Document:

<PAGE>

                          LOAN DOCUMENT MODIFICATION AGREEMENT
                           NUMBER 8; DATED AS OF MAY 20, 2000

     LOAN DOCUMENT MODIFICATION AGREEMENT dated as of May 20, 2000 (this
"Agreement") by and among SILICON VALLEY BANK (the "Bank"), a
California-chartered bank with its principal place of business located at
3003 Tasman Drive, Santa Clara, California 95054, and with a loan production
office located at 40 William Street, Wellesley, Massachusetts 02481, doing
business under the name "Silicon Valley East," LIONBRIDGE TECHNOLOGIES
HOLDINGS B.V., a company with limited liability, incorporated in the
Netherlands and having a principal place of business located at The Sinus
Building, Overschiestraat 55, 1062 HN, Amsterdam, The Netherlands, LIONBRIDGE
TECHNOLOGIES B. V., a company with limited liability, incorporated in the
Netherlands and having a principal place of business located at the same
address (each a "Borrower" and collectively, the "Borrowers") and LIONBRIDGE
TECHNOLOGIES, INC., a Delaware company with its principal place of business
located at 950 Winter Street, Suite 2410, Waltham, Massachusetts 02451 (the
"Parent Guarantor").

     1.     REFERENCE TO EXISTING LOAN DOCUMENTS.

     Reference is hereby made to that Loan Agreement dated as of September
26, 1997 among the Bank and the Borrowers, as amended by Loan Documentation
Modification Agreement No. 1 dated as of May 21, 1998, as further amended by
Loan Document Modification Agreement. No. 2 dated as of February 25,
1999, Loan Document Modification Agreement No 3 dated as of May 20, 1999,
Loan Document Modification Agreement No. 4 dated as of July 16, 1999, Loan
Document Modification Agreement No. 5 dated as of September 20, 1999, Loan
Document Modification Agreement No. 6 dated as of December 20, 1999 and Loan
Document Modification Agreement No. 7 dated as of March 20, 2000 (with the
attached schedules and exhibits, and as the same may hereafter be further
amended, modified, supplemented, extended or restated from time to time, the
"Loan Agreement") and the Loan Documents referred to therein, including
without limitation that certain Amended and Restated Promissory Note of the
Borrowers dated as of March 20, 2000 in the principal amount of $8,000,000
(the "Existing Note") and the Security Documents referred to therein, and
also including that certain Amended and Restated Guarantee of the Parent
Guarantor dated as of May 21, 1998 in favor of the Bank (the "Parent
Guarantee") Unless otherwise defined herein, capitalized terms used in this
Agreement shall have the same respective meanings as set forth in the Loan
Agreement.

     2.     EFFECTIVE DATE.

     This Agreement shall become effective as of May 20, 2000 (the "Effective
Date"), provided that the Bank shall have received the following on or before
June 9, 2000 and provided further, however, in no event shall this Agreement
become effective until signed by an officer of the Bank in California:

            a.     two copies of this Agreement, duly executed by each
Borrower and the Parent Guarantor;

            b.     an amended and restated promissory note in the form
enclosed herewith (the "Amended Note"), duly executed by the Borrowers;

<PAGE>
            c.     the attached consents of affiliated entities who have
previously furnished guaranties in favor of the Bank of the obligations of
the Borrowers, duly executed by officers thereof;

            d.     payment of the Bank's facility fee specified below; and

            e.     such other documents, and completion of such other
matters, as the Bank may reasonably request in connection with the amendment
of the Loan Agreement, as contemplated hereunder.

       By the signature of its authorized officer below, the Borrowers are
hereby representing that, except as modified in SCHEDULE A attached hereto,
the representations of the Borrowers set forth in the Loan Documents
(including those contained in the Loan Agreement, as amended by this
Agreement) are true and correct as of the Effective Date as if made on and as
of such date. In addition, the Borrowers confirm their authorization as to
the debiting of their account with the Bank in the amount of $6,667 in order
to pay the Bank's facility fee for the period up to and including the
extended Revolving Maturity Date. Finally, the Borrowers (and each guarantor
signing below) agree that, as of the Effective Date, they have no defenses
against their obligations to pay any amounts under the Loan Agreement and the
other Loan Documents.

      3.    DESCRIPTION OF CHANGE IN TERMS.

      As of the Effective Date, the Loan Agreement is modified in the
following respects:

            a.     Section 1.1 of the Loan Agreement is hereby amended by
restating the definition of "Revolving Maturity Date" in its entirety as
follows:

            "Revolving Maturity Date' means July 20, 2000."

            b.     The Loan Agreement and the other Loan Documents are hereby
amended wherever necessary or appropriate to reflect the foregoing change.

      4.    CONTINUING VALIDITY.

      Upon the effectiveness hereof, each reference in each Security
Instrument or other Loan Document to "the Loan Agreement," "thereunder,"
"thereof," "therein" or words of like import referring to the Loan Agreement,
shall mean and be a reference to the Loan Agreement, as amended hereby.
Except as specifically set forth above, the Loan Agreement shall remain in
full force and effect and is hereby ratified and confirmed.

      Each of the other Loan Documents is in full force and effect and is
hereby ratified and confirmed. The amendments and limited waiver set forth
above (i) do not constitute a waiver or modification of any term, condition
or covenant of the Loan Agreement or any other Loan Document, other than as
expressly set forth herein, and (ii) shall not prejudice any rights which the
Bank may now or hereafter have under or in connection with the Loan
Agreement, as modified hereby, or the other Loan Documents, and shall not
obligate the Bank to assent to any further modifications.

<PAGE>

      5.     MISCELLANEOUS.

             a.      This Agreement may be signed in one or more counterparts
each of which taken together shall constitute one and the same document.

             b.      THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS.

             c.      THE BORROWERS ACCEPT FOR THEMSELVES AND IN CONNECTION
WITH THEIR PROPERTIES, UNCONDITIONALLY, THE NONEXCLUSIVE JURISDICTION OF ANY
STATE OR FEDERAL COURT OF COMPETENT JURISDICTION IN THE COMMONWEALTH OF
MASSACHUSETTS IN ANY ACTION, SUIT, OR PROCEEDING OF ANY KIND AGAINST THEM
WHICH ARISES OUT OF OR BY REASON OF THIS AGREEMENT; PROVIDED, HOWEVER, THAT
IF FOR ANY REASON THE BANK CANNOT AVAIL ITSELF OF THE COURTS OF THE
COMMONWEALTH OF MASSACHUSETTS, THEN VENUE SHALL LIE IN SANTA CLARA COUNTY,
CALIFORNIA.

             d.      The Borrowers agree to promptly pay on demand all costs
and expenses of the Bank in connection with the preparation, reproduction,
execution and delivery of this Agreement and the other instruments and
documents to be delivered hereunder, including the reasonable fees and
out-of-pocket expenses of Sullivan & Worcester LLP, special counsel for the
Bank with respect thereto.

                [Remainder of page intentially left blank.]

<PAGE>

      IN WITNESS WHEREOF, the Bank and the Borrowers have caused this
Agreement to be signed under seal by their respective duly authorized
officers as of the date set forth above.

                                       Sincerely,

                                       SILICON VALLEY EAST, a Division
                                          of Silicon Valley Bank

                                       By:  /s/ Andrew H. Tsao
                                            ---------------------
                                            Andrew H. Tsao
                                            Senior Vice President

                                       SILICON VALLEY BANK

                                       BY:  /s/ Maggie Garcia
                                            ---------------------
                                            Name: Maggie Garcia
                                            Title:
                                            (signed in Santa Clara, CA)

                                       BORROWERS:

                                       LIONBRIDGE TECHNOLOGIES HOLDINGS B.V.

                                       By:  /s/ Rory J. Cowan
                                            -----------------
                                            Rory J. Cowan
                                            Managing Director

                                       LIONBRIDGE TECHNOLOGIES B.V.

                                       By:  /s/ Rory J. Cowan
                                            -----------------
                                            Rory J. Cowan
                                            Managing Director

                                       PARENT GUARANTOR:

                                       LIONBRIDGE TECHNOLOGIES, INC.

                                       By:  /s/ Rory J. Cowan
                                            -----------------
                                            Rory J. Cowan
                                            Chief Executive Officer<PAGE>

                                LIGHTBRIDGE, INC.

                        1996 EMPLOYEE STOCK PURCHASE PLAN

         1.       PURPOSE AND EFFECTIVE DATE.

                  The Lightbridge, Inc. 1996 Employee Stock Purchase Plan (the
"Plan") is intended to provide a method whereby employees of Lightbridge, Inc.
(the "Company") will have an opportunity to acquire an ownership interest (or
increase an existing ownership interest) in the Company through the purchase of
shares of the Common Stock of the Company. It is the intention of the Company
that the Plan qualify as an "employee stock purchase plan" under Section 423 of
the Internal Revenue Code of 1986, as amended (the "Code"). The provisions of
the Plan shall, accordingly, be construed so as to extend and limit
participation in a manner consistent with the requirements of that section of
the Code. The Plan shall become effective upon the closing of the Company's
initial public offering of shares of Common Stock.

         2.       DEFINITIONS.

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

                  (b) "Code" shall have the meaning set forth in Paragraph 1.

                  (c) "Committee" means the Compensation Committee of the Board.

                  (d) "Common Stock" means the common stock, par value $.01 per
share, of the Company.

                  (e) "Company" shall also include any Subsidiary (as
hereinafter defined) of Lightbridge, Inc. designated as a participant in the
Plan by the Board, unless the context otherwise requires.

                  (f) "Compensation" means, for the purpose of any Offering
pursuant to the Plan, base pay in effect as of the Offering Commencement Date
(as hereinafter defined). Compensation shall not include any deferred
compensation other than contributions by an individual through a salary
reduction agreement to a cash or deferred plan pursuant to Section 401(k) of the
Code or to a cafeteria plan pursuant to Section 125 of the Code.

                  (g) "Employee" means any person who is customarily employed by
the Company for more than 20 hours per week and more than five months in any
calendar year.

                  (h) "Offering" shall have the meaning set forth in
Paragraph 4.

<PAGE>

                  (i) "Offering Commencement Date" shall have the meaning set
forth in Paragraph 4.

                  (j) "Offering Termination Date" shall have the meaning set
forth in Paragraph 4.

                  (k) "Plan" shall have the meaning set forth in Paragraph 1.

                  (l) "Subsidiary" shall mean any present or future corporation
which is or would constitute a "subsidiary corporation" as that term is defined
in Section 424(f) of the Code.

         3.       ELIGIBILITY.

                  (a) Participation in the Plan is completely voluntary.
Participation in any one or more of the Offerings under the Plan shall neither
limit, nor require, participation in any other Offering (as hereinafter
defined).

                  (b) Each employee of the Company shall be eligible to
participate in the Plan on the first Offering Commencement Date, as hereinafter
defined, following the completion of six months of continuous service with the
Company. Notwithstanding the foregoing, no employee shall be granted an option
under the Plan:

                           (i) if, immediately after the grant, such employee
would own stock, and/or hold outstanding options to purchase stock, possessing
5% or more of the total combined voting power or value of all classes of stock
of the Company or any Subsidiary; for purposes of this Paragraph, the rules of
Section 424(d) of the Code shall apply in determining the stock ownership of any
employee;

                           (ii) which permits his rights to purchase stock under
all Section 423 employee stock purchase plans of the Company and its
Subsidiaries to exceed $25,000 of the fair market value of the stock (determined
at the time such option is granted) for each calendar year in which such option
is outstanding; for purposes of this Paragraph, the rules of Section 423(b)(8)
of the Code shall apply; or

                           (iii) if such employee is an officer of the Company,
but only if such employee is a "highly compensated employee" within the meaning
of Section 414(q) of the Code.

         4.       OFFERING DATES.

                  The right to purchase stock hereunder shall be made available
by a series of six month offerings (the "Offering" or "Offerings") to employees
eligible in accordance with Paragraph 3 hereof. The Committee will, in its
discretion, determine the applicable date of commencement ("Offering
Commencement Date") and termination date ("Offering Termination

                                      -2-

<PAGE>

Date") for each Offering. Participation in any one or more of the Offerings
under the Plan shall neither limit, nor require, participation in any other
Offering.

         5.       PARTICIPATION.

                  Any eligible employee may become a participant by completing a
payroll deduction authorization form provided by the Company and filing it with
the Company's Treasurer 20 days prior to each applicable Offering Commencement
Date, as determined by the Committee pursuant to Paragraph 4.

         6.       PAYROLL DEDUCTIONS.

                  (a) At the time a participant files an authorization for a
payroll deduction, the participant shall elect to have deductions made from his
or her pay on each payday during any Offering in which he or she is a
participant, at a specified percentage of his or her Compensation as determined
on the applicable Offering Commencement Date; said percentage shall be in
increments of one percent up to a maximum percentage of six percent.

                  (b) Payroll deductions for a participant shall commence on the
Offering Commencement Date when the applicable authorization for a payroll
deduction becomes effective and shall end on the Offering Termination Date of
the Offering to which such authorization is applicable, unless sooner terminated
by the participant as provided in Paragraph 9.

                  (c) All payroll deductions made for a participant shall be
credited to his or her account under the Plan. A participant may not make any
separate cash payment into such account.

         7.       GRANTING OF OPTION.

                  (a) Except as set forth in Paragraph 7(c) hereof, on the
Offering Commencement Date of each Offering, a participating employee shall be
deemed to have been granted an option to purchase a maximum number of shares of
the Common Stock equal to an amount determined as follows: (i) 85% of the market
value per share of the Common Stock on the applicable Offering Commencement Date
shall be divided into the percentage of the employee's Compensation which he or
she has elected to have withheld (multiplied by the employee's Compensation over
the Offering period) multiplied by (ii) two. Such market value per share of the
Common Stock shall be determined as provided in clause (i) of Paragraph 7(b).

                  (b) The option price of the Common Stock purchased with
payroll deductions made during each such Offering for a participant therein
shall be the lower of:

                           (i) 85% of the average of the bid and the asked
prices as reported by Nasdaq in the Wall Street Journal, or, if the Common Stock
is designated as a national market security by the National Association of
Securities Dealers, Inc. ("NASD"), the last trading price

                                       -3-

<PAGE>

of the Common Stock as reported by the Nasdaq National Market System in the Wall
Street Journal, or, if the Common Stock is listed on an exchange, the closing
price of the Common Stock on the exchange on the Offering Commencement Date
applicable to such Offering (or on the next regular business date on which
shares of the Common Stock shall be traded, in the event that no shares of the
Common Stock have been traded on the Offering Commencement Date); or if the
Common Stock is not quoted on Nasdaq, not designated as a Nasdaq national market
security and not listed on an exchange, 85% of the fair market value on the
Offering Commencement Date as determined by the Committee; and

                           (ii) 85% of the average of the bid and the asked
prices as reported by Nasdaq in the Wall Street Journal, or, if the Common Stock
is designated as a national market security by the NASD, the last trading price
of the Common Stock as reported by the Nasdaq National Market System in the Wall
Street Journal, or, if the Common Stock is listed on an exchange, the closing
price of the Common Stock on the exchange on the Offering Termination Date
applicable to such Offering (or on the next regular business date on which
shares of the Common Stock shall be traded, in the event that no shares of the
Common Stock shall have been traded on the Offering Termination Date); or if the
Common Stock is not quoted on Nasdaq, not designated as a Nasdaq national market
security and not listed on an exchange, 85% of the fair market value on the
Offering Termination Date as determined by the Committee.

         8.       EXERCISE OF OPTION.

                  (a) Unless a participant gives written notice to the Treasurer
of the Company as hereinafter provided, his or her option for the purchase of
Common Stock with payroll deductions made during any Offering will be deemed to
have been exercised automatically on the Offering Termination Date applicable to
such Offering for the purchase of the number of full shares of Common Stock
which the accumulated payroll deductions in his or her account at that time will
purchase at the applicable option price (but not in excess of the number of
shares for which options have been granted to the employee, pursuant to
Paragraph 7(a)), and any excess in his account at that time will be returned to
the participant, without interest.

                  (b) Fractional shares will not be issued under the Plan and
any accumulated payroll deductions which would have been used to purchase
fractional shares shall be automatically carried forward to the next Offering
unless the participant elects, by written notice to the Treasurer of the
Company, to have the excess cash returned to the participant.

         9.       WITHDRAWAL AND TERMINATION.

                  (a) Prior to the Offering Termination Date for an Offering,
any participant may withdraw the payroll deductions credited to his or her
account under the Plan for such Offering by giving written notice to the
Treasurer of the Company. All of the participant's payroll deductions credited
to such account will be paid to the participant promptly after receipt of notice
of withdrawal, without interest, and no future payroll deductions will be made
from his or her pay

                                      -4-

<PAGE>

during such Offering. The Company will treat any attempt to borrow by a
participant on the security of accumulated payroll deductions as an election to
withdraw such deductions.

                  (b) Except as set forth in Paragraphs 6(d) and 7(c), a
participant's election not to participate in, or withdrawal from, any Offering
will not have any effect upon his or her eligibility to participate in any
succeeding Offering or in any similar plan which may hereafter be adopted by the
Company.

                  (c) Upon termination of the participant's employment for any
reason, including retirement but excluding death, the payroll deductions
credited to his or her account will be returned to the participant, or, in the
case of his or her death, to the person or persons entitled thereto under
Paragraph 13.

                  (d) Upon termination of the participant's employment because
of death, his or her beneficiary (as defined in Paragraph 13) shall have the
right to elect, by written notice given to the Company's Treasurer prior to the
expiration of a period of 90 days commencing with the date of the death of the
participant, either:

                           (i) to withdraw all of the payroll deductions
credited to the participant's account under the Plan; or

                           (ii) to exercise the participant's option for the
purchase of stock on the Offering Termination Date next following the date of
the participant's death for the purchase of the number of full shares which the
accumulated payroll deductions in the participant's account at the date of the
participant's death will purchase at the applicable option price (subject to the
limitation contained in Paragraph 7(a)), and any excess in such account will be
returned to said beneficiary. In the event that no such written notice of
election shall be duly received by the office of the Company's Treasurer, the
beneficiary shall automatically be deemed to have elected to withdraw the
payroll deductions credited to the participant's account at the date of the
participant's death and the same will be paid promptly to said beneficiary.

         10.      INTEREST.

                  No interest will be paid or allowed on any money paid into the
Plan or credited to the account of any participating employee.

         11.      STOCK.

                  (a) The maximum number of shares of Common Stock available for
issuance and purchase by employees under the Plan, subject to adjustment upon
changes in capitalization of the Company as provided in Paragraph 16, shall be
200,000 shares of Common Stock, $.01 par value per share, of the Company. If the
total number of shares for which options are exercised on any Offering
Termination Date in accordance with Paragraph 8 exceeds the number of shares

                                      -5-

<PAGE>

that remain available for issuance and purchase by employees under the Plan, the
Company shall make a pro rata allocation of the shares available for delivery
and distribution in an equitable manner, with the balances of payroll deductions
credited to the account of each participant under the Plan returned to each
participant.

                  (b) The participant will have no interest in the stock covered
by his or her option until such option has been exercised.

         12.      ADMINISTRATION.

                  The Plan shall be administered by the Committee. The
interpretation and construction of any provision of the Plan and adoption of
rules and regulations for administering the Plan shall be made by the Committee.
Determinations made by the Committee with respect to any matter or provision
contained in the Plan shall be final, conclusive and binding upon the Company
and upon all participants, their heirs or legal representatives. Any rule or
regulation adopted by the Committee shall remain in full force and effect unless
and until altered, amended, or repealed by the Committee.

         13.      DESIGNATION OF BENEFICIARY.

                  A participant shall file with the Treasurer of the Company a
written designation of a beneficiary who is to receive any Common Stock and/or
cash under the Plan. Such designation of beneficiary may be changed by the
participant at any time by written notice. Upon the death of a participant and
upon receipt by the Company of proof of the identity and existence of a
beneficiary validly designated by the participant under the Plan, the Company
shall deliver such Common Stock and/or cash to such beneficiary. In the event of
the death of a participant and in the absence of a beneficiary validly
designated under the Plan who is living at the time of such participant's death,
the Company shall deliver such Common Stock and/or cash to the executor or
administrator of the estate of the participant. No beneficiary shall, prior to
the death of the participant by whom he or she has been designated, acquire any
interest in the Common Stock and/or cash credited to the participant under the
Plan.

         14.      TRANSFERABILITY.

                  Neither payroll deductions credited to a participant's account
nor any rights with regard to the exercise of an option or to receive Common
Stock under the Plan may be assigned, transferred, pledged, or otherwise
disposed of in any way by the participant other than by will or the laws of
descent and distribution. Any such attempted assignment, transfer, pledge, or
other disposition shall be without effect, except that the Company may treat
such act as an election to withdraw funds in accordance with Paragraph 8(b).

                                      -6-

<PAGE>

         15.      USE OF FUNDS.

                  All payroll deductions received or held by the Company under
the Plan may be used by the Company for any corporate purpose, and the Company
shall not be obligated to segregate such payroll deductions.

         16.      EFFECT OF CHANGES OF COMMON STOCK.

                  If at any time after the effective date of the Plan the
Company shall subdivide or reclassify the Common Stock which has been or may be
optioned under the Plan, or shall declare thereon any dividend payable in shares
of such Common Stock, or shall take any other action of a similar nature
affecting such Common Stock, then the number and class of shares of Common Stock
which may thereafter be optioned (in the aggregate and to any participant) shall
be adjusted accordingly and in the case of each option outstanding at the time
of any such action, the number and class of shares which may thereafter be
purchased pursuant to such option and the option price per share shall be
adjusted to such extent as may be determined by the Committee, following
consultation with the Company's independent public accountants and counsel, to
be necessary to preserve the rights of the holder of such option.

         17.      AMENDMENT OR TERMINATION.

                  The Board may at any time terminate or amend the Plan. No such
termination shall affect options previously granted, nor may an amendment make
any change in any option theretofore granted which would adversely affect the
rights of any participant holding options under the Plan.

         18.      NOTICES.

                  All notices or other communications by a participant to the
Company under or in connection with the Plan shall be deemed to have been duly
given when received by the Treasurer of the Company.

         19.      MERGER OR CONSOLIDATION.

                  If the Company shall at any time merge into or consolidate
with another corporation, the holder of each option then outstanding will
thereafter be entitled to receive at the next Offering Termination Date, upon
the exercise of such option and for each share as to which such option shall be
exercised, the securities or property which a holder of one share of the Common
Stock was entitled to upon and at the time of such merger or consolidation. In
accordance with this Paragraph and Paragraph 16, the Committee shall determine
the kind and amount of such securities or property which such holder of an
option shall be entitled to receive. A sale of all or substantially all of the
assets of the Company shall be deemed a merger or consolidation for the
foregoing purposes.

                                      -7-

<PAGE>

         20.      APPROVAL OF STOCKHOLDERS.

                  The Plan is subject to the approval of the stockholders of the
Company by written consent or at their next annual meeting or at any special
meeting of the stockholders for which one of the purposes of such a special
meeting shall be to act upon the Plan.

         21.      GOVERNMENTAL AND OTHER REGULATIONS.

                  The Plan, and the grant and exercise of the rights to purchase
shares hereunder, and the Company's obligation to sell and deliver shares upon
the exercise of rights to purchase shares, shall be subject to all applicable
federal, state and foreign laws, rules and regulations, and to such approvals by
any regulatory or governmental agency as may, in the opinion of counsel for the
Company, be required. The Plan shall be governed by, and construed and enforced
in accordance with, the provisions of Sections 421, 423 and 424 of the Code and
the substantive laws of The Commonwealth of Massachusetts. In the event of any
inconsistency between such provisions of the Code and any such laws, said
provisions of the Code shall govern to the extent necessary to preserve the
favorable federal income tax treatment afforded employee stock purchase plans
under Section 423 of the Code.

                            *          *          *

                                      -8-

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