MEDIAPLEX INC
DEF 14A, 2000-05-11
BUSINESS SERVICES, NEC
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<PAGE>

                                 SCHEDULE 14A

                  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 Rule
    14a6(e)(2))
[X] Definitive Proxy Statement
[ ] Definitive Additional Materials
[ ] Soliciting Material Pursuant to Section 240.14a11(c) or Section 240.14a12


                                Mediaplex, Inc.
                                ---------------

                (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 14a6(i)(1) and 011.
    (1)   Title of each class of securities to which transaction applies:
          N/A
          ----------------------------------------------------------------------
    (2)   Aggregate number of securities to which transaction applies:
          N/A
          ----------------------------------------------------------------------
    (3)   Per unit price or other underlying value of transaction computed
          pursuant to Exchange Act Rule 011 (Set forth the amount on which the
          filing fee is calculated and state how it was determined):
          N/A
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    (4)   Proposed maximum aggregate value of transaction:
          N/A
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    (5)   Total fee paid:
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[ ] Fee paid previously with preliminary materials.
[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule
    011(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:
          N/A
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    (2)   Form, Schedule or Registration Statement No.:
          N/A
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    (3)   Filing Party:
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    (4)   Date Filed:
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<PAGE>

                                MEDIAPLEX, INC.

                   NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                             FRIDAY, JUNE 9, 2000
                                 AT 10:00 A.M.

TO OUR STOCKHOLDERS:

  NOTICE IS HEREBY GIVEN that the 2000 Annual Meeting of Stockholders of
Mediaplex, Inc., a Delaware corporation, will be held on Friday, June 9, 2000
at 10:00 a.m., local time, at Mediaplex's principal offices, at 177 Steuart
Street, San Francisco, California 94105, for the following purposes:

  1. To elect two Class I directors to serve for a term of three years and
     until their successors are duly elected and qualified;

  2. To ratify and approve amendments to our Amended and Restated 1999 Stock
     Plan to: (i) increase the number of shares reserved for issuance
     thereunder by 1,000,000 shares and (ii) provide for a higher annual
     increase, to be added on the first day of the fiscal year commencing in
     2001, equal to the lesser of: (a) 2,500,000 shares, (b) 5% of the
     outstanding shares of our capital stock, or (c) such lesser amount as
     may be determined by our board of directors.

  3. To ratify the appointment of PricewaterhouseCoopers LLP as our
     independent accountants for the fiscal year ending December 31, 2000;
     and

  4. To transact such other business as may properly come before the meeting
     or at any and all its continuations or adjournments.

  The foregoing items of business are more fully described in the proxy
statement accompanying this notice.

  Only stockholders of record at the close of business on April 30, 2000 are
entitled to receive notice of, to attend and to vote at the meeting and any
adjournment thereof. You are all cordially invited to attend the meeting in
person. If you attend the meeting, you may vote in person even if you already
returned a proxy.

                                       FOR THE BOARD OF DIRECTORS
                                       Gregory R. Raifman
                                       Chairman and Chief Executive Officer

San Francisco, California
May 11, 2000

IMPORTANT: WHETHER OR NOT YOU EXPECT TO ATTEND THE MEETING, PLEASE COMPLETE,
DATE AND SIGN THE ENCLOSED PROXY AND MAIL IT PROMPTLY IN THE ENCLOSED ENVELOPE
IN ORDER TO ENSURE REPRESENTATION OF YOUR SHARES. NO POSTAGE NEED BE AFFIXED
IF MAILED IN THE UNITED STATES.
<PAGE>

              PROXY STATEMENT FOR ANNUAL MEETING OF STOCKHOLDERS

  The enclosed proxy is solicited on behalf of the board of directors of
Mediaplex, Inc. for use at our 2000 Annual Meeting of Stockholders to be held
on Friday, June 9, 2000, at 10:00 a.m., local time, or at any and all
continuations or adjournments, for the purposes described in this proxy
statement and in the accompanying notice. The annual meeting will be held at
our principal offices, at 177 Steuart Street, San Francisco, California 94105.
Our telephone number there is (415) 808-1900.

  These proxy solicitation materials were mailed on or about May 11, 2000 to
all stockholders entitled to vote at the annual meeting.

                INFORMATION CONCERNING SOLICITATION AND VOTING

PURPOSES OF THE ANNUAL MEETING

  The purposes of the annual meeting are:

  1. to elect two Class I directors to serve for a term of three years and
     until their successors are duly elected and qualified;

  2. to ratify and approve amendments to our Amended and Restated 1999 Stock
     Plan to increase the number of shares reserved for issuance thereunder
     by 1,000,000 shares and to provide for a higher annual increase, to be
     added on the first day of the fiscal year commencing in 2001, equal to
     the lesser of: (a) 2,500,000 shares, (b) 5% of the outstanding shares of
     our capital stock, or (c) such lesser amount as may be determined by our
     board of directors;

  3. to ratify the appointment of PricewaterhouseCoopers LLP as our
     independent accountants for the fiscal year ending December 31, 2000;
     and

  4. to transact such other business as may properly come before the meeting
     or at any and all continuations or adjournments.

RECORD DATE AND SHARES OUTSTANDING

  Stockholders of record at the close of business on the record date, April
30, 2000, are entitled to notice of, and to vote at, the annual meeting. At
the record date, 32,987,886 shares of our common stock were issued and
outstanding. For information regarding security ownership by management and 5%
stockholders, see "Security Ownership of Certain Beneficial Owners and
Management." The closing price of our common stock on The Nasdaq Stock Market
on the last trading day immediately prior to the record date was $51.25 per
share.

REVOCABILITY OF PROXIES

  The proxy accompanying this proxy statement is solicited on behalf of the
Mediaplex board of directors for use at the annual meeting. Please complete,
date and sign the accompanying proxy and return in the enclosed envelope. Any
proxy you submit pursuant to this solicitation may be revoked by you at any
time before its use by:

  .delivering to our corporate secretary a written notice of revocation, or

  .by delivering to our corporate secretary a duly executed proxy bearing a
  later date, or

  .by attending the annual meeting and voting in person.

Attending the annual meeting is not sufficient to revoke your proxy.

VOTING AND SOLICITATION

  For each share of common stock you hold on the record date, you will be
entitled to one vote on all matters. The two candidates for election as
directors at the annual meeting who receive a plurality of the shares of our

                                       1
<PAGE>

outstanding common stock present or represented at the annual meeting will be
elected. The ratification and approval of amendments to our stock plan, and
the ratification of the appointment of PricewaterhouseCoopers LLP, will each
require the affirmative vote of a majority of the shares of our outstanding
common stock present or represented at the annual meeting.

  Shares of common stock represented by properly executed proxies will, unless
those proxies have been previously revoked, be voted in accordance with the
instructions indicated. In the absence of specific instructions to the
contrary, properly executed proxies will be voted:

  1. "FOR" the election of each of our two nominees as a director;

  2. "FOR" ratification and approval of amendments to our stock plan; and

  3. "FOR" ratification of the appointment of PricewaterhouseCoopers LLP as
     our independent accountants for the fiscal year ending December 31,
     2000.

  No business other than that set forth in the accompanying notice is expected
to come before the annual meeting. Should any other matter requiring a vote of
stockholders properly arise, the persons named in the enclosed proxy will vote
such proxy as our board of directors may recommend.

  The cost of this solicitation will be borne by Mediaplex. We may reimburse
brokerage firms and other persons representing beneficial owners of shares for
their expenses in forwarding solicitation material to such beneficial owners.
Proxies may also be solicited by certain of our directors, officers and
regular employees, without additional compensation other than reimbursement of
expenses, personally or by telephone, telegram or letter.

QUORUM; ABSTENTIONS; BROKER NON-VOTES

  The required quorum for the transaction of business at the annual meeting is
a majority of the shares of common stock outstanding on the record date.
Shares that are voted "FOR" or "AGAINST" a matter are treated as being present
at the annual meeting for purposes of establishing a quorum and are also
treated as shares "represented and voting" at the annual meeting, that is,
"votes cast," with respect to such matter.

  Under Delaware corporate law, an abstaining vote and a broker non-vote are
counted as present and entitled to vote and are, therefore, included for
purposes of determining whether a quorum of shares is present at a meeting;
however, such votes are not considered votes cast. As a result, abstentions
and broker non-votes are not included in the tabulation of the voting results
on the election of directors or issues requiring approval of a majority of the
votes cast and, therefore, do not have the effect of votes in opposition in
such tabulations. A broker non-vote occurs when a nominee holding shares for a
beneficial owner does not vote on a particular proposal because the nominee
does not have discretionary voting power with respect to that item and has not
received instructions from the beneficial owner.

DEADLINE FOR RECEIPT OF STOCKHOLDER PROPOSALS

  Proposals of our stockholders that are intended to be presented by such
stockholders at our 2001 annual meeting of stockholders must be received by
Mediaplex at its corporate offices, no later than January 12, 2001 in order to
be considered for possible inclusion in the proxy statement and form of proxy
relating to the 2001 annual meeting. If a stockholder intends to submit a
proposal at the 2001 annual meeting of stockholders which is not submitted in
time to be eligible for inclusion in the proxy statement relating to that
meeting, the stockholder must give notice to Mediaplex no earlier than March
11, 2001 and no later than March 31, 2001, in accordance with the requirements
set forth in the Securities Exchange Act of 1934 and our bylaws. However, in
the event that the 2001 annual meeting of stockholders is held either before
May 20, 2001 or after August 18, 2001, then the stockholder must give notice
to Mediaplex no earlier than 90 days prior to the meeting date and no later
than 70 days prior to the meeting date. If a stockholder fails to comply with
the foregoing notice provisions, the proposal may not be brought before the
meeting.

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<PAGE>

                                PROPOSAL NO. 1

                             ELECTION OF DIRECTORS

DIRECTORS

  Our board of directors is currently comprised of six members, divided into
three classes with overlapping three-year terms. Any additional directorships
resulting from an increase in the number of directors will be distributed
among the three classes so that, as nearly as possible, each class will
consist of an equal number of directors. Unless otherwise instructed, the
proxy holders will vote the proxies received by them for our two nominees
named below, both of whom currently serve as our directors. In the event that
additional persons are nominated for election as directors, the proxy holders
intend to vote all proxies received by them in such a manner as will ensure
the election of as many of the nominees listed below as possible.

NOMINEES FOR CLASS I DIRECTORS

  Two Class I directors are to be elected at the annual meeting for a three-
year term ending in 2003. Our board of directors has nominated LAWRENCE D.
LENIHAN, JR. and PETER S. SEALEY for reelection as Class I directors. Unless
otherwise instructed, the persons named in the enclosed proxy intend to vote
proxies received by them for the reelection of Messrs. Lenihan and Sealey. We
expect that Messrs. Lenihan and Sealey will accept such nomination. In the
event that either Mr. Lenihan or Mr. Sealey is unable or declines to serve as
a director at the time of the annual meeting, proxies will be voted for a
substitute nominee or nominees designated by the current board of directors.
The term of office of the persons elected as directors will continue until
such director's term expires in 2003 or until such director's successor has
been elected and qualified.

REQUIRED VOTE

  The two nominees receiving the highest number of affirmative votes of the
shares present or represented and entitled to be voted for them shall be
elected as directors. Votes withheld from any director are counted for
purposes of determining the presence or absence of a quorum for the
transaction of business, but have no other legal effect in the election of
directors under Delaware law.

RECOMMENDATION OF THE BOARD OF DIRECTORS

  THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE "FOR" EACH OF THE
NOMINEES LISTED ABOVE.

INFORMATION REGARDING NOMINEES AND OTHER DIRECTORS

  Set forth below is certain information as of the record date regarding the
nominees for Class I directors and each of our other directors whose term of
office continues after this annual meeting.

          NOMINEES FOR CLASS I DIRECTORS FOR A TERM EXPIRING IN 2003

<TABLE>
<CAPTION>
      NAME                                                          AGE POSITION
      ----                                                          --- --------
      <S>                                                           <C> <C>
      Lawrence D. Lenihan, Jr......................................  35 Director
      Peter S. Sealey..............................................  59 Director
</TABLE>

  LAWRENCE D. LENIHAN, JR. has served as a member of our board of directors
since August 1999. Since January 1999, Mr. Lenihan has served as a fund
manager for Pequot Capital Management, Inc., an investment firm. From October
1996 to December 1998, Mr. Lenihan served as a fund manager for Dawson-Samberg
Capital Management, the predecessor firm to Pequot Capital Management, Inc.
From August 1993 to October 1996, Mr. Lenihan served as a principal for
Broadview Associates, an investment bank. Mr. Lenihan also serves as a member
of the boards of directors of Digital Generation Systems, Inc., a provider of
distribution services for ad

                                       3
<PAGE>

agencies and broadcasters, as well as several private companies. Mr. Lenihan
received a B.S.E.E. in electrical engineering from Duke University and an
M.B.A. from the Wharton School of Business at the University of Pennsylvania.

  PETER S. SEALEY has served as a member of our board of directors since
August 1999. Since September 1994, Dr. Sealey has served as an adjunct
professor of marketing at the Haas School of Business at the University of
California, Berkeley where he also has served as a co-director of the Center
for Marketing and Technology. Prior to that, Dr. Sealey was employed by the
Coca Cola Company for 24 years, where he held a series of senior management
positions, including senior vice president, global marketing. Dr. Sealey
serves as a member of the boards of directors of Autoweb.com Inc., a consumer
automotive Internet site, L90, a producer of Internet advertising and direct
marketing solutions for advertisers and web publishers, and Cybergold, Inc.,
an Internet-based direct marketing and advertising company, as well as several
private companies. Dr. Sealey received a B.S.B.A. in business from the
University of Florida, an M.I.A. in industrial administration from Yale
University, and an M.A. in management and Ph.D. in management and information
technology from the Peter F. Drucker Graduate Management Center at The
Claremont Graduate University.

            INCUMBENT CLASS II DIRECTORS WHOSE TERM EXPIRES IN 2001

<TABLE>
<CAPTION>
      NAME                                            AGE POSITION
      ----                                            --- --------
      <S>                                             <C> <C>
      Jon L. Edwards.................................  40 President and Director
      James DeSorrento...............................  57 Director
</TABLE>

  JON L. EDWARDS has served as our President and a member of our board of
directors since April 1998. Since August 1993, Mr. Edwards has also served as
a general partner of Raifman & Edwards LLP. Since September 1994, Mr. Edwards
has also served as a managing member of PointBreak Ventures, LLC. Mr. Edwards
received an A.B. in engineering science from Dartmouth College and a J.D. from
Georgetown University Law Center.

  JAMES DESORRENTO has served as a member of our board of directors since
August 1999. From June 1982 until its acquisition by Mediacom LLC in May 1999,
Mr. DeSorrento served as chief executive officer and chairman of the board of
Triax Telecommunications Company, LLC and its predecessor, Triax
Communications Corporation, a cable television operating company. Mr.
DeSorrento received a B.A. in English from St. Michael's College.

           INCUMBENT CLASS III DIRECTORS WHOSE TERM EXPIRES IN 2002

<TABLE>
<CAPTION>
      NAME                              AGE POSITION
      ----                              --- --------
      <S>                               <C> <C>
      Gregory R. Raifman...............  40 Chairman and Chief Executive Officer
      A. Brooke Seawell................  52 Director
</TABLE>

  GREGORY R. RAIFMAN has served as our Chairman of the Board of Directors and
Chief Executive Officer since September 1998, and Chief Executive Officer and
sole director of MediaPlex, Inc., its former wholly-owned subsidiary, since
April 1998. Since August 1993, Mr. Raifman has also served as a general
partner of Raifman & Edwards LLP, a law firm. Since September 1994, Mr.
Raifman has also served as a managing member of PointBreak Ventures, LLC, a
venture capital firm. Mr. Raifman received an A.B. in economics and history
from the University of Michigan and a J.D. from Georgetown University Law
Center.

  A. BROOKE SEAWELL has served as a member of our board of directors since
August 1999. Since February 2000, Mr. Seawell has been a general partner of
Technology Crossover Ventures, a venture capital firm. From April 1997 to
September 1998, Mr. Seawell served as executive vice president of NetDynamics
Inc., a business network applications server software company. From March 1991
to April 1997, Mr. Seawell served as the senior vice president of finance and
operations of Synopsys Inc., an electronic design automation company. Mr.
Seawell serves as a member of the boards of directors of NVIDIA Corporation, a
three-dimensional graphics processor

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<PAGE>

company, Informatica Corporation, a data integration software company, and
Accrue Software, Inc., an internet data collection and analysis software
company, as well as several private companies. Mr. Seawell received a B.A. in
economics and an M.B.A. in finance from Stanford University

CLASSIFIED BOARD

  Our certificate of incorporation provides for a classified board of
directors consisting of three classes of directors, each serving staggered
three-year terms. As a result, a portion of our board of directors will be
elected each year. To implement the classified structure, two of the nominees
to the board have been elected to one-year terms, two elected to two-year
terms and three have been elected to three-year terms. Thereafter, directors
will be elected for three-year terms.

  .  Lawrence D. Lenihan, Jr. and Peter S. Sealey have been designated Class
     I directors whose terms expire at this annual meeting of stockholders.

  .  Jon L. Edwards and James DeSorrento have been designated Class II
     directors whose terms expire at the 2001 annual meeting of stockholders.

  .  Gregory R. Raifman and A. Brooke Seawell have been designated Class III
     directors whose terms expire at the 2002 annual meeting of stockholders.

  Executive officers are appointed by the board of directors on an annual
basis and serve until their successors have been duly elected and qualified.
Gregory R. Raifman, our Chairman of the Board of Directors and Chief Executive
Officer, is the brother of Alan M. Raifman, our Vice President, Business and
Legal Affairs. Jon Edwards, our President, is the brother of Michael Edwards,
our Vice President, Business Development. There are otherwise no family
relationships among any of our directors, officers or key employees.

BOARD MEETINGS AND COMMITTEES

  Our board of directors held a total of four meetings during the fiscal year
December 31, 1999. All incumbent directors who served as a director during the
last fiscal year attended no less than 75% of the aggregate of all meetings of
the board of directors and any committees of the board on which he served, if
any, during the last fiscal year. Our board of directors has an audit
committee and a compensation committee, but does not have a nominating
committee or a committee performing the functions of a nominating committee.

  We established the audit committee in August 1999. The audit committee
currently consists of Messrs. DeSorrento and Seawell. During the four months
in which the audit committee was in existence in fiscal 1999, the audit
committee held one meeting. The audit committee reviews our internal
accounting procedures and consults with and reviews the services provided by
our independent accountants.

  We established the compensation committee in August 1999. The compensation
committee currently consists of Messrs. Lenihan and Sealey. No meetings were
held during the four months in which the compensation committee was in
existence in fiscal 1999. The compensation committee reviews and recommends to
our board of directors the compensation and benefits of our employees.

DIRECTOR COMPENSATION

  Our directors do not currently receive any cash compensation from us for
their service as members of the board of directors; however, directors are
reimbursed for all reasonable expenses incurred by them in attending board and
committee meetings. Employee and non-employee directors are also eligible to
receive options under our stock plan and employee directors are eligible to
participate in our employee stock purchase plan. In August 1999, Messrs.
DeSorrento and Seawell and Dr. Sealey were each granted an option to acquire
50,000 shares of common stock at an exercise price of $3.25 per share upon
their appointment to our board of directors. The options vest over a four-year
period but may be exercised at any time. Messrs. DeSorrento and Seawell
exercised their options, subject to repurchase, in August 1999.

                                       5
<PAGE>

                                PROPOSAL NO. 2

                     PROPOSAL TO APPROVE AMENDMENTS TO THE
                     AMENDED AND RESTATED 1999 STOCK PLAN

AMENDED AND RESTATED 1999 STOCK PLAN

  Our Amended and Restated 1999 Stock Plan was initially adopted by our board
of directors and shareholders in February 1999. Our board of directors amended
and restated the stock plan in August 1999, and our stockholders approved the
stock plan, as amended and restated, in September 1999. Unless terminated
sooner, the stock plan will automatically terminate on November 19, 2009. The
stock plan provides for the grant of incentive stock options to employees,
including our officers and employee directors, and for the grant of
nonstatutory stock options and stock purchase rights to our employees,
directors and consultants.

  We initially reserved 12,000,000 shares of our common stock for issuance
pursuant to the stock plan. The stock plan currently provides for annual
increases of the number of shares reserved for issuance thereunder by an
amount equal to the lesser of: (a) 1,000,000 shares, (b) 4% of the outstanding
shares or (c) an amount determined by our board of directors. On January 1,
2000, the number of shares reserved for issuance was automatically increased
by 400,000 shares. As a result, as of the record date, 12,400,000 shares of
our common stock were reserved for issuance.

AMENDMENTS TO AMENDED AND RESTATED 1999 STOCK PLAN

  In March 2000, our board of directors approved amendments to the stock plan
to (i) reserve an additional 1,000,000 shares of our common stock for issuance
thereunder and (ii) provide for a higher annual increase, to be added on the
first day of the fiscal year commencing in 2001, equal to the lesser of (a)
2,500,000 shares, (b) 5% of the outstanding shares of our capital stock, or
(c) such lesser amount as may be determined by our board of directors. At the
annual meeting, you will be requested to ratify and approve the amendments. We
believe that the availability of stock options will allow us to attract and
retain the most qualified employees, officers and directors. As of the record
date, options or rights to purchase an aggregate of 9,248,595 shares of our
common stock, having a weighted average exercise price of $9.07 per share,
were outstanding under the stock plan.

REQUIRED VOTE

  The affirmative vote of the holders of a majority of the votes cast is
required to ratify and approve the amendments to the Amended and Restated 1999
Stock Plan.

RECOMMENDATION OF THE BOARD OF DIRECTORS

  THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE "FOR" THE AMENDMENTS TO
THE AMENDED AND RESTATED 1999 STOCK PLAN.

DESCRIPTION OF STOCK PLAN

  Our stock plan is attached this proxy statement as Annex A, and this
description incorporates by reference the stock plan. The essential terms of
the stock plan, as proposed to be amended, are as follows:

 PURPOSE

  The purpose of the stock plan is to attract and retain the best available
personnel for positions of substantial responsibility, to provide additional
incentive to employees, directors and consultants, and to promote the success
of our business. The stock plan will continue in effect for a term of ten
years until November 2009 unless terminated earlier pursuant to the terms of
the stock plan.

                                       6
<PAGE>

 STOCK SUBJECT TO THE STOCK PLAN

  The maximum aggregate number of shares of common stock that may be granted
under the stock plan is 12,000,000 shares, plus an annual increase to be added
on the first day of the fiscal year beginning in 2000 equal to the least of
(i) 1,000,000 shares, (ii) 4% of the outstanding shares on such date or (iii)
an amount determined by the board. The shares may be authorized, but unissued,
or reacquired common stock. If an option or stock purchase right expires or
becomes unexercisable without having been exercised in full, or is surrendered
pursuant to an option exchange program, the unexercised shares that were
subject thereto will become available for future grant or sale under the stock
option plan.

 ADMINISTRATION

  The stock plan is administered by an administrator, which can be either our
board of directors and/or the compensation committee of our board of
directors. Subject to the provisions of the stock plan, the administrator has
the authority, in its discretion:

  .  to determine the fair market value of our common stock;

  .  to select the employees, directors or consultants to whom options and
     stock purchase rights may be granted under the stock plan;

  .  to determine the number of shares of common stock to be covered by each
     option and stock purchase right granted under the stock plan;

  .  to approve forms of agreement for use under the stock plan;

  .  to determine the terms and conditions of any option or stock purchase
     right granted under the stock plan such as the exercise price, the time
     or times when options or stock purchase rights may be exercised (which
     may be based on performance criteria), any vesting acceleration or
     waiver of forfeiture restrictions;

  .  to reduce the exercise price of any option or stock purchase right to
     the then current fair market value;

  .  to institute an option exchange program;

  .  to construe and interpret the terms of the stock plan and awards granted
     pursuant to the stock plan;

  .  to prescribe, amend and rescind rules and regulations relating to the
     stock plan;

  .  to modify or amend each option or stock purchase right;

  .  to allow optionees to satisfy withholding tax obligations by electing to
     have us withhold from the shares to be issued upon exercise of an option
     or stock purchase right that number of shares having a fair market value
     equal to the amount required to be withheld;

  .  to authorize any person to execute on behalf of us any instrument
     required to effect the grant of an option or stock purchase right
     previously granted by the administrator; and

  .  to make all other determinations deemed necessary or advisable for
     administering the stock plan.

 ELIGIBILITY

  All employees, directors and consultants are eligible to participate in the
stock plan. Stock options intended to qualify as an incentive stock option
within the meaning of Section 422 of the Internal Revenue Code may be granted
only to employees. Nonstatutory stock options, which are options not intended
to qualify as incentive stock options, and stock purchase rights may be
granted to our employees, directors and consultants. No optionee may be
granted, in any fiscal year, options to purchase more than 500,000 shares;
provided that, in connection with his or her initial service, an optionee may
be granted options to purchase up to an additional 500,000 shares that shall
not count against such limit.

                                       7
<PAGE>

 TERMS AND CONDITIONS OF OPTIONS

  Each option granted pursuant to the stock plan is evidenced by a written
stock option agreement between the optionee and us and is subject to the
following terms and conditions:

  Term of Option. The term of each option is stated in each option agreement.
In the case of an incentive stock option, the term is ten years from the date
of grant or such shorter terms as may be provided in the option agreement. In
the case of an incentive stock option granted to an optionee who, at the time
the incentive stock option is granted, owns stock representing more than ten
percent of the total combined voting power of all classes of our stock or any
parent or subsidiary, the term of the incentive stock option is five years
from the date of grant or such shorter term as may be provided in the option
agreement.

  Exercise Price.  The per share exercise price for the shares to be issued
pursuant to the exercise of an option is determined by the administrator,
subject to the following:

  .  in the case of an incentive stock option (A) granted to an employee who,
     at the time the incentive stock option is granted, owns stock
     representing more than ten percent of the voting power of all classes of
     our stock or any parent or subsidiary, the per share exercise price may
     be no less than 110% of the fair market value per share on the date of
     grant and (B) granted to any employee other than an employee described
     in (A) immediately preceding, the per share exercise price may be no
     less than 100% of the fair market value per share on the date of grant;

  .  in the case of a nonstatutory stock option, the per share exercise price
     may be determined by the administrator; and

  .  in the case of a nonstatutory stock option intended to qualify as
     "performance-based compensation" within the meaning of Section 162(m) of
     the Internal Revenue Code, the per share exercise price may be no less
     than 100% of the fair market value per share on the date of grant.

  Notwithstanding the foregoing, options may be granted with a per share
exercise price of less than 100% of the fair market value per share on the
date of grant pursuant to a merger or other corporate transaction.

  Waiting Period and Exercise Dates. At the time an option is granted, the
administrator fixes the period within which the option may be exercised and
determines any conditions that must be satisfied before the option may be
exercised.

  Form of Consideration. The administrator determines the acceptable form of
consideration for exercising an option, including the method of payment. In
the case of an incentive stock option, the administrator determines the
acceptable form of consideration at the time of grant. Such consideration may
consist entirely of cash, check, promissory note, other shares that (a) in the
case of shares acquired upon exercise of an option, have been owned by the
optionee for more than six months on the date of surrender, and (b) have a
fair market value on the date of surrender equal to the aggregate exercise
price of the shares as to which such option is exercised, consideration
received by us under a cashless exercise program implemented by us in
connection with the stock plan, a reduction in the amount of any liability
payable by us to the optionee, including any liability attributable to the
optionee's participation in any of our sponsored deferred compensation
programs or arrangements, any combination of the foregoing methods of payment,
or any other consideration and method of payment for the issuance of shares to
the extent permitted by applicable laws.

  Exercise of Option. Any option granted under the stock plan is exercisable
according to the terms of the stock plan and at such times and under such
conditions as determined by the administrator and set forth in the option
agreement. Unless the administrator provides otherwise, vesting of options
granted under the stock plan are tolled during any paid leave absence that
exceeds 90 days.

  Termination of Relationship as a Service Provider. If an optionee ceases to
be an employee or consultant, other than upon the optionee's death or
disability, the optionee may exercise his or her option within such period of
time as is specified in the option agreement to the extent that the option is
vested on the date of termination

                                       8
<PAGE>

(but in no event later than the expiration of the term of such option as set
forth in the option agreement). In the absence of a specified time in the
option agreement, the option remains exercisable for three months following
the optionee's termination. If, on the date of termination, the optionee is
not vested as to his or her entire option, the shares covered by the unvested
portion of the option revert to the stock plan. If, after termination, the
optionee does not exercise his or her option within the time specified by the
administrator, the option terminates, and the shares covered by such option
revert to the stock plan.

  Disability of Optionee. If an optionee ceases to be an employee or
consultant as a result of the optionee's disability, the optionee may exercise
his or her option within such period of time as is specified in the option
agreement to the extent the option is vested on the date of termination (but
in no event later than the expiration of the term of such option as set forth
in the option agreement). In the absence of a specified time in the option
agreement, the option will remain exercisable for twelve months following the
optionee's termination. If, on the date of termination, the optionee is not
vested as to his or her entire option, the shares covered by the unvested
portion of the option revert to the stock option plan. If, after termination,
the optionee does not exercise his or her option within the time specified
herein, the option will terminate, and the shares covered by such option
revert to the stock plan.

  Death of Optionee. If an optionee dies while he or she is our employee,
director or consultant, the option may be exercised within such period of time
as is specified in the option agreement (but in no event later than the
expiration of the term of such option as set forth in the option agreement),
by the optionee's estate or by a person who acquires the right to exercise the
option by bequest or inheritance, but only to the extent that the option is
vested on the date of death. In the absence of a specified time in the option
agreement, the option will remain exercisable for twelve months following the
optionee's termination. If, at the time of death, the optionee is not vested
as to his or her entire option, the shares covered by the unvested portion of
the option will revert to the stock plan. The option may be exercised by the
executor or administrator of the optionee's estate or, if none, by the person
or persons entitled to exercise the option under the optionee's will or the
laws of descent or distribution. If the option is not so exercised within the
time specified, the option terminates, and the shares covered by such option
revert to the stock plan.

 STOCK PURCHASE RIGHTS

  Rights to Purchase. Stock purchase rights may be issued either alone, in
addition to, or in tandem with other awards granted under the stock plan
and/or cash awards made outside of the stock plan. After the administrator
determines that it will offer stock purchase rights under the stock plan, it
will advise the offeree in writing or electronically, by means of a notice of
grant, of the terms, conditions and restrictions related at the offer,
including the number of shares that the offeree will be entitled to purchase,
the price to be paid, and the time within which the offeree must accept such
offer. The offer will be accepted by execution of a restricted stock purchase
agreement in the form determined by the administrator.

  Repurchase Option. Unless the administrator determines otherwise, the
restricted stock purchase agreement will grant us a repurchase option
exercisable upon the voluntary or involuntary termination of the purchaser's
service with us for any reason (including death or disability). The purchase
price for shares repurchased pursuant to the restricted stock purchase
agreement will be the original price paid by the purchaser and may be paid by
cancellation of any indebtedness of the purchaser to us. The repurchase option
will lapse at a rate determined by the administrator.

  Other Provisions. The restricted stock purchase agreement will contain such
other terms, provisions and conditions not inconsistent with the stock option
plan as may be determined by the administrator in its sole discretion.

  Rights as a Stockholder. Once the stock purchase right is exercised, the
purchaser will have the rights equivalent to those of a stockholder, and will
be a stockholder when his or her purchase is entered upon the records of our
duly authorized transfer agent.

                                       9
<PAGE>

 NON-TRANSFERABILITY OF OPTIONS AND STOCK PURCHASE RIGHTS

  An option or stock purchase right may not be sold, pledged, assigned,
hypothecated, transferred, or disposed of in any manner other than by will or
by the laws of descent or distribution and may be exercised, during the
lifetime of the optionee, only by the optionee.

 ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, DISSOLUTION, MERGER OR ASSET SALE

  Changes in Capitalization. Subject to any required action by our
stockholders, the number of shares of common stock covered by each outstanding
option and stock purchase right, and the number of shares of common stock that
have been authorized for issuance under the plan but as to which no options or
stock purchase rights have yet been granted or that have been returned to the
stock option plan upon cancellation or expiration of an option or stock
purchase right, as well as the price per share of common stock covered by each
such outstanding option or stock purchase right, will be proportionately
adjusted for any increase or decrease in the number of issued shares of common
stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the common stock, or any other increase or
decrease in the number of issued shares of common stock effected without
receipt of consideration by us.

  Dissolution or Liquidation. In the event of our proposed dissolution or
liquidation, the administrator will notify each optionee as soon as
practicable prior to the effective date of such proposed transaction.
The administrator in its discretion may provide for an optionee to have the
right to exercise his or her option until ten days prior to such transaction
as to all of the optioned stock covered thereby, including shares as to which
the option would not otherwise be exercisable. In addition, the administrator
may provide that any of our repurchase options applicable to any shares
purchased upon exercise of an option or stock purchase right will lapse as to
all such shares, provided the proposed dissolution or liquidation take place
at the time and in the manner contemplated. To the extent it has not been
previously exercised, an option or stock purchase right will terminate
immediately prior to the consummation of such proposed action.

  Merger of Asset Sale. In the event of our merger with or into another
corporation, or the sale of substantially all of our assets, each outstanding
option and stock purchase right will be assumed or an equivalent option or
right substituted by the successor corporation or a parent or subsidiary of
the successor corporation. In the event that the successor corporation refuses
to assume or substitute for the option or stock purchase right, the optionee
will fully vest in and have the right to exercise the option or stock purchase
right as to all of the optioned stock, including shares as to which it would
not otherwise be vested or exercisable. If an option or stock repurchase right
becomes fully vested and exercisable in lieu of assumption or substitution in
the event of a merger or sale of assets, the administrator will notify the
optionee in writing or electronically that the option or stock purchase right
shall be fully vested and exercisable for a period of fifteen days from the
date of such notice, and the option or stock purchase right shall terminate
upon the expiration of such period.

 AMENDMENT AND TERMINATION OF THE STOCK PLAN

  Our board of directors may at any time amend, alter, suspend or terminate
the stock plan; provided that we are required to obtain stockholder approval
of any stock plan amendment to the extent necessary and desirable to comply
with applicable laws.

 FEDERAL INCOME TAX CONSEQUENCES

  Incentive Stock Options. An optionee who is granted an incentive stock
option does not recognize taxable income at the time the option is granted or
upon its exercise, although the exercise may subject the optionee to the
alternative minimum tax. Upon a disposition of the shares more than two years
after grant of the option and one year after exercise of the option, any gain
or loss is treated as long-term capital gain or loss. If these holding periods
are not satisfied, irrespective of any election made under section 83(b) of
the Internal Revenue Code, the optionee recognizes ordinary income at the time
of disposition equal to the difference between the exercise price

                                      10
<PAGE>

and the lower of (i) the fair market value of the shares at the date of the
option exercise or (ii) the sale price of the shares. Any gain or loss
recognized on such a premature disposition of the shares in excess of the
amount treated as ordinary income is treated as long-term or short-term
capital gain or loss, depending on the holding period. A different rule for
measuring ordinary income upon such a premature disposition may apply if the
optionee is also one of our officers, directors, or 10% stockholders. We are
entitled to a deduction in the same amount as the ordinary income recognized
by the optionee.

  Nonstatutory Stock Options. An optionee does not recognize any taxable
income at the time he or she is granted a nonstatutory stock option. Upon
exercise, the optionee recognizes taxable income generally measured by the
excess of the then fair market value of the shares over the exercise price.
Any taxable income recognized in connection with an option exercise by one of
our employees is subject to tax withholding by us. We are entitled to a
deduction in the same amount as the ordinary income recognized by the
optionee. Upon a disposition of such shares by the optionee, any difference
between the sale price and the optionee's exercise price, to the extent not
recognized as taxable income as provided above, is treated as long-term or
short-term capital gain or loss, depending on the holding period.

  Stock Purchase Rights. Stock purchase rights will generally be taxed in the
same manner as nonstatutory stock options. However, restricted stock is
generally purchased upon the exercise of a stock purchase right. At the time
of purchase, restricted stock is subject to a "substantial risk of forfeiture"
within the meaning of Section 83 of the Internal Revenue Code. As a result,
the purchaser will not recognize ordinary income at the time of purchase.
Instead, the purchaser will recognize ordinary income on the dates when a
stock ceases to be subject to a substantial risk of forfeiture. The stock will
generally cease to be subject to a substantial risk of forfeiture when it is
no longer subject to our right to repurchase the stock upon the purchaser's
termination of employment with us. At such times, the purchaser will recognize
ordinary income measured as the difference between the purchase price and the
fair market value of the stock on the date the stock is no longer subject to a
substantial risk of forfeiture.

  The purchaser may accelerate to the date of purchase his or her recognition
of ordinary income, if any, and the beginning of any capital gain holding
period by timely filing an election pursuant to Section 83(b) of the Internal
Revenue Code. In such event, the ordinary income recognized, if any, is
measured as the difference between the purchase price and the fair market
value of the stock on the date of purchase, and the capital gain holding
period commences on such date. The ordinary income recognized by a purchaser
who is an employee will be subject to tax withholding by us. Different rules
may apply if the purchaser is also one of our officers, directors or 10%
stockholders.

  The foregoing is only a summary of the effect of federal income taxation
upon optionees, holders of stock purchase rights, and our company with respect
to the grant and exercise of options and stock purchase rights under the stock
option plan. It does not purport to be complete, and does not discuss the tax
consequences of the employee or consultant's death or the provisions of the
income tax laws of any municipality, state or foreign country in which the
employee or consultant may reside.

                                      11
<PAGE>

 PARTICIPATION IN THE STOCK PLAN

  The following table sets forth certain information regarding options to
purchase common stock issued during the fiscal year ended December 31, 1999 to
each of the named executive officers who participated in the stock plan, all
current officers as a group, all current directors (who are not executive
officers) as a group and all other employees who participated in the stock
plan as a group:

<TABLE>
<CAPTION>
                                               NUMBER OF SECURITIES    DOLLAR
NAME OF INDIVIDUAL AND POSITION                UNDERLYING OPTION (#) VALUE($)(1)
- -------------------------------                --------------------- -----------
<S>                                            <C>                   <C>
Gregory R. Raifman...........................        1,750,000       $88,812,500
 Chief Executive Officer
Jon L. Edwards...............................        1,500,000        76,125,000
 President
Walter Haefeker..............................        1,250,000        63,437,500
 Chief Operating Officer
Ruiqing "Barclay" Jiang......................          688,000        34,916,000
 Chief Technology Officer
Timothy M. Favia.............................          500,000        25,375,000
 Executive Vice President, Sales and Develop-
  ment
All current executive officers as a group (10
 persons)....................................        6,380,500       323,232,250
All current directors (who are not also
 executive officers) as a group (4 persons)..          150,000         7,200,000
All other employees who participated in the
 stock plan as a group (including
 consultants)................................        3,129,221       153,604,373
</TABLE>
- --------
(1) Calculated by determining the difference between the fair market value of
    the securities underlying the option at April 30, 2000 ($51.25 per share)
    and the exercise price of the option.

                                      12
<PAGE>

                                PROPOSAL NO. 3

            RATIFICATION OF APPOINTMENT OF INDEPENDENT ACCOUNTANTS

  Our board of directors has appointed PricewaterhouseCoopers LLP, independent
accountants, to audit our consolidated financial statements for the fiscal
year ending December 31, 2000 and seeks ratification of such appointment. In
the event of a negative vote on such ratification, our board of directors will
reconsider its appointment.

  Representatives of PricewaterhouseCoopers LLP are expected to be present at
the annual meeting, will have the opportunity to make a statement if they
desire to do so and are expected to be available to respond to appropriate
questions.

REQUIRED VOTE

  The affirmative vote of the holders of a majority of the votes cast is
required to ratify the appointment of PricewaterhouseCoopers LLP as our
independent accountants for the fiscal year ending December 31, 2000.

RECOMMENDATION OF THE BOARD OF DIRECTORS

  THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE "FOR" THE APPOINTMENT
OF PRICEWATERHOUSECOOPERS LLP AS THE COMPANY'S INDEPENDENT ACCOUNTANTS FOR THE
FISCAL YEAR ENDING DECEMBER 31, 2000.

                                      13
<PAGE>

                               OTHER INFORMATION

                              EXECUTIVE OFFICERS

  In addition to Messrs. Raifman and Edwards, the following persons were our
executive officers as of the record date:

<TABLE>
<CAPTION>
NAME                         AGE POSITION
- ----                         --- --------
<S>                          <C> <C>
M. Joy Fauvre...............  48 Senior Vice President, Marketing
Timothy M. Favia............  37 Executive Vice President, Sales and Development
Walter Haefeker.............  39 Chief Operating Officer
Robert M. Henely............  48 Senior Vice President, Technical Operations
Ruiqing "Barclay" Jiang.....  38 Chief Technology Officer
Brian J. Powley.............  38 Senior Vice President, Client Services
Sameer Prabhavalkar.........  37 Vice President, Finance and Controller
Alan M. Raifman.............  45 Vice President, Business and Legal Affairs
</TABLE>

  M. JOY FAUVRE has served as our Senior Vice President, Marketing since July
1999. Prior to joining us, Ms. Fauvre served as a marketing director for
Heller Financial, a commercial lender, from October 1994 to July 1999. From
June 1994 to October 1994, Ms. Fauvre served as acting advertising manager for
Qantas Airways, a commercial airline, and from August 1991 to January 1994,
she served as an account supervisor for D'Arcy Masius Benton & Bowles, an
advertising agency. Ms. Fauvre received a B.A. in theatre from the University
of California, Santa Barbara and an M.A. in theatre from Ball State
University.

  TIMOTHY M. FAVIA has served as our Executive Vice President, Sales and
Development since January 1999. Prior to joining us, Mr. Favia was a co-
founder of Oxygen Electronics, LLC, a distributor of electronic components,
where he served as managing partner from June 1997 to December 1998. From
January 1996 to May 1997, Mr. Favia served as vice president, western region,
of Open Port Technology, an Internet messaging services company. From July
1988 to January 1996, he served as director of international sales for Thomson
Software Products, a software company. Mr. Favia received a B.A. in political
science from Fairfield University.

  WALTER HAEFEKER has served as our Chief Operating Officer since January
1999. Since September 1994, Mr. Haefeker has served as a managing member for
PointBreak Ventures, LLC. From March 1994 to April 1995, Mr. Haefeker served
as chairman of the board of directors for CADIS Software, Ltd., a software
company. Mr. Haefeker received an Abitur in chemistry and physics from
Theodor-Heass Gymnasium, Pinneberg, Germany.

  ROBERT M. HENELY has served as our Senior Vice President, Technical
Operations since March 1999. Prior to joining us, Mr. Henely served as
director of engineering for Boole & Babbage, Inc., a software company, from
December 1997 to March 1999. From November 1981 to December 1997, Mr. Henely
served as a research and development manager at Hewlett-Packard Company. Mr.
Henely received a B.S. in economics from California State University, Chico
and an M.S. in econometrics from the University of California, San Diego.

  RUIQING "BARCLAY" JIANG has served as our Chief Technology Officer since
March 1999. Prior to joining us, Mr. Jiang served as president of Netranscend
Software, Inc., a business software company, from November 1996 until it was
acquired by us in March 1999. From October 1993 to September 1997, Mr. Jiang
served as a product manager for FutureLabs, Inc., a software company. Mr.
Jiang received a B.S. in computer science from Xi'an Jiaotong University,
China and an M.S. in applied statistics from Louisiana State University.

  BRIAN J. POWLEY has served as our Senior Vice President, Client Services
since October 1999. Prior to joining us, Mr. Powley served as Partner,
Worldwide Account Director for Ogilvy Interactive, the interactive division of
Ogilvy Worldwide, from February 1994 to September 1999, where he was
responsible for global strategic direction and management of IBM's Interactive
Brand Advertising. He also held positions at Ziff-Davis

                                      14
<PAGE>

from January 1994 to February 1995, and at EMAP Computing from May 1992 to
January 1994. Mr. Powley received a degree in management studies from London
Guildhall University.

  SAMEER PRABHAVALKAR has served as our Vice President of Finance and
Controller since August 1999. Prior to joining us, Mr. Prabhavalkar served in
various positions at PricewaterhouseCoopers LLP from November 1996 to August
1999, most recently as Business Assurance Manager in its high-tech group. From
February 1995 to November 1996, Mr. Prabhavalkar served as Financial
Controller at InfoGain Corporation (formerly InfoSoft, Inc.), a software and
services company. Mr. Prabhavalkar received a degree in financial management
from Bombay University and an MBA from Northeast Louisiana University. Mr.
Prabhavalkar has achieved Chartered Accountant status in India.

  ALAN M. RAIFMAN has served as our Vice President, Business and Legal Affairs
since February 1999. Prior to joining us, Mr. Raifman served as an associate
for Albert A. Rettig & Associates, a business services company, from June 1997
through January 1999. From July 1989 to June 1997, Mr. Raifman served as
President and a director of Little Cargo, Inc., a juvenile product development
company that he co-founded. Mr. Raifman is currently on the board of directors
of Little Cargo, Inc. Mr. Raifman received a B.A. in history and a J.D. from
Washington University.

COMPLIANCE WITH SECTION 16 OF THE EXCHANGE ACT

  Section 16(a) of the Securities and Exchange Act of 1934 requires our
officers and directors, and persons who own more than ten percent of a
registered class of our equity securities, to file certain reports regarding
ownership of, and transactions in, our securities with the Securities and
Exchange Commission and with The Nasdaq Stock Market, Inc. Those officers,
directors, and 10% stockholders are also required to furnish us with copies of
all Section 16(a) forms that they file.

  Based solely on our review of copies of Forms 3 and 4 and amendments to
those Forms furnished to us pursuant to Rule 16a3(e), and Forms 5 and
amendments thereto furnished to us with respect to the last fiscal year, and
any written representations referred to in Item 405(b)(2)(i) of Regulation S-K
stating that no Forms 5 were required, we believe that, during the last fiscal
year, all Section 16(a) filing requirements applicable to our officers and
directors were complied with, except that each of Pequot Capital Management,
Inc. and Lawrence D. Lenihan, Jr. did not timely file Forms 3.

                                      15
<PAGE>

           SHARE OWNERSHIP BY PRINCIPAL STOCKHOLDERS, MANAGEMENT AND
                            DIRECTORS OF MEDIAPLEX

  The following table sets forth information, as of April 30, 2000, the record
date, with respect to beneficial ownership of our common stock by:

  .  each person or entity who beneficially owns more than 5% of our common
     stock;

  .  each of our named executive officers;

  .  each of our directors; and

  .  all executive officers and directors as a group.

  Except as otherwise noted, the address of each 5% stockholder listed in the
table is: c/o Mediaplex, Inc., 177 Steuart Street, Second Floor, San
Francisco, California 94105. The table includes all shares of common stock
issuable within 60 days of April 30, 2000, upon the exercise of options and
warrants beneficially owned by the indicated stockholders on that date based
on options and warrants outstanding as of April 30, 2000. Beneficial ownership
is determined in accordance with the rules of the Securities and Exchange
Commission and includes voting and investment power with respect to shares. To
our knowledge, except under applicable community property laws or as otherwise
indicated, the persons named in the table have sole voting and sole investment
control with respect to all shares beneficially owned. The applicable
percentage of ownership for each stockholder is based on 32,987,886 shares of
common stock outstanding as of April 30, 2000, together with applicable
options and warrants for that stockholder. Shares of common stock issuable
upon exercise of options and warrants beneficially owned are deemed
outstanding for the purpose of computing the percentage ownership of the
person holding those options and warrants, but are not deemed outstanding for
computing the percentage ownership of any other person.

<TABLE>
<CAPTION>
                                                  NUMBER OF SHARES    PERCENT
                                                  OF COMMON STOCK    OF SHARES
NAME                                             BENEFICIALLY OWNED OUTSTANDING
- ----                                             ------------------ -----------
<S>                                              <C>                <C>
Zeron Capital Ltd.(1)...........................      2,625,000         8.0
 44 Church Street
 Hamilton HM12
 Bermuda
Pequot Capital Management, Inc.(2)..............      1,771,309         5.4
 500 Nyala Farm Road
 Westport, CT 06880
Gregory R. Raifman(3)...........................      7,010,312        20.2
Jon L. Edwards(4)...............................      6,760,313        19.6
Ruiqing "Barclay" Jiang(5)......................      2,265,667         6.8
Walter Haefeker(6)..............................      1,580,000         4.6
Lawrence D. Lenihan, Jr.(7).....................      1,771,309         5.4
James DeSorrento(8).............................        360,000         1.1
A. Brooke Seawell(9)............................        135,000          *
Peter S. Sealey(10).............................         60,000          *
Timothy M. Favia(11)............................        626,000         1.9
All executive officers and directors as a group
 (14 persons)(12)...............................     20,751,156        53.8
</TABLE>
- --------
*  Less than 1%

                                      16
<PAGE>

(1) Includes 1,500,000 shares held of record by Odyssey Venture Partners and
    1,000,000 shares held of record by Argossy Limited. Odyssey Venture
    Partners and Argossy Limited are venture funds affiliated with Zeron
    Capital Ltd. Also includes a warrant held by Zeron Capital Ltd. to
    purchase 125,000 shares.
(2) Includes 1,483,484 shares held of record by Pequot Private Equity Fund,
    L.P., 187,825 shares held of record by Pequot Offshore Private Equity
    Fund, Inc. and 100,000 shares held in other funds collectively managed by
    Pequot Capital Management, Inc. Pequot Private Equity Fund, L.P. and
    Pequot Offshore Private Equity Fund, Inc. are managed by Pequot Capital
    Management, Inc.
(3) Includes 19,360 shares held of record by R&E Holdings, LLC and 1,750,000
    shares issuable upon the exercise of options exercisable within 60 days of
    April 30, 2000. Mr. Raifman is one of the beneficial owners of R&E
    Holdings, LLC. Mr. Raifman disclaims beneficial interest of the shares
    held by R&E Holdings, LLC, except to the extent of his pecuniary interest
    in such entity.
(4) Includes 19,360 shares held of record by R&E Holdings, LLC and 1,500,000
    shares of Common Stock issuable upon the exercise of options exercisable
    within 60 days of April 30, 2000. Mr. Edwards is one of the beneficial
    owners of R&E Holdings, LLC. Mr. Edwards disclaims beneficial interest of
    the shares held by R&E Holdings, LLC, except to the extent of his
    pecuniary interest in such entity.
(5) Includes 286,667 shares issuable upon the exercise of options exercisable
    within 60 days of April 30, 2000.
(6) Includes 1,250,000 shares issuable upon the exercise of options
    exercisable within 60 days of April 30, 2000.
(7) Includes 1,771,309 shares beneficially owned by Pequot Capital Management,
    Inc. See note (2). Mr. Lenihan is the fund manager of Pequot Capital
    Management, Inc. Mr. Lenihan disclaims beneficial ownership of these
    shares, except to the extent of his pecuniary interest in that entity.
(8) Includes 300,000 shares held of record by DeSorrento Revocable Trust, of
    which Mr. DeSorrento is the beneficial owner, 50,000 shares held by Mr.
    DeSorrento and 10,000 shares issuable upon the exercise of option
    exercisable within 60 days of April 30, 2000.
(9) Includes 75,000 shares held of record by Seawell Revocable Trust, A.
    Brooke Seawell & Patricia C. Seawell, trustees, 50,000 shares held by Mr.
    Seawell and 10,000 shares issuable upon the exercise of option exercisable
    within 60 days of April 30, 2000. Mr. Seawell is one of the beneficial
    owners of the Seawell Revocable Trust.
(10) Includes 60,000 shares issuable upon the exercise of options exercisable
     within 60 days of April 30, 2000.
(11) Includes 500,000 shares issuable upon the exercise of a warrant
     exercisable within 60 days of April 30, 2000 and 125,000 shares issuable
     upon the exercise of options exercisable within 60 days of April 30,
     2000.
(12) See notes (3) through (11). Includes an aggregate of 5,075,972 shares
     issuable upon exercise of options and 500,000 shares issuable upon the
     exercise of warrants held by our executive officers and directors
     exercisable within 60 days of April 30, 2000.

                                      17
<PAGE>

                            EXECUTIVE COMPENSATION

  The following table sets forth the total compensation received for services
rendered to us during the fiscal years ended December 31, 1998 and 1999 by our
Chief Executive Officer and our next four most highly paid executive officers.
These five officers are referred to as the "named executive officers" in this
proxy statement. In 1998, Messrs. Gregory Raifman and Jon Edwards, general
partners of Raifman & Edwards, LLP, provided legal and management services to
us, for which Raifman & Edwards, LLP was paid approximately $197,000. See
"Related Party Transactions." Except as disclosed below and in "Related Party
Transactions," we gave no bonuses, stock-based compensation or other
compensation to our named executive officers in 1998 and 1999.

                          SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                     ANNUAL COMPENSATION
                                                ------------------------------
NAME AND PRINCIPAL POSITION                     SALARY ($) BONUS ($) OTHER ($)
- ---------------------------                     ---------- --------- ---------
<S>                                        <C>  <C>        <C>       <C>
Gregory R. Raifman, Chief Executive Offi-
 cer (1).................................. 1999  $223,333   $38,000   $8,250(2)
                                           1998  $ 35,000       --       --
Jon L. Edwards, President (3)............. 1999  $223,333   $38,000   $8,250(2)
                                           1998  $ 35,000       --       --
Walter Haefeker, Chief Operating Officer
 (4)...................................... 1999  $198,333   $34,250      --
                                           1998  $ 41,100       --       --
Ruiqing "Barclay" Jiang, Chief Technology
 Officer (5).............................. 1999  $131,762   $17,375      --
Timothy M. Favia, Executive Vice
 President, Sales and Development (6)..... 1999  $151,682   $50,500      --
</TABLE>
- --------
(1) Mr. Raifman began employment with us in September 1998.
(2) Represents an annual automobile allowance.
(3) Mr. Edwards began employment with us in April 1998.
(4) Mr. Haefeker began employment with us in September 1998.
(5) Mr. Jiang began employment with us in March 1999.
(6) Mr. Favia began employment with us in January 1999.

OPTION GRANTS DURING LAST FISCAL YEAR

  The following table sets forth certain information with respect to stock
options granted to each of our named executive officers in the fiscal year
ended December 31, 1999, including the potential realizable value over the
ten-year term of the options, based on assumed rates of stock appreciation of
0%, 5% and 10%, compounded annually. These assumed rates of appreciation
comply with the rules of the Securities and Exchange Commission and do not
represent our estimate of future stock price. Actual gains, if any, on stock
option exercises will be dependent on the future performance of our common
stock.

  In fiscal 1999, we granted options to purchase up to an aggregate of
9,659,721 shares to employees, directors and consultants. All options were
granted under our Amended and Restated 1999 Stock Plan at exercise prices at
or above the fair market value of our common stock on the date of grant, as
determined in good faith by our board of directors. All options have a term of
ten years. Optionees may pay the exercise price by cash, check, cancellation
of any outstanding indebtedness of the optionholder to us, delivery of
already-owned shares of our common stock or consideration received under a
cashless exercise program. Options listed below for Messrs. Raifman, Edwards
and Haefeker are immediately exercisable upon grant; however, any unvested
shares are subject to repurchase by us at their cost if the optionee's service
with us terminates. Option shares for Messrs. Raifman, Edwards, and Haefeker
vest at the rate of 1/6th of the shares on the six-month anniversary of the
vesting commencement date, and 1/36th of the shares per month thereafter as
long as the optionee is employed by us.

                                      18
<PAGE>

Option shares for Messrs. Jiang and Favia vest and become exercisable at the
rate of 1/4th of the shares on the one-year anniversary of the vesting
commencement date and 1/48th of the shares per month thereafter as long as the
optionee is employed by us.

<TABLE>
<CAPTION>
                                     % OF TOTAL
                                      OPTIONS                                   POTENTIAL REALIZABLE VALUE AT
                          NUMBER OF  GRANTED TO            DEEMED               ASSUMED ANNUAL RATES OF STOCK
                          SECURITIES EMPLOYEES            VALUE PER             PRICE APPRECIATION FOR OPTION
                          UNDERLYING  IN LAST   EXERCISE  SHARE ON                           TERM
                           OPTIONS     FISCAL     PRICE    DATE OF  EXPIRATION --------------------------------
NAME                       GRANTED      YEAR    PER SHARE   GRANT      DATE        0%         5%        10%
- ----                      ---------- ---------- --------- --------- ---------- ---------- ---------- ----------
<S>                       <C>        <C>        <C>       <C>       <C>        <C>        <C>        <C>
Gregory R. Raifman......  1,750,000    18.12%     $0.50    $1.125    2/19/09   $1,968,750 $3,206,886 $5,106,430
Jon L. Edwards..........  1,500,000    15.53       0.50     1.125    2/19/09    1,687,500  2,748,760  4,376,940
Walter Haefeker.........  1,250,000    12.94       0.50     1.125    2/19/09    1,406,250  2,290,633  3,647,450
Ruiqing "Barclay" Jiang.    688,000     7.12       0.50     1.125    3/25/09      774,000  1,260,764  2,007,557
Timothy M. Favia........    500,000     5.18       0.50     1.125    2/19/09      562,500    916,253  1,458,980
</TABLE>

AGGREGATE OPTION EXERCISES DURING LAST FISCAL YEAR AND FISCAL YEAR END OPTION
VALUES

  The following table sets forth information with respect to our named
executive officers concerning exercisable and unexercisable options held as of
December 31, 1999. The named executive officers did not exercise any of their
options during the fiscal year ended December 31, 1999.

  The "Value of Unexercised In-the-Money Options at December 31, 1999" is
based on a value of $62.75 per share, the closing price of our common stock on
The Nasdaq Stock Market's National Market as of December 31, 1999, less the
per share exercise price, multiplied by the number of shares issuable upon
exercise of the option. All options were granted under our Amended and
Restated 1999 Stock Plan. Options listed below for Messrs. Raifman, Edwards
and Haefeker are immediately exercisable; however, as a condition of exercise,
the optionee must enter into a restricted stock purchase agreement granting us
the right to repurchase any unvested portion of the shares issuable by such
exercise at their cost if the optionee's service with us terminates. Option
shares for Messrs. Raifman, Edwards, and Haefeker vest at the rate of 1/6th of
the shares on the six-month anniversary of the vesting commencement date, and
1/36th of the shares per month thereafter as long as the optionee is employed
by us. Option shares for Messrs. Jiang and Favia vest and become exercisable
at the rate of 1/4th of the shares on the one-year anniversary of the vesting
commencement date and 1/48th of the shares per month thereafter as long as the
optionee is employed by us.

<TABLE>
<CAPTION>
                               NUMBER OF SECURITIES              VALUE OF UNEXERCISED
                          UNDERLYING UNEXERCISED OPTIONS         IN-THE-MONEYOPTIONS
                             AT DECEMBER 31, 1999 (#)          AT DECEMBER 31, 1999 ($)
                          ----------------------------------  --------------------------
                           EXERCISABLE       UNEXERCISABLE    EXERCISABLE  UNEXERCISABLE
                          ----------------  ----------------  ------------ -------------
<S>                       <C>               <C>               <C>          <C>
Gregory R. Raifman......          1,750,000               --  $108,937,500          --
Jon L. Edwards..........          1,500,000               --    93,375,000          --
Walter Haefeker.........          1,250,000               --    77,812,500          --
Ruiqing "Barclay" Jiang.            172,000           516,000   10,707,000  $32,121,000
Timothy M. Favia........                --            500,000          --    31,125,000
</TABLE>

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

  Prior to establishing the compensation committee, our board of directors as
a whole performed the functions delegated to the compensation committee. No
member of the board of directors or the compensation committee serves as a
member of the board of directors or compensation committee of any entity that
has one or more executive officers serving as a member of our board of
directors or compensation committee.

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS DURING THE LAST FISCAL YEAR

  During the year ended December 31, 1999, we have never been party to, and
have no plan to be a party to, any transaction or series of similar
transactions in which the amount involved exceeded or will exceed

                                      19
<PAGE>

$60,000 and in which any of our director, executive officer or holder of more
than 5% of our common stock had or will have an interest, other than as
described in the transactions below.

Raifman & Edwards LLP

  Gregory R. Raifman and Jon L. Edwards, two of our current executive
officers, are general partners of Raifman & Edwards LLP. In September 1996, we
issued 350,000 shares of our common stock to Raifman & Edwards LLP, at a
purchase price of $0.0001 per share, for a total purchase price of $35. In
July 1997, we issued a convertible promissory note to Raifman & Edwards LLP,
in consideration for past services rendered, for $64,569. This convertible
promissory note bore interest at a rate of 6% per annum, and had a due date of
July 1999. In March 1999, we converted the outstanding amount and accrued
interest of $6,458 into 947,009 shares of our common stock, at a conversion
rate of $0.075 per share, for a total purchase price of $71,027. In July 1998,
Michael Schwartz transferred a convertible promissory note, issued by us, to
Raifman & Edwards LLP, which in March 1999 was converted into 4,643,228 shares
of our common stock, at a conversion rate of $0.05 per share, for a total
purchase price of $23,216. On August 6, 1999, we issued to Raifman & Edwards
LLP 19,360 shares of our Series C preferred stock in exchange for cancellation
of existing debt in the amount of $69,502.

  All shares initially issued to, or subsequently purchased by, Raifman &
Edwards LLP have been transferred to R&E Holdings, LLC, a limited liability
company in which Gregory R. Raifman and Jon L. Edwards are managing members.
On April 3, 2000, R&E Holdings, LLC distributed 5,138,453 shares to Jon L.
Edwards and 5,138,452 shares to Gregory R. Raifman.

PointBreak Ventures, LLC

  Gregory R. Raifman and Jon L. Edwards are managing members of, and hold
substantial interest in, PointBreak Ventures, LLC. Walter Haefeker, a current
executive officer, also holds a substantial interest in PointBreak Ventures,
LLC. In October 1996, we issued 250,000 shares of our common stock to
PointBreak Ventures, LLC at a purchase price of $0.0001 per share for a total
purchase price of $25. On April 3, 2000 PointBreak Ventures, LLC distributed
62,500 shares to Gregory R. Raifman, 62,500 shares to Jon L. Edwards and
125,000 shares to Walter Haefeker.

Kuni Research Corporation

  In December 1996, Mediaplex issued 800,000 shares of its common stock to
Kuni Research Corporation at a purchase price of $0.05 per share for a total
purchase price of $40,000. In February 1997, PointBreak Ventures, LLC, an
entity controlled by Gregory R. Raifman, Jon L. Edwards and Walter Haefeker,
entered into an agreement with Kuni Research Corporation, which provided that
PointBreak Ventures, LLC would render certain management services to Kuni
Research Corporation. Under the terms of that agreement, Kuni Research
Corporation, a limited partner of PointBreak Ventures, LLC, agreed to
distribute to PointBreak Ventures, LLC an amount equal to 20.0% of the
potential profits from investments made by Kuni Research Corporation or by
PointBreak Ventures, LLC on behalf of Kuni Research Corporation. On April 4,
2000, pursuant to its February 1996 agreement with PointBreak Ventures, LLC,
Kuni Research Corporation distributed 40,000 shares, 40,000 shares and 80,000
shares to Messrs. Raifman, Edwards and Haefeker, respectively, in
consideration for those past services.

CERTAIN BUSINESS RELATIONSHIPS

  In May 1998, we entered into an oral agreement with Raifman & Edwards LLP to
sublease a portion of the office space we currently occupy at our headquarters
in San Francisco, California. The sublease terms and payments made by us to
Raifman & Edwards LLP are substantially similar to the lease terms and
payments made by Raifman & Edwards LLP to the landlord. Since May 1998, we
have paid Raifman & Edwards LLP a total of approximately $121,000 for these
lease payments.


                                      20
<PAGE>

TRANSACTIONS WITH MANAGEMENT AND OTHERS

  In connection with his employment by us in January 1999, we issued a warrant
to purchase 500,000 shares of our common stock at an exercise price of $0.50
per share to Timothy M. Favia, one of our current executive officers. Such
warrant is fully vested and exercisable and expires on January 11, 2002.

  In connection with our acquisition of Netranscend Software, Inc. in March
1999, we issued to Ruiqing "Barclay" Jiang, one of our current executive
officers and formerly the sole shareholder of Netranscend Software, Inc., a
promissory note in the principal amount of $430,000, payable in four annual
installments, and an aggregate of 1,979,000 shares of common stock valued at
$2.6 million. Of the shares issued, 300,000 are currently being held in escrow
as security to cover potential breaches of representations and warranties made
by Mr. Jiang and Netranscend Software, Inc. in the agreement and plan of
reorganization executed in connection with the acquisition.

  In February 1999, we sold an aggregate of 1,206,000 shares of series A
preferred stock to investors at a purchase price of $1.25 per share or
$1,507,500 in the aggregate. In June 1999, we sold an aggregate of 4,500,000
shares of series B preferred stock to investors at a purchase price of $2.00
per share or $9,000,000 in the aggregate. In August 1999, we sold an aggregate
of 4,000,000 shares of series C preferred stock to investors at a purchase
price of $3.59 per share or $14,360,000 in the aggregate. The shares of series
A, B and C preferred stock automatically converted into an aggregate of
9,706,000 shares of common stock upon the closing of our initial public
offering. The holders of converted shares of series C preferred stock are
entitled to demand and piggy-back registration rights.

  The investors in the preferred stock included the following entities that
hold 5% or more of our stock or that are affiliated with our directors or
executive officers, or both:

<TABLE>
<CAPTION>
                                       SHARES OF SHARES OF SHARES OF
                                       SERIES A  SERIES B  SERIES C  AGGREGATE
                                       PREFERRED PREFERRED PREFERRED PURCHASE
INVESTOR                                 STOCK     STOCK     STOCK     PRICE
- --------                               --------- --------- --------- ---------
<S>                                    <C>       <C>       <C>       <C>
5% Stockholder Entities Affiliated
 with a Mediaplex Director
 or Executive Officer:
Entity affiliated with James
 DeSorrento (1)(2)....................  160,000    140,000       --  $ 480,000
Entity affiliated with A. Brooke
 Seawell (1)(3).......................      --      75,000       --    150,000
Entity affiliated with Gregory R.
 Raifman and
 Jon L. Edwards (1)(4)................      --         --     19,360    69,502
Entities affiliated with Lawrence D.
 Lenihan, Jr. (1)(5)..................      --         --  1,671,309 5,999,999
Other 5% Stockholders
 Zeron Capital Ltd. (6)...............      --   2,625,000       --  5,250,000
</TABLE>
- --------
(1) James DeSorrento, A. Brooke Seawell, Gregory R. Raifman, Jon L. Edwards
    and Lawrence D. Lenihan, Jr. are each members of our board of directors.
(2) All shares are held of record by DeSorrento Revocable Trust under an
    agreement dated 12/17/80.
(3) All shares are held of record by Seawell Revocable Trust, A. Brooke
    Seawell & Patricia C. Seawell, trustees.
(4) All shares are held of record by R&E Holdings, LLC. Messrs. Gregory R.
    Raifman and Jon L. Edwards are the managing members and beneficial owners
    of R&E Holdings, LLC. Each of Mr. Raifman and Mr. Edwards disclaims
    beneficial ownership of these shares, except to the extent of his
    respective pecuniary interest therein.
(5) Represents 1,483,484 shares of series C preferred stock held of record by
    Pequot Private Equity Fund, L.P. and 187,825 shares of series C preferred
    stock held of record by Pequot Offshore Private Equity Fund, Inc. Mr.
    Lenihan is the fund manager for Pequot Capital Management, Inc. He
    disclaims beneficial ownership of these shares except to the extent of his
    pecuniary interest therein.

                                      21
<PAGE>

(6) Includes 1,500,000 shares held of record by Odyssey Venture Partners and
    1,000,000 shares held of record by Argossy Limited. Argossy Limited and
    Odyssey Venture Partners are funds affiliated with Zeron Capital Ltd.
    Zeron Capital Ltd. also holds a warrant to purchase 125,000 shares of
    series B preferred stock.

  In connection with the sale of our series B preferred stock in June 1999, we
issued a warrant to purchase 125,000 shares of series B preferred stock, at an
exercise price of $2.00 per share, to Zeron Capital, Ltd., a 5% stockholder.
The warrant is now exercisable for 125,000 shares of our common stock. The
warrant may be exercised at any time prior to its expiration in June 2002.

  In connection with the sale of our series B preferred stock in June 1999 to
Zeron Capital, Ltd., we issued a warrant to purchase 150,000 shares of series
B preferred stock, at an exercise price of $2.00 per share, and a warrant to
purchase 100,000 shares of common stock, at a purchase price of $0.50 per
share, to Retail Ventures International, Inc., one of our financial advisors.
After our initial public offering, the warrant to purchase series B preferred
stock became exercisable for a like number of shares of our common stock. In
April 2000, both warrants were exercised for 242,938 shares of our common
stock using a net exercise provision.

                                      22
<PAGE>

        REPORT OF THE COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS

  The Compensation Committee is comprised of Peter S. Sealey and Lawrence D.
Lenihan, Jr., each who is a non-employee director. The Compensation Committee
sets, reviews and administers our executive compensation program. The role of
the Compensation Committee is to establish and recommend salaries and other
compensation paid to our executive officers and to administer our Amended and
Restated 1999 Stock Plan and 1999 Employee Stock Purchase Plan. The
Compensation Committee approves all stock option grants to executive officers,
all executive officer base salaries and any cash bonus payments to executive
officers and reviews all stock option grants to employees.

  Our executive pay programs are designed to attract and retain executives who
will contribute to our long-term success, to mesh executive and stockholder
interest through stock option based plans and to provide a compensation
package that recognizes individual contributions and performance.

  At this stage in our growth, the Compensation Committee has determined that
the most effective means of compensation are base salaries and long-term
incentives through our stock option programs.

BASE SALARIES

  The base salaries of executive officers are initially determined by
evaluating the responsibilities of the position held and the experience and
performance of the individual, with reference to the competitive marketplace
for executive talent, including a comparison to base salaries for comparable
positions in high growth, technology-based companies of reasonably similar
size in the San Francisco bay area. To assist in the process, the Compensation
Committee reviews data from independent compensation consultants concerning
the compensation paid to officers of such companies. Based on these industry
surveys, the Compensation Committee has set most executive officers' salaries
at the midpoint of the range determined in the industry surveys. The
Compensation Committee reviews executive salaries annually and adjusts them as
appropriate to reflect changes in the market conditions and individual
performance and responsibility. During fiscal 1999, salaries for executive
officers were increased by $30,000 to $55,000, depending on the executive
officer.

STOCK OPTIONS

  Under our Amended and Restated 1999 Stock Plan, stock options may be granted
to our executive officers and other employees. Upon joining us, an
individual's initial option grant is based on the individual's
responsibilities and position. The sizes of stock option awards are based
primarily on an individual's performance and responsibilities. Stock options
are granted at the fair market value of our common stock on the date of grant
which was determined by the Board of Directors prior to the initial public
offering and is now determined as the closing sales price of the common stock
on the Nasdaq National Market of The Nasdaq Stock Market. Because of the
competitive nature of the technology industry in which we compete, the
Compensation Committee believes stock option grants are an effective method of
incentivising executives to take a longer term view of our performance and to
ensure that the executive's and the stockholder's interests are aligned. In
1999, we granted an aggregate of 6,255,500 stock options under our Amended and
Restated 1999 Stock Plan to our executive officers, including 1,750,000 stock
options granted to Gregory R. Raifman, our Chief Executive Officer and
Chairman of the Board, and 1,500,000 Stock Options granted to Jon L. Edwards,
our President.

BONUSES

  The discretionary bonuses awarded by the Compensation Committee to executive
officers are determined based on achievement of individual and company
performance goals. In 1999, through employment agreements, all executive
officers were eligible to participate in any management bonus plan or similar
incentive compensation program adopted by us. In 1999, our executive officers
earned an aggregate of $273,751 in bonuses pursuant to contractual
obligations.

BENEFITS

  In 1999, we offered medical and life insurance benefits to our executive
officers that were substantially the same as those offered to all of our
regular employees.

  We maintain a retirement and deferred savings plan, or 401(k) Plan, covering
our full-time employees, including executive officers. Under the 401(k) plan,
participants may elect to contribute, through salary

                                      23
<PAGE>

contributions, up to 20% of their annual compensation, subject to a statutory
maximum. During fiscal 1999, we did not match any employee contributions under
the 401(k) plan.

CHIEF EXECUTIVE OFFICER'S COMPENSATION

  During 1999, Gregory R. Raifman served as the Company's Chief Executive
Officer and Chairman of the Board of Directors.

  In September 1999, the Compensation Committee increased Mr. Raifman's salary
from $210,000 to $250,000 and during 1999 he earned bonuses aggregating
$38,000. Prior to the August 1999 establishment of the Compensation Committee,
our Board of Directors granted Mr. Raifman an option to purchase 1,750,000
shares of our common stock. In determining Mr. Raifman's salary, the
Compensation Committee considered the same criteria it considered with respect
to the other executive officers. The Compensation Committee noted that in
1999, under Mr. Raifman's leadership, the Company successfully completed the
initial public offering of its common stock, significantly increased revenues,
developed significant strategic partnerships, and penetrated key agency
markets.

TAX LAW LIMITS ON EXECUTIVE COMPENSATION

  The Compensation Committee has considered the potential impact of Section
162(m) of the Internal Revenue Code of 1986, as amended, and the regulations
thereunder. Section 162(m) disallows a tax deduction for any publicly-held
corporation for individual compensation exceeding $1 million in any taxable
year for any of the executive officers, unless such compensation is
performance-based. Since the cash compensation of each of the executive
officers is below the $1 million threshold and the Compensation Committee
believes that any options granted under the Stock Plan will meet the
requirements of being performance-based, the Compensation Committee believes
that Section 162(m) will not reduce the tax deduction available to us. Our
policy is to qualify, to the extent reasonable, our executive officers'
compensation for deductability under applicable tax laws. However, the
Compensation Committee believes that its primary responsibility is to provide
a compensation program that will attract, retain and reward the executive
talent necessary to our success. Consequently, the Compensation Committee
recognizes that the loss of a tax deduction could be necessary in some
circumstances.

                                       COMPENSATION COMMITTEE
                                       OF THE BOARD OF DIRECTORS

                                       Peter S. Sealey
                                       Lawrence D. Lenihan, Jr.

                                      24
<PAGE>

                               PERFORMANCE GRAPH

  Set forth below is a graph comparing the cumulative total stockholder return
of $100 invested in our Common Stock on November 19, 1999 (the day our shares
commenced trading) through December 31, 1999 with the cumulative total return
of $100 invested in the Nasdaq Composite Index and a Self-Constructed Peer
Group Index calculated similarly for the same period.

                COMPARISON OF 2-MONTH CUMULATIVE TOTAL RETURN*
               AMONG MEDIAPLEX INC., THE NASDAQ COMPOSITE INDEX,
                              AND PEER GROUP (1)



*  THE GRAPH ABOVE ASSUMES $100 INVESTED ON 11/19/99 IN MEDIAPLEX, INC., THE
   NASDAQ COMPOSITE INDEX, AND THE PEER GROUP, INCLUDING REINVESTING OF
   DIVIDENDS.

<TABLE>
<CAPTION>
                                                                NASDAQ
                                                               COMPOSITE  PEER
                                               MEDIAPLEX, INC.   INDEX    GROUP
                                               --------------- --------- -------
   <S>                                         <C>             <C>       <C>
   11/19/99...................................     $100.00      $100.00  $100.00
   12/31/99...................................     $522.92      $120.78  $131.17
</TABLE>
- --------
(1) Peer Group includes the following companies: DoubleClick Inc., 24/7 Media,
    Inc., Engage Technologies, and Interpublic Group of Companies.

                                      25
<PAGE>

                                 OTHER MATTERS

  We know of no other matters to be submitted to the meeting. If any other
matters properly come before the meeting, it is the intention of the persons
named in the enclosed proxy to vote the shares they represent as our board of
directors may recommend.

  It is important that your shares be represented at the meeting, regardless
of the number of shares that you hold. You are, therefore, urged to execute
and return the accompanying proxy in the envelope that has been enclosed, at
your earliest convenience.

                                       FOR THE BOARD OF DIRECTORS
                                       Gregory R. Raifman
                                       Chairman and Chief Executive Officer

May 11, 2000

                                      26
<PAGE>

                                    ANNEX A

                     AMENDED AND RESTATED 1999 STOCK PLAN

  1. Purposes of the Plan. The purposes of this Amended and Restated 1999
Stock Plan are:

  .  to attract and retain the best available personnel for positions of
     substantial responsibility,

  .  to provide additional incentive to Employees, Directors and Consultants,
     and

  .  to promote the success of the Company's business.

  Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of
grant. Stock Purchase Rights may also be granted under the Plan.

  2. Definitions. As used herein, the following definitions shall apply:

    (a) "Administrator" means the Board or any of its Committees as shall be
  administering the Plan, in accordance with Section 4 of the Plan.

    (b) "Applicable Laws" means the requirements relating to the
  administration of stock option plans under U. S. state corporate laws, U.S.
  federal and state securities laws, the Code, any stock exchange or
  quotation system on which the Common Stock is listed or quoted and the
  applicable laws of any foreign country or jurisdiction where Options or
  Stock Purchase Rights are, or will be, granted under the Plan.

    (c) "Board" means the Board of Directors of the Company.

    (d) "Code" means the Internal Revenue Code of 1986, as amended.

    (e) "Committee" means a committee of Directors appointed by the Board in
  accordance with Section 4 of the Plan.

    (f) "Common Stock" means the common stock of the Company.

    (g) "Company" means Mediaplex, Inc., a Delaware corporation.

    (h) "Consultant" means any person, including an advisor, engaged by the
  Company or a Parent or Subsidiary to render services to such entity.

    (i) "Director" means a member of the Board.

    (j) "Disability" means total and permanent disability as defined in
  Section 22(e)(3) of the Code.

    (k) "Employee" means any person, including Officers and Directors,
  employed by the Company or any Parent or Subsidiary of the Company. A
  Service Provider shall not cease to be an Employee in the case of (i) any
  leave of absence approved by the Company or (ii) transfers between
  locations of the Company or between the Company, its Parent, any
  Subsidiary, or any successor. For purposes of Incentive Stock Options, no
  such leave may exceed ninety days, unless reemployment upon expiration of
  such leave is guaranteed by statute or contract. If reemployment upon
  expiration of a leave of absence approved by the Company is not so
  guaranteed, on the 181st day of such leave any Incentive Stock Option held
  by the Optionee shall cease to be treated as an Incentive Stock Option and
  shall be treated for tax purposes as a Nonstatutory Stock Option. Neither
  service as a Director nor payment of a director's fee by the Company shall
  be sufficient to constitute "employment" by the Company.

    (l) "Exchange Act" means the Securities Exchange Act of 1934, as amended.

    (m) "Fair Market Value" means, as of any date, the value of Common Stock
  determined as follows:

      (i) If the Common Stock is listed on any established stock exchange
    or a national market system, including without limitation the Nasdaq
    National Market or The Nasdaq SmallCap Market of The Nasdaq Stock
    Market, its Fair Market Value shall be the closing sales price for such
    stock (or the

                                      A-1
<PAGE>

    closing bid, if no sales were reported) as quoted on such exchange or
    system for the last market trading day prior to the time of
    determination, as reported in The Wall Street Journal or such other
    source as the Administrator deems reliable;

      (ii) If the Common Stock is regularly quoted by a recognized
    securities dealer but selling prices are not reported, the Fair Market
    Value of a Share of Common Stock shall be the mean between the high bid
    and low asked prices for the Common Stock on the last market trading
    day prior to the day of determination, as reported in The Wall Street
    Journal or such other source as the Administrator deems reliable; or

      (iii) In the absence of an established market for the Common Stock,
    the Fair Market Value shall be determined in good faith by the
    Administrator.

    (n) "Incentive Stock Option" means an Option intended to qualify as an
  incentive stock option within the meaning of Section 422 of the Code and
  the regulations promulgated thereunder.

    (o) "Inside Director" means a Director who is an Employee.

    (p) "Nonstatutory Stock Option" means an Option not intended to qualify
  as an Incentive Stock Option.

    (q) "Notice of Grant" means a written or electronic notice evidencing
  certain terms and conditions of an individual Option or Stock Purchase
  Right grant. The Notice of Grant is part of the Option Agreement.

    (r) "Officer" means a person who is an officer of the Company within the
  meaning of Section 16 of the Exchange Act and the rules and regulations
  promulgated thereunder.

    (s) "Option" means a stock option granted pursuant to the Plan.

    (t) "Option Agreement" means an agreement between the Company and an
  Optionee evidencing the terms and conditions of an individual Option grant.
  The Option Agreement is subject to the terms and conditions of the Plan.

    (u) "Option Exchange Program" means a program whereby outstanding Options
  are surrendered in exchange for Options with a lower exercise price.

    (v) "Optioned Stock" means the Common Stock subject to an Option or Stock
  Purchase Right.

    (w) "Optionee" means the holder of an outstanding Option or Stock
  Purchase Right granted under the Plan.

    (x) "Outside Director" means a Director who is not an Employee.

    (y) "Parent" means a "parent corporation," whether now or hereafter
  existing, as defined in Section 424(e) of the Code.

    (z) "Plan" means this Amended and Restated 1999 Stock Plan.

    (aa) "Restricted Stock" means shares of Common Stock acquired pursuant to
  a grant of Stock Purchase Rights under Section 11 of the Plan.

    (bb) "Restricted Stock Purchase Agreement" means a written agreement
  between the Company and the Optionee evidencing the terms and restrictions
  applying to stock purchased under a Stock Purchase Right. The Restricted
  Stock Purchase Agreement is subject to the terms and conditions of the Plan
  and the Notice of Grant.

    (cc) "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any successor
  to Rule 16b-3, as in effect when discretion is being exercised with respect
  to the Plan.

    (dd) "Section 16(b) " means Section 16(b) of the Exchange Act.

    (ee) "Service Provider" means an Employee, Director or Consultant.


                                      A-2
<PAGE>

    (ff) "Share" means a share of the Common Stock, as adjusted in accordance
  with Section 14 of the Plan.

    (gg) "Stock Purchase Right" means the right to purchase Common Stock
  pursuant to Section 11 of the Plan, as evidenced by a Notice of Grant.

    (hh) "Subsidiary" means a "subsidiary corporation", whether now or
  hereafter existing, as defined in Section 424(f) of the Code.

  3. Stock Subject to the Plan. Subject to the provisions of Section 14 of the
Plan, the maximum aggregate number of Shares that may be optioned and sold
under the Plan is twelve million (12,000,000) Shares, plus an annual increase
to be added on the first day of the Company's fiscal year commencing in 2000
equal to the lesser of (i) 1,000,000 Shares, (ii) 4% of the outstanding Shares
of the Company's capital stock or (iii) such lesser amount as may be
determined by the Board of Directors. The Shares may be authorized, but
unissued, or reacquired Common Stock.

  If an Option or Stock Purchase Right expires or becomes unexercisable
without having been exercised in full, or is surrendered pursuant to an Option
Exchange Program, the unpurchased Shares which were subject thereto shall
become available for future grant or sale under the Plan (unless the Plan has
terminated); provided, however, that Shares that have actually been issued
under the Plan, whether upon exercise of an Option or Right, shall not be
returned to the Plan and shall not become available for future distribution
under the Plan, except that if Shares of Restricted Stock are repurchased by
the Company at their original purchase price, such Shares shall become
available for future grant under the Plan.

  4. Administration of the Plan.

    (a) Procedure.

      (i) Multiple Administrative Bodies. The Plan may be administered by
    different Committees with respect to different groups of Service
    Providers.

      (ii) Section 162(m). To the extent that the Administrator determines
    it to be desirable to qualify Options granted hereunder as
    "performance-based compensation" within the meaning of Section 162(m)
    of the Code, the Plan shall be administered by a Committee of two or
    more "outside directors" within the meaning of Section 162(m) of the
    Code.

      (iii) Rule 16b-3. To the extent desirable to qualify transactions
    hereunder as exempt under Rule 16b-3, the transactions contemplated
    hereunder shall be structured to satisfy the requirements for exemption
    under Rule 16b-3.

      (iv) Other Administration. Other than as provided above, the Plan
    shall be administered by (A) the Board or (B) a Committee, which
    committee shall be constituted to satisfy Applicable Laws.

    (b) Powers of the Administrator. Subject to the provisions of the Plan,
  and in the case of a Committee, subject to the specific duties delegated by
  the Board to such Committee, the Administrator shall have the authority, in
  its discretion:

      (i) to determine the Fair Market Value;

      (ii) to select the Service Providers to whom Options and Stock
    Purchase Rights may be granted hereunder;

      (iii) to determine the number of shares of Common Stock to be covered
    by each Option and Stock Purchase Right granted hereunder;

      (iv) to approve forms of agreement for use under the Plan;

      (v) to determine the terms and conditions, not inconsistent with the
    terms of the Plan, of any Option or Stock Purchase Right granted
    hereunder. Such terms and conditions include, but are not

                                      A-3
<PAGE>

    limited to, the exercise price, the time or times when Options or Stock
    Purchase Rights may be exercised (which may be based on performance
    criteria), any vesting acceleration or waiver of forfeiture
    restrictions, and any restriction or limitation regarding any Option or
    Stock Purchase Right or the shares of Common Stock relating thereto,
    based in each case on such factors as the Administrator, in its sole
    discretion, shall determine;

      (vi) to reduce the exercise price of any Option or Stock Purchase
    Right to the then current Fair Market Value if the Fair Market Value of
    the Common Stock covered by such Option or Stock Purchase Right shall
    have declined since the date the Option or Stock Purchase Right was
    granted;

      (vii) to institute an Option Exchange Program;

      (viii) to construe and interpret the terms of the Plan and awards
    granted pursuant to the Plan;

      (ix) to prescribe, amend and rescind rules and regulations relating
    to the Plan, including rules and regulations relating to sub-plans
    established for the purpose of qualifying for preferred tax treatment
    under foreign tax laws;

      (x) to modify or amend each Option or Stock Purchase Right (subject
    to Section 15(c) of the Plan), including the discretionary authority to
    extend the post-termination exercisability period of Options longer
    than is otherwise provided for in the Plan;

      (xi) to allow Optionees to satisfy withholding tax obligations by
    electing to have the Company withhold from the Shares to be issued upon
    exercise of an Option or Stock Purchase Right that number of Shares
    having a Fair Market Value equal to the amount required to be withheld.
    The Fair Market Value of the Shares to be withheld shall be determined
    on the date that the amount of tax to be withheld is to be determined.
    All elections by an Optionee to have Shares withheld for this purpose
    shall be made in such form and under such conditions as the
    Administrator may deem necessary or advisable;

      (xii) to authorize any person to execute on behalf of the Company any
    instrument required to effect the grant of an Option or Stock Purchase
    Right previously granted by the Administrator;

      (xiii) to make all other determinations deemed necessary or advisable
    for administering the Plan.

    (c) Effect of Administrator's Decision. The Administrator's decisions,
  determinations and interpretations shall be final and binding on all
  Optionees and any other holders of Options or Stock Purchase Rights.

  5. Eligibility. Nonstatutory Stock Options and Stock Purchase Rights may be
granted to Service Providers. Incentive Stock Options may be granted only to
Employees.

  6. Limitations.

    (a) Each Option shall be designated in the Option Agreement as either an
  Incentive Stock Option or a Nonstatutory Stock Option. However,
  notwithstanding such designation, to the extent that the aggregate Fair
  Market Value of the Shares with respect to which Incentive Stock Options
  are exercisable for the first time by the Optionee during any calendar year
  (under all plans of the Company and any Parent or Subsidiary) exceeds
  $100,000, such Options shall be treated as Nonstatutory Stock Options. For
  purposes of this Section 6(a), Incentive Stock Options shall be taken into
  account in the order in which they were granted. The Fair Market Value of
  the Shares shall be determined as of the time the Option with respect to
  such Shares is granted.

    (b) Neither the Plan nor any Option or Stock Purchase Right shall confer
  upon an Optionee any right with respect to continuing the Optionee's
  relationship as a Service Provider with the Company, nor shall they
  interfere in any way with the Optionee's right or the Company's right to
  terminate such relationship at any time, with or without cause.

    (c) The following limitations shall apply to grants of Options:


                                      A-4
<PAGE>

      (i) No Service Provider shall be granted, in any fiscal year of the
    Company, Options to purchase more than 500,000 Shares.

      (ii) In connection with his or her initial service, a Service
    Provider may be granted Options to purchase up to an additional 500,000
    Shares which shall not count against the limit set forth in subsection
    (i) above.

      (iii) The foregoing limitations shall be adjusted proportionately in
    connection with any change in the Company's capitalization as described
    in Section 14.

      (iv) If an Option is cancelled in the same fiscal year of the Company
    in which it was granted (other than in connection with a transaction
    described in Section 14), the cancelled Option will be counted against
    the limits set forth in subsections (i) and (ii) above. For this
    purpose, if the exercise price of an Option is reduced, the transaction
    will be treated as a cancellation of the Option and the grant of a new
    Option.

  7. Term of Plan. Subject to Section 20 of the Plan, the Plan shall become
effective upon its adoption by the Board. It shall continue in effect for a
term of ten (10) years unless terminated earlier under Section 16 of the Plan.

  8. Term of Option. The term of each Option shall be stated in the Option
Agreement. In the case of an Incentive Stock Option, the term shall be ten
(10) years from the date of grant or such shorter term as may be provided in
the Option Agreement. Moreover, in the case of an Incentive Stock Option
granted to an Optionee who, at the time the Incentive Stock Option is granted,
owns stock representing more than ten percent (10%) of the total combined
voting power of all classes of stock of the Company or any Parent or
Subsidiary, the term of the Incentive Stock Option shall be five (5) years
from the date of grant or such shorter term as may be provided in the Option
Agreement.

  9. Option Exercise Price and Consideration.

    (a) Exercise Price. The per share exercise price for the Shares to be
  issued pursuant to exercise of an Option shall be determined by the
  Administrator, subject to the following:

      (i) In the case of an Incentive Stock Option

        (1) granted to an Employee who, at the time the Incentive Stock
      Option is granted, owns stock representing more than ten percent
      (10%) of the voting power of all classes of stock of the Company or
      any Parent or Subsidiary, the per Share exercise price shall be no
      less than 110% of the Fair Market Value per Share on the date of
      grant.

        (2) granted to any Employee other than an Employee described in
      paragraph (A) immediately above, the per Share exercise price shall
      be no less than 100% of the Fair Market Value per Share on the date
      of grant.

      (ii) In the case of a Nonstatutory Stock Option, the per Share
    exercise price shall be determined by the Administrator. In the case of
    a Nonstatutory Stock Option intended to qualify as "performance-based
    compensation" within the meaning of Section 162(m) of the Code, the per
    Share exercise price shall be no less than 100% of the Fair Market
    Value per Share on the date of grant.

      (iii) Notwithstanding the foregoing, Options may be granted with a
    per Share exercise price of less than 100% of the Fair Market Value per
    Share on the date of grant pursuant to a merger or other corporate
    transaction.

    (b) Waiting Period and Exercise Dates. At the time an Option is granted,
  the Administrator shall fix the period within which the Option may be
  exercised and shall determine any conditions that must be satisfied before
  the Option may be exercised.


                                      A-5
<PAGE>

    (c) Form of Consideration. The Administrator shall determine the
  acceptable form of consideration for exercising an Option, including the
  method of payment. In the case of an Incentive Stock Option, the
  Administrator shall determine the acceptable form of consideration at the
  time of grant. Such consideration may consist entirely of:

      (i) cash;

      (ii) check;

      (iii) promissory note;

      (iv) other Shares which (A) in the case of Shares acquired upon
    exercise of an option, have been owned by the Optionee for more than
    six months on the date of surrender, and (B) have a Fair Market Value
    on the date of surrender equal to the aggregate exercise price of the
    Shares as to which said Option shall be exercised;

      (v) consideration received by the Company under a cashless exercise
    program implemented by the Company in connection with the Plan;

      (vi) a reduction in the amount of any Company liability to the
    Optionee, including any liability attributable to the Optionee's
    participation in any Company-sponsored deferred compensation program or
    arrangement;

      (vii) any combination of the foregoing methods of payment; or

      (viii) such other consideration and method of payment for the
    issuance of Shares to the extent permitted by Applicable Laws.

  10. Exercise of Option.

    (a) Procedure for Exercise; Rights as a Stockholder. Any Option granted
  hereunder shall be exercisable according to the terms of the Plan and at
  such times and under such conditions as determined by the Administrator and
  set forth in the Option Agreement. Unless the Administrator provides
  otherwise, vesting of Options granted hereunder shall be tolled during any
  unpaid leave of absence. An Option may not be exercised for a fraction of a
  Share.

    An Option shall be deemed exercised when the Company receives: (i)
  written or electronic notice of exercise (in accordance with the Option
  Agreement) from the person entitled to exercise the Option, and (ii) full
  payment for the Shares with respect to which the Option is exercised. Full
  payment may consist of any consideration and method of payment authorized
  by the Administrator and permitted by the Option Agreement and the Plan.
  Shares issued upon exercise of an Option shall be issued in the name of the
  Optionee or, if requested by the Optionee, in the name of the Optionee and
  his or her spouse. Until the Shares are issued (as evidenced by the
  appropriate entry on the books of the Company or of a duly authorized
  transfer agent of the Company), no right to vote or receive dividends or
  any other rights as a stockholder shall exist with respect to the Optioned
  Stock, notwithstanding the exercise of the Option. The Company shall issue
  (or cause to be issued) such Shares promptly after the Option is exercised.
  No adjustment will be made for a dividend or other right for which the
  record date is prior to the date the Shares are issued, except as provided
  in Section 14 of the Plan.

    Exercising an Option in any manner shall decrease the number of Shares
  thereafter available, both for purposes of the Plan and for sale under the
  Option, by the number of Shares as to which the Option is exercised.

    (b) Termination of Relationship as a Service Provider. If an Optionee
  ceases to be a Service Provider, other than upon the Optionee's death or
  Disability, the Optionee may exercise his or her Option within such period
  of time as is specified in the Option Agreement to the extent that the
  Option is vested on the date of termination (but in no event later than the
  expiration of the term of such Option as set forth in the Option

                                      A-6
<PAGE>

  Agreement). In the absence of a specified time in the Option Agreement, the
  Option shall remain exercisable for three (3) months following the
  Optionee's termination. If, on the date of termination, the Optionee is not
  vested as to his or her entire Option, the Shares covered by the unvested
  portion of the Option shall revert to the Plan. If, after termination, the
  Optionee does not exercise his or her Option within the time specified by
  the Administrator, the Option shall terminate, and the Shares covered by
  such Option shall revert to the Plan.

    (c) Disability of Optionee. If an Optionee ceases to be a Service
  Provider as a result of the Optionee's Disability, the Optionee may
  exercise his or her Option within such period of time as is specified in
  the Option Agreement to the extent the Option is vested on the date of
  termination (but in no event later than the expiration of the term of such
  Option as set forth in the Option Agreement). In the absence of a specified
  time in the Option Agreement, the Option shall remain exercisable for
  twelve (12) months following the Optionee's termination. If, on the date of
  termination, the Optionee is not vested as to his or her entire Option, the
  Shares covered by the unvested portion of the Option shall revert to the
  Plan. If, after termination, the Optionee does not exercise his or her
  Option within the time specified herein, the Option shall terminate, and
  the Shares covered by such Option shall revert to the Plan.

    (d) Death of Optionee. If an Optionee dies while a Service Provider, the
  Option may be exercised within such period of time as is specified in the
  Option Agreement (but in no event later than the expiration of the term of
  such Option as set forth in the Notice of Grant), by the Optionee's estate
  or by a person who acquires the right to exercise the Option by bequest or
  inheritance, but only to the extent that the Option is vested on the date
  of death. In the absence of a specified time in the Option Agreement, the
  Option shall remain exercisable for twelve (12) months following the
  Optionee's termination. If, at the time of death, the Optionee is not
  vested as to his or her entire Option, the Shares covered by the unvested
  portion of the Option shall immediately revert to the Plan. The Option may
  be exercised by the executor or administrator of the Optionee's estate or,
  if none, by the person(s) entitled to exercise the Option under the
  Optionee's will or the laws of descent or distribution. If the Option is
  not so exercised within the time specified herein, the Option shall
  terminate, and the Shares covered by such Option shall revert to the Plan.

    (e) Buyout Provisions. The Administrator may at any time offer to buy out
  for a payment in cash or Shares an Option previously granted based on such
  terms and conditions as the Administrator shall establish and communicate
  to the Optionee at the time that such offer is made.

  11. Stock Purchase Rights.

    (a) Rights to Purchase. Stock Purchase Rights may be issued either alone,
  in addition to, or in tandem with other awards granted under the Plan
  and/or cash awards made outside of the Plan. After the Administrator
  determines that it will offer Stock Purchase Rights under the Plan, it
  shall advise the offeree in writing or electronically, by means of a Notice
  of Grant, of the terms, conditions and restrictions related to the offer,
  including the number of Shares that the offeree shall be entitled to
  purchase, the price to be paid, and the time within which the offeree must
  accept such offer. The offer shall be accepted by execution of a Restricted
  Stock Purchase Agreement in the form determined by the Administrator.

    (b) Repurchase Option. Unless the Administrator determines otherwise, the
  Restricted Stock Purchase Agreement shall grant the Company a repurchase
  option exercisable upon the voluntary or involuntary termination of the
  purchaser's service with the Company for any reason (including death or
  Disability). The purchase price for Shares repurchased pursuant to the
  Restricted Stock Purchase Agreement shall be the original price paid by the
  purchaser and may be paid by cancellation of any indebtedness of the
  purchaser to the Company. The repurchase option shall lapse at a rate
  determined by the Administrator.

    (c) Other Provisions. The Restricted Stock Purchase Agreement shall
  contain such other terms, provisions and conditions not inconsistent with
  the Plan as may be determined by the Administrator in its sole discretion.


                                      A-7
<PAGE>

    (d) Rights as a Stockholder. Once the Stock Purchase Right is exercised,
  the purchaser shall have the rights equivalent to those of a stockholder,
  and shall be a stockholder when his or her purchase is entered upon the
  records of the duly authorized transfer agent of the Company. No adjustment
  will be made for a dividend or other right for which the record date is
  prior to the date the Stock Purchase Right is exercised, except as provided
  in Section 13 of the Plan.

  12. Non-Transferability of Options and Stock Purchase Rights. Unless
determined otherwise by the Administrator, an Option or Stock Purchase Right
may not be sold, pledged, assigned, hypothecated, transferred, or disposed of
in any manner other than by will or by the laws of descent or distribution and
may be exercised, during the lifetime of the Optionee, only by the Optionee.
If the Administrator makes an Option or Stock Purchase Right transferable,
such Option or Stock Purchase Right shall contain such additional terms and
conditions as the Administrator deems appropriate.

  13. Formula Option Grants to Outside Directors. All grants of Options to
Outside Directors pursuant to this Section shall be automatic and
nondiscretionary and shall be made strictly in accordance with the following
provisions:

    (a) All Options granted pursuant to this Section shall be Nonstatutory
  Stock Options and, except as otherwise provided herein, shall be subject to
  the other terms and conditions of the Plan.

    (b) No person shall have any discretion to select which Outside Directors
  shall be granted Options under this Section or to determine the number of
  Shares to be covered by such Options.

    (c) Each person who first becomes an Outside Director following the
  effective date of this Plan, as determined in accordance with Section 7
  hereof, shall be automatically granted an Option to purchase fifty thousand
  (50,000) Shares (the "First Option") on the date on which such person first
  becomes an Outside Director, whether through election by the stockholders
  of the Company or appointment by the Board to fill a vacancy; provided,
  however, that an Inside Director who ceases to be an Inside Director but
  who remains a Director shall not receive a First Option.

    (d) Each Outside Director shall be automatically granted an Option to
  purchase ten thousand (10,000) Shares (a "Subsequent Option") on the date
  of the annual meeting of the stockholders of the Company, if as of such
  date, he or she shall have served on the Board for at least the preceding
  six (6) months.

    (e) Notwithstanding the provisions of subsections (c) and (d) hereof, any
  exercise of an Option granted before the Company has obtained stockholder
  approval of the Plan in accordance with Section 20 hereof shall be
  conditioned upon obtaining such stockholder approval of the Plan in
  accordance with Section 20 hereof.

    (f) The terms of each Option granted pursuant to this Section shall be as
  follows:

      (i) the term of the Option shall be ten (10) years.

      (ii) the exercise price per Share shall be 100% of the Fair Market
    Value per Share on the date of grant of the Option.

      (iii) subject to Section 14 hereof, each Option granted pursuant to
    this Section shall vest and become exercisable as to 25% of the Shares
    subject to the Option on the first anniversary of its date of grant,
    and as to 1/48th of the Shares subject to the Option each full month
    thereafter, provided that the Optionee continues to serve as a Service
    Provider on such dates.

  14. Adjustments Upon Changes in Capitalization, Dissolution, Merger or Asset
Sale.

    (a) Changes in Capitalization. Subject to any required action by the
  stockholders of the Company, the number of shares of Common Stock covered
  by each outstanding Option and Stock Purchase Right, and the number of
  shares of Common Stock which have been authorized for issuance under the
  Plan but as to

                                      A-8
<PAGE>

  which no Options or Stock Purchase Rights have yet been granted or which
  have been returned to the Plan upon cancellation or expiration of an Option
  or Stock Purchase Right, as well as the price per share of Common Stock
  covered by each such outstanding Option or Stock Purchase Right, shall be
  proportionately adjusted for any increase or decrease in the number of
  issued shares of Common Stock resulting from a stock split, reverse stock
  split, stock dividend, combination or reclassification of the Common Stock,
  or any other increase or decrease in the number of issued shares of Common
  Stock effected without receipt of consideration by the Company; provided,
  however, that conversion of any convertible securities of the Company shall
  not be deemed to have been "effected without receipt of consideration."
  Such adjustment shall be made by the Board, whose determination in that
  respect shall be final, binding and conclusive. Except as expressly
  provided herein, no issuance by the Company of shares of stock of any
  class, or securities convertible into shares of stock of any class, shall
  affect, and no adjustment by reason thereof shall be made with respect to,
  the number or price of shares of Common Stock subject to an Option or Stock
  Purchase Right.

    (b) Dissolution or Liquidation. In the event of the proposed dissolution
  or liquidation of the Company, the Administrator shall notify each Optionee
  as soon as practicable prior to the effective date of such proposed
  transaction. The Administrator in its discretion may provide for an
  Optionee to have the right to exercise his or her Option until ten (10)
  days prior to such transaction as to all of the Optioned Stock covered
  thereby, including Shares as to which the Option would not otherwise be
  exercisable. In addition, the Administrator may provide that any Company
  repurchase option applicable to any Shares purchased upon exercise of an
  Option or Stock Purchase Right shall lapse as to all such Shares, provided
  the proposed dissolution or liquidation takes place at the time and in the
  manner contemplated. To the extent it has not been previously exercised, an
  Option or Stock Purchase Right will terminate immediately prior to the
  consummation of such proposed action.

    (c) Merger or Asset Sale. In the event of a merger of the Company with or
  into another corporation, or the sale of substantially all of the assets of
  the Company, each outstanding Option and Stock Purchase Right shall be
  assumed or an equivalent option or right substituted by the successor
  corporation or a Parent or Subsidiary of the successor corporation. In the
  event that the successor corporation refuses to assume or substitute for
  the Option or Stock Purchase Right, the Optionee shall fully vest in and
  have the right to exercise the Option or Stock Purchase Right as to all of
  the Optioned Stock, including Shares as to which it would not otherwise be
  vested or exercisable. If an Option or Stock Purchase Right becomes fully
  vested and exercisable in lieu of assumption or substitution in the event
  of a merger or sale of assets, the Administrator shall notify the Optionee
  in writing or electronically that the Option or Stock Purchase Right shall
  be fully vested and exercisable for a period of fifteen (15) days from the
  date of such notice, and the Option or Stock Purchase Right shall terminate
  upon the expiration of such period. For the purposes of this paragraph, the
  Option or Stock Purchase Right shall be considered assumed if, following
  the merger or sale of assets, the option or right confers the right to
  purchase or receive, for each Share of Optioned Stock subject to the Option
  or Stock Purchase Right immediately prior to the merger or sale of assets,
  the consideration (whether stock, cash, or other securities or property)
  received in the merger or sale of assets by holders of Common Stock for
  each Share held on the effective date of the transaction (and if holders
  were offered a choice of consideration, the type of consideration chosen by
  the holders of a majority of the outstanding Shares); provided, however,
  that if such consideration received in the merger or sale of assets is not
  solely common stock of the successor corporation or its Parent, the
  Administrator may, with the consent of the successor corporation, provide
  for the consideration to be received upon the exercise of the Option or
  Stock Purchase Right, for each Share of Optioned Stock subject to the
  Option or Stock Purchase Right, to be solely common stock of the successor
  corporation or its Parent equal in fair market value to the per share
  consideration received by holders of Common Stock in the merger or sale of
  assets.

  15. Date of Grant. The date of grant of an Option or Stock Purchase Right
shall be, for all purposes, the date on which the Administrator makes the
determination granting such Option or Stock Purchase Right, or such other
later date as is determined by the Administrator. Notice of the determination
shall be provided to each Optionee within a reasonable time after the date of
such grant.

                                      A-9
<PAGE>

  16. Amendment and Termination of the Plan.

    (a) Amendment and Termination. The Board may at any time amend, alter,
  suspend or terminate the Plan.

    (b) Stockholder Approval. The Company shall obtain stockholder approval
  of any Plan amendment to the extent necessary and desirable to comply with
  Applicable Laws.

    (c) Effect of Amendment or Termination. No amendment, alteration,
  suspension or termination of the Plan shall impair the rights of any
  Optionee, unless mutually agreed otherwise between the Optionee and the
  Administrator, which agreement must be in writing and signed by the
  Optionee and the Company. Termination of the Plan shall not affect the
  Administrator's ability to exercise the powers granted to it hereunder with
  respect to Options granted under the Plan prior to the date of such
  termination.

  17. Conditions Upon Issuance of Shares.

    (a) Legal Compliance. Shares shall not be issued pursuant to the exercise
  of an Option or Stock Purchase Right unless the exercise of such Option or
  Stock Purchase Right and the issuance and delivery of such Shares shall
  comply with Applicable Laws and shall be further subject to the approval of
  counsel for the Company with respect to such compliance.

    (b) Investment Representations. As a condition to the exercise of an
  Option or Stock Purchase Right, the Company may require the person
  exercising such Option or Stock Purchase Right to represent and warrant at
  the time of any such exercise that the Shares are being purchased only for
  investment and without any present intention to sell or distribute such
  Shares if, in the opinion of counsel for the Company, such a representation
  is required.

  18. Inability to Obtain Authority. The inability of the Company to obtain
authority from any regulatory body having jurisdiction, which authority is
deemed by the Company's counsel to be necessary to the lawful issuance and
sale of any Shares hereunder, shall relieve the Company of any liability in
respect of the failure to issue or sell such Shares as to which such requisite
authority shall not have been obtained.

  19. Reservation of Shares. The Company, during the term of this Plan, will
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

  20. Stockholder Approval. The Plan shall be subject to approval by the
stockholders of the Company within twelve (12) months after the date the Plan
is adopted. Such stockholder approval shall be obtained in the manner and to
the degree required under Applicable Laws.

                                     A-10
<PAGE>

                                 [INSERT LOGO]

                                MEDIAPLEX, INC.
              PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
              FOR THE ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON

                              FRIDAY, JUNE 9, 2000

     The undersigned hereby appoints Gregory R. Raifman and Alan M. Raifman, or
either of them, as proxies and attorneys-in-fact, each with full power of
substitution, to represent the undersigned at the Annual Meeting of Stockholders
of Mediaplex, Inc. to be held at Mediaplex's principal offices, at 177 Steuart
Street, San Francisco, California 94105, on June 9, 2000 at 10:00 a.m., local
time, and any adjournments or postponements thereof, and to vote the number of
shares the undersigned would be entitled to vote if personally present at the
meeting.

     UNLESS A CONTRARY DIRECTION IS INDICATED, THIS PROXY WILL BE VOTED FOR ALL
NOMINEES LISTED IN PROPOSAL 1 AND FOR PROPOSALS 2 AND 3, AS MORE SPECIFICALLY
DESCRIBED IN THE PROXY STATEMENT.  IF SPECIFIC INSTRUCTIONS ARE INDICATED, THIS
PROXY WILL BE VOTED IN ACCORDANCE THEREWITH.  In their discretion, the proxies
are authorized to vote upon such other business as may properly come before the
meeting or any adjournment thereof to the extent authorized by Rule 14a-4(c)
promulgated by the Securities and Exchange Commission.

                (Continued and to be signed on the other side.)

- --------------------------------------------------------------------------------
<PAGE>

MEDIAPLEX'S MANAGEMENT RECOMMENDS A VOTE FOR ALL THE NOMINEES FOR DIRECTOR
LISTED BELOW AND A VOTE "FOR" PROPOSALS  2 AND  3.

<TABLE>
<CAPTION>

Proposal 1:  To elect directors to hold office for three years or until their
             successors are elected.

<S>                            <C>                              <C>
FOR all nominees listed at        WITHHOLD AUTHORITY             Nominees:  Lawrence D. Lenihan, Jr. and
right (except as marked to        to vote FOR ALL nominees                  Peter S. Sealey
the contrary)                     listed at right.
                                                                  To withhold authority to vote for any
         [ ]                            [ ]                       nominee(s), write such nominee(s)'
                                                                  name(s) below:

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


Proposal 2:  To ratify and approve amendments to Mediaplex's Amended and
             Restated 1999 Stock Plan to: (i) increase the number of shares
             reserved for issuance thereunder by 1,000,000 shares and (ii)
             provide for a higher annual increase, to be added on the first day
             of the fiscal year commencing in 2001, equal to the lesser of (a)
             2,500,000 shares, (b) 5% of the outstanding shares of Mediaplex's
             capital stock, or (c) such lesser amount as may be determined by
             Mediaplex's board of directors.


         FOR                          AGAINST                          ABSTAIN
         [ ]                            [ ]                              [ ]


Proposal 3:  To ratify the selection of PricewaterhouseCoopers LLP as
             Mediaplex's independent accountants for the year ended December 31,
             2000.

         FOR                          AGAINST                          ABSTAIN
         [ ]                            [ ]                              [ ]
</TABLE>

Sign exactly as your name(s) appears on your stock certificate.  If shares of
stock stand of record in the names of two or more persons or in the name of
husband and wife, whether as joint tenants or otherwise, both or all of such
persons should sign this Proxy.  If shares of stock are held of record by a
corporation, the Proxy should be executed by the President or Vice President,
and by the Secretary or Assistant Secretary.  Executors or administrators or
other fiduciaries who execute the above Proxy for a deceased Stockholder should
give their full title.

Please date the Proxy.

Signature: _________________________

Signature: _________________________

Date:      _________________________


WHETHER OR NOT YOU PLAN TO ATTEND THE MEETING IN PERSON, YOU ARE URGED TO SIGN
AND PROMPTLY MAIL THIS PROXY IN THE RETURN ENVELOPE SO THAT YOUR STOCK MAY BE
REPRESENTED AT THE MEETING.


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