Document:

EX-10.6

 Exhibit 10.6 

SUMMIT MATERIALS, INC. 

2015 OMNIBUS INCENTIVE PLAN 

1. Purpose. The purpose of the Summit Materials, Inc. 2014 Omnibus Incentive Plan is to provide a means through which the
Company and its Affiliates may attract and retain key personnel and to provide a means whereby directors, officers, employees, consultants and advisors (and prospective directors, officers, employees, consultants and advisors) of the Company and its
Affiliates can acquire and maintain an equity interest in the Company, or be paid incentive compensation, including incentive compensation measured by reference to the value of Common Stock, thereby strengthening their commitment to the welfare of
the Company and its Affiliates and aligning their interests with those of the Company’s stockholders. 
 2. Definitions.
The following definitions shall be applicable throughout the Plan. 
 (a) “Absolute Share Limit” has the meaning given such
term in Section 5(b) of the Plan. 
 (b) “Affiliate” means (i) any Person or entity that directly or indirectly
controls, is controlled by or is under common control with the Company and/or (ii) to the extent provided by the Committee, any person or entity in which the Company has a significant interest. 

(c) “Award” means, individually or collectively, any Incentive Stock Option, Nonqualified Stock Option, Stock Appreciation
Right, Restricted Stock, Restricted Stock Unit, Other Stock-Based Award, OP Units and Performance Compensation Award granted under the Plan. 

(d) “Board” means the Board of Directors of the Company. 

(e) “Cause” means, in the case of a particular Award, unless the applicable Award agreement states otherwise, a good faith
determination of the Committee or its designee that (i) the Company or an Affiliate has “cause” to terminate a Participant’s employment or service, as defined in any employment or consulting agreement between the Participant and
the Company or an Affiliate in effect at the time of such termination or (ii) in the absence of any such employment or consulting agreement (or the absence of any definition of “Cause” contained therein), any of the following has
occurred with respect to a Participant: (A) such Participant has failed to reasonably perform his or her duties to the Service Recipient, or has failed to follow the lawful instructions of the Board or his or her direct superiors, in each case
other than as a result of his or her incapacity due to physical or mental illness or injury, in a manner that could reasonably be expected to result in harm (whether financially, reputationally or otherwise) to the Company or an Affiliate, following
notice by the Company of such failure, (B) such Participant has engaged or is about to engage in conduct harmful (whether financially, reputationally or otherwise) to the Company or an Affiliate, (C) such Participant has been convicted of,
or pled guilty or no contest to, a felony or any crime involving as a material element fraud or dishonesty, (D) the willful misconduct or gross neglect of such Participant that could reasonably be expected to result in harm (whether
financially, reputationally or otherwise) to the Company or an Affiliate, (E) the willful violation by such Participant of the Company’s written policies that could reasonably be expected to result in harm (whether financially,

 
reputationally or otherwise) to the Company or an Affiliate; (F) such Participant’s fraud or misappropriation, embezzlement or misuse of funds or property belonging to the Company or an
Affiliate (other than good faith expense account disputes); (G) such Participant’s act of personal dishonesty which involves personal profit in connection with such Participant’s employment or service with the Company or an Affiliate,
or (H) the willful breach by such Participant of fiduciary duty owed to the Company or an Affiliate. 
 (f) “Change in
Control” means: 
 (i) the acquisition (whether by purchase, merger, consolidation, combination or other similar
transaction) by any Person of beneficial ownership (within the meaning of Rule 13d-3 promulgated under the Exchange Act) of more than 50% (on a fully diluted basis) of either (A) the then outstanding shares of Common Stock, taking into account
as outstanding for this purpose such Common Stock issuable upon the exercise of options or warrants, the conversion of convertible stock or debt, the exchange of exchangeable stock or units, and the exercise of any similar right to acquire such
Common Stock, treating, for the avoidance of doubt, all then-outstanding OP Units as shares of Common Stock assuming the full exchange of then-outstanding OP Units for shares of Common Stock in accordance with the Exchange Agreement (the
“Outstanding Company Common Stock”) or (B) the combined voting power of the then outstanding voting securities of the Company entitled to vote generally in the election of directors (the “Outstanding Company Voting
Securities”); provided, however, that for purposes of this Plan, the following acquisitions shall not constitute a Change in Control: (I) any acquisition by the Company or any Affiliate, (II) any acquisition by any
employee benefit plan sponsored or maintained by the Company or any Affiliate, or (III) in respect of an Award held by a particular Participant, any acquisition by the Participant or any group of Persons including the Participant (or any entity
controlled by the Participant or any group of Persons including the Participant); 
 (ii) during any period of 24 months,
individuals who, at the beginning of such period, constitute the Board (the “Incumbent Directors”) cease for any reason to constitute at least a majority of the Board, provided that any person becoming a director subsequent to the
date hereof, whose election or nomination for election was approved by a vote of at least two-thirds of the Incumbent Directors then on the Board (either by a specific vote or by approval of the proxy statement of the Company in which such person is
named as a nominee for director, without written objection to such nomination) shall be an Incumbent Director; provided, however, that no individual initially elected or nominated as a director of the Company as a result of an actual or
threatened election contest, as such terms are used in Rule 14a-12 of Regulation 14A promulgated under the Exchange Act, with respect to directors or as a result of any other actual or threatened solicitation of proxies or consents by or on behalf
of any person other than the Board shall be deemed to be an Incumbent Director; 
 (iii) the sale, transfer or other
disposition of all or substantially all of the business or assets of the Company and its Subsidiaries, taken as a whole; or 

  
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 (iv) the consummation of a reorganization, recapitalization, merger,
consolidation, or other similar transaction involving the Company (a “Business Combination”), unless immediately following such Business Combination 50% or more of the total voting power of the entity resulting from such Business
Combination (or, if applicable, the ultimate parent entity that directly or indirectly has beneficial ownership of sufficient voting securities eligible to elect a majority of the board of directors (or the analogous governing body) of such
resulting entity), is held by the holders of the Outstanding Company Voting Securities immediately prior to such Business Combination. 
 Notwithstanding the
foregoing, no transaction or series of events shall constitute a “Change in Control” if The Blackstone Group L.P. and/or its Affiliates directly or indirectly control the Company (including through a group (within the meaning of
Section 13(d)(3) or 14(d)(2) of the Exchange Act) of which The Blackstone Group L.P. and/or its Affiliates is a member). 
 (g)
“Code” means the Internal Revenue Code of 1986, as amended, and any successor thereto. Reference in the Plan to any section of the Code shall be deemed to include any regulations or other interpretative guidance under such section,
and any amendments or successor provisions to such section, regulations or guidance. 
 (h) “Committee” means the
Compensation Committee of the Board or subcommittee thereof (including without limitation any subcommittee used to comply with Section 162(m) of the Code in respect of Awards) or, if no such Compensation Committee or subcommittee thereof
exists, the Board. 
 (i) “Common Stock” means the Class A common stock, par value $0.01 per share, of the Company
(and any stock or other securities into which such Common Stock may be converted or into which it may be exchanged). 
 (j)
“Company” means Summit Materials, Inc., a Delaware corporation and any successor thereto. 
 (k) “Control”
(including, with correlative meaning, the terms “controlled by” and “under common control with”), as applied to any Person or entity, means the possession, directly or indirectly, of the power to direct or cause the direction of
the management and policies of such person or entity, whether through the ownership of voting or other securities, by contract or otherwise. 

(l) “Date of Grant” means the date on which the granting of an Award is authorized, or such other date as may be specified in
such authorization. 
 (m) “Detrimental Activity” means a good faith determination by the Committee or its designee that a
Participant has engaged in any of the following: (i) the breach of any covenants relating to disclosure of confidential or proprietary information, noncompetition, nonsolicitation, non-disparagement or other similar restrictions on conduct
contained in any agreement between a Participant and the Company or its Affiliates (including any Award Agreement) or any written policies of the Company or its Affiliates (including those contained in any handbook); or (ii) any activity,
including fraud or other conduct contributing to financial 

  
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restatement or accounting irregularities, that the Committee determines in good faith is appropriate to include in any incentive compensation clawback policy adopted by the Committee and as in
effect from time to time. 
 (n) “Designated Foreign Subsidiaries” means all Affiliates organized under the laws of any
jurisdiction or country other than the United States of America that may be designated by the Board or the Committee from time to time. 

(o) “Disability” means, unless in the case of a particular Award the applicable Award agreement states otherwise, the Company
or an Affiliate having cause to terminate a Participant’s employment or service on account of “disability,” as defined in any then-existing employment, consulting or other similar agreement between the Participant and the Company or
an Affiliate or, in the absence of such an employment, consulting or other similar agreement, a condition entitling the Participant to receive benefits under a long-term disability plan of the Company or an Affiliate, or, in the absence of such a
plan, the complete and permanent inability by reason of illness or accident to perform the duties of the occupation at which a Participant was employed or served when such disability commenced. Any determination of whether Disability exists shall be
made by the Committee in its sole discretion. 
 (p) “Effective Date” means the date the Company’s stockholders
approve the Plan. 
 (q) “Eligible Person” means any (i) individual employed by the Company or an Affiliate;
provided, however, that no such employee covered by a collective bargaining agreement shall be an Eligible Person unless and to the extent that such eligibility is set forth in such collective bargaining agreement or in an agreement or
instrument relating thereto; (ii) director or officer of the Company or an Affiliate; (iii) consultant or advisor to the Company or an Affiliate who may be offered securities registrable pursuant to a registration statement on Form S-8
under the Securities Act; or (iv) any prospective employees, directors, officers, consultants or advisors who have accepted offers of employment or consultancy from the Company or its Affiliates (and would satisfy the provisions of clauses
(i) through (iii) above once he or she begins employment with or providing services to the Company or its Affiliates), who, in the case of each of clauses (i) through (iv) above has entered into an Award agreement or who has
received written notification from the Committee or its designee that they have been selected to participate in the Plan. Solely for purposes of this Section 2(q), “Affiliate” shall be limited to (1) a Subsidiary, (2) any
parent corporation of the Company within the meaning of Section 424(e) of the Code (“Parent”), (3) any corporation, trade or business 50% or more of the combined voting power of such entity’s outstanding securities is
directly or indirectly controlled by the Company or any Subsidiary or Parent, (4) any corporation, trade or business which directly or indirectly controls 50% or more of the combined voting power of the outstanding securities of the Company and
(5) any other entity in which the Company or any Subsidiary or Parent has a material equity interest and which is designated as an “Affiliate” by the Committee. 

(r) “Employment” or “employment” means, without any inference for federal and other tax purposes, service as a
part- or full-time officers, employees, consultants and advisors or Board member of or to the Company or any of its Subsidiaries. 

  
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 (s) “Exchange Act” means the Securities Exchange Act of 1934, as amended, and
any successor thereto. Reference in the Plan to any section of (or rule promulgated under) the Exchange Act shall be deemed to include any rules, regulations or other interpretative guidance under such section or rule, and any amendments or
successor provisions to such section, rules, regulations or guidance. 
 (t) “Exchange Agreement” means the Exchange
Agreement, dated as of or about the date of the closing of the initial public offering of the Company among the Company, the Operating Partnership and holders of OP Units from time to time party thereto, as amended from time to time. 

(u) “Exercise Price” has the meaning given such term in Section 7(b) of the Plan. 

(v) “Fair Market Value” means, on a given date, if (i) the Common Stock is listed on a national securities exchange, the
closing sales price of the Common Stock reported on the primary exchange on which the Common Stock is listed and traded on such date, or, if there are no such sales on that date, then on the last preceding date on which such sales were reported;
(ii) the Common Stock is not listed on any national securities exchange but is quoted in an inter-dealer quotation system on a last sale basis, the average between the closing bid price and ask price reported on such date, or, if there is no
such sale on that date, then on the last preceding date on which a sale was reported; or (iii) the Common Stock is not listed on a national securities exchange or quoted in an inter-dealer quotation system on a last sale basis, the amount
determined by the Committee in good faith to be the fair market value of the Common Stock; provided, however, as to any Awards granted on or with a Date of Grant of the date of the pricing of the Company’s initial public offering,
“Fair Market Value” shall be equal to the per share price the Common Stock is offered to the public in connection with such initial public offering. 

(w) “Immediate Family Members” has the meaning given such term in Section 15(b) of the Plan. 

(x) “Incentive Stock Option” means an Option which is designated by the Committee as an incentive stock option as described
in Section 422 of the Code and otherwise meets the requirements set forth in the Plan. 
 (y) “Indemnifiable Person”
has the meaning given such term in Section 4(e) of the Plan. 
 (z) “Negative Discretion” means the discretion
authorized by the Plan to be applied by the Committee to eliminate or reduce the size of a Performance Compensation Award consistent with Section 162(m) of the Code. 

(aa) “Nonqualified Stock Option” means an Option which is not designated by the Committee as an Incentive Stock Option. 

(bb) “Non-Employee Director” means a member of the Board who is not an employee of the Company or any Affiliate. 

  
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 (cc) “NYSE” means the New York Stock Exchange. 

(dd) “OP Unit” means an Award granted under Section 10(a) of the Plan. 

(ee) “Operating Partnership” has the meaning given such term in Section 10(a) of the Plan. 

(ff) “Option” means an Award granted under Section 7 of the Plan. 

(gg) “Option Period” has the meaning given such term in Section 7(c) of the Plan. 

(hh) “Other Cash-Based Award” means an Award granted under Section 10 of the Plan that is payable without reference to
the value of the Common Stock. 
 (ii) “Other Stock-Based Award” means an Award granted under Section 11 of the Plan.

 (jj) “Participant” means an Eligible Person who has been selected by the Committee to participate in the Plan and to
receive an Award pursuant to the Plan. 
 (kk) “Performance Compensation Award” means any Award designated by the Committee
as a Performance Compensation Award pursuant to Section 12 of the Plan. 
 (ll) “Performance Criteria” means the
criterion or criteria that the Committee shall select for purposes of establishing the Performance Goals for a Performance Period with respect to any Performance Compensation Award under the Plan. 

(mm) “Performance Formula” means, for a Performance Period, the one or more objective formulae applied against the relevant
Performance Goal to determine, with regard to the Performance Compensation Award of a particular Participant, whether all, some portion but less than all, or none of the Performance Compensation Award has been earned for the Performance Period. 

(nn) “Performance Goals” means, for a Performance Period, the one or more goals established by the Committee for the
Performance Period based upon the Performance Criteria. 
 (oo) “Performance Period” means the one or more periods of time
of not less than 12 months, as the Committee may select, over which the attainment of one or more Performance Goals will be measured for the purpose of determining a Participant’s right to, and the payment of, a Performance Compensation Award.

 (pp) “Permitted Transferee” has the meaning given such term in Section 15(b) of the Plan. 

(qq) “Person” means any individual, entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange
Act or any successor provision). 

  
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 (rr) “Plan” means this Summit Materials, Inc. 2014 Omnibus Incentive Plan, as it
may be amended from time to time. 
 (ss) “Restricted Period” means the period of time determined by the Committee during
which an Award is subject to restrictions or, as applicable, the period of time within which performance is measured for purposes of determining whether an Award has been earned. 

(tt) “Restricted Stock” means Common Stock, subject to certain specified restrictions (which may include, without limitation,
a requirement that the Participant remain continuously employed or provide continuous services for a specified period of time), granted under Section 9 of the Plan. 

(uu) “Restricted Stock Unit” means an unfunded and unsecured promise to deliver shares of Common Stock, cash, other
securities or other property, subject to certain restrictions (which may include, without limitation, a requirement that the Participant remain continuously employed or provide continuous services for a specified period of time), granted under
Section 9 of the Plan. 
 (vv) “SAR Period” has the meaning given such term in Section 8(c) of the Plan. 

(ww) “Securities Act” means the Securities Act of 1933, as amended, and any successor thereto. Reference in the Plan to any
section of (or rule promulgated under) the Securities Act shall be deemed to include any rules, regulations or other interpretative guidance under such section or rule, and any amendments or successor provisions to such section, rules, regulations
or guidance. 
 (xx) “Service Recipient” means, with respect to a Participant holding a given Award, either the Company or
an Affiliate of the Company by which the original recipient of such Award is, or following a Termination was most recently, principally employed or to which such original recipient provides, or following a Termination was most recently providing,
services, as applicable. 
 (yy) “Special Qualifying Director” means a person who is (i) with respect to actions
intended to obtain an exemption from Section 16(b) of the Exchange Act pursuant to Rule 16b-3 under the Exchange Act, a “non-employee director” within the meaning of Rule 16b-3 under the Exchange Act; (ii) with respect to actions
intended to obtain the exception for performance-based compensation under 162(m) of the Code, an “outside director” within the meaning of Section 162(m) of the Code; and (iii) with respect to actions undertaken to comply with the
rules of the NYSE or any other securities exchange or inter-dealer quotation system on which the Common Stock is listed or quoted, an “independent director” under the rules of the NYSE or any other securities exchange or inter-dealer
quotation system on which the Common Stock is listed or quoted, or a person meeting any similar requirement under any successor rule or regulation. 

(zz) “Stock Appreciation Right” or “SAR” means an Award granted under Section 8 of the Plan. 

  
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 (aaa) “Strike Price” has the meaning given such term in Section 8(b) of the
Plan. 
 (bbb) “Subsidiary” means, with respect to any specified Person: 

(i) any corporation, association or other business entity of which more than 50% of the total voting power of shares of such
entity’s voting securities (without regard to the occurrence of any contingency and after giving effect to any voting agreement or stockholders’ agreement that effectively transfers voting power) 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); and 

(ii) any partnership (or any comparable foreign entity) (A) the sole general partner (or functional equivalent thereof) or
the managing general partner of which is such Person or Subsidiary of such Person or (B) the only general partners (or functional equivalents thereof) of which are that Person or one or more Subsidiaries of that Person (or any combination
thereof). 
 (ccc) “Substitute Award” has the meaning given such term in Section 5(e) of the Plan. 

(ddd) “Sub Plans” means, any sub-plan to this Plan that has been adopted by the Board or the Committee for the purpose of
permitting the offering of Awards to employees of certain Designated Foreign Subsidiaries or otherwise outside the United States of America, with each such sub-plan designed to comply with local laws applicable to offerings in such foreign
jurisdictions. Although any Sub Plan may be designated a separate and independent plan from the Plan in order to comply with applicable local laws, the Absolute Share Limit shall apply in the aggregate to the Plan and any Sub Plan adopted hereunder.

 (eee) “Termination” means the termination of a Participant’s employment or service, as applicable, with the Service
Recipient, for any reason (including death or Disability). 
 3. Effective Date; Duration. The Plan shall be effective as of the
Effective Date. The expiration date of the Plan, on and after which date no Awards may be granted hereunder, shall be the tenth anniversary of the Effective Date; provided, however, that such expiration shall not affect Awards then
outstanding, and the terms and conditions of the Plan shall continue to apply to such Awards. 
 4. Administration. 

(a) The Committee shall administer the Plan. To the extent required to comply with the provisions of Rule 16b-3 promulgated under the Exchange
Act (if the Board is not acting as the Committee under the Plan) or necessary to obtain the exception for performance-based compensation under Section 162(m) of the Code, as applicable, it is intended that each member of the Committee shall, at
the time he or she takes any action with respect to an Award under the Plan that is subject to Rule 16b-3 or Section 162(m) of the Code, as applicable, be a Special Qualifying Director. However, the fact that a Committee member shall fail to
qualify as a Special Qualifying Director shall not invalidate any Award granted by the Committee that is otherwise validly granted under the Plan. 

  
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 (b) Subject to the provisions of the Plan and applicable law, the Committee shall have the sole
and plenary authority, in addition to other express powers and authorizations conferred on the Committee by the Plan, to: (i) designate Participants; (ii) determine the type or types of Awards to be granted to a Participant;
(iii) determine the number of shares of Common Stock to be covered by, or with respect to which payments, rights, or other matters are to be calculated in connection with, Awards; (iv) determine the terms and conditions of any Award;
(v) determine whether, to what extent, and under what circumstances Awards may be settled or exercised in cash, shares of Common Stock or OP Units, as applicable, other securities, other Awards or other property, or canceled, forfeited, or
suspended and the method or methods by which Awards may be settled, exercised, canceled, forfeited, or suspended; (vi) determine whether, to what extent, and under what circumstances the delivery of cash, shares of Common Stock, other
securities, other Awards or other property and other amounts payable with respect to an Award shall be deferred either automatically or at the election of the Participant or of the Committee; (vii) interpret, administer, reconcile any
inconsistency in, correct any defect in and/or supply any omission in the Plan and any instrument or agreement relating to, or Award granted under, the Plan; (viii) establish, amend, suspend, or waive any rules and regulations and appoint such
agents as the Committee shall deem appropriate for the proper administration of the Plan; and (ix) make any other determination and take any other action that the Committee deems necessary or desirable for the administration of the Plan. 

(c) Except to the extent prohibited by applicable law or the applicable rules and regulations of any securities exchange or inter-dealer
quotation system on which the securities of the Company are listed or traded, the Committee may allocate all or any portion of its responsibilities and powers to any one or more of its members and may delegate all or any part of its responsibilities
and powers to any person or persons selected by it. Any such allocation or delegation may be revoked by the Committee at any time. Without limiting the generality of the foregoing, the Committee may delegate to one or more officers of the Company or
any Subsidiary the authority to act on behalf of the Committee with respect to any matter, right, obligation, or election which is the responsibility of or which is allocated to the Committee herein, and which may be so delegated as a matter of law,
except for grants of Awards to persons (i) who are members of the Board, (ii) who are subject to Section 16 of the Exchange Act or (iii) who are, or who are reasonably expected to be, “covered employees” for purposes of
Section 162(m) of the Code. 
 (d) Unless otherwise expressly provided in the Plan, all designations, determinations, interpretations,
and other decisions under or with respect to the Plan or any Award or any documents evidencing Awards granted pursuant to the Plan shall be within the sole discretion of the Committee, may be made at any time and shall be final, conclusive and
binding upon all persons or entities, including, without limitation, the Company, any Affiliate, any Participant, any holder or beneficiary of any Award, and any stockholder of the Company. 

(e) No member of the Board, the Committee or any employee or agent of the Company or any Subsidiary (each such person, an
“Indemnifiable Person”) shall be liable for any action taken or omitted to be taken or any determination made with respect to the Plan or any Award hereunder (unless constituting fraud or a willful criminal act or omission). Each
Indemnifiable Person shall be indemnified and held harmless by the Company against and from any loss, cost, liability, or expense (including attorneys’ fees) that may be imposed upon or 

  
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incurred by such Indemnifiable Person in connection with or resulting from any action, suit or proceeding to which such Indemnifiable Person may be a party or in which such Indemnifiable Person
may be involved by reason of any action taken or omitted to be taken or determination made under the Plan or any Award agreement and against and from any and all amounts paid by such Indemnifiable Person with the Company’s approval, in
settlement thereof, or paid by such Indemnifiable Person in satisfaction of any judgment in any such action, suit or proceeding against such Indemnifiable Person, and the Company shall advance to such Indemnifiable Person any such expenses promptly
upon written request (which request shall include an undertaking by the Indemnifiable Person to repay the amount of such advance if it shall ultimately be determined as provided below that the Indemnifiable Person is not entitled to be indemnified);
provided that the Company shall have the right, at its own expense, to assume and defend any such action, suit or proceeding and once the Company gives notice of its intent to assume the defense, the Company shall have sole control over such
defense with counsel of the Company’s choice. The foregoing right of indemnification shall not be available to an Indemnifiable Person to the extent that a final judgment or other final adjudication (in either case not subject to further
appeal) binding upon such Indemnifiable Person determines that the acts or omissions or determinations of such Indemnifiable Person giving rise to the indemnification claim resulted from such Indemnifiable Person’s fraud or willful criminal act
or omission or that such right of indemnification is otherwise prohibited by law or by the Company’s or any Subsidiary’s organizational documents. The foregoing right of indemnification shall not be exclusive of or otherwise supersede any
other rights of indemnification to which such Indemnifiable Persons may be entitled under the Company’s Certificate of Incorporation or Bylaws, as a matter of law, individual indemnification agreement or contract or otherwise, or any other
power that the Company may have to indemnify such Indemnifiable Persons or hold them harmless. 
 (f) Notwithstanding anything to the
contrary contained in the Plan, the Board may, in its sole discretion, at any time and from time to time, grant Awards and administer the Plan with respect to such Awards. Any such actions by the Board shall be subject to the applicable rules of the
NYSE or any other securities exchange or inter-dealer quotation system on which the Common Stock is listed or quoted. In any such case, the Board shall have all the authority granted to the Committee under the Plan. 

5. Grant of Awards; Shares Subject to the Plan; Limitations. 

(a) The Committee may, from time to time, grant Awards to one or more Eligible Persons. 

(b) Awards granted under the Plan shall be subject to the following limitations: (i) subject to Section 13 of the Plan, no more than
[                ] shares of Common Stock (the “Absolute Share Limit”) shall be available for Awards under the Plan (excluding those shares of
Restricted Stock received by Participants in exchange for (or redemption of) partnership or limited liability interests contemporaneous with the adoption of the Plan); (ii) subject to Section 13 of the Plan, grants of Options or SARs under
the Plan in respect of no more than [                ] shares of Common Stock may be made to any individual Participant during any single fiscal year of the Company (for
this purpose, if a SAR is granted in tandem with an Option (such that the SAR expires with respect to the number of shares of Common Stock for 

  
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which the Option is exercised), only the shares underlying the Option shall count against this limitation); (iii) subject to Section 13 of the Plan, no more than the number of shares of
Common Stock equal to the Absolute Share Limit may be delivered in the aggregate pursuant to the exercise of Incentive Stock Options granted under the Plan; (iv) subject to Section 13 of the Plan, no more than
[                ] shares of Common Stock (excluding those shares of Restricted Stock received by Participants in exchange for (or redemption of) partnership or limited
liability interests contemporaneous with the adoption of the Plan) may be delivered in respect of Performance Compensation Awards denominated in shares of Common Stock granted pursuant to Section 12 of the Plan to any individual Participant for
a single fiscal year during a Performance Period (or with respect to each single fiscal year in the event a Performance Period extends beyond a single fiscal year), or in the event such share denominated Performance Compensation Award is paid in
cash, other securities, other Awards or other property, no more than the Fair Market Value of such shares of Common Stock on the last day of the Performance Period to which such Award relates ; (v) the maximum number of shares of Common Stock
subject to Awards granted during a single fiscal year to any Non-Employee Director, taken together with any cash fees paid to such Non-Employee Director during the fiscal year, shall not exceed $[500,000] in total value (calculating the value of any
such Awards based on the grant date fair value of such Awards for financial reporting purposes and excluding, for this purpose, the value of any dividend equivalent payments paid pursuant to any Award granted in a previous fiscal year); and
(vi) the maximum amount that can be paid to any individual Participant for a single fiscal year during a Performance Period (or with respect to each single fiscal year in the event a Performance Period extends beyond a single fiscal year)
pursuant to a Performance Compensation Award denominated in cash (described in Section 12(a) of the Plan) shall be $[5,000,000]. Unless the Committee shall otherwise determine, shares of Common Stock delivered by the Company or its Affiliates
upon exchange of OP Units or other equity securities of any Subsidiary of the Company that have been issued under the Plan shall be issued under the Plan. 

(c) Other than with respect to Substitute Awards, to the extent that an Award expires or is canceled, forfeited, terminated, settled in cash,
or otherwise is settled without delivery to the Participant of the full number of shares of Common Stock to which the Award related, the undelivered shares will again be available for grant. Shares of Common Stock withheld in payment of the exercise
price or taxes relating to an Award and shares equal to the number of shares surrendered in payment of any Exercise Price or Strike Price, or taxes relating to an Award, shall be deemed to constitute shares not delivered to the Participant and shall
be deemed to again be available for Awards under the Plan; provided, however, that such shares shall not become available for issuance hereunder if either (i) the applicable shares are withheld or surrendered following the termination of
the Plan or (ii) at the time the applicable shares are withheld or surrendered, it would constitute a material revision of the Plan subject to stockholder approval under any then-applicable rules of the national securities exchange on which the
Common Stock is listed. 
 (d) Shares of Common Stock delivered by the Company in settlement of Awards may be authorized and unissued
shares, shares held in the treasury of the Company, shares purchased on the open market or by private purchase or a combination of the foregoing. 

  
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 (e) Awards may, in the sole discretion of the Committee, be granted under the Plan in assumption
of, or in substitution for, outstanding awards previously granted by an entity directly or indirectly acquired by the Company or with which the Company combines (“Substitute Awards”). Substitute Awards shall not be counted against
the Absolute Share Limit; provided, that Substitute Awards issued in connection with the assumption of, or in substitution for, outstanding options intended to qualify as “incentive stock options” within the meaning of
Section 422 of the Code shall be counted against the aggregate number of shares of Common Stock available for Awards of Incentive Stock Options under the Plan. Subject to applicable stock exchange requirements, available shares under a
stockholder approved plan of an entity directly or indirectly acquired by the Company or with which the Company combines (as appropriately adjusted to reflect the acquisition or combination transaction) may be used for Awards under the Plan and
shall not reduce the number of shares of Common Stock available for delivery under the Plan. 
 6. Eligibility. Participation
in the Plan shall be limited to Eligible Persons. 
 7. Options. 

(a) General. Each Option granted under the Plan shall be evidenced by an Award agreement, in written or electronic form, which agreement
need not be the same for each Participant. Each Option so granted shall be subject to the conditions set forth in this Section 7, and to such other conditions not inconsistent with the Plan as may be reflected in the applicable Award agreement.
All Options granted under the Plan shall be Nonqualified Stock Options unless the applicable Award agreement expressly states that the Option is intended to be an Incentive Stock Option. Incentive Stock Options shall be granted only to Eligible
Persons who are employees of the Company and its Affiliates, and no Incentive Stock Option shall be granted to any Eligible Person who is ineligible to receive an Incentive Stock Option under the Code. No Option shall be treated as an Incentive
Stock Option unless the Plan has been approved by the stockholder of the Company in a manner intended to comply with the stockholder approval requirements of Section 422(b)(1) of the Code, provided that any Option intended to be an
Incentive Stock Option shall not fail to be effective solely on account of a failure to obtain such approval, but rather such Option shall be treated as a Nonqualified Stock Option unless and until such approval is obtained. In the case of an
Incentive Stock Option, the terms and conditions of such grant shall be subject to and comply with such rules as may be prescribed by Section 422 of the Code. If for any reason an Option intended to be an Incentive Stock Option (or any portion
thereof) shall not qualify as an Incentive Stock Option, then, to the extent of such nonqualification, such Option or portion thereof shall be regarded as a Nonqualified Stock Option appropriately granted under the Plan. 

(b) Exercise Price. Except as otherwise provided by the Committee in the case of Substitute Awards, the exercise price
(“Exercise Price”) per share of Common Stock for each Option shall not be less than 100% of the Fair Market Value of such share (determined as of the Date of Grant); provided, however, that in the case of an Incentive Stock
Option granted to an employee who, at the time of the grant of such Option, owns stock representing more than 10% of the voting power of all classes of stock of the Company or any Affiliate, the Exercise Price per share shall be no less than 110% of
the Fair Market Value per share on the Date of Grant. 

  
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 (c) Vesting and Expiration; Termination. 

(i) Options shall vest and become exercisable in such manner and on such date or dates or upon such events determined by the
Committee and shall expire after such period, not to exceed 10 years, as may be determined by the Committee (the “Option Period”); provided, that if the Option Period (other than in the case of an Incentive Stock Option)
would expire at a time when trading in the shares of Common Stock is prohibited by the Company’s insider trading policy (or Company-imposed “blackout period”), the Option Period shall be automatically extended until the 30th day
following the expiration of such prohibition; provided, however, that in no event shall the Option Period exceed five years from the Date of Grant in the case of an Incentive Stock Option granted to a Participant who on the Date of Grant owns
stock representing more than 10% of the voting power of all classes of stock of the Company or any Affiliate. 
 (ii) Unless
otherwise provided by the Committee, in the event of (A) a Participant’s Termination by the Company other than for Cause or (B) a Participant’s Termination by the Company due to death or Disability, in each case within 12 months
following a Change in Control, each outstanding Option granted to such Participant shall become fully vested and immediately exercisable as of the date of such Termination; provided, that in the event the vesting or exercisability of any
Option would otherwise be subject to the achievement of performance conditions, the portion of any such Option that shall become fully vested and immediately exercisable shall be based on (x) actual performance through the date of termination
as determined by the Committee, or (y) if the Committee determines that measurement of actual performance cannot be reasonably assessed, the assumed achievement of target performance as determined by the Committee, in each case prorated based
on the time elapsed from the date of grant to the date of Termination. 
 (iii) Unless otherwise provided by the Committee,
in the event of (A) a Participant’s Termination by the Company for Cause, all outstanding Options granted to such Participant shall immediately terminate and expire, (B) a Participant’s Termination by the Company due to death or
Disability, after taking into account any accelerated vesting under the preceding clause (ii), each outstanding unvested Option granted to such Participant shall immediately terminate and expire, and each outstanding vested Option shall remain
exercisable for one (1) year thereafter (but in no event beyond the expiration of the Option Period) and (C) a Participant’s Termination for any other reason, after taking into account any accelerated vesting under the preceding
clause (ii), each outstanding unvested Option granted to such Participant shall immediately terminate and expire, and each outstanding vested Option shall remain exercisable for 90 days thereafter (but in no event beyond the expiration of the Option
Period). 
 (d) Method of Exercise and Form of Payment. No shares of Common Stock shall be delivered pursuant to any exercise of an
Option until payment in full of the Exercise Price therefor is received by the Company and the Participant has paid to the Company an amount equal to any Federal, state, local and non-U.S. income and employment and any other applicable taxes
required to be withheld. Options which have become exercisable may be exercised by delivery of written or electronic notice of exercise to the Company (or telephonic 

  
 13 

 
instructions to the extent provided by the Committee) in accordance with the terms of the Option accompanied by payment of the Exercise Price. The Exercise Price shall be payable (i) in
cash, check, cash equivalent and/or shares of Common Stock valued at the Fair Market Value at the time the Option is exercised (including, pursuant to procedures approved by the Committee, by means of attestation of ownership of a sufficient number
of shares of Common Stock in lieu of actual delivery of such shares to the Company); provided, that such shares of Common Stock are not subject to any pledge or other security interest; or (ii) by such other method as the Committee may
permit in its sole discretion, including without limitation: (A) in other property having a fair market value on the date of exercise equal to the Exercise Price or (B) if there is a public market for the shares of Common Stock at such
time, by means of a broker-assisted “cashless exercise” pursuant to which the Company is delivered (including telephonically to the extent permitted by the Committee) a copy of irrevocable instructions to a stockbroker to sell the shares
of Common Stock otherwise deliverable upon the exercise of the Option and to deliver promptly to the Company an amount equal to the Exercise Price or (C) a “net exercise” procedure effected by withholding the minimum number of shares
of Common Stock otherwise deliverable in respect of an Option that are needed to pay the Exercise Price and all applicable required withholding and any other applicable taxes. Any fractional shares of Common Stock shall be settled in cash. 

(e) Notification upon Disqualifying Disposition of an Incentive Stock Option. Each Participant awarded an Incentive Stock Option under
the Plan shall notify the Company in writing immediately after the date he or she makes a disqualifying disposition of any Common Stock acquired pursuant to the exercise of such Incentive Stock Option. A disqualifying disposition is any disposition
(including, without limitation, any sale) of such Common Stock before the later of (A) two years after the Date of Grant of the Incentive Stock Option or (B) one year after the date of exercise of the Incentive Stock Option. The Company
may, if determined by the Committee and in accordance with procedures established by the Committee, retain possession, as agent for the applicable Participant, of any Common Stock acquired pursuant to the exercise of an Incentive Stock Option until
the end of the period described in the preceding sentence, subject to complying with any instructions from such Participant as to the sale of such Common Stock. 

(f) Compliance With Laws, etc. Notwithstanding the foregoing, in no event shall a Participant be permitted to exercise an Option in a
manner which the Committee determines would violate the Sarbanes-Oxley Act of 2002, or any other applicable law or the applicable rules and regulations of the Securities and Exchange Commission or the applicable rules and regulations of any
securities exchange or inter-dealer quotation system on which the securities of the Company are listed or traded. 
 8. Stock
Appreciation Rights. 
 (a) General. Each SAR granted under the Plan shall be evidenced by an Award agreement, in written
or electronic form, which agreement need not be the same for each Participant. Each SAR so granted shall be subject to the conditions set forth in this Section 8, and to such other conditions not inconsistent with the Plan as may be reflected
in the applicable Award agreement. Any Option granted under the Plan may include tandem SARs. The Committee also may award SARs to Eligible Persons independent of any Option. 

  
 14 

 (b) Strike Price. Except as otherwise provided by the Committee in the case of Substitute
Awards, the strike price (“Strike Price”) per share of Common Stock for each SAR shall not be less than 100% of the Fair Market Value of such share (determined as of the Date of Grant). Notwithstanding the foregoing, a SAR granted
in tandem with (or in substitution for) an Option previously granted shall have a Strike Price equal to the Exercise Price of the corresponding Option. 

(c) Vesting and Expiration. 

(i) A SAR granted in connection with an Option shall become exercisable and shall expire according to the same vesting schedule
and expiration provisions as the corresponding Option. A SAR granted independent of an Option shall vest and become exercisable and shall expire in such manner and on such date or dates or upon such events determined by the Committee and shall
expire after such period, not to exceed 10 years, as may be determined by the Committee (the “SAR Period”); provided, that if the SAR Period would expire at a time when trading in the shares of Common Stock is prohibited by
the Company’s insider trading policy (or Company-imposed “blackout period”), the SAR Period shall be automatically extended until the 30th day following the expiration of such prohibition. 

(ii) Unless otherwise provided by the Committee, in the event of (A) a Participant’s Termination other than for Cause
or (B) a Participant’s Termination due to death or Disability, in each case within 12 months following a Change in Control, each outstanding SAR granted to such Participant shall become fully vested and immediately exercisable as of the
date of such Termination; provided, that in the event the vesting or exercisability of any SAR would otherwise be subject to the achievement of performance conditions, the portion of any such SAR that shall become fully vested and immediately
exercisable shall be based on (x) actual performance through the date of termination as determined by the Committee, or (y) if the Committee determines that measurement of actual performance cannot be reasonably assessed, the assumed
achievement of target performance as determined by the Committee, in each case prorated based on the time elapsed from the date of grant to the date of Termination. 

(iii) Unless otherwise provided by the Committee, whether in an Award agreement or otherwise, in the event of (A) a
Participant’s Termination by the Service Recipient for Cause, all outstanding SARs granted to such Participant shall immediately terminate and expire, (B) a Participant’s Termination due to death or Disability, after taking into
account any accelerated vesting under the preceding clause (ii), each outstanding unvested SAR granted to such Participant shall immediately terminate and expire, and each outstanding vested SAR shall remain exercisable for one (1) year
thereafter (but in no event beyond the expiration of the SAR Period) and (C) a Participant’s Termination for any other reason, after taking into account any accelerated vesting under the preceding clause (ii), each outstanding unvested SAR
granted to such Participant shall immediately terminate and expire, and each outstanding vested SAR shall remain exercisable for 90 days thereafter (but in no event beyond the expiration of the SAR Period). 

  
 15 

 (d) Method of Exercise. SARs which have become exercisable may be exercised by delivery of
written or electronic notice of exercise to the Company in accordance with the terms of the Award, specifying the number of SARs to be exercised and the date on which such SARs were awarded. 

(e) Payment. Upon the exercise of a SAR, the Company shall pay to the Participant an amount equal to the number of shares subject to
the SAR that are being exercised multiplied by the excess, if any, of the Fair Market Value of one share of Common Stock on the exercise date over the Strike Price, less an amount equal to any Federal, state, local and non-U.S. income, employment
and any other applicable taxes required to be withheld. The Company shall pay such amount in cash, in shares of Common Stock valued at Fair Market Value, or any combination thereof, as determined by the Committee. Any fractional shares of Common
Stock shall be settled in cash. 
 (f) Substitution of SARs for Nonqualified Stock Options. The Committee shall have the authority in
its sole discretion to substitute, without the consent of the affected Participant or any holder or beneficiary of SARs, SARs settled in shares of Common Stock (or settled in shares or cash in the sole discretion of the Committee) for outstanding
Nonqualified Stock Options, provided that (i) the substitution shall not otherwise result in a modification of the terms of any such Nonqualified Stock Option, (ii) the number of shares of Common Stock underlying the substituted
SARs shall be the same as the number of shares of Common Stock underlying such Nonqualified Stock Options and (iii) the Strike Price of the substituted SARs shall be equal to the Exercise Price of such Nonqualified Stock Options; provided,
however, that if, in the opinion of the Company’s independent public auditors, the foregoing provision creates adverse accounting consequences for the Company, such provision shall be considered null and void. 

9. Restricted Stock and Restricted Stock Units. 

(a) General. Each grant of Restricted Stock and Restricted Stock Units shall be evidenced by an Award agreement, in written or
electronic form, which agreement need not be the same for each Participant. Each Restricted Stock and Restricted Stock Unit so granted shall be subject to the conditions set forth in this Section 9, and to such other conditions not inconsistent
with the Plan as may be reflected in the applicable Award agreement. 
 (b) Stock Certificates and Book Entry; Escrow or Similar
Arrangement. Upon the grant of Restricted Stock, the Committee shall cause a stock certificate registered in the name of the Participant to be issued or shall cause share(s) of Common Stock to be registered in the name of the Participant and
held in book-entry form subject to the Company’s directions and, if the Committee determines that the Restricted Stock shall be held by the Company or in escrow rather than delivered to the Participant pending the release of the applicable
restrictions, the Committee may require the Participant to additionally execute and deliver to the Company (i) an escrow agreement satisfactory to the Committee, if applicable, and (ii) the appropriate stock power (endorsed in blank) with
respect to the Restricted Stock covered by such agreement. If a Participant shall fail to execute and deliver (in a manner permitted under Section 15(a) of the Plan or as otherwise determined by the Committee) an agreement evidencing an Award
of Restricted Stock and, if applicable, an escrow agreement and blank stock power within the 

  
 16 

 
amount of time specified by the Committee, the Award shall be null and void. Subject to the restrictions set forth in this Section 9 and the applicable Award agreement, the Participant
generally shall have the rights and privileges of a stockholder as to such Restricted Stock, including without limitation the right to vote such Restricted Stock and to receive any dividends payable on such shares of Restricted Stock. To the extent
shares of Restricted Stock are forfeited, any stock certificates issued to the Participant evidencing such shares shall be returned to the Company, and all rights of the Participant to such shares and as a stockholder with respect thereto shall
terminate without further obligation on the part of the Company. 
 (c) Vesting; Acceleration of Lapse of Restrictions. 

(i) The Restricted Period with respect to Restricted Stock and Restricted Stock Units shall lapse in such manner and on such
date or dates or upon such events determined by the Committee, and the Committee shall determine the treatment of the unvested portion of Restricted Stock and Restricted Stock Units upon Termination of the Participant granted the applicable Award.

 (ii) Unless otherwise provided by the Committee, in the event of (A) a Participant’s Termination by the Company
other than for Cause, or (B) a Participant’s Termination due to death or Disability, in each case within 12 months following a Change in Control, outstanding Restricted Stock and Restricted Stock Units granted to such Participant shall
become fully vested and the restrictions thereon shall immediately lapse as of the date of such Termination; provided, that in the event the vesting or lapse of restrictions of any Restricted Stock or Restricted Stock Units would otherwise be
subject to the achievement of performance conditions, the portion of any such Restricted Stock or Restricted Stock Units that shall become fully vested and free from such restrictions shall be based on (x) actual performance through the date of
termination as determined by the Committee, or (y) if the Committee determines that measurement of actual performance cannot be reasonably assessed, the assumed achievement of target performance as determined by the Committee, in each case
prorated based on the time elapsed from the date of grant to the date of Termination. 
 (d) Delivery of Restricted Stock and Settlement
of Restricted Stock Units. 
 (i) Upon the expiration of the Restricted Period with respect to any shares of Restricted
Stock, the restrictions set forth in the applicable Award agreement shall be of no further force or effect with respect to such shares, except as set forth in the applicable Award agreement. If an escrow arrangement is used, upon such expiration,
the Company shall deliver to the Participant, or his or her beneficiary, without charge, the stock certificate (or, if applicable, a notice evidencing a book entry notation) evidencing the shares of Restricted Stock which have not then been
forfeited and with respect to which the Restricted Period has expired (rounded down to the nearest full share). 
 (ii)
Unless otherwise provided by the Committee in an Award agreement or otherwise, upon the expiration of the Restricted Period with respect to any outstanding Restricted Stock Units, the Company shall deliver to the Participant, or his or her
beneficiary, without charge, one share of Common Stock (or other securities or other 

  
 17 

 
property, as applicable) for each such outstanding Restricted Stock Unit granted pursuant to the applicable Award Agreement; provided, however, that the Committee may, in its sole
discretion, elect to (i) pay cash or part cash and part Common Stock in lieu of delivering only shares of Common Stock in respect of such Restricted Stock Units or (ii) defer the delivery of Common Stock (or cash or part Common Stock and
part cash, as the case may be) beyond the expiration of the Restricted Period if such extension would not cause adverse tax consequences under Section 409A of the Code. If a cash payment is made in lieu of delivering shares of Common Stock, the
amount of such payment shall be equal to the Fair Market Value of the Common Stock as of the date on which the Restricted Period lapsed with respect to such Restricted Stock Units. To the extent provided in an Award agreement, the holder of
outstanding Restricted Stock Units shall be entitled to be credited with dividend equivalent payments (upon the payment by the Company of dividends on shares of Common Stock) either in cash or, at the sole discretion of the Committee, in shares of
Common Stock having a Fair Market Value equal to the amount of such dividends (and interest may, at the sole discretion of the Committee, be credited on the amount of cash dividend equivalents at a rate and subject to such terms as determined by the
Committee), which accumulated dividend equivalents (and interest thereon, if applicable) shall be payable at the same time as the underlying Restricted Stock Units are settled following the release of restrictions on such Restricted Stock Units,
and, if such Restricted Stock Units are forfeited, the Participant shall have no right to such dividend equivalent payments. 
 (e)
Legends on Restricted Stock. Each certificate representing Restricted Stock awarded under the Plan, if any, shall bear a legend substantially in the form of the following, in addition to any other information the Company deems appropriate,
until the lapse of all restrictions with respect to such shares of Common Stock: 
 TRANSFER OF THIS CERTIFICATE AND THE SHARES REPRESENTED
HEREBY IS RESTRICTED PURSUANT TO THE TERMS OF THE SUMMIT MATERIALS, INC. 2014 OMNIBUS INCENTIVE PLAN AND A RESTRICTED STOCK AWARD AGREEMENT, BETWEEN SUMMIT MATERIALS, INC. AND PARTICIPANT. A COPY OF SUCH PLAN AND AWARD AGREEMENT IS ON FILE AT THE
PRINCIPAL EXECUTIVE OFFICES OF SUMMIT MATERIALS, INC. 
 10. OP Units. 

(a) General. Awards may be granted under the Plan in the form of undivided fractional limited partnership interests in Summit Materials
Holdings L.P. (together with any successor entity, the “Operating Partnership”), a Delaware limited partnership, the entity through which the Company conducts its business and an entity that has elected to be treated as a partnership for
federal income tax purposes, of one or more classes (“OP Units”) established pursuant to the Operating Partnership’s agreement of limited partnership, as amended from time to time. Awards of OP Units shall be valued by reference to,
or otherwise determined by reference to or based on, shares of Common Stock . OP Units awarded under the Plan may be (1) convertible, exchangeable or redeemable for other limited partnership interests in the Operating Partnership (including OP
Units of a different class or series) or shares of Common 

  
 18 

 
Stock, or (2) valued by reference to the book value, fair value or performance of the Operating Partnership. Awards of OP Units are intended to qualify as “profits interests”
within the meaning of IRS Revenue Procedure 93-27, as clarified by IRS Revenue Procedure 2001-43, with respect to a Participant in the Plan who is rendering services to or for the benefit of the Operating Partnership, including its subsidiaries.

 (b) Share Calculations. For purposes of calculating the number of shares of Common Stock underlying an award of OP Units relative
to the total number of shares of Common Stock available for issuance under the Plan, the Committee shall establish in good faith the maximum number of shares of Common Stock to which a Participant receiving such award of OP Units may be entitled
upon fulfillment of all applicable conditions set forth in the relevant award documentation, including vesting conditions, partnership capital account allocations, value accretion factors, conversion ratios, exchange ratios and other similar
criteria. If and when any such conditions are no longer capable of being met, in whole or in part, the number of shares of Common Stock underlying such awards of OP Units shall be reduced accordingly by the Committee, and the number of shares of
Common Stock shall be increased by one share of Common Stock for each share so reduced. Awards of OP Units may be granted either alone or in addition to other awards granted under the Plan. The Committee shall determine the eligible Participants to
whom, and the time or times at which, awards of OP Units shall be made; the number of OP Units to be awarded; the price, if any, to be paid by the Participant for the acquisition of such OP Units (which may be less than the fair value of the OP
Unit); and the restrictions and conditions applicable to such award of OP Units. Conditions may be based on continuing employment (or other service relationship), computation of financial metrics and/or achievement of pre-established performance
goals and objectives, with related length of the service period for vesting, minimum or maximum performance thresholds, measurement procedures and length of the performance period to be established by the Committee at the time of grant, in its sole
discretion (or any other Performance Criteria). The Committee may allow awards of OP Units to be held through a limited partnership, or similar “look-through” entity, and the Committee may require such limited partnership or similar entity
to impose restrictions on its partners or other beneficial owners that are not inconsistent with the provisions of this Section 10. The provisions of the grant of OP Units need not be the same with respect to each Participant. 

(c) Dividends and Distributions. Notwithstanding Section 15(c), the award agreement or other award documentation in respect of an
award of OP Units may provide that the recipient of OP Units shall be entitled to receive, currently or on a deferred or contingent basis, dividends or dividend equivalents with respect to the number of shares of Common Stock underlying the award or
other distributions from the Operating Partnership prior to vesting (whether based on a period of time or based on attainment of specified performance conditions), as determined at the time of grant by the Committee, in its sole discretion, and the
Committee may provide that such amounts (if any) shall be deemed to have been reinvested in additional shares of Common Stock or OP Units. 

11. Other Stock-Based Awards and Other Cash-Based Awards. 

(a) The Committee may issue unrestricted Common Stock, rights to receive grants of Awards at a future date, other Awards denominated in Common
Stock (including, without 

  
 19 

 
limitation, performance shares or performance units, or other Awards denominated in cash (including cash bonuses)), under the Plan to Eligible Persons, alone or in tandem with other Awards, in
such amounts as the Committee shall from time to time in its sole discretion determine. Each Other Stock-Based Award or Other Cash-Based Award, as applicable, granted under the Plan shall be evidenced by an Award agreement, in written or electronic
form, which agreement need not be the same for each Participant, or as otherwise determined by the Committee. Each Other Stock-Based Award or Cash-Based Award, as applicable, so granted shall be subject to such conditions not inconsistent with the
Plan as may be reflected in the applicable Award agreement. 
 (b) Unless otherwise provided by the Committee, in the event of (A) a
Participant’s Termination by the Company other than for Cause, or (B) a Participant’s Termination due to death or Disability, in each case within 12 months following a Change in Control, outstanding Other Stock-Based Awards granted to
such Participant shall become fully vested and the restrictions thereon shall immediately lapse as of the date of such Termination; provided, that in the event the vesting or lapse of restrictions of any Other Stock-Based Awards would
otherwise be subject to the achievement of performance conditions, the portion of any such Other Stock-Based Awards that shall become fully vested and free from such restrictions shall be based on (x) actual performance through the date of
termination as determined by the Committee, or (y) if the Committee determines that measurement of actual performance cannot be reasonably assessed, the assumed achievement of target performance as determined by the Committee, in each case
prorated based on the time elapsed from the date of grant to the date of Termination. 
 12. Performance Compensation Awards.

 (a) General. The Committee shall have the authority, at or before the time of grant of any Award, to designate such Award as a
Performance Compensation Award intended to qualify as “performance-based compensation” under Section 162(m) of the Code. The Committee shall also have the authority to make an award of a cash bonus to any Participant and designate
such Award as a Performance Compensation Award intended to qualify as “performance-based compensation” under Section 162(m) of the Code. Notwithstanding anything in the Plan to the contrary, if the Company determines that a
Participant who has been granted an Award designated as a Performance Compensation Award is not (or is no longer) a “covered employee” (within the meaning of Section 162(m) of the Code), the terms and conditions of such Award may be
modified without regard to any restrictions or limitations set forth in this Section 12 (but subject otherwise to the provisions of Section 14 of the Plan). 

(b) Discretion of Committee with Respect to Performance Compensation Awards. With regard to a particular Performance Period, the
Committee shall have sole discretion to select the length of such Performance Period, the type(s) of Performance Compensation Awards to be issued, the Performance Criteria that will be used to establish the Performance Goal(s), the kind(s) and/or
level(s) of the Performance Goals(s) that is (are) to apply and the Performance Formula(e). Within the first 90 days of a Performance Period (or, within any other maximum period allowed under Section 162(m) of the Code), the Committee shall,
with regard to the Performance Compensation Awards to be issued for such Performance Period, exercise its discretion with respect to each of the matters enumerated in the immediately preceding sentence and record the same in writing. 

  
 20 

 (c) Performance Criteria. The Performance Criteria that will be used to establish the
Performance Goal(s) may be based on the attainment of specific levels of performance of the Company (and/or one or more Affiliates, divisions or operational and/or business units, product lines, brands, business segments, administrative departments,
or any combination of the foregoing) and shall be limited to the following, which may be determined in accordance with generally accepted accounting principles (“GAAP”) or on a non-GAAP basis: net earnings or net income (before or after
taxes); cash flow, including but not limited to operating cash flow or free cash flow; cash and/or funds available for distribution; earnings before interest, taxes, depreciation and amortization (“EBITDA”); growth in EBITDA determined on
an annual, multi-year or other basis; deployment of value-adding capital via organic investment or acquisitions; return measures (including, but not limited to, return on assets, investment, capital, invested capital, equity and/or development);
share price (including, but not limited to, appreciation, growth measures and total shareholder return on an annual, multi-year or other basis); debt and debt related ratios, including debt to total market capitalization, debt to EBITDA, debt to
assets and fixed charge coverage ratios (determined with or without the pro rata share of the Company’s ownership interest in co-investment partnerships); net asset value per share; growth in net asset value per share determined on an annual,
multi-year or other basis; basic or diluted earnings per share (before or after taxes); expense targets or cost reduction goals, general and administrative expense savings; operating efficiency; working capital targets; measures of economic value
added or other “value creation” metrics; enterprise value; competitive market metrics; performance or yield on development or redevelopment projects; objective measures of personal targets, goals or completion of projects (including but
not limited to succession and hiring projects, completion of specific acquisitions, dispositions, reorganizations or other corporate transactions or capital-raising transactions, expansions of specific business operations and meeting divisional or
project budgets); market share; operational or performance measurements relative to peers; strategic objectives and related revenue; productivity measures; employee retention; workplace health and safety; objective measures of employee morale and
satisfaction; corporate social responsibility measures; environmental safety or compliance metrics; or any combination of the foregoing. Any one or more of the Performance Criteria may be stated as a percentage of another Performance Criteria, or
used on an absolute or relative basis to measure the performance of the Company and/or one or more Affiliates as a whole or any divisions or operational and/or business units, product lines, brands, business segments, administrative departments of
the Company and/or one or more Affiliates or any combination thereof, as the Committee may deem appropriate, or any of the above Performance Criteria may be compared to the performance of a selected group of comparison companies, or a published or
special index that the Committee, in its sole discretion, deems appropriate, or as compared to various stock market indices. The Committee also has the authority to provide for accelerated vesting of any Award based on the achievement of Performance
Goals pursuant to the Performance Criteria specified in this paragraph. To the extent required under Section 162(m) of the Code, the Committee shall, within the first 90 days of a Performance Period (or, within any other maximum period allowed
under Section 162(m) of the Code), define in an objective fashion the manner of calculating the Performance Criteria it selects to use for such Performance Period. 

(d) Modification of Performance Goal(s). In the event that applicable tax and/or securities laws change to permit Committee discretion
to alter the governing Performance Criteria without obtaining stockholder approval of such alterations, the Committee shall have 

  
 21 

 
sole discretion to make such alterations without obtaining stockholder approval. Unless otherwise determined by the Committee at the time a Performance Compensation Award is granted, the
Committee shall, during the first 90 days of a Performance Period (or, within any other maximum period allowed under Section 162(m) of the Code), or at any time thereafter to the extent the exercise of such authority at such time would not
cause the Performance Compensation Awards granted to any Participant for such Performance Period to fail to qualify as “performance-based compensation” under Section 162(m) of the Code, specify adjustments or modifications to be made
to the calculation of a Performance Goal for such Performance Period, based on and in order to appropriately reflect the following events: (i) asset write-downs; (ii) litigations, claims, judgments or settlements; (iii) the effect of
changes in tax laws, accounting principles, or other laws or regulatory rules affecting reported results; (iv) any reorganization and restructuring programs; (v) extraordinary nonrecurring items as described in Accounting Standards
Codification Topic 225-20 (or any successor pronouncement thereto) and/or in management’s discussion and analysis of financial condition and results of operations appearing in the Company’s annual report to stockholders for the applicable
year; (vi) acquisitions or divestitures; (vii) any other specific, unusual or nonrecurring events, or objectively determinable category thereof; (viii) foreign exchange gains and losses; (ix) discontinued operations and
nonrecurring charges; (x) a change in the Company’s fiscal year; (xi) accruals for payments to be made in respect of the Plan or other specified compensation arrangements, and (xi) any other event described in Section 13.

 (e) Payment of Performance Compensation Awards. 

(i) Condition to Receipt of Payment. Unless otherwise provided in the applicable Award agreement, a Participant must be
employed by the Company on the last day of a Performance Period to be eligible for payment in respect of a Performance Compensation Award for such Performance Period. 

(ii) Limitation. Unless otherwise provided in the applicable Award agreement, a Participant shall be eligible to receive
payment in respect of a Performance Compensation Award only to the extent that: (A) the Performance Goals for such period are achieved; and (B) all or some of the portion of such Participant’s Performance Compensation Award has been
earned for the Performance Period based on the application of the Performance Formula to such achieved Performance Goals; provided, however, that in the event of (x) a Participant’s Termination by the Company other than for Cause,
or (y) a Participant’s Termination due to death or Disability, in each case within 12 months following a Change in Control, the Participant shall receive payment in respect of a Performance Compensation Award based on (1) actual
performance through the date of Termination as determined by the Committee, or (2) if the Committee determines that measurement of actual performance cannot be reasonably assessed, the assumed achievement of target performance as determined by
the Committee (but not to the extent that application of this clause (2) would cause Section 162(m) of the Code to result in the loss of the deduction of the compensation payable in respect of such Performance Compensation Award for any
Participant reasonably expected to be a “covered employee” within the meaning of Section 162(m) of the Code), in each case prorated based on the time elapsed from the date of grant to the date of Termination. 

  
 22 

 (iii) Certification. Following the completion of a Performance Period, the
Committee shall review and certify in writing whether, and to what extent, the Performance Goals for the Performance Period have been achieved and, if so, calculate and certify in writing that amount of the Performance Compensation Awards earned for
the period based upon the Performance Formula. The Committee shall then determine the amount of each Participant’s Performance Compensation Award actually payable for the Performance Period and, in so doing, may apply Negative Discretion. 

(iv) Use of Negative Discretion. In determining the actual amount of an individual Participant’s Performance
Compensation Award for a Performance Period, the Committee may reduce or eliminate the amount of the Performance Compensation Award earned under the Performance Formula in the Performance Period through the use of Negative Discretion. Unless
otherwise provided in the applicable Award agreement, the Committee shall not have the discretion to (A) grant or provide payment in respect of Performance Compensation Awards for a Performance Period if the Performance Goals for such
Performance Period have not been attained; or (B) increase a Performance Compensation Award above the applicable limitations set forth in Section 5 of the Plan. 

(f) Timing of Award Payments. Unless otherwise provided in the applicable Award agreement, Performance Compensation Awards granted for
a Performance Period shall be paid to Participants as soon as administratively practicable following completion of the certifications required by this Section 12. Any Performance Compensation Award that has been deferred shall not (between the
date as of which the Award is deferred and the payment date) increase (i) with respect to a Performance Compensation Award that is payable in cash, by a measuring factor for each fiscal year greater than a reasonable rate of interest set by the
Committee or (ii) with respect to a Performance Compensation Award that is payable in shares of Common Stock, by an amount greater than the appreciation of a share of Common Stock from the date such Award is deferred to the payment date. Any
Performance Compensation Award that is deferred and is otherwise payable in shares of Common Stock shall be credited (during the period between the date as of which the Award is deferred and the payment date) with dividend equivalents (in a manner
consistent with the methodology set forth in the last sentence of Section 9(d)(ii) of the Plan). 
 13. Changes in Capital Structure
and Similar Events. In the event of (a) any dividend (other than regular cash dividends) or other distribution (whether in the form of cash, shares of Common Stock, other securities or other property), recapitalization, stock split,
reverse stock split, reorganization, merger, consolidation, split-up, split-off, spin-off, combination, repurchase or exchange of shares of Common Stock or other securities of the Company, issuance of warrants or other rights to acquire shares of
Common Stock or other securities of the Company, or other similar corporate transaction or event (including, without limitation, a Change in Control) that affects the shares of Common Stock, or (b) unusual or nonrecurring events (including,
without limitation, a Change in Control) affecting the Company, any Affiliate, or the financial statements of the Company or any Affiliate, or changes in applicable rules, rulings, regulations or other requirements of any governmental body or
securities exchange or inter-dealer quotation system, accounting principles or law, such that in either case an adjustment is determined by the Committee in its sole discretion to be necessary or appropriate, then the

  
 23 

 
Committee shall make any such adjustments in such manner as it may deem equitable, including without limitation, any or all of the following: 

(i) adjusting any or all of (A) the Absolute Share Limit, or any other limit applicable under the Plan with respect to the
number of Awards which may be granted hereunder, (B) the number of shares of Common Stock or other securities of the Company (or number and kind of other securities or other property) which may be delivered in respect of Awards or with respect
to which Awards may be granted under the Plan (including, without limitation, adjusting any or all of the limitations under Section 5 of the Plan) and (C) the terms of any outstanding Award, including, without limitation, (1) the
number of shares of Common Stock or other securities of the Company (or number and kind of other securities or other property) subject to outstanding Awards or to which outstanding Awards relate, (2) the Exercise Price or Strike Price with
respect to any Award or (3) any applicable performance measures (including, without limitation, Performance Criteria and Performance Goals); 

(ii) providing for a substitution or assumption of Awards (or awards of an acquiring company), accelerating the exercisability
of, lapse of restrictions on, or termination of, Awards or providing for a period of time (which shall not be required to be more than 10 days) for Participants to exercise outstanding Awards prior to the occurrence of such event (and any such Award
not so exercised shall terminate upon the occurrence of such event); and 
 (iii) cancelling any one or more outstanding
Awards and causing to be paid to the holders holding vested Awards (including any Awards that would vest as a result of the occurrence of such event but for such cancellation) the value of such Awards, if any, as determined by the Committee (which
if applicable may be based upon the price per share of Common Stock received or to be received by other stockholders of the Company in such event), including without limitation, in the case of an outstanding Option or SAR, a cash payment in an
amount equal to the excess, if any, of the Fair Market Value (as of a date specified by the Committee) of the shares of Common Stock subject to such Option or SAR over the aggregate Exercise Price or Strike Price of such Option or SAR, respectively
(it being understood that, in such event, any Option or SAR having a per share Exercise Price or Strike Price equal to, or in excess of, the Fair Market Value of a share of Common Stock subject thereto may be canceled and terminated without any
payment or consideration therefor); 
 provided, however, that in the case of any “equity restructuring” (within the meaning of the
Financial Accounting Standards Board Accounting Standards Codification Topic 718 (or any successor pronouncement thereto)), the Committee shall make an equitable or proportionate adjustment to outstanding Awards to reflect such equity restructuring.
Any adjustment in Incentive Stock Options under this Section 13 (other than any cancellation of Incentive Stock Options) shall be made only to the extent not constituting a “modification” within the meaning of Section 424(h)(3)
of the Code, and any adjustments under this Section 13 shall be made in a manner which does not adversely affect the exemption provided pursuant to Rule 16b-3 under the Exchange Act. Any such adjustment shall be conclusive and binding for all
purposes. Payments to holders pursuant to clause (iii) above shall be made in cash or, in the sole discretion  

  
 24 

 
of the Committee, in the form of such other consideration necessary for a Participant to receive property, cash, or securities (or combination thereof) as such Participant would have been
entitled to receive upon the occurrence of the transaction if the Participant had been, immediately prior to such transaction, the holder of the number of shares of Common Stock covered by the Award at such time (less any applicable Exercise Price
or Strike Price). In addition, prior to any payment or adjustment contemplated under this Section 13, the Committee may require a Participant to (A) represent and warrant as to the unencumbered title to his Awards, (B) bear such
Participant’s pro rata share of any post-closing indemnity obligations, and be subject to the same post-closing purchase price adjustments, escrow terms, offset rights, holdback terms, and similar conditions as the other holders of Stock,
(C) deliver customary transfer documentation as reasonably determined by the Committee and (D) satisfy any applicable tax withholding obligations. 

14. Amendments and Termination. 

(a) Amendment and Termination of the Plan. The Board may amend, alter, suspend, discontinue, or terminate the Plan or any portion
thereof at any time; provided, that no such amendment, alteration, suspension, discontinuation or termination shall be made without stockholder approval if (i) such approval is necessary to comply with any regulatory requirement
applicable to the Plan (including, without limitation, as necessary to comply with any rules or regulations of any securities exchange or inter-dealer quotation system on which the securities of the Company may be listed or quoted or for changes in
GAAP to new accounting standards, (ii) it would materially increase the number of securities which may be issued under the Plan (except for increases pursuant to Section 5 or 13), or (iii) it would materially modify the requirements
for participation in the Plan; provided, further, that any such amendment, alteration, suspension, discontinuance or termination that would materially and adversely affect the rights of any Participant or any holder or beneficiary of any
Award theretofore granted shall not to that extent be effective without the consent of the affected Participant, holder or beneficiary. Notwithstanding the foregoing, no amendment shall be made to the last proviso of Section 14(b) without
stockholder approval. 
 (b) Amendment of Award Agreements. The Committee may, to the extent consistent with the terms of any
applicable Award agreement, waive any conditions or rights under, amend any terms of, or alter, suspend, discontinue, cancel or terminate, any Award theretofore granted or the associated Award agreement, prospectively or retroactively (including
after a Participant’s Termination from the Company); provided that any such waiver, amendment, alteration, suspension, discontinuance, cancellation or termination that would materially and adversely affect the rights of any Participant
with respect to any Award theretofore granted shall not to that extent be effective without the consent of the affected Participant; provided, further, that without stockholder approval, except as otherwise permitted under Section 13 of
the Plan, (i) no amendment or modification may reduce the Exercise Price of any Option or the Strike Price of any SAR, (ii) the Committee may not cancel any outstanding Option or SAR and replace it with a new Option or SAR (with a lower
Exercise Price or Strike Price, as the case may be) or other Award or cash payment that is greater than the value of the cancelled Option or SAR, and (iii) the Committee may not take any other action which is considered a “repricing”
for purposes of the stockholder approval rules of any securities exchange or inter-dealer quotation system on which the securities of the Company are listed or quoted. 

  
 25 

 15. General. 

(a) Award Agreements. Each Award under the Plan shall be evidenced by an Award agreement, which shall be delivered to the Participant
and shall specify the terms and conditions of the Award and any rules applicable thereto, including without limitation, the effect on such Award of the death, Disability or Termination of a Participant, or of such other events as may be determined
by the Committee. For purposes of the Plan, an Award agreement may be in any such form (written or electronic) as determined by the Committee (including, without limitation, a Board or Committee resolution, an employment agreement, a notice, a
certificate or a letter) evidencing the Award. The Committee need not require an Award agreement to be signed by the Participant or a duly authorized representative of the Company. 

(b) Nontransferability. (i) Each Award shall be exercisable only by a Participant during the Participant’s lifetime, or, if
permissible under applicable law, by the Participant’s legal guardian or representative. No Award may be assigned, alienated, pledged, attached, sold or otherwise transferred or encumbered by a Participant (including, without limitation, except
as may be prohibited by applicable law, pursuant to a domestic relations order) other than by will or by the laws of descent and distribution and any such purported assignment, alienation, pledge, attachment, sale, transfer or encumbrance shall be
void and unenforceable against the Company or an Affiliate; provided that the designation of a beneficiary shall not constitute an assignment, alienation, pledge, attachment, sale, transfer or encumbrance. 

(ii) Notwithstanding the foregoing, the Committee may, in its sole discretion, permit Awards (other than Incentive Stock
Options) to be transferred by a Participant, without consideration, subject to such rules as the Committee may adopt consistent with any applicable Award agreement to preserve the purposes of the Plan, to: (A) any person who is a “family
member” of the Participant, as such term is used in the instructions to Form S-8 under the Securities Act or any successor form of registration statement promulgated by the Securities and Exchange Commission (collectively, the
“Immediate Family Members”); (B) a trust solely for the benefit of the Participant and his or her Immediate Family Members; (C) a partnership or limited liability company whose only partners or stockholders are the
Participant and his or her Immediate Family Members; or (D) a beneficiary to whom donations are eligible to be treated as “charitable contributions” for federal income tax purposes; 

(each transferee described in clauses (A), (B), (C) and (D) above is hereinafter referred to as a “Permitted
Transferee”); provided that the Participant gives the Committee advance written notice describing the terms and conditions of the proposed transfer and the Committee notifies the Participant in writing that such a transfer would
comply with the requirements of the Plan. 
 (iii) The terms of any Award transferred in accordance with the immediately
preceding sentence shall apply to the Permitted Transferee and any reference in the Plan, or in any applicable Award agreement, to a Participant shall be deemed to refer to the 

  
 26 

 
Permitted Transferee, except that (A) Permitted Transferees shall not be entitled to transfer any Award, other than by will or the laws of descent and distribution; (B) Permitted
Transferees shall not be entitled to exercise any transferred Option unless there shall be in effect a registration statement on an appropriate form covering the shares of Common Stock to be acquired pursuant to the exercise of such Option if the
Committee determines, consistent with any applicable Award agreement, that such a registration statement is necessary or appropriate; (C) the Committee or the Company shall not be required to provide any notice to a Permitted Transferee,
whether or not such notice is or would otherwise have been required to be given to the Participant under the Plan or otherwise; and (D) the consequences of the Termination of the Participant from the Company or an Affiliate under the terms of
the Plan and the applicable Award agreement shall continue to be applied with respect to the Participant, including, without limitation, that an Option shall be exercisable by the Permitted Transferee only to the extent, and for the periods,
specified in the Plan and the applicable Award agreement. 
 (c) Dividends and Dividend Equivalents. The Committee in its sole
discretion may provide a Participant as part of an Award with dividends or dividend equivalents, payable in cash, shares of Common Stock, other securities, other Awards or other property, on a current or deferred basis, on such terms and conditions
as may be determined by the Committee in its sole discretion, including without limitation, payment directly to the Participant, withholding of such amounts by the Company subject to vesting of the Award or reinvestment in additional shares of
Common Stock, Restricted Stock or other Awards; provided, that no dividends or dividend equivalents shall be payable in respect of outstanding (i) Options or SARs or (ii) unearned Performance Compensation Awards or other unearned
Awards subject to performance conditions (other than or in addition to the passage of time and other than Awards structured as Restricted Stock) (although dividends and dividend equivalents may be accumulated in respect of unearned Awards and paid
within 15 days after such Awards are earned and become payable or distributable). 
 (d) Tax Withholding. 

(i) A Participant shall be required to pay to the Company or any Affiliate, and the Company or any Affiliate shall have the
right and is hereby authorized to withhold, from any cash, shares of Common Stock, other securities or other property deliverable under any Award or from any compensation or other amounts owing to a Participant, the amount (in cash, Common Stock,
other securities or other property) of any required withholding or any other applicable taxes in respect of an Award, its exercise, or any payment or transfer under an Award or under the Plan and to take such other action as may be necessary in the
opinion of the Committee or the Company to satisfy all obligations for the payment of such withholding or any other applicable taxes. 

(ii) Without limiting the generality of clause (i) above, the Committee may, in its sole discretion, permit a Participant
to satisfy, in whole or in part, the foregoing withholding liability by (A) the delivery of shares of Common Stock (which are not subject to any pledge or other security interest) owned by the Participant having a Fair Market Value equal to
such withholding liability or (B) having the Company withhold from the number of shares of Common Stock otherwise issuable or deliverable pursuant 

  
 27 

 
to the exercise or settlement of the Award a number of shares with a Fair Market Value equal to such withholding liability, provided that with respect to shares withheld pursuant to clause (B),
the number of such shares may not have a Fair Market Value greater than the minimum required statutory withholding liability. 
 (e) No
Claim to Awards; No Rights to Continued Employment; Waiver. No employee of the Company or an Affiliate, or other person, shall have any claim or right to be granted an Award under the Plan or, having been selected for the grant of an Award, to
be selected for a grant of any other Award. There is no obligation for uniformity of treatment of Participants or holders or beneficiaries of Awards. The terms and conditions of Awards and the Committee’s determinations and interpretations with
respect thereto need not be the same with respect to each Participant and may be made selectively among Participants, whether or not such Participants are similarly situated. Neither the Plan nor any action taken hereunder shall be construed as
giving any Participant any right to be retained in the employ or service of the Company or an Affiliate, nor shall it be construed as giving any Participant any rights to continued service on the Board. The Company or any of its Affiliates may at
any time dismiss a Participant from employment or discontinue any consulting relationship, free from any liability or any claim under the Plan, unless otherwise expressly provided in the Plan or any Award agreement. By accepting an Award under the
Plan, a Participant shall thereby be deemed to have waived any claim to continued exercise or vesting of an Award or to damages or severance entitlement related to non-continuation of the Award beyond the period provided under the Plan or any Award
agreement, except to the extent of any provision to the contrary in any written employment contract or other agreement between the Company and its Affiliates and the Participant, whether any such agreement is executed before, on or after the Date of
Grant. 
 (f) International Participants. With respect to Participants who reside or work outside of the United States of America and
who are not (and who are not expected to be) “covered employees” within the meaning of Section 162(m) of the Code, the Committee may in its sole discretion amend the terms of the Plan or Sub-Plans or outstanding Awards with respect to
such Participants in order to conform such terms with the requirements of local law or to obtain more favorable tax or other treatment for a Participant, the Company or its Affiliates. 

(g) Designation and Change of Beneficiary. Each Participant may file with the Committee a written designation of one or more persons as
the beneficiary(ies) who shall be entitled to receive the amounts payable with respect to an Award, if any, due under the Plan upon his or her death. A Participant may, from time to time, revoke or change his or her beneficiary designation without
the consent of any prior beneficiary by filing a new designation with the Committee. The last such designation received by the Committee shall be controlling; provided, however, that no designation, or change or revocation thereof, shall be
effective unless received by the Committee prior to the Participant’s death, and in no event shall it be effective as of a date prior to such receipt. If no beneficiary designation is filed by a Participant, the beneficiary shall be deemed to
be his or her spouse or, if the Participant is unmarried at the time of death, his or her estate. 
 (h) Termination. Except as
otherwise provided in an Award agreement, unless determined otherwise by the Committee at any point following such event: (i) neither a temporary absence from employment or service due to illness, vacation or leave of absence

  
 28 

 
(including, without limitation, a call to active duty for military service through a Reserve or National Guard unit) nor a transfer from employment or service with one Service Recipient to
employment or service with another Service Recipient (or vice-versa) shall be considered a Termination; and (ii) if a Participant undergoes a Termination of employment, but such Participant continues to provide services to the Company and its
Affiliates in a non-employee capacity, such change in status shall not be considered a Termination for purposes of the Plan. Further, unless otherwise determined by the Committee, in the event that any Service Recipient ceases to be an Affiliate of
the Company (by reason of sale, divestiture, spin-off, or other similar transaction), unless a Participant’s employment or service is transferred to another entity that would constitute a Service Recipient immediately following such
transaction, such Participant shall be deemed to have suffered a Termination hereunder as of the date of the consummation of such transaction. 

(i) No Rights as a Stockholder. Except as otherwise specifically provided in the Plan or any Award agreement, no person shall be
entitled to the privileges of ownership in respect of shares of Common Stock which are subject to Awards hereunder until such shares have been issued or delivered to that person. 

(j) Government and Other Regulations. 

(i) The obligation of the Company to settle Awards in shares of Common Stock or other consideration shall be subject to all
applicable laws, rules, and regulations, and to such approvals by governmental agencies as may be required. Notwithstanding any terms or conditions of any Award to the contrary, the Company shall be under no obligation to offer to sell or to sell,
and shall be prohibited from offering to sell or selling, any shares of Common Stock pursuant to an Award unless such shares have been properly registered for sale pursuant to the Securities Act with the Securities and Exchange Commission or unless
the Company has received an opinion of counsel (if the Company has requested such an opinion), satisfactory to the Company, that such shares may be offered or sold without such registration pursuant to an available exemption therefrom and the terms
and conditions of such exemption have been fully complied with. The Company shall be under no obligation to register for sale under the Securities Act any of the shares of Common Stock to be offered or sold under the Plan. The Committee shall have
the authority to provide that all shares of Common Stock or other securities of the Company or any Affiliate delivered under the Plan shall be subject to such stop transfer orders and other restrictions as the Committee may deem advisable under the
Plan, the applicable Award agreement, the Federal securities laws, or the rules, regulations and other requirements of the Securities and Exchange Commission, any securities exchange or inter- dealer quotation system on which the securities of the
Company are listed or quoted and any other applicable Federal, state, local or non-U.S. laws, rules, regulations and other requirements, and, without limiting the generality of Section 9 of the Plan, the Committee may cause a legend or legends
to be put on certificates representing shares of Common Stock or other securities of the Company or any Affiliate delivered under the Plan to make appropriate reference to such restrictions or may cause such Common Stock or other securities of the
Company or any Affiliate delivered under the Plan in book-entry form to be held subject to the Company’s instructions or subject to appropriate stop-transfer orders. Notwithstanding any provision

  
 29 

 
in the Plan to the contrary, the Committee reserves the right to add any additional terms or provisions to any Award granted under the Plan that it in its sole discretion deems necessary or
advisable in order that such Award complies with the legal requirements of any governmental entity to whose jurisdiction the Award is subject. 

(ii) The Committee may cancel an Award or any portion thereof if it determines, in its sole discretion, that legal or
contractual restrictions and/or blockage and/or other market considerations would make the Company’s acquisition of shares of Common Stock from the public markets, the Company’s issuance of Common Stock to the Participant, the
Participant’s acquisition of Common Stock from the Company and/or the Participant’s sale of Common Stock to the public markets, illegal, impracticable or inadvisable. If the Committee determines to cancel all or any portion of an Award in
accordance with the foregoing, the Company shall pay to the Participant an amount equal to the excess of (A) the aggregate Fair Market Value of the shares of Common Stock subject to such Award or portion thereof canceled (determined as of the
applicable exercise date, or the date that the shares would have been vested or delivered, as applicable), over (B) the aggregate Exercise Price or Strike Price (in the case of an Option or SAR, respectively) or any amount payable as a
condition of delivery of shares of Common Stock (in the case of any other Award). Such amount shall be delivered to the Participant as soon as practicable following the cancellation of such Award or portion thereof. 

(k) No Section 83(b) Elections Without Consent of Company. Except with respect to OP Units, no election under Section 83(b)
of the Code or under a similar provision of law may be made unless expressly permitted by the terms of the applicable Award agreement or by action of the Committee in writing prior to the making of such election. If a Participant, in connection with
the acquisition of shares of Common Stock or OP Units under the Plan or otherwise, is expressly permitted to make such election and the Participant makes the election, the Participant shall notify the Company of such election within ten days of
filing notice of the election with the Internal Revenue Service or other governmental authority, in addition to any filing and notification required pursuant to Section 83(b) of the Code or other applicable provision. 

(l) Payments to Persons Other Than Participants. If the Committee shall find that any person to whom any amount is payable under the
Plan is unable to care for his or her affairs because of illness or accident, or is a minor, or has died, then any payment due to such person or his or her estate (unless a prior claim therefor has been made by a duly appointed legal representative)
may, if the Committee so directs the Company, be paid to his or her spouse, child, relative, an institution maintaining or having custody of such person, or any other person deemed by the Committee to be a proper recipient on behalf of such person
otherwise entitled to payment. Any such payment shall be a complete discharge of the liability of the Committee and the Company therefor. 

(m) Nonexclusivity of the Plan. Neither the adoption of this Plan by the Board nor the submission of this Plan to the stockholders of
the Company for approval shall be construed as creating any limitations on the power of the Board to adopt such other incentive arrangements as it may deem desirable, including, without limitation, the granting of stock options otherwise than under
this Plan, and such arrangements may be either applicable generally or only in specific cases. 

  
 30 

 (n) No Trust or Fund Created. Neither the Plan nor any Award shall create or be construed
to create a trust or separate fund of any kind or a fiduciary relationship between the Company or any Affiliate, on the one hand, and a Participant or other person or entity, on the other hand. No provision of the Plan or any Award shall require the
Company, for the purpose of satisfying any obligations under the Plan, to purchase assets or place any assets in a trust or other entity to which contributions are made or otherwise to segregate any assets, nor shall the Company maintain separate
bank accounts, books, records or other evidence of the existence of a segregated or separately maintained or administered fund for such purposes. Participants shall have no rights under the Plan other than as unsecured general creditors of the
Company, except that insofar as they may have become entitled to payment of additional compensation by performance of services, they shall have the same rights as other employees under general law. 

(o) Reliance on Reports. Each member of the Committee and each member of the Board shall be fully justified in acting or failing to
act, as the case may be, and shall not be liable for having so acted or failed to act in good faith, in reliance upon any report made by the independent public accountant of the Company and its Affiliates and/or any other information furnished in
connection with the Plan by any agent of the Company or the Committee or the Board, other than himself. 
 (p) Relationship to Other
Benefits. No payment under the Plan shall be taken into account in determining any benefits under any pension, retirement, profit sharing, group insurance or other benefit plan of the Company except as otherwise specifically provided in such
other plan or as required by applicable law. 
 (q) Governing Law. The Plan shall be governed by and construed in accordance with the
internal laws of the State of Delaware (or, if the Company or its successor hereunder ceases to be organized in Delaware, then the internal laws of the state or other jurisdiction of incorporation) applicable to contracts made and performed wholly
within the State of Delaware (or such other jurisdiction described above), without giving effect to the conflict of laws provisions thereof. 

(r) Severability. If any provision of the Plan or any Award or Award agreement is or becomes or is deemed to be invalid, illegal, or
unenforceable in any jurisdiction or as to any person or entity or Award, or would disqualify the Plan or any Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to the applicable
laws, or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan or the Award, such provision shall be construed or deemed stricken as to such jurisdiction, person or
entity or Award and the remainder of the Plan and any such Award shall remain in full force and effect. 
 (s) Obligations Binding on
Successors. The obligations of the Company under the Plan shall be binding upon any successor corporation or organization resulting from the merger, consolidation or other reorganization of the Company, or upon any successor corporation or
organization succeeding to substantially all of the assets and business of the Company. 

  
 31 

 (t) 409A of the Code. 

(i) Notwithstanding any provision of the Plan to the contrary, it is intended that the provisions of this Plan comply with
Section 409A of the Code, and all provisions of this Plan shall be construed and interpreted in a manner consistent with the requirements for avoiding taxes or penalties under Section 409A of the Code. Each Participant is solely
responsible and liable for the satisfaction of all taxes and penalties that may be imposed on or in respect of such Participant in connection with this Plan or any other plan maintained by the Company (including any taxes and penalties under
Section 409A of the Code), and neither the Company nor any Affiliate shall have any obligation to indemnify or otherwise hold such Participant (or any beneficiary) harmless from any or all of such taxes or penalties. With respect to any Award
that is considered “deferred compensation” subject to Section 409A of the Code, references in the Plan to “termination of employment” (and substantially similar phrases) shall mean “separation from service” within
the meaning of Section 409A of the Code. For purposes of Section 409A of the Code, each of the payments that may be made in respect of any Award granted under the Plan is designated as separate payments. 

(ii) Notwithstanding anything in the Plan to the contrary, if a Participant is a “specified employee” within the
meaning of Section 409A(a)(2)(B)(i) of the Code, no payments in respect of any Awards that are “deferred compensation” subject to Section 409A of the Code and which would otherwise be payable upon the Participant’s
“separation from service” (as defined in Section 409A of the Code) shall be made to such Participant prior to the date that is six months after the date of such Participant’s “separation from service” or, if earlier,
the Participant’s date of death. Following any applicable six month delay, all such delayed payments will be paid in a single lump sum on the earliest date permitted under Section 409A of the Code that is also a business day. 

(iii) Unless otherwise provided by the Committee in an Award agreement or otherwise, in the event that the timing of payments
in respect of any Award (that would otherwise be considered “deferred compensation” subject to Section 409A of the Code) would be accelerated upon the occurrence of (A) a Change in Control, no such acceleration shall be permitted
unless the event giving rise to the Change in Control satisfies the definition of a change in the ownership or effective control of a corporation, or a change in the ownership of a substantial portion of the assets of a corporation pursuant to
Section 409A of the Code and any Treasury Regulations promulgated thereunder or (B) a Disability, no such acceleration shall be permitted unless the Disability also satisfies the definition of “Disability” pursuant to
Section 409A of the Code and any Treasury Regulations promulgated thereunder. 
 (u) Clawback/Forfeiture. Notwithstanding
anything to the contrary contained herein, an Award agreement may provide that the Committee may in its sole discretion cancel such Award if the Participant, without the consent of the Company, while employed by or providing services to the Company
or any Affiliate or after Termination, violates a non-competition, non-solicitation or non-disclosure covenant or agreement or otherwise has engaged in or engages in other Detrimental Activity that is in conflict with or adverse to the interests of
any Affiliate, including fraud or conduct contributing to any financial restatements or 

  
 32 

 
irregularities, as determined by the Committee in its sole discretion. The Committee may also provide in an Award agreement that if the Participant otherwise has engaged in or engages in any
activity referred to in the preceding sentence, the Participant will forfeit any gain realized on the vesting or exercise of such Award, and must repay the gain to the Company. The Committee may also provide in an Award agreement that if the
Participant receives any amount in excess of what the Participant should have received under the terms of the Award for any reason (including without limitation by reason of a financial restatement, mistake in calculations or other administrative
error), then the Participant shall be required to repay any such excess amount to the Company. Without limiting the foregoing, all Awards shall be subject to reduction, cancellation, forfeiture or recoupment to the extent necessary to comply with
applicable law. 
 (v) Expenses; Gender; Titles and Headings. The expenses of administering the Plan shall be borne by the Company
and its Affiliates. Masculine pronouns and other words of masculine gender shall refer to both men and women. The titles and headings of the sections in the Plan are for convenience of reference only, and in the event of any conflict, the text of
the Plan, rather than such titles or headings shall control. 

  
 33EX-10.7

 Exhibit 10.7 

Summit Materials, Inc. 

RESTRICTED LP UNIT AGREEMENT 

THIS RESTRICTED LP UNIT AGREEMENT (the “Agreement”), is made effective as of the date set forth on the signature page (the
“Signature Page”) attached hereto, between Summit Materials, Inc., a Delaware corporation (together with its successors and assigns, the “Company”), Summit Materials Holdings L.P., a Delaware limited partnership
(the “Partnership”), and the participant identified on the Signature Page attached hereto (the “Participant”). 

R E C I T A L S: 
 WHEREAS, the
Participant holds a number of Class D-1 Interests and Class D-2 Interests (the “Interests”) of the Partnership specified on the signature page hereto, which Interests were issued pursuant to one or more Management Subscription
Agreements (collectively, the “Subscription Agreements”); 
 WHEREAS, pursuant to an IPO Reorganization Agreement, a
reorganization of the various classes of interests of the Partnership (the “Reclassification”), was or will be effected on or about the pricing of the initial public offering (the “IPO”) of the Class A common
stock of the Company (the “Summit Shares”, the date of such Reclassification, the “Date of Grant”); and 

WHEREAS, as of the Reclassification, the Interests will cease to be issued and outstanding and the Participant will hold LP Units with an
equivalent value based on the IPO Price (as defined below), on the terms described herein and otherwise subject to the terms of the Summit Materials, Inc. 2015 Omnibus Incentive Plan (the “Plan”) (and capitalized terms used and not
defined herein shall have the meaning ascribed to such terms in the Plan). 
 NOW THEREFORE, in consideration of the mutual covenants
hereinafter set forth, the parties agree as follows: 
 1. LP Units. 

(a) The LP Units. 

(i) Subject to the terms and conditions of the Plan and the additional terms and conditions set forth in this Agreement and
effective as of the Reclassification, the Company and the Partnership will cause the Interests to be reclassified as the number of vested LP Units (“Vested LP Units”) and unvested LP Units (the “Unvested LP Units”)
to be specified by the General Partner of the Partnership (or its authorized designee, the “Committee”) on the Signature Page hereto (the Vested LP Units and Unvested LP Units collectively, the “LP Units”). 

(ii) The number of LP Units shall be calculated by the Committee in its sole discretion, such that the intrinsic value of all
such LP Units (calculated based on the price at which Summit Shares are sold in the Company’s initial public offering (the “IPO Price”), the number of such Interests held by the Participant prior to the Reclassification, and
the relative rights and priorities applicable to the Interests under the Partnership’s organizational documents immediately prior to the Reclassification) is equal to the 

 LP Unit Agreement 

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intrinsic value of all such LP Units using the IPO Price, in each case as calculated by the Committee. Any fractional Vested LP Units or Unvested LP Units will be canceled for no consideration.

 (b) Stock Options. Effective as of and in connection with the Reclassification, the Company will grant options to acquire Summit
Shares (“Options”) to the Participant, pursuant to a Nonqualified Stock Option Agreement, in a number and on such terms as determined by the Compensation Committee of the Board of Directors of the Company (the
“Committee”). 
 (c) Vesting. The Vested LP Units shall not be subject to any vesting conditions. The Unvested LP Units
shall vest and become nonforfeitable Vested LP Units in accordance with Schedule I attached hereto. If Participant’s employment with the Company and its subsidiaries is terminated at any time, all Unvested LP Units shall automatically and
immediately be forfeited and canceled (after giving effect to any acceleration of vesting or other terms set forth in Schedule I attached hereto). 

(d) Section 83(b) Election. Within 10 days after the Reclassification, the Participant shall provide the Company with a copy of a
completed election under Section 83(b) of the Internal Revenue Code of 1986, as amended (the “Code”), and the regulations promulgated thereunder in the form of Exhibit A attached hereto. The Participant shall timely (within 30
days) file (via certified mail, return receipt requested) such election with the Internal Revenue Service, and thereafter shall certify to the Company that the Participant has made such timely filing and furnish a copy of such filing to the Company.
The Participant should consult his or her tax advisor regarding the consequences of a Section 83(b) election, as well as the receipt, vesting, holding and sale of the LP Units. Participant agrees to properly execute and provide to the
Partnership in a timely manner any tax documentation that may be reasonably required by the Partnership, including any tax forms relating to a “consent dividend” (as defined in Section 565 of the Code) or a power of attorney relating
to such consent dividends. 
 (e) Participant acknowledges that the LP Units have not been registered under the Securities Act of 1933, as
amended (the “Securities Act”) or any other state or foreign securities law, and accordingly, may not be offered, sold or transferred except pursuant to an effective registration statement under the Securities Act or pursuant to an
applicable exemption therefrom and in compliance with the Fourth Amended and Restated Limited Partnership Agreement of the Partnership as it may be amended from time to time (the “LP Agreement”). By executing this Agreement,
Participant shall be deemed to have also executed and become a party to, as a “Holder”, the Exchange Agreement substantially in the form attached as Exhibit B (the “Exchange Agreement”), pursuant to which LP Units will be
exchangeable into Summit Shares from time to time (in accordance with the terms of the Exchange Agreement). Moreover, the Company hereby agrees to use commercially reasonable efforts to file and cause to become effective a registration statement
with the Securities and Exchange Commission that will permit Participant (subject to any limitations to which Participant may be subject as an “affiliate” of Summit) to freely resell any Summit Shares received upon any exchange under the
Exchange Agreement. 
 2. Prior Agreements; Restrictive Covenants. 

(a) Restrictive Covenants. Participant acknowledges and recognizes the highly competitive nature of the businesses of the Company and
its Affiliates and accordingly agrees, in 

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his capacity as an investor and equityholder in the Company and its Affiliates, to the provisions of Appendix A to this Agreement (the “Restrictive Covenants”). Participant
acknowledges and agrees that the Company’s remedies at law for a breach or threatened breach of any of the provisions of Appendix A would be inadequate and the Company would suffer irreparable damages as a result of such breach or threatened
breach. In recognition of this fact, Participant agrees that, in the event of such a breach or threatened breach, in addition to any remedies at law, the Company, without posting any bond, shall be entitled to cease making any payments or providing
any benefit otherwise required by this Agreement or any other agreement between the Company and its Affiliates, on the one hand, and Participant and Participant’s Affiliates, on the other, and obtain equitable relief in the form of specific
performance, temporary restraining order, temporary or permanent injunction or other equitable remedy which may then be available. For the avoidance of doubt, the Restrictive Covenants contained in this Agreement are in addition to, and not in lieu
of, any other restrictive covenants or similar covenants or agreements between the Participant and the Company or any of its Affiliates. For purposes of this Agreement, “Restrictive Covenant Violation” means the Participant’s breach
of any of the Restrictive Covenants or any similar provision applicable to the Participant. 
 (b) Repayment of Proceeds.
Notwithstanding any provision of Section 15(u) of the Plan to the contrary, in the event of a Restrictive Covenant Violation or the Company discovers after a termination of employment that grounds for a termination of employment with Cause
existed at the time thereof, then Participant shall be required, in addition to any other remedy available (on a non-exclusive basis), to pay to the Company, within 10 business days of the Company’s request to Participant therefor, an amount
equal to the excess, if any, of (i) the aggregate after-tax proceeds (taking into account all amounts of tax that would be recoverable upon a claim of loss for payment of such proceeds in the year of repayment) Participant received
(A) upon the sale or other disposition of, or distributions in respect of the LP Units issued hereunder (and any Summit Shares received in exchange for such LP Units), and (B) upon the exercise of any stock options issued in connection
with, the Reclassification, over (ii) the aggregate Cost of such LP Units, Summit Shares, or stock options. For purposes of this Agreement, “Cost” means, in respect of any LP Unit or Summit Share, the amount paid by Participant
for the Interests that were converted into such LP Unit or Summit Share, as proportionately adjusted for all subsequent distributions on the LP Unit or Summit Share and other recapitalizations; provided that Cost may not be less than zero.
Any reference in this Agreement to grounds existing for a termination of employment with Cause shall be determined without regard to any notice period, cure period, or other procedural delay or event required prior to finding of or termination with,
Cause. Without limiting the foregoing, the LP Units shall be subject to reduction, cancellation, forfeiture or recoupment to the extent necessary to comply with applicable law. 

3. Book Entry; Certificates. The Company shall recognize the Participant’s ownership of LP Units through uncertificated book
entry. If elected by the Company, certificates evidencing the LP Units may be issued by the Company and any such certificates shall be registered in the Participant’s name on the stock transfer books of the Company promptly after the date
hereof, but shall remain in the physical custody of the Company or its designee at all times prior to the later of (x) the vesting of Unvested LP Units pursuant to this Agreement and (y) the expiration of any transfer restrictions set
forth in this Agreement or otherwise applicable to the LP Units. As soon as practicable following such time, any certificates for the LP Units shall be delivered to the Participant or to the Participant’s legal guardian or representative along
with the 

 LP Unit Agreement 

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stock powers relating thereto. No certificates shall be issued for fractional LP Units. To the extent required by the Company, the Participant shall deliver to the Company a stock power, duly
endorsed in blank, relating to the LP Units that have not previously vested. However, the Company shall not be liable to the Participant for damages relating to any delays in issuing the certificates (if any) to the Participant, any loss by the
Participant of the certificates, or any mistakes or errors in the issuance of the certificates or in the certificates themselves. 
 4.
Rights as a Limited Partner. The Participant shall be the record owner of the LP Units until or unless such LP Units are forfeited pursuant to the terms of this Agreement or are transferred in accordance with the Partnership Agreement, and as
record owner shall be entitled to all rights of a holder of units of limited partner interests in the Partnership, including, without limitation, any voting rights with respect to the Unvested LP Units and rights to dividends or other distributions
that are expressly provided for by the LP Agreement; provided that (a) any cash or in kind dividends or distributions paid with respect of any Unvested LP Unit shall be accumulated by the Partnership and shall be paid to the Participant
only when, and if, such LP Unit shall become vested pursuant to the terms of this Agreement, and (b) the LP Units shall be subject to the limitations on transfer and encumbrance set forth in Section 7 hereof and in the LP Agreement. 

5. Legend. To the extent applicable, all book entries (or certificates, if any) representing the LP Units delivered to the Participant
as contemplated by Section 3 above shall be subject to the rules, regulations, and other requirements of the Securities and Exchange Commission, any stock exchange upon which such LP Units are listed, and any applicable Federal or state laws,
and the Company may cause notations to be made next to the book entries (or a legend or legends put on certificates, if any) to make appropriate reference to such restrictions. Any such book entry notations (or legends on certificates, if any) shall
include a description to the effect of the restrictions set forth in Sections 1 and 7 hereof. 
 6. No Right to Continued Employment.
Neither the Plan nor this Agreement nor the Participant’s receipt of the LP Units hereunder shall impose any obligation on the Company or any Affiliate to continue any employment or engagement of any Participant. Further, the Company or any
Affiliate (as applicable) may at any time terminate the employment or engagement of such Participant, free from any liability or claim under the Plan or this Agreement, except as otherwise expressly provided herein. 

7. Assignment Restrictions; Lock-up. 

(a) The Unvested LP Units may not, at any time prior to becoming vested pursuant to the terms of this Agreement, be Assigned (and any such
purported Assignment shall be void and unenforceable against the Company or any Affiliate), except that (i) Vested LP Units may, subject to the following provisions, be exchanged for Summit Shares pursuant to the Exchange Agreement and
(ii) LP Units may be transferred in accordance with Section 7(b) below and the LP Agreement. Unvested LP Units may not, at any time prior to becoming vested pursuant to the terms of this Agreement, be exchanged; provided that the
designation of a beneficiary shall not constitute an Assignment. 
 (b) Prior to the transfer of LP Units to a Permitted Transferee,
Participant shall deliver to the Partnership a written agreement of the proposed transfer (i) evidencing such Person’s 

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undertaking to be bound by the terms of this Agreement and the LP Agreement and (ii) acknowledging that the LP Units transferred to such Person will continue to be LP Units for purposes of
this Agreement in the hands of such Person. Any transfer or attempted transfer of LP Units in violation of any provision of this Agreement or the LP Agreement shall be void, and the Participant shall not record such transfer on its books or treat
any purported transferee of such LP Units as the owner of such LP Units for any purpose. 
 (c) Participant further hereby agrees that
Participant shall, without further action on the part of Participant, be bound by the provisions of the lock-up letter executed by the executive officers and directors of the Company to the same extent as if Participant had directly executed such
lock-up letter himself or herself. Such lock-up letter will provide that Participant shall not, subject to specified exceptions, not to offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of
any Summit Shares, or any options or warrants to purchase any Summit Shares, or any securities convertible into, exchangeable for or that represent the right to receive Summit Shares, whether now owned or hereinafter acquired during the period from
the date of the final prospectus relating to the IPO and continuing through the date 180 days after the date of such prospectus, except with the prior written consent of the representatives of the underwriters for the IPO. The 180-day restricted
period described in the preceding sentence will be automatically extended if: (1) during the last 17 days of the 180-day lock-up period referred to above, the Company issues an earnings release or material news or a material event relating to
the Company occurs; or (2) prior to the expiration of the 180-day lock-up period, the Company announces that it will release earnings results or becomes aware of a material event occurring during the 15-day period beginning on the last day of
the 180-day lock-up period, the restrictions described above shall continue to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of the material news or material event, unless the
representatives of the underwriters for the IPO waive such extension. 
 8. Withholding. The Participant may be required to pay to
the Company or any Affiliate and the Company shall have the right and is hereby authorized to withhold, any applicable withholding taxes in respect of the LP Units, their grant or vesting or any payment or transfer with respect to the LP Units at
the minimum applicable statutory rates, and to take such action as may be necessary in the opinion of the Committee to satisfy all obligations for the payment of such withholding taxes. 

9. Securities Laws; Cooperation. Upon the vesting of any Unvested LP Units, the Participant will make or enter into such written
representations, warranties and agreements as the Committee may reasonably request in order to comply with applicable securities laws, the Plan or with this Agreement. Participant further agrees to cooperate with the Company in taking any action
reasonably necessary or advisable to consummate the transactions contemplated by this Agreement. 

 LP Unit Agreement 

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 10. Notices. All notices and other communications hereunder shall be in writing and
shall be deemed to have been duly given when delivered by hand or overnight courier or three postal delivery days after it has been mailed by United States registered mail, return receipt requested, postage prepaid, addressed as set forth in the LP
Agreement, or to such other address as either party may have furnished to the other in writing in accordance herewith, except that notice of change of address shall be effective only upon receipt. 

11. Choice of Law; Jurisdiction; Venue. This Agreement shall be governed by and construed in accordance with the laws of the State of
Delaware. Any suit, action or proceeding with respect to this Agreement, or any judgment entered by any court in respect of any thereof, shall be brought in any court of competent jurisdiction specified in the LP Agreement. The Participant and the
Company hereby irrevocably waives (i) any objections which it may now or hereafter have to the laying of the venue of any suit, action or proceeding arising out of or relating to this Agreement brought in any court of competent jurisdiction in
any jurisdiction specified in the LP Agreement, (ii) any claim that any such suit, action or proceeding brought in any such court has been brought in any inconvenient forum and (iii) any right to a jury trial. 

12. LP Units Subject to Plan; Amendment. By entering into this Agreement, the Participant agrees and acknowledges that the Participant
has received and read a copy of the Plan. The LP Units granted hereunder are not issued pursuant to the Plan, but shall be subject to all the terms and conditions set forth in the Plan, as though the LP Units were issued as LP Units under the Plan.
The terms and provisions of the Plan, as it may be amended from time to time, are hereby incorporated herein by reference mutatis mutandis. In the event of a conflict between any term or provision contained herein and a term or provision of
the Plan, the applicable terms and provisions of the Agreement will govern and prevail. The Committee may waive any conditions or rights under, amend any terms of, or alter, suspend, discontinue, cancel or terminate this Agreement, but no such
waiver, amendment, alteration, suspension, discontinuance, cancellation or termination shall materially adversely affect the rights of the participant hereunder without the consent of the Participant. Notwithstanding anything in this Agreement or
the Plan to the contrary, the Company may amend and update the number of LP Units in the Schedule set forth on the Signature Page hereto prior to or following the effective date of the IPO based on the IPO Price. 

13. Other Awards. Subject to Section 2, this Agreement, together with any other equity grants received in connection with the
Reclassification and the IPO, are in replacement of, and supersede in all respects, the Interests. 
 14. Award Administrator. The
Partnership and/or the Company may from time to time designate a third party (an “Award Administrator”) to assist the Partnership and/or the Company in the implementation, administration and management of the LP Units subject to
this Agreement. 
 15. Data Privacy Consent. The Participant hereby explicitly and unambiguously consents to the collection, use and
transfer, in electronic or other form, of the Participant’s personal data as described in this Agreement and any other Option grant materials by and among, as applicable, the Participant’s employer or contracting party (the
“Employer”) and the Company for the exclusive purpose of implementing, administering and managing the Participant’s participation in the Plan. The Participant understands that the Company may hold 

 LP Unit Agreement 

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certain personal information about the Participant, including, but not limited to, the Participant’s name, home address and telephone number, work location and phone number, date of birth,
social insurance number or other identification number, salary, nationality, job title, hire date, any shares of stock or directorships held in the Company, details of all awards or any other entitlement to shares awarded, cancelled, exercised,
vested, unvested or outstanding in the Participant’s favor, for the purpose of implementing, administering and managing the Plan (“Personal Data”). The Participant understands that Personal Data may be transferred to any third
parties assisting in the implementation, administration and management of the Plan, now or in the future, that these recipients may be located in the Participant’s country or elsewhere, and that the recipient’s country may have different
data privacy laws and protections than the Participant’s country. The Participant understands that the Participant may request a list with the names and addresses of any potential recipients of the Personal Data by contacting the
Participant’s local human resources representative. The Participant authorizes the recipients to receive, possess, use, retain and transfer the Personal Data, in electronic or other form, for the purposes of implementing, administering and
managing the Participant’s participation in the Plan. The Participant understands that Personal Data will be held only as long as is necessary to implement, administer and manage the Participant’s participation in the Plan. The Participant
understands that the Participant may, at any time, view Personal Data, request additional information about the storage and processing of Personal Data, require any necessary amendments to Personal Data or refuse or withdraw the consents herein, in
any case without cost, by contacting in writing the Participant’s local human resources representative. Further, the Participant understands that the Participant is providing the consents herein on a purely voluntary basis. If the Participant
does not consent, or if the Participant later seeks to revoke the Participant’s consent, the Participant’s employment status or service and career with the Employer will not be adversely affected; the only consequence of the
Participant’s refusing or withdrawing the Participant’s consent is that the Company would not be able to grant Options or other equity awards to the Participant or administer or maintain such awards. Therefore, the Participant understands
that refusing or withdrawing the Participant’s consent may affect the Participant’s ability to participate in the Plan. For more information on the consequences of Participant’s refusal to consent or withdrawal of consent, the
Participant understands that the Participant may contact the Participant’s local human resources representative. 
 [Signatures on next
page.] 

 IN WITNESS WHEREOF, the Participant acknowledges and accepts the terms of this Agreement which
shall be effective as of the date set forth below and countersignature by the Company. 
  

	
	Participant
	
	 
	
	Name (printed):
	Dated:
                                         
           

 [Signature Page - Replacement Award for Units of Summit Materials Holdings, L.P.] 

 Agreement acknowledged and confirmed: 
  

					
	SUMMIT MATERIALS HOLDINGS L.P.	 		 	SUMMIT MATERIALS, INC.
			
	  
 By:

 
	 		 	  
 By:

 

	 Name:
 Title: Authorized Signatory
	 		 	 Name:
 Title: Authorized
Signatory

			
	 SUMMIT MATERIALS HOLDINGS GP,

LTD., as current general partner of
 Summit Materials
Holdings L.P.
	 		 	 SUMMIT OWNER HOLDCO, LLC, as

interim general partner of Summit
 Materials Holdings
L.P.

			
	   
	 		 	  
 By: Summit Materials Holdings GP, Ltd., its
managing member

 

	 Name:
 Title: Authorized Signatory
	 		 	 Name:
 Title: Authorized
Signatory

			
	 SUMMIT MATERIALS, INC., as new

general partner of Summit Materials
 Holdings
L.P.
	 		 	
			
	  
 By:

 
	 		 	  

	 Name:
 Title: Authorized Signatory
	 		 	

 Schedule 

Name: 
 Vesting Start Date for Time-Vesting LP Units:

 Date of Grant: 
  

									
	 Pre-Reclassification
	  	Post-Reclassification
	 	  	Vested
Interests
(#)	  	Unvested
Interests
(#)	  	Vested LP
Units
(#)	  	Unvested LP
Units
(#)
	 Class D-1 Time Vesting Interests
	  		  		  		  	
	 Class D-1 Performance Vesting Interests
	  		  		  		  	
	 Class D-2 Performance Vesting Interests
	  		  		  		  	
	 Total
	  		  		  		  	

 Total Unvested Units: 

Time-Vesting Unvested LP Units: 

1.75x MOIC Performance-Vesting Unvested LP Units: 

3.00x MOIC Performance-Vesting Unvested LP Units: 

 Summit Materials, Inc. 

Schedule I-1 
 Schedule I 

Vesting Terms 
 1.
Time-Based Vesting LP Units. 
 (a) With regard to the LP Units granted hereunder and designated “Time-Vesting Unvested LP Units”
on the signature page attached hereto, so long as the Participant’s employment with the Company and its Affiliates has not been terminated (the “Termination Date”), [20% of the Time-Vesting Unvested LP Units shall become vested
on the first anniversary of the Vesting Start Date, and an additional 1.667% of the Time-Vesting Unvested LP Units shall become vested on the last day of each month following such date] [
[            ] Time-Vesting Unvested LP Units shall become vested on the last day of each month following the Date of Grant], such that the Time-Vesting Interests will be fully vested on
the fifth anniversary of the Vesting Start Date. 
 (b) Notwithstanding the foregoing, immediately prior to, and following, the occurrence
of a change of control that occurs prior to the Participant’s Termination Date, 100% of the Time-Vesting Unvested LP Units that are Unvested LP Units shall become Vested LP Units. 

2. Performance-Based Vesting LP Units. 

(a) 1.75X MOIC-Vesting Terms. At any time prior to June 30, 2020 that the Sponsor shall have received aggregate cash proceeds
and/or has distributed to its limited partners marketable securities (in each case, not subject to any clawback, indemnity or similar contractual obligation) in respect of its LP Units in the Partnership equal to, or in the case of marketable
securities having a fair market value equal to, at least 175% of its aggregate Capital Contributions (as defined in the LP Agreement) in respect of such Units (the “1.75X Hurdle”), then all of the 1.75x MOIC Performance-Vesting
Unvested LP Units shall become Vested LP Units. 
 (b) 3.00X MOIC-Vesting Terms. At any time prior to June 30, 2020 that the
Sponsor shall have received aggregate cash proceeds and/or has distributed to its limited partners marketable securities (in each case, not subject to any clawback, indemnity or similar contractual obligation) in respect of its Units in the
Partnership equal to, or in the case of marketable securities having a fair market value equal to, at least 300% of its aggregate Capital Contributions in respect of such Units (the “3.00X Hurdle”), then all of the 3.00x MOIC
Performance-Vesting Unvested LP Units shall become Vested LP Units. 
 3. Forfeiture Upon Termination of Employment. 

(a) Any Time-Vesting Unvested LP Units that are Unvested LP Units on a Termination Date shall be immediately forfeited by the Participant.

 (b) Any 1.75x MOIC Performance-Vesting Unvested LP Units and 3.00x MOIC Performance-Vesting Unvested LP Units (collectively,
“Performance-Vesting LP Units”) that are Unvested LP Units on a Termination Date shall be immediately forfeited by the Participant; provided, however, that in the event a transaction closes before earlier of the
Termination Date or June 30, 2020 and a portion of the proceeds are subject to any clawback, indemnity or similar obligation, then the Performance-Vesting LP Units that are Unvested LP Units shall remain

 Summit Materials, Inc. 

Schedule I-2 
  

 
subject to additional vesting following such date until the effect of any clawback, indemnity or similar contractual obligation is finally determined (and shall vest at the time of such final
determination if the relevant hurdle is met); provided, further, that if the Participant is terminated without Cause or if the Participant has entered into a written employment agreement with the Company that includes a definition of
“good reason” or “constructive termination,” if the Participant resigns for “good reason” or “constructive termination” (as defined in such written employment agreement) within 12 months preceding a Change in
Control, any Performance-Vesting LP Units that would have vested in connection with such Change in Control shall be restored and shall be eligible to vest based on the terms hereof. 

 Summit Materials, Inc. 

Appendix A-1 
 Appendix A

 Restrictive Covenants 

1. Confidentiality; Non-Compete; Non-Solicit; Non-Disparagement. 

(a) For the purposes of this Appendix A, any reference to the “Company” shall mean the Company and its Subsidiaries and
Affiliates, collectively. In view of the fact that Participant’s work for the Company brings Participant into close contact with many confidential affairs of the Company not readily available to the public, and plans for further developments,
Participant agrees: 
 (i) Participant will not at any time (whether during or after Participant’s Employment with the
Company): (x) retain or use for the benefit, purposes or account of Participant or any other person; or (y) disclose, divulge, reveal, communicate, share, transfer or provide access to any person outside the Company (other than its
professional advisers who are bound by confidentiality obligations), any non-public, proprietary or confidential information – including without limitation trade secrets, know-how, research and development, software, databases, inventions,
processes, formulae, technology, designs and other intellectual property, information concerning finances, investments, profits, pricing, costs, products, services, vendors, customers, clients, partners, investors, personnel, compensation,
recruiting, training, advertising, sales, marketing, promotions, government and regulatory activities and approvals – concerning the past, current or future business, activities and operations of the Company, its Subsidiaries or Affiliates
and/or any third party that has disclosed or provided any of same to the Company on a confidential basis (“Confidential Information”) without the prior written authorization of the Board, except as specifically necessary during the
term of Participant’s Employment in order to perform the duties of his or her position and in the best interests of the Company. 

(ii) “Confidential Information” shall not include any information that is: (a) generally known to the industry
or the public other than as a result of Participant’s breach of this covenant or any breach of other confidentiality obligations by third parties; (b) made legitimately available to Participant by a third party without breach of any
confidentiality obligation; or (c) required by law to be disclosed; provided that Participant shall give prompt written notice to the Company of such requirement, disclose no more information than is so required, and cooperate with any
attempts by the Company to obtain a protective order or similar treatment. 
 (iii) Except as required by law, Participant
will not disclose to anyone, other than Participant’s immediate family and legal or financial advisors, the existence or contents of this Agreement; provided that Participant may disclose to any prospective future employer the provisions
of Section (b) of this Appendix provided they agree to maintain the confidentiality of such terms. 
 (iv) Upon
termination of Participant’s Employment with the Company for any reason, Participant shall (x) cease and not thereafter commence use of any Confidential Information or intellectual property (including without limitation, any patent,
invention, copyright, trade secret, trademark, trade name, logo, domain name or other source 

 Summit Materials, Inc. 

Appendix A-2 
  

 
indicator) owned or used by the Company, its Subsidiaries or Affiliates; (y) immediately destroy, delete, or return to the Company, at the Company’s option, all originals and copies in
any form or medium (including memoranda, books, papers, plans, computer files, letters and other data) in Participant’s possession or control (including any of the foregoing stored or located in Participant’s office, home, laptop or other
computer, whether or not Company property) that contain Confidential Information or otherwise relate to the business of the Company, its Affiliates and Subsidiaries, except that Participant may retain only those portions of any personal notes,
notebooks and diaries that do not contain any Confidential Information; and (z) notify and fully cooperate with the Company regarding the delivery or destruction of any other Confidential Information of which Participant is or becomes aware.

 (b) Participant acknowledges and recognizes the highly competitive nature of the businesses of the Company and its Affiliates and
accordingly agrees as follows: 
 (i) Participant will not, within twelve months following the termination of
Participant’s Employment with the Company or such shorter time as provided in Section 1(b)(iv) (the “Post-Termination Period”) or during Participant’s Employment (collectively with the Post-Termination Period, the
“Restricted Period”): 
 (A) engage in any business involved, either directly or indirectly, in (x) the
acquisition of companies primarily engaged in the U.S. and Canadian aggregates and related downstream product sectors (including, but not limited to, asphalt, paving, cement, concrete and concrete products) (any such company, a
“Business”) or (y) the operation of any Business (any such business as described in subclauses (x) or (y), a “Competitive Business”). 

(B) enter the employ of, or render any services to, any person (or any division or controlled or controlling affiliate of any
person) who or which engages in a Competitive Business; 
 (C) acquire a financial interest in, or otherwise become actively
involved with, any Competitive Business, directly or indirectly, as an individual, partner, shareholder, officer, director, principal, agent, trustee or consultant; or 

(D) interfere with, or attempt to interfere with, business relationships (whether formed before, on or after the date of this
Agreement) between the Company or any of its Affiliates and customers, clients, suppliers, partners, members, investors or acquisition targets. 

(ii) During the Restricted Period, Participant will not, whether on Participant’s own behalf or on behalf of or in
conjunction with any person, directly or indirectly: 
 (A) solicit or encourage any employee of the Company or its
Affiliates to leave the Employment of the Company or its Affiliates; or 

 Summit Materials, Inc. 

Appendix A-3 
  

 (B) hire any such employee who was employed by the Company or its Affiliates
as of the date of Participant’s termination of Employment with the Company or who left the Employment of the Company or its Affiliates coincident with, or within one year prior to or after, the termination of Participant’s Employment with
the Company. 
 (iii) During the Restricted Period, Participant will not, whether on Participant’s own behalf or on
behalf of or in conjunction with any person, directly or indirectly solicit or assist in soliciting in competition with the Company, the business of any client or prospective client: 

(A) with whom Participant had personal contact or dealings on behalf of the Company during the one-year period preceding
Participant’s termination of Employment; 
 (B) with whom employees reporting to Participant have had personal contact
or dealings on behalf of the Company during the one year immediately preceding Participant’s termination of Employment; or 

(C) for whom Participant had direct or indirect responsibility during the one year immediately preceding Participant’s
termination of Employment. 
 Notwithstanding anything to the contrary in this Agreement, Participant may, directly or indirectly own,
solely as an investment, securities of any person which are publicly traded on a national or regional stock exchange or on the over-the-counter market if Participant (i) is not a controlling person of, or a member of a group which controls,
such person and (ii) does not, directly or indirectly, own 5% or more of any class of securities of such person. 
 (c) During the
Restricted Period, Participant will not, directly or indirectly, solicit or encourage to cease to work with the Company or its Affiliates any consultant then under contract with the Company or its Affiliates. 

(d) Participant will not, other than as required by law or by order of a court or other competent authority, make or publish, or cause any
other person to make or publish, any statement that is disparaging or that reflects negatively upon the Company or its Affiliates, or that is or reasonably would be expected to be damaging to the reputation of the Company or its Affiliates. 

(e) It is expressly understood and agreed that although Participant and the Company consider the restrictions contained in this Appendix A to
be reasonable, if a final judicial determination is made by a court of competent jurisdiction, that the time or territory or any other restriction contained in this Agreement is an unenforceable restriction against Participant, the provisions of
this Agreement shall not be rendered void but shall be deemed amended to apply as to such maximum time and territory and to such maximum extent as such court may judicially determine or indicate to be enforceable. Alternatively, if any court of
competent jurisdiction finds that any restriction contained in this Agreement is unenforceable, and such restriction cannot be amended so as to make it enforceable, such finding shall not affect the enforceability of any of the other restrictions
contained herein. 

 Summit Materials, Inc. 

Appendix A-4 
  

 (f) The period of time during which the provisions of this Appendix A shall be in effect
shall be extended by the length of time during which Participant is in breach of the terms hereof as determined by any court of competent jurisdiction on the Company’s application for injunctive relief. 

2. Specific Performance; Survival. 

(a) Participant acknowledges and agrees that the Company’s remedies at law for a breach or threatened breach of any of the provisions of
this Appendix A would be inadequate and the Company would suffer irreparable damages as a result of such breach or threatened breach. In recognition of this fact, Participant agrees that, in the event of such a breach or threatened breach, in
addition to any remedies at law, the Company, without posting any bond, shall be entitled to suspend making any payments or providing any benefit otherwise required by this Agreement and obtain equitable relief in the form of specific performance,
temporary restraining order, temporary or permanent injunction or any other equitable remedy which may then be available. 
 (b) The
provisions of this Appendix A shall survive the termination of Participant’s Employment for any reason. 

 Exhibit A 

Section 83(b) Election 

[Separately Attached] 

 Exhibit B 

Form of Exchange Agreement 

[Separately Attached]

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