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                                                                     EXHIBIT 4.1

                             Mykrolis Corporation

                          2001 EQUITY INCENTIVE PLAN

1.  DEFINED TERMS

    Exhibit A, which is incorporated by reference, defines the terms used in
the Plan and sets forth certain operational rules related to those terms.

2.  GENERAL

    The Plan has been established to advance the interests of the Company by
giving Stock-based and other incentives to selected Employees, directors and
other persons (including both individuals and entities) who provide services to
the Company or its Affiliates.

3.  ADMINISTRATION

    The Administrator has discretionary authority, subject only to the express
provisions of the Plan, to interpret the Plan; determine eligibility for and
grant Awards; determine, modify or waive the terms and conditions of any Award;
prescribe forms, rules and procedures (which it may modify or waive); and
otherwise do all things necessary to carry out the purposes of the Plan.  Once
an Award has been communicated in writing to a Participant, the Administrator
may not, without the Participant's consent, alter the terms of the Award so as
to affect adversely the Participant's rights under the Award, unless the
Administrator expressly reserved the right to do so.  In the case of any Award
intended to be eligible for the performance-based compensation exception under
Section 162(m), the Administrator shall exercise its discretion consistent with
qualifying the Award for such exception.

4.  LIMITS ON AWARD UNDER THE PLAN

a.  Number of Shares.

    A maximum of (1) [    ] shares of Stock, plus (2) an annual increase to be
added on the date of each annual meeting of the stockholders of the Company,
beginning with the 2002 annual meeting of the stockholders, equal to one percent
(1.0%) of the outstanding shares of Stock on such date or such lesser amount
determined by the Board, may be delivered in satisfaction of Awards under the
Plan.  The shares of Stock may be authorized, but unissued, or reacquired shares
of Stock.  For purposes of the preceding sentence, the following shares shall
not be considered to have been delivered under the Plan:  (i)  shares remaining
under an Award that terminates without having been exercised in full;  (ii)
shares subject to an Award,

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where cash is delivered to a Participant in lieu of such shares; (iii) shares of
Restricted Stock that have been forfeited in accordance with the terms of the
applicable Award; and (iv) shares held back, in satisfaction of the exercise
price or tax withholding requirements, from shares that would otherwise have
been delivered pursuant to an Award. The number of shares of Stock delivered
under an Award shall be determined net of any previously acquired Shares
tendered by the Participant in payment of the exercise price or of withholding
taxes. A maximum of [ ] shares of Stock may be issued as ISO Awards under the
Plan.

    b.  Type of Shares.

    Stock delivered by the Company under the Plan may be authorized but
unissued Stock or previously issued Stock acquired by the Company and held in
treasury.  No fractional shares of Stock will be delivered under the Plan.

    c.  Option & SAR Limits.

    The maximum number of shares of Stock for which Stock Options may be
granted to any person in any calendar year, the maximum number of shares of
Stock subject to SARs granted to any person in any calendar year and the
aggregate maximum number of shares of Stock subject to other Awards that may be
delivered to any person in any calendar year shall each be 1,000,000.  For
purposes of the preceding sentence, the repricing of a Stock Option or SAR shall
be treated as a new grant to the extent required under Section 162(m).  Subject
to these limitations, each person eligible to participate in the Plan shall be
eligible in any year to receive Awards covering up to the full number of shares
of Stock then available for Awards under the Plan.

    d.  Other Award Limits.

    No more than $1,000,000 may be paid to any individual with respect to any
Cash Performance Award.  In applying the limitation of the preceding sentence:
(A) multiple Cash Performance Awards to the same individual that are determined
by reference to performance periods of one year or less ending with or within
the same fiscal year of the Company shall be subject in the aggregate to one
limit of such amount, and (B) multiple Cash Performance Awards to the same
individual that are determined by reference to one or more multi-year
performance periods ending in the same fiscal year of the Company shall be
subject in the aggregate to a separate limit of such amount.  With respect to
any Performance Award other than a Cash Performance Award or a Stock Option or
SAR, the maximum Award opportunity shall be 1,000,000 shares of Stock or their
equivalent value in cash, subject to the limitations of Section 4.c.

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5.  ELIGIBILITY AND PARTICIPATION

    The Administrator will select Participants from among those key Employees,
directors and other individuals or entities providing services to the Company or
its Affiliates who, in the opinion of the Administrator, are in a position to
make a significant contribution to the success of the Company and its
Affiliates.  Eligibility for ISOs is further limited to those individuals whose
employment status would qualify them for the tax treatment described in Sections
421 and 422 of the Code.

6.  RULES APPLICABLE TO AWARDS

All Awards. Terms of Awards.  The Administrator shall determine the terms of all
Awards subject to the limitations provided herein.  In the case of an ISO, the
term shall be ten (10) years from the date of grant or such shorter term as may
be provided in the Award. Moreover, in the case of an ISO granted to a
Participant who, at the time the ISO is granted, owns stock representing more
than ten percent (10%) of the total combined voting power of all classes of
capital stock of the Company or any Parent or Subsidiary, the term of the ISO
shall be five (5) years from the date of grant or such shorter term as may be
provided in the Award.

Performance Criteria.  Where rights under an Award depend in whole or in part on
satisfaction of Performance Criteria, actions by the Company that have an
effect, however material, on such Performance Criteria or on the likelihood that
they will be satisfied will not be deemed an amendment or alteration of the
Award.

Alternative Settlement.  The Company may at any time extinguish rights under an
Award in exchange for payment in cash, Stock (subject to the limitations of
Section 4) or other property on such terms as the Administrator determines,
provided the holder of the Award consents to such exchange.

         (1)  Transferability Of Awards. Except as the Administrator otherwise
expressly provides, Awards may not be transferred other than by will or by the
laws of descent and distribution, and during a Participant's lifetime an Award
requiring exercise may be exercised only by the Participant (or in the event of
the Participant's incapacity, the person or persons legally appointed to act on
the Participant's behalf).

         (2)  Vesting, Etc. Without limiting the generality of Section 3, the
Administrator may determine the time or times at which an Award will vest (i.e.,
become free of forfeiture restrictions) or become exercisable and the terms on
which an Award requiring exercise will remain exercisable. Unless the
Administrator expressly provides otherwise, immediately upon the cessation of
the Participant's employment or other service relationship with the Company and
its Affiliates an Award requiring exercise will cease to be exercisable and all
Awards to the extent not already fully vested will be forfeited, except that:

              (A) all Stock Options and SARs held by a Participant immediately
         prior to his or her death, to the extent then exercisable, will remain
         exercisable by such Participant's executor or administrator or the
         person or persons to

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         whom the Stock Option or SAR is transferred by will or the applicable
         laws of descent and distribution, and to the extent not then
         exercisable will vest and become exercisable upon such Participant's
         death by such Participant's executor or administrator or the person or
         persons to whom the Stock Option or SAR is transferred by will or the
         applicable laws of descent and distribution, in each case for the
         lesser of (i) a one year period ending with the first anniversary of
         the Participant's death or (ii) the period ending on the latest date on
         which such Stock Option or SAR could have been exercised without regard
         to this Section 6.a.(5) and shall thereupon terminate;

              (B) all Stock Options and SARs held by the Participant immediately
         prior to the cessation of the Participant's employment or other service
         relationship for reasons other than death and except as provided in (C)
         below, to the extent then exercisable, will remain exercisable for the
         lesser of (i) a period of three months or (ii) the period ending on the
         latest date on which such Stock Option or SAR could have been exercised
         without regard to this Section 6.a.(5), and shall thereupon terminate;
         and

              (C) all Stock Options and SARs held by the Participant whose
         cessation of employment or other service relationship is determined by
         the Administrator in its sole discretion to result for reasons which
         cast such discredit on the Participant as to justify immediate
         termination of the Award shall immediately terminate upon such
         cessation.

Unless the Administrator expressly provides otherwise, a Participant's
"employment or other service relationship with the Company and its Affiliates"
will be deemed to have ceased, in the case of an employee Participant, upon
termination of the Participant's employment with the Company and its Affiliates
(whether or not the Participant continues in the service of the Company or its
Affiliates in some capacity other than that of an employee of the Company or its
Affiliates), and in the case of any other Participant, when the service
relationship in respect of which the Award was granted terminates (whether or
not the Participant continues in the service of the Company or its Affiliates in
some other capacity).

Taxes.  The Administrator will make such provision for the withholding of taxes
as it deems necessary.  The Administrator may, but need not, hold back shares of
Stock from an Award or permit a Participant to tender previously owned shares of
Stock in satisfaction of tax withholding requirements, but not in excess of the
minimum tax withholding rates applicable to the employee.

         (3)  Dividend Equivalents, Etc. The Administrator may provide for the
payment of amounts in lieu of cash dividends or other cash distributions with
respect to Stock subject to an Award.

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         (4)  Rights Limited. Nothing in the Plan shall be construed as giving
any person the right to continued employment or service with the Company or its
Affiliates, or any rights as a shareholder except as to shares of Stock actually
issued under the Plan. The loss of existing or potential profit in Awards will
not constitute an element of damages in the event of termination of employment
or service for any reason, even if the termination is in violation of an
obligation of the Company or Affiliate to the Participant.

         (5)  Section 162(m). In the case of an Award intended to be eligible
for the performance-based compensation exception under Section 162(m), the Plan
and such Award shall be construed to the maximum extent permitted by law in a
manner consistent with qualifying the Award for such exception.

    b.   Awards Requiring Exercise.Time And Manner Of Exercise. Unless the
         Administrator expressly provides otherwise, (a) an Award requiring
         exercise by the holder will not be deemed to have been exercised until
         the Administrator receives a written notice of exercise (in form
         acceptable to the Administrator) signed by the appropriate person and
         accompanied by any payment required under the Award; and (b) if the
         Award is exercised by any person other than the Participant, the
         Administrator may require satisfactory evidence that the person
         exercising the Award has the right to do so.

         (1)  Exercise Price. The Administrator shall determine the exercise
price of each Stock Option provided that each Stock Option intended to qualify
for the performance-based exception under Section 162(m) of the Code and each
ISO must have an exercise price that is not less than the fair market value of
the Stock subject to the Stock Option, determined as of the date of grant. An
ISO granted to an Employee described in Section 422(b)(6) of the Code must have
an exercise price that is not less than 110% of such fair market value.

         (2)  Payment Of Exercise Price, If Any. Where the exercise of an Award
is to be accompanied by payment: (a) all payments will be by cash or check
acceptable to the Administrator, or, if so permitted by the Administrator (with
the consent of the optionee of an ISO if permitted after the grant), (i) through
the delivery of shares of Stock which have been outstanding for at least six
months (unless the Administrator approves a shorter period) and which have a
fair market value equal to the exercise price, (ii) by delivery of a promissory
note of the person exercising the Award to the Company, payable on such terms as
are specified by the Administrator, (iii) by delivery of an unconditional and
irrevocable undertaking by a broker to deliver promptly to the Company
sufficient funds to pay the exercise price, or (iv) by any combination of the
foregoing permissible forms of payment; and (b) where shares of Stock issued
under an Award are part of an original issue of shares, the Award shall require
an exercise price equal to at least the par value of such shares.

         (3)  ISOs. No ISO may be granted under the Plan after [ ], 2011, but
ISOs previously granted may extend beyond that date.

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    c. Awards Not Requiring Exercise.

    Awards of Restricted Stock and Unrestricted Stock may be made in return for
either (i) services determined by the Administrator to have a value not less
than the par value of the Awarded shares of Stock, or (ii) cash or other
property having a value not less than the par value of the Awarded shares of
Stock payable in such combination and type of cash, other property (of any kind)
or services as the Administrator may determine.

7.  EFFECT OF CERTAIN TRANSACTIONS

    a.  Mergers, Etc.

    In the event of a Covered Transaction, all outstanding Awards shall vest
and if relevant become exercisable and all deferrals, other than deferrals of
amounts that are neither measured by reference to nor payable in shares of
Stock, shall be accelerated, immediately prior to the Covered Transaction and
upon consummation of such Covered Transaction all Awards then outstanding and
requiring exercise shall be forfeited unless assumed by an acquiring or
surviving entity or its affiliate as provided in the following sentence.  In the
event of a Covered Transaction, unless otherwise determined by the
Administrator, all Awards that are payable in shares of Stock and that have not
been exercised, exchanged or converted, as applicable, shall be converted into
and represent the right to receive the consideration to be paid in such Covered
Transaction for each share of Stock into which such Award is exercisable,
exchangeable or convertible, less the applicable exercise price or purchase
price for such Award.  In connection with any Covered Transaction in which there
is an acquiring or surviving entity, the Administrator may provide for
substitute or replacement Awards from, or the assumption of Awards by, the
acquiring or surviving entity or its affiliates, any such substitution,
replacement or assumption to be on such terms as the Administrator determines,
provided that no such replacement or substitution shall diminish in any way the
acceleration of Awards provided for in this section.

    b.  Changes in and Distributions with Respect to the Stock.Basic Adjustment
        Provisions. In the event of a stock dividend, stock split or combination
        of shares, recapitalization or other change in the Company's capital
        structure after [_____], 2001, the Administrator will make appropriate
        adjustments to the maximum number of shares that may be delivered under
        the Plan under Section 4.a., and will also make appropriate adjustments
        to the number and kind of shares of stock or securities subject to
        Awards then outstanding or subsequently granted, any exercise prices
        relating to Awards and any other provision of Awards affected by such
        change.

        Certain Other Adjustments. The Administrator may also make adjustments
        of the type described in paragraph (1) above to take into account
        distributions to common stockholders other than those provided for in
        Section 7.a. and 7.b.(1), or any other event, if the Administrator
        determines that adjustments are appropriate to avoid distortion in the
        operation of the Plan and to preserve the

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         value of Awards made hereunder; provided, that no such adjustment shall
         be made to the maximum share limits described in Section 4.c. or 4.d.,
         or otherwise to an Award intended to be eligible for the performance-
         based exception under Section 162(m), except to the extent consistent
         with that exception, nor shall any change be made to ISOs except to the
         extent consistent with their continued qualification under Section 422
         of the Code.

         (1)  Continuing Application of Plan Terms. References in the Plan to
shares of Stock shall be construed to include any stock or securities resulting
from an adjustment pursuant to Section 7.b.(1) or 7.b.(2) above.

8.  LEGAL CONDITIONS ON DELIVERY OF STOCK

    The Company will not be obligated to deliver any shares of Stock pursuant
to the Plan or to remove any restriction from shares of Stock previously
delivered under the Plan until the Company's counsel has approved all legal
matters in connection with the issuance and delivery of such shares; if the
outstanding Stock is at the time of delivery listed on any stock exchange or
national market system, the shares to be delivered have been listed or
authorized to be listed on such exchange or system upon official notice of
issuance; and all conditions of the Award have been satisfied or waived.  If the
sale of Stock has not been registered under the Securities Act of 1933, as
amended, the Company may require, as a condition to exercise of the Award, such
representations or agreements as counsel for the Company may consider
appropriate to avoid violation of such Act.  The Company may require that
certificates evidencing Stock issued under the Plan bear an appropriate legend
reflecting any restriction on transfer applicable to such Stock.

9.  AMENDMENT AND TERMINATION

    Subject to the last sentence of Section 3, the Administrator may at any
time or times amend the Plan or any outstanding Award for any purpose which may
at the time be permitted by law, or may at any time terminate the Plan as to any
further grants of Awards; provided, that (except to the extent expressly
required or permitted by the Plan) no such amendment will, without the approval
of the stockholders of the Company, effectuate a change for which stockholder
approval is required in order for the Plan to continue to qualify under Section
422 of the Code and for Awards to be eligible for the performance-based
exception under Section 162(m).

10. NON-LIMITATION OF THE COMPANY'S RIGHTS

    The existence of the Plan or the grant of any Award shall not in any way
affect the Company's right to Award a person bonuses or other compensation in
addition to Awards under the Plan.

11. GOVERNING LAW

    The Plan shall be construed in accordance with the laws of the State of
Delaware.

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                                   EXHIBIT A

Definition of Terms

     The following terms, when used in the Plan, shall have the meanings and be
subject to the provisions set forth below:

     "Administrator":  The Board or, if one or more has been appointed, the
Committee.

     "Affiliate":  Any corporation or other entity owning, directly or
indirectly, 50% or more of the outstanding Stock of the Company, or in which the
Company or any such corporation or other entity owns, directly or indirectly,
50% of the outstanding capital stock (determined by aggregate voting rights) or
other voting interests.

     "Award":  Any or a combination of the following:

          (i)    Stock Options.

          (ii)   SARs.

          (iii)  Restricted Stock.

          (iv)   Unrestricted Stock.

          (v)    Deferred Stock.

          (vi)   Securities (other than Stock Options) that are convertible into
     or exchangeable for Stock on such terms and conditions as the Administrator
     determines.

          (vii)  Cash Performance Awards.

          (viii) Performance Awards.

          (ix)   Grants of cash, or loans, made in connection with other Awards
     in order to help defray in whole or in part the economic cost (including
     tax cost) of the Award to the Participant.

     "Board":  The Board of Directors of the Company.

     "Cash Performance Award":  A Performance Award payable in cash.  The right
of the Company under Section 6.a.(3) to extinguish an Award in exchange for cash
or the

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exercise by the Company of such right shall not make an Award otherwise not
payable in cash a Cash Performance Award.

     "Code":  The U.S. Internal Revenue Code of 1986 as from time to time
amended and in effect, or any successor statute as from time to time in effect.

     "Committee":  One or more committees of the Board which in the case of
Awards granted to officers of the Company shall be comprised solely of two or
more outside directors within the meaning of Section 162(m).  Any Committee may
delegate ministerial tasks to such persons (including Employees) as it deems
appropriate.

     "Company":  Mykrolis Corporation

     "Covered Transaction":  Any of (i) a consolidation or merger in which the
Company is not the surviving corporation or which results in the acquisition of
all or substantially all of the Company's then outstanding common stock by a
single person or entity or by a group of persons and/or entities acting in
concert, (ii) a sale or transfer of all or substantially all the Company's
assets, or (iii) a dissolution or liquidation of the Company.

     "Deferred Stock":  A promise to deliver Stock or other securities in the
future on specified terms.

     "Employee":  Any person who is employed by the Company or an Affiliate.

     "ISO":  A Stock Option intended to be an "incentive stock option" within
the meaning of Section 422 of the Code.  No Stock Option Awarded under the Plan
will be an ISO unless the Administrator expressly provides for ISO treatment.

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

     "Participant":  An Employee, director or other person providing services to
the Company or its Affiliates who is granted an Award under the Plan.

     "Performance Award":  An Award subject to Performance Criteria.  The
Committee in its discretion may grant Performance Awards that are intended to
qualify for the performance-based compensation exception under Section 162(m)
and Performance Awards that are not intended so to qualify.

     "Performance Criteria":  Specified criteria the satisfaction of which is a
condition for  the exercisability, vesting or full enjoyment of an Award.  For
purposes of Performance Awards that are intended to qualify for the performance-
based compensation exception under Section 162(m), a Performance Criterion shall
mean an objectively determinable measure of performance relating to any of the
following (determined either on a consolidated basis or, as

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the context permits, on a divisional, subsidiary, line of business, project or
geographical basis or in combinations thereof): (i) sales; revenues; assets;
expenses; earnings before or after deduction for all or any portion of interest,
taxes, depreciation, amortization or other items, whether or not on a continuing
operations or an aggregate or per share basis; return on equity, investment,
capital or assets; one or more operating ratios; borrowing levels, leverage
ratios or credit rating; market share; capital expenditures; cash flow; stock
price; stockholder return; network deployment; sales of particular products or
services; customer acquisition, expansion and retention; or any combination of
the foregoing; or (ii) acquisitions and divestitures (in whole or in part);
joint ventures and strategic alliances; spin-offs, split-ups and the like;
reorganizations; recapitalizations, restructurings, financings (issuance of debt
or equity) and refinancings; transactions that would constitute a change of
control; or any combination of the foregoing. A Performance Criterion measure
and targets with respect thereto determined by the Administrator need not be
based upon an increase, a positive or improved result or avoidance of loss.

     "Plan":  The Mykrolis Corporation 2001 Equity Incentive Plan, as from time
to time amended and in effect.

     "Restricted Stock":  An Award of Stock subject to restrictions requiring
that such Stock be redelivered to the Company if specified conditions are not
satisfied.

     "Section 162(m)":  Section 162(m) of the Code.

     "SARs":  Rights entitling the holder upon exercise to receive cash or
Stock, as the Administrator determines, equal to a function (determined by the
Administrator using such factors as it deems appropriate) of the amount by which
the Stock has appreciated in value since the date of the Award.

     "Stock":  Common Stock of the Company, par value $ .01 per share.

     "Stock Options":  Options entitling the recipient to acquire shares of
Stock upon payment of the exercise price.

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

     "Unrestricted Stock":  An Award of Stock not subject to any restrictions
under the Plan.

                                       10Mykrolis Corporation 2003 Employment Inducement and Acquisition Stock Plan

 Exhibit 4.2 
  

MYKROLIS CORPORATION 
  
 2003 EMPLOYMENT INDUCEMENT AND ACQUISITION STOCK OPTION PLAN 
  
 1.    NAME AND PURPOSE.    This plan shall be called the Mykrolis Corporation
2003 Employment Inducement and Acquisition Stock Option Plan (the “Plan”). The Plan has been established to advance the interests of Mykrolis Corporation (“Mykrolis”) by providing a form of stock-based compensation which will
permit the Mykrolis to induce highly qualified individuals to accept employment with the Mykrolis or with any of its subsidiaries and will permit Mykrolis to retain qualified employees of companies acquired by Mykrolis or its subsidiaries.

  
 2.    EFFECTIVE DATE AND TERM OF THE
PLAN.    The Plan shall become effective as of July 1, 2003 (the “Effective Date”). Options may not be granted under the Plan after the tenth (l0th) anniversary of the Effective Date (the “Term”);
provided, however, that all options outstanding as of that date shall remain or become exercisable pursuant to their terms and the terms of the Plan. 
  
 3.    ADMINISTRATION.    The Plan shall be administered by the Board of Directors of the Mykrolis (the
“Board”) or by Management Development & Compensation Committee of the Board (the “Committee”) composed solely of two or more “Non-Employee Directors” (as such term is defined under Rule 16b-3 under the Securities
Exchange Act of 1934, as amended (the “Exchange Act”)). References herein to the Committee shall be deemed to refer to the Board in the event that the administration of the Plan has not been delegated to the Committee. The Committee may,
from time to time, establish such regulations, provisions and procedures, within the terms of the Plan, as in the opinion of its members may be advisable in the administration of the Plan. A majority of the members of the Committee shall constitute
a quorum, and the acts of a majority of a quorum at any meeting, or acts reduced to or approved in writing by a majority of the members of the Committee, shall be the valid acts of the Committee. The interpretation and construction by the Committee
of any provisions of the Plan or of any option granted pursuant to the Plan shall be final and binding upon Mykrolis and any optionee. No member of the Board of Directors of Mykrolis or the Committee shall be liable for any action or determination
made in good faith with respect to the Plan or any option granted pursuant thereto. 
  
 4.    STOCK AVAILABLE FOR AWARDS.    Subject to the adjustments as provided in Subsection 7.7, the aggregate number of shares of common stock, par value $.01 per share,
of Mykrolis (the “Common Stock”) reserved for issue under the Plan shall be the aggregate of (1) 350,000 shares of Common Stock, plus (2) an annual increase to be added on the date of each annual meeting of the stockholders of Mykrolis,
beginning with the 2004 annual meeting of the stockholders, equal to one quarter of one percent (0.25%) of the outstanding shares of Common Stock on such date or such lesser amount determined by the Board, The shares of Common Stock that may be
delivered in satisfaction of Awards and Options under the Plan. may be authorized, but unissued, or reacquired shares of Common Stock (the “Shares”). Determinations as to the number of Shares that remain available for issuance under the
Plan shall be made in accordance with such rules and procedures as the Committee shall determine from time to time. 

 If any outstanding option or other award under the Plan expires or is terminated for any reason before the end of the
Term of the Plan, the Shares allocable to the unexercised portion of such option shall become available for the grant of other options under the Plan. No shares delivered to Mykrolis in full or partial payment upon exercise of an option pursuant to
Subsection 7.3 or in full or partial payment of any withholding tax liability permitted under Section 11 shall become available for the grant of other awards under the Plan. 
  
 5.    PARTICIPATION.    Subject to the limitations contained in this Section
5, participants in the Plan (“Participants”) shall include: (i) any prospective or newly-hired employee or Rehire Employee (as defined in paragraph 6 below) of Mykrolis or any of its subsidiaries, in either case to the extent that
an award under this Plan is a material inducement to such person’s acceptance of employment with Mykrolis or a subsidiary of Mykrolis; and (ii) any employee of a company (the “Target”) that Mykrolis or any subsidiary of
Mykrolis acquires, to the extent that an award under this Plan is in connection with such person’s acceptance of employment with Mykrolis following the acquisition of Target by Mykrolis or a subsidiary of Mykrolis. Participants will be eligible
to be granted options to purchase Shares in accordance and consistent with the terms and conditions of the Plan. Except as provided herein, terms and conditions of options granted to a Participant at any given time need not be the same for any other
grant of options. 
  
 6.    AWARDS.    Awards under this Plan may consist of any or a combination of stock options, restricted stock awards, unrestricted stock awards, deferred stock awards, or awards of securities
(other than stock options) convertible into or exchangeable for Shares on such terms as the Committee determines. Awards may be granted under this Plan: (i) as a material employment inducement to persons being hired by Mykrolis or any
subsidiary of Mykrolis, and to persons rehired by Mykrolis or any subsidiary of Mykrolis following a bone fide period of interruption of employment (a “Rehire Employee”); or (ii) to convert, replace or adjust outstanding options
held by a person employed by any Target to reflect the acquisition of Target by Mykrolis or a subsidiary of Mykrolis. Subject to the foregoing, the Committee shall be authorized to determine from time to time the Participants to be granted Awards,
the number of Shares subject to such Awards, and the terms and conditions of the Awards to be granted. All Awards granted under this Section must be approved by either the Board or the Committee prior to such grant.  
  
 6.1.    Notice of
Awards.    To the extent required by applicable regulations of the Securities & Exchange Commission and of the New York Stock Exchange, Mykrolis shall: (i) provide the New York Stock Exchange with written
notice of each Award under this Plan; and (ii) promptly disclose all employment inducement Awards under this Plan in a press release describing the material terms of the award, including the recipient(s) of the Award and the number of shares
involved in the Award. Failure to comply with the provisions of this Subsection 6.1 shall not invalidate any Award grant or in any way impair or invalidate the exercise thereof. 
  
 7.    TERMS AND CONDITIONS OF OPTIONS GRANTED UNDER THE PLAN.    All stock
options granted under the Plan shall be non-statutory options not intended to qualify under Section 422 of the Internal Revenue Code of 1986, as amended (the “Code”). Each stock option granted under the Plan shall provide that such option
will not be treated as an “incentive stock option,” as that term is defined in Section 422(b) of the Code. All stock options granted under this Plan 
  

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 shall be evidenced by agreements in such form as the Committee shall from time to time approve, which agreements shall
comply with and be subject to the following conditions: 
  
 7.1.    Term of Options.    The term of each option shall be for a period of not greater than ten (10) years from the date of grant of the option.

  
 7.2.    Option Price.    The exercise price of each option shall be equal to one hundred percent (100%) of the Fair Market Value of the shares of Common Stock on the date of the
grant of the option. As used herein the term “Fair Market Value” shall mean the closing price of a share of Mykrolis Common Stock on the New York Stock Exchange (“NYSE”) on the day the option is granted or if no sale of shares of
Common Stock is reflected on the NYSE on that day, on the next preceding day on which there was a sale of shares of Common Stock reflected on the NYSE. 
  
 7.3.    Medium of Payment.    The option exercise price shall be payable to
Mykrolis in United States dollars in cash or by check, bank draft, or money order payable to the order of Mykrolis or if permitted by the Committee: (i) through the delivery of shares of the Common Stock with a Fair Market Value on the date
of the exercise equal to the option price, provided such shares are used as payment to acquire not less than 100 Shares, (ii) by delivery of an unconditional and irrevocable undertaking by a broker to deliver promptly to Mykrolis
sufficient funds to pay the exercise price, or (iii) by a combination of the above. Fair Market Value will be determined in the manner specified in Subsection 7.2 except as to the date of determination. 
  
 7.4.    Exercise of
Options.    Except, in the case of awards made pursuant to Section 6(ii), to the extent more favorable to the Participant than the terms of the Target award being converted, replaced or adjusted, the Committee shall have
the authority to determine, at the time of grant of each option pursuant to Section 6, the times at which an option may be exercised and any conditions precedent to the exercise of an option. An option shall be exercisable upon written notice to the
Chief Financial Officer of Mykrolis or his or her designee, as to any or all Shares covered by the option, until its termination or expiration in accordance with its terms or the provisions of the Plan. Notwithstanding the foregoing, an option shall
not at any time be exercisable with respect to less than 100 Shares unless the remaining Shares covered by an option are less than 100 Shares. The option exercise price for the Shares purchased pursuant to an option shall be paid in full upon
delivery to the optionee of certificates for such Shares. Exercise by an optionee’s heir or personal representative shall be accompanied by evidence of his or her authority to act, in a form reasonably satisfactory to Mykrolis. 
  
 7.5.    Termination of a
Participant’s Service with Mykrolis for any Reason Other than Death, etc.    Except, in the case of awards made pursuant to Section 6(ii), to the extent more favorable to the Participant than the terms of the Target
award being converted, replaced or adjusted, in the event an optionee shall cease to serve Mykrolis or any subsidiary of Mykrolis as an employee for any reason other than such optionee’s death or Permanent Disability (as defined in Subsection
7.6 below), each option held by such optionee shall, to the extent rights to purchase shares under the option have been accrued at the time such optionee ceases to serve as an employee, remain exercisable, in whole or in part, by the optionee,
subject to prior expiration according to its terms and other limitations imposed by the Plan, for a period of ninety (90) days following the 
  

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 optionee’s cessation of service as an employee of Mykrolis. If the optionee dies after such
cessation of service, the optionee’s options shall be exercisable in accordance with Subsection 7.6 hereof. 
  
 7.6.    Termination of Service for Death or Permanent Disability.    Except,
in the case of awards made pursuant to Section 6(ii), to the extent more favorable to the Participant than the terms of the Target award being converted, replaced or adjusted, if an optionee ceases to be an employee by reason of death or Permanent
Disability, each option held by such optionee shall immediately become exercisable and shall remain exercisable, in whole or in part, by (in the case of Permanent Disability) the optionee or (in the case of death) the personal representative of the
optionee’s estate. If an optionee dies or a Permanent Disability occurs during the extended exercise period following cessation of service specified in Subsection 7.5 above, such option may be exercised any time within the longer of such
extended period or one (1) year after death or Permanent Disability, subject to the prior expiration of the term of the option. For purposes of this Subsection, “Permanent Disability” shall mean a determination by the Social
Security Administration or any similar successor agency that an optionee is “permanently disabled,” and the date on which a Permanent Disability is deemed to have occurred shall be the date on which such determination by such agency shall
have been made. 
  
 7.7.    Adjustment in Shares Covered by an Option.    Shares covered by options shall be subject to adjustment as follows: 
  
 7.7.1.    Stock Splits and
Dividends, etc.    The number of shares covered by each outstanding option, and the purchase price per share thereof, shall be proportionately adjusted for any increase or decrease in the number of issued and outstanding
shares resulting from a split in or combination of shares or the payment of a stock dividend on the shares or any other increase or decrease in the number of such shares effected without receipt of consideration by Mykrolis. 
  
 7.7.2.    Acquisitions.    If Mykrolis shall be the surviving corporation in any merger or consolidation or if Mykrolis is merged into a wholly-owned subsidiary solely for
purposes of changing Mykrolis’s state of incorporation, each outstanding option shall pertain to and apply to the securities to which a holder of the number of shares subject to the option would have been entitled to receive in such
transaction. 
  
 7.7.3.    Merger or Consolidation where Mykrolis is not the Survivor.    In the event of: (i) a consolidation or merger in which Mykrolis is not the surviving corporation
or which results in the acquisition of all or substantially all of Mykrolis’ then outstanding common stock by a single person or entity or by a group of persons and/or entities acting in concert; (ii) a sale or transfer of all or
substantially all Mykrolis’ assets, or (iii) a dissolution or liquidation of Mykrolis; then all outstanding options shall vest and if relevant become exercisable and all deferrals, other than deferrals of amounts that are neither
measured by reference to nor payable in shares of Stock, shall be accelerated, immediately prior to any such transaction and upon consummation of such transaction all options then outstanding and 
  
  

 4 

 requiring exercise shall be forfeited unless assumed by an acquiring or surviving entity or its affiliate
as provided in the following sentence. In the event of a any such transaction, unless otherwise determined by the Board, all Awards that are payable in shares of Stock and that have not been exercised, exchanged or converted, as applicable, shall be
converted into and represent the right to receive the consideration to be paid in such transaction for each share of Stock into which such option is exercisable, exchangeable or convertible, less the applicable exercise price or purchase price for
such option. In connection with any such transaction in which there is an acquiring or surviving entity, the Board may provide for substitute or replacement options from, or the assumption of options by, the acquiring or surviving entity or its
affiliates, any such substitution, replacement or assumption to be on such terms as the Board determines, provided that no such replacement or substitution shall diminish in any way the acceleration of options provided for in this subsection.

  
 7.7.4.    Change in Par Value.    In the event of a change in the shares as presently constituted, which is limited to a change of all of its authorized shares with par value into
the same number of shares with a different par value or without par value, the shares resulting from any such change shall be deemed to be the Shares within the meaning of the Plan. 
  
 To the extent that the foregoing adjustments relate to stock or securities of Mykrolis, such adjustments
shall be made by the Board, whose determination in that respect shall be final, binding and conclusive. Any such adjustment may provide for the elimination of any fractional share which might otherwise become subject to an option. Except as
expressly provided in this Subsection 7.7, the optionee shall have no rights by reason of any split or combination of shares of stock of any class or the payment of any stock dividend or any other increase or decrease in the number of shares of
stock of any class or by reason of any dissolution, liquidation, merger, or consolidation or spin-off of assets or stock of another corporation, and any issue by Mykrolis of shares of stock of any class, or securities convertible into shares of
stock of any class, shall not affect, and no adjustment by reason thereof shall be made with respect to, the number or price of shares of stock subject to the option. The grant of an option pursuant to the Plan shall not affect in any way the right
or power of Mykrolis to make adjustments, reclassifications, reorganizations, or changes of its capital or business structure, or to merge or to consolidate or to dissolve, liquidate or sell, or transfer all or any part of its business or assets.

  
 7.8.    Rights of a Stockholder.    An optionee shall have no rights as a stockholder with respect to any Shares covered by his or her option until the date on which the optionee
becomes the holder of record of such Shares. No adjustment shall be made for dividends, distributions, or other rights for which the record date is prior to the date on which he or she shall have become the holder of record thereof, except as
provided in Subsection 7.7. 
  
 7.9.    Postponement of Delivery of Shares and Representations.    Mykrolis, in its discretion, may postpone the issuance and/or delivery of Shares upon any exercise of an option
until completion of the registration or other qualification of the Common Stock under any state and/or federal law, rule or regulation or the listing of the Common Stock 
  

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 on such securities exchange, as Mykrolis may consider appropriate, and may require any person exercising
an option to make such representations, including a representation that it is the optionee’s intention to acquire Shares for investment and not with a view to distribution thereof, and furnish such information as it may consider appropriate in
connection with the issuance or delivery of the Shares in compliance with applicable laws, rules, and regulations. In such event no Shares shall be issued to such optionee unless and until Mykrolis is satisfied with the accuracy of any such
representations. 
  
 7.10.    Non-Transferability.    Except as the Committee otherwise expressly provides subject, in the case of awards made pursuant to Section 6(ii), to the extent more favorable
to the Participant than the terms of the Target award being converted, replaced or adjusted, the options granted pursuant to the Plan may not be transferred by an optionee other than by will or by the laws of descent and distribution, and during an
optionee’s lifetime an option may be exercised only by the optionee (or in the event of the optionee’s incapacity, the person or persons legally appointed to act on the optionee’s behalf). 
  
 7.11.    Other
Provisions.    The option agreements authorized under the Plan shall contain such other provisions, including, without limitation, restrictions upon the exercise of the option, as the Committee shall deem
advisable. 
  
 8.    ADDITION OF
TARGET SHARES TO THE PLAN.    Shares available for grant under a pre-existing (within the meaning of the applicable New York Stock Exchange rules) stock option plan of a Target that was approved by the stockholders of the
Target may be added to the pool of shares specified in Section 4 above subject to the following conditions: 
  

	 	•	 	the number of shares added to the Plan shall be appropriately adjusted to reflect the acquisition transaction; 

  

	 	•	 	the time during which the shares added to the Plan hereunder are available for grant is not extended beyond the period when they would have been available under the pre-existing
Target plan, absent the transaction; and 

  

	 	•	 	the options and other awards are not granted to individuals who were employed, immediately before the acquisition transaction, by Mykrolis or any subsidiary of Mykrolis existing
prior to the acquisition transaction. 

  
 9.    ADJUSTMENTS IN SHARES AVAILABLE FOR OPTIONS.    The adjustments in number and kind of shares and the substitution of Shares, affecting outstanding options in accordance with Subsection
7.7 hereof, shall also apply to the number and kind of Shares issuable upon the exercise of options to be granted pursuant to Section 6 and the number and kind of Shares reserved for issuance pursuant to the Plan, but not yet covered by options.

  
 10.    AMENDMENT OF THE
PLAN.    The Board, insofar as permitted by law, shall have the right from time to time, with respect to any Shares at the time not subject to options, to suspend or discontinue the Plan or revise or amend it in any
respect whatsoever. 
  
 11.    WITHHOLDING
OF TAXES.    Mykrolis shall have the right to deduct from any payment to be made pursuant to this Plan, or to otherwise require, prior to the issuance or delivery of any Shares, payment by the optionee of any federal, state,
or local taxes required by law to be 
  

 6 

 withheld. Unless otherwise prohibited by the Committee, an optionee may satisfy any such withholding tax obligation by
any of the following means or by a combination of such means: (i) tendering a cash payment; (ii) authorizing Mykrolis to withhold from the Shares otherwise issuable to the optionee a number of Shares having a Fair Market Value as of
the Tax Date (as defined below) equal to the amount of withholding tax obligation; or (iii) delivering to Mykrolis unencumbered shares of Common Stock owned by the optionee having a Fair Market Value, as of the Tax Date, equal to the amount
of the withholding tax obligation. The “Tax Date” shall be the date that the amount of tax to be withheld is determined. Fair Market Value shall be determined in the manner specified in Subsection 7.2, except as to the date of
determination. An optionee’s election to pay the withholding tax obligation by either of (ii) or (iii) above shall be irrevocable, is subject to prior approval by the Committee, and must be made either six (6) months prior to the Tax Date or
during the period beginning on the third business day following the date of release of Mykrolis’ quarterly or annual summary statement of sales and earnings and ending on the tenth business day following such date. 
  
 12.    RIGHT OF MYKROLIS TO TERMINATE
PARTICIPANT’S SERVICE.    Nothing in this Plan or in the grant of any option hereunder shall in any way limit or affect the right of Mykrolis to terminate the employment of any Participant or optionee. 
  
 13.    APPLICATION OF
FUNDS.    The proceeds received by Mykrolis from the sale of Shares pursuant to options will be used for general corporate purposes. 
  
 14.    NO OBLIGATION TO EXERCISE OPTION.    The granting of an option shall impose no obligation on
the optionee to exercise such option. 
  
 15.    CONSTRUCTION.    This Plan shall be construed under the laws of the State of Delaware. 
  

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