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Exhibit 4.2

DESCRIPTION OF THE REGISTRANT’S SECURITIES
REGISTERED PURSUANT TO SECTION 12 OF THE
SECURITIES EXCHANGE ACT OF 1934
The following summary of the capital stock of CMC Materials, Inc. does not purport to be complete and is qualified in its entirety by reference to our (second) amended and restated certificate of incorporation (as amended, our “charter”), our (fourth) amended and restated by-laws (our “by-laws”, and together with our charter, as amended and restated, our “organizational documents”), each of which are incorporated by reference as an exhibit to the Annual Report on Form 10-K of which this Exhibit is a part, and certain provisions of Delaware law. Unless the context requires otherwise, all references to “we”, “us,” “our” and “CMC Materials” in this section refer solely to CMC Materials, Inc. and not to our subsidiaries.
General
Under our charter, CMC Materials, Inc.’s authorized capital stock consists of 20,000,000 shares of common stock, $0.001 par value per share, and 200,000,000 shares of preferred stock, $0.001 par value per share. As of October 31, 2020, there were 29,081,617 shares of CMC Materials common stock outstanding and no shares of CMC Materials preferred stock outstanding. All outstanding shares of CMC Materials common stock are duly authorized, validly issued, fully paid and non-assessable.
Common Stock
Voting
Holders of CMC Materials common stock are entitled to one vote per share on all matters to be voted on by CMC Materials stockholders. Holders of CMC Materials common stock do not have cumulative rights, so that holders of a majority of the shares of CMC Materials common stock present at a meeting at which a quorum is present are able to elect all of CMC Materials directors eligible for election in a given year. The holders of a majority of the voting power of the issued and outstanding CMC Materials common stock constitute a quorum.
Dividends
Holders of CMC Materials common stock are entitled to receive ratably the dividends, if any, that are declared by the CMC Materials board of directors. The CMC Materials board of directors may declare dividends out of funds legally available for the declaration of dividends, subject to the preferential rights of any holder of preferred stock that may from time to time be outstanding.
Liquidation Rights
Upon the liquidation, dissolution or winding up of CMC Materials, the holders of CMC Materials common stock are entitled to share pro rata in the distribution of all of the assets available for distribution after satisfaction of all liabilities and the payment of the liquidation preference of any preferred stock that may be outstanding. 
Other Matters
The holders of CMC Materials common stock will have no preemptive or other subscription rights to purchase common stock, and there are no redemptive rights or sinking fund provisions.
The rights, preferences and privileges of holders of CMC Materials common stock are subject to and may be adversely affected by the rights of the holders of shares of any series of preferred stock that CMC Materials Microelectronics may designate and issue in the future.
CMC Materials common stock is listed on The Nasdaq Global Select Market under the symbol “CCMP.”
The transfer agent and registrar for CMC Materials common stock is Computershare Trust Company, N.A.

Preferred Stock 
The CMC Materials board of directors is authorized to cause shares of preferred stock to be issued in one or more series, to:
•determine the number of shares of each series;
•fix the rights, powers, preferences and privileges of each series;
•fix any qualifications, limitations or restrictions thereon; and
•increase or decrease the number of shares of each such series.
Among the specific matters that may be determined by the board of directors are:
•the annual rate of dividends;
•the redemption price, if any;
•the terms of a sinking or purchase fund, if any;
•the amount payable in the event of any voluntary liquidation, dissolution or winding up of the affairs of CMC Materials;
•conversion rights, if any; and
•voting powers, if any.
Depending upon the terms of the preferred stock established by the CMC Materials board of directors, any or all series of preferred stock could have preferences over the common stock with respect to dividends and other distributions and upon liquidation or could have voting or conversion rights that could adversely affect the holders of the outstanding common stock.
Certain Effects of Authorized but Unissued Stock
CMC Materials has shares of common stock and preferred stock available for future issuance without stockholder approval. CMC Materials may utilize these additional shares for a variety of corporate purposes, including future public offerings to raise additional capital or facilitate corporate acquisitions or for payment as a dividend on the capital stock. The existence of unissued and unreserved common stock and preferred stock may enable the CMC Materials board of directors to issue shares to persons friendly to current management or to issue preferred stock with terms that could render more difficult or discourage a third-party attempt to obtain control of CMC Materials by means of a merger, tender offer, proxy contest or otherwise, thereby protecting the continuity of CMC Materials' management.
Provisions of CMC Materials Charter, CMC Materials Bylaws and DGCL That May Have Anti-Takeover Effects
The CMC Materials charter, the CMC Materials bylaws and Section 203 of the Delaware General Corporation Law (“DGCL”) contain provisions summarized below that may delay, discourage or prevent the acquisition or control of CMC Materials by means of a tender offer, open market purchase, proxy fight or otherwise, including acquisitions that might result in a premium being paid over the market price of the common stock.
Stockholder Action by Written Consent; Special Meetings
Any action required or permitted to be taken by CMC Materials stockholders may be effected only at a duly called annual or special meeting of stockholders and may not be effected by a written consent in lieu of a meeting of stockholders. Except as otherwise required by law and subject to the rights of the holders of any preferred stock, special meetings of stockholders for any purpose may be called only by the CMC Materials board of directors, its chairman or, at the written request of a majority of the CMC Materials board of directors, the president.

Advance Notice Procedures
The CMC Materials bylaws require advance notice of the nomination, other than by or at the direction of the CMC Materials board of directors, of candidates for election as directors, as well as for other stockholder proposals, to be considered at special meetings of stockholders. Subject to certain exceptions, notice of intent to nominate a director or raise matters at these meetings will have to be received in writing not less than 90 nor more than 120 days prior to the anniversary of the previous year's annual meeting of stockholders, and must contain specific information concerning the person to be nominated or the matters to be brought before the meeting and concerning the stockholder submitting the proposal. If the chairman of a meeting determines that an individual was not nominated, or other business was not brought before the meeting, in accordance with the advance notice procedures, that individual will not be eligible for election as a director, or that business will not be conducted at such meeting, as the case may be.
Board of Directors
The CMC Materials charter and bylaws provide that the number of directors shall be determined from time to time by a resolution adopted by the majority of the CMC Materials directors. The CMC Materials charter and bylaws also provide that the board of directors be divided into three classes, as nearly equal in number as possible. Each director holds office until that person's successor is duly elected and qualified. Vacancies on the board of directors are filled by a majority of the remaining directors, or by a sole remaining director, or by CMC Materials stockholders if the vacancy was caused by the action of CMC Materials stockholders.
Any director may be removed from office with or without cause upon the affirmative vote of holders of at least 80% of the CMC Materials outstanding common stock, voting as a single class. A director may not be removed by the stockholders at a meeting unless the notice of the meeting states that the purpose, or one of the purposes, of the meeting is removal of the director.
Adoption, Amendment or Repeal of Charter or Bylaws
The CMC Materials charter provides that the affirmative vote of holders of at least 80% of CMC Materials outstanding common stock is required to amend, repeal or adopt any provision of the CMC Materials charter inconsistent with the provisions of that certificate regarding amendments to the CMC Materials bylaws, stockholder action by written consent, special meetings of stockholders, the CMC Materials board of directors and the election and removal of directors. The CMC Materials charter further provides that the CMC Materials bylaws may be altered, amended or repealed only by the CMC Materials board of directors or upon the affirmative vote of holders of at least 80% of the CMC Materials outstanding common stock, voting together as a single class.
Takeover Statutes
Section 203 of the DGCL generally prohibits “business combinations,” including mergers, sales and leases of assets, issuances of securities and similar transactions by a corporation or a subsidiary with an interested stockholder who beneficially owns 15% or more of a corporation's voting stock, within three years after the person or entity becomes an interested stockholder, unless: (i) the board of directors of the target corporation has approved, before the acquisition time, either the business combination or the transaction that resulted in the person becoming an interested stockholder, (ii) upon consummation of the transaction that resulted in the person becoming an interested stockholder, the person owns at least 85% of the corporation's voting stock (excluding shares owned by directors who are officers and shares owned by employee stock plans in which participants do not have the right to determine confidentially whether shares will be tendered in a tender or exchange offer) or (iii) after the person or entity becomes an interested stockholder, the business combination is approved by the board of directors and authorized at a meeting of stockholders by the affirmative vote of at least 662/3% of the outstanding voting stock not owned by the interested stockholder. CMC Materials has not opted out of the protections of Section 203 of the DGCL.Document

CMC Materials, Inc.
2007 Employee Stock Purchase Plan
(as Amended and Restated September 23, 2013)
ARTICLE I
INTRODUCTION
1.01Purpose.  The purpose of the CMC Materials, Inc. Employee Stock Purchase Plan (the “Plan”) is to provide employees of CMC Materials, Inc. (the “Company”) and its Designated Subsidiary Corporations with an opportunity to purchase Common Stock of the Company through accumulated payroll deductions.
1.02Rules of Interpretation.  It is the intention of the Company to have the Plan qualify as an “employee stock purchase plan” under Section 423 of the Internal Revenue Code of 1986, as amended (the “Code”), and the provisions of the Plan, accordingly, shall be construed so as to extend and limit participation in a manner consistent with the requirements of that section of the Code; provided, however, that the Committee shall have the discretion to cause the options granted in one or more Offering Periods under the Plan to be options to which Section 423 of the Code does not apply.
ARTICLE II
DEFINITIONS
2.01“Board” shall mean the Board of Directors of the Company.
2.02“Change in Capitalization” shall mean any increase or reduction in the number of shares of Common Stock, or any change (including, but not limited to, in the case of a spin-off, dividend or other distribution in respect of shares of Common Stock, a change in value) in the shares of Common Stock or exchange of shares of Common Stock for a different number or kind of shares, other equity interests or other property of the Company or another entity, by reason of a reclassification, recapitalization, merger, consolidation, reorganization, spin-off, split-up, issuance of warrants or rights or debentures, stock dividend, stock split or reverse stock split, cash dividend, property dividend, combination or exchange of shares, repurchase of shares, change in corporate structure or otherwise.
2.03“Change in Control” shall be as defined in Appendix A.
2.04“Code” shall mean the Internal Revenue Code of 1986, as amended.
2.05“Common Stock” shall mean the Common Stock of the Company.
2.06“Company” shall mean CMC Materials, Inc., a Delaware corporation.
2.07“Compensation” shall mean the gross cash compensation (including base salary, shift premium, overtime earnings and cash bonuses exclusive of relocation and sign-on bonuses) paid by the Company or a Designated Subsidiary Corporation in accordance 

with the terms of employment, but excluding all bonus payments, expense allowances and compensation paid in a form other than cash.
2.08“Committee” shall mean the committee described in Article XI.
2.09“Designated Subsidiary Corporation” shall mean any Subsidiary of the Company which has been designated by the Committee from time to time in its sole discretion as eligible to participate in the Plan.
2.10“Employee” shall mean any individual who is a common law employee of the Company or a Designated Subsidiary Corporation for tax purposes whose customary employment with the Company is at least twenty (20) hours per week and more than five (5) months in any calendar year.
2.11“Enrollment Date” shall mean the first day of each Offering Period.
2.12“Exercise Date” shall mean the last day of each Offering Period.
2.13“Fair Market Value” shall mean, as of any date, the value of a share of Common Stock determined as follows:
2.13.1If the Common Stock is listed on any established stock exchange or a national market system, including without limitation the Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its Fair Market Value shall be the closing sales price for a share of Common Stock (or the closing bid, if no sales were reported) as quoted on such exchange or system on the date of such determination, as reported in  The Wall Street Journal  or such other source as the Committee deems reliable, or
2.13.2If the Common Stock is regularly quoted by a recognized securities dealer but selling prices are not reported, its Fair Market Value shall be the mean of the closing bid and asked prices for a share of the Common Stock on the date of such determination, as reported in  The Wall Street Journal  or such other source as the Committee deems reliable, or
2.13.3In the absence of an established market for the Common Stock, the Fair Market Value of a share thereof shall be determined in good faith by the Committee.
2.14“Offering Period” shall mean a period of approximately six (6) months commencing on the first Trading Day on or after January 1st and terminating on the last Trading Day in the period ending the following June 30th, or commencing on the first Trading Day on or after July 1st  and terminating on the last Trading Day in the period ending the following December 31st, provided, however, that the first Offering Period under the Plan shall commence on the first date on which quotations are available for the Common Stock on 
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any established stock exchange or a national market system and shall end on a Trading Day selected by the Committee consistent with Section 423 of the Code.  The duration of Offering Periods may be changed pursuant to Sections 13.05 and 13.06.
2.15“Plan Representative” shall mean any person designated from time to time by the Committee to receive certain notices and take certain other administrative actions relating to participation in the Plan.
2.16“Plan” shall mean the CMC Materials, Inc. Employee Stock Purchase Plan.
2.17“Prior Plan” shall mean the Cabot Microelectronics Corporation Employee Stock Purchase Plan, effective March 24, 2000.
2.18“Purchase Price” shall mean an amount set by the Committee, but not less than the lesser of 85% of the Fair Market Value of a share of Common Stock on the Enrollment Date or on the Exercise Date, whichever is lower; provided, however, that the Purchase Price may be adjusted by the Board pursuant to Section 13.06.
2.19“Subsidiary” shall mean a corporation, domestic or foreign, of which not less than 50% of the voting shares are held by the Company or a Subsidiary, whether or not such corporation now exists or is hereafter organized or acquired by the Company or a Subsidiary.
2.20“Trading Day” shall mean a day on which national stock exchanges and the Nasdaq System are open for trading.
ARTICLE III
ELIGIBILITY AND PARTICIPATION
3.01Eligibility.  Each Employee on an Enrollment Date of an Offering Period shall be eligible to participate in such Offering Period.  Persons who are not Employees shall not be eligible to participate in such Offering Period.  Employees of Cabot Corporation and its subsidiaries, other than the Company and its Designated Subsidiary Corporations, are not eligible to participate in the Plan.
3.02Restrictions on Participation.  Notwithstanding any provision of the Plan to the contrary, no Employee shall be granted an option to purchase shares of Common Stock under the Plan:
3.02.1If, 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 (for purposes of this paragraph, the rules of Section 424(d) of the Code shall apply in determining stock ownership of any Employee); or
3.02.2If such Employee’s rights to purchase stock under all employee stock purchase plans of the Company accrue at a rate which exceeds $25,000 of 
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Fair Market Value of the stock (determined at the time such option is granted) for each calendar year in which such option is outstanding at any time.
3.03Commencement of Participation.  An Employee may become a participant by completing an authorization for payroll deductions on the form provided by the Company and filing the completed form with the Plan Representative on or before the filing date set therefor by the Committee, which date shall be prior to the next Enrollment Date.  Payroll deductions for a participant shall commence on the next following Enrollment Date after the Employee’s authorization for payroll deductions becomes effective and shall continue until termination of the Plan, the participant’s earlier termination of participation in the Plan, or the participant’s change in payroll deductions pursuant to Section 5.03.  Each participant in the Plan shall be deemed to continue participation until termination of the Plan or such participant’s earlier termination of participation in the Plan pursuant to Article VIII below.
ARTICLE IV
STOCK SUBJECT TO THE PLAN AND OFFERINGS
4.01Stock Subject to the Plan.  Subject to the provisions of Section 13.03 of the Plan1, the Board shall reserve for issuance under the Plan an amount (the “Reserve”) equal to the sum of (i) five hundred thousand (500,000) shares of the Company’s Common Stock, and (ii) the number of shares of the Company’s Common Stock previously reserved for issuance under the Prior Plan but not issued before the adoption of this Plan, which shares shall be authorized but unissued shares of Common Stock, treasury shares, or shares of Common Stock purchased by the Company or the Plan on an established stock exchange or a national market system.
4.02Offerings.  The Plan will be implemented by two annual offerings of the Company’s Common Stock each calendar year.  Each offering will be outstanding during the applicable Offering Period.
ARTICLE V
PAYROLL DEDUCTIONS
5.01Amount of Deduction.  The form described in Section 3.03 will permit a participant to elect payroll deductions of any whole percentage from one percent (1%) through ten percent (10%), or any whole dollar amount that equates to from one percent (1%) through ten percent (10%), of such participant’s Compensation for each pay period during an Offering Period.
5.02Participant’s Account.  All payroll deductions made for a participant shall be credited to an account established for such participant under the Plan.  A participant may not make any separate cash payment into such account.

1 The number of shares available for issuance under the Plan was adjusted in connection with the Company’s leveraged recapitalization completed in March 2012, in accordance with Section 13.03 of the Plan. As of date of this amendment and restatement, there were 730,023 shares remaining available for future issuance under the Plan.
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5.03Changes in Payroll Deductions.  A participant may reduce or increase future payroll deductions (within the limits described in Section 5.01) by filing with the Plan Representative a form provided by the Company for such purpose.  The effective date of any increase or reduction in future payroll deductions will be the next following payroll period succeeding processing of the change form.
ARTICLE VI
GRANTING OF OPTION
6.01Number of Option Shares.  On an Enrollment Date each participant shall be deemed to have been granted an option to purchase a number of shares of Common Stock determined by dividing the participant’s accumulated payroll deductions on the Exercise Date by the lower of (i) 85% of the Fair Market Value of a share of Common Stock on the Enrollment Date or (ii) 85% of the Fair Market Value of a share of Common Stock on the Exercise Date; subject, however, to any applicable limitations contained in this Plan.  In addition, the maximum number of shares a participant may purchase with respect to any Offering Period is that number of shares determined by dividing $12,500 by the Fair Market Value of a share of Common Stock on the Enrollment Date; provided, however, the maximum number of shares a participant may purchase with respect to the first Offering Period is that number of shares determined by dividing $25,000 by the Fair Market Value of a share of Common Stock on the Enrollment Date.
ARTICLE VII
EXERCISE OF OPTION
7.01Automatic Exercise.  Subject to the next following sentence, each Plan participant’s option for the purchase of stock with payroll deductions made during any Offering Period will be exercised automatically on the applicable Exercise Date for the purchase of the number of full and fractional shares of Common Stock that the accumulated payroll deductions in the participant’s account at the time will purchase at the Purchase Price (but not in excess of the maximum number of shares determined pursuant to Section 6.01).  The Committee shall have the discretion to reduce the number of shares of Common Stock to be purchased by participants with respect to an Offering Period and to allocate such reduced number of shares of Common Stock among participants in such Offering Period, so long as such reduction and allocation is done in a manner consistent with Section 423 of the Code.  Any payroll deductions not applied to the purchase of shares of Common Stock by reason of the limitations of or reduction pursuant to this Section 7.01 shall be promptly refunded to participants after the Exercise Date of the Offering Period to which such reduction applies.
7.02Withdrawal of Account.  No participant in the Plan shall be entitled to withdraw any amount from the accumulated payroll deductions in his or her account; provided, however, that a participant’s accumulated payroll deductions shall be refunded to the participant as and to the extent specified in Section 8.01 below upon termination of such participant’s participation in the Plan.
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7.03Fractional Shares.  Fractional shares of Common Stock may be delivered under Section 7.5 of the Plan.  In the event that the Committee prohibits fractional shares under the Plan, any deemed fractional share of Common Stock purchased by a Participant pursuant to Section 7.01 hereof will be combined with any deemed fractional shares purchased by the Participant in subsequent Offering Periods and whole shares of Common Stock then issued therefor.  The Fair Market Value of all deemed fractional shares shall be paid in cash, if applicable.
7.04Exercise of Options.  During a participant’s lifetime, options held by such participant shall be exercisable only by such participant.
7.05Delivery of Stock.  As promptly as practicable after each Exercise Date, the Company will deliver to each participant the shares of Common Stock purchased upon exercise of such participant’s option.  The Company may deliver such shares in certificated or book entry form, at the Company’s sole election.
ARTICLE VIII
WITHDRAWAL
8.01In General.  A participant may stop participating in the Plan at any time by giving written notice to the Plan Representative.  Upon processing of any such written notice, no further payroll deductions will be made from the participant’s Compensation during such Offering Period or thereafter, unless and until such participant elects to resume participation in the Plan by providing written notice to the Plan Representative pursuant to Section 3.03 above.  Such participant’s payroll deductions accumulated prior to processing of such notice shall be applied toward purchasing full and fractional shares of Common Stock in the then-current Offering Period as provided in Section 7.01 above unless the participant requests in writing to have the accumulated payroll deductions and, if applicable, cash in lieu of deemed fractional shares returned to him or her.
8.02Effect on Subsequent Participation.  A participant’s withdrawal from any Offering Period will not have any effect upon such participant’s eligibility to participate in any succeeding Offering Period or in any similar plan which may hereafter be adopted by the Company and for which such participant is otherwise eligible.
8.03Termination of Employment.  Upon termination of a participant’s employment with the Company or any Designated Subsidiary Corporation (as the case may be) for any reason, including retirement but excluding death, the participant’s payroll deductions accumulated prior to such termination, if any, shall be applied toward purchasing full and fractional shares of Common Stock in the then-current Offering Period so long as the Exercise Date with respect to such Offering Period occurs on or within three months following such termination; provided, however, that (1) the participant may request in writing to have the accumulated payroll deductions and, if applicable, cash in lieu of deemed fractional shares returned to him or her, and (2) upon termination of a participant’s employment with the Company or any Designated Subsidiary Corporation (as the case may be) as a result of the participant’s death, the participant’s payroll 
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deductions accumulated prior to such termination and, if applicable, cash in lieu of deemed fractional shares shall be paid to his or her estate.
ARTICLE IX
INTEREST
9.01Payment of Interest.  No interest will be paid or allowed on any money paid into the Plan or credited to the account of or distributed to any participant.
ARTICLE X
STOCK
10.01Participant’s Interest in Option Stock.  No participant will have any interest in shares of Common Stock covered by any option held by such participant until such option has been exercised as provided in Section 7.01 above.
10.02Registration of Stock.  Shares of Common Stock purchased by a participant under the Plan will be recorded in the name of the participant, or, if the participant so directs by written notice to the Plan Representative prior to the applicable Exercise Date, in the names of the participant and the participant’s spouse as joint tenants with rights of survivorship or as tenants by the entireties, to the extent permitted by applicable law.
10.03Restrictions on Exercise.  The Board may, in its discretion, require as conditions to the exercise of any option that the shares of Common Stock reserved for issuance upon the exercise of such option shall have been duly listed, upon official notice of issuance, upon a stock exchange or market, and that either:
10.03.1a registration statement under the Securities Act of 1933, as amended, with respect to said shares shall be effective, or
10.03.2the participant shall have represented at the time of purchase, in form and substance satisfactory to the Company, that it is his or her intention to purchase the shares for investment and not for resale or distribution.
ARTICLE XI
ADMINISTRATION
11.01Appointment of Committee.  The Plan shall be administered by the Board or a Committee of members of the Board appointed by the Board.  The Board or its Committee shall have full and exclusive discretionary authority to construe, interpret and apply the terms of the Plan, to determine eligibility and to adjudicate all disputed claims filed under the Plan.  Every finding, decision and determination made by the Board or its Committee shall, to the full extent permitted by law, be final and binding upon all parties.
11.02Authority of Committee.  Subject to the express provisions of the Plan, the Committee shall have plenary authority in its discretion to interpret and construe any and all provisions of the Plan, to adopt rules and regulations for administering the Plan, and to make all other determinations deemed necessary or advisable for administering the Plan.  
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The Committee’s determination of the foregoing matters shall be conclusive.  Except as otherwise prohibited by applicable law, the Committee may delegate some or all of its authority specified herein to the Plan Representative.
11.03Rules Governing the Administration of the Committee.  The Board may from time to time appoint members of the Committee in substitution for or in addition to members previously appointed and may fill vacancies, however caused, in the Committee.  The Committee may select one of its members as its chairman, shall hold its meetings at such times and places as it shall deem advisable, and may hold telephonic meetings.  All determinations of the Committee shall be made by a majority of its members.  A decision or determination reduced to writing and signed by a majority of the members of the Committee shall be as fully effective as if it had been made by a majority vote at a meeting duly called and held.  The Committee may appoint a secretary and shall make such rules and regulations for the conduct of its business as it shall deem advisable.
11.04Rules and Procedures Applicable to Offering Periods.  The Committee shall have the authority and discretion to adopt rules and procedures applicable to one or more Offering Periods under the Plan.  Any such rules and procedures shall be established by the Committee and communicated to participants in advance of any Offering Period to which they apply.  Such rules and procedures may, in the discretion of the Committee, cause the options granted under any such Offering Period to be options to which Section 423 of the Code does not apply.
ARTICLE XII
FOREIGN JURISDICTIONS
Notwithstanding any other provision in this Plan, the Committee may adopt rules or procedures relating to the operation and administration of the Plan to accommodate the specific requirements of local laws and procedures.  Without limiting the generality of the foregoing sentence, the Committee is specifically authorized to adopt rules and procedures regarding handling of payroll deductions, payment of interest, conversion of local currency, payroll tax, withholding procedures and handling of stock certificates which vary in accordance with the requirements of such local law and procedures.  To the extent that any such rules or procedures are adopted with respect to options granted in an Offering Period to which Section 423 of the Code is intended to apply, the Committee shall cause such rules and procedures to be consistent with Section 423 of the Code.
ARTICLE XIII
MISCELLANEOUS
13.01Transferability.  Neither payroll deductions credited to any participant’s account nor any option or other rights with regard to the exercise of an option 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, in its discretion, treat such act as an election to withdraw from participation in the Plan in accordance with Section 8.01.
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13.02Use of Funds.  All payroll deductions received or held by the Company under the Plan may be used by the Company for any corporate purpose.  The Company shall not segregate such payroll deductions.
13.03Adjustment Upon Changes in Capitalization; Change in Control.
13.03.1Changes in Capitalization.  Subject to any required action by the stockholders of the Company, the remaining Reserve, the maximum number of shares each participant may purchase per Offering Period (pursuant to Section 6.01), as well as the Purchase Price and the number of shares of Common Stock covered by each option under the Plan which has not yet been exercised shall be proportionately adjusted for any Change in Capitalization.  Such adjustment shall be made by the Board, whose determination in that respect shall be final, binding and conclusive.  Except as expressly provided herein, no issuance by the Company of shares of stock of any class shall affect, and no adjustment by reason thereof shall be made with respect to, the number or Purchase Price of shares of Common Stock subject to an option.
13.03.2Change in Control.  In the event of a Change in Control, the Offering Period during which the Change in Control would otherwise occur shall be accelerated and shall end on the last payroll date immediately preceding the Change in Control.
13.04Amendment or Termination.  The Board shall have complete power and authority to terminate or amend the Plan; provided, however, that the Board shall not, without the approval of the shareholders of the Company, alter (i) the aggregate number of shares of Common Stock which may be issued under the Plan (except pursuant to Section 13.03 above), or (ii) the class of Employees eligible to receive options under the Plan, other than to designate Subsidiaries as Designated Subsidiary Corporations; and provided further, however, that, subject to Section 13.05 no termination, modification, or amendment of the Plan may, without the consent of an Employee then having an option under the Plan to purchase shares of Common Stock, adversely affect the rights of such Employee under such option.  In addition, and notwithstanding anything contained in this Plan to the contrary, to the extent necessary under Section 423 of the Internal Revenue Code (or any successor rule or provision or any applicable law or regulation), the Company shall obtain stockholder approval in such a manner and to such a degree as so required.
13.05The Committee shall be entitled to change the Offering Periods, limit the frequency and/or number of changes in the amount withheld during an Offering Period, establish the exchange ratio applicable to amounts withheld in a currency other than U.S. dollars, permit payroll withholding in excess of the amount designated by a participant in order to adjust for delays or mistakes in the Company’s processing of properly completed withholding elections, establish reasonable waiting and adjustment periods and/or accounting and crediting procedures to ensure that amounts applied toward the purchase 
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of Common Stock for each participant properly correspond with amounts withheld from the participant’s Compensation, and establish such other limitations or procedures as the Board (or its committee) determines in its sole discretion advisable which are consistent with the Plan, in each case so long as any such action is consistent with Section 423 of the Code.  None of the foregoing actions shall be considered to have adversely affected any right of any participant.
13.06In the event that the Committee determines that the ongoing operation of the Plan may result in unfavorable financial accounting consequences, the Committee may, in its discretion and, to the extent necessary or desirable, modify or amend the Plan to reduce or eliminate such accounting consequence including, but not limited to:
13.06.1changing the Purchase Price for any Offering Period including an Offering Period underway at the time of the change in Purchase Price;
13.06.2shortening any Offering Period so that the Offering Period ends on a new Exercise Date, including an Offering Period underway at the time of such action; and
13.06.3allocating shares of Common Stock to participants pursuant to Section 7.01 hereof.
None of the foregoing actions shall be considered to have adversely affected any right of any participant.
13.07Notices.  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 in the form specified by the Company by the Plan Representative.
13.08Conditions Upon Issuance of Shares.  Shares shall not be issued with respect to an option unless the exercise of such option and the issuance and delivery of such shares pursuant thereto shall comply with all applicable provisions of law, domestic or foreign, including, without limitation, the Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as amended, the rules and regulations promulgated thereunder, and the requirements of any stock exchange upon which the shares may then be listed, and shall be further subject to the approval of counsel for the Company with respect to such compliance.  As a condition to the exercise of an option, the Company may require the person exercising such option to represent and warrant at the time of any such exercise that the shares are being purchased only for investment and without any present intention to sell or distribute such shares if, in the opinion of counsel for the Company, such a representation is required by any of the aforementioned applicable provisions of law.
13.09Effective Date.  The Plan shall become effective as of its adoption by the Board, subject to approval by the holders of a majority of the shares of Common Stock, and shall continue in effect until the shares of Common Stock reserved for issuance under the Plan 
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have been depleted, unless sooner terminated under Section 13.04 hereof.  If the Plan is not so approved, the Plan shall not become effective.
13.10No Employment Rights.  The Plan does not, directly or indirectly, create in any person any right with respect to employment or continuation of employment by the Company or any Subsidiary, and it shall not be deemed to interfere in any way with the Company’s or any Subsidiary’s right to terminate, or otherwise modify, any Employee’s employment at any time.
13.11Effect of Plan.  The provisions of the Plan shall, in accordance with its terms, be binding upon, and inure to the benefit of, all successors of each Employee participating in the Plan, including, without limitation, such Employee’s estate and the executors, administrators or trustees thereof, heirs and legatees, and any receiver, trustee in bankruptcy or representative of creditors of such Employee.
13.12Governing Law.  The law of the State of Delaware will govern all matters relating to this Plan except to the extent superseded by the federal laws of the United States.

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APPENDIX A
A “Change in Control” shall be deemed to have occurred if, following the “Distribution” (as defined in the Master Separation Agreement, dated March 27, 2000, to which the Company and Cabot Corporation are parties):
(a)any “person” as such term is used in Sections 13(d) and 14(d) of the 1934 Act (other than (i) the Company, (ii) any subsidiary of the Company, (iii) any trustee or other fiduciary holding securities under an employee benefit plan of the Company or of any subsidiary of the Company, or (iv) any company owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their ownership of stock of the Company), is or becomes the “beneficial owner” (as defined in Section 13(d) of the 1934 Act), together with all Affiliates and Associates (as such terms are used in Rule 12b-2 of the General Rules and Regulations under the 1934 Act) of such person, directly or indirectly, of securities of the Company representing 30% or more of the combined voting power of the Company’s then outstanding securities; or
(b)the stockholders of the Company approve a merger or consolidation of the Company with any other company, other than (i) a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity), in combination with the ownership of any trustee or other fiduciary holding securities under an employee benefit plan of the Company or any subsidiary of the Company, at least 60% of the combined voting power of the voting securities of the Company or such surviving entity outstanding immediately after such merger or consolidation or (ii) a merger or consolidation effected to implement a recapitalization of the Company (or similar transaction) after which no “person” (with the method of determining “beneficial ownership” used in clause (a) of this definition) owns more than 30% of the combined voting power of the securities of the Company or the surviving entity of such merger or consolidation; or
(c)during any period of two consecutive years (not including any period prior to the execution of the Plan), individuals who at the beginning of such period constitute the Board, and any new director (other than a director designated by a person who has conducted or threatened a proxy contest, or has entered into an agreement with the Company to effect a transaction described in clause (a), (b) or (d) of this definition) whose election by the Board or nomination for election by the Company’s stockholders was approved by a vote of at least two-thirds (2/3) of the directors then still in office who either were directors at the beginning of the period or whose election or nomination for election was previously so approved cease for any reason to constitute at least a majority thereof; or
(d)the stockholders of the Company approve a plan of complete liquidation of the Company or an agreement for the sale or disposition by the Company of all or substantially all of the Company’s assets.
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