Document:

EX-10.21

 Exhibit 10.21 

LSF9 CONCRETE HOLDINGS LTD. 

LONG TERM INCENTIVE PLAN 

ARTICLE 1 
 ESTABLISHMENT
AND PURPOSE 
 Section 1.1 Establishment and Purpose. LSF9 Concrete Holdings Ltd., a company incorporated under the
laws of the Bailiwick of Jersey (the “Company”), hereby establishes the LSF9 Concrete Holdings Ltd. Long Term Incentive Plan (the “Plan”) as set forth in this document. The purpose of the Plan is to provide
motivation to certain key employees of the Company and its Subsidiaries to put forth maximum efforts toward the continued growth, profitability and success of the Company by providing incentives to such individuals through cash bonus payments. 

Section 1.2 Effective Date. The Plan shall be deemed effective as of the Closing (as defined in such agreement) of the transactions
contemplated by that certain Purchase Agreement, dated as of December 23, 2014, among HBMA Holdings LLC, Structherm Holdings Limited, Hanson America Holdings (4) Limited, Hanson Packed Products Limited, and LSF9 Stardust Holdings LLC, and, solely
for the purposes of Section 9.08 and Article XI thereto, Heidelbergcement AG (the “Effective Date”). 
 ARTICLE 2

 DEFINITIONS 

Section 2.1 Administrator. “Administrator” means the individual or individuals from time to time
designated by the Board to administer the Plan. At any time no such Administrator has been so designated, the term “Administrator” shall mean the Board until such time that no less than one Administrator has been designated by the Board.
In the event that more than one Administrator is designated by the Board to administer the Plan, all such Administrators shall be severally and individually authorized to take all actions, and make all determinations, called for hereunder and under
any Award Agreement. The initial Administrators shall be Jonathan Rosen and Chad Suss. 
 Section 2.2
Affiliate. “Affiliate” means any incorporated or unincorporated trade or business or other entity or person, other than the Company, that along with the Company is considered a single employer under Code Section
414(b) or Code Section 414(c); provided, however, that (i) in applying Code Section 1563(a)(1), (2), and (3) for the purposes of determining a controlled group of corporations under Code Section 414(b), the phrase “at least 50 percent”
shall be used instead of the phrase “at least 80 percent” in each place the phrase “at least 80 percent” appears in Code Section 1563(a)(1), (2), and (3), and (ii) in applying Treas. Reg. Section 1.414(c)-2 for the purposes
of determining trades or businesses (whether or not incorporated) that are under common control for the purposes of Code Section 414(c), the phrase “at least 50 percent” shall be used instead of the phrase “at least 80 percent”
in each place the phrase “at least 80 percent” appears in Treas. Reg. Section 1.414(c)-2. 
 Section 2.3 Award
Agreement. “Award Agreement” means a written agreement evidencing a Participant’s participation in this Plan. An Award Agreement shall be in the form 

 
of an agreement to be executed by the Participant and the Administrator on behalf of the Company. The form of Award Agreement is attached here as Exhibit C and the Administrator shall be
authorized to make such changes thereto as such Administrator shall deem necessary, advisable, or appropriate (subject always to Section 6.5 below). In the event of any inconsistency between the terms of the Plan and any Award Agreement, the
terms of the Award Agreement shall prevail.  
 Section 2.4 Beginning Equity Value. “Beginning Equity
Value” means four hundred thirty-two million three hundred seventy-nine thousand fifty-one dollars and eighty-nine cents ($432,379,051.89), as increased from time to time for any additional equity capital invested after the Effective Date,
all as determined by the Administrator (and as further adjusted, as appropriate, by the Administrator for any changes in the Company’s or its Affiliates’ capital structure). 

Section 2.5 Board. “Board” means the board of directors of the Company or other governing authority of the
Company, as applicable. 
 Section 2.6 Code. “Code” means the Internal Revenue Code of 1986, as amended from time to
time. 
 Section 2.7 Cumulative IRR. “Cumulative IRR” has the meaning set forth in Exhibit A. 

Section 2.8 Incentive Pool. “Incentive Pool” means the recordkeeping account established and maintained on
the books of the Company pursuant to this Plan. 
 Section 2.9 Liquidity Event. “Liquidity Event” means
the consummation of one or more of the following transactions: (i) Lone Star Fund IX (U.S.), L.P. and/or its Affiliates sell, transfer or otherwise dispose of all or a portion of their direct and indirect ownership interests in the Company or a
respective successor entity (whether through a direct sale, merger, consolidation, reorganization, or other similar transaction) to an unrelated third party for cash; (ii) a firm commitment underwritten public offering (a “Public
Offering”) of the equity interests of the Company or a respective successor entity that either (A) is registered under the Securities Act of 1933, as amended, or (B) results in such equity interests being admitted for trading on either the
Main Market or the AIM market of the London Stock Exchange, in each case, where Lone Star Fund IX (U.S.), L.P. and/or its Affiliates sell all or a portion of their direct and indirect ownership interests in the Company or a respective successor
entity, as applicable, in such Public Offering; or (iii) the payment by the Company of any cash distributions to Lone Star Fund IX (U.S.), L.P. and/or its Affiliates (including in connection with a sale of the assets of the Company or a respective
successor entity).  
 Section 2.10 Participant. “Participant” means an individual who is
selected by the Administrator to participate in this Plan and executes an Award Agreement evidencing such participation (in his or her individual capacity and not as Administrator). 

Section 2.11 Subsidiary. “Subsidiary” means any entity (other than the Company) in an unbroken chain of entities
beginning with the Company, if each of the entities other than the last entity in the unbroken chain owns equity possessing 50% or more of the total combined voting power in one of the other entities in such chain. 

  
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 ARTICLE 3 

ADMINISTRATION AND

INCENTIVE POOL ESTABLISHMENT 

Section 3.1 Plan Administration. The Plan shall be administered by the Administrator. The Administrator shall have total
and exclusive responsibility to control, operate, manage and administer the Plan in accordance with its terms. The Administrator shall have all the authority and discretion that may be necessary or helpful to enable it to discharge its
responsibilities with respect to the Plan. Without limiting the generality of the preceding sentence, the Administrator shall have the exclusive right to: (i) interpret this Plan; (ii) determine eligibility for participation in the Plan; (iii)
decide all questions concerning eligibility for, and the amount of, amounts payable under this Plan; (iv) construe any ambiguous provision of this Plan; (v) correct any defect, supply any omission or reconcile any inconsistency in this Plan; (vi)
issue administrative guidelines as an aid to administering the Plan and make changes in such guidelines as the Administrator from time to time deems proper; (vii) make regulations for carrying out this Plan and make changes in such regulations as
the Administrator from time to time deems proper; (viii) to the extent permitted under this Plan, grant waivers of Plan terms, conditions, restrictions and limitations; (ix) enter into Award Agreements and grant awards in replacement of awards
previously granted under the Plan or awards granted under any other employee benefit plan of the Company or its Affiliates; (x) engage legal or other counsel; and (xi) take any and all other actions the Administrator deems necessary or advisable for
the proper operation or administration of the Plan. The Administrator shall have full discretionary authority in all matters related to the discharge of its responsibilities and the exercise of its authority under the Plan, including, without
limitation, its construction of the terms of the Plan and its determination of eligibility for participation in and awards under the Plan. The decisions of the Administrator and its actions with respect to the Plan shall be final, conclusive and
binding on all persons having or claiming to have any right or interest in or under the Plan, including Participants and their respective estates, beneficiaries and legal representatives.  

Section 3.2 Liability and Indemnification. No Administrator (or member thereof, if applicable) shall be personally liable for any
action, interpretation or determination made in good faith with respect to the Plan or any Award Agreement, and the Administrator (and each member thereof, if applicable) shall be fully indemnified, defended and otherwise protected by the Company
with respect to any liability he or she may incur with respect to any such action, interpretation or determination, to the extent permitted by applicable law.  

Section 3.3 Incentive Pool. For Plan recordkeeping purposes, the Company shall establish and maintain on its books an account to
be known as the Incentive Pool. Amounts shall be credited to the Incentive Pool at the time of a Liquidity Event, as set forth on Exhibit A; provided that no amounts shall be credited to or paid from the Incentive Pool until (a) the
Company’s equity investors have received the return of their Beginning Equity Value, and (b) a 15% Cumulative IRR has been achieved, all as more fully set forth on Exhibit A. The Incentive Pool metrics on Exhibit A (and thus the amount to be
credited to the Incentive Pool) shall be adjusted as appropriate to account for any additional equity invested in the Company, and any 

  
 3 

 
other changes in the capital structure of the Company negotiated on an arms’ length basis. The preceding sentence shall also apply to events involving an Affiliate, as the Administrator
determines is appropriate. If the Company or an Affiliate effects a subdivision or split of its outstanding number of equity securities, the number of Pool Units (as defined below) granted and outstanding immediately before that subdivision or split
and the maximum aggregate number of interests in the Incentive Pool that may be granted under this Plan will be equitably increased by the Administrator, as determined in its sole discretion. Conversely, if the Company or an Affiliate at any time or
from time to time combines its outstanding equity securities, the number of Pool Units granted and outstanding immediately before the combination and the maximum aggregate number of interests in the Incentive Pool that may be granted under this Plan
shall be equitably decreased by the Administrator, as determined in its sole discretion. In the event of any recapitalization, exchange of shares, merger, reorganization, change in the corporate structure of the Company or an Affiliate or similar
event, the Administrator may make appropriate adjustments in the number and value of Pool Units granted under this Plan. Any adjustment under this section shall be effective at the close of business on the date the subdivision, split, combination,
recapitalization, or other described event becomes effective. 
 Section 3.4 Pool Units. Interests in the Incentive Pool shall be
granted in the form of bookkeeping units (each such interest, a “Pool Unit”). The maximum aggregate number of interests in the Incentive Pool that may be granted under this Plan is 1,000,000, subject to adjustment as described in
Section 3.3.  
 ARTICLE 4 

GRANT AND FORFEITURE OF POOL UNITS 

Section 4.1 Grant. Solely for the purpose of determining the amount of an incentive bonus to be paid to Participant under
this Plan, the Administrator shall enter into an Award Agreement with each Participant which shall grant to such Participant the number of Pool Units that is set forth in such Award Agreement.  

Section 4.2 Forfeiture of Participant’s Pool Units. Pool Units granted to Participants shall be subject to forfeiture as set forth
in the applicable Award Agreement. 
 ARTICLE 5 

INCENTIVE POOL PAYMENTS 

Section 5.1 Amount of Incentive Pool Payments. The value of the benefit to be paid to or with respect to Participant pursuant to this
Article 5 shall be determined as of the closing date of each Liquidity Event by (a) dividing the number of the Participant’s outstanding Pool Units by the aggregate number of all outstanding Pool Units, (b) multiplying the quotient obtained in
Section 5.1(a) by the applicable LE Participation Amount credited to the Incentive Pool pursuant to Section 3.3 and Exhibit A hereof, and (c) subtracting from the product obtained in Section 5.1(b) all prior payments made to the Participant pursuant
to this Section 5.1.  
 Section 5.2 Time and Form of Payment. Subject to Section 3.3 and the terms of any applicable Award
Agreement, Participant’s benefit under this Article 5 shall be paid to Participant in cash within sixty (60) days after the closing of a Liquidity Event. 

  
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 Section 5.3 Beneficiaries. Any amount payable under this Plan after Participant’s
death shall be paid when otherwise due hereunder to the beneficiary or beneficiaries (Participant’s “Beneficiary”) designated in accordance with the provisions of this Plan. Such designation of Participant’s Beneficiary
shall be made in writing on a form prescribed by and filed with the Administrator, and shall remain in effect until changed by Participant by the filing of a new beneficiary designation form with the Administrator. If Participant fails to so
designate a Beneficiary, or in the event all of the individuals designated as Participant’s Beneficiary are individuals who predecease Participant, any remaining amount payable under this Plan shall be paid to Participant’s estate when
otherwise due hereunder. 
 Section 5.4 Facility of Payment. If the Company shall find that Participant or Participant’s
Beneficiary is unable to care for his or her affairs because of illness or accident or is unable to execute a proper receipt for the payment of any amount payable under this Plan, the Company may make payment to a relative or other proper person for
the benefit of Participant or Participant’s Beneficiary. To the extent permitted by law, the payment to a person in accordance with this paragraph shall fully discharge the Company’s obligation to pay any amount due under this Plan. The
decision of the Administrator shall in each case be binding upon all persons in interest, and neither the Company nor the Administrator shall be under any duty to see to the proper application of such funds. 

ARTICLE 6 
 MISCELLANEOUS

 Section 6.1 No Guarantee of Employment. Nothing in this Plan or in a related Award Agreement shall confer upon
Participant any right to continue in the employ of the Company or any Subsidiary or interfere in any way with the right of the Company or a Subsidiary to terminate Participant’s employment at any time and for any reason.  

Section 6.2 No Joint Venture. This Plan and a related Award Agreement shall not be considered to create a joint venture between any
Participant and the Company or to provide a Participant with any ownership interest in the Company or any Affiliate or any right or interest with respect to the earnings and profits or assets of the Company or any Affiliate.  

Section 6.3 Pool Unit Not Salary. Neither the grant of Pool Units nor any payment to be made with respect thereto shall be deemed
salary or other compensation or remuneration to a Participant for the purpose of computing benefits to which a Participant may be entitled under any severance arrangement, retirement plan, employment agreement or other similar compensation or
remuneration scheme or arrangement that the Company or any Subsidiary may now or hereafter have or adopt.  
 Section 6.4 No
Funding. This Plan constitutes a mere promise by the Company to make payments in accordance with the terms hereof, and each Participant shall have the status of a general unsecured creditor of the Company and any
Affiliates. This Plan is unfunded and nothing in this Plan will be construed to set aside any assets of the Company or to give any Participant any rights to any specific assets of the Company or any Affiliate. 

  
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 Section 6.5 Amendment and Cancellation. The Administrator may amend the terms of this Plan
and/or any Award Agreement, but no such amendment shall materially reduce the aggregate amount reasonably expected to be paid to a Participant under this Plan without the prior written consent of such Participant. The Administrator may, with a
Participant’s written consent, cancel an Award Agreement granted under this Plan in exchange for a new award under the Plan.  

Section 6.6 Withholding Taxes. The Company or an Affiliate shall have the right to require a Participant to remit to the Company
or such Affiliate, or to withhold from other amounts payable to Participant, as compensation or otherwise, any amount required to satisfy all federal, state and local income and employment tax withholding requirements.  

Section 6.7 Notices. All notices and other communications under this Plan shall be in writing (including electronically) and shall be
given in person or by either personal delivery, personal email with return receipt requested, facsimile with confirmation of receipt, overnight delivery, or first class mail, certified or registered with return receipt requested, with postal or
delivery charges prepaid, and shall be deemed to have been duly given when delivered personally, emailed, or three days after mailing first class, certified or registered with return receipt requested. 

Section 6.8 Entire Plan. This Plan supersedes any and all other agreements either oral or written, between the parties hereto with
respect to the subject matter hereof. 
 Section 6.9 Severability and Waiver. If any provision contained in this Plan shall be
held to be invalid, illegal or unenforceable under present or future laws effective during the term hereof, such provision shall be fully severable; this Plan shall be construed and enforced as if such illegal, invalid, or unenforceable provision
had never comprised a part hereof; and the remaining provisions hereof shall remain in full force and effect and shall not be affected by the illegal, invalid, or unenforceable provision or by its severance herefrom. Furthermore, in lieu of such
illegal, invalid, or unenforceable provision, there shall be added automatically by the parties as a part hereof a provision as similar in terms to such illegal, invalid or unenforceable provision as may be possible and be legal, valid and
enforceable, and the parties hereby agree to such provision. Waiver by any party of any breach of this Plan or failure to exercise any right hereunder shall not be deemed to be a waiver of any other breach or right. The failure of any party to take
action by reason of such breach or to exercise any such right shall not deprive the party of the right to take action at any time while or after such breach or condition giving rise to such rights continues.  

Section 6.10 Modifications. No change or modification of this Plan shall be valid or binding upon the parties hereto, nor shall
any waiver of any term or condition be so binding, unless such change or modification or waiver shall be in writing and signed by the Company. No such change or modification to this Plan shall apply to outstanding Award Agreements except to the
extent necessary to conform the terms of this Plan to the requirements of Code Section 409A or other applicable tax laws.  

  
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 Section 6.11 Binding Effect. This Plan shall be binding upon and inure to the benefit of
(i) each Participant and Participant’s executors, administrators, personal representatives and heirs, and (ii) the Company, its successors and assigns.  

Section 6.12 Headings and Interpretation. Headings are for convenience only and are not deemed to be part of this Plan. Unless
otherwise indicated, any reference to a Section herein is a reference to a Section of this Plan.  
 Section 6.13 No Guarantee of
Tax Consequences. No person connected with this Plan in any capacity, including, but not limited to, the Company or any Affiliate and their respective members, partners, directors, officers, agents and employees, makes any
representation, commitment or guarantee that any tax treatment, including, but not limited to, federal, state and local income, estate and gift tax treatment, will be applicable with respect to any award granted to or for the benefit of any
Participant or that such tax treatment will apply to or be available to a Participant. Each Participant should consult with such Participant’s own tax advisor to determine the tax consequences to such Participant that are associated with
participating in the Plan.  
 Section 6.14 Governing Law. This Plan shall be construed in accordance with and governed
in all respects by the laws of the State of Texas.  
 Section 6.15 Assignment. This Plan and any related Award Agreement
is not assignable by any Participant without the prior written consent of the Company, and any attempted assignment without such consent shall be void ab initio. No right or interest of any Participant under this Plan and any related Award
Agreement may be assigned, transferred or alienated, in whole or in part, either directly or by operation of law, and no such right or interest shall be liable for or subject to any debt, obligation or liability of Participant. The Company shall be
permitted to assign this Plan and any related Award Agreement to any Affiliate, provided such Affiliate agrees to be fully bound by the terms of this Plan and any related Award Agreement and to meet all liabilities thereunder. Notwithstanding
anything herein to the contrary, this Plan and the obligations hereunder (and under any Award Agreement) shall be the sole liability of the Company and no Affiliate shall have any liability to any Participant as a result of this Plan or any Award
Agreement, unless and until any assignment thereof is effectuated pursuant to the immediately preceding sentence of this Section 6.15, and, upon any such assignment, the Company shall be automatically and totally released from any and all of
its obligations hereunder and under the related Award Agreements. 
 Section 6.16 Compliance With Code Section 409A. The
compensation payable to or with respect to any Participant pursuant to this Plan is intended to be compensation that is not subject to the tax imposed by Code Section 409A, and this Plan shall be administered and construed to the fullest extent
possible to reflect and implement such intent. 
 Section 6.17 Excess Parachute Payments. 

(a) Notwithstanding any other provision of the Plan to the contrary, if any payment or benefit by or from the Company or any of its Affiliates
to or for the benefit of a Participant, whether paid or payable or distributed or distributable pursuant to the terms of the 

  
 7 

 
Plan or otherwise (all such payments and benefits being collectively referred to herein as the “Payments”), would be subject to the Excise Tax (as defined in Section 6.17(h)), then the
following provisions of this Section 6.17 shall apply. 
 (b) Prior to the consummation of any transaction that would or may result in any
of the Payments payable or distributable to a Participant being subject to the Excise Tax, if the Company is or will be a corporation described in Code Section 280G(b)(5)(A)(ii)(I) immediately before the consummation of such transaction, then such
Participant shall have the right (but not the obligation) to enter into a written agreement with the Company and/or its Affiliates, as applicable (each, a “Waiver”), providing that (i) such Participant waives such Participant’s
right to receive some or all of such Payments (the “Waived Payments”) so that all Payments (other than the Waived Payments) applicable to such Participant shall not be deemed to be an “excess parachute payment” (as defined
in Code Section 280G(b)(1)) and would not be subject to the Excise Tax, and (ii) such Participant accepts in substitution for such Waived Payments the right to receive such Waived Payments only if approved by the stockholders of the Company in a
manner that complies with Code Section 280G(b)(5)(B). Each such Waiver shall identify the specific Waived Payments and shall provide that if such stockholder approval is not obtained, such Waived Payments shall not be paid to such Participant and
such Participant shall have no right or entitlement with respect thereto. As promptly as practicable after such Waiver is entered into between such Participant and the Company and/or its Affiliates, as applicable, but in any event prior to the
consummation of any such transaction, the Company shall use its best efforts to obtain such stockholder approval (in a manner that complies with Code Section 280G(b)(5)(B)) of the Waived Payments that have been conditioned in such Waiver on the
receipt of such stockholder approval. 
 (c) If, and to the extent that, such a Participant does not enter into a Waiver, then except as
otherwise provided in Section 6.17(d), the Payments shall be reduced (but not below zero) or eliminated (all as further provided for in Section 6.17(e)) to the extent the Independent Tax Advisor (as defined in Section 6.17(g)) shall reasonably
determine is necessary so that no portion of the Payments shall be subject to the Excise Tax. 
 (d) Notwithstanding the provisions of
Section 6.17(c), if the Independent Tax Advisor reasonably determines that a Participant would receive, in the aggregate, a greater amount of the Payments on an after-tax basis (including all applicable federal, foreign, state, and local income,
employment and other applicable taxes and the Excise Tax) if the Payments were not reduced or eliminated pursuant to Section 6.17(c), then no such reduction shall be made notwithstanding that all or any portion of the Payments may be subject to the
Excise Tax. 
 (e) For purposes of determining which of Section 6.17(c) and Section 6.17(d) shall be given effect, the determination of
which Payments shall be reduced or eliminated to avoid the Excise Tax shall be made by the Independent Tax Advisor, provided that the Independent Tax Advisor shall reduce or eliminate, as the case may be, the Payments in the following order (and
within the category described in each of the following Section 6.17(e)(i) through (iii), in reverse order beginning with the Payments which are to be paid farthest in time except as otherwise provided in Section 6.17(e)(iii)): 

(i) by first reducing or eliminating the portion of the Payments otherwise due which are not payable in cash (other than that
portion of the Payments subject to Section 6.17(e)(iii));

  
 8 

 (ii) then by reducing or eliminating the portion of the Payments otherwise due
and which are payable in cash (other than that portion of the Payments subject to Section 6.17(e)(iii)); 
 (iii) then by
reducing or eliminating the portion of the Payments otherwise due that represent equity-based compensation, such reduction or elimination to be made in reverse chronological order with the most recent equity-based compensation awards reduced first.

 (f) The Independent Tax Advisor shall provide its determinations with respect to a Participant, together with detailed supporting
calculations and documentation, to the Company and such Participant for their review. The determinations of the Independent Tax Advisor under this Section 6.17 shall, after due consideration of the Company’s and such Participant’s comments
with respect to such determinations and the interpretation and application of this Section 6.17, be final and binding on the Company and such Participant absent manifest error. The Company and such Participant shall furnish to the Independent Tax
Advisor such information and documents as the Independent Tax Advisor may reasonably request in order to make the determinations required under this Section 6.17. 

(g) For purposes of this Section 6.17, “Independent Tax Advisor” means a lawyer with a nationally recognized law firm, a
certified public accountant with a nationally recognized accounting firm, or a compensation consultant with a nationally recognized actuarial and benefits consulting firm, in each case with expertise in the area of executive compensation tax law,
who shall be selected by the Company and shall be reasonably acceptable to a Participant (a Participant’s acceptance not to be unreasonably withheld, delayed or conditioned), and all of whose fees and disbursements shall be paid by the Company.

 (h) As used in this Section 6.17, the term “Excise Tax” means, collectively, the excise tax imposed by Code Section
4999, together with any interest thereon, any penalties, additions to tax, or additional amounts with respect to such excise tax, and any interest in respect of such penalties, additions to tax or additional amounts. 

  
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 EXHIBIT A 

DESCRIPTION OF INCENTIVE POOL 
 I. The
amount to be credited to the Incentive Pool shall be determined as follows: 
 A. Upon a Liquidity Event, the Incentive Pool shall be
credited with an amount equal to the LE Participation Amount. The “LE Participation Amount” shall be a portion of the excess of (i) the sum of the net cash proceeds from the event causing the Liquidity Event actually received
by the Company’s direct and indirect equity owners net of transaction costs and expenses (the “LE Cash Received”) plus all prior LE Cash Received (collectively with the current LE Cash Received, the “Aggregate LE Cash
Received”), over (ii) the Beginning Equity Value (such excess, the “LE Profit Amount”). To determine such portion, the Company shall calculate a Cumulative IRR with respect to the Aggregate LE Cash Received, which shall be
determined separately as to each component of LE Cash Received so that the time of payment is taken into account in determining the rate of return. The Incentive Pool shall not be credited unless and until the Cumulative IRR equals or exceeds 15%
but once the Cumulative IRR equals or exceeds 15% then, the LE Participation Amount will be a varying percentage of the tranches of the LE Profit Amount that are required to achieve varying levels of Cumulative IRR, as follows: 

 

			
	
Cumulative IRR Achieved from Aggregate LE Cash Received
	  	Percentage of the Incremental
LE Profit Amount to be
Credited as LE Participation Amount*
	 14.99% or less
	  	0.0%
	 Over 15% up to 16.49%
	  	2.50% of excess over 15%
	 Over 16.5% up to 17.99%
	  	5.50% of excess over 16.5%
	 Over 18% up to 19.99%
	  	7.00% of excess over 18%
	 Over 20% up to 22.99%
	  	8.00% of excess over 20%
	 Over 23% up to 25.99%
	  	9.00% of excess over 23%
	 Over 26% up to 28.99%
	  	9.75% of excess over 26%
	 Over 29% up to 31.99%
	  	10.00% of excess over 29%
	 Over 32% up to 34.99%
	  	10.50% of excess over 32%
	 Over 35% up to 44.99%
	  	12.25% of excess over 35%
	 Over 45%
	  	5.00% of excess over 45%

  

	*	In the chart above, the percentage in the right-hand column in any particular row is applied only to the portion of the LE Profit Amount attributable to the incremental Cumulative IRR reflected in the left-hand column
of such row. 

 Note 1: In the event of a Liquidity Event that is a Public Offering, the LE Cash Received shall be determined in relation to
the market price at which the publicly offered securities are sold by Lone Star Fund IX (U.S.), L.P. and its Affiliates. 

  
 A-1 

 Note 2: For the avoidance of doubt, in the event there is more than one Liquidity Event that results in credits
to the Incentive Pool, the value of the benefit to be paid to a Participant as a result thereof shall be determined as of the date of each Liquidity Event by (a) dividing the number of the Participant’s outstanding Pool Units by the aggregate
number of all outstanding Pool Units, (b) multiplying the quotient obtained in (a) by the applicable LE Participation Amount credited to the Incentive Pool pursuant to the terms hereof, and (c) subtracting from the product obtained in (b) all prior
payments made to the Participant in respect of prior Liquidity Events. 
 II. “Cumulative IRR” means the cumulative internal rate of
return, compounded annually, from the Effective Date to the applicable Liquidity Event determination date in question, as determined by the Administrator, with respect to an investment equal to the Beginning Equity Value, treating each amount of LE
Cash Received as a return on that investment on the date(s) actually received. 
 III. Attached at Exhibit B is an example of calculations of the Incentive
Pool based on assumed hypothetical amounts received in assumed hypothetical Liquidity Events. The example is for illustrative purposes only and all calculations of the Incentive Pool shall be governed by the foregoing provisions of this Exhibit
A.  

  
 A-2 

 Exhibit B 

Illustrative Incentive Pool Funding with $432,379,051.89 Beginning 

Equity Value; Aggregate Return Based on 3-Year Cumulative IRR. 

Assumes Year 3 Liquidity Event 
  

																	
	 	  	 	 	 	Incentive Pool Distribution	 
	 	  	 	 	 	(All Dollar Amounts in Millions)	 
	 	  	 	 	 	Incentive Pool Funding Schedule	 
	 Cumulative IRR, Compounded Over 3 Years
	  	Marginal
Incremental
Funding %	 	 	3-Year Equity
Value at
Maximum
Column A
Marginal
Return %	 	  	Marginal
Incentive Pool
(i.e., Equity Value
above investment)	 	  	Total Pool
Funding	 
	 14.99% or less
	  	 	0.00	% 	 	<$	658	  	  	 	—  	  	  	$	0.0	  
	 15% - 16.49% Annual Return
	  	 	2.50	% 	 	<$	684	  	  	$	6.3	  	  	$	6.3	  
	 16.5% - 17.99% Annual Return
	  	 	5.50	% 	 	<$	710	  	  	$	1.5	  	  	$	7.8	  
	 18% - 19.99% Annual Return
	  	 	7.00	% 	 	<$	747	  	  	$	2.6	  	  	$	10.3	  
	 20% - 22.99% Annual Return
	  	 	8.00	% 	 	<$	805	  	  	$	4.6	  	  	$	14.9	  
	 23% - 25.99% Annual Return
	  	 	9.00	% 	 	<$	865	  	  	$	5.4	  	  	$	20.3	  
	 26% - 28.99% Annual Return
	  	 	9.75	% 	 	<$	928	  	  	$	6.2	  	  	$	26.5	  
	 29% - 31.99% Annual Return
	  	 	10.00	% 	 	<$	994	  	  	$	6.6	  	  	$	33.1	  
	 32% - 34.99% Annual Return
	  	 	10.50	% 	 	<$	1,064	  	  	$	7.3	  	  	$	40.4	  
	 35% - 44.99% Annual Return
	  	 	12.25	% 	 	<$	1,318	  	  	$	31.2	  	  	$	71.6	  
	 45% + Annual Return
	  	 	5.00	% 	 	<$	2,317	  	  	$	50.0	  	  	$	121.5	  

 Note: The above is for illustrative purposes only, and is not a guarantee of actual Incentive Pool payments. 

  
 B-1 

 Exhibit C 

LSF9 CONCRETE HOLDINGS LTD. 

LONG TERM INCENTIVE PLAN

FORM AWARD AGREEMENT 

This AWARD AGREEMENT (this “Agreement”) is made as of
                     (the “Grant Date”), by and between LSF9 Concrete Holdings Ltd., a company incorporated under the laws of the
Bailiwick of Jersey (the “Company”), and                      (“Participant”). 

WHEREAS, the Company maintains the LSF9 Concrete Holdings Ltd. Long Term Incentive Plan (the “Plan”); 

WHEREAS, pursuant to the Plan, the Administrator has determined that Participant is eligible to participate in the Plan; and 

WHEREAS, pursuant to the Plan, the Administrator has approved the grant to Participant of an award of Pool Units pursuant to the Plan, on the
terms and conditions set forth herein. 
 NOW, THEREFORE, in consideration of the foregoing recitals and the covenants set forth herein, the
parties hereto hereby agree as follows: 
  

	1.	Incorporation of Plan. Participant hereby acknowledges that Participant has been provided with a copy of the Plan. The terms and conditions of the Plan, as the same may be amended from time to time, are hereby
incorporated by reference into this Agreement.Should there be any conflict between the terms of this Agreement and the Plan, the terms of this Agreement shall govern. The interpretation and construction by the Administrator of the Plan, this
Agreement, the Award and such rules and regulations as may be adopted by the Administrator for the purpose of administering the Plan shall be final and binding upon Participant. Unless specifically defined herein, each capitalized term used herein
shall have the meaning ascribed to such term in the Plan. 

  

	2.	Grant of Award; Certain Terms and Conditions. The Company hereby grants to Participant, and Participant hereby accepts, as of the date hereof, an award of
                     Pool Units (the “Pool Units”), which Pool Units shall be subject to all of the terms and conditions set forth in the
Plan and this Agreement (the “Award”). 

  

	3.	Forfeiture and Settlement of Pool Units. 

  

	 	(a)	 Forfeiture of Pool Units. Participant shall immediately forfeit all Pool Units upon the earlier to occur
of: (i) the date of Participant’s termination of employment with the Company and its Subsidiaries for any reason; (ii) the date of a Liquidity Event in which Lone Star Fund IX (U.S.), L.P. and its Affiliates have sold, transferred or otherwise
disposed of all of their direct or indirect ownership interests in the Company or a respective successor entity to an unrelated third party for cash, including through an initial or follow-on Public Offering of the

  
 C-1 

	 	
equity interests of the Company or a respective successor entity; or (iii) the date of a Liquidity Event in connection with a sale of all of the assets of the Company or a respective successor
entity (or all of the Subsidiaries of such entity). Notwithstanding any forfeiture of Pool Units as described in this Section 3(a), Participant shall remain entitled to all payments (if any) due to Participant under the Plan and this Agreement in
connection with any Liquidity Event occurring on or prior to the date of such forfeiture of the Pool Units. 

  

	 	(b)	Payment. In the event that a Liquidity Event occurs that results in amounts being credited to the Incentive Pool, Participant shall be entitled to payment in respect of his then outstanding Pool Units in
accordance with the terms and conditions of this Agreement and Section 5 of the Plan. 

  

	4.	Binding Arbitration. 

  

	 	(a)	Generally. Participant and the Company agree that any controversy or claim arising out of or relating to this Agreement, the employment relationship between Participant and the Company or any of its Subsidiaries,
or the termination thereof, including the arbitrability of any controversy or claim, which cannot be settled by mutual agreement will be finally settled by binding arbitration in accordance with the Expedited Arbitration Procedures of Judicial
Arbitration & Mediation Service, Inc. (“JAMS”), as set forth in Section 16.1 et seq. of the JAMS rules, or any successor provision thereto, as follows: Any party aggrieved will deliver a notice to the other party setting forth the
specific points in dispute. Any points remaining in dispute twenty (20) days after the giving of such notice may, upon ten (10) days’ notice to the other party, be submitted to JAMS arbitration conducted before a single neutral arbitrator in
Dallas, Texas. The arbitrator shall be appointed by agreement of the parties hereto or, if no agreement can be reached, by JAMS. The arbitrator may enter a default decision against any party who fails to participate in the arbitration proceedings.
Notwithstanding the foregoing, a party who seeks equitable relief, including injunctive relief, shall not be obligated to utilize the arbitration proceedings required hereunder and instead may seek such relief in any state or federal court sitting
in Dallas, Texas. 

  

	 	(b)	Binding Effect. The decision of the arbitrator on the points in dispute will be final, unappealable and binding, and judgment on the award may be entered in any court having jurisdiction thereof. The arbitrator
shall only be authorized to interpret the provisions of this Agreement, and shall not amend, change or add to any such provisions. The parties agree that this provision has been adopted by the parties to rapidly and inexpensively resolve any
disputes between them and that this provision will be grounds for dismissal of any court action commenced by either party with respect to this Agreement, other than post-arbitration actions seeking to enforce an arbitration award or proceedings
seeking equitable relief as permitted under Section 4(a). In the event that any court determines that this arbitration procedure is not binding, or otherwise allows any litigation regarding a dispute, claim, or controversy covered by this Agreement
to proceed, the partieshereto hereby waive any and all right to a trial by jury in or with respect to such litigation. 

  
 C-2 

	 	(c)	Fees and Expenses. Except as otherwise provided in this Agreement, the Plan or by applicable law, the arbitrator will be authorized to apportion its fees and expenses as the arbitrator deems appropriate and the
arbitrator will be authorized to award the prevailing party its fees and expenses (including attorneys’ fees). In the absence of any such apportionment or award, each party will bear its own expenses and the fees of its own attorney.

  

	 	(d)	Confidentiality. The parties and the arbitrator will keep confidential, and will not disclose to any person, except the parties’ advisors and legal representatives, or as may be required by law, the
existence of any controversy under this Section 4, the referral of any such controversy to arbitration or the status or resolution thereof. 

  

	 	(e)	Waiver. Participant acknowledges that arbitration pursuant to this Agreement includes all controversies or claims of any kind (e.g., whether in contract or in tort, statutory or common law, legal or equitable)
now existing or hereafter arising under any federal, state, local or foreign law, including, but not limited to, the Age Discrimination in Employment Act, Title VII of the Civil Rights Act of 1964, the Civil Rights Act of 1866, the Employee
Retirement Income Security Act, the Family and Medical Leave Act, the Americans With Disabilities Act and all similar federal, state and local laws, and Participant hereby waives all rights thereunder to have a judicial tribunal and/or a jury
determine such claims. 

  

	 	(f)	Acknowledgment. Participant acknowledges that before agreeing to participate in this Agreement, Participant has had the opportunity to consult with any attorney or other advisor of Participant’s choice, and
that this provision constitutes advice from the Company to do so if Participant chooses. Participant further acknowledges that Participant has agreed to participate in this Agreement of Participant’s own free will, and that no promises or
representations have been made to Participant by any person to induce Participant to participate in this Agreement other than the express terms set forth herein. Participant further acknowledges that Participant has read this Agreement and
understands all of its terms, including the waiver of rights set forth in this Section 4. 

  

	5.	No Guarantee of Employment. Nothing in this Agreement or the Plan shall confer upon Participant any right to continue in the employ of the Company or any Subsidiary or interfere in any way with the right of the
Company or a Subsidiary to terminate Participant’s employment at any time and for any reason. 

  

	6.	Pool Unit Not Salary. Neither the grant of Pool Units nor any payment to be made with respect thereto shall be deemed salary or other compensation or remuneration to Participant for the purpose of computing other
benefits to which Participant may be entitled under any severance arrangement, retirement plan, employment agreement or other similar compensation or remuneration scheme or arrangement that the Company or any Subsidiary may now or hereafter have or
adopt. 

  
 C-3 

	7.	Amendment and Cancellation. The Administrator may amend the terms of this Agreement or the Plan, but no such amendment shall materially reduce the aggregate amount reasonably expected to be paid to a Participant
under the Plan without the prior written consent of Participant. The Administrator may, with a Participant’s written consent, cancel this Agreement in exchange for a new award under the Plan. 

 

	8.	Withholding Taxes. The Company or an Affiliate shall have the right to require Participant to remit to the Company or such Affiliate, or to withhold from other amounts payable to Participant, as compensation or
otherwise, any amount required to satisfy all federal, state and local income and employment tax withholding and any social security or national insurance contribution requirements. 

 

	9.	Notices. All notices and other communications under this Agreement and the Plan shall be in writing (including electronically) and shall be given in person or by either personal delivery, personal email with
return receipt requested, facsimile with confirmation of receipt, overnight delivery, or first class mail, certified or registered with return receipt requested, with postal or delivery charges prepaid, and shall be deemed to have been duly given
when delivered personally, emailed, or three days after mailing first class, certified or registered with return receipt requested. 

  

	10.	Entire Agreement. This Agreement and the Plan supersede any and all other agreements either oral or written, between the parties hereto with respect to the subject matter hereof. 

 

	11.	Severability and Waiver. If any provision contained in this Agreement shall be held to be invalid, illegal or unenforceable under present or future laws effective during the term hereof, such provision shall be
fully severable; this Agreement shall be construed and enforced as if such illegal, invalid, or unenforceable provision had never comprised a part hereof; and the remaining provisions hereof shall remain in full force and effect and shall not be
affected by the illegal, invalid, or unenforceable provision or by its severance herefrom. Furthermore, in lieu of such illegal, invalid, or unenforceable provision, there shall be added automatically by the parties as a part hereof a provision as
similar in terms to such illegal, invalid or unenforceable provision as may be possible and be legal, valid and enforceable, and the parties hereby agree to such provision. Waiver by any party of any breach of this Agreement or failure to exercise
any right hereunder shall not be deemed to be a waiver of any other breach or right. The failure of any party to take action by reason of such breach or to exercise any such right shall not deprive the party of the right to take action at any time
while or after such breach or condition giving rise to such rights continues. 

  

	12.	Binding Effect. This Agreement shall be binding upon and inure to the benefit of (i) Participant and Participant’s executors, administrators, personal representatives and heirs, and (ii) the Company, its
successors and assigns. 

  

	13.	Headings and Interpretation. Headings are for convenience only and are not deemed to be part of this Agreement. Unless otherwise indicated, any reference to a Section herein is a reference to a Section of this
Agreement. 

  
 C-4 

	14.	No Guarantee of Tax Consequences. No person connected with this Agreement in any capacity, including, but not limited to, the Company or any Subsidiary and their respective members, partners, directors, officers,
agents and employees, makes any representation, commitment or guarantee that any tax treatment, including, but not limited to, federal, state and local income, estate and gift tax treatment, will be applicable with respect to any award granted to or
for the benefit of Participant or that such tax treatment will apply to or be available to Participant. Participant should consult with Participant’s own tax advisor to determine the tax consequences to Participant that are associated with
participating in the Agreement. 

  

	15.	Participant Acknowledgments. Participant acknowledges by accepting this Agreement and the Award that Participant has reviewed this Agreement and the Plan and agrees to be bound by the terms and provisions hereof
and thereof. Participant further acknowledges that Participant has been advised to consult with Participant’s own attorney, financial advisor and tax advisor concerning the legal, financial and tax matters associated with participating in this
Agreement and the Plan. 

  

	16.	Governing Law. This Agreement shall be construed in accordance with and governed in all respects by the laws of the State of Texas. 

 

	17.	Assignment. This Agreement is not assignable by any Participant without the prior written consent of the Company, and any attempted assignment without such consent shall be void ab initio. No right or
interest of Participant under this Agreement and/or the Plan may be assigned, transferred or alienated, in whole or in part, either directly or by operation of law, and no such right or interest shall be liable for or subject to any debt, obligation
or liability of Participant. 

  

	18.	Compliance With Code Section 409A. The compensation payable to or with respect to any Participant pursuant to this Agreement is intended to be compensation that is not subject to the tax imposed by Internal
Revenue Code Section 409A, and this Agreement shall be administered and construed to the fullest extent possible to reflect and implement such intent. 

[signature page follows] 

  
 C-5 

 IN WITNESS WHEREOF, the Company has executed this Agreement as of the day and year first above
written. 
  

			
	LSF9 CONCRETE HOLDINGS LTD.
		
	By:	 	  

	Name:	 	  

	Title:	 	  

	
	PARTICIPANT:
	
	  

  
 C-6EX-10.1

 Exhibit 10.1 

MITEL NETWORKS CORPORATION 

350 Legget Drive 
 Kanata, Ontario

 Canada K2K 2W7 
 July 7,
2016 
 BY EMAIL 
 Polycom, Inc. 

6001 America Center Drive 
 San Jose, California 95002 

Attention: Sayed M. Darwish 
 Ladies and Gentlemen: 

Reference is made to that certain Agreement and Plan of Merger, dated as of April 15, 2016 and as thereafter amended (the “Merger
Agreement”), by and among Polycom, Inc. (the “Company”), Mitel Networks Corporation (“Parent”) and Meteor Two, LLC. Further reference is made to the letter from the Company to Parent, dated July 7, 2016,
regarding the Company Acquisition Proposal received from Siris Capital Group, LLC, which the Company Board has determined is a Company Superior Proposal. Capitalized terms used but not otherwise defined herein have the respective meanings ascribed
thereto in the Merger Agreement. 
 Parent hereby waives the “matching period” set forth in Section 5.02(b) of the Merger
Agreement. Please indicate that the Company will terminate the Merger Agreement pursuant to Section 9.0l(h) thereof (the “Termination”) by returning a signed copy of this letter and paying the Company Termination Fee in immediately
available funds to Parent’s account set forth on Annex A hereto. The Termination shall be automatically effective upon receipt by Parent of the Company Termination Fee. 

[Signature page follows] 

 Please indicate your acceptance and agreement of the foregoing by signing where indicated below
and returning a signed copy of this letter to Mitel pursuant to Section 10.05 of the Merger Agreement. 
  

			
	Very truly yours,
	
	MITEL NETWORKS CORPORATION
		
	By:	 	/s/ Greg Hiscock
		 	  

		 	Greg Hiscock
		 	Vice President, General Counsel &
		 	Corporate Secretary

  

					
	Accepted and Agreed as of the date first written above:
	
	POLYCOM, INC.
		
	By:	 	/s/ Laura J. Durr
		 	  

		 	Name:	 	Laura J. Durr
		 	Title:	 	 Chief Financial Officer &
 Executive Vice
President

  

			
	cc:	 	Wilson Sonsini Goodrich & Rosati, P.C.
		 	One Market Plaza
		 	Spear Tower, Suite 3300
		 	San Francisco, CA 94105
		 	Attention: Michael S. Ringler
		 	Email: mringler@wsgr.com
		
		 	Morrison & Foerster LLP
		 	425 Market Street
		 	San Francisco, CA 94105
		 	Attention: Robert S. Townsend
		 	Email: rtownsend@mofo.com
		
		 	Paul, Weiss, Rifkind, Wharton & Garrison LLP
		 	1285 Avenue of the Americas
		 	New York, NY 10019
		 	Attention: Adam M. Givertz
		 	Email: agivertz@paulweiss.com

  
 2

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