Document:

Exhibit 4.3
DESCRIPTION OF SECURITIES
References to “we”, “us”, “Trinseo” or the “Company” herein are, unless the context otherwise indicates, only to Trinseo PLC and not to any of its subsidiaries.
General
The following is a summary of information concerning capital stock of Trinseo PLC.  The summaries and descriptions below do not purport to be complete statements of the relevant provisions of the Company’s Memorandum and Articles of Association (“Articles”) and are entirely qualified by the Articles.
Ordinary Shares
Outstanding Shares.  The Company currently has 37,046,528 outstanding ordinary shares with a nominal value of $0.01 per share (the “Ordinary Shares”), and 25,000 deferred ordinary shares with a nominal value of €1.00 each.
The outstanding shares include 25,000 deferred ordinary shares of €1.00 each, which were created solely to satisfy minimum statutory capital requirements that apply to all Irish public limited companies. The holders of the deferred ordinary shares are not entitled to receive any dividend or distribution, to attend, speak or vote at any general meeting, and effectively have no rights to participate in the assets of Trinseo PLC on a winding-up.
The Articles authorize the Trinseo Board of Directors (the “Board”) to issue shares of Trinseo PLC with an aggregate par value amount up to the maximum of its authorized but unissued share capital, without approval from shareholders. The Board is also authorized to issue preferred shares, with discretion as to the terms attaching to the preferred shares, including as to voting, dividend and conversion rights and priority relative to other classes of shares with respect to dividends and upon a liquidation. 
The authority to issue new shares in Trinseo PLC extends until five years, for a period of five years from the date of adoption of the Articles, at which time it will expire unless renewed by Trinseo’s shareholders.
Authorized Share Capital.  The Company has an authorized share capital of US$50,000,000 and €25,000, comprised of 4,000,000,000 ordinary shares of US$0.01 each, 1,000,000,000 preferred shares of €0.01 each, and 25,000 deferred ordinary shares of €1.00 each.
The authorized share capital may be increased or reduced by a resolution approved by a simple majority of the votes cast at a general meeting of shareholders of Trinseo PLC, referred to under Irish law as an “ordinary resolution.”
Irish law does not recognize fractional shares held of record. Accordingly, the Articles do not provide for the issuance of fractional shares, and our official Irish share register will not reflect any fractional shares.
Dividends.  Under Irish law, the Company is permitted to declare dividends and make distributions only out of “distributable profits.” Distributable profits are the accumulated realized profits of the Company that have not previously been utilized in a distribution or capitalization less accumulated realized losses that have not previously been written off in a reduction or reorganization of capital, and include reserves created by way of a reduction of capital. In addition, no distribution or dividend may be paid or made by the Company unless its net assets are equal to, or exceed, the aggregate of its called-up share capital plus its 

undistributable reserves and the distribution does not reduce the Company’s net assets below such aggregate. Undistributable reserves include the undenominated capital, the capital redemption reserve fund and the amount by which the Company’s accumulated unrealized profits that have not previously been utilized by any capitalization exceed the Company’s accumulated unrealized losses that have not previously been written off in a reduction or reorganization of capital.
The determination as to whether the Company has sufficient distributable profits to fund a dividend must be made by reference to either the last unconsolidated annual audited financial statements, or other financial statements properly prepared in accordance with the Irish Companies Act, which give a “true and fair view” of the Company’s unconsolidated financial position and accord with accepted accounting practice and have been filed with the Irish Companies Registration Office.
The Articles authorize the Board to declare interim dividends without approval from shareholders if it considers that the Company’s financial position justifies such payment. The Board may also recommend a dividend to be approved and declared by Trinseo’s shareholders at a general meeting. No dividend issued may exceed the amount recommended by the Board. The Articles provide that dividends may be paid in cash, property or paid-up shares. Any cash payment may be made by check or warrant or sent by any electronic or other means of payment.
Except as otherwise provided by the rights attached to shares of the Company, all shares of the Company will carry a pro rata entitlement to the receipt of dividends, and no dividend or other monies payable by the Company in respect of a share in the Company shall bear interest.
If a dividend cannot be paid to a shareholder of the Company or otherwise remains unclaimed, the Board may pay it into a separate account and the Company will not be a trustee in respect thereof. A dividend that remains unclaimed for a period of six years from the date of its declaration will be forfeited and will revert to the Company.
Shareholder Rights
Voting Rights.  Under the Articles, each Trinseo shareholder is entitled to one vote for each Ordinary Share that they hold as of the record date for the meeting. A holder of the deferred ordinary shares is not entitled to a vote. No voting rights can be exercised in respect of any shares held as treasury shares, including shares held by subsidiaries.
All resolutions at an annual general meeting or other general meeting will be decided on a poll. On a poll every Trinseo shareholder who is present, in person or by proxy, at the general meeting, is entitled to one vote for every Ordinary Share held by such shareholder.
At a separate general meeting of the holders of any class of shares, all votes will be taken on a poll and each holder of shares of the class will, on a poll, have one vote in respect of every share of that class held by such shareholder.
Under the Irish Companies Act and the Articles, certain matters require “ordinary resolutions”, which must be approved by at least a majority of the votes cast, in person or by proxy, by shareholders at a general meeting, and certain other matters require “special resolutions”, which require the affirmative vote of at least 75% of the votes cast, in person or by proxy, by shareholders at a general meeting.
An ordinary resolution is needed (among other matters) to remove a director, provide, vary or renew the directors’ authority to allot shares and to appoint directors (where appointment is by shareholders, subject to certain exceptions such as where there is a contested director election, as is described below).

A special resolution is needed (among other matters) to: alter the Company’s Articles, exclude statutory preemptive rights on allotment of securities for cash (up to five years); reduce the Company’s share capital; re-register the Company as a private company; and approve a scheme of arrangement.
Cumulative voting is not recognized under Irish law.
Changes to Rights Attaching to a Class of Shares.  Under the Articles and the Irish Companies Act, any amendment of rights attaching to a class of the Company’s issued shares must be approved by a special resolution of our shareholders of the affected class or with the consent in writing of the holders of three-quarters of all the votes of that class of shares. 
Dissolution; Liquidation Rights.  The Company may be dissolved and wound up at any time by way of a shareholders’ voluntary winding, which requires a special resolution be approved of three-quarters of shareholders. The Company may also be dissolved by way of court order on the application of a creditor, or by the Irish Companies Registration Office as an enforcement measure if it has failed to file certain returns. The Company may also be dissolved by the Director of Corporate Enforcement in Ireland where its affairs have been investigated by an inspector and it appears from the report or any information obtained by the Director of Corporate Enforcement that the Company should be wound up.
Under the Articles, if the Company is wound up and the assets available for distribution are insufficient to repay the whole of the paid-up or credited as paid-up share capital, those assets are required to be distributed so that, as nearly as may be, the losses are borne by the Company’s shareholders in proportion to the capital paid-up or credited as paid-up at the commencement of the winding up on the shares in the Company held by them respectively. If in a winding-up the assets available for distribution among the Trinseo shareholders are more than sufficient to repay the whole of the share capital paid-up or credited as paid- up at the commencement of the winding-up, the excess is required to be distributed among the shareholders in proportion to the capital at the commencement of the winding-up paid- up or credited as paid-up on the said shares held by them respectively. The position described above is subject to any special terms and conditions applying to any class of shares.
Preemptive Rights.  Under Irish law, certain statutory preemption rights apply automatically in favor of shareholders where shares are to be issued for cash. As permitted by Irish law, Trinseo has opted to disapply these preemption rights in the Articles, such that the Board will be authorized to allot shares of any class in Trinseo with an aggregate par value amount up to the maximum of its authorized but unissued share capital as at the date of adoption of the Articles without approval from Trinseo’s shareholders for a period of five years from the date of adoption of the Articles.
Irish law requires this disapplication to be renewed at least every five years by 75% of the votes cast at a general meeting of shareholders, referred to under Irish law as a “special resolution”. If the disapplication is not renewed, new equity shares in Trinseo issued for cash must be offered to existing shareholders of Trinseo on a pro rata basis to their existing shareholdings before the shares may be issued to any new shareholders.
Statutory preemption rights do not apply (i) where shares are issued for non-cash consideration (such as in a share-for-share acquisition); (ii) to the issue of non-equity shares (that is, shares that have the right to participate only up to a specified amount in any income or capital distribution); or (iii) where shares are issued pursuant to an employee stock option or similar equity plan.
Share Repurchases, Redemptions and Conversions.  The Articles provide that Trinseo may purchase its own shares and redeem outstanding redeemable shares. Under Irish law, shares can only be purchased or redeemed out of: (i) distributable profits; or (ii) the proceeds of a new issue of shares made for the purpose 

of the purchase or redemption.  Under the Irish Companies Act, a company may purchase its own shares either (i) “on-market” on a recognized stock exchange, which includes the New York Stock Exchange (“NYSE”); or (ii) “off-market” (i.e., otherwise than on a recognized stock exchange). 
For Trinseo to make “on-market” purchases of its Ordinary Shares, shareholders must provide general authorization to the Company to do so by way of an ordinary resolution. For so long as a general authority is in force, no additional shareholder authority for a particular “on-market” purchase is required. Such authority can be given for a maximum period of five years before it is required to be renewed and must specify: (i) the maximum number of shares that may be purchased; and (ii) the maximum and minimum prices that may be paid for the shares by specifying particular sums or providing a formula. For an “off-market” purchase, the proposed purchase contract must be authorized by special resolution of the shareholders before the contract is entered into. 
Separately, Trinseo can redeem (as opposed to purchase) its redeemable shares once permitted to do so by its Articles (without the requirement for additional shareholder authority). The Articles provide that, unless the Board determines otherwise, any Ordinary Share that Trinseo has agreed to acquire shall be automatically converted into a redeemable share. Accordingly, for purposes of the Irish Companies Act, unless the Board determines otherwise, the acquisition of Ordinary Shares by Trinseo will technically be effected as a redemption of those Ordinary Shares. If the Articles did not contain such provision, acquisitions of Ordinary Shares by Trinseo would require to be effected as “on-market” or “off-market” purchases, as described above. Repurchased and redeemed shares may be cancelled or held as treasury shares, provided that the par value of treasury shares held by Trinseo at any time must not exceed 10% of the value of Trinseo’s company capital. 
Trinseo cannot exercise any rights in respect of any treasury shares. Treasury shares can either be held in treasury, re-issued “on-market” or “off-market” or cancelled. Depending on the circumstances of their acquisition, treasury shares may be held indefinitely or require to be cancelled after one or three years. The re-issue of treasury shares requires to be made pursuant to a valid and subsisting shareholder authority given by way of a special resolution. 
Purchases by Subsidiaries.  Under Irish law, a subsidiary of Trinseo may purchase its Ordinary Shares either “on-market” or “off market,” provided such purchases are authorized by shareholders as outlined above. The redemption option is not available to a subsidiary of Trinseo. The number of Ordinary Shares held by its subsidiaries at any time will count as treasury shares and will be included in any calculation of the 10% permitted treasury share threshold, as described above. While a subsidiary holds any of our shares, it cannot exercise voting rights in respect of those shares. The acquisition of our shares by a subsidiary must be funded out of distributable profits of the subsidiary.
Consolidation and Division; Subdivision. Under its Articles, the Company may by ordinary resolution consolidate and divide all or any of its share capital into shares of larger par value than its existing shares or subdivide its shares into smaller amounts than is fixed by its articles of association.
Reduction of Share Capital. The Company may, by ordinary resolution, reduce its authorized share capital in any way. The Company also may, by special resolution and subject to confirmation by the Irish High Court, reduce or cancel its issued share capital in any way.
Lien on Shares, Calls on Shares and Forfeiture of Shares.  The Articles provide that Trinseo will have a first and paramount lien on every share that is not a fully paid-up share for an amount equal to the unpaid portion of such share. Subject to the terms of their allotment, directors may call for any unpaid amounts in respect of any shares in Trinseo to be paid, and if payment is not made, the shares may be forfeited. 

General Meetings
General Meetings of Shareholders.  Trinseo must hold its annual general meeting no more than nine months after its accounting year end. In addition to any SEC mandated resolutions, the business of Trinseo’s annual general meeting is required to include: (a) the consideration of Trinseo’s statutory financial statements; (b) the review by shareholders of Trinseo’s affairs; (c) the election and reelection of directors in accordance with the Articles; (d) the appointment or reappointment of the Irish statutory auditors; (e) the authorization of the directors to approve the remuneration of the statutory auditors; and (f) the declaration of dividends (other than interim dividends).
The Articles provide that the Board may convene general meetings of shareholders at any place they so designate. All general meetings, other than annual general meetings, are referred to as ‘‘extraordinary general meetings’’ at law. If a general meeting is held outside Ireland, Trinseo has a duty, at its expense, to make all necessary arrangements to ensure that Trinseo’s shareholders can by technological means participate in any such meeting without leaving Ireland.
The Articles require that notice of an annual general meeting of shareholders must be delivered to the shareholders at least 21 clear days before the meeting. Shareholders must be notified of all general meetings (other than annual general meetings) at least 14 clear days prior to the meeting (provided that, in the case of an extraordinary general meeting for the passing of a special resolution, at least 21 clear days’ notice is required). ‘‘Clear days’’ means calendar days and excludes (1) the date on which a notice is given, or a request received; and (2) the date of the meeting itself. 
Calling Special Meetings of Shareholders.  The Articles provide that general meetings of shareholders may be called on the order of the Board. Under Irish law, one or more shareholders representing at least 10% of the paid-up share capital of Trinseo carrying voting rights have the right to requisition the holding of an extraordinary general meeting.
Serious Loss of Capital.  If the Board becomes aware that the Company’s assets are half or less of the amount of Trinseo’s called-up share capital, the directors must convene an extraordinary general meeting of shareholders no later than 28 days after the earliest day on which that fact is known to a director (and the general meeting must be convened for a date not later than 56 days from that day). The meeting must be convened for the purpose of considering whether any, and if so what, measures should be taken to address the situation.
Quorum for Meetings of Shareholders.  Under the Articles, holders of at least a simple majority of the shares issued and entitled to vote at a general meeting constitute a quorum. The necessary quorum at a separate general meeting of the holders of any class of shares is holders of at least a simple majority of that class of shares issued and entitled to vote.
Corporate Governance
Under Irish law and the Articles, the authority for the overall management of Trinseo is vested in the Board. The Board may delegate any of its powers on such terms as it thinks fit in accordance with the Articles and Irish law, although, the Board will remain responsible, as a matter of Irish law, for the proper management of the affairs of the Company. The directors must ensure that any delegation is and remains appropriate and that an adequate system of control and supervision is in place.
Size of Board and Vacancies.  The Articles provide that the number of directors will be as the Board may determine from time to time, at its discretion, but which shall not be less than three. The number of directors on the Board is thirteen. Directors are elected by ordinary resolution at general meetings, provided that, if 

there is a contested election (as provided for in the Articles), each of the nominees shall be voted upon as a separate resolution and the nominees who shall be elected as directors shall be only those nominees (in number equal to the number of available positions) who receive the highest number of votes of all nominees in favor of their election or re-election.
Under the Articles, any Director whose term expires at an annual general meeting shall be eligible to stand for re-election at the annual general meeting. Notwithstanding that a Director might not be re-elected at a general meeting, such Director shall nevertheless hold office until the conclusion of that meeting.
Under Irish law and the Articles, the Company’s shareholders have the power to remove a director without cause by simple majority resolution. At least 28 clear days’ notice of the resolution is given to the Company and the shareholder(s) comply with the relevant procedural requirements. Under Irish law, one or more shareholders representing at least 10% of the paid-up share capital of Trinseo carrying voting rights have the right to requisition the holding of an extraordinary general meeting at which such a resolution to remove a director (and appoint a replacement) may be proposed. 
The Articles provide that vacancies in the board of directors may be filled by the Board.
Transfer Agent and Registrar
Our transfer agent and registrar is Computershare Trust Company, N.A.
New York Stock Exchange Listing
The Ordinary Shares are listed on the New York Stock Exchange under the ticker symbol “TSE.”
Acquisitions
Shareholder Approval of Merger or Consolidation. Irish law recognizes the concept of a statutory merger in three situations: (1) a domestic merger where an Irish private limited company merges with another Irish company (not being a public limited company) under Part 9 of the Irish Companies Act; (2) a domestic merger where an Irish public limited company merges with another Irish company under Part 17 of the Irish Companies Act; and (3) a cross-border merger, where an Irish company merges with another company based in the European Economic Area (“EEA”) under the European Communities (Cross-border Merger) Regulations 2008 of Ireland.
Under Irish law and subject to applicable U.S. securities laws and the NYSE’s rules and regulations, where Trinseo proposes to acquire another company, approval of shareholders is not required, unless effected as a direct domestic merger or direct cross-border merger as referred to above.
Under Irish law, where another company proposes to acquire Trinseo PLC, the requirement for the approval of Trinseo PLC’s shareholders depends on the method of acquisition.
Schemes of Arrangement.  Under Irish law, schemes of arrangement are arrangements or compromises between a company and any class of shareholders or creditors, and are used in certain types of reconstructions, amalgamations, capital reorganizations or takeovers (similar to a merger in the United States). Such arrangements require the approval of: (i) a majority in number of shareholders or creditors (as the case may be) representing 75% in value of the creditors or each class of creditors or shareholders or each class of shareholders present and voting either in person or by proxy at a special meeting convened by order of the court; and (ii) the Irish High Court.

Once approved by the requisite shareholder and creditor majority, sanctioned by the Irish High Court and becoming effective, all shareholders and/or, as the case may be, creditors of the relevant class are bound by the terms of the scheme. Dissenting shareholders and/or, as the case may be, creditors have the right to appear at the Irish High Court hearing and make representations in objection to the scheme.
Takeover Offer.  The Irish Companies Act also provides that where (i) a takeover offer is made for shares, and (ii) following the offer, the offeror has acquired or contracted to acquire not less than 80% of the shares to which the offer relates, the offeror may require the other shareholders who did not accept the offer to transfer their shares on the terms of the offer.
A dissenting shareholder may object to the transfer on the basis that the offeror is not entitled to acquire its shares or to specify terms of acquisition different from those in the offer by applying to the court within 30 days of the date on which notice of the transfer was given. In the absence of fraud or oppression, and subject to strict compliance with the terms of the statute, the court is unlikely to order that the acquisition shall not take effect, but it may specify terms of the transfer that it finds appropriate.
A minority shareholder is also entitled in similar circumstances to require the offeror to acquire his or her shares on the terms of the offer.
Statutory Mergers.  It is also possible for Trinseo PLC to be acquired by way of a domestic or cross-border statutory merger, as described above. Such mergers must be approved by a special resolution of shareholders. If the consideration being paid to shareholders is not all in the form of cash, dissenting shareholders may be entitled, in certain circumstances, to require that their shares be acquired for cash.
Disclosure of Interests in Shares.  Under the Irish Companies Act, a person must notify us if, as a result of a transaction, the person will become interested in three percent or more of our voting shares, or if as a result of a transaction a person who was interested in three percent or more of our voting shares ceases to be so interested. Under the Irish Companies Act, an ‘‘interest’’ is broadly defined and includes direct and indirect holdings, beneficial interests and, in some cases, derivative interests. Furthermore, a person’s interests are aggregated with the interests of related persons and entities (including controlled companies). Where a person is interested in three percent or more of our voting shares, the person must notify us of any alteration of his or her interest that brings his or her total holding through the nearest whole percentage number, whether an increase or a reduction. The relevant percentage figure is calculated by reference to the aggregate nominal value of the voting shares in which the shareholder is interested as a proportion of the entire nominal value of our issued share capital (or any such class of share capital in issue). Where the percentage level of the person’s interest does not amount to a whole percentage, this figure is rounded down to the next whole number. We must be notified within five business days of the transaction or alteration of the shareholder’s interests that gave rise to the notification requirement. If a person fails to comply with these notification requirements, the person’s rights in respect of any of our shares it holds will not be enforceable, either directly or indirectly, by action or legal proceeding. However, such person may apply to the court to have the rights attaching to such shares reinstated. 
In addition, Irish law provides that a company may, by notice in writing, require a person whom the company knows or reasonably believes to be or to have been within the three preceding years, interested in its issued voting share capital to: (1) confirm whether this is or is not the case; and (2) if this is the case, to give further information that it requires relating to his or her interest and any other interest in the company’s shares of which he or she is aware.
The disclosure must be made within a reasonable period as specified in the relevant notice which may be as short as one or two days. If the recipient of the notice fails to respond within the reasonable time period specified in the notice, we may apply to the Irish High Court for an order directing that the affected shares 

be subject to certain restrictions, as prescribed by the Irish Companies Act, as follows: (1) any transfer of those shares or, in the case of unissued shares, any transfer of the right to be issued with shares and any issue of shares, shall be void; (2) no voting rights shall be exercisable in respect of those shares; (3) no further shares shall be issued in right of those shares or in pursuance of any offer made to the holder of those shares; and (4) no payment shall be made of any sums due from us on those shares, whether in respect of capital or otherwise. 
The court may also order that shares subject to any of these restrictions be sold with the restrictions terminating upon the completion of the sale.
In the event we are in an offer period pursuant to the Irish Takeover Rules, accelerated disclosure provisions apply for persons holding an interest in our securities of one percent or more.
Irish Takeover Rules
Trinseo is subject to the Irish Takeover Panel Act 1997, as amended, and the Irish Takeover Rules promulgated thereunder, or the Irish Takeover Rules, which regulate the conduct of takeovers of, and certain other relevant transactions affecting, Irish public limited companies listed on certain stock exchanges, including the NYSE. The Irish Takeover Rules are administered by the Irish Takeover Panel, which has supervisory jurisdiction over such transactions. Among other matters, the Irish Takeover Rules operate to ensure that no offer is frustrated or unfairly prejudiced and, in the case of multiple bidders, that there is a level playing field. For example, pursuant to the Irish Takeover Rules, the Trinseo Board will not be permitted, without approval from Trinseo’s shareholders, to take certain actions that might frustrate an offer for Trinseo once the Trinseo Board has received an approach that may lead to an offer or has reason to believe an offer is, or may be, imminent.
A transaction in which a third party seeks to acquire 30% or more of our voting rights and any other acquisitions of our securities will be governed by the Irish Takeover Panel Act 1997, as amended, and the Irish Takeover Rules and will be regulated by the Irish Takeover Panel. The “General Principles” of the Irish Takeover Rules and certain important aspects of the Irish Takeover Rules are described below.
General Principles.  The Irish Takeover Rules are built on the following General Principles which will apply to any transaction regulated by the Irish Takeover Panel: (1) in the event of an offer, all holders of securities of the target company must be afforded equivalent treatment and, if a person acquires control of a company, the other holders of securities must be protected; (2) the holders of securities in the target company must have sufficient time and information to enable them to reach a properly informed decision on the offer; where it advises the holders of securities, the board of directors of the target company must give its views on the effects of the implementation of the offer on employment, employment conditions and the locations of the target company's place of business; (3) a target company's board of directors must act in the interests of that company as a whole and must not deny the holders of securities the opportunity to decide on the merits of the offer; (4) false markets must not be created in the securities of the target company, the bidder or any other company concerned by the offer in such a way that the rise or fall of the prices of the securities becomes artificial and the normal functioning of the markets is distorted; (5) a bidder can only announce an offer after ensuring that he or she can fulfill in full the consideration offered, if such is offered, and after taking all reasonable measures to secure the implementation of any other type of consideration; (6) a target company may not be hindered in the conduct of its affairs longer than is reasonable by an offer for its securities; and (7) a “substantial acquisition” of securities, whether such acquisition is to be effected by one transaction or a series of transactions, shall take place only at an acceptable speed and shall be subject to adequate and timely disclosure.

Mandatory Bid.  Under certain circumstances, a person who acquires shares, or other voting securities, of a company may be required under the Irish Takeover Rules to make a mandatory cash offer for the remaining outstanding voting securities in that company at a price not less than the highest price paid for the securities by the acquirer, or any parties acting in concert with the acquirer, during the previous 12 months. This mandatory bid requirement is triggered if an acquisition of securities would increase the aggregate holding of an acquirer, including the holdings of any parties acting in concert with the acquirer, to securities representing 30% or more of the voting rights in a company, unless the Irish Takeover Panel otherwise consents. An acquisition of securities by a person holding, together with its concert parties, securities representing between 30% and 50% of the voting rights in a company would also trigger the mandatory bid requirement if, after giving effect to the acquisition, the percentage of the voting rights held by that person, together with its concert parties, would increase by 0.05% within a 12-month period. Any person, excluding any parties acting in concert with the holder, holding securities representing more than 50% of the voting rights of a company is not subject to these mandatory offer requirements in purchasing additional securities.
Voluntary Bid; Requirements to Make a Cash Offer and Minimum Price Requirements.  If a person makes a voluntary offer to acquire outstanding Trinseo PLC shares, the offer price must not be less than the highest price paid for Trinseo PLC shares by the bidder or its concert parties during the three-month period prior to the commencement of the offer period. The Irish Takeover Panel has the power to extend the "look back" period to 12 months if the Irish Takeover Panel, taking into account the General Principles, believes it is appropriate to do so.
If the bidder or any of its concert parties has acquired Trinseo PLC shares (1) during the 12-month period prior to the commencement of the offer period that represent more than 10% of the outstanding Trinseo PLC shares or (2) at any time after the commencement of the offer period, the offer must be in cash or accompanied by a full cash alternative and the price per Trinseo PLC share must not be less than the highest price paid by the bidder or its concert parties during, in the case of (1) above, the 12-month period prior to the commencement of the offer period or, in the case of (2) above, the offer period. The Irish Takeover Panel may apply this Rule to a bidder who, together with its concert parties, has acquired less than 10% of the total Trinseo PLC shares in the 12-month period prior to the commencement of the offer period if the Irish Takeover Panel, taking into account the General Principles, considers it just and proper to do so.
An offer period will generally commence from the date of the first announcement of the offer or proposed offer.
Substantial Acquisition Rules.  The Irish Takeover Rules also contain rules governing substantial acquisitions of shares and other voting securities which restrict the speed at which a person may increase his or her holding of shares and rights over shares to an aggregate of between 15% and 30% of the voting rights of the company. Except in certain circumstances, an acquisition or series of acquisitions of shares or rights over shares representing 10% or more of the voting rights of the company is prohibited, if such acquisition(s), when aggregated with shares or rights already held, would result in the acquirer holding 15% or more but less than 30% of the voting rights of the company and such acquisitions are made within a period of seven days. These rules also require accelerated disclosure of acquisitions of shares or rights over shares relating to such holdings.
Rights of Dissenting Shareholders.  Irish law does not generally provide for appraisal rights. However Irish law provides for dissenters' rights in certain situations, as described below: (1) under a takeover offer, an offeror which has acquired or contracted to acquire not less than 80% of the shares to which the offer relates may require the other shareholders who did not accept the offer to transfer their shares on the terms of the offer. Dissenting shareholders have the right to apply to the High Court of Ireland for relief; (2) a takeover scheme of arrangement which has been approved by the requisite shareholder majority and sanctioned by 

the High Court of Ireland will be binding on all shareholders. Dissenting shareholders have the right to appear at the High Court hearing and make representations in objection to the scheme; and (3) in the case of a domestic or cross-border statutory merger, if the consideration being paid to shareholders is not all in the form of cash, dissenting shareholders may, in certain circumstances, be entitled to require that their shares be acquired for cash.
Anti-Takeover Measures
Frustrating Action.  Under the Irish Takeover Rules, the Trinseo PLC Board is not permitted to take any action that might frustrate an offer for our shares once the Trinseo PLC Board has received an approach that may lead to an offer or has reason to believe that such an offer is or may be imminent, subject to certain exceptions. Potentially frustrating actions such as (1) the issue of shares, options, restricted share units or convertible securities; (2) material acquisitions or disposals; (3) entering into contracts other than in the ordinary course of business; or (4) any action, other than seeking alternative offers, which may result in frustration of an offer, are prohibited during the course of an offer or at any earlier time during which the Trinseo PLC Board has reason to believe an offer is or may be imminent. Exceptions to this prohibition are available where: (a) the action is approved by our shareholders at a general meeting; or (b) the Irish Takeover Panel has given its consent, where: (i) it is satisfied the action would not constitute frustrating action; (ii) our shareholders holding more than 50% of the voting rights state in writing that they approve the proposed action and would vote in favor of it at a general meeting; (iii) the action is taken in accordance with a contract entered into prior to the announcement of the offer, or any earlier time at which the Board considered the offer to be imminent; or (iv) the decision to take such action was made before the announcement of the offer and either has been at least partially implemented or is in the ordinary course of business.Exhibit 10.30
TRINSEO PLC
AMENDED AND RESTATED
2014 OMNIBUS INCENTIVE PLAN
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(As Assumed, Amended and Restated
as of October 8, 2021)
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WHEREAS:
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A.On May 30, 2014, Trinseo S.A., a public limited company (société anonyme) incorporated under the laws of Luxembourg adopted the Trinseo S.A. 2014 Omnibus Incentive Plan (as so adopted and amended, from time to time, in respect of periods prior to the Effective Time (as defined below), the “Original Plan”).
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B.On October 8, 2021, the re-domiciliation of Trinseo S.A. from Luxembourg to Ireland pursuant to a merger by acquisition under the European Communities (Cross-Border Mergers) Regulations 2008 of Ireland (SI 157/2008), as amended, and the Luxembourg law of 10 August 2015, as amended, was completed (the “Merger”). Pursuant to the Merger: (i) Trinseo PLC, a public limited company incorporated under the laws of Ireland, by operation of law and universal succession of title, became entitled to the assets of Trinseo S.A. and assumed the liabilities of Trinseo S.A. from the effective time of the Merger (the “Effective Time”); (ii) ordinary shares of $0.01 each (nominal value) were allotted and issued by the Trinseo PLC to the shareholders of Trinseo S.A. (other than Trinseo S.A. as holder of shares in itself), on a one-for-one basis, at the Effective Time as consideration for the transfer of the assets and liabilities of Trinseo S.A.; and (iii) Trinseo S.A. ceased to exist following completion of the Merger.
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C.In connection with the Merger, among other matters, at the Effective Time, the Original Plan and all awards then outstanding under the Original Plan were assumed by Trinseo PLC and the Original Plan was amended and restated on the terms set out herein and renamed the Trinseo PLC Amended And Restated 2014 Omnibus Incentive Plan (the Original Plan as so assumed, amended and restated at the Effective Time and as may, from time to time, be amended in respect of periods following the Effective Time, the “Plan”).
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D.Save as otherwise expressly provided herein, the Plan shall apply to all awards granted prior to or following the Effective Time.
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1.DEFINED TERMS
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Exhibit A, which is incorporated by reference, defines the terms used in the Plan and sets forth certain operational rules related to those terms.
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2.PURPOSE
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The Plan has been established to advance the interests of the Company by providing for the grant to Participants of Stock-based Awards.
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3.ADMINISTRATION
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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; determine the form of settlement of Awards (whether in cash, shares of Stock or other property); prescribe forms, rules and procedures relating to the Plan; and otherwise do all things necessary or appropriate to carry out the purposes of the Plan. Determinations of the Administrator made under the Plan will be conclusive and will bind all parties.
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4.LIMITS ON AWARDS UNDER THE PLAN
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(a)Number of Shares. The maximum number of shares of Stock that may be delivered in satisfaction of Awards under the Plan is 6,000,000 shares. Up to the total number of shares available for Awards to employee Participants may be issued in satisfaction of ISOs, but nothing in this Section 4(a) will be construed as requiring that any, or any fixed number of, ISOs be awarded under the Plan. The limits set forth in this Section 4(a) shall be construed to comply with Section 422 of the Code. For purposes of this Section 4(a), the shares of Stock withheld by the Company in payment of the exercise price or purchase price (including any nominal value payable in respect of an Award provided always that such nominal value must be paid by the Participant or some other person permitted to do so by Irish law as provided for in Section 6(a)(9)) of the Award, in satisfaction of tax withholding requirements with respect to the Award, or purchased by the Company using proceeds from Awards are prohibited from being returned back to the Plan’s share reserve for future issuance. The gross number of SAR awards granted under the Plan, as opposed to the net number of shares actually delivered under the SAR Award, will be deducted from the number of shares remaining available for issuance pursuant to the Awards granted under the Plan. For the avoidance of doubt, any shares of Stock underlying Awards settled in cash or that otherwise expire or become unexercisable without having been exercised or that are forfeited to or repurchased or redeemed by the Company due to the failure to vest may be returned to the Plan for future issuance. To the extent consistent with the requirements of Section 422 and the regulations thereunder, and with other applicable legal requirements (including applicable stock exchange requirements), Stock issued under awards of an acquired company that are converted, replaced or adjusted in connection with the acquisition shall not reduce the number of shares of Stock available for Awards under the Plan.
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(b)Type of Shares. Stock delivered by the Company under the Plan may be newly issued Stock or treasury Stock acquired by the Company. No fractional shares of Stock will be delivered under the Plan.
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(c)Individual Limits. The following additional limits will apply to Awards of the specified type granted, or in the case of Cash Awards, payable to any person in any calendar year:
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(1)Stock Options: 900,000 shares of Stock.
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(2)SARs: 900,000 shares of Stock.
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(3)Awards other than Stock Options, SARs or Cash Awards: 450,000 shares of Stock.
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(4)Cash Awards: $5,000,000.
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In applying the foregoing limits, (i) all Awards of the specified type granted to the same person in the same calendar year will be aggregated and made subject to one limit; (ii) the limits applicable to Stock Options and SARs refer to the number of shares of Stock subject to those Awards; (iii) the share limit under clause (3) refers to the maximum number of shares of Stock that may be delivered, or the value of which could be paid in cash or other property, under an Award or Awards of the type specified in clause (3) assuming a 

maximum payout; and (iv) the dollar limit under clause (4) refers to the maximum dollar amount payable under an Award or Awards of the type specified in clause (4) assuming a maximum payout. The foregoing provisions will be construed in a manner consistent with Section 162(m), including, without limitation, where applicable, the rules under Section 162(m) pertaining to permissible deferrals of exempt awards.
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5.ELIGIBILITY AND PARTICIPATION
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The Administrator will select Participants from among key Employees and Directors of, and consultants and advisors to, the Company and its Affiliates who are in a position to contribute significantly to the success of the Company and its Affiliates. Eligibility for ISOs is limited to individuals described in the first sentence of this Section 5 who are employees of the Company or of a “parent corporation” or “subsidiary corporation” of the Company as those terms are defined in Section 424 of the Code. Eligibility for Stock Options other than ISOs is limited to individuals described in the first sentence of this Section 5 who are providing direct services on the date of grant of the Stock Option to the Company or to a subsidiary of the Company that would be described in the first sentence of Treas. Regs. §1.409A-1(b)(5)(iii)(E).
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6.RULES APPLICABLE TO AWARDS
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(a)All Awards.
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(1)Award Provisions. The Administrator will determine the terms of all Awards, subject to the limitations provided herein. By accepting (or, under such rules as the Administrator may prescribe, being deemed to have accepted) an Award, the Participant will be deemed to have agreed to the terms of the Award and the Plan. Notwithstanding any provision of this Plan to the contrary, awards of an acquired company that are converted, replaced or adjusted in connection with the acquisition may contain terms and conditions that are inconsistent with the terms and conditions specified herein, as determined by the Administrator.
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(2)Term of Plan. No Awards may be made after ten years from the Date of Adoption, but previously granted Awards may continue beyond that date in accordance with their terms.
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(3)Transferability. Neither ISOs nor, except as the Administrator otherwise expressly provides in accordance with the third sentence of this Section 6(a)(3), other Awards may be transferred other than by will or by the laws of descent and distribution. During a Participant’s lifetime, ISOs (and, except as the Administrator otherwise expressly provides in accordance with the third sentence of this Section 6(a)(3), SARs and NSOs) may be exercised only by the Participant. The Administrator may permit the gratuitous transfer (i.e., transfer not for value) of Awards other than ISOs, subject to such limitations as the Administrator may impose.
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(4)Vesting, etc. The Administrator will determine the time or times at which an Award will vest or become exercisable and the terms on which a Stock Option or SAR will remain exercisable. Except in the event of the Participant’s death or disability or a five percent (5%) carve-out of the number of shares of Stock that may be delivered in satisfaction of Awards under the Plan (as defined in Section 4(a)), all Awards will only vest or become exercisable after a minimum of twelve months from the grant date. Without limiting the foregoing, the Administrator may at any time accelerate the vesting or exercisability of an Award, regardless of any adverse or potentially adverse tax or other consequences resulting from such acceleration. Unless the Administrator expressly provides otherwise, however, the following rules will apply if a Participant’s Employment ceases:
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(A)Immediately upon the cessation of the Participant’s Employment and except as provided in (B) and (C) below, each Stock Option and SAR that is then held by the Participant or by the Participant’s 

permitted transferees, if any, will cease to be exercisable and will terminate and all other Awards that are then held by the Participant or by the Participant’s permitted transferees, if any, to the extent not already vested will be forfeited.
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(B)Subject to (C) and (D) below, all Stock Options and SARs held by the Participant or the Participant’s permitted transferees, if any, immediately prior to the cessation of the Participant’s Employment, 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)(4), and will thereupon immediately terminate.
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(C)All Stock Options and SARs held by a Participant or the Participant’s permitted transferees, if any, immediately prior to the cessation of the Participant’s Employment due to his or her death or by the Company due to his or her Permanent Disability, to the extent then exercisable, will remain exercisable for the lesser of (i) a period of twelve (12) 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)(4), and will thereupon immediately terminate.
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(D)All Stock Options and SARs (whether or not exercisable) held by a Participant or the Participant’s permitted transferees, if any, immediately prior to the cessation of the Participant’s Employment will immediately terminate upon such cessation of Employment if the termination is for Cause or occurs in circumstances that in the sole determination of the Administrator would have constituted grounds for the Participant’s Employment to be terminated for Cause.
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(5)Additional Restrictions. The Administrator may cancel, rescind, withhold or otherwise limit or restrict any Award at any time if the Participant is not in compliance with all applicable provisions of the Award agreement and the Plan, or if the Participant breaches any agreement with the Company or its Affiliates with respect to non-competition, non-solicitation or confidentiality. Without limiting the generality of the foregoing, the Administrator may recover Awards made under the Plan and payments under or gain in respect of any Award in accordance with any applicable Company clawback or recoupment policy, as such policy may be amended and in effect from time to time, or as otherwise required by applicable law or applicable stock exchange listing standards, including, without limitation, Section 10D of the Securities Exchange Act of 1934, as amended.
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(6)Taxes. The Company or any Affiliate shall have the authority and right to deduct or withhold or require a Participant to remit to the Company or any Affiliate, an amount sufficient to satisfy Tax-Related Items with respect to any taxable event concerning a Participant arising as a result of the Plan or to take such other action as may be necessary in the opinion of the Company or any Affiliate, as appropriate, to satisfy withholding obligations for the payment of Tax-Related Items, including but not limited to (i) withholding from the Participant’s wages or other cash compensation; (ii) withholding from the proceeds for the sale of shares of Stock underlying the Award either through a voluntary sale or a mandatory sale arranged by the Company on the Participant’s behalf; or (iii) in the Administrator’s sole discretion and in satisfaction of the foregoing requirement withhold shares of Stock otherwise issuable under an Award (or allow the return of shares of Stock ) having a fair market value equal to the sums required to be withheld. To avoid negative accounting treatment, the number of Shares which may be withheld with respect to the issuance, vesting, exercise or payment of any Award or which may be repurchased from the Participant of such Award in order to satisfy the Participant's Tax-Related Items liabilities with respect to the issuance, vesting, exercise or payment of the Award may be limited to the number of shares of Stock which have a fair market value on the date of withholding or repurchase equal to the aggregate amount of such liabilities based on the maximum applicable withholding rates. No Stock shall be delivered hereunder to any Participant or other person until the Participant or such other person has made arrangements acceptable to the Company for the satisfaction of the Tax-Related Items withholdings obligations with respect to any 

taxable event concerning the Participant or such other person arising as a result of the Plan in a manner consistent with Irish law.
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(7)Dividend Equivalents, Etc. The Administrator may provide for the payment of amounts (on terms and subject to conditions established by the Administrator) in lieu of cash dividends or other cash distributions with respect to Stock subject to an Award whether or not the holder of such Award is otherwise entitled to share in the actual dividend or distribution in respect of such Award, except for Awards of Stock Options or SARs, for which such payments shall be prohibited. Any entitlement to dividend equivalents or similar entitlements will be established and administered either consistent with an exemption from, or in compliance with, the requirements of Section 409A. Dividends or dividend equivalent amounts payable in respect of Awards shall be subject to the identical time-based vesting and performance conditions as the underlying Award and cannot be paid unless and until all vesting and performance conditions of the underlying Award are met. Dividends or dividend equivalent amounts payable in respect of Awards that are subject to restrictions may be subject to such additional limits or restrictions as the Administrator may impose, consistent with the requirements of the Articles.
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(8)Rights Limited. Nothing in the Plan will be construed as giving any person the right to continued employment or service with the Company or its Affiliates, or any rights as a stockholder 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 a termination of Employment for any reason, even if the termination is in violation of an obligation of the Company or any Affiliate to the Participant.
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(9)Purchase Price. At the time of the Award, the Administrator shall determine the price, if any, to be paid by the Participant for each share of Stock  subject to the Award.  The price to be paid by the Participant shall not be less than the nominal value of a share of Stock (or such higher amount required by applicable Irish law).  The purchase price of shares  of Stock acquired pursuant to the Award shall be paid or redeemed by a non-Irish incorporated Subsidiary on behalf of the Participant as designated by the Administrator or by the Participant through one or more of the following methods (a) in cash or(b) in any other form of legal consideration that may be acceptable to the Administrator in its discretion and in compliance with applicable Irish law.
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(10)Coordination with Other Plans. Awards under the Plan may be granted in tandem with, or in satisfaction of or substitution for, other Awards under the Plan or awards made under other compensatory plans or programs of the Company or its Affiliates. For example, but without limiting the generality of the foregoing, awards under other compensatory plans or programs of the Company or its Affiliates may be settled in Stock (including, without limitation, Unrestricted Stock) if the Administrator so determines, in which case the shares delivered will be treated as awarded under the Plan (and will reduce the number of shares thereafter available under the Plan in accordance with the rules set forth in Section 4). In any case where an award is made under another plan or program of the Company or its Affiliates and such award is intended to qualify for the performance-based compensation exception under Section 162(m), and such award is settled by the delivery of Stock or another Award under the Plan, the applicable Section 162(m) limitations under both the other plan or program and under the Plan will be applied to the Plan as necessary (as determined by the Administrator) to preserve the availability of the Section 162(m) performance-based compensation exception with respect thereto.
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(11)Section 162(m). In the case of any Performance Award (other than a Stock Option or SAR) intended to qualify for the performance-based compensation exception under Section 162(m), the Administrator will establish the applicable Performance Criterion or Criteria in writing no later than ninety (90) days after the commencement of the period of service to which the performance relates (or at such earlier time as is required to qualify the Award as performance-based under Section 162(m)) and, prior to the event or occurrence (grant, vesting or payment, as the case may be) that is conditioned on the attainment 

of such Performance Criterion or Criteria, will certify whether it or they have been attained. The preceding sentence will not apply to an Award eligible (as determined by the Administrator) for exemption from the limitations of Section 162(m) by reason of the post-initial public offering transition relief in Section 1.162-27(f) of the Treasury Regulations.
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(12)Section 409A. Each Award will contain such terms as the Administrator determines, and will be construed and administered, such that the Award either qualifies for an exemption from the requirements of Section 409A or satisfies such requirements.
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(13)Fair Market Value. In determining the fair market value of any share of Stock under the Plan, the Administrator will make the determination in good faith, and consistent with the rules of Section 422 and Section 409A when applicable.
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(b)Stock Options and SARs.
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(1)Time And Manner Of Exercise. Unless the Administrator expressly provides otherwise, no Stock Option or SAR will be deemed to have been exercised until the Administrator receives a notice of exercise (in form acceptable to the Administrator), which may be an electronic notice, signed (including electronic signature in form acceptable to the Administrator) by the appropriate person and accompanied by any payment required under the Award. A Stock Option or SAR exercised by any person other than the Participant will not be deemed to have been exercised until the Administrator has received such evidence as it may require that the person exercising the Award has the right to do so. The Administrator may impose conditions on the exercisability of Awards, including limitations on the time periods during which Awards may be exercised or settled.
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(2)Exercise Price. The exercise price (or the base value from which appreciation is to be measured) of each Award requiring exercise will be no less than the higher of (a) the nominal value of the Stock subject to the Award and (b) 100% (or in the case of an ISO granted to a ten-percent shareholder within the meaning of subsection (b)(6) of Section 422, 110%) of the fair market value of the Stock subject to the Award, determined as of the date of grant, or such higher amount as the Administrator may determine in connection with the grant. Except in connection with a corporate transaction involving the Company (which term shall include, without limitation, any stock dividend, stock split, extraordinary cash dividend, recapitalization, reorganization, merger, consolidation, split-up, spin-off, combination, or exchange of shares) or as otherwise contemplated by Section 7 of the Plan, the terms of outstanding Stock Options or SARs, or any substitution of such Awards under Section 6(a)(10), as applicable, may not be amended to reduce the exercise prices of such Stock Options or the base values from which appreciation under such SARs are to be measured other than in accordance with the stockholder approval requirements of the New York Stock Exchange. Unless otherwise submitted to and approved by the Company’s shareholders, any substitution or buyout of Stock Options or SARs for cash, as applicable, shall be prohibited when the exercise price for such Stock Option is below the current fair market value or when the base value from which appreciation under such SARs are to be measured is below the current fair market value.
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(3)Payment Of Exercise Price. Where the exercise of an Award is to be accompanied by payment, payment of the exercise price will be by cash or check acceptable to the Administrator or by such other legally permissible means, if any, as may be acceptable to the Administrator.
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(4)Maximum Term. Stock Options and SARs will have a maximum term not to exceed ten (10) years from the date of grant (or five (5) years from the date of grant in the case of an ISO granted to a ten-percent shareholder described in Section 6(b)(2) above); provided, however, that, if a Participant still holding an outstanding but unexercised NSO or SAR ten (10) years from the date of grant (or, in the case of an NSO or SAR with a maximum term of less than ten (10) years, such maximum term) is prohibited by 

applicable law or a written policy of the Company applicable to similarly situated employees from engaging in any open-market sales of Stock, and if at such time the Stock is publicly traded (as determined by the Administrator), the maximum term of such Award will instead be deemed to expire on the thirtieth (30th) day following the date the Participant is no longer prohibited from engaging in such open market sales.
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7.EFFECT OF CERTAIN TRANSACTIONS
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(a)Mergers, etc. Except as otherwise provided in an Award agreement, the following provisions will apply in the event of a Covered Transaction:
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(1)Assumption or Substitution. If the Covered Transaction is one in which there is an acquiring or surviving entity, the Administrator may (but, for the avoidance of doubt, need not) provide (i) for the assumption or continuation of some or all outstanding Awards or any portion thereof or (ii) for the grant of new awards in substitution therefor by the acquiror or survivor or an affiliate of the acquiror or survivor.
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(2)Cash-Out of Awards. Subject to Section 7(a)(5) below the Administrator may (but, for the avoidance of doubt, need not) provide for payment (a “cash-out”), with respect to some or all Awards or any portion thereof, equal in the case of each affected Award or portion thereof to the excess, if any, of (A) the fair market value of one share of Stock (as determined by the Administrator in its reasonable discretion) times the number of shares of Stock subject to the Award or such portion, over (B) the aggregate exercise or purchase price, if any, under the Award or such portion (in the case of an SAR, the aggregate base value above which appreciation is measured), in each case on such payment terms (which need not be the same as the terms of payment to holders of Stock) and other terms, and subject to such conditions, as the Administrator determines; it being understood that if the exercise or purchase price (or base value) of an Award is equal to or greater than the fair market value of one share of Stock, the Award may be cancelled with no payment due hereunder.
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(3)Acceleration of Certain Awards. Subject to Section 7(a)(5) below, the Administrator may (but, for the avoidance of doubt, need not) provide that any Award requiring exercise will become exercisable, in full or in part and/or that the delivery of any shares of Stock remaining deliverable under any outstanding Award of Stock Units (including Restricted Stock Units and Performance Awards to the extent consisting of Stock Units) will be accelerated in full or in part, in each case on a basis that gives the holder of the Award a reasonable opportunity, as determined by the Administrator, following exercise of the Award or the delivery of the shares, as the case may be, to participate as a stockholder in the Covered Transaction.
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(4)Termination of Awards Upon Consummation of Covered Transaction. Except as the Administrator may otherwise determine in any case, each Award will automatically terminate (and in the case of outstanding shares of Restricted Stock, will automatically be forfeited) upon consummation of the Covered Transaction, other than Awards assumed pursuant to Section 7(a)(1) above.
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(5)Additional Limitations. Any share of Stock and any cash or other property delivered pursuant to Section 7(a)(2) or Section 7(a)(3) above with respect to an Award may, in the discretion of the Administrator, contain such restrictions, if any, as the Administrator deems appropriate to reflect any performance or other vesting conditions to which the Award was subject and that did not lapse (and were not satisfied) in connection with the Covered Transaction. For purposes of the immediately preceding sentence, a cash-out under Section 7(a)(2) above or acceleration under Section 7(a)(3) above will not, in and of itself, be treated as the lapsing (or satisfaction) of a performance or other vesting condition. In the case of Restricted Stock that does not vest and is not forfeited in connection with the Covered Transaction, the Administrator may require that any amounts delivered, exchanged or otherwise paid in respect of such Stock in connection with the Covered Transaction be placed in escrow or otherwise made subject to such restrictions as the Administrator deems appropriate to carry out the intent of the Plan.

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(b)Changes in and Distributions With Respect to Stock.
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(1)Basic Adjustment Provisions. In the event of a stock dividend, stock split or combination of shares (including a reverse stock split), recapitalization or other change in the Company’s capital structure that constitutes an equity restructuring within the meaning of FASB ASC 718, the Administrator will make appropriate adjustments to the maximum number of shares of Stock that may be delivered under the Plan, to the maximum number of shares of Stock that may be delivered in satisfaction of ISOs under the Plan, and to the maximum share limits described in Section 4(c) 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 or purchase prices (or base values) relating to Awards and any other provision of Awards affected by such change.
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(2)Certain Other Adjustments. The Administrator may also make adjustments of the type described in Section 7(b)(1) above to take into account distributions to 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, having due regard for the qualification of ISOs under Section 422,  the requirements of Section 409A , and for the performance-based compensation rules of Section 162(m)  where applicable.
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(3)Continuing Application of Plan Terms. References in the Plan to shares of Stock will be construed to include any stock or securities resulting from an adjustment pursuant to this Section 7.
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8.LEGAL CONDITIONS ON DELIVERY OF STOCK
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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: (i) the Company is satisfied that all legal matters in connection with the issuance and delivery of such shares have been addressed and resolved; (ii) 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 (iii) all conditions of the Award have been satisfied or waived. 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 the Securities Act of 1933, as amended, or any applicable state or non-U.S. securities law. Any Stock required to be issued to Participants under the Plan will be evidenced in such manner as the Administrator may deem appropriate, including book-entry registration or delivery of stock certificates. In the event that the Administrator determines that Stock certificates will be issued to Participants under the Plan, the Administrator may require that certificates evidencing Stock issued under the Plan bear an appropriate legend reflecting any restriction on transfer applicable to such Stock, and the Company may hold the certificates pending lapse of the applicable restrictions.
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9.AMENDMENT AND TERMINATION
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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, and may at any time terminate the Plan as to any future grants of Awards; provided, that, except as otherwise expressly provided in the Plan, the Administrator may not, without the Participant’s consent, alter the terms of an Award so as to affect materially and adversely the Participant’s rights under the Award, unless the Administrator expressly reserved the right to do so at the time the Award was granted. Any amendments to the Plan will be conditioned upon stockholder approval only to the extent, if any, such approval is required by law (including the Code and applicable stock exchange requirements), as determined by the Administrator.

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10.OTHER COMPENSATION ARRANGEMENTS
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The existence of the Plan or the grant of any Award will not in any way affect the Company’s right to award a person bonuses or other compensation in addition to Awards under the Plan.
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11.MISCELLANEOUS
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(a)Waiver of Jury Trial. By accepting an Award under the Plan, each Participant waives any right to a trial by jury in any action, proceeding or counterclaim concerning any rights under the Plan and any Award, or under any amendment, waiver, consent, instrument, document or other agreement delivered or which in the future may be delivered in connection therewith, and agrees that any such action, proceedings or counterclaim will be tried before a court and not before a jury. By accepting an Award under the Plan, each Participant certifies that no officer, representative, or attorney of the Company has represented, expressly or otherwise, that the Company would not, in the event of any action, proceeding or counterclaim, seek to enforce the foregoing waivers. Notwithstanding anything to the contrary in the Plan, nothing herein is to be construed as limiting the ability of the Company and a Participant to agree to submit disputes arising under the terms of the Plan or any Award made hereunder to binding arbitration or as limiting the ability of the Company to require any eligible individual to agree to submit such disputes to binding arbitration as a condition of receiving an Award hereunder.
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(b)Limitation of Liability. Notwithstanding anything to the contrary in the Plan, neither the Company, nor any Affiliate, nor the Administrator, nor any person acting on behalf of the Company, any Affiliate, or the Administrator, will be liable to any Participant or to the estate or beneficiary of any Participant or to any other holder of an Award by reason of any acceleration of income, or any additional tax (including any interest and penalties), asserted by reason of the failure of an Award to satisfy the requirements of Section 422 or Section 409A or by reason of Section 4999 of the Code, or otherwise asserted with respect to the Award.
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12.MISCELLANEOUS ESTABLISHMENT OF SUB-PLANS
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The Administrator may from time to time establish one or more sub-plans under the Plan for purposes of satisfying applicable securities, or other regulatory or tax laws of various jurisdictions. The Administrator will establish such sub-plans by adopting supplements to the Plan setting forth (i) such limitations on the Administrator’s discretion under the Plan as it deems necessary or desirable and (ii) such additional terms and conditions not otherwise inconsistent with the Plan as it deems necessary or desirable. All supplements so established will be deemed to be part of the Plan, but each supplement will apply only to Participants within the affected jurisdiction (as determined by the Administrator).
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13.GOVERNING LAW
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(a)Certain Requirements of Corporate Law. Awards will be granted and administered consistent with the requirements of applicable law of Ireland relating to the issuance of stock and the consideration to be received therefor, and with the applicable requirements of the stock exchanges or other trading systems on which the Stock is listed or entered for trading, in each case as determined by the Administrator.
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(b)Other Matters. Except as otherwise provided by the express terms of an Award agreement, under a sub-plan described in Section 12 or as provided in Section 13(a) above, the provisions of the Plan and of Awards under the Plan and all claims or disputes arising out of or based upon the Plan or any Award under the Plan or relating to the subject matter hereof or thereof will be governed by and construed in accordance with the domestic substantive laws of the State of Pennsylvania without giving effect to any choice or 

conflict of laws provision or rule that would cause the application of the domestic substantive laws of any other jurisdiction.
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(c)Jurisdiction. By accepting an Award, each Participant will be deemed to (a) have submitted irrevocably and unconditionally to the jurisdiction of the federal and state courts located within the geographic boundaries of the United States District Court for the District of Pennsylvania for the purpose of any suit, action or other proceeding arising out of or based upon the Plan or any Award; (b) agree not to commence any suit, action or other proceeding arising out of or based upon the Plan or an Award, except in the federal and state courts located within the geographic boundaries of the United States District Court for the District of Pennsylvania; and (c) waive, and agree not to assert, by way of motion as a defense or otherwise, in any such suit, action or proceeding, any claim that it is not subject personally to the jurisdiction of the above-named courts that its property is exempt or immune from attachment or execution, that the suit, action or proceeding is brought in an inconvenient forum, that the venue of the suit, action or proceeding is improper or that the Plan or an Award or the subject matter thereof may not be enforced in or by such court.
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EXHIBIT A
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Definition of Terms
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The following terms, when used in the Plan, will have the meanings and be subject to the provisions set forth below:
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“Administrator”: The Compensation Committee, except that the Compensation Committee may delegate (i) to one or more of its members (or one or more other members of the Board (including the full Board)) such of its duties, powers and responsibilities as it may determine; (ii) to one or more officers of the Company the power to grant Awards to the extent permitted by applicable law; and (iii) to such Employees or other persons as it determines such ministerial tasks as it deems appropriate. In the event of any delegation described in the preceding sentence, the term “Administrator” will include the person or persons so delegated to the extent of such delegation.
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“Affiliate”: Any corporation or other entity that stands in a relationship to the Company that would result in the Company and such corporation or other entity being treated as one employer under Section 414(b) and Section 414(c) of the Code, provided that, for purposes of determining treatment as a single employer under Section 414(b) and Section 414(c) of the Code, “50%” shall replace “80%” in the applicable stock ownership requirements under such sections of the Code and the regulations thereunder.
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“Articles”: The articles of association of the Company.
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“Award”: Any or a combination of the following:
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(i)Stock Options.
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(ii)SARs.
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(iii)Restricted Stock.
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(iv)Unrestricted Stock.
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(v)Stock Units, including Restricted Stock Units.
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(vi)Performance Awards.
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(vii)Cash Awards.
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(viii)Awards (other than Awards described in (i) through (vii) above) that are convertible into or otherwise based on Stock.
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“Board”: The Board of Directors of the Company.
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“Cash Award”: An Award denominated in cash.
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“Cause”: In the case of any Participant who is party to an employment or severance-benefit agreement that contains a definition of “Cause,” the definition set forth in such agreement will apply with respect to such Participant under the Plan for so long as such agreement is in effect. In the case of any other Participant, 

“Cause” will mean, as determined by the Administrator in its reasonable judgment, (i) a substantial failure of the Participant to perform the Participant’s duties and responsibilities to the Company or subsidiaries or substantial negligence in the performance of such duties and responsibilities; (ii) the commission by the Participant of a felony or a crime involving moral turpitude; (iii) the commission by the Participant of theft, fraud, embezzlement, material breach of trust or any material act of dishonesty involving the Company or any of its subsidiaries; (iv) a significant violation by the Participant of the code of conduct of the Company or its subsidiaries or of any material policy of the Company or its subsidiaries, or of any statutory or common law duty of loyalty to the Company or its subsidiaries; (v) material breach of any of the terms of the Plan or any Award made under the Plan, or of the terms of any other agreement between the Company or subsidiaries and the Participant; or (vi) other conduct by the Participant that could reasonably be expected to be harmful to the business, interests or reputation of the Company.
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“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.
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“Compensation Committee”: The Compensation Committee of the Board.
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“Company”: Trinseo PLC, a company incorporated in Ireland or, where the context requires,
with respect to periods prior to the Effective Time, Trinseo S.A.
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“Covered Transaction”: Any of (i) a consolidation, merger, or similar transaction or series of related transactions, including a sale or other disposition of stock, in which the Company is not the surviving corporation or that results in the acquisition of all or substantially all of the Company’s then outstanding ordinary shares 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. Where a Covered Transaction involves a tender offer that is reasonably expected to be followed by a merger described in clause (i) (as determined by the Administrator), the Covered Transaction will be deemed to have occurred upon consummation of the tender offer.
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“Date of Adoption”: The earlier of the dates (both prior to the Effective Time) that the Plan was approved by the Company’s shareholders or adopted by the Board, as determined by the Compensation Committee.
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“Director”: A member of the Board.
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“Employee”: Any person who is employed by the Company or an Affiliate.
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“Employment”: A Participant’s employment or other service relationship with the Company and its Affiliates. Employment will be deemed to continue, unless the Administrator expressly provides otherwise, so long as the Participant is employed by, or otherwise is providing services in a capacity described in Section 5 to the Company or an Affiliate. If a Participant’s employment or other service relationship is with an Affiliate and that entity ceases to be an Affiliate, the Participant’s Employment will be deemed to have terminated when the entity ceases to be an Affiliate unless the Participant transfers Employment to the Company or its remaining Affiliates. Notwithstanding the foregoing and the definition of “Affiliate” above, in construing the provisions of any Award relating to the payment of “nonqualified deferred compensation” (subject to Section 409A) upon a termination or cessation of Employment, references to termination or cessation of employment, separation from service, retirement or similar or correlative terms will be construed to require a “separation from service” (as that term is defined in Section 1.409A- 1(h) of the U.S. 

Treasury Regulations, after giving effect to the presumptions contained therein) from the Company and from all other corporations and trades or businesses, if any, that would be treated as a single “service recipient” with the Company under Section 1.409A-1(h)(3) of the U.S. Treasury Regulations. The Company may, but need not, elect in writing, subject to the applicable limitations under Section 409A, any of the special elective rules prescribed in Section 1.409A- 1(h) of the U.S. Treasury Regulations for purposes of determining whether a “separation from service” has occurred.  Any such written election will be deemed a part of the Plan.
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“ISO”: A Stock Option intended to be an “incentive stock option” within the meaning of Section 422. Each Stock Option granted pursuant to the Plan will be treated as providing by its terms that it is to be an NSO unless, as of the date of grant, it is expressly designated as an ISO.
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“NSO”: A Stock Option that is not intended to be an “incentive stock option” within the meaning of Section 422.
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“Participant”: A person who is granted an Award under the Plan.
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“Performance Award”: An Award subject to Performance Criteria. The Administrator 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.
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“Performance Criteria”: Specified criteria, other than the mere continuation of Employment or the mere passage of time, the satisfaction of which is a condition for the grant, exercisability, vesting or full enjoyment of an Award. For purposes of Awards that are intended to qualify for the performance-based compensation exception under Section 162(m), a Performance Criterion will mean an objectively determinable measure or measures of performance relating to any or any combination of the following (measured either absolutely or by reference to an index or indices and determined either on a consolidated basis or, as the context permits, on a divisional, subsidiary, line of business, project or geographical basis or in combinations thereof): sales; revenues; assets; expenses; earnings before or after deduction for all or any portion of interest, taxes, depreciation, amortization or equity expense, whether or not on a continuing operations or an aggregate or per share basis; return on equity, investment, capital, capital employed or assets; one or more operating ratios; operating income or profit, including on an after-tax basis; net income; borrowing levels, leverage ratios or credit rating; market share; capital expenditures; cash flow; stock price; stockholder return; sales of particular products or services; customer acquisition or retention; acquisitions and divestitures (in whole or in part); joint ventures, strategic alliances, licenses or collaborations; spin-offs, split-ups and the like; reorganizations; recapitalizations, restructurings, financings (issuance of debt or equity) or refinancings; manufacturing or process development; or environmental health and/or safety metrics. A Performance Criterion and any targets with respect thereto determined by the Administrator need not be based upon an increase, a positive or improved result or avoidance of loss. To the extent consistent with the requirements for satisfying the performance-based compensation exception under Section 162(m), the Administrator may provide, by the deadline that otherwise applies to the establishment of the terms of any Award intended to qualify for such exception, that one or more of the Performance Criteria applicable to such Award will be adjusted in an objectively determinable manner to reflect events (for example, the impact of charges for restructurings, discontinued operations, mergers, acquisitions, extraordinary items, and other unusual or non- recurring items, and the cumulative effects of tax or accounting changes, each as defined by U.S. or international generally accepted accounting principles) occurring during the performance period that affect the applicable Performance Criterion or Criteria.
​
“Permanent Disability”: In the case of any Participant who is party to an employment or severance-benefit agreement that contains a definition of “Permanent Disability” (or similar term), the definition set forth in 

such agreement will apply with respect to such Participant under the Plan for so long as such agreement is in effect. In the case of any other Participant, “Permanent Disability” shall mean a disability that would entitle a Participant to long-term disability benefits under the Company’s long-term disability plan to which the Participant participates. Notwithstanding the foregoing, however, in the case of any Award that is subject to Section 409A and is payable upon a Participant’s Permanent Disability, the Participant shall be treated as having a Permanent Disability only if the Participant’s condition also satisfies the definition of “disability” in Treasury Regulation 1.409A-3(i)(4).
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“Restricted Stock”: Stock subject to restrictions requiring that it be redelivered or offered for sale to the Company if specified conditions are not satisfied.
​
“Restricted Stock Unit”: A Stock Unit that is, or as to which the delivery of Stock or cash in lieu of Stock is, subject to the satisfaction of specified performance or other vesting conditions.
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“SAR”: A right entitling the holder upon exercise to receive an amount (payable in cash or in shares of Stock of equivalent value) equal to the excess of the fair market value of the shares of Stock subject to the right over the base value from which appreciation under the SAR is to be measured.
​
“Section 162(m)”: Section 162(m) of the Code.
​
“Section 409A”: Section 409A of the Code. 
​
“Section 422”: Section 422 of the Code. 
​
“Stock”: Ordinary shares of the Company, nominal value $0.01 per share and “stockholder” shall be interpreted accordingly where referring to holders of Stock in the Company.
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“Stock Option”: An option entitling the holder to acquire shares of Stock upon payment of the exercise price.
​
“Stock Unit”: An unfunded and unsecured promise, denominated in shares of Stock, to deliver Stock or cash measured by the value of Stock in the future.
​
 “Tax-Related Items” means (i) federal, state, and local taxes and taxes imposed by any jurisdiction (including but not limited to, income tax, social security or insurance contributions, payroll tax, fringe benefits tax, payment on account, employment tax obligations, stamp taxes, and any other taxes that may be due) required by law to be withheld and (ii) any employer tax liability shifted to a Participant. 
​
“Unrestricted Stock”: Stock not subject to any restrictions under the terms of the Award.

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