Document:

<PAGE>
                                                                  Exhibit 10.22

                AMENDMENT NO. 4 TO MANAGEMENT SERVICES AGREEMENT

      FOR GOOD AND VALUABLE CONSIDERATION, the receipt and sufficiency of which
are hereby acknowledged, the Management Services Agreement ("MSA") dated
November 29, 2001, effective as of February 29, 2000, between PEARSON PLC and
INTERACTIVE DATA CORPORATION, as amended, is hereby further amended effective as
of September 16, 2004, (the "Effective Date"), as follows:

  1.  Schedule 1 and Schedule 17 are deleted in their entirety and replaced with
      revised Schedule 17 "Financial Accounting Services", a copy of which is
      attached hereto and made a part hereof.

  2.  Schedule 5 is amended by deleting the reference to FTMarketwatch.com.

  3.  Schedule 6 is deleted in its entirety and replaced with revised Schedule 6
      "Computer and Accounting System Support Services", a copy of which is
      attached hereto and made a part hereof.

  4.  Schedules 2, 16, 23, 24, 25, 27, 32 are deleted in their entirety.

  5.  Schedule 34 is deleted in its entirety and replaced with revised Schedule
      34, a copy of which is attached hereto and made a part hereof.

  6.  Schedule 37 is terminated effective as of December 31, 2004.

  7.  Schedules 42 and 43, copies of which are attached hereto, are added as new
      Schedules to the MSA.

      Except as hereby expressly amended, the MSA is in all other respects
ratified and confirmed. This Amendment shall be subject to all of the terms and
conditions of the MSA. Except as hereby amended, the MSA is in all other
respects ratified and confirmed.

                  [Remainder of Page Intentionally Left Blank]
<PAGE>
      IN WITNESS WHEREOF, the parties hereto have duly executed this Amendment
as of the Effective Date.

                                       PEARSON PLC

                                       By:
                                          ---------------------------------
                                          Name:
                                          Title:

                                       INTERACTIVE DATA
                                         CORPORATION

                                       By:
                                          ---------------------------------
                                          Name:
                                          Title:
<PAGE>
                                   SCHEDULE 6
                 COMPUTER AND ACCOUNTING SYSTEM SUPPORT SERVICES
                            (MODIFIED SEPTEMBER 2004)

Service Provider:    Financial Times Group Limited (UK) ("FT")

Service Recipient:   FT Interactive Data (Europe) Limited ("FT Interactive
                     (Europe)")

Service Description: FT will provide FT Interactive (Europe) with the following
                     computer and accounting system support services:

                     1.  Provide support of SUN Accounts, SUN Business,
                         Recurring Invoicing, Combined Records, Debtor
                         Management, Vision Excel, Collect, Hyperion PRIME,
                         Dbase, Mercury applications.

                     2.  Provide helpdesk facilities via telephone or email

                     3.  Provide necessary upgrades to existing software

                     4.  Perform all application repairs and maintenance

                     5.  Perform a level of ad hoc systems-related project work,
                         subject to support and group development requirements.

                     6.  Provide Oracle, Unix, NT and Citrix support for FT
                         Interactive Data (Europe) to access the SUN and Vision
                         database application and Citrix servers.

                     7.  Provide backup for DoL production.

                     8.  Provide access to FT workstation for use of BACs system
                         for payments

Primary Contacts:    Head of Finance Systems, Financial Times Limited, Number
                     One Southwark Bridge, London, SE1 9DL, England

                     European Finance Director, FT Interactive Data (Europe)
                     Limited, Fitzroy House, 13-17 Epworth Street, London, EC2A
                     4DL, England

Fees:                119,899 GBP

Service Period:      Commencing February 29, 2004, as revised August 2004 and
                     continuing thereafter until such time as the service is
                     terminated in accordance with the terms of the Agreement

Notice Period for    1 year.
Termination:
<PAGE>
                                   SCHEDULE 17
                          FINANCIAL ACCOUNTING SERVICES
                            (MODIFIED SEPTEMBER 2004)

Service Provider:    Financial Times Group Limited (UK) ("FT")

Service Recipient:   FT Interactive Data (Europe) Limited ("FT Interactive
                     (Europe)")

Service Description: FT will provide FT Interactive (Europe) with the following
                     financial accounting services:

                     1.  Cashiering Services

                         (a)  Banking

                              (i)   Cheques and cash received will be written up
                                    into banking deposit book

                              (ii)  Cashier will ensure that all cheques and
                                    cash are banked within 24 hours of receipt

                         (b)  Reconciling and Posting

                              (i)   Reconcile BACS remittance advice received in
                                    post to bank statement daily; pass all
                                    details to sales ledger each day

                              (ii)  Reconcile Direct Debits per the bank
                                    statement to nominal ledger and pass details
                                    to purchase ledger each day

                              (iii) Transmit weekly all PDQI payment requests
                                    and pass all information to sales ledger
                                    when monies are received

                              (iv)  Using electronic statements printed from
                                    Hexagon, post all electronic receipts to
                                    relevant accounts daily

                              (v)   Reconcile all bank accounts weekly and
                                    inform all relevant parties by email of any
                                    outstanding amounts

                         (c)  Queries: Liaise with HSBC Bank Plc regarding any
                              queries that arise on bank statements

                         (d)  Purchase Foreign Currency: Receive approved
                              paperwork from managers requesting foreign
                              currency for trips abroad and ensure that they
                              receive funds on time

                     2.  Monthly Financial Reporting

                         (a)  Fixed assets reviewed and analyzed

                              (i)   Agree fixed assets posted to SUN to the
                                    nominal ledger and post differences

                              (ii)  Run monthly depreciation based on group
                                    policy

                              (iii) Prepare all journals relating to disposals
                                    and inter-company transfers of fixed assets

                              (iv)  Prepare all fixed assets tax analysis and
                                    financial reporting schedules for the year
                                    end

                              (v)   Provide ad hoc information as and when
                                    requested
<PAGE>
                         (b)  Staff Season Ticket Loans and Personal Loans

                              (i)   Provide details of new employee season
                                    ticket loans and personal loans

                              (ii)  Update the loan balances

                              (iii) Reconcile the normal ledger to the balance
                                    advised by ADP posting adjustments as
                                    required

                              (iv)  Query employee loans appearing as
                                    reconciling items for more than one month
                                    with ADP and make adjustments

                         (c)  Inter-company Balances Reconciled

                              (i)   Reconcile monthly all inter-company balances
                                    between all group companies and FT
                                    Interactive (Europe)

                              (ii)  Notify management accountants of any
                                    unresolved or disputed balances and journal
                                    any necessary adjustments

                              (iii) Complete the inter-company matrix and send
                                    directly to FT Interactive Data Corporation

                     3.  Taxation Support

                         (a)  Advise of relevant VAT developments

                         (b)  Prepare VAT returns and submit to Customs and
                              Excise by reporting date

                         (c)  VAT query helpline for specific tax guidance;
                              available for issues of principle (eg
                              interpretation of changes to tax legislation)
                              rather than routine inquiries (eg VAT charge on an
                              invoice)

                         (d)  Prepare annual PSA return and submit it to Inland
                              Revenue

                     4.  Cash Allocation

                         (a)  Process on the sales ledger all cash receipts

                              (i)   Process and allocate to the appropriate
                                    sales debtor all payment receipts as
                                    supplied by the cashier's office within 48
                                    hours (but always 100% by month-end close),
                                    to include accounting entries for bank
                                    charges and any exchange differences

                         (b)  Control and reconcile unallocated cash account

                              (i)   Reconcile debtor suspense and ensure balance
                                    is zero at the end of each month

                              (ii)  Reconcile unallocated cash on a regular
                                    basis and ensure balance remains below
                                    20,000 GBP

                              (iii) Inform FT Interactive (Europe) controllers
                                    when unidentified cash is received

                     5.  Reports

                         (a)  Cash Spreadsheet
<PAGE>
                              (i)   Update cash spreadsheet daily for all cash
                                    receipts posted to the sales ledger

                              (ii)  Ensure that cash spreadsheet is distributed
                                    to credit controllers on a daily basis and
                                    to FT Interactive (Europe) management on a
                                    weekly basis

                     6.  Annual Reporting

                         (a)  Preparation of year-end file and annual statutory
                              accounts for review and sign off by auditors

Primary Contacts:    FT Publishing Group Controller, Financial Times Limited,
                     Number One Southwark Bridge, London, SE1 9DL, England

                     European Finance Director, FT Interactive Data (Europe)
                     Limited, Fitzroy House, 13-17 Epworth Street, London, EC2A
                     4DL, England

Fees:                139,552 GBP

Service Period:      Commencing February 29, 2004, as revised August 2004 and
                     continuing thereafter until such time as the service is
                     terminated in accordance with the terms of the Agreement

Notice Period for       1 year.
Termination:
<PAGE>
                                   SCHEDULE 34
                           FINANCIAL TIMES - FTS VIEW
                            (MODIFIED SEPTEMBER 2004)

Service Provider:    FT Interactive Data (Europe) Limited ("FTID")

Service Recipient:   The Financial Times Limited ("Financial Times")

Service Description: Facilitate matching of news stories with home ticker codes
                     using FTS (view only) and Securities Alert services

Primary Contacts:    Lisa Moore, Customer Services Manager, FT Interactive Data
                     (Europe) Limited, Fitzroy House, 13-17 Epworth Street,
                     London, EC2A 4DL, England

                     Kathryn Roberts, Financial Times, Number One
                     Southwark Bridge, London, SE1 9HL

Fees:                5 view licences         GBP 6,500 p.a. (in aggregate) plus

                     Securities Alert File(s):

<TABLE>
<S>                  <C>                                       <C>
                     Up to 10,000 securities                   GBP 0.80 per security p.a.
                     Between 10,001 to 20,000 securities       GBP 0.50 per security p.a.
                     Greater than 20,000 securities            GBP 0.25 per security p.a.
                     Subject to a minimum of 5,000 securities
</TABLE>

                     For example, for 18,000 securities it is .80 x 10,000 plus
                     .50 x 8000. Total amount due would be 18,500 GBP

                     Thereafter, Charges are subject to variation by FTID giving
                     Financial Times at least 3 months notice in writing. All
                     costs quoted are exclusive of VAT and will be paid
                     quarterly in advance.

Service Period:      Commencing in May, 2001 and continuing thereafter until
                     such time as the service is terminated in accordance with
                     the terms of the Agreement.

Notice Period for
Termination:         3 months
<PAGE>
                                   SCHEDULE 42
                               FT.COM - REMOTEPLUS

Service Provider:    FT Interactive Data (Europe) Limited ("FTID")

Service Recipient:   The Financial Times Limited ("Financial Times") trading as
                     FT Research Centre

Service Description: FTID will provide access to Remoteplus via user id D4HFINN.
                     This is to be used to facilitate the FT Research Centre in
                     research for their clients both for current data and for
                     time series (historical) data. In the majority of cases the
                     data will be use to calculate or crunch numbers, therefore
                     adding value to the information. However, from time to time
                     the FT Research Centre will be required to provide data in
                     its raw format.

                     This is based on the understanding that the clients agree
                     in turn not to use this data for onward publication to any
                     degree, and that accreditation is given where Remoteplus is
                     used.

Primary Contacts:    Lisa Moore. Customer Services Manager, FT Interactive Data
                     (Europe) Limited, Fitzroy House, 13-17 Epworth Street,
                     London, EC2A 4DL, England

                     Robert Santiago, Head FT Research Centre, The Financial
                     Times Limited, Number One Southwark Bridge, London, SE1 9HL

Fees:                A 30 % royalty will be charged based on revenues gained by
                     the FT Research Centre resulting from Remoteplus. A minimum
                     return will be applied of 2500 GBP pa, which will be billed
                     quarterly in advance. Any additional revenues generated
                     from the royalty return will be billed in arrears. Royalty
                     details will be provided by FT Research Centre, no later
                     that 14 days after each quarter end.

                     Fees quoted are exclusive of VAT and all fixed/ minimum
                     charges will be subject to annual increases as notified in
                     advance

Service Period:      Commencing 01/01/2004, and continuing thereafter until such
                     time as the service is terminated in accordance with the
                     agreement.

Notice Period for    3 months
Termination:
<PAGE>
                                   SCHEDULE 43
                        HONG KONG OFFICE SPACE & SERVICES

Service Provider:    The Financial Times (Hong Kong) Limited (`FTHK')

Service Recipient:   FT Interactive Data (Hong Kong) Limited & GTIS Hong Kong

Service Description: Provision of Office Space at Suite 2903-2909, Level 29, Two
                     International Finance Centre, No. 8 Finance Street,
                     Central, Hong Kong and related services (as listed on
                     attached Schedule) for use by Interactive Data
                     Corporation's FTID and GTIS subsidiary. operations in Hong
                     Kong, including recharges for actual charges levied by
                     third parties and paid locally by FTHK for related
                     services.

Primary Contacts     For FTHK: Financial Controller,
(Relationship        The Financial Times (Hong Kong) Limited, 6/F, Suite
Managers):           609-612, One International Finance Centre, No. 1 Harbour
                     View Street Central, Hong Kong

                     For FTID-HK: Financial Controller, FT Interactive Data,
                     1155 Malvern Road, Victoria 3144 Melbourne, Australia

                     For GTIS : Executive Vice President (currently Adam
                     Kanciper), GTIS, 100 William Street, 17th Floor, New York,
                     NY 10038

Fees:                As per attached Exhibit A.

                     Office rent may be proportionately increased by FTHK if the
                     rent charged to FTHK by the Hong Kong landlord is
                     increased.

                     Any increase to be proportionate to overall lease increase.
                     Any other charges other than those set forth on the
                     Schedule only by written agreement between FTHK, Financial
                     Controller, and Interactive on behalf of FT Interactive
                     Data, Australia and GTIS as appropriate.

Service Period:      Commencing July 1, 2003, and continuing thereafter until
                     such time as the service is terminated in accordance with
                     the Agreement.

Notice Period for    By either party, upon 90 days advance written notice
Termination:
<PAGE>
Exhibit A to Schedule 43 to MSA

THE FINANCIAL TIMES (HK) LTD RECHARGES TO FT INTERACTIVE DATA (HONG KONG)
LIMITED & GTIS HONG KONG

<TABLE>
<CAPTION>
                                                                                FTID HK 2004  GTIS HK 2004    TOTAL      TOTAL
                                                                                  ESTIMATED    ESTIMATED    ESTIMATED  ESTIMATED
                                                                                   ANNUAL        ANNUAL       ANNUAL     ANNUAL
                                                                                   AMOUNT        AMOUNT       AMOUNT     AMOUNT
EXPENSE DESCRIPTION                              SHARE BASIS                        HK $          HK $         HK $       US $
----------------------------------  ------------------------------------------  ------------  ------------  ---------  ---------
<S>                                 <C>                                         <C>           <C>           <C>        <C>
Office Rent/ Management fee         Floorspace (based on number of Staff plus
                                    appropriate share of common area)             360,000       240,000      600,000     76,923
Cleaning (office, phones, windows,  Floorspace (based on number of Staff plus
carpets)                            appropriate share of common area)               1,200           360        1,560        200
Electricity    .                    Floorspace (based on number of Staff plus
                                    appropriate share of common area)               9,600         2,400       12,000      1,538
Shared Receptionist MPF (pension)   Floorspace (based on number of Staff plus
                                    appropriate share of common area)                 720           240          960        123
Office expenses                     Floorspace (based on number of Staff plus
                                    appropriate share of common area)               3,600           960        4,560 .      585
Pantry                              Floorspace (based on number of Staff plus
                                    appropriate share of common area)               1,200           360        1,560        200
Property Taxes                      Floorspace (based on number of Staff plus
                                    appropriate share of common area)              12,000         3,600       15,600      2,000
Shared Receptionist Salary          Floorspace (based on number of Staff plus
                                    appropriate share of common area)              14,400         3,600       18,000      2,308
Stationery                          Floorspace (based on number of Staff plus
                                    appropriate share of common area)               1,200           360        1,560        200
Hexagon fee (on line bank           Equally shared by 3 companies using the
account lookup facility)            service (FT HK, FTEP & FTID)                    2,720                      2,720        349
Mobile phone charges                Actual usage                                   48,000                     48,000      6,154
Telephone Cost                      Actual usage                                    7,200         2,400        9,600      1,231
Postage                             Actual usage                                      600           360          960        123
Payroll administration fee          Based on Number of staff - 3 (HK$500 each)     18,000                     18,000      2,308
MPF (pension) recharge              5% of monthly salary with maximum of
                                    HK$2,000 per head                              48,000                     48,000      6,154

TOTAL                                                                             528,440       254,640      783,080    100,395
</TABLE>

NOTE 1: COST IS AN ESTIMATE IF IT IS VARIABLE EXPENSES.
NOTE 2: FX RATE USED IS US$1 = HK$ 7.80<PAGE>

                              MKS INSTRUMENTS, INC.

                           SECOND AMENDED AND RESTATED

                   1997 DIRECTOR STOCK OPTION PLAN, AS AMENDED

                            (as of December 16, 2004)

1.    Purpose.

      The purpose of this Second Amended and Restated 1997 Director Stock Option
Plan (the "Plan") of MKS Instruments, Inc., a Massachusetts corporation (the
"Company"), is to encourage ownership in the Company by non-employee directors
of the Company whose continued services are considered essential to the
Company's future progress and to provide them with a further incentive to remain
as directors of the Company.

2.    Administration.

      The Board of Directors shall supervise and administer the Plan. Grants of
stock options under the Plan and the amount and nature of the awards to be
granted shall be automatic in accordance with Section 5. However, all questions
of interpretation of the Plan or of any options issued under it shall be
determined by the Board of Directors and such determination shall be final and
binding upon all persons having an interest in the Plan.

3.    Participation in the Plan.

      Directors of the Company who are not employees of the Company or any
subsidiary of the Company shall be eligible to participate in the Plan.

4.    Stock subject to the Plan.

      (a) Definition of Common Stock. "Common Stock" means (i) prior to the
closing of the Company's initial public offering of common stock pursuant to an
effective registration statement under the Securities Act of 1933 ("IPO"), the
Class B Common Stock, no par value per share, of the Company, and (ii) from and
after the closing of the IPO, the Common Stock, no par value per share, of the
Company.

      (b) The maximum number of shares of the Company's Common Stock which may
be issued under the Plan shall be 750,000 shares, subject to adjustment as
provided in Section 7. All share amounts set forth in this Plan reflect all
stock splits effected prior to April 16, 2003 (the "Restatement Date").

      (c) If any outstanding option under the Plan for any reason expires or is
terminated without having been exercised in full, the shares allocable to the
unexercised portion of such option shall again become available for grant
pursuant to the Plan.

      (d) All options granted under the Plan shall be nonstatutory options not
entitled to special tax treatment under Section 422 of the Internal Revenue Code
of 1986, as amended to date and as it may be amended from time to time (the
"Code").

5.    Terms, Conditions and Form of Options.

<PAGE>

            Each option granted under the Plan shall be evidenced by a written
agreement in such form as the Board of Directors shall from time to time
approve, which agreements shall comply with and be subject to the following
terms and conditions:

      (a) Option Grant Dates. Options shall automatically be granted to all
eligible outside directors as follows:

            (i) each person who first becomes an eligible outside director after
the Restatement Date shall be granted an option to purchase 20,000 shares of
Common Stock on the date of his or her initial election to the Board of
Directors; and

            (ii) each eligible outside director then in office on the date of
each annual meeting of stockholders of the Company shall be granted an
additional option to purchase 12,000 shares of Common Stock on the date of each
such annual meeting of stockholders, provided that he or she was elected to
serve as a director of the Company at least six months prior to the date of such
meeting.

      (b) Option Exercise Price. The option exercise price per share for each
option granted under the Plan shall equal (i) the last reported sales price per
share of the Company's Common Stock on the Nasdaq National Market (or, if the
Common Stock is traded on a national securities exchange on the date of grant,
the reported closing sales price per share of the Common Stock on such exchange)
on the date of grant (or if no such price is reported on such date such price as
reported on the nearest preceding day), (ii) if the Common Stock is not traded
on the Nasdaq National Market or a national securities exchange, the fair market
value per share on the date of grant as determined by the Board of Directors or
(iii) the average of the closing bid and asked prices in the over-the-counter
market.

      (c) Transferability of Options. Except as the Board of Directors of the
Company may otherwise determine or provide in a written agreement entered into
in connection with the grant of an option under the Plan, options shall not be
sold, assigned, transferred, pledged or otherwise encumbered by the Optionee,
either voluntarily or by operation of law except by will or the laws of descent
and distribution, and during the life of the optionee and shall be exercisable
only by him. Reference to an optionee, to the extent relevant in the context,
shall include references to authorized transferees.

      (d) Vesting Period. Except as the Board may otherwise determine or provide
in a written agreement entered into in connection with the grant of an option
under the Plan, each option granted pursuant to paragraph (a)(i) of this Section
5 shall become exercisable in twelve (12) equal quarterly installments following
the date of grant. Each option granted pursuant to paragraph (a)(ii) of this
Section 5 shall become fully exercisable on the day prior to the first annual
meeting of stockholders of the Company following the date of grant (or if no
such meeting is held within thirteen (13) months after the date of grant, on the
thirteen-month anniversary of the date of grant).

      (e) Termination(1). Upon termination of an optionee's service as a
director of the Company, each option granted to him and held by him may be
exercised during the one-year period following such termination of service, as
to the exercisable portion of such option as of the date of termination,
provided that (i) no option may be exercised more than ten (10) years after the
date of grant and (ii) in the event an optionee ceases to serve as a director
due to his

----------
(1) See amendment to this Section 5(e)

<PAGE>

death or disability (within the meaning of Section 22(e)(3) of the Code or any
successor provision), each option may be exercised, within the one-year period
following the date the optionee ceases to serve as a director, by the optionee
or by the person to whom the option is transferred by will, by the laws of
descent and distribution, or by written notice, as to the portion of the option
that is exercisable on the date of death or disability and as to the additional
portion that would have become exercisable on the next anniversary date of the
date of grant of such option.

      (f) Exercise Procedure. Options may be exercised only by written notice to
the Company at its principal office accompanied by (i) payment in cash of the
full consideration for the shares as to which they are exercised or (ii) an
irrevocable undertaking, in form and substance satisfactory to the Company, by a
broker to deliver promptly to the Company sufficient funds to pay the exercise
price or delivery of irrevocable instructions, in form and substance
satisfactory to the Company, to a broker to deliver promptly to the Company cash
or a check sufficient to pay the exercise price.

      (g) Exercise by Representative Following Death of Director. An optionee,
by written notice to the Company, may designate one or more persons (and from
time to time change such designation), including his or her legal
representative, who, by reason of the director's death, shall acquire the right
to exercise all or a portion of the option. If the person or persons so
designated wish to exercise any portion of the option, they must do so within
the term of the option as provided herein. Any exercise by a representative
shall be subject to the provisions of the Plan.

6.    Limitation of Rights.

      (a) No Right to Continue as a Director. Neither the Plan, nor the granting
of an option nor any other action taken pursuant to the Plan, shall constitute
or be evidence of any agreement or understanding, express or implied, that the
Company will retain the optionee as a director for any period of time.

      (b) No Stockholders' Rights for Options. An optionee shall have no rights
as a stockholder with respect to the shares covered by his options until the
date of the issuance to him of a stock certificate therefor, and no adjustment
will be made for dividends or other rights (except as provided in Section 7) for
which the record date is prior to the date such certificate is issued.

7.    Changes in Common Stock.

      (a) If, at any time after the Restatement Date, the outstanding shares of
Common Stock are increased, decreased or exchanged for a different number or
kind of shares or other securities, or if additional shares or new or different
shares or other securities are distributed with respect to such shares of Common
Stock or other securities, through merger, consolidation, sale of all or
substantially all of the assets of the Company, reorganization,
recapitalization, reclassification, stock dividend, stock split, reverse stock
split or other distribution with respect to such shares of Common Stock, or
other securities, an appropriate and proportionate adjustment will be made in
(i) the maximum number and kind of shares reserved for issuance under the Plan,
(ii) the number and kind of shares or other securities issuable pursuant to
Sections 5(a)(i) and 5(a)(ii) above, (iii) the number and kind of shares or
other securities subject to then outstanding options under the Plan and (iv) the
price for each share subject to any then outstanding options under the Plan,
without changing the aggregate purchase price as to which

<PAGE>

such options remain exercisable. No fractional shares will be issued under the
Plan on account of any such adjustments.

      (b) In the event of (i) a consolidation, merger or other reorganization in
which all of the outstanding shares of Common Stock are exchanged for
securities, cash or other property of any other corporation or business entity
or (ii) any sale of all or substantially all of the Company's assets (in either
event, an "Acquisition"), all options outstanding under the Plan immediately
prior to the effective date of such Acquisition shall become automatically
exercisable in full upon the effective date of such Acquisition.

8.    Amendment of the Plan.

            The Board of Directors may suspend or discontinue the Plan or revise
or amend it in any respect whatsoever; provided, however, that without approval
of the stockholders of the Company no revision or amendment shall change the
number of shares subject to the Plan (except as provided in Section 7).

9.    Notice.

            Any written notice to the Company required by any of the provisions
of the Plan shall be addressed to the Chief Financial Officer of the Company and
shall become effective when it is received.

10. Governing Law.

            The Plan and all determinations made and actions taken pursuant
hereto shall be governed by the laws of The Commonwealth of Massachusetts.

                                              Adopted by the Board of Directors
                                              on December 31, 1997 and approved
                                              by the stockholders on January 9,
                                              1998;

                                              Amendments and restatement
                                              approved by the Board of Directors
                                              on April 16, 2003;

                                              Amendment approved by the Board of
                                              Directors on March 4, 2004 and by
                                              the stockholders on May 13, 2004.

                                              Amendment (attached) approved by
                                              Board of Directors on December 16,
                                              2004

<PAGE>

       AMENDMENT APPROVED BY THE BOARD OF DIRECTORS ON DECEMBER 16, 2004

Section 5(e) shall read in its entirety as follows:

      (e) Termination. Upon termination of an optionee's service as a director
      of the Company, each option granted to him on or after May 17, 2000 and
      held by him may be exercised during the three-year period following such
      termination of service, as to the exercisable portion of such option as of
      the date of termination, provided that (i) no option may be exercised more
      than ten (10) years after the date of grant and (ii) in the event an
      optionee ceases to serve as a director due to his death or disability
      (within the meaning of Section 22(e)(3) of the Code or any successor
      provision), each option may be exercised, within the three-year period
      following the date the optionee ceases to serve as a director, by the
      optionee or by the person to whom the option is transferred by will, by
      the laws of descent and distribution, or by written notice, as to the
      portion of the option that is exercisable on the date of death or
      disability and as to the additional portion that would have become
      exercisable on the next anniversary date of the date of grant of such
      option.
<PAGE>

                              MKS INSTRUMENTS, INC.

          Nonstatutory Option Agreement for an Initial Election Option
     Granted under the Amended and Restated 1997 Director Stock Option Plan

1.    Grant of Option.

      This agreement evidences the grant by MKS Instruments, Inc., a
Massachusetts corporation (the "Company"), on <<Stock_Date>> (the "Grant Date")
to <<First>> <<Last>> a director of the Company (the "Participant"), of an
option to purchase, in whole or in part, on the terms provided herein and in the
Company's Amended and Restated1997 Director Stock Option Plan (the "Plan"), a
total of 20,000 shares (the "Shares") of common stock, no par value per share,
of the Company ("Common Stock") at $<<Price>> per Share. Unless earlier
terminated, this option shall expire on <<Expire>> the ("Final Exercise Date").

      It is intended that the option evidenced by this agreement shall not be an
incentive stock option as defined in Section 422 of the Internal Revenue Code of
1986, as amended and any regulations promulgated thereunder (the "Code"). Except
as otherwise indicated by the context, the term "Participant", as used in this
option, shall be deemed to include any person who acquires the right to exercise
this option validly under its terms.

2.    Vesting Schedule.

      This option shall become exercisable in twelve (12) equal quarterly
installments following the date of grant. This option shall expire upon, and
will not be exercisable after, the Final Exercise Date.

3.    Exercise of Option.

      (a) Form of Exercise. Each election to exercise this option shall be in
writing, signed by the Participant, and received by the Company at its principal
office, accompanied by this agreement, and payment in full in the manner
provided in the Plan. The Participant may purchase less than the number of
shares covered hereby, provided that no partial exercise of this option may be
for any fractional share.

      (b) Continuous Relationship with the Company Required. Except as otherwise
provided in this Section 3, this option may not be exercised unless the
Participant, at the time he or she exercises this option, is, and has been at
all times since the Grant Date, an employee, officer or a director of, or
consultant or advisor to, the Company or any parent or subsidiary of the Company
as defined in Section 424(e) or (f) of the Code (an "Eligible Participant").

      (c) Termination of Relationship with the Company. If the Participant
ceased to be an Eligible Participant for any reason, then, except as provided in
paragraph (d)

                                                                          Page 1

<PAGE>

below, the right to exercise this option shall terminate three years after such
cessation (but in no event after the Final Exercise Date), provided that this
option shall be exercisable only to the extent that the Participant was entitled
to exercise this option on the date of such cessation. Notwithstanding any other
provision of this Agreement, if the Participant, prior to the Final Exercise
Date, violates the non-competition or confidentiality provisions of any
agreement between the Participant and the Company, the right to exercise this
option shall terminate immediately upon written notice to the Participant from
the Company describing such violation.

      (d) Exercise Period Upon Death or Disability. If the Participant dies or
becomes disabled (within the meaning of Section 22(e) (3) of the Code) prior to
the Final Exercise Date while he or she is an Eligible Participant this option
shall be exercisable, within the period of three years following the date of
death or disability of the Participant, by the Participant, provided that this
option shall be exercisable only to the extent that this option was exercisable
by the Participant on the date of his or her death or disability, and further
provided that this option shall not be exercisable after the Final Exercise
Date.

4.    Withholding.

      No shares will be issued pursuant to the exercise of this option unless
and until the Participant pays to the Company, or makes provision satisfactory
to the Company for payment of, any federal, state or local withholding taxes
required by law to be withheld in respect of this option.

5.    Nontransferability of Option.

      This option may not be sold, assigned, transferred, pledged or otherwise
encumbered by the Participant, either voluntarily or by operation of law, except
by will or the laws of descent and distribution, and, during the lifetime of the
Participant, this option shall be exercisable only by the Participant.

6.    Provisions of the Plan.

      This option is subject to the provisions of the Plan, a copy of which is
furnished to the Participant with this option.

      IN WITNESS WHEREOF, the Company has caused this option to be executed
under its corporate seal by its duly authorized officer. This option shall take
effect as a sealed instrument.

                                  MKS Instruments, Inc.

Dated: <<Stock_Date>>             By: __________________________________________

                                  Name: John R. Bertucci
                                  Title: Chairman, Chief Executive Officer, and
                                        President

                                                                          Page 2

<PAGE>

                              OPTIONEE'S ACCEPTANCE

      The undersigned hereby accepts the foregoing option and agrees to the
terms and conditions thereof. The undersigned hereby acknowledges receipt of a
copy of the Company's Amended and Restated 1997 Director Stock Option Plan.

                                          <<First>> <<Last>>

                                          ______________________________________
                                          (Director's Signature)

                                          Address: <<Street>>

                                                   <<City>>, <<State>>  <<Zip_>>

                                                                          Page 3
<PAGE>

                              MKS INSTRUMENTS, INC.

                       Nonstatutory Stock Option Agreement
       Granted Under Amended and Restated 1997 Director Stock Option Plan

1.    Grant of Option.

      This agreement evidences the grant by MKS Instruments, Inc., a
Massachusetts corporation (the "Company"), on <<Stock_Date>> (the "Grant Date")
to <<First>> <<Last>> a director of the Company (the "Participant"), of an
option to purchase, in whole or in part, on the terms provided herein and in the
Company's Amended and Restated1997 Director Stock Option Plan (the "Plan"), a
total of 12,000 shares (the "Shares") of common stock, no par value per share,
of the Company ("Common Stock") at $<<Price>> per Share. Unless earlier
terminated, this option shall expire on <<Expire>> the ("Final Exercise Date").

      It is intended that the option evidenced by this agreement shall not be an
incentive stock option as defined in Section 422 of the Internal Revenue Code of
1986, as amended and any regulations promulgated thereunder (the "Code"). Except
as otherwise indicated by the context, the term "Participant", as used in this
option, shall be deemed to include any person who acquires the right to exercise
this option validly under its terms.

2.    Vesting Schedule.

      This option shall not be exercisable until the earlier of (a) the day
prior to the first Annual Meeting of the Company's stockholders which occurs
after the date hereof or (b) thirteen months after the Grant Date, at which time
it shall become exercisable in full. This option shall expire upon, and will not
be exercisable after, the Final Exercise Date.

3.    Exercise of Option.

      (a) Form of Exercise. Each election to exercise this option shall be in
writing, signed by the Participant, and received by the Company at its principal
office, accompanied by this agreement, and payment in full in the manner
provided in the Plan. The Participant may purchase less than the number of
shares covered hereby, provided that no partial exercise of this option may be
for any fractional share.

      (b) Continuous Relationship with the Company Required. Except as otherwise
provided in this Section 3, this option may not be exercised unless the
Participant, at the time he or she exercises this option, is, and has been at
all times since the Grant Date, an employee, officer or a director of, or
consultant or advisor to, the Company or any parent or subsidiary of the Company
as defined in Section 424(e) or (f) of the Code (an "Eligible Participant").

      (c) Termination of Relationship with the Company. If the Participant
ceased to

                                                                          Page 1

<PAGE>

be an Eligible Participant for any reason, then, except as provided in paragraph
(d) below, the right to exercise this option shall terminate three years after
such cessation (but in no event after the Final Exercise Date), provided that
this option shall be exercisable only to the extent that the Participant was
entitled to exercise this option on the date of such cessation. Notwithstanding
any other provision of this Agreement, if the Participant, prior to the Final
Exercise Date, violates the non-competition or confidentiality provisions of any
agreement between the Participant and the Company, the right to exercise this
option shall terminate immediately upon written notice to the Participant from
the Company describing such violation.

      (d) Exercise Period Upon Death or Disability. If the Participant dies or
becomes disabled (within the meaning of Section 22(e) (3) of the Code) prior to
the Final Exercise Date while he or she is an Eligible Participant this option
shall be exercisable, within the period of three years following the date of
death or disability of the Participant, by the Participant, provided that this
option shall be exercisable only to the extent that this option was exercisable
by the Participant on the date of his or her death or disability, and further
provided that this option shall not be exercisable after the Final Exercise
Date.

4.    Withholding.

      No shares will be issued pursuant to the exercise of this option unless
and until the Participant pays to the Company, or makes provision satisfactory
to the Company for payment of, any federal, state or local withholding taxes
required by law to be withheld in respect of this option.

5.    Nontransferability of Option.

      This option may not be sold, assigned, transferred, pledged or otherwise
encumbered by the Participant, either voluntarily or by operation of law, except
by will or the laws of descent and distribution, and, during the lifetime of the
Participant, this option shall be exercisable only by the Participant.

6.       Provisions of the Plan.

         This option is subject to the provisions of the Plan, a copy of which
is furnished to the Participant with this option.

         IN WITNESS WHEREOF, the Company has caused this option to be executed
under its corporate seal by its duly authorized officer. This option shall take
effect as a sealed instrument.

                                   MKS Instruments, Inc.

Dated: <<Stock_Date>>              By: _________________________________________

                                   Name:  John R. Bertucci
                                   Title: Chairman, Chief Executive Officer, and
                                          President

                                                                          Page 2

<PAGE>

                              OPTIONEE'S ACCEPTANCE

      The undersigned hereby accepts the foregoing option and agrees to the
terms and conditions thereof. The undersigned hereby acknowledges receipt of a
copy of the Company's Amended and Restated 1997 Director Stock Option Plan.

                                          <<First>><<Last>>

                                          ______________________________________
                                          (Director's Signature)

                                          Address: <<Street>>

                                                   <<City>>, <<State>>  <<Zip_>>

                                                                          Page 3

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