your
shares by proxy. PLEASE PROMPTLY FILL OUT, SIGN, DATE AND MAIL THE ENCLOSED FORM
OF PROXY IF YOU DO NOT EXPECT TO BE PRESENT AT THE ANNUAL MEETING. A
SELF-ADDRESSED ENVELOPE IS ENCLOSED FOR YOUR CONVENIENCE. NO POSTAGE IS REQUIRED
IF MAILED IN THE UNITED STATES. The proxy is revocable at any time before it is
voted. Returning the proxy will in no way limit your right to vote at the Annual
Meeting if you later decide to attend and vote in person.
                                          /s/ Michael E. Mikolajczyk
                                          Michael E. Mikolajczyk
                                          President and Secretary

July 29, 1999

     THE COMPANY'S ANNUAL REPORT FOR THE FISCAL YEAR ENDED MARCH 31, 1999 IS
BEING MAILED TO STOCKHOLDERS CONCURRENTLY HEREWITH. THE ANNUAL REPORT CONTAINS
FINANCIAL AND OTHER INFORMATION ABOUT THE COMPANY, BUT IS NOT INCORPORATED INTO
THE PROXY STATEMENT AND IS NOT DEEMED TO BE A PART OF THE PROXY SOLICITING
MATERIAL.
<PAGE>   3

                    DIAMOND TECHNOLOGY PARTNERS INCORPORATED
                           875 NORTH MICHIGAN AVENUE
                                   SUITE 3000
                            CHICAGO, ILLINOIS 60611

                                PROXY STATEMENT
                                    FOR THE
          ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON AUGUST 10, 1999

     This Proxy Statement is furnished in connection with the solicitation by
the directors of Diamond Technology Partners Incorporated, a Delaware
corporation (the "Company"), of proxies to be used at the Annual Meeting of
Stockholders to be held on August 10, 1999 (the "Annual Meeting") at The John
Hancock Center, 95th Floor, Chicago Room, 875 North Michigan Avenue, Chicago,
Illinois. This Proxy Statement and the related form of proxy are being mailed to
stockholders commencing on or about July 29, 1999.

     If the enclosed form of proxy is executed and returned, the shares
represented by them will be voted as directed on all matters properly coming
before the Annual Meeting for a vote. The proxies may be revoked at any time
prior to their exercise by giving notice to the Company in writing or by a later
executed proxy. Attendance at the Annual Meeting will not automatically revoke a
proxy, but a stockholder attending the Annual Meeting may request a ballot and
vote in person, thereby revoking a prior granted proxy.

     Stockholders of record at the close of business on June 29, 1999 will be
entitled to vote at the Annual Meeting. On that date, the Company had
outstanding and entitled to vote 10,071,317 shares of Class A Common Stock, par
value $.001 per share ("Class A Common"), and 3,496,003 shares of Class B Common
Stock, par value $.001 per share ("Class B Common" and, together with the Class
A Common, the "Common Stock"). Each share of Class A Common is entitled to one
vote for a nominee for each of the five directorships to be filled and one vote
on each other matter brought before the Annual Meeting. Each share of Class B
Common is entitled to five votes for each such nominee and five votes on each
other matter brought before the Annual Meeting. The shares of Class B Common
will be voted by Melvyn E. Bergstein, Chief Executive Officer of the Company,
pursuant to an irrevocable proxy granted to Mr. Bergstein by the holders of
Class B Common.

     At the Annual Meeting, in accordance with Delaware law and the Company's
By-Laws, the inspectors of election appointed by the Board of Directors for the
Annual Meeting shall determine the presence of a quorum and shall tabulate the
results of stockholder voting. As provided by Delaware law and the Company's
By-Laws, the holders of a majority of the Company's Common Stock, issued and
outstanding, and entitled to vote at the Annual Meeting and present in person or
by proxy at the Annual Meeting, shall constitute a quorum for such meeting. The
inspectors of election will treat properly executed proxies marked "abstain" as
"present" for purposes of determining whether a quorum has been achieved at the
Annual Meeting. Such inspectors shall also treat proxies held in "street name"
by brokers that are not voted on all proposals to come before the Annual Meeting
("broker non-votes") as "present."

     Class A Common and Class B Common will vote as a single class on all
matters anticipated to be brought before the Annual Meeting. In accordance with
Delaware law, nominees for election as directors receiving the greatest number
of votes will be elected directors. In accordance with Delaware law and the
Company's By-Laws, the holders of a majority of the voting power of shares of
the Company's stock which has voting power present in person or by proxy, and
which is actually voted, shall decide any other proposal which is brought before
the Annual Meeting. As a result, abstentions in respect of any proposal and
broker non-votes will not be counted for purposes of determining whether such
proposal has received the requisite approval by the Company's stockholders and
may therefore have the effect of being a vote against the proposal.
<PAGE>   4

     In accordance with Delaware law and the Company's By-Laws, the Company may,
by a vote of the stockholders, adjourn the Annual Meeting to a later date or
dates, without changing the record date. If the Company were to determine that
an adjournment were desirable, the appointed proxies would use the discretionary
authority granted pursuant to the proxy cards to vote in favor of such an
adjournment.

                           BUSINESS TO BE TRANSACTED

     The Board of Directors will present four proposals to the stockholders of
the Company at the Annual Meeting. Information concerning the first proposal,
"Election of Directors", is found on pages 2-3 of this Proxy Statement.
Information concerning the second proposal, "Approval of an Amendment to the
Diamond Technology Partners Incorporated 1998 Equity Incentive Plan" is found on
pages 13-16. Information concerning the third proposal, "Approval of Adoption of
the Diamond Technology Partners Incorporated 1999 Employee Stock Purchase Plan"
is found on pages 16-18. Information concerning the fourth proposal,
"Confirmation of Appointment of Independent Auditors", is found on page 18 of
this Proxy Statement.

1. ELECTION OF DIRECTORS

     The Board of Directors of the Company consists of three classes, as nearly
equal in number as possible. One of the three classes, comprising approximately
one-third of the directors, is elected each year to succeed the directors whose
terms are expiring. The number of directors of the Company, as determined by the
Board under Article 5 of the Company's Certificate of Incorporation and Article
3 of its By-Laws, was recently increased from eight to ten. In addition, one of
the directors elected for a three-year term at last year's annual meeting of
stockholders, Mr. James Spira, resigned from the Board effective June 30, 1999.
See "Employment Agreements and Certain Other Arrangements." Accordingly, there
are three vacancies to be filled on the Board. In order to keep the three
classes as nearly equal in number as possible, one vacancy will be filled in
Class III with a term expiring at the Annual Meeting of the Stockholders in
August 2002 and the remaining two vacancies will be filled in Class II with a
term expiring at the Annual Meeting of the Stockholders in August 2001.

     IDENTIFICATION OF DIRECTORS

     The incumbent directors of the Company are as follows:

<TABLE>
<CAPTION>
NAME                                              AGE                     POSITIONS
- ----                                              ---                     ---------
<S>                                               <C>   <C>
Melvyn E. Bergstein(1)..........................  57    Chairman of the Board of Directors and Chief
                                                        Executive Officer
Michael E. Mikolajczyk(2)(4)....................  47    President and Secretary
Christopher J. Moffitt(3)(5)....................  44    Director
Donald R. Caldwell(2)(4)(5).....................  53    Director
Edward R. Anderson(3)(5)........................  52    Director
John D. Loewenberg(1)(4)........................  59    Director
Alan C. Kay(2)..................................  59    Director
</TABLE>

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

(1) Term expires as of the 2001 Annual Meeting of Stockholders

(2) Term expires as of the 2000 Annual Meeting of Stockholders

(3) Term expires as of the 1999 Annual Meeting of Stockholders

(4) Member of the Audit Committee

(5) Member of the Compensation Committee

     NOMINEES

     It is intended that shares represented by proxies in the enclosed form will
be voted for the election of the nominees identified below to serve as directors
for the term specified herein or until their successors are

                                        2
<PAGE>   5

elected, unless contrary instructions are received. Messrs. Anderson, Moffitt
and Gutstein will, if elected, serve as Class III directors and commence their
three-year term immediately after the August 1999 Annual Meeting of
Stockholders. Mr. Gordon and Dr. Sviokla will, if elected, serve as Class II
directors, along with Messrs. Bergstein and Loewenberg, and as such complete the
remaining two years of such term which expires at the Annual Meeting of
Stockholders in August 2001. Of the five nominees listed below, only Messrs.
Anderson and Moffitt presently serve as directors of the Company. If an
unexpected occurrence should make it necessary, in the judgment of the proxy
holders, to substitute some other person for any of the nominees, such shares
will be voted for such other person as the proxy holders may select.

Edward R. Anderson............   Mr. Anderson has been a director of the Company
                                 since June 1994. In July 1999, Mr. Anderson
                                 became the Chairman and Chief Executive Officer
                                 of E-Certify, Inc. From January 1994 to July
                                 1999 he was president, chief executive officer
                                 and a director of CompuCom Systems, Inc. He
                                 joined CompuCom as chief operating officer in
                                 August 1993. From 1988 to 1993, Mr. Anderson
                                 served as president and chief operating officer
                                 of ComputerLand USA. Prior to that time, Mr.
                                 Anderson held executive and management
                                 positions with The Computer Factory, W.R. Grace
                                 & Company, and American Express Company. Mr.
                                 Anderson is also a member of the board of
                                 directors of The M/A/R/C Group.

Mark L. Gordon................   Mr. Gordon is an attorney with the law firm
                                 Gordon & Glickson LLC and has been a partner of
                                 that firm since August 1979, currently serving
                                 as its managing partner. Mr. Gordon founded
                                 Gordon & Glickson's technology practice and
                                 advises a wide range of emerging technology
                                 companies, including the Company, on business
                                 and legal matters. Mr. Gordon also serves as a
                                 member of the Board of Directors of New Era of
                                 Networks, Inc., an enterprise application
                                 integration software company.

Adam J. Gutstein..............   Mr. Gutstein co-founded the Company in January
                                 1994 and has served as its Chief Operating
                                 Officer responsible for the client-serving
                                 operations of the Company since July 1998. As a
                                 Partner and Vice President of the Company, he
                                 has led several of the firm's vertical
                                 practices serving the telecommunications,
                                 energy, financial service and healthcare
                                 industries. In addition, Mr. Gutstein served as
                                 managing partner of business development. Prior
                                 to joining Diamond, Mr. Gutstein was a vice
                                 president at Technology Solutions Company and a
                                 manager with Andersen Consulting.

Christopher J. Moffitt........   Mr. Moffitt co-founded the Company in January
                                 1994 and served as its Senior Vice President
                                 and Secretary until July 1, 1999. He has been a
                                 member of the Board of Directors of the Company
                                 since January 1994. From 1988 to 1993, he
                                 served as senior vice president of Technology
                                 Solutions Company. Prior to that time, Mr.
                                 Moffitt held several consulting and senior
                                 technology positions with Arthur Young (a
                                 predecessor to Ernst & Young LLP), Neiman
                                 Marcus and Electronic Data Systems.

John J. Sviokla...............   Dr. Sviokla has been a Partner and Vice
                                 President of the Company since September 1998.
                                 Prior to joining Diamond, Dr. Sviokla was a
                                 professor at the Harvard Business School from
                                 October 1986 to August 1998. His pioneering
                                 work on Marketspace established Harvard's first
                                 course on electronic commerce, and he
                                 co-authored

                                        3
<PAGE>   6

                                 the seminal articles "Managing in the
                                 Marketspace" and "Exploiting the Virtual Value
                                 Chain," both appearing in the Harvard Business
                                 Review. Dr. Sviokla has authored over 90
                                 articles, cases, and edited books, and he has
                                 been a consultant to large and small companies
                                 around the world. He has been a guest professor
                                 at many universities including, Kellogg, MIT,
                                 The London Business School, the Melbourne
                                 Business School and the Hong Kong Institute of
                                 Science and Technology. His current research
                                 and consulting focuses on how to help large
                                 companies unlock value in the new economy.

     THE BOARD OF DIRECTORS RECOMMENDS THAT YOU VOTE FOR THE ELECTION OF EDWARD
R. ANDERSON, MARK L. GORDON, ADAM J. GUTSTEIN, CHRISTOPHER J. MOFFITT AND JOHN
J. SVIOKLA AS DIRECTORS OF THE COMPANY.

     DIRECTORS CONTINUING IN OFFICE

     The following directors' terms in office continue beyond the 1999 Annual
Meeting of Stockholders:

Melvyn E. Bergstein...........   Mr. Bergstein co-founded the Company in January
                                 1994 and has served as its Chairman, Chief
                                 Executive Officer and President until July 1,
                                 1998, when Mr. Bergstein vacated the office of
                                 President in favor of Michael E. Mikolajczyk.
                                 Mr. Bergstein has been a director of the
                                 Company since January 1994. Prior to
                                 co-founding the Company, Mr. Bergstein held
                                 several senior executive positions with
                                 Technology Solutions Company from 1991 to 1993.
                                 Prior to that time, Mr. Bergstein held several
                                 senior positions with other consulting firms,
                                 including twenty-one years in various positions
                                 with the Arthur Andersen & Co.'s consulting
                                 division (now Andersen Consulting).

Donald R. Caldwell............   Mr. Caldwell has been a director of the Company
                                 since June 1994 and has been the Chief
                                 Executive Officer of North Atlantic Technology
                                 Fund, L.P. since March 1999. From February 1996
                                 to March 1999, Mr. Caldwell was president and
                                 chief operating officer and a director of
                                 Safeguard Scientifics, Inc. ("Safeguard"). Mr.
                                 Caldwell was an executive vice president of
                                 Safeguard from December 1993 to February 1996.
                                 From April 1991 to December 1993, Mr. Caldwell
                                 was the president of Valley Forge Capital
                                 Group, Ltd. Prior to that time, Mr. Caldwell
                                 held various executive and management positions
                                 with a predecessor company of Cambridge
                                 Technology Partners (Massachusetts), Inc. and
                                 Arthur Young & Co. (a predecessor to Ernst &
                                 Young, LLP). Mr. Caldwell currently serves on
                                 the board of directors of First Consulting
                                 Group, in addition to numerous privately held
                                 companies and other civic organizations.

Alan C. Kay...................   Dr. Kay has been a director of the Company
                                 since June 1996 and is currently vice president
                                 of research and development for Walt Disney
                                 Imagineering, Inc. and is a Disney fellow. From
                                 1984 to 1996, Dr. Kay was an Apple fellow at
                                 Apple Computer, Inc. Prior to that time, Dr.
                                 Kay held scientific positions at Atari
                                 Corporation and the Xerox Palo Alto Research
                                 Center. He was a research associate and
                                 lecturer in computer science at Stanford
                                 University from 1969-1971.
                                        4
<PAGE>   7

Michael E. Mikolajczyk........   Mr. Mikolajczyk joined the Company in April
                                 1994 and served as its Senior Vice President,
                                 Chief Financial and Administrative Officer
                                 until July 1998 and a member of its Board of
                                 Directors since April 1994. Effective July 1,
                                 1998, Mr. Mikolajczyk became President of the
                                 Company and effective July 1, 1999, its
                                 Secretary. From 1993 to 1994, he served as
                                 senior vice president of finance and
                                 administration and chief financial officer for
                                 Technology Solutions Company. Prior to that
                                 time, he held several senior financial
                                 positions at MCI Telecommunications
                                 Corporation.

John D. Loewenberg............   Mr. Loewenberg is currently managing partner
                                 and a consultant with JDL Enterprises, a
                                 consulting firm. Previously, Mr. Loewenberg was
                                 an executive vice president and chief operating
                                 officer of Connecticut Mutual from 1995 to
                                 1996. Prior to joining Connecticut Mutual, Mr.
                                 Loewenberg held several senior management
                                 positions with Aetna Life and Casualty and its
                                 affiliates. Mr. Loewenberg was chairman of
                                 Precision Systems, Inc. until April 1996 and is
                                 a director of CompuCom Systems, Inc., Sanchez
                                 Computer Associates, Inc., and DocuCorp
                                 International, Inc. Mr. Loewenberg has been a
                                 director of the Company since October 1996.

     DIRECTORS' MEETINGS AND COMMITTEES

     The Board of Directors has an Audit Committee, which has authority to
review and recommend to the Board internal accounting and financial controls for
the Company and accounting principles and auditing practices and procedures to
be employed in the preparation and review of financial statements. The Audit
Committee was established on February 18, 1997 and met twice during the fiscal
year ended March 31, 1999 ("fiscal 1999"). The Board of Directors also has a
Compensation Committee, which has authority to review and recommend to the Chief
Executive Officer and the Board policies, practices and procedures relating to
the compensation of managerial employees and the establishment and
administration of employee benefit plans, except for stock option plans. The
Compensation Committee was established on February 18, 1997 and met informally
during fiscal 1999. All decisions regarding managerial employee compensation
were reviewed with and made by the Board of Directors as a whole. The Company's
By-Laws provide that a majority of the Compensation Committee shall consist of
members of the Board of Directors who are not officers or employees of the
Company or any subsidiary of the Company. The Board of Directors has no
Nominating Committee.

     The Board of Directors held six meetings in fiscal 1999. All of the
directors attended at least 75 percent of the total meetings held by the Board
of Directors and by the committees on which they served during fiscal 1999.

     COMPENSATION OF DIRECTORS

     Directors receive no cash compensation for their services as directors,
except for reimbursement of expenses incurred in connection with attending
meetings of the Board of Directors and its committees. Directors are granted
options to purchase Class A Common of the Company at the discretion of the Board
of Directors. The exercise price of each option is equal to the Fair Market
Value of the shares on the date of grant. The options vest over periods of three
to five years and have terms ranging from five years to seven years. During
fiscal 1999, the Company did not grant any stock options to its directors.

                                        5
<PAGE>   8

     COMPENSATION OF EXECUTIVE OFFICERS

     The following table sets forth certain information concerning compensation
paid or accrued in fiscal years 1999, 1998 and 1997 with respect to the
Company's Chief Executive Officer and the four other executive officers who were
most highly compensated in fiscal 1999 (collectively, the "Named Officers"):

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                    LONG-TERM
                                                                                   COMPENSATION
                                                    ANNUAL COMPENSATION(1)          AWARDS --
                                              ----------------------------------    SECURITIES
                                     FISCAL                         OTHER ANNUAL    UNDERLYING       ALL OTHER
NAME AND PRINCIPAL POSITION           YEAR     SALARY     BONUS     COMPENSATION     OPTIONS      COMPENSATION(2)
- ---------------------------          ------    ------     -----     ------------   ------------   ---------------
<S>                                  <C>      <C>        <C>        <C>            <C>            <C>
Melvyn E. Bergstein................   1999    $500,000   $225,000      $2,297             --           $8,550
Chairman and Chief                    1998     506,250    300,000          --         47,603            8,550
Executive Officer                     1997     503,125         --          --             --            8,550
Michael E. Mikolajczyk.............   1999     400,000    180,000          --             --            3,306
President and Secretary               1998     400,000    240,000          --         36,962            3,306
                                      1997     383,333         --          --         37,529            3,306
Christopher J. Moffitt.............   1999     356,250    135,000          --             --            1,938
Former Senior Vice President          1998     450,000    270,000          --         42,283            1,938
and Secretary(3)                      1997     431,250         --          --             --            1,938
James C. Spira.....................   1999     400,000    180,000          --             --            8,550
Former Senior Vice President(3)       1998     460,400    270,000          --         12,483            8,550
                                      1997     479,169         --          --             --            5,472
Adam J. Gutstein...................   1999     350,000    157,500          --             --            1,254
Chief Operating Officer               1998     350,000    210,000          --         31,642            1,026
                                      1997     287,500         --       3,826         16,500            1,026
</TABLE>

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

(1) The compensation described in this table does not include medical, group
    life insurance or other benefits received by the Named Officers which are
    available generally to all salaried employees of the Company and certain
    perquisites and other personal benefits, securities or property received by
    the Named Officers which do not exceed the lesser of $50,000 or 10% of the
    aggregate of any such Named Officer's salary in the fiscal year.

(2) Represents excess group life insurance premiums paid in the respective year.

(3) Effective June 30, 1999, Mr. Moffitt resigned as an officer of the Company.
    Effective July 1, 1999, Mr. Spira began active part-time status as an
    Advisory Partner. For a description of their continuing arrangements with
    the Company, see "Employment Agreements and Certain Other Arrangements" on
    page 6 of this Proxy Statement.

              EMPLOYMENT AGREEMENTS AND CERTAIN OTHER ARRANGEMENTS

     Messrs. Bergstein, Mikolajczyk, Moffitt, Spira and Gutstein have employment
agreements with the Company that provide for annual salaries and bonuses that
are determined in accordance with the Second Amended and Restated Partners
Operating Agreement, dated April 1, 1996 (the "Partners Operating Agreement").
See "Partners Operating Agreement" on page 12. These employment agreements are
terminable at any time by either party and contain non-competition provisions,
which last for 18 months following cessation of employment with the Company. In
addition, the employment agreements prohibit employees from disclosing any of
the Company's confidential information and require them to disclose to the
Company, and to grant ownership to the Company all ideas, inventions and
business plans developed during the course of employment to the extent they
relate to the business of the Company, result from work performed for the
Company or result from use of any of the Company's property.

                                        6
<PAGE>   9

     Effective as of June 30, 1999, Mr. Moffitt resigned his position as an
officer of the Company. Mr. Moffitt will, if elected, continue as a member of
the Company's Board of Directors. All of his unvested shares of restricted stock
and options will continue to vest in accordance with their terms for so long as
he is a director. Mr. Moffitt has agreed to be a consultant to the Company on an
as-needed basis.

     Mr. Spira and the Company have agreed that effective July 1, 1999, Mr.
Spira will begin active part-time status as an Advisory Partner. In such role,
Mr. Spira will manage specific client relationships, provide ongoing oversight
to specific client engagements and participate in client development efforts. As
compensation for such services, Mr. Spira will receive an annual salary of
$100,000 and his unvested options and restricted stock will continue to vest in
accordance with their terms. Mr. Spira, as a continuing employee, will also be
eligible to participate in Diamond's medical benefit plans, life insurance and
long-term disability coverage. As previously noted, effective June 30, 1999, Mr.
Spira resigned from the Company's Board of Directors.

     STOCK OPTIONS

     On April 1, 1999, the Company granted the following options to the Named
Officers: Mr. Bergstein (20,400); Mr. Mikolajczyk (19,200); Mr. Moffitt (4,200);
Mr. Spira (14,200); and Mr. Gutstein (28,600). These options vest
proportionately in 20% increments on the first through fifth anniversaries of
the date of grant, respectively. The options were granted in part for
compensation for services rendered for fiscal 1999 and in part as a promotion
for services to be rendered for the fiscal year ending March 31, 2000. No
options were actually granted to the Named Officers during fiscal 1999, although
the foregoing grants were, as noted, partially attributable to fiscal 1999. The
option grants were made pursuant to the Company's 1998 Equity Incentive Plan and
are not transferable in any way other than upon the death of the employee or
pursuant to an employee relations order. Shares issued upon the exercise of
these options are subject to the terms and restrictions contained in the Voting
and Stock Restriction Agreement. See "Voting and Stock Restriction Agreement."

     The following table sets forth information concerning options exercised
during fiscal 1999 and the number and the hypothetical value of certain
unexercised options of the Company held by the Named Officers as of March 31,
1999. This table is presented solely for purposes of complying with the
Commission rules and does not necessarily reflect the amounts the Named Officers
will actually receive upon any sale of the shares acquired upon exercise of the
options.

<TABLE>
<CAPTION>
                                                           NUMBER OF SECURITIES          VALUE OF UNEXERCISED
                                                          UNDERLYING UNEXERCISED             IN-THE-MONEY
                                   SHARES                       OPTIONS AT                    OPTIONS AT
                                  ACQUIRED                    MARCH 31, 1999                MARCH 31, 1999
                                     ON       VALUE     ---------------------------   ---------------------------
              NAME                EXERCISE   REALIZED   EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
              ----                --------   --------   -----------   -------------   -----------   -------------
<S>                               <C>        <C>        <C>           <C>             <C>           <C>
Melvyn E. Bergstein.............       --    $     --     --             47,603           $--         $ 76,760
Michael E. Mikolajczyk..........   33,404     240,946     --             57,587            --          502,760
Christopher J. Moffitt..........       --          --     --             42,283            --           68,181
James C. Spira..................   37,126     266,565     --             49,607            --          808,735
Adam J. Gutstein................   10,025      23,095     --             52,267            --          448,642
</TABLE>

     REPORT OF THE COMPENSATION COMMITTEE ON EXECUTIVE COMPENSATION

     The Compensation Committee of the Company's Board of Directors (the
"Compensation Committee") was established on February 18, 1997 and did not have
any formal meetings to consider executive officer compensation for the fiscal
year ended March 31, 1999. The functions of the Compensation Committee were
carried out by the full Board of Directors. The Board of Directors has furnished
the following report on executive compensation:

                                        7
<PAGE>   10

                        REPORT ON EXECUTIVE COMPENSATION

          The compensation of the Named Officers and all other officers who have
     been promoted as a "partner" of the Company ("Partner") was determined in
     accordance with the Partners' Operating Agreement and the Partners'
     Compensation Program. Under these agreements, officers' compensation is
     approved by the Company's Management and Management Compensation
     Committees, each a non-board committee composed of Partners and established
     under the Partners' Operating Agreement, and by the Board of Directors. The
     purpose and design of this structure is to provide a combination of base
     salary, bonus and equity to the Company's Partners that will link
     individual rewards to the Company's success, motivate teamwork, encourage
     the Partners to maintain equity interests in the Company and reward
     individual performance.

          Base salaries are established on the basis of the Partners' experience
     and contributions to the Company. Bonuses are based on the Company's
     achievement of certain financial targets established in its annual business
     plan. The Partners' Compensation Program provides that the bonus will be
     paid in cash. The Named Officers, as Partners, share in a bonus pool funded
     pursuant to a formula that first provides for a return on revenue and for
     bonuses to non-Partner employees. Target bonuses for all Partners, as a
     percentage of base salary, are established prior to the fiscal year in
     which they take effect.

     CEO COMPENSATION

          Mr. Bergstein's salary for the year ended March 31, 1999 was $500,000,
     plus a bonus of $225,000 as compared to $506,250, plus a $300,000 bonus,
     for the prior fiscal year. Mr. Bergstein's compensation was based on his
     leadership of the Company; the Company's dramatic growth since being
     founded in early 1994; his contributions to recruiting key employees,
     directors and advisory board members; and his contribution to the revenues
     of the Company by attracting significant clients and by actively
     participating in serving the Company's clients. As with all other Partners,
     Mr. Bergstein's compensation as Chief Executive Officer is subject to the
     approval of the Management Committee, the Management Compensation
     Committee, the Partners and the Board of Directors. The Board of Directors
     believes his compensation to be reasonable.

     POLICY ON QUALIFYING COMPENSATION

          Section 162(m) of the Internal Revenue Code of 1986, as amended (the
     "Code"), provides that publicly held companies may not deduct in any
     taxable year compensation in excess of one million dollars paid to any of
     the individuals named in the Summary Compensation Table that is not
     "performance-based" as defined in Section 162(m). In order for incentive
     compensation to qualify as "performance-based" compensation under Section
     162(m), the Company's discretion to grant awards must be strictly limited.
     The Board of Directors believes that the benefit to the Company of
     retaining the ability to exercise discretion under the Company's incentive
     compensation plans outweighs the limited risk of loss of tax deductions
     under Section 162(m). Therefore, the Company does not currently intend to
     seek to qualify its incentive compensation plans under Section 162(m).

                                          By the Board of Directors:

                                            Edward R. Anderson
                                            Melvyn E. Bergstein
                                            Donald R. Caldwell
                                            Alan C. Kay
                                            John D. Loewenberg
                                            Michael E. Mikolajczyk
                                            Christopher J. Moffitt

                                        8
<PAGE>   11

     COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

          The Compensation Committee currently consists of Mr. Anderson, Mr.
     Caldwell and Mr. Moffitt. Mr. Moffitt is a Named Officer of the Company.
     None of the Named Officers of the Company has served on the board of
     directors or on the compensation committee of any other entity, any of
     whose officers served either on the Board of Directors or on the
     Compensation Committee of the Company. The Compensation Committee, however,
     was established on February 18, 1997 and did not have any formal meetings
     to consider executive officer compensation for the fiscal year ended March
     31, 1999. For fiscal 1999, recommendations concerning the aggregate
     compensation of all of the Company's Partners (including its Named
     Officers) were made to the Board of Directors by the Company's Chief
     Executive Officer and the Company's Management Committee, and decisions
     regarding such compensation were made by the full Board of Directors. Under
     the terms of the Partners' Operating Agreement, allocations among the
     Company's Partners (including its executive officers) are made by the
     Management Committee upon approval of the aggregate amount of such
     compensation by the Board of Directors and the approval of the actual
     allocations by at least seventy percent of the Company's Partners. See
     "Partners' Operating Agreement" on page 12 of this Proxy Statement.

                                        9
<PAGE>   12

                      STOCK PRICE PERFORMANCE PRESENTATION

     The following graph compares the Company's total annual stock price
performance on Class A Common against the total stock price performance of the
NASDAQ Market Index and the Russell 2000 Index for the periods indicated. The
Company does not believe that there is a representative published industry or
line-of-business index or a representative industry peer group of public
companies against which to measure the Company's stock price performance.
Therefore, under Securities and Exchange Commission regulations, the Company has
selected the Russell 2000 Index, an index of companies with similar market
capitalization to the Company, to use as a representative peer group. The graph
presents the year-end value of a $100 investment on February 25, 1997 in the
Company's Class A Common at the $5.50 initial offering price and in each of the
NASDAQ Market Index and the Russell 2000 Index and assumes the reinvestment of
dividends, if any.

                     COMPARE CUMULATIVE TOTAL RETURN AMONG
                       DIAMOND TECHNOLOGY PARTNERS, INC.,
                   NASDAQ MARKET INDEX AND RUSSELL 2000 INDEX

<TABLE>
<CAPTION>
                                                               DIAMOND
                                                              TECHNOLOGY                   NASDAQ
MEASUREMENT PERIOD                                             PARTNERS     RUSSELL 2000   MARKET
(FISCAL YEAR COVERED)                                        INCORPORATED      INDEX       INDEX
- ---------------------                                        ------------   ------------   ------
<S>                                                          <C>            <C>            <C>
2/25/97....................................................     100.00         100.00      100.00
3/31/97....................................................     109.09          95.28       93.54
3/31/98....................................................     495.45         135.29      141.36
3/31/99....................................................     419.27         112.67      184.73
</TABLE>

PERFORMANCE GRAPH

                   ASSUMES $100 INVESTED ON FEBRUARY 25, 1997
                          ASSUMES DIVIDEND REINVESTED
                        FISCAL YEAR ENDED MARCH 31, 1999

                                       10
<PAGE>   13

     Set forth in the following table is information as of May 31, 1999, with
respect to (1) each person who is known to the Company to be the beneficial
owner of more than five percent of the Class A Common, (2) each person who is
known to the Company to be the beneficial owner of more than five percent of the
Class B Common, and (3) the beneficial ownership of Class A Common and Class B
Common by the directors, the Named Officers and all executive officers and
directors as a group. Beneficial ownership of Class A Common and Class B Common
has been determined for this purpose in accordance with Rules 13d-3 and 13d-5 of
the Securities and Exchange Commission ("SEC") under the Securities Exchange Act
of 1934, as amended, (the "Exchange Act"). Accordingly, the amounts in the table
do not purport to represent beneficial ownership for any purpose other than
compliance with SEC reporting requirements. Further, beneficial ownership as
determined in this manner does not necessarily bear on the economic incidence of
ownership of Class A Common or Class B Common.

                   AMOUNT AND NATURE OF BENEFICIAL OWNERSHIP

<TABLE>
<CAPTION>
                                                                         NUMBER OF   PERCENT OF
NAME AND ADDRESS                                              CLASS(2)    SHARES      CLASS(3)
- ----------------                                              --------   ---------   ----------
<S>                                                           <C>        <C>         <C>
Melvyn E. Bergstein, individually(1)(4).....................  Class A      159,288       1.6%
                                                              Class B      478,141      13.8
Melvyn E. Bergstein, as proxyholder.........................  Class A           --        --
                                                              Class B    2,984,415      86.2
Safeguard Scientifics, Inc.(5)..............................  Class A    1,185,035      11.4
800 The Safeguard Building                                    Class B           --        --
435 Devon Park Drive
Wayne, PA 19087
Pilgrim Baxter & Associates, Ltd. ..........................  Class A      682,000       6.7
825 Duportail Road                                            Class B           --        --
Wayne, PA 19087
Christopher J. Moffitt(1)(6)(12)............................  Class A       15,270        **
                                                              Class B      175,346       5.1
Michael E. Mikolajczyk(1)(7)(12)............................  Class A        3,788        **
                                                              Class B      436,372      12.6
James C. Spira(8)(12).......................................  Class A          300        **
                                                              Class B      138,892       4.0
Adam J. Gutstein(12)........................................  Class A       10,760        **
                                                              Class B      152,013       4.4
John D. Loewenberg(9).......................................  Class A        6,600        **
                                                              Class B           --        --
Alan Kay(10)................................................  Class A       66,001        **
                                                              Class B           --        --
Donald R. Caldwell..........................................  Class A       46,517        **
                                                              Class B           --        --
Edward R. Anderson(11)......................................  Class A       18,340        **
                                                              Class B           --        --
All executive officers and directors as a group (10
  persons)(12)..............................................  Class A      335,652       3.3
                                                              Class B    3,472,742     100.0
</TABLE>

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

** Less than 1% of the class outstanding

 (1) The address of each of Messrs. Bergstein, Mikolajczyk and Moffitt is 875
     North Michigan Avenue, Suite 3000, Chicago, Illinois 60611.

                                       11
<PAGE>   14

 (2) In the event that any share of Class B Common is transferred to any party
     other than a "Permitted Holder" (an employee of the Company or the Company)
     or if a beneficial or record holder of a share of Class B Common Stock
     ceases to be a Permitted Holder, the share is automatically and immediately
     converted into a share of Class A Common. Shares of Class A Common may not
     be converted into shares of Class B Common.

 (3) Solely for the purpose of determining beneficial ownership herein, the
     number of shares of Common Stock deemed outstanding as of May 31, 1999 (i)
     assumes 10,138,248 shares of Class A Common and 3,462,556 shares of Class B
     Common were outstanding as of such date, and (ii) includes additional
     shares of Common Stock issuable pursuant to options or warrants held by
     such owner which may be exercised within 60 days after May 31, 1999
     ("presently exercisable options"), as set forth below.

 (4) Excludes 199,880 shares of Class A Common held in trust for certain members
     of the Bergstein family. Includes 261 shares of Class B Common issuable
     pursuant to presently exercisable options.

 (5) Includes a warrant which is presently exercisable for 241,182 shares of
     Class A Common. The warrant and all shares of Class A Common are held of
     record by Safeguard Scientifics (Delaware), Inc., a privately held
     subsidiary of Safeguard. Excludes all shares of Common Stock owned as of
     May 31, 1999 by Cambridge Technology Partners (Massachusetts), Inc. of
     which Safeguard owns approximately 21% of the voting securities. See
     "Certain Relationships and Related Transactions" below.

 (6) Excludes 96,250 shares of Class A Common held in trust for certain members
     of the Moffitt family. Includes 229 shares of Class B Common issuable
     pursuant to presently exercisable options.

 (7) Includes 8,447 shares of Common Stock issuable pursuant to presently
     exercisable options. Excludes 41,250 shares of Class A Common held in trust
     for certain members of the Mikolajczyk family.

 (8) Includes 1,249 shares of Common Stock issuable pursuant to presently
     exercisable options.

 (9) Consists of 6,600 shares of Class A Common issuable pursuant to presently
     exercisable options.

(10) Consists of 66,001 shares of Class A Common issuable pursuant to presently
     exercisable options.

(11) Includes 6,600 shares of Class A Common issuable pursuant to presently
     exercisable options.

(12) All holders of Class B Common, including Messrs. Mikolajczyk, Moffitt,
     Spira and Gutstein, have granted to Mr. Bergstein, as the current Chief
     Executive Officer, the right to vote such shares pursuant to the terms of
     irrevocable proxies. See "Voting and Stock Restriction Agreement." As of
     May 31, 1999 includes 3,984,415 shares of Class B Common subject to such
     proxies. Includes in the aggregate 79,201 shares of Class A Common and
     10,186 shares of Class B Common issuable pursuant to presently exercisable
     options held by all directors and executive officers.

     CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     On November 8, 1996, the Company entered into a $2.0 million subordinated
loan agreement with Safeguard Scientifics, Inc. ("Safeguard") for general
working capital purposes. In connection with this loan, the Company issued
warrants to Safeguard for the purchase of 526,597 shares of the Company's Common
Stock at $5.50 per share. The loan had a maturity date of November 1, 2001, but
was required to be repaid in full upon the consummation of the initial public
offering of Class A Common in April 1997. The Company repaid this loan on April
11, 1997 with proceeds from the initial public offering. On January 31, 1997
Safeguard transferred warrants to purchase 241,182 shares of Class A Common to
Technology Leaders L.P. and Technology Leaders Offshore C.V., affiliates of
Safeguard ("Technology Leaders"), and warrants to purchase 44,233 shares of
Class A Common to CIP Capital L.P., an affiliate of Safeguard. The rights
granted under the warrants expire on November 1, 2001. Technology Leaders
exercised their warrants and sold all of their shares of Class A Common in
connection with the public offering of Class A Common in April 1998.

     PARTNERS' OPERATING AGREEMENT

     Certain employees of the Company are internally designated as "Partners."
The designation does not refer to a partner of a general or limited partnership.
All of the Partners of the Company have agreed to be bound by the Partners'
Operating Agreement. Each individual proposed to be hired as, or promoted to, a

                                       12
<PAGE>   15

Partner, must agree to become bound by and a party to the Partners' Operating
Agreement. The Partners' Operating Agreement provides for, among other things:
(i) nomination procedures for the nomination of candidates to the office of
Chief Executive Officer; (ii) procedures for the removal and retention of the
Chief Executive Officer; (iii) procedure for the admission and removal of
Partners; and (iv) the compensation of management personnel. In addition, the
Partners' Operating Agreement provides that the Chief Executive Officer must be
selected from among the Partners pursuant to the procedures set forth in such
Agreement, subject to the right of the Company's Board of Directors to veto any
such person nominated by the Partners. The Chief Executive Officer may be
removed by the Board of Directors or for certain other specified reasons.

     VOTING AND STOCK RESTRICTION AGREEMENT

     Each employee-stockholder and certain other stockholders of the Company
have agreed to be bound by the Second Amended and Restated Voting and Stock
Restriction Agreement dated as of August 4, 1997 (the "Voting and Stock
Restriction Agreement"). Any employee considering purchasing shares of the Class
B Common from the Company must agree to become bound by and a party to the
Voting and Stock Restriction Agreement (to the extent not already bound).

     The Voting and Stock Restriction Agreement provides for, among other
things: (i) the grant of a proxy by each employee-stockholder of the Company to
the Chief Executive Officer of the Company conveying the right to vote their
shares of Class B Common, (ii) rights of first offer of the Company to purchase
shares of Class B Common offered by employee-stockholders; (iii) certain rights
of first offer of the Company to purchase shares of Common Stock offered by
certain stockholders including Safeguard and CIP Capital L.P.; and (iv)
restrictions on the transferability of the certain shares of Common Stock.

     SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     Section 16(a) of the Exchange Act requires the Company's officers and
directors, and persons who own more than ten percent of a registered class of
the Company's equity securities, to file reports of ownership and changes in
ownership of such securities with the SEC and NASDAQ. Officers, directors and
greater than ten percent beneficial owners are required by applicable
regulations to furnish the Company with copies of all Section 16(a) forms they
file.

     Based upon its review of the copies of Section 16(a) forms received by it,
and upon written representations from reporting persons concerning the necessity
of filing a Form 5-Annual Statement of Changes in Beneficial Ownership, the
Company believes that, during fiscal 1998, all filing requirements applicable
for reporting persons were met.

2. APPROVAL OF AN AMENDMENT TO THE DIAMOND TECHNOLOGY PARTNERS
   INCORPORATED 1998 EQUITY INCENTIVE PLAN

     The Board of Directors has determined that, in order to give the Company
the ongoing flexibility to attract and retain the management and employee talent
necessary for the Company's continued success, selected managers, including
directors and officers, and employees should be granted equity-based incentive
compensation awards.

     In February 1998, the Board of Directors approved the Diamond Technology
Partners Incorporated 1998 Equity Incentive Plan (the "Plan") pursuant to which
the Company's Management Committee may grant incentive awards in the form of
stock options, stock appreciation rights and stock. The Plan was also approved
by the stockholders at last year's Annual Meeting of Stockholders. As initially
adopted, the Plan authorized 3,500,000 shares of Class B Common (including the
Class A Common Stock into which such Class B Common may be converted, the
"Stock") to be issuable or transferable pursuant to awards. The number of shares
of Stock to be issuable or transferable under the Plan may be increased by any
shares represented by awards made pursuant to or taken into account under the
1994 Stock Option Plan that have been forfeited, expired, canceled or settled
without issuance of shares.

                                       13
<PAGE>   16

     In May and July 1999, the Board approved, subject to stockholder approval,
amendments to the Plan that would: (i) increase the number of authorized shares
that could be issued under the Plan by 3,300,000 shares, and (ii) provide for
the issuance of shares under the Plan to certain consultants qualifying as
"employees" within the meaning of Form S-8 under the Securities Act of 1933, as
amended.

     Assuming a quorum is present, the affirmative vote of the holders of a
majority of Common Stock present, whether in person or represented by proxy, and
voting will be required to approve the foregoing amendments to the Plan. The
Plan amendments will become effective on the date it is approved by the
stockholders.

                   SUMMARY OF THE 1998 EQUITY INCENTIVE PLAN

     A summary of the Plan is set forth below. The summary is qualified in its
entirety by reference to the full text of the Plan, which is attached to this
Proxy Statement as Appendix A.

     The primary purpose of the Plan is to promote the long-term success of the
Company and its stockholders by strengthening the Company's ability to attract
and retain highly competent executives and other selected employees and to
provide a means to encourage stock ownership and proprietary interest in the
Company.

     Any employee of (i) the Company, (ii) any entity that is directly or
indirectly controlled by the Company or (iii) any entity in which the Company
has a significant equity interest shall be eligible to receive one or more
awards under the Plan. Any directors of the Company who are not employed by the
Company will be considered "employees" eligible to receive awards under the
Plan, but only for purposes of nonqualified stock options. As of May 31, 1999,
the Company had approximately 370 employees.

     Under the Plan, participants may receive stock options, stock appreciation
rights ("SARs") or stock awards, as discussed in greater detail below. The
Management Committee will approve the type or types of awards to be made to each
participant. Awards may be granted singly, in combination or in tandem. Awards
also may be made in combination or in tandem with, in replacement of, as
alternatives to or as the payment form for grants or rights under any other
compensation plan or individual contract or agreement of the Company, including
the plan of any acquired entity.

     Stock Options. A stock option represents a right to purchase a specified
number of shares of the Stock during a specified period as determined by the
Management Committee. The purchase price per share for each stock option shall
be not less than 100% of Fair Market Value on the date of the grant, subject to
certain exceptions. A stock option may be in the form of an incentive stock
option ("ISO") which complies with Section 422 of the Internal Revenue Code of
1986, as amended (the "Code") or a nonqualified stock option. The price at which
shares may be purchased under a stock option shall be paid in full by the holder
of the stock option at the time of exercise in cash or pursuant to such other
method permitted by the Management Committee, including tendering shares of
Stock, third-party exercise transactions or any combination of such methods.

     SARs. An SAR generally represents a right to receive a payment, in cash
and/or shares, equal to the excess of the Fair Market Value of a specified
number of shares of Stock on the date the SAR is exercised over the Fair Market
Value on the date the SAR was granted, as set forth in the applicable award
agreement. "Fair Market Value," for all purposes of the Plan, shall mean the
average of the closing price of a share of Stock on the NASDAQ National Market
for the ten trading days immediately preceding the date of the grant.

     Stock Awards. A stock award is a grant made or denominated in shares of
Stock or units equivalent to shares of Stock. All or part of any stock award may
be subject to conditions and restrictions established by the Management
Committee and set forth in the applicable award agreement, which may include,
but is not limited to, continuous service with the Company or the achievement of
performance goals.

     The Management Committee may provide that any awards under the Plan earn
dividends or dividend equivalents. Such dividends or dividend equivalents may be
paid currently or may be credited to a participant's account. Any crediting of
dividends or dividend equivalents may be subject to such restrictions and
conditions

                                       14
<PAGE>   17

as the Management Committee may establish, including reinvestment in additional
shares or share equivalents.

     The aggregate number of shares of Stock which may be transferred to
participants under the Plan, as proposed to be amended, is 6,800,000, plus any
shares represented by awards made pursuant to or taken into account under the
1994 Stock Option Plan that have been forfeited, expired, canceled or settled
without issuance of shares.

     The aggregate number of shares of Stock that may be covered by awards
granted to any single individual under the Plan shall not exceed 150,000 shares
per fiscal year of the Company. The aggregate number of shares of Stock that may
be granted in the form of ISOs shall be 3,500,000 shares (6,800,000 shares, if
the proposed amendment is adopted). Shares subject to awards under the Plan
which expire, terminate or are canceled prior to exercise, or in the case of
stock awards, do not vest, shall thereafter be available for the granting of
other awards under the Plan.

     In the event of any stock dividend, stock split, combination or exchange of
shares, merger, consolidation, spin-off, recapitalization or other distribution
(other than normal cash dividends) of Company assets to stockholders or any
other change affecting the shares of Stock or share price, the Management
Committee may, but is not required to, adjust (i) the aggregate number of shares
of Stock issuable under the Plan, (ii) each outstanding award made under the
Plan and (iii) the exercise price per share for any outstanding stock options,
SARs or similar awards under the Plan.

     Payment of awards may be in the form of cash, shares of Stock, other awards
or combinations thereof as the Management Committee shall determine at the time
of the grant, and with such restrictions as it may impose. The Management
Committee may also require or permit participants to elect to defer the issuance
of shares or the settlement of awards in cash under such rules and procedures as
it may establish under the Plan. It also may provide that deferred settlements
include the payment or crediting of interest on the deferral amounts, or the
payment or crediting of dividend equivalents where amounts are denominated in
share equivalents.

     Awards granted under the Plan shall not be transferable or assignable other
than: (i) by will or the laws of descent and distribution, (ii) by gift or other
transfer of an award to any trust or estate in which the original award
recipient or such recipient's spouse or other immediate relative has a
substantial beneficial interest, or to a spouse or other immediate relative,
provided that any such transfer is permitted by Rule 16b-3 of the Exchange Act
as in effect when the transfer occurs and the Board of Directors does not
rescind this provision prior to such transfer, or (iii) pursuant to a domestic
relations order (as defined by the Code).

     The Plan may be amended by the Management Committee as it deems necessary
or appropriate to better achieve the purposes of the Plan, except that no such
amendment shall be made without the approval of the Company's stockholders if
such amendment would increase the maximum number of shares (as adjusted pursuant
to Plan provisions) issuable under the Plan. The Board of Directors may suspend
the Plan or terminate the Plan at any time; provided, that no such action shall
adversely affect any outstanding benefit.

     Federal Income Tax Consequences. In general, under the Code as presently in
effect, a participant will not be deemed to receive any income for federal
income tax purposes at the time an option or SAR is granted or a restricted
stock award is made, nor will the Company be entitled to a tax deduction at that
time. However, when any part of an option or SAR is exercised, when restrictions
on restricted stock lapse, or when an unrestricted stock award is made, the
federal income tax consequences may be summarized as follows:

          1. In the case of an exercise of a nonqualified option, the
     participant will recognize ordinary income in an amount equal to the
     difference between the option price and the Fair Market Value of the Stock
     on the exercise date.

          2. In the case of an exercise of an SAR, the participant will
     recognize ordinary income on the exercise date in an amount equal to any
     cash and unrestricted Stock received, at Fair Market Value on the exercise
     date.

                                       15
<PAGE>   18

          3. In the case of an exercise of an option or SAR payable in
     restricted stock, or in the case of an award of restricted stock, the
     immediate federal income tax effect for the recipient will depend on the
     nature of the restrictions. Generally, the value of the Stock will not be
     taxable to the recipient as ordinary income until the year in which his or
     her interest in the Stock is freely transferable or is no longer subject to
     a substantial risk of forfeiture. However, the recipient may elect to
     recognize income when the Stock is received, rather than when his or her
     interest in the Stock is freely transferable or is no longer subject to a
     substantial risk of forfeiture. If the recipient makes this election, the
     amount taxed to the recipient as ordinary income is determined as of the
     date of receipt of the restricted stock.

          4. In the case of an ISO there is no tax liability at the time of
     exercise. However, the excess of the Fair Market Value of the Stock on the
     exercise date over the option price is included in the participant's income
     for purposes of the alternative minimum tax. If no disposition of the ISO
     stock is made before the later of one year from the date of exercise or two
     years from the date the ISO is granted, the participant will realize a
     long-term capital gain or loss upon a sale of the stock equal to the
     difference between the option price and the sale price. If the stock is not
     held for the required period, ordinary income tax treatment will generally
     apply to the amount of any gain at sale or exercise, whichever is less, and
     the balance of any gain or loss will be treated as capital gain or loss
     (long-term or short-term, depending on whether the shares have been held
     for more than one year).

          5. Upon the exercise of a nonqualified option or SAR, the award of
     stock or the recognition of income on restricted stock, the Company will
     generally be allowed an income tax deduction equal to the ordinary income
     recognized by the employee. The Company does not receive an income tax
     deduction as a result of the exercise of an ISO, provided that the ISO
     stock is held for the required period as described above. When a cash
     payment is made pursuant to the award, the recipient will recognize the
     amount of the cash payment as ordinary income, and the Company will
     generally be entitled to a deduction in the same amount.

     THE BOARD OF DIRECTORS RECOMMENDS THAT YOU VOTE FOR THE APPROVAL OF THE
AMENDMENT TO THE DIAMOND TECHNOLOGY PARTNERS INCORPORATED 1998 EQUITY INCENTIVE
PLAN.

3. APPROVAL OF ADOPTION OF THE DIAMOND TECHNOLOGY PARTNERS INCORPORATED 1999
   EMPLOYEE STOCK PURCHASE PLAN

     The Board believes that the adoption of Diamond Technology Partners
Incorporated 1999 Employee Stock Purchase Plan (the "ESPP") is in the best
interests of the Company. By providing the Company's employees with an
attractive opportunity to purchase the Company's Class B Common, the Board
believes that participating employees will, as holders, be more likely to think
and act like owners. In addition, in order to attract and retain quality
employees, the Company must provide a competitive benefits package. The ESPP is
an attractive addition to the Company's existing employee benefits.

     For these reasons, the Board approved the ESPP in April 1999, subject to
adoption by the stockholders. The ESPP provides eligible employees the
opportunity to purchase the Company's Class B Common at a discount through
payroll deductions. The Company has designed the ESPP so that participating
employees and the Company receive favorable tax treatment, as described further
below. The ESPP will be administered by a Committee comprised of certain senior
officers of the Company (the "Committee").

     The initial enrollment date for the ESPP was April 21, 1999, with
additional opportunities to enroll on any July 1, October 1, January 1 or April
1 during the term of the ESPP (the "Enrollment Date"). Eligible employees remain
enrolled for 24 months after the applicable Enrollment Date, unless the employee
changes the amount of his or her payroll deductions or withdraws from the ESPP.
Upon enrollment, an employee is granted the right to purchase shares of Class B
Common under the ESPP.

     Eligible employees may elect on a quarterly basis on any Enrollment Date to
have up to 10% of their gross base salary deducted and paid into the ESPP
throughout the upcoming quarter, except that no employee may purchase shares
having an aggregate market value of more than $6,250 for any quarter, even if
that

                                       16
<PAGE>   19

amount is within 10% of their gross base salary. An employee may terminate his
or her participation any time before the end of the quarter and receive a refund
in cash of amounts deducted for that quarter. At the end of the quarter the
amount deducted is automatically applied toward the purchase of the Company's
Class B Common at a discounted price (the "Discount Price") which is the lesser
of:

          (i) 85% of the Fair Market Value of the shares on the Enrollment Date,
     or

          (ii) 85% of the Fair Market Value of the shares on the date of the
     purchase of shares, which is the last day of the quarter (the "Purchase
     Date").

     The "Fair Market Value" shall be the average of the closing price of a
share of the Company's Class A Common on the NASDAQ National Market System for
the ten trading days immediately preceding the Enrollment Date or the Purchase
Date, as applicable.

     Shares for the ESPP will be purchased by the Company in the open market (in
accordance with SEC regulations for open-market purchases), or, at the
discretion of the Committee, will be previously acquired treasury shares or
authorized and unissued shares. A total of 600,000 shares, which would represent
approximately 4.42% of the total shares currently outstanding, may be sold under
the ESPP.

     All active full-time and part-time employees of the Company or any of its
subsidiaries are eligible to participate in the ESPP, except that no employee
who, immediately after subscribing for shares under the ESPP, would own stock
having 5% or more of the total combined voting power or value of all classes of
stock of the Company or any subsidiary is eligible to participate in the ESPP.
However, the Board or the Committee can, without further stockholder approval,
terminate the ESPP at any time, or amend the ESPP, as long as no amendment
increases or decreases the number of shares authorized for the ESPP or causes
the ESPP not to meet the applicable requirements of Code Section 423.

     If adopted by stockholders, the ESPP will be deemed to have been effective
as of April 21, 1999 and terminate on April 21, 2004, unless earlier terminated
by the Board or the Committee.

     The foregoing is merely a summary of the principal aspects of the ESPP. The
ESPP is set forth in its entirety in Appendix B to this Proxy Statement, and
stockholders should refer to the ESPP for more complete and detailed
information.

     Federal Income Tax Consequences.  The Company expects the ESPP to be an
"employee stock purchase plan" under the Internal Revenue Code. As such,
employees who participate in the ESPP will not recognize income (and the Company
will not receive any deduction) at the time they purchase shares, even though
the employees will receive the benefit of the Discount Price. Employees will,
however, recognize income when they sell or dispose of the shares.

     The tax consequence to an employee of selling or disposing of the shares
generally depends on how long he or she has held the shares. If an employee
sells or disposes of the shares within two years after the Enrollment Date, he
or she will recognize ordinary income to the extent the fair market value of the
shares on the Purchase Date exceeded the Discount Price. Provided an employee
sells the shares at least one year after the Purchase Date, any additional gain
is capital gain. The Company may take a tax deduction in the amount of any
ordinary gain realized by the employee under this scenario.

     In contrast, if the employee sells or disposes of the shares at least one
year after the Enrollment Date and two years after the Purchase Date, he or she
will recognize ordinary income only to the extent of 15% of the fair market
value of the shares on the Offer Date or the Purchase Date, whichever is less
(not to exceed the gain realized in the sale or disposition). Any additional
gain is capital gain. The Company may take a tax deduction in the amount of any
ordinary gain realized by the employee under this scenario.

     The foregoing is only a summary of federal income tax consequences to the
Company and participating employees, and does not cover the tax consequences
that might arise in every individual circumstance.

     The closing price of the Company's Class A Common on June 30, 1999, on the
NASDAQ National Market System, was $22 3/8.

                                       17
<PAGE>   20

     THE BOARD OF DIRECTORS RECOMMENDS THAT YOU VOTE FOR THE APPROVAL OF THE
ADOPTION OF THE DIAMOND TECHNOLOGY PARTNERS INCORPORATED 1999 EMPLOYEE STOCK
PURCHASE PLAN.

4. CONFIRMATION OF APPOINTMENT OF INDEPENDENT AUDITORS

     The Board of Directors of the Company recommends a vote for ratification of
the appointment of KPMG LLP as the independent auditors of the Company and its
subsidiary to audit the books and accounts for the Company and its subsidiary
for the current fiscal year. It is intended that the shares represented by
proxies in the enclosed form will be voted for confirmation of KPMG LLP as the
independent auditors, unless contrary instructions are received. It is expected
that representatives of KPMG LLP will attend the Annual Meeting, with the
opportunity to make a statement if they so desire, and will be available to
respond to appropriate questions.

     THE BOARD OF DIRECTORS RECOMMENDS THAT YOU VOTE FOR RATIFICATION OF THE
APPOINTMENT OF KPMG LLP AS INDEPENDENT AUDITORS OF THE COMPANY FOR THE FISCAL
YEAR ENDING MARCH 31, 2000.

                      SUBMISSION OF STOCKHOLDER PROPOSALS

     Proposals of stockholders intended to be eligible for inclusion in the
Company's proxy statement and form of proxy relating to the Company's next
annual meeting must be received at the Company's executive offices on or before
April 12, 2000, unless the 2000 annual meeting of stockholders is held earlier
than July 11, 2000. If the date of the 2000 annual meeting of stockholders is
advanced earlier than July 11, 2000 such proposals will be required to be
received a reasonable period of time in advance of the Company's solicitation of
proxies for that meeting. Such proposals should be submitted by certified mail,
return receipt requested, addressed to the Company, 875 North Michigan Avenue,
Suite 3000, Chicago, Illinois 60611 Attention: Secretary.

                            SOLICITATION OF PROXIES

     The Company will bear the costs of soliciting proxies from its
stockholders. In addition to the use of the mails, proxies may be solicited by
the directors, officers and employees of the Company by personal interview,
electronic mail, telephone or telegram. Such directors, officers and employees
will not be additionally compensated for such solicitation, but may be
reimbursed for out-of-pocket expenses incurred in connection therewith.
Arrangements will also be made with brokerage houses and other custodians,
nominees and fiduciaries for the forwarding of solicitation material to the
beneficial owners of Class A Common held of record by such persons, and the
Company will reimburse such brokerage houses, custodians, nominees and
fiduciaries for reasonable out-of-pocket expenses incurred in connection
therewith.

                                 OTHER MATTERS

     The directors know of no other matters which are likely to be brought
before the meeting, but if any such matters properly come before the meeting the
persons named in the enclosed proxy, or their substitutes, will vote the proxy
in accordance with their best judgment.
                                          /s/ Michael E. Mikolajczyk
                                          Michael E. Mikolajczyk
                                          President and Secretary

                                       18
<PAGE>   21

                                   APPENDIX A

                    DIAMOND TECHNOLOGY PARTNERS INCORPORATED

                           1998 EQUITY INCENTIVE PLAN
                          (AS PROPOSED TO BE AMENDED)

     1.  Purpose.  The Diamond Technology Partners Incorporated 1998 Equity
Incentive Plan (the "Plan") is intended to promote the long-term success of
Diamond Technology Partners Incorporated (the "Company") and its stockholders by
strengthening the Company's ability to attract and retain highly competent
executives and other selected employees and to provide a means to encourage
stock ownership and proprietary interest in the Company.

     2.  Term.  The Plan shall become effective upon the date (the "Effective
Date") it is approved by the Board of Directors of the Company (the "Board"),
subject to its ratification and approval by the affirmative vote of the holders
of a majority of the securities of the Company present or represented, and
entitled to vote at a meeting of stockholders of the Company, and shall
terminate at the close of business on the tenth anniversary of the Effective
Date unless terminated earlier under Section 14. Certain awards made with the
approval of the Company's Management Committee in March and April 1998 (the
"March/April Awards") prior to the Effective Date were intended to be pursuant
to the Plan and are therefore included under the Plan. After termination of the
Plan, no future awards may be granted, but previously granted awards shall
remain outstanding in accordance with their applicable terms and conditions and
the terms and conditions of the Plan.

     3.  Plan Administration.  The Company's Management Committee, as
constituted from time to time, or any other committee appointed by the Board
(the "Committee") shall be responsible for administering the Plan. Except as
otherwise provided in the Plan, the Committee shall have full and exclusive
power to interpret the Plan and to adopt such rules, regulations and guidelines
for carrying out the Plan as it may deem necessary or proper, and such power
shall be executed in the best interests of the Company and in keeping with the
objectives of the Plan. The interpretation and construction of any provision of
the Plan or any option or right granted hereunder and all determinations by the
Committee in each case shall be final, binding and conclusive with respect to
all interested parties.

     4.  Eligibility.  Any employee of the Company shall be eligible to receive
one or more awards under the Plan. Directors of the Company who are not employed
by the Company will be considered "employees" eligible to receive awards under
the Plan, but only for purposes of nonqualified stock options. Consultants of
the Company qualifying as "employees" within the meaning of Form S-8 under the
Securities Act of 1933, as amended (the "Securities Act"), shall also be
eligible to receive awards under the Plan. "Company" includes any entity that is
directly or indirectly controlled by the Company or any entity in which the
Company has a significant equity interest, as determined by the Committee.

     5.  Shares of Common Stock Subject to the Plan.  Subject to the provisions
of Section 6 of the Plan, the aggregate number of shares of Class B Common
Stock, $0.001 par value, (and shares of Class A Common Stock into which such
Class B Common Stock may be converted) of the Company ("Stock") which may be
transferred to participants under the Plan shall be:

          (i) 6,800,000 shares (including the March/April Awards); plus

          (ii) any shares that are represented by awards or portions of awards
     under the Diamond Technology Partners Incorporated 1994 Stock Option Plan,
     as amended (the "Prior Plan") that are forfeited, expired, cancelled or
     settled without the issuance of shares; plus

          (iii) any shares that are represented by options or portions of
     options not awarded under the Prior Plan but included in clause (i) of
     Section 3 of the Prior Plan that are forfeited, expired, cancelled or
     settled without the issuance of shares; plus

          (iv) any shares issued and included in clause (i) of Section 3 of the
     Prior Plan that are repurchased by the Company.

                                       A-1
<PAGE>   22

     The aggregate number of shares of Stock that may be covered by awards
granted to any single individual under the Plan shall not exceed 150,000 shares
per fiscal year of the Company. The aggregate number of shares of Stock that may
be granted in the form of incentive stock options ("ISOs") intended to comply
with Section 422 of the Internal Revenue Code of 1986, as amended (the "Code")
shall be 6,800,000 shares.

     Shares subject to awards under the Plan which expire, terminate, or are
canceled prior to exercise or, in the case of awards granted under Section 8.3,
do not vest, shall thereafter be available for the granting of other awards.
Shares which have been exchanged by a participant as full or partial payment to
the Company in connection with any award under the Plan also shall thereafter be
available for the granting of other awards. In instances where a stock
appreciation right ("SAR") or other award is settled in cash, the shares covered
by such award shall remain available for issuance under the Plan. Likewise, the
payment of cash dividends and dividend equivalents paid in cash in conjunction
with outstanding awards shall not be counted against the shares available for
issuance. Any shares that are issued by the Company, and any awards that are
granted through the assumption of, or in substitution for, outstanding awards
previously granted by an acquired entity shall not be counted against the shares
available for issuance under the Plan.

     Any shares of Stock issued under the Plan may consist in whole or in part
of authorized and unissued shares or of treasury shares, and no fractional
shares shall be issued under the Plan. Cash may be paid in lieu of any
fractional shares in settlements of awards under the Plan.

     6.  Adjustments.  In the event of any stock dividend, stock split,
combination or exchange of shares, merger, consolidation, spin-off,
recapitalization or other distribution (other than normal cash dividends) of
Company assets to stockholders, or any other change affecting shares of Stock or
share price, such proportionate adjustments, if any, as the Committee in its
discretion may deem appropriate to reflect such change shall be made with
respect to (1) the aggregate number of shares of Stock that may be issued under
the Plan; (2) each outstanding award made under the Plan; and (3) the exercise
price per share for any outstanding stock options, SARs or similar awards under
the Plan.

     7.  Fair Market Value.  "Fair Market Value," for all purposes of the Plan,
shall mean the average of the closing price of a share of Stock on the NASDAQ
National Market System for the ten trading days immediately preceding the date
of grant.

     8.  Awards.  Except as otherwise provided in this Section 8, the Committee
shall determine the type or types of award(s) to be made to each participant and
the number of shares of Stock subject to each such award, and any other terms,
conditions and limitations applicable to such award. Awards may be granted
singly, in combination or in tandem. Awards also may be made in combination or
in tandem with, in replacement of, as alternatives to or as the payment form for
grants or rights under any other compensation plan or individual contract or
agreement of the Company including those of any acquired entity. The types of
awards that may be granted under the Plan are:

          8.1 Stock Options.  A stock option is a right to purchase a specified
     number of shares of Stock during a specified period. The purchase price per
     share for each stock option shall be not less than 100% of Fair Market
     Value on the date of grant, except if a stock option is granted
     retroactively in tandem with or as a substitution for a SAR, the exercise
     price may be no lower than the Fair Market Value of a share as set forth in
     award agreements for such tandem or replaced SAR. A stock option may be in
     the form of an ISO which complies with Section 422 of the Code. The price
     at which shares may be purchased under a stock option shall be paid in full
     by the optionee at the time of the exercise in cash or such other method
     permitted by the Committee, including (1) tendering shares; (2) authorizing
     a third party to sell the shares (or a sufficient portion thereof) acquired
     upon exercise of a stock option and assigning the delivery to the Company
     of a sufficient amount of the sale proceeds to pay for all the shares
     acquired through such exercise; or (3) any combination of the above.

          8.2  SARs.  A SAR is a right to receive a payment, in cash and/or
     shares, equal to the excess of the Fair Market Value of a specified number
     of shares of Stock on the date the SAR is exercised over the Fair Market
     Value on the date the SAR was granted as set forth in the applicable award
     agreement; except that if a SAR is granted retroactively in tandem with or
     in substitution for a stock option, the

                                       A-2
<PAGE>   23

     designated Fair Market Value set forth in the award agreement shall be no
     lower than the Fair Market Value of a share for such tandem or replaced
     stock option.

          8.3  Stock Awards.  A stock award is a grant made or denominated in
     shares or units equivalent in value to shares. All or part of any stock
     award may be subject to conditions and restrictions as set forth in the
     applicable award agreement, which may be based on continuous service with
     the Company or the achievement of performance goals related to profits,
     profit growth, profit-related return ratios, cash flow or total stockholder
     return, where such goals may be stated in absolute terms or relative to
     comparable companies.

     9.  Dividends and Dividend Equivalents.  Any awards under the Plan may earn
dividends or dividend equivalents as set forth in the applicable award
agreement. Such dividends or dividend equivalents may be paid currently or may
be credited to a participant's account. Any crediting of dividends or dividend
equivalents may be subject to such restrictions and conditions may be
established in the applicable award agreement, including reinvestment in
additional shares or share equivalents.

     10.  Deferrals and Settlements.  Payment of awards may be in the form of
cash, stock, other awards or combinations thereof as shall be determined at the
time of grant, and with such restrictions as may be imposed in the award
agreement. The Committee also may require or permit participants to elect to
defer the issuance of shares or the settlement of awards in cash under such
rules and procedures as it may establish under the Plan. It also may provide
that deferred settlements include the payment or crediting of interest on the
deferral amounts, or the payment or crediting of dividend equivalents where the
deferral amounts are denominated in shares.

     11.  Transferability and Exercisability.  Awards granted under the Plan
shall not be transferable or assignable other than (1) by will or the laws of
descent and distribution; (2) by gift or other transfer of an award to any trust
or estate in which the original award recipient or such recipient's spouse or
other immediate relative has a substantial beneficial interest, or to a spouse
or other immediate relative, provided that any such transfer is permitted by
Rule 16b-3 under the Exchange Act as in effect when such transfer occurs and the
Board does not rescind this provision prior to such transfer; or (3) pursuant to
a domestic relations order (as defined by the Code). However, any award so
transferred shall continue to be subject to all the terms and conditions
contained in the instrument evidencing such award.

     12.  Award Agreements.  Awards under the Plan shall be evidenced by
agreements as approved by the Committee that set forth the terms, conditions and
limitations for each award, which may include the term of an award (except that
in no event shall the term of any ISO exceed a period of ten years from the date
of its grant), the provisions applicable in the event the participant's
employment terminates, and the Committee's authority to amend, modify, suspend,
cancel or rescind any award. The Committee need not require the execution of any
such agreement, in which case acceptance of the award by the participant shall
constitute agreement to the terms of the award.

     13.  Acceleration and Settlement of Awards.  The Committee shall have the
discretion, exercisable at any time before a sale, merger, consolidation,
reorganization, liquidation or change of control of the Company, as defined by
the Committee, to provide for the acceleration of vesting and for settlement,
including cash payment of an award granted under the Plan, upon or immediately
before the effectiveness of such event. However, the granting of awards under
the Plan shall in no way affect the right of the Company to adjust, reclassify,
reorganize or otherwise change its capital or business structure, or to merge,
consolidate, dissolve, liquidate, sell or transfer all or any portion of its
businesses or assets.

     14.  Plan Amendment.  The Plan may be amended by the Committee as it deems
necessary or appropriate to better achieve the purposes of the Plan, except that
no such amendment shall be made without the approval of the Company's
stockholders which would increase the number of shares available for issuance in
accordance with Sections 5 and 6 of the Plan. The Board may suspend the Plan or
terminate the Plan at any time; provided, that no such action shall adversely
affect any outstanding benefit. Any shares authorized under Section 5 (or any
amendment thereof) with respect to which no Award is granted prior to
termination of the Plan, or with respect to which an Award is terminated,
forfeited or canceled after termination of the Plan, shall

                                       A-3
<PAGE>   24

automatically be transferred to any subsequent stock incentive plan or similar
plan for employees of the Company.

     15.  Tax Withholding.  The Company shall have the right to deduct from any
settlement of an award made under the Plan, including the delivery or vesting of
shares, a sufficient amount to cover withholding of any federal, state or local
taxes required by law, or to take such other action as may be necessary to
satisfy any such withholding obligations. The Committee may, in its discretion
and subject to such rules as it may adopt, permit participants to use shares to
satisfy required tax withholding and such shares shall be valued at the Fair
Market Value as of the settlement date of the applicable award.

     16.  Registration of Shares.  Notwithstanding any other provision of the
Plan, the Company shall not be obligated to offer or sell any shares unless such
shares are at that time effectively registered or exempt from registration under
the Securities Act and the offer and sale of such shares are otherwise in
compliance with all applicable federal and state securities laws and the
requirements of any stock exchange or similar agency on which the Company's
securities may then be listed or quoted. The Company shall have no obligation to
register the shares under the federal securities laws or take any other steps as
may be necessary to enable the shares to be offered and sold under federal or
other securities laws. Prior to receiving shares a Plan participant may be
required to furnish representations or undertakings deemed appropriate by the
Company to enable the offer and sale of the shares or subsequent transfers of
any interest in such shares to comply with the Securities Act and other
applicable securities laws. Certificates evidencing shares shall bear any legend
required by, or useful for the purposes of compliance with, applicable
securities laws, this Plan or award agreements.

     17.  Other Benefit and Compensation Programs.  Unless otherwise
specifically determined by the Committee, settlements of awards received by
participants under the Plan shall not be deemed a part of a participant's
regular, recurring compensation for purposes of calculating payments or benefits
from any Company benefit plan or severance program. Further, the Company may
adopt other compensation programs, plans or arrangements as it deems appropriate
or necessary.

     18.  Unfunded Plan.  Unless otherwise determined by the Committee, the Plan
shall be unfunded and shall not create (or be construed to create) a trust or a
separate fund or funds. The Plan shall not establish any fiduciary relationship
between the Company and any participant or other person. To the extent any
person holds any rights by virtue of an award granted under the Plan, such
rights shall be no greater than the rights of an unsecured general creditor of
the Company.

     19.  Use of Proceeds.  The cash proceeds received by the Company from the
issuance of shares pursuant to awards under the Plan shall constitute general
funds of the Company.

     20.  Regulatory Approvals.  The implementation of the Plan, the granting of
any award under the Plan, and the issuance of shares upon the exercise or
settlement of any award shall be subject to the Company's procurement of all
approvals and permits required by regulatory authorities having jurisdiction
over the Plan, the awards granted under it or the shares issued pursuant to it.

     21.  Employment Rights.  The Plan does not constitute a contract of
employment and participation in the Plan will not give a participant the right
to continue in the employ of the Company on a full-time, part-time or any other
basis. Participation in the Plan will not give any participant any right or
claim to any benefit under the Plan, unless such right or claim has specifically
accrued under the terms of the Plan.

     22.  Governing Law.  The validity, construction and effect of the Plan and
any actions taken or relating to the Plan shall be determined in accordance with
the laws of the State of Illinois and applicable federal law.

     23.  Successors and Assigns.  The Plan shall be binding on all successors
and assigns of a participant, including, without limitation, the estate of such
participant and the executor, administrator or trustee of such estate, or any
receiver or trustee in bankruptcy or representative of the participant's
creditors.

                                       A-4
<PAGE>   25

                                   APPENDIX B

                    DIAMOND TECHNOLOGY PARTNERS INCORPORATED

                       1999 EMPLOYEE STOCK PURCHASE PLAN

     The Diamond Technology Partners Incorporated 1999 Employee Stock Purchase
Plan provides eligible employees of Diamond Technology Partners Incorporated, a
Delaware corporation (the "Company"), and its Subsidiaries an opportunity to
purchase shares of Common Stock of the Company on the terms and conditions set
forth below.

     1.  Definitions.

          (a) Code -- the Internal Revenue Code of 1986, as amended.

          (b) Committee -- the Company's Management Committee, as constituted
     from time to time.

          (c) Common Stock -- the Company's Class B Common Stock, par value
     $0.001 per share, and the Company's Class A Common Stock into which such
     Class B Common Stock may be converted.

          (d) Compensation -- with respect to a Participant, the portion of the
     Participant's base salary paid to the Participant during the applicable
     payroll period.

          (e) Effective Date -- April 21, 1999.

          (f) Eligible Employee -- an employee who is eligible to participate in
     the Plan pursuant to Section 3.

          (g) Enrollment Date -- the Effective Date and each July 1, October 1,
     January 1 and April 1 thereafter.

          (h) Enrollment Period -- the 24 month period commencing on a Grant
     Date.

          (i) Fair Market Value -- the average of the closing price of a share
     of the Company's Class A Common Stock on the NASDAQ National Market System
     for the ten trading days immediately preceding the Grant Date or the
     Purchase Date, as applicable.

          (j) Grant Date -- the Enrollment Date as of which a Participant's
     Option is granted under Section 4(a).

          (k) Option -- an option to purchase shares of Common Stock under the
     Plan, pursuant to the terms and conditions thereof.

          (l) Participant -- an Eligible Employee who is participating in the
     Plan pursuant to Section 4.

          (m) Payment Period -- the period beginning with the first day of the
     calendar quarter and ending on the last day of the calendar quarter
     following each Enrollment Date; provided that the first Payment Period
     shall begin on the Effective Date and end on September 30, 1999.

          (n) Plan -- Diamond Technology Partners Incorporated 1999 Employee
     Stock Purchase Plan, as amended from time to time.

          (o) Plan Account -- an account maintained by the Plan Administrator
     for each Participant to which the Participant's payroll deductions are
     credited, against which funds used to purchase shares of Common Stock are
     charged and to which shares of Common Stock purchased are credited.

          (p) Plan Administrator -- such other person or persons, including a
     committee, as may be appointed by the Committee to administer the Plan.

          (q) Purchase Date -- except as provided in Section 15, the last day of
     a Payment Period.

          (r) Purchase Price -- the lesser of 85% of the Fair Market Value of
     Common Stock on the Grant Date of an Enrollment Period, or 85% of the Fair
     Market Value of a share of Common Stock on the applicable Purchase Date of
     such Enrollment Period.
                                       B-1
<PAGE>   26

          (o) Subsidiary -- any corporation, other than the Company, in an
     unbroken chain of corporations beginning with the Company if, at the time
     of the granting of the Option, each of the corporations other than the last
     corporation in the unbroken chain owns stock possessing 50% or more of the
     total combined voting power of all classes of stock in one of the other
     corporations in such chain.

     2.  Stock Subject to the Plan.  Subject to Section 12, the aggregate number
of shares of Common Stock which may be sold under the Plan is 600,000. The
Company shall either make open-market purchases to provide shares of Common
Stock for purchase under the Plan or, at the discretion of the Committee, sell
Treasury shares or issue authorized but unissued shares of Common Stock.

     3.  Eligible Employees.  An "Eligible Employee" means each employee of the
Company and each employee of a Subsidiary to which the Plan is extended by the
Committee, except as otherwise provided in Section 4(c).

     4.  Participation in the Plan.

          (a) An Eligible Employee may participate in the Plan effective as of
     any Enrollment Date by completing and filing with the Plan Administrator 20
     days in advance of such date (or such later date as the Plan Administrator
     shall deem equitable under the circumstances), an election form which
     authorizes payroll deductions from such Employee's Compensation. The
     Enrollment Date as of which an Eligible Employee commences or recommences
     participation in the Plan, and each Enrollment Date as of which an Eligible
     Employee renews his authorization under Section 4(b), is a Grant Date. A
     Participant's payroll deductions under the Plan shall commence on his
     initial Grant Date, and shall continue, subject to Section 4(b), until the
     Eligible Employee terminates participation in the Plan or the Plan is
     terminated; provided, that such payroll deductions shall not commence until
     the Company has received such Eligible Employee's election form and such
     Employee has received all information required to be disclosed to such
     Employee under applicable securities laws.

          (b) A Participant's payroll deduction authorization shall be
     automatically renewed effective on the Enrollment Date following the
     conclusion of his initial Enrollment Period and each subsequent Enrollment
     Period unless he otherwise notifies the Plan Administrator in writing at
     least 20 days in advance of such date.

          (c) Notwithstanding the foregoing, an Eligible Employee shall not be
     granted an Option on any Grant Date if such Employee, immediately after the
     Option is granted, owns stock possessing 5% or more of the total combined
     voting power or value of all classes of stock of the Company or any
     Subsidiary. For purposes of this paragraph, the rules of Code Section
     424(d) shall apply in determining the stock ownership of an individual, and
     stock which an Eligible Employee may purchase under outstanding options
     shall be treated as stock owned by such Employee.

     5. Payroll Deductions.  An Eligible Employee may participate in the Plan
only through payroll deductions. Payroll deductions shall be made from the
Compensation paid to each Participant for each payroll period in such whole
percentage from 1% to 10% as the Participant shall authorize in his election
form. No Eligible Employee may be granted an Option which permits his rights to
purchase Common Stock under the Plan, and any other stock purchase plan of the
Company or any Subsidiary that is qualified under Section 423 of the Code, to
accrue at a rate which exceeds $6,250 of Fair Market Value of such stock
(determined on the Grant Date of such Option) for each calendar quarter of the
Company in which the Option is outstanding at any time.

     6. Changes in Payroll Deductions.  A Participant may elect to increase or
decrease the amount of his payroll deductions once during a Payment Period by
filing a new election form at any time during that Payment Period. Any such
change shall not become effective sooner than the next Payment Period after
receipt of his election form.

     7. Termination of Participation in Plan.

          (a) A Participant may, at any time and for any reason, voluntarily
     terminate participation in the Plan by written notification of withdrawal
     delivered to the appropriate payroll office. Such Participant's
                                       B-2
<PAGE>   27

     payroll deductions under the Plan shall cease as soon as practicable
     following delivery of such notice. If the former Participant remains
     employed by the Company or any of its Subsidiaries after termination of his
     participation in the Plan, any payroll deductions credited to such
     Participant's Plan Account may be used to purchase shares of Common Stock
     on the next Purchase Date or refunded, without interest, to the
     Participant, at the election of the Participant. An Eligible Employee whose
     participation in the Plan is terminated may rejoin the Plan no earlier than
     three months following his withdrawal by filing a new election form in
     accordance with Section 4(a).

          (b) A Participant's participation in the Plan shall be terminated upon
     termination of his or her employment with the Company and its Subsidiaries
     for any reason. If a former Participant is no longer employed by the
     Company or any of its Subsidiaries, any payroll deductions credited to his
     Plan Account (plus, in the case of an involuntary termination of
     employment, interest at the rate determined by the Plan Administrator)
     shall be paid to him in cash as soon as practicable following his
     termination of employment.

     8. Purchase of Shares.

          (a) On each Grant Date, each Participant shall be deemed to have been
     granted an Option.

          (b) On each Purchase Date of an Enrollment Period, each Participant
     shall be deemed, without any further action, to have purchased that number
     of whole shares of Common Stock determined by dividing the Purchase Price
     on such date into the balance in the Participant's Plan Account on the
     Purchase Date. Any amount remaining in the Participant's Plan Account shall
     be carried forward to the next Purchase Date unless the Plan Account is
     closed.

          (c) As soon as practicable after each Purchase Date, a statement shall
     be delivered to each Participant which shall include the number of shares
     of Common Stock purchased on the Purchase Date on behalf of such
     Participant under the Plan.

          (d) A stock certificate for whole shares of Common Stock in a
     Participant's Plan Account shall be issued upon request of the Participant
     at any time. If the Participant's employment with the Company and all
     Subsidiaries terminates, a stock certificate for whole shares of Common
     Stock in his Plan Account shall be issued as soon as administratively
     feasible thereafter. Stock certificates under the Plan shall be issued, at
     the election of the Participant, in his name or in his name and the name of
     another person as joint tenants with right of survivorship or as tenants in
     common. A cash payment shall be made for any fraction of a share in such
     account, if necessary to close the account.

     9. Rights as a Stockholder.  A Participant shall not be treated as the
owner of Common Stock until the Purchase Date of such stock under the Plan. As
of the Purchase Date a Participant shall be treated as the record owner of his
shares purchased on such date pursuant to the Plan. Effective as of the Purchase
Date, such Participant shall agree in writing to become subject to the terms and
conditions of the Second Amended and Restated Voting and Stock Restriction
Agreement, dated August 4, 1997.

     10. Rights Not Transferable.  Rights under the Plan are not transferable by
a Participant other than by will or the laws of descent and distribution, and
are exercisable during the Participant's lifetime only by the Participant or by
the Participant's guardian or legal representative. No rights or payroll
deductions of a Participant shall be subject to execution, attachment, levy,
garnishment or similar process.

     11. Application of Funds.  All funds of Participants received or held by
the Company under the Plan before purchase of the shares of Common Stock shall
be held by the Company without liability for interest or other increment, except
as provided in Section 7(b).

     12. Adjustments in Case of Changes Affecting Shares.  In the event of a
subdivision or consolidation of outstanding shares of Common Stock of the
Company, or the payment of a stock dividend, the number of shares approved for
the Plan shall be increased or decreased proportionately, and such other
adjustment shall be made as may be deemed equitable by the Plan Administrator.
In the event of any other change affecting the Common Stock, such adjustment
shall be made as shall be deemed equitable by the Plan Administrator to give
proper effect to such event.
                                       B-3
<PAGE>   28

     13. Administration of the Plan.  The Plan shall be administered by the Plan
Administrator. The Plan Administrator shall have authority to make rules and
regulations for the administration of the Plan, and its interpretations and
decisions with regard to the Plan and such rules and regulations shall be final
and conclusive. It is intended that the Plan shall at all times meet the
requirements of Code Section 423, if applicable, and the Plan Administrator
shall, to the extent possible, interpret the provision of the Plan so as to
carry out such intent.

     14. Amendments to the Plan.  The Committee may, at any time, or from time
to time, amend or modify the Plan; provided, however, that no amendment shall be
made increasing or decreasing the number of shares authorized for the Plan
(other than as provided in Section 12 or 15), and that, except to conform the
Plan to the requirements of the Code, no amendment shall be made which would
cause the Plan to fail to meet the applicable requirements of Code Section 423.

     15. Termination of Plan.  The Plan shall terminate upon the earlier of (a)
the fifth anniversary of the Effective Date, (b) the date no more shares remain
to be purchased under the Plan, or (c) the termination of the Plan by the Board
of Directors of the Company as specified below. The Board of Directors of the
Company may terminate the Plan as of any date. The date of termination of the
Plan shall be deemed a Purchase Date. If on such Purchase Date Participants in
the aggregate have Options to purchase more shares of Common Stock than are
available for purchase under the Plan, each Participant shall be eligible to
purchase a reduced number of shares of Common Stock on a pro rata basis in
proportion to his Plan Account balance on such Purchase Date, and any excess
payroll deductions shall be returned to Participants, all as provided by rules
and regulations adopted by the Plan Administrator.

     16. Costs.  All costs and expenses incurred in administering the Plan shall
be paid by the Company. Any costs or expenses of selling shares of Company Stock
acquired pursuant to the Plan shall be borne by the holder thereof.

     17. Governmental Regulations.  The Company's obligation to sell and deliver
its Common Stock pursuant to the Plan is subject to the approval of any
governmental authority required in connection with the authorization, issuance
or sale of such stock.

     18. Applicable Law.  This Plan shall be interpreted under the laws of the
United States of America and, to the extent not inconsistent therewith, by the
laws of the State of Illinois. This Plan is not intended to be subject to the
Employee Retirement Income Security Act of 1974, as amended, but is intended to
comply with Section 423 of the Code, if applicable. Any provisions required to
be set forth in this Plan by such Code section are hereby included as fully as
if set forth in the Plan in full.

     19. Effect on Employment.  The provisions of this Plan shall not affect the
right of the Company or any Subsidiary or any Participant to terminate the
Participant's employment with the Company or any Subsidiary.

     20. Withholding.  The Company reserves the right to withhold from stock or
cash distributed to a Participant any amounts which it is required by law to
withhold.

     21. Sale of Company.  In the event of a proposed sale of all or
substantially all of the assets of the Company or a merger of the Company with
or into another corporation, the Company shall require that each outstanding
Option be assumed or an equivalent right to purchase stock of the successor or
purchaser corporation be substituted by the successor or purchaser corporation,
unless the Plan is terminated.

     22. Effective Date.  The Plan shall become effective April 21, 1999,
provided that the stockholders of the Company approve it within 12 months after
the date the Plan was adopted by the Board of Directors of the Company. If the
Plan is not approved by the stockholders prior to such date, the Plan shall
terminate, all grants hereunder shall be cancelled and be of no further force
and effect, and all persons who shall have been granted Options pursuant to this
Plan shall be entitled to the prompt refund in cash, with interest, of all sums
withheld from or paid by them pursuant to this Plan.

     23. Foreign Employees.  The Committee may provide for such special terms
for Participants who are foreign nationals, or who are employed by the Company
outside of the United States of America, as it may consider necessary or
appropriate to accommodate differences in local law, tax policy or custom.
                                       B-4
<PAGE>   29



July __, 1999

     IT IS IMPORTANT THAT THE PROXIES BE RETURNED PROMPTLY. STOCKHOLDERS WHO DO
NOT EXPECT TO ATTEND THE MEETING ARE URGED TO FILL OUT, DATE AND MAIL THE
ENCLOSED FORM OF PROXY IN THE ENCLOSED ENVELOPE, WHICH REQUIRES NO POSTAGE IF
MAILED IN THE UNITED STATES.


PLEASE MARK BOXES IN BLUE OR BLACK INK.

<TABLE>
<CAPTION>

1.       Election of Directors.

- ------------------------------------------------------------------------------------------------------------------
             WITHHOLD authority only for
             the nominee(s) which name(s)    WITHHOLD            Nominees are: Edward R. Anderson, Adam J.
FOR ALL      I have written to the right     authority for all   Gutstein, Mark L. Gordon and John J.
Nominees                                     nominees            Sviokia

- ------------------------------------------------------------------------------------------------------------------
<S>          <C>                             <C>                 <C>
[     ]       [             ]                 [        ]
- ------------------------------------------------------------------------------------------------------------------
</TABLE>

2.       To approve the proposed amendments to the Diamond Technology Partners
         Incorporated 1998 Equity Incentive Plan.

         FOR                   AGAINST                   ABSTAIN
         [  ]                   [ ]                       [  ]


3.       To approve the adoption of the Diamond Technology Partners
         Incorporated 1999 Employee Stock Purchase Plan.

         FOR                   AGAINST                   ABSTAIN
         [  ]                   [ ]                       [  ]


4.       To ratify the selection of KPMG LLP as the Company's independent
         auditors.


         FOR                   AGAINST                   ABSTAIN
         [  ]                   [ ]                       [  ]


5.       In their discretion, the proxies are authorized to vote upon such
         other business as may properly come before the meeting, or any
         adjournment(s) thereof.



         THIS PROXY IS SOLICITED BY THE COMPANY'S BOARD OF DIRECTORS AND, WHEN
PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED HEREIN AND IN THE
DISCRETION OF THE PROXY HOLDERS ON ALL MATTERS PROPERLY COMING BEFORE THE
MEETING. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED FOR THE ABOVE
PROPOSALS (INCLUDING ALL DIRECTOR NOMINEES).


<PAGE>   30



         Signatures(s) should be exactly as name or names appearing on this
proxy, if shares are held jointly, each holder should sign. If signing is by
attorney, executor, administrator, trustee or guardian, please give full title.

                                              Dated: _______________, 1999


                                              -----------------------------
                                              Signature(s)


                                              -----------------------------
                                              Signature(s)


SIGN, DATE AND RETURN THE PROXY CARD PROMPTLY USING THE ENCLOSED ENVELOPE

- -------------------------------------------------------------------------------
                             [FOLD AND DETACH HERE]
                    DIAMOND TECHNOLOGY PARTNERS INCORPORATED




<PAGE>   31


                              CLASS A COMMON STOCK

         The undersigned stockholder of Diamond Technology Partners
Incorporated (the "Company") hereby appoints Melvyn E. Bergstein and Michael E.
Mikolajczyk and each of them, the attorneys and proxies of the undersigned,
with full power of substitution, to vote, as directed on the reverse side of
this card, all of the shares of Class A Common Stock of the Company standing in
the name of the undersigned at the close of business on June 29, 1999 at the
Annual Meeting of Stockholders to be held at The John Hancock Center, 95th
Floor, Chicago Room, 875 North Michigan Avenue, Chicago, Illinois, commencing
at 10:00 a.m. (CDT) on Tuesday, August 10, 1999, and at any and all
adjournments thereof, and authorizes each proxy to vote at his discretion on
any other matter that may properly come before the meeting or at any and all
adjournments thereof.





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