FORRESTER RESEARCH INC
S-3, 1999-12-17
ENGINEERING, ACCOUNTING, RESEARCH, MANAGEMENT
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<PAGE>   1
    As filed with the Securities and Exchange Commission on December 17, 1999

                                                REGISTRATION NO. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                            FORRESTER RESEARCH, INC.
             (Exact name of registrant as specified in its charter)

              DELAWARE                                   04-2797789
    (State or other jurisdiction                      (I.R.S. Employer
  of incorporation or organization)                Identification Number)


                              400 TECHNOLOGY SQUARE
                         CAMBRIDGE, MASSACHUSETTS 02139
                                 (617) 497-7090
          (Address of principal executive offices, including zip code)


                              SUSAN M. WHIRTY, ESQ.
                   Chief Financial Officer and General Counsel
                            Forrester Research, Inc.
                              400 Technology Square
                         Cambridge, Massachusetts 02139
                                 (617) 497-7090
                              (617) 613-5643 (Fax)
              (Name and address, including zip code, and telephone
               number, including area code, of agent for service)

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

                  Please send copies of all communications to:
                             KEITH F. HIGGINS, ESQ.
                                  Ropes & Gray
                             One International Place
                           Boston, Massachusetts 02110
                                 (617) 951-7000
                              (617) 951-7050 (Fax)

Approximate date of commencement of proposed sale to the public: From time to
time after the effectiveness of the Registration Statement.

If the only securities being registered on this form are being offered pursuant
to dividend or interest reinvestment plans, please check the following
box. [ ]

If any of the securities being registered on this form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [x]

If this form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the Securities Act registration statement under the earlier effective
registration statement for the same offering. [ ]

If this form is a post effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]

If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box: [ ]

CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
===========================================================================================================================
                                                               Proposed              Proposed
                                          Amount               Maximum                Maximum
     Title of Each Class of                to be            Offering Price           Aggregate              Amount of
   Securities to be Registered          Registered            Per Unit(1)        Offering Price(1)      Registration Fee
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                       <C>                  <C>                  <C>                    <C>
Common Stock, $0.01 par value             100,426              $62.6875             $6,295,454.80           $1,662.00
===========================================================================================================================
</TABLE>
         (1) Pursuant to Rule 457(c) under the Securities Act of 1933, as
amended, the registration fee applicable to the Common Stock is calculated upon
the basis of the average high and low sales price of the Common Stock as
reported on the Nasdaq National Market on December 15, 1999.

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.

================================================================================


<PAGE>   2

The information in this prospectus is not complete and may be changed. We may
not sell these securities until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to sell these securities and it is not soliciting an offer to buy these
securities in any state where the offer or sale is prohibited.


PRELIMINARY PROSPECTUS                                     Subject to Completion
                                                               December 17, 1999


                            Forrester Research, Inc.
                                  Common Stock
                                 100,426 Shares

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


         The stockholders of Forrester Research, Inc. listed on page 8 are
offering and selling 100,426 shares of our common stock under this prospectus.

         BEFORE PURCHASING SHARES OF OUR COMMON STOCK YOU SHOULD CAREFULLY
REVIEW THE RISK FACTORS SECTION OF THIS PROSPECTUS WHICH BEGINS ON PAGE 2.

         Our common stock is listed on the Nasdaq National Market with the
trading symbol, "FORR." On December 16, 1999, the closing price of one share of
our common stock on the Nasdaq National Market was $62.75.

- --------------------------------------------------------------------------------
NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

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



                The date of this prospectus is December   , 1999


<PAGE>   3



                                TABLE OF CONTENTS

                                                                 PAGE
                                                                 ----

FORRESTER..........................................................1

RISK FACTORS.......................................................2

USE OF PROCEEDS....................................................8

SELLING STOCKHOLDERS...............................................8

PLAN OF DISTRIBUTION...............................................9

WHERE YOU CAN FIND MORE INFORMATION...............................10

LEGAL OPINIONS....................................................11

EXPERTS  .........................................................11






                                      - i -


<PAGE>   4



                                    FORRESTER

         We are a leading independent research firm offering products and
services that help our clients assess the effect of technology on their
businesses. We provide analysis and insight into a broad range of technology
areas such as electronic commerce and the Internet, computing, software,
networking and telecommunication. We also project how technology trends will
impact businesses, consumers and society. Our clients include senior management,
business strategists and marketing and information technology ("IT")
professionals within large enterprises. Our clients use our prescriptive
research to understand and benefit from current and future developments in
technology, and as support for their development and implementation decisions.

         We offer our clients annual memberships to core research that is
organized into three coverage areas:

         o        Internet Commerce,

         o        Internet Commerce Enabling Technology, and

         o        Technographics(R) Data & Analysis

         Each coverage area includes research lenses that contain focused
selections of core research relevant to specific business issues and technology
topics. These issues and topics include the impact that the application of
technology may have on financial results, investment priorities, organizational
effectiveness and staffing requirements. We also provide advisory services to a
limited number of clients to help them explore in greater detail the issues and
topics covered by the core research.

         Our principal executive offices are located at 400 Technology Square,
Cambridge, Massachusetts 02139 and our telephone number is (617) 497-7090.






                                      - 1 -


<PAGE>   5




                                  RISK FACTORS

         Pursuant to the offering contemplated by this registration, we feel
that the following important factors should be taken into account.

WE NEED TO ATTRACT AND RETAIN PROFESSIONAL STAFF IN ORDER TO OPERATE
SUCCESSFULLY

         Our future success will depend in large measure upon the continued
contributions of our senior management team, research analysts and experienced
sales personnel. Thus, our future operating results will be largely dependent
upon our ability to retain the services of these individuals and to attract
additional qualified personnel from a limited pool of qualified candidates. We
experience intense competition in hiring and retaining professional personnel
from producers of information technology products, other research firms,
management consulting firms, print and electronic publishing companies and
financial services companies. Many of these firms have substantially greater
financial resources to attract and compensate qualified personnel. The loss of
key management and professional personnel or the inability to attract such
personnel could have an adverse effect on our business, financial condition and
results of operations.

OUR INABILITY TO MANAGE GROWTH COULD ADVERSELY AFFECT OUR OPERATING RESULTS

         Our growth has placed significant demands on our management and other
resources. Our revenues increased approximately 38% to $59.6 million in the nine
months ended September 30, 1999 from $43.2 million in the nine months ended
September 30, 1998. Our ability to effectively manage growth, if any, will
require us to continue to develop and improve our operational, financial and
other internal systems. We must also continue to develop our business
development capabilities and continue to train, motivate and manage our
employees. Additionally, on November 15, 1999, we acquired 100% of the ordinary
shares of Fletcher Research Limited for approximately $19 million. Fletcher
Research Limited is an internet research company located in the United Kingdom.
We may continue to acquire complementary businesses, products or technologies.
Our management has limited experience integrating acquisitions. If we are unable
to effectively manage our growth, such inability could have an adverse effect on
the quality of our products and services, our ability to retain key personnel
and our business, financial condition and results of operations.

OUR OPERATING RESULTS FLUCTUATE AND OUR STOCK PRICE MAY BE VOLATILE AS A RESULT

         Our revenues and earnings may fluctuate from quarter to quarter based
on a variety of factors, some of which are beyond our control. The factors
include, but are not limited to:

         o      the timing and size of new and renewal memberships from clients;





                                      - 2 -


<PAGE>   6



         o        the timing of revenue-generating events sponsored by us;

         o        the utilization of our advisory services;

         o        the introduction and marketing of new products and services by
                  us and our competitors;

         o        the hiring and training of new analysts and sales personnel;

         o        changes in demand for our research; and

         o        general economic conditions.

As a result, our operating results in future quarters may be below the
expectations of securities analysts and investors which could have an adverse
effect on the market price for our common stock. Factors such as announcements
of new services or offices or strategic alliances by us or our competitors, as
well as market conditions in the information technology services industry, may
have a significant impact on the market price of the common stock. The market
price for our common stock may also be affected by movements in prices of stocks
in general.

WE DEPEND ON RENEWALS OF MEMBERSHIP-BASED RESEARCH SERVICES TO GENERATE REVENUE

         Our success depends in part upon renewals of memberships for our core
research products. Approximately 79% and 75% of our revenues in the nine months
ended September 30, 1998 and 1999, respectively, were derived from our
membership-based core research products. A significant decline in renewal rates
for our core research products could have an adverse effect on our revenues.

LOSS OF KEY PERSONNEL COULD AFFECT OUR ABILITY TO RUN OUR BUSINESS

         Our future success will depend in large part upon the continued
services of a number of key employees. The loss of key personnel, in particular
George F. Colony, our founder and Chairman of the Board of Directors, President
and Chief Executive Officer, could have an adverse effect on our business,
financial condition and results of operations. In October 1996, we entered into
a registration rights and non-competition agreement with Mr. Colony. This
agreement provides that if Mr. Colony's employment with us is terminated he will
not compete with us for the one-year period following his termination.

WE MUST ANTICIPATE AND RESPOND TO MARKET TRENDS IN ORDER TO REMAIN COMPETITIVE

         Our success depends in part upon our ability to anticipate rapidly
changing technologies and market trends and to adapt our core research to meet
the changing information




                                      - 3 -




<PAGE>   7



needs of our clients. The technology sectors that we analyze undergo frequent
and often dramatic changes. The changes include, but are not limited to:

         o        the introduction of new products and obsolescence of others;

         o        shifting strategies and market positions of major industry
                  participants;

         o        paradigm shifts with respect to system architectures; and

         o        changing objectives and expectations of users of technology.

The environment of rapid and continuous change presents significant challenges
to our ability to provide our clients with current and timely analysis,
strategies and advice on issues of importance to them. Meeting these challenges
requires the commitment of substantial resources. Any failure to continue to
provide insightful and timely analysis of developments, technologies and trends
in a manner that meets market needs could have an adverse effect on our market
position and results of operations.

OUR SUCCESS DEPENDS ON OUR ABILITY TO OFFER NEW PRODUCTS AND SERVICES

         Our future success will depend in part on our ability to offer new
products and services. These new products and services must successfully gain
market acceptance by addressing specific industry and business organization
sectors, changes in client requirements and changes in the technology industry.
The process of internally researching, developing, launching and gaining client
acceptance of a new product or service, or assimilating and marketing an
acquired product or service, is risky and costly. We may not be able to
introduce new, or assimilate acquired, products or services successfully. Our
failure to do so would adversely affect our revenues.

THE MARKET FOR RESEARCH PRODUCTS AND SERVICES IS COMPETITIVE AND INTENSE
COMPETITION COULD AFFECT OUR MARKET POSITION

         We compete in the market for research products and services with other
independent providers of similar services. Some of our competitors have
substantially greater financial, information-gathering and marketing resources
than we do. In addition, our indirect competitors include the internal planning
and marketing staffs of our current and prospective clients, as well as other
information providers such as electronic and print publishing companies,
survey-based general market research firms and general business consulting
firms. Our indirect competitors may choose to compete directly against us in the
future. In addition, there are relatively few barriers to entry into our market
and new competitors could readily seek to compete against us in one or more
market segments addressed by our products and services. Increased competition
could adversely affect our operating results through pricing pressure and loss
of market share.




                                      - 4 -


<PAGE>   8



OUR YEAR 2000 ISSUES COULD INTERRUPT OUR NORMAL BUSINESS OPERATIONS AND
ADVERSELY AFFECT OUR REVENUES

         We have implemented a broad-based remediation effort to address the
year 2000 problem. This effort consists of the following three stages:

         o         survey and assess the Company's operations for year 2000
                   compliance;

         o         execute the necessary software and hardware remedial changes;
                   and

         o         test the remediation efforts to ensure year 2000 compliance.

There can be no assurance that our survey will identify all year 2000 problems
in these areas or that the necessary corrective actions will be completed in a
timely manner.

         The first stage of the effort has been completed. We identified three
areas of operations where the year 2000 problem could arise:

         o        External product delivery systems. This includes our three
                  main platforms for electronic product delivery: our Web site,
                  FTP site and Lotus Notes system.

         o        Internal information technology systems. This includes our MIS
                  functions, customer service applications and production
                  systems.

         o        Third-party vendors and service providers. This includes a
                  review of our third-party vendor and service providers to
                  establish their readiness for the year 2000 problem and assess
                  any risks to us. Material third-party vendor and service
                  providers include: printers, mailing houses and CD-ROM
                  duplicators.

         This survey included a review of the year 2000 compliance of our
European Research Center. Our external product delivery systems, internal
information technology systems and a number of third-party vendors and service
providers are also utilized by the European Research Center. We have completed
our survey of non-IT facilities and third-party vendors that are used
exclusively by the European Research Center and have replaced vendors who are
not year 2000 compliant.

         We have also implemented the second stage of our effort. The year 2000
compliance of our external product delivery systems and internal information
technology systems ultimately depends upon the delivery of year 2000-compliant
systems from our vendors. We are working closely with our vendors to ensure the
timely delivery of year 2000 compliant systems. Our




                                       -5-


<PAGE>   9



Lotus Notes system is fully year 2000 compliant, and we have released updated
versions of our Web site and FTP site, which bring these external delivery
systems into year 2000 compliance. Our MIS systems are fully compliant and
vendor-supplied upgrades for our customer service applications and production
systems have been delivered and installed. Our survey of non-IT facilities
technology, which included a review of the elevator, HVAC, security and energy
management systems, indicated that these systems are currently year 2000
compliant.

         During this second stage, we have assessed our vulnerability to year
2000 problems of third-party vendors and service providers by requiring these
third-party vendors and service providers to complete a survey pertaining to
their year 2000 readiness. We rely on third-party suppliers primarily to deliver
printing services, mailing services, Internet and Web hosting services and
CD-ROM duplication. We have received responses from the majority of these
vendors and service providers that indicate that these vendors and service
providers are year 2000 compliant. We intend to continuously identify and
prioritize critical service providers and vendors, and communicate with them
about their plans and progress in addressing the year 2000 problem.

         The final stage of our year 2000 efforts, the internal testing of all
systems, has been completed. In the fourth quarter of 1998 we completed a
successful test of our internal IT systems and intend to continue to test these
systems during 1999 and early 2000. We have completed all testing for year 2000
compliance and will continue to monitor all of our systems during the fourth
quarter of 1999. We also have established a contingency plan that provides a
framework for decisions in the event of year 2000 induced service or systems
interruptions. This contingency plan is designed to mitigate the effects of
third parties' failures to remediate their year 2000 issues and for unexpected
failures in our own systems. Pursuant to the contingency plan, we have made
arrangements for some alternate suppliers, such as Internet service providers,
and will continue to identify potential alternate suppliers. If it becomes
necessary for us to take these corrective actions, it is uncertain whether this
would result in significant interruptions in service or delays in business
operations or whether it would have an adverse effect on our results of
operations, financial position or cash flow.

         Based on the efforts described above, we currently believe that our
systems are year 2000 compliant. However, there can be no assurance that all
year 2000 problems will be successfully identified or that the necessary
corrective actions will be completed in a timely manner. In addition, the survey
has indicated that our compliance will require the delivery of upgrades by
various vendors, and any failure to deliver these upgrades in a timely manner
will adversely affect our readiness for the year 2000 problem. We rely on the
Internet for our external distribution systems, and any failure of the Internet
due to year 2000 issues could adversely affect us.

          As of November 30, 1999, we had not incurred material costs related to
the year 2000 problem. In the future, we may incur small incremental costs in
connection with the upgrades of our external delivery systems and internal
information technology systems. We have not





                                       -6-


<PAGE>   10



deferred other information technology projects due to year 2000 expenses and do
not expect to defer such projects in the future.




                                       -7-


<PAGE>   11



                                 USE OF PROCEEDS

         All net proceeds from the sale of the shares of Forrester common stock
will go to the stockholders who offer and sell them. We will not receive any
proceeds from this offering.

                              SELLING STOCKHOLDERS

         The selling stockholders, William Reeve and Neil Bradford, acquired
their shares of Forrester common stock from us in exchange for 100% of the
ordinary shares of Fletcher Research Limited, a business that we acquired in
November 1999. This acquisition was accounted for as a pooling of interests.
Fletcher Research Limited is a limited liability company located in London,
England. Each of the selling stockholders is a party to a registration rights
agreement in which we agreed to register a portion of their shares of Forrester
common stock and to use our best efforts to keep the registration statement
effective until November 30, 2000. Registration of these shares does not
necessarily mean that the selling stockholders will sell any or all of the
shares.

         The material relationships between the selling stockholders and
Forrester are as follows: William Reeve is the research director of Fletcher
Research Limited, now a wholly-owned subsidiary of Forrester and Neil Bradford
is the managing director of Fletcher Research Limited. Each of the selling
shareholders has entered into an employment agreement with Fletcher Research
Limited. In addition, one or more of the selling stockholders may donate or
transfer as gifts some or all of their Forrester shares, or may transfer their
shares for no value to other beneficial owners. The selling stockholders will
include these donees or transferees as selling stockholders in a prospectus
supplement if the donees or transferees wish to use this prospectus to re-offer
the shares.

         The shares listed below represent all of the shares that each selling
stockholder currently beneficially owns, the number of shares each of them may
offer and the number of shares each of them will own after the offering,
assuming they sell all of the shares and that they acquire no additional shares
before the completion of this offering. Their percentage ownership in Forrester,
as of December 16, 1999, is shown in parentheses next to the number of shares.
If no percentage is indicated for a selling stockholder in the table below, that
stockholder's percentage ownership is less than one percent. Each of the selling
stockholders is subject to restrictions on the transfer of shares held by him
imposed by federal securities laws and by agreements made in connection with the
acquisition of Fletcher Research Limited. Specifically, the selling stockholders
have agreed not to transfer or otherwise dispose of shares held by them if to do
so would jeopardize our ability to account for the acquisition of Fletcher
Research Limited as a pooling transaction.





                                       -8-


<PAGE>   12

<TABLE>
<CAPTION>


                      SHARES BENEFICIALLY OWNED                         SHARES BENEFICIALLY
SELLING               AND OWNERSHIP PERCENTAGE       SHARES BEING       OWNED AND OWNERSHIP
STOCKHOLDER           PRIOR TO OFFERING              OFFERED            PERCENTAGE AFTER OFFERING
- -----------           -----------------              -------            -------------------------
<S>                        <C>                       <C>                   <C>
William Reeve              200,852  (1.85%)          50,213                150,639  (1.40%)

Neil Bradford              200,852  (1.85%)          50,213                150,639  (1.40%)
</TABLE>


                              PLAN OF DISTRIBUTION

         We are registering the shares on behalf of the selling stockholders.
"Selling stockholders" as used in this prospectus, includes donees and pledgees
selling shares received from a named selling stockholder after the date of this
prospectus. The selling stockholders may offer their shares of Forrester common
stock at various times in one or more of the following transactions:

         o            in the over-the-counter market;

         o            in private transactions other than in the over-the-counter
                      market;

         o            in connection with short sales of the shares of Forrester
                      common stock;

         o            by pledge to secure debts and other obligations;

         o            in connection with the writing of non-traded and
                      exchange-traded call options, in hedge transactions and in
                      settlement of other transactions in standardized or
                      over-the-counter options; or

         o            in a combination of any of the above transactions.

         The selling stockholders may sell their shares at market prices
prevailing at the time of sale, at prices related to such prevailing market
prices, at negotiated prices or at fixed prices.

         The selling stockholders may use broker-dealers to sell their shares.
If this happens, broker-dealers will either receive discounts or commissions
from the selling stockholders, or they will receive commissions from purchasers
of shares for whom they acted as agents.

         Selling stockholders also may resell all or a portion of the shares in
open market transactions in reliance upon Rule 144 under the Securities Act of
1933, as amended (the "Securities Act"), provided they meet the criteria and
conform to the requirements of that Rule.





                                       -9-


<PAGE>   13



                       WHERE YOU CAN FIND MORE INFORMATION

         We file annual, quarterly and special reports, proxy statements and
other information with the Securities and Exchange Commission. You may read and
copy any document we file at the SEC's public reference rooms in Washington,
D.C., New York, New York and Chicago, Illinois. Please call the SEC at
1-800-SEC-0330 for further information on the public reference rooms. Our SEC
filings are also available to the public from the SEC's Website at
"http://www.sec.gov."

         The SEC allows us to "incorporate by reference" the information we file
with them, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
considered to be part of this prospectus, and the information that we file later
with the SEC will automatically update and supersede this information. We
incorporate by reference the documents listed below and any future filings we
will make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act of 1934, as amended:

         1.       Our Annual Report on Form 10-K for the fiscal year ended
                  December 31, 1998 as filed with the SEC on March 31, 1999;

         2.       Our Quarterly Report on Form 10-Q for the quarters ended
                  September 30, 1999, June 30, 1999 and March 31, 1999 as
                  filed with the SEC on November 12, 1999, August 16, 1999
                  and May 13, 1999, respectively;

         3.       Our Current Report on Form 8-K as filed with the SEC on
                  November 30, 1999;

         4.       Our Proxy Statement as filed with the SEC on April 8, 1999;
                  and

         5.       Our Registration Statement on Form 8-A as filed with the
                  SEC on September 26, 1996, including any amendment or
                  report filed for the purpose of updating such description.

         Fletcher Research Limited is not a "significant subsidiary" for
purposes of Regulation S-X and, as such, financial statements covering its
operations are not provided. In addition, although we plan to use the pooling
method of accounting for the acquisition of Fletcher Research Limited, we will
not restate our financial statements because the acquisition is not material to
our historical financial statements.

         You may request a copy of these filings, at no cost, by writing or
telephoning us at the following address:

                     Forrester Research, Inc.
                     400 Technology Square
                     Cambridge, Massachusetts  02139
                     Attention:  General Counsel
                     (617) 497-7090

         This prospectus is part of a registration statement that we have filed
with the SEC. You should rely only on the information or representations
provided in this prospectus. We have not authorized nor have any of the selling
stockholders authorized anyone to provide you with different




                                      -10-


<PAGE>   14



information. The selling stockholders are not making an offer of these
securities in any state where the offer is not permitted. You should not assume
that the information in this prospectus is accurate as of any date other than
the date on the front of the document.

                                 LEGAL OPINIONS

         For the purpose of this offering, Ropes & Gray, Boston, Massachusetts,
is giving its opinion on the validity of the shares.

                                     EXPERTS

         The audited financial statements incorporated by reference in this
prospectus and elsewhere in the registration statement have been audited by
Arthur Andersen LLP, independent public accountants, as indicated in their
reports with respect thereto, and are included herein upon the authority of said
Firm as experts in giving said reports.





                                      -11-


<PAGE>   15



                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

         The following statement sets forth the estimated amounts of expenses to
be borne by us in connection with the offering described in this Registration
Statement:

SEC Registration Fee...................................  $ 1,662
Legal Fees and Expenses................................  $15,000*
Miscellaneous Expenses.................................  $10,000*
                                                         -------
         Total Expenses................................  $36,662
                                                         =======
- ---------------

* Estimated


ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         Section 145 of the Delaware General Corporation Law ("DGCL") provides
that a corporation may indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding, whether civil, criminal or investigative (other than an
action by or in the right of the corporation) by reason of the fact that he is
or was a director, officer, employee or agent of the corporation, or is or was
serving at the request of the corporation as a director, officer, employee or
agent of another corporation, partnership, joint venture, trust or other
enterprise, against expenses (including attorney's fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred by him in connection
with such action, suit or proceeding if he acted in good faith and in a manner
he reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. Section 145 further
provides that a corporation similarly may indemnify any such person serving in
any such capacity who was or is a party or is threatened to be made a party to
any threatened, pending or completed action or suit by or in the right of the
corporation to procure a judgment in its favor, against expenses actually and
reasonably incurred in connection with the defense or settlement of such action
or suit if he acted in good faith and in a manner he reasonably believed to be
in or not opposed to the best interests of the corporation and except that no
indemnification shall be made in respect of any claim, issue or matter as to
which such person shall have been adjudged to be liable to the corporation
unless and only to the extent that the Delaware Court of Chancery or such other
court in which such action or suit was brought shall determine upon application
that, despite the adjudication of liability but in view of all the circumstances
of the case, such person is fairly and reasonably entitled to indemnify for such
expenses which the Court of Chancery or such other court shall deem proper.

         Section 102(b)(7) of the DGCL permits a corporation to include in its
certificate of incorporation a provision eliminating or limiting the personal
liability of a director to the




                                      -12-


<PAGE>   16


corporation or its stockholders for monetary damages for breach of fiduciary
duty as a director, provided that such provision shall not eliminate or limit
the liability of a director (i) for any breach of the director's duty of loyalty
to the corporation or its stockholders, (ii) for acts or omissions not in good
faith or which involve intentional misconduct or a knowing violation of law,
(iii) under Section 174 of the DGCL (relating to unlawful payment of dividends
and unlawful stock purchase and redemption) or (iv) for any transaction from
which the director derived an improper personal benefit.

         Our Certificate of Incorporation provides that our Directors shall not
be liable to us or our stockholders for monetary damages for breach of fiduciary
duty as a director except to the extent that exculpation from liabilities is not
permitted under the DGCL as in effect at the time such liability is determined.
Our Certificate of Incorporation further provides that we shall indemnify our
directors and officers to the fullest extent permitted by the DGCL.

         We have a liability insurance policy in effect which covers certain
claims against any of our officers or directors by reason of certain breaches of
duty, neglect, errors or omissions committed by such person in his or her
capacity as an officer or director.

                  For the undertaking with respect to indemnification, see Item
17 herein.

ITEM 16.  EXHIBITS

4.1      Registration Rights Agreement dated November 15, 1999 by and among the
         Registrant and William Reeve and Neil Bradford

5.       Opinion of Ropes & Gray re: validity of shares

23.1     Consent of Arthur Andersen LLP

23.5     Consent of Ropes & Gray (included in the opinion filed as Exhibit 5.)

24.1     Power of Attorney (included as part of signature page filed herewith)

ITEM 17.  UNDERTAKINGS

         The undersigned registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this registration statement: (i) to include any
prospectus required by section 10(a)(3) of the Securities Act of 1933; (ii) to
reflect in the prospectus any facts or events arising after the effective date
of the registration statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change
in the information set forth




                                      -13-


<PAGE>   17




in the registration statement and (iii) to include any material information with
respect to the plan of distribution not previously disclosed in the registration
statement or any material change to such information in the registration
statement.

         (2) That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         (4) That, for purposes of determining any liability under the
Securities Act of 1933, each filing of the registrant's annual report pursuant
to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (5) To deliver or cause to be delivered with the prospectus, to each
person to whom the prospectus is sent or given, the latest annual report to
security holders that is incorporated by reference in the prospectus and
furnished pursuant to and meeting the requirements of Rule 14a-3 or Rule 14c-3
under the Securities Exchange Act of 1934; and, where interim financial
information required to be presented by Article 3 of Regulation S-X are not set
forth in the prospectus, to deliver, or cause to be delivered to each person to
whom the prospectus is sent or given, the latest quarterly report that is
specifically incorporated by reference in the prospectus to provide such interim
financial information.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the registrant pursuant to the provisions described in Item 15 above, or
otherwise, the registrant has been advised that in the opinion of the Securities
and Exchange Commission, such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person in the successful defense of any action, suit or proceeding) is asserted
by such officer, director or controlling person in connection with the
securities being registered, the registrant will, unless in the opinion of its
counsel the matter has been settled by controlling precedent, submit to a court
of appropriate jurisdiction the question of whether or not such indemnification
by it is against public policy as expressed in the Act and will be governed by
the final adjudication of such issue.




                                      -14-


<PAGE>   18




                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Cambridge, The Commonwealth of Massachusetts, on this
17th day of December, 1999.

                              FORRESTER RESEARCH, INC.


                                  /s/ Susan M. Whirty
                              By: _____________________________________
                                  Susan M. Whirty
                                  Chief Financial Officer, Vice President,
                                  Operations and General Counsel

                                POWER OF ATTORNEY

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated. Each person whose signature appears below
hereby authorizes Susan M. Whirty, with full power of substitution, to execute
in the name of and on behalf of such person any amendment (including any
post-effective amendment) to this Registration Statement and to file the same,
with exhibits thereto, and other documents in connection therewith, making such
changes in this Registration Statement as the person(s) so acting deems
appropriate, and appoints each of such persons, each with full power of
substitution, attorney-in-fact to sign any amendment (including any
post-effective amendment to this Registration Statement) and to file the same,
with exhibits thereto, and other documents in connection therein.

SIGNATURE                          TITLE                             DATE
- ---------                          -----                             ----

/s/ George F. Colony    President, Chief Executive Officer     December 17, 1999
____________________    and Chairman of the Board
George F. Colony

/s/ Susan M. Whirty     Chief Financial Officer and General    December 17, 1999
___________________     Counsel (Principal Financial and
Susan M. Whirty         Accounting Officer)










                                      -15-


<PAGE>   19



/s/ Robert M. Galford
______________________      Director                         December 17, 1999
Robert M. Galford

/s/ George R. Hornig
______________________      Director                         December 17, 1999
George R. Hornig

/s/ Michael H. Wells
______________________      Director                         December 17, 1999
Michael H. Wells

/s/ Henk W. Broeders
______________________      Director                         December 17, 1999
Henk W. Broeders






                                      -16-

<PAGE>   20




                                  EXHIBIT INDEX

NUMBER                       TITLE OF EXHIBIT                           PAGE
- ------                       ----------------                           ----

4.1        Registration Rights Agreement dated November 15, 1999 by
           and among the Registrant and William Reeve and
           Neil Bradford                                                  18

5.         Opinion of Ropes & Gray re: validity of shares                 34

23.1       Consent of Arthur Andersen LLP                                 36

23.5       Consent of Ropes & Gray (included in the opinion filed
           as Exhibit 5.)                                                 34

24.1       Power of Attorney (included as part of signature page
           filed herewith)                                                15




                                      -17-



<PAGE>   1

                                                                     EXHIBIT 4.1


                          REGISTRATION RIGHTS AGREEMENT


     This REGISTRATION RIGHTS AGREEMENT (the "AGREEMENT") is made and entered
into as of November 15, 1999 by and among FORRESTER RESEARCH, INC., a Delaware
corporation ("BUYER"), and NEIL BRADFORD AND WILLIAM REEVE, the former
shareholders of FLETCHER RESEARCH, a limited liability corporation under the
laws of the United Kingdom (collectively the "SHAREHOLDERS" and individually a
"SHAREHOLDER").

                                    RECITALS

     WHEREAS, Buyer and the Shareholders are parties to a certain Stock Purchase
Agreement dated as of November 15, 1999 (the "PURCHASE AGREEMENT") pursuant to
which Buyer is acquiring all of the issued share capital of Fletcher from the
Shareholders in exchange for the issuance by Buyer of shares of Buyer's Common
Stock, $0.01 par value per share (the "BUYER COMMON STOCK"), as set forth in the
Purchase Agreement.

     WHEREAS, the execution and delivery of this Registration Rights Agreement
by the parties hereto is a condition precedent to the obligations of the parties
to consummate the transactions under the Purchase Agreement.

                                    AGREEMENT

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein, the parties hereto agree as follows:

     1.   DEFINITIONS

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

          "1933 ACT" means the Securities Act of 1933, as amended, and the rules
and regulations promulgated by the Commission thereunder, as in effect from time
to time.

          "1934 ACT" means the Securities Exchange Act of 1934, as amended, and
the rules and regulations promulgated by the Commission thereunder, as in effect
from time to time.

          "BUSINESS DAY" means each Monday, Tuesday, Wednesday, Thursday and
Friday that is not a day on which banking institutions in New York City are
authorized or obligated by law or executive order to close.

                                      -18-
<PAGE>   2

          "CLOSING DATE" means the closing date specified in the Purchase
Agreement.

          "COMMISSION" means the United States Securities and Exchange
Commission.

          "HOLDER" means any person owning Registrable Securities who is a party
to this Agreement, and any transferee thereof in accordance with Section 11 of
this Agreement.

          "PROSPECTUS" means the prospectus included in any Registration
Statement, as amended or supplemented by any prospectus supplement (including,
without limitation, any prospectus supplement with respect to the terms of the
offering of any portion of the Registrable Securities covered by such
Registration Statement), and all other amendments and supplements to the
Prospectus, including post-effective amendments, and all material incorporated
by reference or deemed to be incorporated by reference in such Prospectus.

          "REGISTER, REGISTRATION AND REGISTERED" means a registration effected
by preparing and filing a registration statement or similar document with the
Commission in compliance with the 1933 Act, and the declaration or ordering of
effectiveness of such registration statement or document.

          "REGISTRABLE SECURITIES" means twenty-five percent (25%) of the shares
of Buyer Common Stock issued to each Shareholder on the Closing Date pursuant to
the Purchase Agreement and held continuously from the Closing Date by the
Shareholders; PROVIDED, HOWEVER, that those shares as to which the following
apply shall cease to be Registrable Securities if: (a) a Registration Statement
with respect to the sale of such Registrable Securities shall have become
effective under the 1933 Act and such Registrable Securities shall have been
disposed of under such Registration Statement; (b) such Registrable Securities
shall have become transferable, and have been so transferred, in accordance with
the resale provisions of Rule 144 or any successor rule or provision, under the
1933 Act; (c) such Registrable Securities shall have been transferred in a
transaction in which a Shareholder's rights and obligations under this Agreement
were not properly assigned in accordance with this Agreement; (d) such
Registrable Securities shall have ceased to be outstanding; or (e) the shares of
Buyer Common Stock have previously been sold in accordance with the terms of
this Agreement.

          "REGISTRATION EXPENSES" means all expenses incident to Buyer's
performance of or compliance with Section 2 hereof, including, without
limitation, all registration and filing fees; PROVIDED, HOWEVER, that
Registration Expenses shall not include underwriters' discounts or commissions
associated with the sale of the Registrable Securities.

          "REGISTRATION PERIOD" means the period commencing on the date hereof
or and continuing through November 30, 2000.

                                      -19-

<PAGE>   3

          "REGISTRATION STATEMENT" means a registration statement prepared and
filed with the Commission in compliance with the 1933 Act.

          "RELEASE DATE" means the date the Company makes available financial
results covering at least 30 days of combined operations of the Company and
Fletcher following the Closing Date.

          "SELLER" means any person, including any Holder, participating in an
offering of any Registrable Securities of Buyer pursuant to this Agreement.

          "SELLING EXPENSES" means all applicable transfer taxes and any fees of
accountants or other advisors for any Seller of the Registrable Securities being
registered.

          "SHELF REGISTRATION" means a registration effected pursuant to a shelf
Registration Statement of Buyer, on an appropriate form under Rule 415 under the
1933 Act, or any similar rule that may be adopted by the Commission, all
amendments and supplements to such registration statement, including
post-effective amendments, in each case including the Prospectus contained
therein, all exhibits thereto and all material incorporated by reference
therein. A Registration Statement relating to a Shelf Registration shall be
referred to herein as the "SHELF REGISTRATION STATEMENT." The Shelf Registration
Statement shall be effected on Form S-3 or any successor form prescribed by the
Commission.

     2.   SHELF REGISTRATION RIGHTS

     2.1  SHELF REGISTRATION

     Subject to the limitations set forth elsewhere in this Section 2, by
December 31, 1999, Buyer shall file to effect qualification and registration of
the Registrable Securities under the Securities Act on a Form S-3 Registration
Statement (or any other shelf registration statement form for which it is then
eligible or which Buyer may have available for the registration of equity
securities) as a Shelf Registration. Buyer shall not be required to effect more
than one registration on Form S-3 pursuant to the provisions of this Section 2.

     2.2  LIMITATION ON SHELF REGISTRATION OBLIGATION

     Notwithstanding the provisions of Section 2.1, and subject to the
limitations described below in this Section 2 and Section 3, Buyer shall not be
obligated to effect the filing of a Registration Statement pursuant to this
Section 2 if Buyer shall furnish to the Holders a certificate signed by a Vice
President of Buyer stating that in the good faith judgment of the Board of
Directors of Buyer, it would not be in the best interests of Buyer and its
stockholders for such Registration Statement to be filed under the circumstances
specified in Section 2.3(b) for which Buyer could send a Suspension Notice, and
Buyer shall, subject to the limitations set forth in Section 2.3(d) hereof, have
the right to defer such filing or the effectiveness of such

                                      -20-

<PAGE>   4

Registration Statement, for a period of not more than 90 days; PROVIDED,
HOWEVER, that Buyer may not utilize the right set forth in this Section 2.2 more
than once. Buyer shall use its reasonable efforts to keep a Registration
Statement filed pursuant to this Section 2 effective until November 30, 2000. If
Buyer utilizes the right set forth in this Section 2, the Registration Period
shall be extended for the number of days for which any filing was deferred as
specified in the notice; PROVIDED, HOWEVER, that the Registration Period need
not be extended pursuant to this subsection by a period of longer than six
months.

     2.3    SELLING PROCEDURES; SUSPENSION

     Each Holder of Registrable Securities agrees to give written notice to the
Buyer at least two (2) Business Days prior to any intended sale or distribution
of Registrable Securities under the Shelf Registration Statement referred to in
Section 2.1, which notice shall specify the date on which such Holder intends to
begin such sale or distribution. As soon as practicable after the date such
notice is received by Buyer, and in any event within two (2) Business Days after
such date, Buyer shall comply with either paragraph (a) or (b) below.

          (a) Unless paragraph (b) below applies, Buyer shall (i) if deemed
necessary by Buyer, prepare and file with the Commission a post-effective
amendment to the Shelf Registration Statement or a supplement to the related
Prospectus or a supplement or amendment to any document incorporated therein by
reference or file any other required document so that such Registration
Statement will not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading, and so that, as thereafter delivered to
purchasers of the Registrable Securities being sold thereunder, such Prospectus
will not contain an untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading; (ii) provide the Holders of the Registrable Securities who gave such
notice copies of any documents filed pursuant to Section 2.3(a)(i); and (iii)
inform each such Holder that Buyer has complied with its obligations in Section
2.3(a)(i) (or that, if Buyer has filed a post-effective amendment to the Shelf
Registration Statement which has not yet been declared effective, Buyer will
notify each such Holder to that effect, will use its reasonable efforts to
secure the effectiveness of such post-effective amendment and will immediately
notify each such Holder pursuant to Section 2.3(a)(i) hereof when the amendment
has become effective). Each Holder who has given notice of intention to
distribute such Holder's Registrable Securities in accordance with Section 2.3
hereof (a "NOTICE HOLDER") shall sell all or any of such Registrable Securities
pursuant to the Shelf Registration Statement and related Prospectus only during
the 90-day period commencing with the date on which Buyer gives notice, pursuant
to Section 2.3(a)(iii), that the Registration Statement and Prospectus may be
used for such purpose (such 90-day period is referred to as a "SELLING PERIOD").
The Notice Holders will not sell any Registrable Securities pursuant to such
Registration Statement or Prospectus after such Selling Period without giving a
new notice of intention to sell pursuant to

                                      -21-
<PAGE>   5

Section 2.3 hereof and receiving a further notice from Buyer pursuant to Section
2.3(a)(iii) hereof or paragraph (b) below.

          (b) In the event of (i) any request by the Commission or any other
federal or state governmental authority during the period of effectiveness of
the Shelf Registration Statement for amendments or supplements to a Shelf
Registration Statement or related Prospectus or for additional information; (ii)
the issuance by the Commission or any other federal or state governmental
authority of any stop order suspending the effectiveness of a Shelf Registration
Statement or the written threat or initiation of any proceedings for that
purpose; (iii) the receipt by Buyer of any notification with respect to the
suspension of the qualification or exemption from qualification of any of the
Registrable Securities for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose; (iv) any event or circumstance
which necessitates the making of any changes in the Shelf Registration Statement
or Prospectus, or any document incorporated or deemed to be incorporated therein
by reference, so that, in the case of the Shelf Registration Statement, it will
not contain any untrue statement of a material fact or any omission to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading, and that in the case of the Prospectus, it will not
contain any untrue statement of a material fact or any omission to state a
material fact required to be stated therein or necessary to make the statements
therein, in the light of the circumstances under which they were made, not
misleading; (v) that Buyer is in possession of material information that it
deems advisable not to disclose in a Registration Statement or (vi) that, in the
good faith judgment of Buyer's Board of Directors, it is advisable to suspend
use of the Prospectus (a "SUSPENSION") for a discrete period of time due to
pending corporate developments, public filings with the Commission or similar
events; then, subject to paragraph (d) below, Buyer shall deliver a certificate
in writing to the Notice Holders (the "SUSPENSION NOTICE") to the effect of the
foregoing and, upon receipt of such Suspension Notice, each such Notice Holder's
Selling Period will not commence until such Notice Holder's receipt of copies of
the supplemented or amended Prospectus provided for in Section 2.3(a)(i) hereof,
or until it is advised in writing by Buyer that the Prospectus may be used, and
has received copies of any additional or supplemental filings that are
incorporated or deemed incorporated by reference in such Prospectus.

          (c) In the event any of the events or circumstances listed in the
foregoing paragraph (b) occur or exist after a Selling Period has commenced,
subject to paragraph (d) below, Buyer shall have the same right to suspend such
Selling Period by delivery of a Suspension Notice as Buyer would have had if the
Selling Period had not yet commenced, and any such suspension of a Selling
Period shall be deemed included within the meaning of the term "Suspension" for
all purposes under this Agreement.

          (d) In the event of any Suspension, or any delay in effecting the
Shelf Registration under Section 2.2 above, Buyer will use its reasonable
efforts to ensure that the use of the Prospectus so suspended or delayed may be
commenced or resumed, as the case may be, and that any Selling Period so
suspended will commence or resume, as the case may be, as

                                      -22-

<PAGE>   6

soon as practicable and, in the case of a pending development, filing or event
referred to in Section 2.3(b)(iv) or (v) hereof, as soon, in the judgment of
Buyer's Board of Directors, as disclosure of the material relating to such
pending development, filing or event would not have an adverse effect on Buyer's
ability to consummate the transaction, if any, to which such development, filing
or event relates. Notwithstanding any other provision of this Agreement, Buyer
shall have the right to cause a maximum of two (2) Suspensions, neither of which
may be within 30 days of the other, as provided above (including for this
purpose a delay in effecting the Shelf Registration pursuant to Section 2.2
above) during any 12-month period after the initial effective date of the Shelf
Registration Statement, and the total number of days in any 12-month period
during which a Suspension or Suspensions (including for this purpose a delay in
effecting the Shelf Registration Statement pursuant to Section 2.2 above) may be
in effect shall not exceed 90 days.

          (e) Subject to the provisions of Section 2.2, Buyer will use its
reasonable efforts to maintain the effectiveness until November 30, 2000 of any
Registration Statement pursuant to which any of the Registrable Securities are
being offered. Buyer from time to time will amend or supplement such
Registration Statement and the Prospectus contained therein to the extent
necessary to comply with the 1933 Act and any applicable state securities
statute or regulation. Buyer will also provide each holder of Registrable
Securities with as many copies of the Prospectus contained in any such
Registration Statement as it may reasonably request.

     3.   RESTRICTIONS ON TRANSFER OF SHARES; RULE 144 AVAILABILITY

          (a) The Holders agree, understand and acknowledge that the issuance of
the Registrable Securities to the Holders has not been, and, except as
contemplated in this Agreement, the sale or other disposition thereof by the
Holders will not be, registered under the 1933 Act or the securities laws of any
state and that the transfer, sale, disposal or assignment of such shares is
subject to restriction as set forth in Section 6.10 and 6.11 of the Purchase
Agreement and will bear the legends set forth in those Sections. The Holders
acknowledge that, except as expressly set forth in this Agreement, the Holders
have no right to require Buyer to cause the registration of any Registrable
Securities.

          (b) With a view to making available to the Holders the benefits of
Rule 144 promulgated under the 1933 Act and Form S-3 and any other rule or
regulation of the Commission that may at any time after the Release Date permit
such Holder to sell securities of the Company to the public without
registration, the Company agrees to use its best efforts to:


          (i)  make and keep public information available, as those terms are
               understood and defined in Rule 144 under the 1933 Act;

                                      -23-

<PAGE>   7
           (ii) file with the Commission in a timely manner all reports and
                other documents required of the Company under the 1933 Act and
                the 1934 Act; and

          (iii) furnish to any holder of Registrable Shares upon request a

                written statement by the Company as to its compliance with the
                reporting requirements of said Rule 144 and of the 1933 Act and
                the 1934 Act, a copy of the most recent annual or quarterly
                report of the Company, and such other reports and documents of
                the Company as such holder may reasonably request to avail
                itself of any similar rule or regulation of the Commission
                allowing it to sell any such securities without registration.

     4.    EXPENSES

     Buyer will pay all Registration Expenses in connection with the
registration of Registrable Securities effected by Buyer pursuant to Section 2.
Holders of Registrable Securities registered pursuant to this Agreement shall
pay all Selling Expenses associated with such registration, with each Holder
bearing a pro rata portion of the Selling Expenses based upon the number of
Registrable Securities registered by each Holder.

     5.    EXPIRATION OF REGISTRATION RIGHTS

     The obligations of Buyer under Section 2 of this Agreement to register the
Registrable Securities shall expire and terminate at such time as the
Shareholders shall be entitled or eligible to sell all such securities in the
United States or to a U.S. person (as defined in Regulation S under the 1933
Act) without restriction and without a need for the filing of a registration
statement under the 1933 Act. The obligations of Buyer under Section 2 of this
Agreement shall expire on November 30, 2000 (provided no stop transfer orders
are in place with the transfer agent).

     6.    REGISTRATION PROCEDURES

     In connection with the registration of Registrable Securities under this
Agreement, and subject to the other provisions of this Agreement, Buyer shall:

          (a) use its reasonable efforts to cause the Registration Statement
filed in accordance with Section 2 to become effective as soon as practicable
after the Release Date;

          (b) prepare and file with the Commission such amendments and
supplements to such Registration Statement and the Prospectus used in connection
therewith as may be necessary to keep such Registration Statement continuously
effective for the shorter of (i) the duration of its registration obligations
pursuant to Section 2, or (ii) until there are no

                                      -24-

<PAGE>   8

Registrable Securities outstanding, and to comply with the provisions of the
1933 Act with respect to the disposition of the Registrable Securities;

          (c) furnish to each Seller of such Registrable Securities such number
of copies of the Prospectus included in such Registration Statement as such
Seller may reasonably request in order to facilitate the sale or disposition of
such Registrable Securities;

          (d) use its reasonable efforts to register or qualify all securities
covered by such Registration Statement under such other securities or "blue sky"
laws of such jurisdictions as each Seller shall reasonably request, and do any
and all other acts and things as may be reasonably necessary to enable such
Seller to consummate the disposition in such jurisdictions of its Registrable
Securities covered by such Registration Statement, except that Buyer shall not
for any such purpose be required to qualify generally to do business as a
foreign corporation in any jurisdiction wherein it is not so qualified, or to
subject itself to taxation in respect of doing business in any such
jurisdiction, or to consent to general service of process in any such
jurisdiction;

          (e) notify each Seller of Registrable Securities covered by such
Registration Statement, at any time when a Prospectus relating thereto is
required to be delivered under the 1933 Act, of the happening of any event as a
result of which the Prospectus included in such Registration Statement, as then
in effect, includes an untrue statement of a material fact or omits to state any
material fact required to be stated therein or necessary to make the statements
therein not misleading in light of the circumstances then existing or if it is
necessary to amend or supplement such Prospectus to comply with the law, and at
the request of any such Seller, prepare and furnish to such Seller a reasonable
number of copies of a supplement to or an amendment of such Prospectus as may be
necessary so that, as thereafter delivered to the purchasers of such Registrable
Securities or securities, such Prospectus, as amended or supplemented, will
comply with the law;

          (f) use its best efforts to comply with all applicable rules and
regulations of the Commission;

          (g) use its best efforts to qualify such securities for listing on the
Nasdaq National Market, and provide a transfer agent and registrar for such
Registrable Securities not later than the effective date of such Registration
Statement; and

          (h) issue to any person to which any Holder of Registrable Securities
may sell such Registrable Securities in connection with such registration
certificates evidencing such Registrable Securities without any legend
restricting the transferability of the Registrable Securities.

     Buyer will promptly amend or supplement such Registration Statement and the
Prospectus contained therein whenever and to the extent necessary to comply with
the 1933


                                      -25-

<PAGE>   9

Act and any applicable state securities statute or regulation. Buyer will also
provide the Holder of Registrable Securities with as many copies of the
Prospectus contained in any such Registration Statement as it may reasonably
request.

     7.    1934 ACT REGISTRATION

     Buyer shall timely file with the Commission such information as the
Commission may require under Section 13 or 15(d) of the 1934 Act; and in such
event, Buyer shall use its best efforts to take all action pursuant to Rule
144(c) as may be required as a condition to the availability of Rule 144 under
the 1933 Act (or any successor exemptive rule hereinafter in effect) with
respect to such Common Stock. Buyer shall furnish to any holder of Registrable
Securities forthwith upon request (i) a written statement by Buyer as to its
compliance with the reporting requirements of Rule 144(c), (ii) a copy of the
most recent annual or quarterly report of Buyer as filed with the Commission,
and (iii) such other publicly-filed reports and documents as a holder may
reasonably request in availing itself of any rule or regulation of the
Commission allowing a holder to sell any such Registrable Securities without
registration.

     8.    SHAREHOLDER INFORMATION

     It shall be a condition precedent to the obligations of Buyer to take any
action pursuant to this Agreement that all Holders shall furnish to Buyer such
information regarding themselves, the Registrable Securities held by them and
the intended method of disposition of such Registrable Securities as shall be
reasonably required to effect the registration of their Registrable Securities
and to execute such documents in connection with such registration as Buyer may
reasonably request. In addition, each Holder agrees to dispose of any
Registrable Securities included in any registration only in accordance with the
plan of distribution described in the Registration Statement.

     9.    INDEMNIFICATION AND CONTRIBUTION

     In the event any Registrable Securities are included in a Registration
Statement under this Agreement:

          (a) In the event of any registration of any Registrable Securities
under the 1933 Act pursuant to this Agreement, then to the extent permitted by
law, Buyer will indemnify and hold harmless each Seller and any of his agents,
and any underwriter (as defined in the 1933 Act) for such Seller and each
person, if any, who controls such Seller or underwriter within the meaning of
the 1933 Act or the 1934 Act, against any losses, claims, damages, liabilities
and expenses (including reasonable attorneys fees) (joint or several) to which
they may become subject under the 1933 Act, the 1934 Act or other federal or
state law, insofar as such losses, claims, damages, liabilities and expenses
(including reasonable attorneys fees (or actions in respect thereof) arise out
of or are based upon any of the following statements, omissions or violations
(the following are collectively referred to as a


                                      -26-

<PAGE>   10

"VIOLATION"): (i) any untrue statement or alleged untrue statement of a material
fact contained in such Registration Statement, including any preliminary
prospectus or final prospectus contained therein or any amendments or
supplements thereto; (ii) the omission or alleged omission to state therein a
material fact required to be stated therein, or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading; or (iii) any violation or alleged violation by Buyer of the 1933
Act, the 1934 Act, any state securities law or any rule or regulation
promulgated under the 1933 Act, the 1934 Act or any state securities law; and
Buyer will reimburse each such Seller, his agent, underwriter or controlling
person for any reasonable legal or other expenses reasonably incurred by them in
connection with investigating or defending any such loss, claim, damage,
liability or action. Notwithstanding anything contained in this Agreement to the
contrary, the indemnity agreement contained in this Section 9 shall not apply to
amounts paid in settlement of any such loss, claim, damage, liability or action
if such settlement is effected without the consent of Buyer (which consent shall
not be unreasonably withheld, conditioned or delayed), nor shall Buyer be liable
in any such case for any such loss, claim, damage, liability or action to the
extent that it arises out of or is based upon a Violation which occurs in
reliance upon and in conformity with written information furnished to Buyer
expressly for use in connection with such registration by any such Seller,
underwriter or controlling person.

          (b) In the event of any registration of any Registrable Securities
under the 1933 Act pursuant to this Agreement, then to the extent permitted by
law, each Seller will indemnify and hold harmless Buyer, each of its officers,
directors, agents or employees, any underwriter (as defined in the 1933 Act) and
each person, if any, who controls Buyer or any underwriter for Buyer within the
meaning of the 1933 Act or the 1934 Act, and any other Seller or any of his
agents, underwriter or any person who controls such Seller within the meaning of
the 1933 Act or the 1934 Act, against any losses, claims, damages or liabilities
and expenses (including reasonable attorneys fees) (joint or several) to which
Buyer or any such director, officer, partner, agent, employee, controlling
person or underwriter, or other such Seller or agent, underwriter or controlling
person may become subject, under the 1933 Act, the 1934 Act or other federal or
state law, insofar as such losses, claims, damages, liabilities and expenses
(including reasonable attorneys fees) (or actions in respect thereto) arise out
of or are based upon any Violation, in each case to the extent (and only to the
extent) that such Violation occurs in reliance upon and in conformity with
written information furnished by such Seller expressly for use in connection
with such registration; and each such Seller will reimburse any reasonable legal
or other expenses reasonably incurred by Buyer or any such director, officer,
partner, agent, employee, controlling person or underwriter, other Seller,
agent, underwriter or controlling person in connection with investigating or
defending any such loss, claim, damage, liability or action. Notwithstanding
anything contained in this Agreement to the contrary, the indemnity agreement
contained in this Section 9(b) shall not apply to amounts paid in settlement of
any such loss, claim, damage, liability or action if such settlement is effected
without the consent of the Seller (which consent shall not be unreasonably
withheld, conditioned or delayed) provided further, that the aggregate liability
of each Seller in connection with any sale of Registrable Securities pursuant to
a Registration


                                      -27-

<PAGE>   11

Statement in which a Violation occurred shall be limited to the net proceeds
from such sale received by such Seller.

          (c) Promptly after receipt by an indemnified party under this Section
9 of notice of the commencement of any action (including any governmental
action), such indemnified party will, if a claim in respect thereof is to be
made against any indemnifying party under this Section 9, deliver to the
indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume the defense thereof with counsel mutually
satisfactory to the parties; provided, however, that an indemnified party shall
have the right to retain its own counsel, with the fees and expenses to be paid
by the indemnifying party, if representation of such indemnified party by the
counsel retained by the indemnifying party would be inappropriate due to actual
or potential differing or conflicting interests between such indemnified party
and any other party represented by such counsel in such proceeding. The failure
to deliver written notice to the indemnifying party within a reasonable time of
the commencement of any such action, to the extent prejudicial to its ability to
defend such action, shall relieve such indemnifying party of liability to the
indemnified party under this Section 9 to the extent of such prejudice, but the
omission so to deliver written notice to the indemnifying party will not relieve
it of any liability that it may have to any indemnified party otherwise than
under this Section 9.

          (d) If recovery is not available under the foregoing indemnification
provisions of this Section 9, for any reason other than as specified therein,
the parties entitled to indemnification by the terms thereof shall be entitled
to contribution to liabilities and expenses in such proportion as is appropriate
to reflect the relative fault of the indemnifying parties and the indemnified
parties, except to the extent that contribution is not permitted under Section
11(f) of the 1933 Act. The relative fault of such indemnifying party and
indemnified party shall be determined by reference to, among other things, the
parties' relative knowledge and access to information concerning the matter with
respect to which the claim was asserted, the opportunity to correct and prevent
any statement or omission and any other equitable considerations appropriate
under the circumstances, including, without limitation, whether any untrue
statement or alleged untrue statement of a material fact or omission or alleged
omission to state a material fact relates to information supplied by Buyer, on
the one hand, or by the Seller, on the other hand. Buyer and the Seller of the
Registrable Securities covered by such Registration Statement agree that it
would not be equitable if the amount of such contribution were determined by pro
rata or per capita allocation. No Seller of Registrable Securities covered by
such Registration Statement or person controlling such Seller shall be obligated
to make any contribution hereunder which in the aggregate exceeds the net
proceeds from the Registrable Securities sold by such Seller, less the aggregate
amount of any damages which such Seller and its controlling persons have
otherwise been required to pay in respect of the same claim or any substantially
similar claim. The obligations of such Sellers to contribute are


                                      -28-

<PAGE>   12

several in proportion to their respective ownership of the Registrable
Securities covered by such Registration Statement and not joint.

     10.   NON-ASSIGNABILITY OF REGISTRATION RIGHTS

     The rights to cause Buyer, or its successors or assigns, to register
Registrable Securities pursuant to this Agreement are reserved solely for the
use and benefit of the Holders and may not be assigned or transferred by the
Holders to any other person; PROVIDED, HOWEVER, that any Holder who is a natural
person may transfer Registrable Securities to any member of the immediate family
of a Holder who is a natural person, or any trust or other fiduciary arrangement
for the benefit of such family member.

     11.   MISCELLANEOUS

     11.1  AMENDMENTS AND WAIVERS

     Any provision of this Agreement may be amended and the observance thereof
may only be waived (either generally or in a particular instance and either
retroactively or prospectively), with the written consent of Buyer and the
Holders of at least two thirds of the Registrable Securities then outstanding.
Any amendment or waiver effected in accordance with this Section shall be
binding upon each Holder of Registrable Securities at the time outstanding, each
future Holder of Registrable Securities, and Buyer.

     11.2  NOTICES

     Any notice required or permitted to be given hereunder shall be in writing
and shall be deemed given at the opening of business on the first Business Day
following the time (a) delivery is made, if by hand delivery, (b) the facsimile
is successfully transmitted, if by telecopier or facsimile machine, or (c) the
Business Day after such notice is deposited with a reputable overnight courier
service, postage prepaid, for next-day delivery, addressed as respectively set
forth below or to such other address as any party shall have previously
designated by such a notice:

     To Buyer at:

                     Forrester Research, Inc.
                     400 Technology Square
                     Cambridge, Massachusetts  02139
                     Attn: Chief Financial Officer
                     Facsimile No.:  (617) 613-5643


                                      -29-

<PAGE>   13

     With a copy to:

                     Ropes & Gray
                     One International Place
                     Boston, Massachusetts  02110
                     Attn:  Ann L. Milner, Esq.
                     Facsimile No.:  (617) 951-7050

     To any Shareholder:

                     To such Shareholder at the address
                     specified for such Shareholder on
                     SCHEDULE A hereto.

     With a copy to:

                     Stephen Hermer, Esq.
                     Olswang
                     90 Longacre
                     London WC2E 9TT
                     England
                     Facsimile No.: 0171-208-8800

     11.3  GOVERNING LAW

     This Agreement shall for all purposes be governed by and construed in
accordance with the internal laws of The Commonwealth of Massachusetts with
respect to the enforceability of contracts and in accordance with the United
States securities laws with respect to matters involving securities laws
regarding the registration of the Registrable Shares, both without regard to
conflicts-of-laws principles. The parties hereto agree to submit to the
jurisdiction of the federal and state courts of The Commonwealth of
Massachusetts with respect to the breach or interpretation of this Agreement or
the enforcement of any and all rights, duties, liabilities, obligations, powers
and other relations between parties arising under this Agreement.

     11.4  SEVERABILITY

     If one or more provisions of this Agreement are held to be unenforceable
under applicable law, such provision shall be deemed to be excised from this
Agreement, and the remainder of this Agreement shall be interpreted as if such
provision were so excised and shall be enforceable in accordance with its
remaining terms.

                                      -30-

<PAGE>   14

     11.5  COUNTERPARTS

     This Agreement may be executed in two or more counterparts, each of which
shall be deemed to be an original and all of which together shall constitute one
and the same instrument.

     11.6  BINDING EFFECT

     This Agreement shall be binding upon and inure to the benefit of the
successors and permitted assignees of each of the parties.


                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]






                                      -31-


<PAGE>   15


     IN WITNESS WHEREOF, the parties have executed this Registration Rights
Agreement as of the date first written above.

                                    FORRESTER RESEARCH, INC.


                                         /s/ Susan M. Whirty
                                     By: _________________________________
                                         Name: Susan M. Whirty
                                         Title: Chief Financial Officer


                                     SHAREHOLDERS


                                     Neil Bradford

                                     /s/ Neil Bradford
                                     ______________________________________



                                     William Reeve

                                     /s/ William Reeve
                                     ______________________________________





                                      -32-


<PAGE>   16


                                   SCHEDULE A



     SHAREHOLDER
     -----------

1.    Neil Bradford
      [Address]

2.    William Reeve






                                      -33-

<PAGE>   1



                                                                       Exhibit 5

                             OPINION OF ROPES & GRAY


                                December 17, 1999




Forrester Research, Inc.
400 Technology Square
Cambridge, Massachusetts  02139

Ladies and Gentlemen:

       This opinion is furnished to you in connection with a registration
statement on Form S-3 (the "Registration Statement"), filed with the Securities
and Exchange Commission (the "Commission") under the Securities Act of 1933, as
amended, covering the offering and possible future sale by certain holders of
100,426 shares of common stock, $0.01 par value (the "Shares") of Forrester
Research, Inc. (the "Company").

       We have acted as counsel for the Company in connection with the
preparation and filing of the Registration Statement. For purposes of our
opinion, we have examined and relied upon such documents, records, certificates
and other instruments as we have deemed necessary. We have assumed the
genuineness and authenticity of all documents submitted to us as originals of
all documents submitted to us as copies.

       We express no opinion as to the applicability of, compliance with or
effect of federal law or the law of any jurisdiction other than The Commonwealth
of Massachusetts and the General Corporation Law of the State of Delaware.

       Based upon the foregoing, we are of the opinion that the Shares have been
duly authorized, validly issued and are fully paid and nonassessable.

       We understand that this opinion is to be used in connection with the
Registration Statement and hereby consent to the filing of this opinion as part
of the Registration Statement and to the use of our name therein and in the
related prospectus under the caption "Legal Opinions."




                                      -34-


<PAGE>   2




       This opinion is to be used only in connection with the offer and sale of
the Shares while the Registration Statement is in effect.

                                                     Very truly yours,


                                                     /s/ Ropes & Gray

                                                     Ropes & Gray








                                      -35-



<PAGE>   1



                                                                    Exhibit 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS


         As independent public accountants, we hereby consent to the use of our
report (and to all references to our firm) included in or made a part of this
registration statement.


/s/  Arthur Andersen LLP

Boston, Massachusetts
December 17, 1999









                                      -36-




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