Document:

Advisory Agreement, dated June 17, 2010

 Exhibit 10.10 
 ADVISORY AGREEMENT 
 This Advisory Agreement (this
“Agreement”) is made and entered into as of 17 June 2010 by and amongst Bain Capital Partners, LLC, a Delaware limited liability company, and Portfolio Company Advisors Limited, an English private limited company (together, the
“Advisors”) on the one hand and Styron Holding BV, a Dutch besloten vennootschap met beperkte aansprakelijkheid and Bain Capital Everest US Holding Inc., a Delaware corporation (each a “Company” and together,
the “Companies”) on the other hand. 
 WHERAS, the Companies desire to retain the Advisors, and the Advisors
desire to be retained, to provide the services described herein to the Companies and their respective Subsidiaries and Affiliates (each Subsidiary and Affiliate, a “Beneficiary Affiliate” and, together, the “Beneficiary
Affiliates”); 
 WHEREAS, the parties desire to establish a framework agreement to outline the terms of their overall
relationship; 
 WHEREAS, for business planning and budgeting purposes, the parties desire to establish a firm basis for the
fees to be paid for such services over the term of this Agreement, and to establish a procedure for determining subsequent fees on the basis of fixed amounts covering annual extensions of this Agreement; 

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties to this Agreement hereby agree as follows: 

1. Term. This Agreement shall be in effect for an initial term commencing on the date of this Agreement and ending
on the tenth (10th) anniversary thereof (the “Term”), which initial term shall be automatically extended thereafter on a year-to-year basis unless the Advisors provide written notice to the Companies or the Companies provide
written notice to the Advisors of its/their desire to terminate this Agreement at least ninety (90) days prior to the expiration of the Term or any extension thereof. Notwithstanding anything to the contrary in this Agreement, this Agreement
may be terminated prior to the tenth (10th) anniversary of the date of this Agreement upon (i) a willful material breach of this Agreement by a party which is not cured within thirty (30) days of receipt of a written notice from a
non-breaching party requiring cure, (ii) the earlier of (A) consummation of a Change of Control, or (B) an Initial Public Offering (and in each case this Agreement shall terminate automatically without further act of the parties),
(iii) written consent of the parties, or (iv) the Advisors otherwise serving a written termination notice on the Companies. The provisions of Sections 1, 3(c) and 6 to 20 (inclusive) shall survive any
termination of this Agreement. 
 2. Advisory Services. The Advisors shall perform or cause to be
performed certain advisory services, as further described below (collectively, the “Advisory Services”), for the benefit of the Companies and the Beneficiary Affiliates. The Advisory Services may include, without limitation, support
and advice in connection with the following and services of the following categories: 

 (a) general executive services; 

(b) development of any business; 
 (c) finance-related services, including assistance in the preparation of financial projections; 
 (d) marketing, including monitoring of ongoing marketing plans and strategies; 
 (e) operations and project management; 
 (f) human resources
including searching for and hiring of executives other than in respect of specific transactions; and 
 (g) other
services for the Companies or any of the Beneficiary Affiliates upon which the Company and the Advisors agree. 
 Legal services
will not be provided by the Advisors. The Advisory Services will be conducted in support of the members of management and boards of directors of the Companies and their Beneficiary Affiliates. For the avoidance of doubt, such services shall be
considered provided by outside Advisors, not managers, of the Companies and their respective Beneficiary Affiliates. Pursuant to this Agreement, the Advisors shall not have any authority or power to commit either Company or any of their respective
Subsidiaries to any contracts with third parties. 
 3. Advisory Fees and Expenses. 

In consideration for the performance of the Advisory Services, the Companies hereby agree to pay (or to procure that one or more of the Beneficiary
Affiliates shall pay), the following fees. 
 (a) The Companies shall pay (in accordance with
Section 3(b)) to the Advisors (or, at the Advisors’ request, their designee(s)): 
 (i) an
aggregate annual amount equal to USD four million (USD 4,000,000) plus VAT thereon in each case where it is applicable, and 
 (ii) all reasonable out-of-pocket expenses incurred by each of the Advisors and/or their Affiliates in rendering the Advisory Services, including irrecoverable VAT thereon (“Advisory
Expenses”), 
 together, (the “Advisory Fees”). 

(b) The Advisory Fees shall be payable in accordance with this Section 3(b). On or before the date that is 5
Business Days following the end of each calendar quarter, the Companies shall pay to the Advisors (or at the Advisors’ request, to the designee(s)): 

  
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 (i) USD one million (USD 1,000,000) (which amount shall be pro rated in the
case of any calendar quarter in which the Advisory Services are not provided for the duration of such quarter); plus  
 (ii) in each case where it is applicable, VAT on the amount in (i) above, plus  
 (iii) the Advisory Expenses incurred by the Advisors during such quarter, 
 and the
aggregate of (i) to (iii) (inclusive) shall be referred to herein as the “Quarterly Fee”. The Quarterly Fee shall be divided between the Companies according to their (or their respective Beneficiary Affiliates’)
relative use of the Advisory Services during such quarter and shall be paid by wire transfer in cash or other immediately available funds to the account(s) designated by the Advisors. Each Company, regardless of whether or not it recharges any part
of its proportion of a Quarterly Fee to its Subsidiaries or Affiliates, shall be severally liable for its proportion; provided however that, if either or both of the Companies is/are prohibited from paying any portion of a Quarterly
Fee by virtue of any legal or contractual restrictions, the non-payment of such portion shall not constitute a default and such portion shall be paid to the Advisors immediately upon such dates as such payment is no longer prohibited; and in the
interim, such unpaid portion of each applicable Quarterly Fee shall accrue interest at a rate of 4 percent (4%) above LIBOR per annum (the “Accrued Quarterly Fees”). In the event that neither of the Companies actually uses the
Advisory Services during any calendar quarter, the Quarterly Fee shall be borne equally by both Companies. 
 (c)
Upon termination of this Agreement for any reason under Section 1, all amounts payable pursuant to Section 3(b) shall become immediately due and payable (including without limitation all amounts payable in respect of Advisory
Services rendered between the termination date and the end of the previous calendar quarter) and, in addition, in the event that this Agreement terminates in circumstances which constitute a “separation of services” within the meaning of
Section 409A of the Internal Revenue Code of 1986, as amended, (but excluding termination (i) resulting from an uncured willful material breach by an Advisor, or (ii) pursuant to Section 1(iv)) the net present value (using
a discount rate equal to the yield as of such termination date on U.S. Treasury securities of like maturity based on the times such payments would have been due) of the Advisory Fees (but excluding Advisory Expenses) that would have been payable
with respect to the period from the termination date through the tenth anniversary of the date hereof or, in the case of any extension thereof, through the end of such extension period, shall become immediately due and payable in a single cash lump
sum. 
 (d) Unless otherwise agreed in writing by the parties, the Advisory Fees and payment terms specified in
Section 3(b) shall continue to apply during any extension, if any, of the Term of this Agreement pursuant to Section 1. 
 (e) All Advisory Fees payable to the Advisors hereunder shall be allocated between the Advisors as they shall direct the Companies by joint notice and shall be

  
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paid by wire transfer in cash or other immediately available funds to the account(s) designated by the Advisors. 

4. Recharge of Fees. The Advisors acknowledge that the Companies may recharge to the respective Beneficiary
Affiliates such proportion of their share of each Quarterly Fee as relates to the benefit provided to such Beneficiary Affiliates by the provision of the Advisory Services during the applicable calendar quarter. The Advisors shall, if requested,
provide the Companies and/or the Beneficiary Affiliates (as relevant), with such evidence as they may reasonably request, of the Advisory Services provided for any calendar quarter. 

5. Personnel. The Advisors shall provide and devote to the performance of this Agreement such partners, employees
and agents of the Advisors as the Advisors shall deem appropriate to the provision of the Advisory Services required; provided, however, that no minimum number of hours is required to be devoted by the Advisors on a weekly, monthly, annual or
other basis. The Companies and the Subsidiaries acknowledge that the Advisors’ services are not exclusive to the Companies and the Subsidiaries and that the Advisors will render similar services to other persons and entities. 

6. Liability. None of the Advisors or their Affiliates (or their respective members, managers, affiliates,
officers, controlling persons, fiduciaries, employees and agents in their capacity as such) (collectively, the “Advisors’ Group”) shall be liable to any of the Companies or the Beneficiary Affiliates for any Loss arising out of
or in connection with the performance of the Advisory Services contemplated by this Agreement. The Advisor makes no representations or warranties, express or implied, in respect of the Advisory Services. Except as the Advisor may otherwise agree in
writing after the date hereof: (a) each member of the Advisor’s Group shall have the right to, and shall have no duty (contractual or otherwise) not to, directly or indirectly (i) engage in the same or similar business activities or
lines of business as either of the Companies or any of the Beneficiary Affiliates or (ii) do business with any client or customer of either of the Companies or any of the Beneficiary Affiliates; (b) no member of the Advisor’s Group
shall be liable to either of the Companies or any of the Beneficiary Affiliates for breach of any duty (contractual or otherwise) by reason of any the activities referenced in (i) above or of such member’s participation therein; and
(c) in the event that any member of the Advisor’s Group acquires knowledge of a potential transaction or matter that may constitute an opportunity (or potential opportunity) for either of the Companies or the Beneficiary Affiliates, no
member of the Advisor’s Group shall have any duty (contractual or otherwise) to communicate or present such corporate opportunity to either of the Companies or any of the Beneficiary Affiliates, and, notwithstanding any provision of this
Agreement to the contrary, no member of the Advisor’s Group shall be liable to either of the Companies or any of the Beneficiary Affiliates for breach of any duty (contractual or otherwise) by reason of the fact that any member of the
Advisor’s Group directly or indirectly pursues or acquires such opportunity for itself, directs such opportunity to another Person, or does not present such opportunity to either of the Companies or any of the Beneficiary Affiliates. In no
event will any member of the Advisor’s Group be liable to either of the Companies or any of the Beneficiary Affiliates for any indirect, special, incidental or consequential damages, including lost profits or

  
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savings, whether or not such damages are foreseeable, or in respect of any liabilities relating to any third party Claims (whether based in contract, tort or otherwise) but excluding Claims under
Section 7. 
 7. Indemnity. In consideration of the execution and delivery of this Agreement by the
Advisors, the Companies shall jointly and severally indemnify, exonerate and hold each member of the Advisors’ Group (collectively, the “Indemnitees”), each of whom is an intended third party beneficiary of this Agreement and
may specifically enforce the Companies’ obligations hereunder (including but not limited to the obligations specified in this Section 7), free and harmless from and against any and all Loss arising from any Claim (collectively, the
“Indemnified Liabilities”), incurred by the Indemnitees or any of them as a result of, arising out of, or in any way relating to the execution, delivery, performance, enforcement or existence of this Agreement or the Advisory
Services contemplated hereby, except for any such Indemnified Liabilities arising from such Indemnitee’s gross negligence or willful misconduct, and if and to the extent that the foregoing undertaking may be unavailable or unenforceable for any
reason, the Companies hereby agree to make the maximum contribution to the payment and satisfaction of each of the Indemnified Liabilities that is permissible under applicable law. For purposes of this Section 7, none of the circumstances
described in the limitations contained in the immediately preceding sentence shall be deemed to apply absent a final non-appealable judgment of a court of competent jurisdiction to such effect, in which case to the extent any such limitation is so
determined to apply to any Indemnitee as to any previously advanced indemnity payments made by the Companies, then such payments shall be promptly repaid by such Indemnitee to the Companies. The rights of any Indemnitee to indemnification hereunder
will be in addition to any other rights any such person may have under any other agreement or instrument referenced above or any other agreement or instrument to which such Indemnitee is or becomes a party or is or otherwise becomes a beneficiary or
under law or regulation. The Companies hereby agree that the Companies are the indemnitors of first resort (i.e., their obligations to Indemnitees under this Agreement are primary and any obligation of the Advisors (or any Affiliate thereof) to
provide advancement or indemnification for the same Indemnified Liabilities (including all interest, assessments and other charges paid or payable in connection with or in respect of such Indemnified Liabilities) incurred by Indemnitees are
secondary), and if the Advisors (or any Affiliate thereof) pay or cause to be paid, for any reason, any amounts otherwise indemnifiable hereunder or under any other indemnification agreement (whether pursuant to contract, bylaws or charter) with any
director or officer of the Companies, then (i) the Advisors (or such Affiliate, as the case may be) shall be fully subrogated to all rights of Indemnitee with respect to such payment and (ii) the Companies shall reimburse the Advisors (or
such Affiliate, as the case may be) for the payments actually made and waives any right of subrogation, reimbursement, exoneration, contribution or indemnification and any right to participate in any Claim or remedy of any Indemnitee against any
Indemnitee, whether such Claim, remedy or right arises in equity or under contract, statute, common law or otherwise, including any right to claim, take or receive from any Indemnitee, directly or indirectly, in cash or other property or by set-off
or in any other manner, any payment or security or other credit support on account of such Claim, remedy or right. 

  
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 8. Severability. Whenever possible, each provision of this Agreement
shall be interpreted in such manner as to be effective and valid under applicable law, but if any provision of this Agreement is held to be invalid, illegal, or unenforceable in any respect under applicable law or rule in any jurisdiction, such
invalidity, illegality, or unenforceability shall not effect the validity, legality, or enforceability of any other provision of this Agreement in such jurisdiction or affect the validity, legality, or enforceability of any provision in any other
jurisdiction. Instead, this Agreement shall be reformed, construed and enforced in such jurisdiction as if such invalid, illegal, or unenforceable provision had never been contained herein. 

9. Notices. All notices, demands or other communications to be given or delivered under or by reason of the
provisions of this Agreement shall be in writing and shall be deemed to have been given (a) when delivered personally to the recipient, (b) when telecopied to the recipient (with hard copy sent to the recipient by internationally reputable
overnight courier service (charges prepaid) that same day) if telecopied before 5:00 p.m., local time in the jurisdiction of recipient on a Business Day, and otherwise on the next Business Day, or (c) two (2) Business Days after being sent
to the recipient by internationally reputable overnight courier service (charges prepaid). Such notices, demands and other communications shall be sent to the parties hereto at the addresses set forth below. 

To the Advisors: 
  

			
	Bain Capital Partners, LLC
	111 Huntington Avenue
	Boston,
	MA 02199
	United States of America
		
	Fax:	 	    +1 617-516-2010
	Attention:	 	    Sean Doherty
	
	 Portfolio Company Advisors Limited
 c/o Bain Capital Ltd.

	Devonshire House 6th Flr
	Mayfair Place
	London, W1J 8AJ
		
	Fax:	 	    +1 617-516-2010
	Attention:	 	    Sean Doherty
	
	in each case with a copy (which shall not constitute notice) to:
	Kirkland & Ellis LLP
	601 Lexington Avenue
	New York, NY 10022
	United States

  
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	Fax:	 	    +1 212-446-4900
	Attention:	 	    Eunu Chun

 To
the Companies: 
  

			
	Styron Holding BV
	Postbus 48
	4530AA
	Terneuzen
	The Netherlands
		
	Fax:	 	    +31 0115 672 423
	Attention:	 	    General Counsel
	
	 Bain Capital Everest US Holding Inc.
 c/o Bain Capital Partners, LLC

	590 Madison Avenue, 42nd Floor
	New York, NY 10022
	United States of America
		
	Fax:	 	    +1 (212) 421-2225
	Attention:	 	    General Counsel
	
	in each case with a copy (which shall not constitute notice) to:
	Kirkland & Ellis LLP
	601 Lexington Avenue
	New York, NY 10022
	United States
		
	Telephone:	 	    +1 212-446-4800
	Fax:	 	    +1 212-446-4900
	Attention:	 	    Eunu Chun

 10. Certain Definitions. For purposes of this Agreement: 

(a) “Accrued Quarterly Fees” has the meaning set forth in Section 3(b). 

(b) “Advisors” has the meaning set forth in the preamble; 

(c) “Advisors’ Group” has the meaning set forth in Section 6; 

(d) “Advisory Expenses” has the meaning set forth in Section 3(a). 

(e) “Advisory Fee” and “Advisory Fees” have the meaning set forth in
Section 3(a). 
 (f) “Advisory Services” has the meaning set forth in
Section 2. 

  
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 (g) “Affiliate” of any particular Person means any other
Person controlling, controlled by or under common control with such particular Person, where “control” means the possession, directly or indirectly, of the power to direct the management and policies of a Person whether through the
ownership of voting securities, contract, or otherwise; 
 (h) “Agreement” has the meaning set
forth in the preamble; 
 (i) “Beneficiary Affiliate” and “Beneficiary
Affiliates” have the meanings set forth in the preamble; 
 (j) “Business Day” means
any day from Monday to Friday (inclusive) other than public bank holidays during normal working hours in New York, New York, United States of America, London, England and the Grand Duchy of Luxembourg; 

(k) “Change of Control” means any (i) sale or transfer by any of the Company or the Beneficiary
Affiliates of all or substantially all of the Company’s or Beneficiary Affiliates’ respective assets on a consolidated basis, (ii) consolidation, merger or reorganization of the Company or the Beneficiary Affiliates with or into any
other entity or entities as a result of which the holders of the Company’s or Beneficiary Affiliates’ outstanding capital stock possessing the voting power (under ordinary circumstances) to elect a majority of the board of directors
immediately prior to such consolidation, merger or reorganization cease to own the outstanding capital stock of the surviving corporation possessing the voting power (under ordinary circumstances) to elect a majority of the surviving
corporation’s board of directors, or (iii) issuance by the Company or the Beneficiary Affiliates or sale or transfer to any third party of shares of the Company’s or Beneficiary Affiliates’ capital stock by the holders thereof as
a result of which the holders of the Company’s or Beneficiary Affiliates’ outstanding capital stock possessing the voting power (under ordinary circumstances) to elect a majority of the board of directors immediately prior to such sale or
transfer cease to own the outstanding capital stock of the Company or Beneficiary Affiliates possessing the voting power (under ordinary circumstances) to elect a majority of the board of directors; 

(l) “Claims” means any action, claim, cause of action, suit or similar; 

(m) “Company” has the meaning set forth in the preamble; 

(n) “Indemnitees” has the meaning set forth in Section 7; 

(o) “Indemnified Liabilities” has the meaning set forth in Section 7; 

(p) “Initial Public Offering” shall mean the initial public offering and sale of shares of capital stock
of either of the Companies or any Beneficiary Affiliate (or any successor of any of them) for cash pursuant to an effective registration statement under the Securities Act of 1933, as amended or equivalent foreign securities laws (other than a
registration statement on Form S-4 or S-8 (or any similar or successor form)); 

  
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 (q) “Loss” means losses, liabilities, damages, costs and/or
expenses in connection therewith, including without limitation all reasonable attorneys’ fees, retainers, court costs, transcript costs, fees and costs of experts, witness fees, travel expenses, duplicating costs, printing and binding costs,
telephone charges, postage, delivery service fees, and all other disbursements or expenses of the types customarily incurred in connection with prosecuting, defending, preparing to prosecute or defend, investigating, being or preparing to be a
witness in, responding to a subpoena, or otherwise participating in, any proceeding including, but not limited to, litigation expenses incurred after the date on which none of the Advisors’ respective Affiliates or associated investment funds
own an interest in either of the Companies, the premium for appeal bonds, attachment bonds or similar bonds and all interest, assessments and other charges paid or payable in connection with or in respect of any such expenses; 

(r) “Person” means an individual, a partnership, a corporation, a limited liability Company, an
association, a joint stock Company, a trust, a joint venture, an unincorporated organization and a governmental entity or any department, agency or political subdivision thereof. 

(s) “Quarterly Fee” has the meaning set forth in Section 3(b); 

(t) “Subsidiary” and “Subsidiaries” means, with respect to any Person, any corporation,
limited liability company, partnership, association or other business entity of which (i) if a corporation, a majority of the total voting power of shares of stock entitled (without regard to the occurrence of any contingency) to vote in the
election of directors, managers or trustees thereof is at the time owned or controlled, directly or indirectly, by that Person or one or more of the other Subsidiaries of that Person or a combination thereof, or (ii) if a limited liability
company, partnership, association or other business entity, a majority of the limited liability company, partnership or other similar ownership interest thereof is at the time owned or controlled, directly or indirectly, by any Person or one or more
Subsidiaries of that Person or a combination thereof. For purposes hereof, a Person or Persons shall be deemed to have a majority ownership interest in a limited liability company, partnership, association or other business entity if such Person or
Persons shall be allocated a majority of limited liability company, partnership, association or other business entity gains or losses or shall be or control the managing director or general partner of such limited liability company, partnership,
association or other business entity; 
 (u) “Tax” means any tax, assessment or other central or
local government charge of any nature whatsoever of any jurisdiction; 
 (v) “Term” has the
meaning set forth in Section 1; and 
 (w) “VAT” means any value added, sales,
turnover, consumption or similar Tax of any jurisdiction. 
 11. Assignment. No party may assign any
obligations hereunder to any other entity without the prior written consent of the other parties (which consent shall not be 

  
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unreasonably withheld); provided that the Advisors may, without the consent of either of the Companies, assign any of its rights and obligations under this Agreement to any of its
Affiliates, whereupon, in each case, the assignor nevertheless shall remain liable for the performance of its obligations hereunder. 
 12. Amendment and Waiver. Except as otherwise provided herein, no modification, amendment, or waiver of any provision of this Agreement shall be effective against any party hereto unless such
modification, amendment, or waiver has been approved in writing by such party. No course of dealing or the failure of any party to enforce any of the provisions of this Agreement shall in any way operate as a waiver of such provisions and shall not
affect the right of such party thereafter to enforce each and every provision of this Agreement in accordance with its terms. 
 13. Successors. This Agreement and all the obligations and benefits hereunder shall bind and inure to the benefit of and be enforceable by the parties hereto and the respective successors and
assigns of each of them. 
 14. Counterparts. This Agreement may be executed in multiple counterparts,
each of which shall be an original and all of which taken together shall constitute one and the same agreement. 

15. Remedies. Any person having rights under any provision of this Agreement shall be entitled to enforce their
rights under this Agreement specifically, to recover damages by reason of any breach of any provision of this Agreement and to exercise all other rights existing in their favor. 

16. Entire Agreement. Except as otherwise expressly set forth herein, this Agreement embodies the complete
agreement and understanding among the parties hereto with respect to the subject matter hereof and supersedes and preempts any prior understandings, agreements or representations by or among the parties, written or oral, which may have related to
the subject matter hereof in any way. 
 17. Governing Law. All issues concerning this Agreement shall be
governed by and construed in accordance with the laws of the State of New York, without giving effect to any choice of law or conflict of law provision or rule (whether of the State of New York or any other jurisdiction) that would cause the
application of the law of any jurisdiction other than the State of New York. 
 18. Business Days. If any
time period for giving notice or taking action hereunder expires on a day other than a Business Day, the time period shall automatically be extended to the Business Day immediately following such day. 

19. Descriptive Headings. The descriptive headings of this Agreement are inserted for convenience only and do not
constitute a part of this Agreement. 
 20. No Strict Construction. The language used in this Agreement
shall be deemed to be the language chosen by the parties hereto to express their mutual intent, and no rule of strict construction shall be applied against any party. 

  
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 *     *     *    
*     * 

  
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 IN WITNESS WHEREOF, the parties hereto have executed this Advisory Agreement as of the date first written
above. 
  

					
	BAIN CAPITAL PARTNERS, LLC
		
	By:	 	 /s/ Michael F. Goss

		 	Name:	 	Michael F. Goss
		 	Title:	 	Managing Director
	
	PORTFOLIO COMPANIES ADVISORS LIMITED
		
	By:	 	 /s/ Michael Goss

		 	Name:	 	MICHAEL GOSS
		 	Title:	 	MANAGING DIRECTOR

  
 [Signature
Page to Advisory Agreement] 

 IN WITNESS WHEREOF, the parties hereto have executed this Advisory Agreement as of the date first written
above. 
  

					
	STYRON HOLDING BV
		
	By:	 	 /s/ F.J.C.M. Kempenaars

		 	Name:	 	F.J.C.M. KEMPENAARS
		 	Title:	 	DIRECTOR

  
 [Signature
Page to Advisory Agreement] 

 IN WITNESS WHEREOF, the parties hereto have executed this Advisory Agreement as of the date first written
above. 
  

					
	BAIN CAPITAL EVEREST US HOLDING INC.
		
	By:	 	 /s/ Stephen M. Zide

		 	Name:	 	Stephen M. Zide
		 	Title:	 	President

  
 [Signature
Page to Advisory Agreement]Transaction Services Agreement, dated June 17, 2010

 Exhibit 10.11 
 TRANSACTION SERVICES AGREEMENT 
 This Transaction Services Agreement
(this “Agreement”) is made and entered into as of 17 June 2010, by and between Bain Capital Everest US Holding Inc., a Delaware company (the “Company”) and Bain Capital Partners, LLC, a Delaware limited
liability company (the “Advisor”). Certain defined terms that are used but not otherwise defined herein have the meanings given to such terms in Section 10. 

WHEREAS, Transaction Services (as defined herein) have been rendered since 11 May 2010 and shall continue to be rendered to the
Company and certain of its Subsidiaries and Affiliates (each, a “Beneficiary Affiliate”) in connection with the transactions contemplated by, and consequential upon, the Acquisition Agreement and future transactions; 

WHEREAS, the Company hereby confirms its wish to retain the Advisor, and the Advisor confirms its wish to be retained, to provide the
Transaction Services to the Company and to each of the Beneficiary Affiliates; and 
 NOW, THEREFORE, in consideration of the
premises and mutual covenants contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties to this Agreement hereby agree as follows: 

1. Term. This Agreement shall be in effect for an initial term commencing on the Effective Date and ending on the
tenth (10th) anniversary thereof (the “Term”), which initial term shall be automatically extended thereafter on a year-to-year basis unless the Advisors provide written notice of the desire to terminate this Agreement to the
Company at least ninety (90) days prior to the expiration of the Term or any extension thereof. Notwithstanding anything to the contrary in this Agreement, this Agreement may be terminated prior to the tenth (10th) anniversary of the
Effective Date upon (i) a willful material breach of this Agreement by a party which is not cured within thirty (30) days of receipt of a written notice from the other party requiring cure, (ii) the earlier of (A) consummation of
a Change of Control, or (B) an Initial Public Offering (and in each case this Agreement shall terminate automatically without further act of the parties), (iii) written agreement of the Company and the Advisor, or (iv) the Advisor
otherwise serving a written termination notice on the Company. The provisions of Sections 6 to 20 (inclusive) shall survive any termination of this Agreement. 
 2. Transaction Services. The parties hereto agree that certain transaction-specific services, as further described below (collectively, the “Transaction Services”) shall be
performed from the Effective Date for the benefit of the Company and the Beneficiary Affiliates. The Transaction Services provided may be evidenced by documentation to be agreed upon between the Company and the Advisor. The Transaction Services
shall be provided in connection with the transactions described in Sections 3(a) and 3(b), and may include, without limitation, the following: 
 (a) advice and support relating to the identification, negotiation and analysis of specific acquisitions and dispositions by any of the Company or the Beneficiary Affiliates, including, without
limitation, any share, asset or debt purchase or disposition; 

 (b) advice and support relating to the negotiation of transaction-specific
financing (and consideration of financing alternatives), including, without limitation, in connection with acquisitions, capital expenditures and refinancing of existing indebtedness; 

(c) other advice relating to transaction-specific finance , including assistance in the preparation of financial
projections and monitoring of compliance with financing agreements; 
 (d) advice relating to
transaction-specific marketing issues, including assessment of marketing plans and strategies relating to specific transactions; 
 (e) advice relating to transaction-specific human resource issues, including searching and hiring of executives with respect to specific transactions; and 

(f) other transaction-specific services for the Company or the Beneficiary Affiliates upon which the boards of directors
of the Company and the Advisor agree. 
 Legal services will not be provided by the Advisor. The Transaction Services will be
conducted in support of the members of management and boards of directors of the Company and the Beneficiary Affiliates and, for the avoidance of doubt, such services shall be considered provided by outside consultants, not managers, of the Company
and the Beneficiary Affiliates. Pursuant to this Agreement, the Advisor shall not have any authority or power to commit the Company and/or its Subsidiaries to any contracts with third parties. 

3. Transaction Fees and Expenses. 
 In consideration for Transaction Services performed from the Effective Date for the Company or the Beneficiary Affiliates, the Company hereby agrees to pay (or to procure that any one or more Beneficiary
Affiliates shall pay), the following transaction fees (collectively, the “Transaction Fees”): 

(a) In connection with the consummation of the Acquisition and transactions consequential thereon, the Company agrees to
pay (or shall procure that any one or more of the Beneficiary Affiliates shall pay) a transaction fee in an aggregate amount equal to fifteen million United States Dollars (US$15,000,000) plus VAT (if applicable). In addition, the Company will
reimburse the Advisor or its designee, by wire transfer of immediately available funds on the Effective Date, for its reasonable travel expenses and other reasonable out of pocket fees and expenses (including without limitation the fees and expenses
of accountants, attorneys and other advisors retained by the Advisor) incurred in connection with the investigation, negotiation, and consummation of the Acquisition. 

(b) In connection with (i) the consummation of each acquisition (other than the Acquisition) including, without
limitation, any share, asset or debt purchase, (ii) the consummation of each divestiture including, without limitation, any share, asset or debt divestiture, (iii) the provision of advice to management regarding each transaction that
results in a Change of Control of the Company or any Beneficiary Affiliate, and/or (v) 

  
 -2-

 
debt or equity financing, by, of or involving the Company or any Beneficiary Affiliates, the Company agrees to pay (or shall procure that a Beneficiary Affiliate shall pay), to the extent
lawfully permitted, an aggregate transaction fee in an amount equal to one percent (1%) of the aggregate consideration for such transaction (in each case, whether such transaction is by way of merger, purchase or sale of stock or other
securities, purchase or sale or other disposition of assets or debt, recapitalization, reorganization, consolidation, tender offer, public offering, or otherwise and whether consummated directly by the Company and/or any of the Beneficiary
Affiliates or indirectly by, of or involving any of their respective equity owners or corporate parents), plus VAT in each case where it is applicable. 
 All Transaction Fees shall be paid by wire transfer in cash or other immediately available funds to the account(s) designated by the Advisor. 

4. Recharge of Fees. The Advisor acknowledges that the Company may recharge to the Beneficiary Affiliates such
proportion of the Transaction Fees that it pays and as relates to the benefit provided to such Beneficiary Affiliates by the relevant Transaction Services. The Advisor shall, if requested, provide the Company and the Beneficiary Affiliates with such
evidence as they may reasonably request of the Transaction Services provided for the benefit of the Company and such Beneficiary Affiliates. 
 5. Personnel. The Advisor shall provide and devote to the performance of this Agreement such partners, employees and agents of the Advisor as the Advisor shall deem appropriate to the furnishing of
the Transaction Services; provided however that, no minimum number of hours is required to be devoted by the Advisor on a weekly, monthly, annual or other basis. 

6. Liability. None of the Advisor or its Affiliates (or their respective members, managers, affiliates, officers,
controlling persons, fiduciaries, employees and agents in their capacity as such) (collectively, the “Advisor’s Group”) shall be liable to any of the Company or the Beneficiary Affiliates for any Loss arising out of or in
connection with the performance of the Transaction Services contemplated by this Agreement. The Advisor makes no representations or warranties, express or implied, in respect of the Transaction Services. Except as the Advisor may otherwise agree in
writing after the date hereof: (a) each member of the Advisor’s Group shall have the right to, and shall have no duty (contractual or otherwise) not to, directly or indirectly (i) engage in the same or similar business activities or
lines of business as the Company or any of the Beneficiary Affiliates or (ii) do business with any client or customer of the Company or any of the Beneficiary Affiliates; (b) no member of the Advisor’s Group shall be liable to the
Company or any of the Beneficiary Affiliates for breach of any duty (contractual or otherwise) by reason of any the activities referenced in (i) above or of such member’s participation therein; and (c) in the event that any member of
the Advisor’s Group acquires knowledge of a potential transaction or matter that may constitute an opportunity (or potential opportunity) for any of the Company or the Beneficiary Affiliates, no member of the Advisor’s Group shall have any
duty (contractual or otherwise) to communicate or present such corporate opportunity to the 

  
 -3-

 
Company or any of the Beneficiary Affiliates, and, notwithstanding any provision of this Agreement to the contrary, no member of the Advisor’s Group shall be liable to the Company or any of
the Beneficiary Affiliates for breach of any duty (contractual or otherwise) by reason of the fact that any member of the Advisor’s Group directly or indirectly pursues or acquires such opportunity for itself, directs such opportunity to
another Person, or does not present such opportunity to the Company or any of the Beneficiary Affiliates. In no event will any member of the Advisor’s Group be liable to any of the Company or any of the Beneficiary Affiliates for any indirect,
special, incidental or consequential damages, including lost profits or savings, whether or not such damages are foreseeable, or in respect of any liabilities relating to any third party claims (whether based in contract, tort or otherwise) third
party Claims (whether based in contract, tort or otherwise) but excluding Claims under Section 7. 
 7.
Indemnity. In consideration of the execution and delivery of this Agreement by the Advisor, the Company shall indemnify, exonerate and hold each member of the Advisor’s Group (collectively, the “Indemnitees”), each of
whom is an intended third party beneficiary of this Agreement and may specifically enforce the Company’s obligations hereunder (including but not limited to the obligations specified in this Section 7), free and harmless from and against
any and all Loss arising from any Claim (collectively, the “Indemnified Liabilities”), incurred by the Indemnitees or any of them as a result of, arising out of, or in any way relating to the execution, delivery, performance,
enforcement or existence of this Agreement or the Transaction Services contemplated hereby, except for any such Indemnified Liabilities arising from such Indemnitee’s gross negligence or willful misconduct, and if and to the extent that the
foregoing undertaking may be unavailable or unenforceable for any reason, the Company hereby agrees to make the maximum contribution to the payment and satisfaction of each of the Indemnified Liabilities that is permissible under applicable law. For
purposes of this Section 7, none of the circumstances described in the limitations contained in the immediately preceding sentence shall be deemed to apply absent a final non-appealable judgment of a court of competent jurisdiction to such
effect, in which case to the extent any such limitation is so determined to apply to any Indemnitee as to any previously advanced indemnity payments made by the Company, then such payments shall be promptly repaid by such Indemnitee to the Company.
The rights of any Indemnitee to indemnification hereunder will be in addition to any other rights any such person may have under any other agreement or instrument referenced above or any other agreement or instrument to which such Indemnitee is or
becomes a party or is or otherwise becomes a beneficiary or under law or regulation. The Company hereby agrees that the Company is the indemnitor of first resort (i.e., its obligations to Indemnitees under this Agreement are primary and any
obligation of the Advisor (or any Affiliate thereof) to provide advancement or indemnification for the same Indemnified Liabilities (including all interest, assessments and other charges paid or payable in connection with or in respect of such
Indemnified Liabilities) incurred by Indemnitees are secondary), and if the Advisor or any Affiliate thereof pays or causes to be paid, for any reason, any amounts otherwise indemnifiable hereunder or under any other indemnification agreement
(whether pursuant to contract, bylaws or charter) with any director or officer of the Company, then (i) the Advisor (or such Affiliate, as the case may be) shall be fully subrogated to all rights of Indemnitee with respect to such payment and
(ii) the Company shall reimburse the 

  
 -4-

 
Advisor (or such Affiliate, as the case may be) for the payments actually made and waives any right of subrogation, reimbursement, exoneration, contribution or indemnification and any right to
participate in any Claim or remedy of any Indemnitee against any Indemnitee, whether such Claim, remedy or right arises in equity or under contract, statute, common law or otherwise, including any right to claim, take or receive from any Indemnitee,
directly or indirectly, in cash or other property or by set-off or in any other manner, any payment or security or other credit support on account of such Claim, remedy or right. 

8. Severability. Whenever possible, each provision of this Agreement shall be interpreted in such manner as to be
effective and valid under applicable law, but if any provision of this Agreement is held to be invalid, illegal, or unenforceable in any respect under applicable law or rule in any jurisdiction, such invalidity, illegality, or unenforceability shall
not affect the validity, legality, or enforceability of any other provision of this Agreement in such jurisdiction or affect the validity, legality, or enforceability of any provision in any other jurisdiction. Instead, this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid, illegal, or unenforceable provision had never been contained herein. 
 9. Notices. All notices, demands or other communications to be given or delivered under or by reason of the provisions of this Agreement shall be in writing and shall be deemed to have been given
(a) when delivered personally to the recipient, (b) when telecopied to the recipient (with hard copy sent to the recipient by internationally reputable overnight courier service (charges prepaid) that same day) if telecopied before 5:00
p.m., local time in the jurisdiction of recipient on a Business Day, and otherwise on the next Business Day, or (c) two (2) Business Days after being sent to the recipient by internationally reputable overnight courier service (charges
prepaid). Such notices, demands and other communications shall be sent to the parties hereto at the addresses set forth below. 

To the Company: 
  

	
	 Bain Capital Everest US Holding Inc.
 c/o Bain Capital Partners, LLC
 590 Madison Avenue, 42nd Floor

New York, NY 10022
 United States of
America

  

			
	Fax:	  	 +1 (212) 421-2225

	Attention:	  	 General Counsel

 To the Advisor: 
  

	
	 Bain Capital Partners, LLC
 111
Huntington Avenue
 Boston,

  
 -5-

	
	 MA 02199
 United States of
America

  

			
	Fax:	  	 +1 617-516-2010

	Attention:	  	 Sean Doherty

  

	
	 with a copy (which shall not constitute notice) to:
 Kirkland & Ellis LLP
 601 Lexington Avenue

New York, NY 10022
 United
States

  

			
	Telephone:	  	 +1 212-446-4800

	Fax:	  	 +1 212-446-4900

	Attention:	  	 Eunu Chun

 10. Certain Definitions. For purposes of this Agreement: 

(a) “Acquisition” means the acquisition by the Company and certain of its Beneficiary Affiliates of the
Business; 
 (b) “Acquisition Agreement” means the Sale and Purchase Agreement dated
25 March 2010 by and among the Dow Chemical Company, Styron LLC, Styron Holding B.V. and STY Acquisition Corp; 
 (c) “Advisor” has the meaning set forth in the preamble; 
 (d) “Advisor’s Group” has the meaning set forth in Section 7; 
 (e) “Affiliate” shall mean, with respect to any Person, (i) any other Person which directly or indirectly through one or more intermediaries controls, or is controlled by, or is
under common control with, such Person (for the purposes of this definition, “control” (including, with correlative meanings, the terms “controlling,” “controlled by” and “under common control with”), as used
with respect to any Person, means the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such Person, whether through the ownership of voting securities, by agreement or otherwise), or
(ii) if such Person or other Person is an investment fund, any other investment fund the primary investment advisor to which is the primary investment advisor to either Person or an Affiliate thereof, and in relation to the Company includes for
the avoidance of doubt any Subsidiary of Bain Capital Everest Manager Holding S.C.A; 
 (f)
“Agreement” has the meaning set forth in the preamble; 
 (g) “Beneficiary
Affiliate” and “Beneficiary Affiliates” have the meanings set forth in the preamble; 

  
 -6-

 (h) “Business” means such of the business, assets and
shares of certain companies comprising the Styron group which are the subject of the acquisitions under the Acquisition Agreement; 
 (i) “Business Day” means any day from Monday to Friday (inclusive) other than public bank holidays during normal working hours in New York, New York, United States of America, London,
England and the Grand Duchy of Luxembourg; 
 (j) “Change of Control” means any (i) sale or
transfer by any of the Company or the Beneficiary Affiliates of all or substantially all of the Company’s or Beneficiary Affiliates’ respective assets on a consolidated basis, (ii) consolidation, merger or reorganization of the
Company or the Beneficiary Affiliates with or into any other entity or entities as a result of which the holders of the Company’s or Beneficiary Affiliates’ outstanding capital stock possessing the voting power (under ordinary
circumstances) to elect a majority of the board of directors immediately prior to such consolidation, merger or reorganization cease to own the outstanding capital stock of the surviving corporation possessing the voting power (under ordinary
circumstances) to elect a majority of the surviving corporation’s board of directors, or (iii) issuance by the Company or the Beneficiary Affiliates or sale or transfer to any third party of shares of the Company’s or Beneficiary
Affiliates’ capital stock by the holders thereof as a result of which the holders of the Company’s or Beneficiary Affiliates’ outstanding capital stock possessing the voting power (under ordinary circumstances) to elect a majority of
the board of directors immediately prior to such sale or transfer cease to own the outstanding capital stock of the Company or Beneficiary Affiliates possessing the voting power (under ordinary circumstances) to elect a majority of the board of
directors; 
 (k) “Claim” means any action, claim, cause of action, suit or similar; 

(1) “Company” has the meaning set forth in the preamble; 

(m) “Effective Date” means the completion date of the Acquisition; 

(n) “Indmenitees” has the meaning set forth in Section 7; 

(o) “Indemnified Liabilities” has the meaning set forth in Section 7; 

(p) “Initial Public Offering” shall mean the initial public offering and sale of shares of capital stock
of the Company or any Beneficiary Affiliate (or any successor of either) for cash pursuant to an effective registration statement under the Securities Act of 1933, as amended or equivalent foreign securities laws (other than a registration statement
on Form S-4 or S-8 (or any similar or successor form)) 
 (q) “Loss” means losses, liabilities,
damages, costs and/or expenses in connection therewith, including without limitation all reasonable attorneys’ fees, retainers, court costs, transcript costs, fees and costs of experts, witness fees, travel expenses, duplicating costs, printing
and binding costs, telephone charges, postage, delivery service fees, and all other disbursements or expenses of the types customarily incurred in connection with prosecuting, defending, preparing to prosecute or defend, investigating, 

  
 -7-

 
being or preparing to be a witness in, responding to a subpoena, or otherwise participating in, any proceeding including, but not limited to, litigation expenses incurred after the date on which
none of the Advisor’s respective Affiliates or associated investment funds own an interest in the Company, the premium for appeal bonds, attachment bonds or similar bonds and all interest, assessments and other charges paid or payable in
connection with or in respect of any such expenses; 
 (r) “Person” means an individual, a
partnership, a corporation, a limited liability company, an association, a joint stock company, a trust, a joint venture, an unincorporated organization and a governmental entity or any department, agency or political subdivision thereof.

 (s) “Subsidiary” and “Subsidiaries” means, with respect to any Person, any
corporation, limited liability company, partnership, association or other business entity of which (i) if a corporation, a majority of the total voting power of shares of stock entitled (without regard to the occurrence of any contingency) to
vote in the election of directors, managers or trustees thereof is at the time owned or controlled, directly or indirectly, by that Person or one or more of the other Subsidiaries of that Person or a combination thereof, or (ii) if a limited
liability company, partnership, association or other business entity, a majority of the limited liability company, partnership or other similar ownership interest thereof is at the time owned or controlled, directly or indirectly, by any Person or
one or more Subsidiaries of that Person or a combination thereof. For purposes hereof, a Person or Persons shall be deemed to have a majority ownership interest in a limited liability company, partnership, association or other business entity if
such Person or Persons shall be allocated a majority of limited liability company, partnership, association or other business entity gains or losses or shall be or control the managing director or general partner of such limited liability company,
partnership, association or other business entity; 
 (t) “Tax” means any tax, assessment or
other central or local government charge of any nature whatsoever of any jurisdiction; 
 (u)
“Term” has the meaning set forth in Section 1; 
 (v) “Transaction Fees”
has the meaning set forth in Section 3; 
 (w) “Transaction Services” has the meaning set
forth in Section 2; and 
 (x) “VAT” means any value added, sales, turnover, consumption or
similar Tax of any jurisdiction. 
 11. Assignment. No party may assign or delegate any obligations
hereunder to any other entity without the prior written consent of the other parties (which consent shall not be unreasonably withheld or delayed). 
 12. Amendment and Waiver. Except as otherwise provided herein, no modification, amendment, or waiver of any provision of this Agreement shall be effective against any party hereto unless such
modification, amendment, or waiver has been 

  
 -8-

 
approved in writing by such party. No course of dealing or the failure of any party to enforce any of the provisions of this Agreement shall in any way operate as a waiver of such provisions and
shall not affect the right of such party thereafter to enforce each and every provision of this Agreement in accordance with its terms. 
 13. Successors. This Agreement and all the obligations and benefits hereunder shall bind and inure to the benefit of and be enforceable by the parties hereto and the respective successors and
assigns of each of them. 
 14. Counterparts. This Agreement may be executed in multiple counterparts,
each of which shall be an original and all of which taken together shall constitute one and the same agreement. 

15. Remedies. Any person having rights under any provision of this Agreement shall be entitled to enforce their
rights under this Agreement specifically, to recover damages by reason of any breach of any provision of this Agreement and to exercise all other rights existing in their favor. 

16. Entire Agreement. Except as otherwise expressly set forth herein, this Agreement embodies the complete
agreement and understanding among the parties hereto with respect to the subject matter hereof and supersedes and preempts any prior understandings, agreements or representations by or among the parties, written or oral, which may have related to
the subject matter hereof in any way. 
 17. Governing Law. All issues concerning this Agreement shall be
governed by and construed in accordance with the laws of the State of New York, without giving effect to any choice of law or conflict of law provision or rule (whether of the State of New York or any other jurisdiction) that would cause the
application of the law of any jurisdiction other than the State of New York. 
 18. Business Days. If any
time period for giving notice or taking action hereunder expires on a day other than a Business Day, the time period shall automatically be extended to the Business Day immediately following such day. 

19. Descriptive Headings. The descriptive headings of this Agreement are inserted for convenience only and do not
constitute a part of this Agreement. 
 20. No Strict Construction. The language used in this Agreement
shall be deemed to be the language chosen by the parties hereto to express their mutual intent, and no rule of strict construction shall be applied against any party. 
 *    *    *    *    * 

  
 -9-

 IN WITNESS WHEREOF, the parties hereto have executed this Transaction Services Agreement as
of the date first written above. 
  

			
	COMPANY:
	
	Bain Capital Everest US Holding Inc.
	
	Acting by:
	
	 /s/ Stephen M. Zide

	Name:	 	Stephen M. Zide
	Title:	 	President
	
	  

	Name:	 	
	Title:	 	
	
	BAIN:
	
	Bain Capital Partners, LLC
		
	By:	 	 /s/ Stephen M. Zide

	Name:	 	 Stephen M. Zide

	Its:	 	 Managing Director

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