Document:

EX-10.3

 Exhibit 10.3 

REGISTRATION RIGHTS AGREEMENT 

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”) is entered into and dated March 31, 2015, by and among Willbros
Group, Inc., a Delaware corporation (the “Company”), KKR Credit Advisors (US) LLC, a Delaware limited liability company (the “Stockholder Representative”), and the stockholders of the Company listed on the signature
pages hereto (collectively with each Permitted Transferee of such stockholder, the “Stockholders”). 
 WHEREAS, the parties
hereto desire to enter into this Agreement to provide for certain registration rights for the Stockholders with respect to their Registrable Securities (as defined below). 

NOW, THEREFORE, the parties mutually agree as follows: 

ARTICLE I. 

DEFINITIONS; RULES OF CONSTRUCTION 

SECTION 1.01. Definitions. The following terms, as used herein, have the following meanings: 

“1933 Act” means the Securities Act of 1933 and the rules and regulations promulgated thereunder. 

“1934 Act” means the Securities Exchange Act of 1934 and the rules and regulations promulgated thereunder. 

“Adverse Disclosure” means public disclosure of material, non-public information, which, in the reasonable good faith
judgment of the chief executive officer or the chief financial officer of the Company, after consultation with outside counsel to the Company: (a) would be required to be made in any registration statement of the Company filed with, or to be
filed with, the Commission under the 1933 Act or otherwise filed with the Commission by the Company so that such registration statement would not be materially misleading or so that such registration statement would otherwise comply with the 1933
Act or applicable law; (b) would not be required to be made at such time but for the filing or existence of such registration statement; and (c) the Company has a bona fide business purpose for not disclosing publicly. 

“Affiliate” of any specified Person means any other Person directly or indirectly controlling, controlled by or under direct
or indirect common control with such specified Person. No Person shall be deemed to be an Affiliate of another Person solely by virtue of the fact that both Persons own shares of the Company’s Capital Stock. 

“Agreement” has the meaning set forth in the preamble. 

“beneficial owner” has the meaning set forth in Rules 13d-3 under the 1934 Act; and words of similar import such as
“beneficial ownership” and “beneficially own” have meanings correlative to the foregoing. 

 “Board” means the Board of Directors of the Company. 

“Business Day” means each day that is not a day on which banking institutions in the City of New York and the City of Houston
are authorized or obligated by law or executive order to close. 
 “Capital Stock” means, with respect to any Person, any
and all shares, interests, participations, rights in or other equivalents (however designated) of such Person’s capital stock, and any debt, rights, warrants or options exercisable or exchangeable for or convertible into such capital stock.

 “Commission” means the Securities and Exchange Commission. 

“Common Stock” means the common stock, par value $0.05 per share, of the Company. 

“Company” has the meaning set forth in the preamble. 

“control” means, with respect to any Person, the power to direct the management and policies of such Person, directly or
indirectly, whether through the ownership of voting securities, by contract or otherwise; and words of similar import such as “controlling” and “controlled” have meanings correlative to the foregoing. 

“Demand Registration” has the meaning set forth in Section 3.02(a). 

“Effectiveness Period” has the meaning set forth in Section 3.03(a). 

“Joinder Agreement” means a joinder agreement, a form of which is attached hereto as Exhibit A. 

“Lock-up Period” has the meaning set forth in Section 3.06(a). 

“owner” means, with respect to any shares of Capital Stock, the Person that is the record owner of such shares of Capital
Stock, as reflected on the applicable issuer’s stock records; and words of similar import such as “own” have meanings correlative to the foregoing. 

“Permitted Transferee” means: 

(a) with respect to any Stockholder that is an investment fund, an investment partnership or an investment account, any Related
Person of such Stockholder; 
 (b) with respect to any Stockholder that is a trust, any other trust, corporation, partnership
or other entity, the beneficiaries, stockholders, partners or other owners of which consist entirely of such trust or such trust’s beneficiaries; 

(c) with respect to any Stockholder that is an entity and to which clause (a) above is not applicable, any
controlled Affiliate of such Stockholder so long as such Transferee remains a controlled Affiliate of such Stockholder following the applicable Transfer; and 

  
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 (d) with respect to any Stockholder who is a natural person, (i) such
Stockholder’s spouse, parents, parents-in-law, descendants, nephews, nieces, brothers, sisters, brothers-in-law, sisters-in-law and children-in-law, (ii) such Stockholder’s heirs, legatees, beneficiaries or devisees and (iii) any
trust, corporation, partnership or other entity, the beneficiaries, stockholders, partners or other owners of which consist entirely of such Stockholder or such other persons referred to in clauses (i) and (ii) above; 

provided that, in any of such cases, such Permitted Transferee is an accredited investor within the meaning of Regulation D under
the 1933 Act. 
 “Person” means an individual, a corporation, a general or limited partnership, a limited liability
company, a joint stock company, an association, a trust or any other entity or organization, including a government, a political subdivision or an agency or instrumentality thereof. 

“Piggyback Holder” has the meaning set forth in Section 3.01(a). 

“Piggyback Registration” has the meaning set forth in Section 3.01(a). 

“Registrable Securities” means (a) the shares of Common Stock issued pursuant to the Subscription Agreement (or any
capital stock issued with respect to such shares in connection with any stock split, combination of shares, recapitalization or reorganization) and owned by any Stockholder at the time of determination and (b) any other Capital Stock issued or
issuable with respect to such shares of Common Stock by way of a stock split, stock dividend, reclassification, subdivision or reorganization, recapitalization or similar event. A Registrable Security shall cease to be a Registrable Security when
(i) a registration statement with respect to the offering of such security by the holder thereof shall have been declared effective under the 1933 Act and such security shall have been disposed of by such holder pursuant to such registration
statement, or (ii) such security shall have been otherwise Transferred by the holder thereof and a certificate for such security not bearing a legend restricting further transfer shall have been delivered by the Company or its transfer agent
and any subsequent Transfer of such security shall not require registration or qualification under the 1933 Act or any similar state law then in force. 

“Registration” has the meaning set forth in Section 3.03. 

“Related Person” means, with respect to any Person, (a) an Affiliate of such Person, (b) any investment manager,
investment advisor, managing member or general partner of such Person, (c) any investment fund, investment partnership, investment account or other Person whose investment manager, investment advisor, managing member or general partner is such
Person or a Related Person of such Person, and (d) any equity investor, member, partner or officer of such Person. 

“Representatives” means, with respect to any Person, the directors, officers, employees, consultants, financial advisors,
attorneys, accountants and agents of such Person. 

  
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 “Request Notice” has the meaning set forth in Section 3.02(a). 

“Rule 144” means Rule 144 under the 1933 Act. 

“Securities” means the Common Stock and any other Capital Stock of the Company or any of its subsidiaries. 

“Stockholder” has the meaning set forth in the preamble. 

“Subscription Agreement” means that certain Subscription Agreement dated as of the date hereof by and among the Company and
the “Subscribers” listed on the signature pages thereto. 
 “Stockholder Representative” has the meaning set
forth in the preamble. 
 “Suspension” has the meaning set forth in Section 3.03(l). 

“Transfer” means the direct or indirect offer, sale, lease, donation, assignment (as collateral or otherwise), mortgage,
pledge, grant, hypothecation, encumbrance, gift, bequest or transfer or disposition of any interest (legal or beneficial) in any security (including the transfer of any Person that owns such security or transfer by reorganization, merger, sale of
substantially all of the assets or by operation of law). 
 “Transferee” means any Person to whom Securities are
Transferred. 
 SECTION 1.02. Rules of Construction. Any provision of this Agreement that refers to the words
“include,” “includes” or “including” shall be deemed to be followed by the words “without limitation.” References to the preamble or numbered or letter articles, sections, subsections, paragraphs, exhibits or
schedules refer to the preamble or articles, sections, subsections, paragraphs, exhibits or schedules, respectively, of this Agreement unless expressly stated otherwise. All references to this Agreement include, whether or not expressly referenced,
the exhibits and schedules attached hereto. The section and other headings contained in this Agreement are for reference purposes only and shall not affect the meaning or interpretation of this Agreement. The words “hereof,”
“herein” and “hereunder” and words of similar import when used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The word “or” when
used in this Agreement is not exclusive. The definitions contained in this Agreement are applicable to the singular as well as the plural forms of such terms and to the masculine as well as to the feminine and neuter genders of such term. Unless
otherwise expressly indicated, any agreement, instrument, law or statute defined or referred to herein or in any agreement or instrument that is referred to herein means such agreement, instrument or statute as from time to time amended, modified or
supplemented, including (in the case of agreements or instruments) by waiver or consent and (in the case of statutes) by succession of comparable successor statutes and references to all attachments thereto and instruments incorporated therein.
References to a Person are also to its permitted successors and assigns. In the event that any claim is made by any Person relating to any conflict, omission or ambiguity in this Agreement, no presumption or burden of proof or persuasion shall be
implied by virtue of the fact that this Agreement was prepared by or at the request of a particular Person or its counsel. 

  
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 ARTICLE II. 

REPRESENTATIONS AND WARRANTIES 

Each of the parties hereby severally and not jointly represents and warrants to each of the other parties as follows: 

(a) Authority; Enforceability. Such party (i) has the legal capacity or organizational power and authority to execute, deliver and
perform its obligations under this Agreement and (ii) (in the case of parties that are not natural persons) is duly organized and validly existing and in good standing (in jurisdictions that recognize the concept of good standing) under the
laws of its jurisdiction of organization. This Agreement has been duly executed and delivered by such party and constitutes a legal, valid and binding obligation of such party, enforceable against it in accordance with the terms of this Agreement,
subject to applicable bankruptcy, insolvency, reorganization, moratorium and other laws affecting the rights of creditors generally and to the exercise of judicial discretion in accordance with general principles of equity (whether applied by a
court of law or of equity). 
 (b) Consent. No consent, waiver, approval, authorization, exemption, registration, license or
declaration is required to be made or obtained by such party, other than those that have been made or obtained on or prior to the date hereof, in connection with (i) the execution or delivery of this Agreement or (ii) the consummation of
any of the transactions contemplated hereby. 
 ARTICLE III. 

REGISTRATION RIGHTS 

SECTION 3.01. Company Registration. 

(a) Right to Piggyback on Registration of Common Stock. Subject to Section 3.01(c), if at any time or from time to time the
Company proposes to register shares of Common Stock under the 1933 Act in connection with a public offering of such Common Stock on any form other than Form S-4 or Form S-8 or any similar successor forms or another form used for a purpose similar to
the intended use for such forms (a “Piggyback Registration”), whether for its own account or for the account of one or more stockholders of the Company, the Company shall give the Stockholder Representative notice of such
determination at least ten Business Days prior to the anticipated effective date of such Piggyback Registration. Upon the written request of the Stockholder Representative (the “Piggyback Holder”) given within five Business Days
after receipt of any such notice by the Company, the Company shall use its reasonable best efforts to cause to be registered under the 1933 Act all of the Registrable Securities that the Stockholder Representative has requested to be registered;
provided that if, at any time after giving written notice of its intention to register any securities and prior to the effective date of the registration statement filed in connection with such registration, the Company shall determine for
any reason not to register or to delay registration of all such securities, the Company may, at its election, give written notice of such determination to the Piggyback Holder and (i) in the case of a determination not to register all of such
securities, shall be relieved of its obligation to register 

  
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any Registrable Securities in connection with such registration (but not from any obligation of the Company to pay the registration expenses in connection therewith); and (ii) in the case of
a determination to delay registering, shall be permitted to delay registering any Registrable Securities for the same period as the delay in registering such other securities. No registration effected under this Section 3.01 shall
relieve the Company of its obligation to effect any registration upon demand under Section 3.02. 
 (b) Selection of
Underwriters. If any Piggyback Registration involves an underwritten primary offering of the Company’s securities, the Board shall have the right to select any underwriter or underwriters to manage such Piggyback Registration, subject to
the prior written consent of the Stockholder Representative (which consent shall not be unreasonably withheld, conditioned or delayed). 

(c) Priority on Piggyback Registrations. In the event that the Piggyback Registration includes an underwritten offering, the
registration rights provided in Section 3.01(a) shall be subject to the condition that if the managing underwriter or underwriters of a Piggyback Registration advise the Company that in its opinion the number of Registrable Securities
proposed to be sold in such Piggyback Registration exceeds the number that can be sold without adversely affecting the marketability, proposed offering price, timing, distribution method or probability of success of the offering, the Company, the
Stockholders and other holders of Common Stock, as the case may be, will include in such registration only the number of Registrable Securities and other Common Stock which, in the opinion of such underwriter or underwriters, can be sold in such
offering without such adverse effect. The Registrable Securities and other Common Stock so included in such Piggyback Registration (unless it is a Demand Registration) shall be apportioned as follows: (i) first, to any shares of Common Stock
that the Company proposes to sell and (ii) second, pro rata among shares of the Registrable Securities included in such Piggyback Registration and other shares of Common Stock included in such Piggyback Registration (owned by holders of
Common Stock other than the Stockholders), in each case according to the total number of shares of the Registrable Securities requested for inclusion by the Piggyback Holder and the total number of shares of Common Stock requested for inclusion by
holders of Common Stock other than the Stockholders. Notwithstanding anything herein to the contrary, the Stockholders’ rights under this Section 3.01 shall not be subordinated to any registration rights, including any
“piggyback” registration rights, of any other stockholder of the Company. 
 SECTION 3.02. Demand Registration Rights.

 (a) Right to Demand. At any time or from time to time, subject to the limitations set forth below, the Stockholder Representative
may make a written request, which request will specify the aggregate number of Registrable Securities to be registered and will also specify the intended methods of disposition thereof (the “Request Notice”) to the Company for
registration with the Commission under and in accordance with the provisions of the 1933 Act of all or part of the Registrable Securities then owned by the Stockholders (a “Demand Registration”). The Stockholder Representative may
not submit a Request Notice unless the market value of the aggregate number of Registrable Securities (calculated as of the most current practicable date prior to the date of the Request Notice) is $5,000,000 or greater. A registration pursuant to
this Section 3.02 will be on such appropriate form of the Commission as shall be 

  
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selected by the Stockholder Representative and for which the Company then qualifies and be reasonably acceptable to the Company and as shall permit the intended method or methods of distribution
specified by the Stockholder Representative, including a distribution to, and resale by, the partners or Affiliates of the Stockholders. The Stockholder Representative acknowledges that the Company is not currently Form S-3 eligible. The Company
shall not be required to effect a Demand Registration more than four (4) times; provided, however, that a registration statement filed pursuant to a Demand Registration shall not count as a Demand Registration under this sentence unless it has
become effective. 
 Upon any such request for a Demand Registration, the Company will deliver any notices required by
Section 3.01 and thereupon the Company will, subject to Section 3.01(c) and 3.02(d) hereof, use its reasonable best efforts to effect the prompt registration under the 1933 Act of: 

(i) the Registrable Securities which the Company has been so requested to register by the Stockholder Representative as
contained in the Request Notice; and 
 (ii) all other Registrable Securities which the Company has been requested to
register by the Piggyback Holder; and 
 (iii) shares of Common Stock owned by holders other than the Stockholders, which
holders have piggyback registration rights and have notified the Company that they are exercising their piggyback rights in connection with such Demand Registration; and 

(iv) any newly issued shares of Common Stock to be sold by the Company, 

and all to the extent required to permit the disposition of the Registrable Securities and other Common Stock so to be registered in accordance with the
intended method or methods of disposition of each seller of such Registrable Securities and other Common Stock. 
 (b) Revocation.
The Stockholder Representative may, at any time prior to the effective date of the registration statement relating to such Demand Registration, revoke such request by providing a written notice thereof to the Company and shall not be required to
reimburse the Company for any of its expenses incurred in connection with such attempted registration. 
 (c) Selection of
Underwriters. If any of the Registrable Securities covered by a Demand Registration are to be sold in an underwritten offering, the Stockholder Representative will have the right to select the managing underwriter(s) to administer the offering
subject to the approval of the Board, which approval will not be unreasonably withheld, conditioned or delayed. 
 (d) Priority on Demand
Registrations. If the managing underwriter or underwriters of a Demand Registration advise the Company in writing that in its or their opinion the number of Registrable Securities and other Common Stock proposed to be sold in such

  
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Demand Registration exceeds the number which can be sold without adversely affecting the marketability, proposed offering price, timing, distribution method or probability of success of the
offering, the Company will include in such registration only the number of Registrable Securities and other Common Stock which, in the opinion of such underwriter or underwriters, can be sold in such offering without such adverse effect. The
Registrable Securities and other Common Stock so included in such Demand Registration shall be apportioned as follows: (i) first, pro rata among shares of the Registrable Securities included in such Demand Registration according to the
total number of shares of the Registrable Securities requested for inclusion by each Stockholder and (ii) second, pro rata among the other shares of Common Stock included in such Demand Registration (owned by holders of Common Stock
other than the Stockholders or to be issued by the Company), in each case according to the total number of shares of Common Stock requested for inclusion by the holders of Common Stock other than the Stockholders and the Common Stock to be issued by
the Company. 
 SECTION 3.03. Registration Procedures. It shall be a condition precedent to the obligations of the Company to
take any action pursuant to this Article III that the Stockholders requesting inclusion in any Piggyback Registration or Demand Registration (a “Registration”) shall furnish to the Company such information regarding them, the
Registrable Securities owned by them, the intended method of disposition of such Registrable Securities, and such agreements regarding indemnification, disposition of such securities and other matters referred to in and consistent with this
Article III, as the Company shall reasonably request and as shall be required in connection with the action to be taken by the Company (such intended method of distribution may include a distribution to, and resale by, the partners of the
holders of any Registrable Securities). With respect to any Registration which includes Registrable Securities owned by a Stockholder, the Company will, subject to Sections 3.01 and 3.02: 

(a) Subject to Section 3.03(l), as promptly as possible (in the case of a Demand Registration, no more than (i) 60 days after
the Company’s receipt of a Request Notice that is not for a Registration on Form S-3 or any successor or comparable form and (ii) 45 days after the Company’s receipt of a Request Notice that is for a Registration on Form S-3 or any
successor or comparable form) prepare and file with the Commission a registration statement on the appropriate form prescribed by the Commission for such intended method of disposition. Upon and after filing the registration statement, the Company
will use its reasonable best efforts to cause such registration statement to become effective as soon as practicable thereafter; provided that before filing a registration statement or prospectus or any amendments or supplements thereto, the
Company shall furnish to counsel representing the Stockholders selling Registrable Securities under such Registration copies of all documents proposed to be filed, which documents shall be subject to the review and reasonable comments of such
counsel; provided, further, that the Company shall not be obligated to maintain such Registration effective for a period longer than (x) 180 days or (y) such shorter period when all of the Registrable Securities covered by
such registration statement have been sold pursuant thereto (the “Effectiveness Period”). In the event the Company shall give any notice pursuant to Section 3.03(e) or Section 3.03(l), the time period
mentioned in this Section 3.03(a) during which the required registration statement is to remain effective shall be extended by the number of days during the period from and including the date of the giving of such notice pursuant to
Section 3.03(e) or Section 3.03(l) to and including the date when each Stockholder covered by the registration statement shall have received the copies of the supplemented or amended prospectus contemplated by
Section 3.03(e) or shall have otherwise been notified by the Company that the Suspension has been lifted; 

  
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 (b) Prepare and file with the Commission such amendments and post-effective amendments to such
registration statement and any documents required to be incorporated by reference therein as may be necessary to keep the registration statement effective for a period of not less than the Effectiveness Period (but not prior to the expiration of the
time period referred to in Section 3(3) of the 1933 Act and Rule 174 thereunder, if applicable); cause the prospectus to be supplemented by any required prospectus supplement, and as so supplemented to be filed pursuant to Rule 424 under the
1933 Act and comply with the 1933 Act in a timely manner; and comply with the provisions of the 1933 Act applicable to it with respect to the disposition of all Registrable Securities covered by such registration statement during the applicable
period in accordance with the intended method or methods of disposition by the sellers thereof set forth in such registration statement or supplement to the prospectus; 

(c) Promptly incorporate in a prospectus supplement or post-effective amendment such information as the underwriter(s) or the Stockholder
Representative reasonably requests to be included therein relating to the plan of distribution with respect to such Registrable Securities; and make all required filings of such prospectus supplements or post-effective amendments as soon as
practical after being notified of the matters to be incorporated in such supplement or amendment; 
 (d) Furnish to such Stockholder,
without charge, such number of conformed copies of the registration statement and any post-effective amendment thereto as such Stockholder may reasonably request, and such number of copies of the prospectus (including each preliminary prospectus)
and any amendments or supplements thereto, and any documents incorporated by reference therein, as such Stockholder or underwriter or underwriters, if any, may request in order to facilitate the disposition of the securities being sold by such
Stockholder (it being understood that the Company consents to the use of the prospectus and any amendment or supplement thereto by such Stockholder covered by the registration statement and the underwriter or underwriters, if any, in connection with
the offering and sale of the securities covered by the prospectus or any amendments or supplements thereto); 
 (e) Notify such Stockholder,
at any time when a prospectus relating thereto is required to be delivered under the 1933 Act, when the Company becomes aware of the happening of any event as a result of which the prospectus included in such registration statement (as then in
effect) contains any untrue statement of material fact or omits to state a material fact necessary to make the statements therein (in the case of the prospectus or any preliminary prospectus, in light of the circumstances under which they were made)
not misleading and, as promptly as practicable thereafter, prepare and file with the Commission and furnish a supplement or amendment to such prospectus so that, as thereafter delivered to the investors of such securities, such prospectus will not
contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in light of the circumstances under which they were made, not misleading; 

(f) Make generally available to its security holders an earnings statement, which need not be audited, satisfying the provisions of
Section 11(a) of the 1933 Act as soon as 

  
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reasonably practicable after the end of the 12-month period beginning with the first month of the Company’s first fiscal quarter commencing after the effective date of the registration
statement, which statement shall cover said 12-month period, and which requirement will deemed to be satisfied if the Company complies with Rule 158 under the 1933 Act; 

(g) After the filing of a registration statement, (i) notify each Stockholder holding Registrable Securities covered by such registration
statement of any stop order issued or, to the Company’s knowledge, threatened by the Commission and of the receipt by the Company of any notification with respect to the suspension of the qualification of any Registrable Securities for sale
under the applicable securities or blue sky laws of any jurisdiction, (ii) use its reasonable best efforts to obtain the withdrawal of any order suspending the effectiveness of the registration statement or the qualification of any Registrable
Securities at the earliest possible moment, and (iii) make available upon reasonable notice and during normal business hours for inspection by any seller of Registrable Securities, any underwriter participating in any disposition pursuant to
such registration statement, and any attorney, accountant or other agent retained by any such seller or underwriter, all financial and other records, pertinent corporate and business documents and properties of the Company as shall be reasonably
necessary to enable them to exercise their due diligence responsibility, and cause the Company’s Representatives to supply all such information reasonably requested by any such seller, underwriter, attorney, accountant, or agent in connection
with such registration statement; 
 (h) In connection with the preparation and filing of each Registration, give each holder of Registrable
Securities included in such Registration, the underwriter(s) and their respective counsel, accountants and other Representatives and agents the opportunity to participate in the preparation of each registration statement, each prospectus included
therein or filed with the Commission, and each amendment thereof or supplement thereto and comparable statements under the securities or blue sky laws of any jurisdiction and give each of the foregoing Persons access upon reasonable notice and
during normal business hours to the books and records, pertinent corporate and business documents and properties of the Company and its subsidiaries and such opportunities to discuss the business and affairs of the Company and its subsidiaries with
the respective Representatives and the independent public accountants who have certified the Company’s consolidated financial statements, and supply all other information and respond to all other inquiries requested by such holders,
underwriter(s), counsel, accountants and other Representatives and agents as shall be necessary or appropriate, in the opinion of such holders or underwriter(s), to conduct a reasonable investigation within the meaning of the 1933 Act, and the
Company shall not file any registration statement or amendment thereto or any prospectus or supplement thereto to which such holder or such underwriter(s) shall object; 

(i) Cause its employees to participate in “road shows” and other presentations as reasonably requested by the underwriters in
connection with such Registration; 
 (j) Deliver promptly to counsel representing the Stockholders selling Registrable Securities under
such Registration and each underwriter, if any, participating in the offering of the Registrable Securities, copies of all correspondence between the Commission and the Company, its counsel or auditors, and all memoranda relating to discussions with
the Commission or its staff with respect to such Registration; and 

  
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 (k) On or prior to the date on which the registration statement is declared effective, use its
reasonable best efforts to (i) register or qualify, and cooperate with such underwriter or underwriters, if any, and their counsel in connection with the registration or qualification of, the securities covered by the registration statement for
offer and sale under the securities or blue sky laws of each state and other jurisdiction of the United States as the managing underwriter or underwriters, if any, requests in writing, to use its reasonable best efforts to keep each such
registration or qualification effective, including through new filings, or amendments or renewals, during the Effectiveness Period and do any and all other acts or things necessary or advisable to enable the disposition in all such jurisdictions of
the Registrable Securities covered by the applicable registration statement; provided that the Company will not be required to qualify generally to do business in any jurisdiction where it is not then so qualified or to take any action which
would subject it to general taxation or to general service of process in any such jurisdiction where it is not then so subject, (ii) obtain a “comfort” letter from the Company’s independent public accountants in customary form
and covering such matters of the type customarily covered by comfort letters, which letter shall be addressed to the underwriters, and the Company shall use its reasonable best efforts to cause such comfort letter to also be addressed to the holders
of such Registrable Securities, (iii) obtain an opinion from the Company’s outside counsel in customary form and covering such matters of the type customarily covered by such opinions, which opinion shall be addressed to the underwriters
and the holders of such Registrable Securities, and (iv) enter into and perform its obligations under such customary agreements (including underwriting agreements in customary form) and take all such other actions as the holders of a majority
of the Registrable Securities included in the Request Notice, in the case of a Demand Registration, or the holders of a majority of the Registrable Securities being sold or the underwriters, if any, in the case of a Piggyback Registration,
reasonably request in order to expedite or facilitate the disposition of such Registrable Securities. 
 The Stockholders, upon receipt of
any notice from the Company of the happening of any event of the kind described in subsection (e) of this Section 3.03, will forthwith discontinue disposition of the Registrable Securities until the Stockholders’ receipt
of the copies of the supplemented or amended prospectus contemplated by subsection (e) of this Section 3.03 or until it is advised in writing by the Company that the use of the prospectus may be resumed, and has received
copies of any additional or supplemental filings which are incorporated by reference in the prospectus, and, if so directed by the Company, each Stockholder will, or will request the managing underwriter or underwriters, if any, to, deliver, to the
Company (at the Company’s sole expense) all copies, other than permanent file copies then in such Stockholder’s possession, of the prospectus covering such securities current at the time of receipt of such notice. 

No holder of Registrable Securities shall be required to make any representations or warranties to or agreements with the Company, other than
representations and warranties regarding such holder, such holder’s ownership of and title to the Registrable Securities to be sold in such offering, and its intended method of distribution and any liability of any such holder under such
underwriting agreement shall be limited to liability arising from breach of its representations and warranties therein and shall be limited to an amount equal to the net amount received by such holder from the sale of Registrable Securities pursuant
to such registration statement. 

  
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 (l) If the filing of a registration statement or the continued effectiveness of a registration
statement at any time would require the Company to make an Adverse Disclosure, the Company may, upon giving prompt written notice of such action to the Stockholder Representative, delay filing the registration statement or suspend use of the
registration statement (in either case, a “Suspension”); provided, however, the Company shall not be permitted to exercise a Suspension (i) more than twice during any twelve (12) month period, (ii) for a
period exceeding twenty-five (25) calendar days on any one occasion, or (iii) for an aggregate period exceeding ninety (90) days in any twelve (12) month period. In the case of a Suspension, the notice required above shall
request the Stockholders to suspend any sale or purchase, or offer to sell or purchase, the Registrable Securities, and to suspend use of the prospectus related to the registration in connection with any such sale or purchase or offer to sell or
purchase. The Company shall promptly notify the Stockholder Representative upon the termination of any Suspension, and amend or supplement the prospectus, if necessary, so it does not contain any untrue statement or omission and furnish to the
Stockholders such numbers of copies of the prospectus as so amended or supplemented as the Stockholders may reasonably request. 

SECTION 3.04. Registration Expenses. 

(a) In the case of any Registration, the Company shall bear all expenses incident to the Company’s performance of or compliance with
Sections 3.01, 3.02 and 3.03 of this Agreement, including all Commission and stock exchange or the Financial Industry Regulatory Authority, Inc. registration and filing fees and expenses, fees and expenses of compliance with
securities or blue sky laws (including reasonable fees and disbursements of counsel in connection with blue sky qualifications of the Registrable Securities), rating agency fees, printing expenses, messenger, telephone and delivery expenses, fees
and disbursements of counsel for the Company and all independent certified public accountants and any fees and disbursements of underwriters customarily paid by issuers or sellers of securities (but not including any underwriting discounts or
commissions, or transfer taxes, if any, attributable to the sale of Registrable Securities by a selling Stockholder or fees and expenses of more than one counsel representing the Stockholders selling Registrable Securities under such Registration as
set forth in Section 3.04(b) below). 
 (b) In connection with each Registration initiated hereunder (whether a Demand
Registration or a Piggyback Registration), the Company shall reimburse the holders covered by such Registration for the reasonable fees and disbursements of one law firm chosen by the Stockholder Representative. 

SECTION 3.05. Indemnification. 

(a) Indemnification by the Company. The Company agrees to indemnify and hold harmless each Stockholder, the underwriters selling such
Stockholder’s Registrable Securities and their respective officers, directors, Affiliates and agents and each Person who controls (within the meaning of the 1933 Act or the 1934 Act) any of them, including any general partner or manager of any
thereof, against all losses, claims, damages, liabilities and expenses (including reasonable out-of-pocket counsel fees and disbursements) arising out of or based upon any untrue or alleged untrue statement of a material fact contained in any
registration statement, prospectus or preliminary prospectus, or any amendment thereof or supplement 

  
 12 

 
thereto, in which such Stockholder participates in an offering of Registrable Securities or in any document incorporated by reference therein or any omission or alleged omission to state therein
a material fact required to be stated therein or necessary to make the statements therein (in the case of the prospectus or any preliminary prospectus, in light of the circumstances under which they were made) not misleading, except insofar as the
same are made in reliance on and in conformity with any information with respect to such Stockholder furnished in writing to the Company by such Stockholder expressly for use therein. 

(b) Indemnification by the Stockholders. In connection with any registration statement in which a Stockholder is participating, each
such Stockholder will furnish to the Company in writing such information and affidavits with respect to such Stockholder as the Company reasonably requests for use in connection with any registration statement or prospectus covering the Registrable
Securities of such Stockholder and to the extent permitted by law agrees to indemnify and hold harmless the Company, the underwriters selling the Registrable Securities and their respective directors, officers, Affiliates and agents and each Person
who controls (within the meaning of the 1933 Act or the 1934 Act) any of them, including any general partner or manager thereof, against any losses, claims, damages, liabilities and expenses (including reasonable out-of-pocket counsel fees and
disbursements) arising out of or based upon any untrue or alleged untrue statement of a material fact or any omission to state a material fact required to be stated therein or necessary to make the statements in the registration statement,
prospectus or preliminary prospectus (in the case of the prospectus or preliminary prospectus, in light of the circumstances under which they were made) not misleading, to the extent, but only to the extent, that such untrue statement or omission is
made in reliance on and in conformity with the information or affidavit with respect to such Stockholder so furnished in writing by such Stockholder expressly for use in the registration statement or prospectus; provided that the obligation
to indemnify shall be several, not joint and several, among such Stockholders and the liability of each such Stockholder shall be in proportion to and limited to the net amount received by such Stockholder from the sale of Registrable Securities
pursuant to such registration statement in accordance with the terms of this Agreement. The indemnity agreement contained in this Section 3.05(b) shall not apply to amounts paid in settlement of any such loss, claim, damage, liability,
action or proceeding if such settlement is effected without the consent of such Stockholder. The Company and the holders of the Registrable Securities hereby acknowledge and agree that, unless otherwise expressly agreed to in writing by such
holders, the only information furnished or to be furnished to the Company for use in any registration statement or prospectus relating to the Registrable Securities or in any amendment, supplement or preliminary materials associated therewith are
statements specifically relating to (i) the beneficial ownership of shares of Common Stock by such holder and its Affiliates, (ii) transactions or the relationship between such holder and its Affiliates, on the one hand, and the Company,
on the other hand (iii) the name and address of such holder and (iv) any additional information about such holder or the plan of distribution (other than for an underwritten offering) required by law or regulation to be disclosed in any
such document. 
 (c) Conduct of Indemnification Proceedings. Any Person entitled to indemnification hereunder will (i) give
prompt written notice to the indemnifying party of any claim with respect to which it seeks indemnification and (ii) unless in such indemnified party’s reasonable judgment a conflict of interest may exist between such indemnified and
indemnifying parties with respect to such claim, permit such indemnifying party to assume the defense of such 

  
 13 

 
claim with counsel reasonably satisfactory to the indemnified party. The failure to so notify the indemnifying party shall not relieve the indemnifying party from any liability hereunder with
respect to the action, except to the extent that such indemnifying party is materially prejudiced by the failure to give such notice; provided that any such failure shall not relieve the indemnifying party from any other liability which it
may have to any other party or to such indemnified party other than pursuant to this Section 3.05. No indemnifying party in the defense of any such claim or litigation, shall, except with the consent of such indemnified party, which
consent shall not be unreasonably withheld, consent to entry of any judgment or enter into any settlement with respect to such indemnified party which does not include as an unconditional term thereof the giving by the claimant or plaintiff to such
indemnified party of a release from all liability in respect of such claim or litigation. An indemnifying party who is not entitled to, or elects not to, assume the defense of a claim will not be obligated to pay the fees and expenses of more than
one counsel for all parties indemnified by such indemnifying party with respect to such claim, unless in the reasonable judgment of any indemnified party there may be one or more legal or equitable defenses available to such indemnified party which
are in addition to or may conflict with those available to any other of such indemnified parties with respect to such claim, in which event the indemnifying party shall be obligated to pay the reasonable fees and expenses of such additional counsel
or counsels. 
 (d) Contribution. If for any reason the indemnification provided for in the preceding subsections (a) and
(b) of this Section 3.05 is unavailable to an indemnified party as contemplated by the preceding subsections (a) and (b) of this Section 3.05 or is insufficient to hold such indemnified
party harmless, then the indemnifying party shall contribute to the amount paid or payable by the indemnified party as a result of such loss, claim, damage or liability (i) in such proportion as is appropriate to reflect the relative benefits
received by the indemnified party and the indemnifying party, or (ii) if the allocation provided by the preceding clause (i) is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative
benefits referred to in the preceding clause (i) but also the relative fault of the indemnified party and the indemnifying party, as well as any other relevant equitable considerations. The relative fault of the Company on the one hand
and of the sellers of Registrable Securities and any other sellers participating in the registration statement on the other hand shall be determined by reference to, among other things, whether the untrue or alleged omission to state a material fact
relates to information supplied by the Company or by the sellers of Registrable Securities or other sellers participating in the registration statement and the parties’ relative intent, knowledge, access to information and opportunity to
correct or prevent such statement or omission. In no event shall the liability of any such Stockholder be greater in amount than the amount of net proceeds received by such Stockholder upon such sale or the amount for which such indemnifying party
would have been obligated to pay by way of indemnification if the indemnification provided in subsection (b) of this Section 3.05 had been available. 

SECTION 3.06. Holdback Agreements. Whenever the Company proposes to register any of its equity securities under the 1933 Act in an
underwritten offering for its own account (other than on Form S-4 or S-8 or any similar successor form or another form used for a purpose similar to the intended use of
such forms) or is required to use its reasonable efforts to effect the registration of any Registrable Securities under the 1933 Act pursuant to Section 3.01 or 3.02 or in the case of a takedown from a shelf registration
statement, each holder of Registrable Securities agrees by acquisition of such Registrable Securities not to effect any sale 

  
 14 

 
or distribution, including any sale pursuant to Rule 144 under the 1933 Act, or to request registration under Section 3.02 of any Registrable Securities for the time period reasonably
requested by the managing underwriter for the underwritten offering; provided that in no event shall such period exceed 90 days (the “Lock-up Period”) after the effective date of the registration statement relating to such
registration, except (i) as part of such registration or (ii) in the case of a private sale or distribution, unless the Transferee agrees in writing to be subject to this Section 3.06. If requested by such managing underwriter,
each holder of Registrable Securities agrees to execute a holdback agreement, in customary form, consistent with the terms of this Section 3.06(a); provided, that if the Company or any underwriter releases any holder of
Registrable Securities from such holdback agreement, it shall similarly release all other holders of Registrable Securities on a pro rata basis. 

SECTION 3.07. Participation in Registrations. No Stockholder may participate in any Registration hereunder that is underwritten
unless such Stockholder (a) agrees to sell its securities on the basis provided in any underwriting arrangements approved by the Persons entitled hereunder to approve such arrangements (provided that such underwriting arrangements shall
not limit any of such Stockholder’s rights under this Agreement), and (b) completes and executes all questionnaires, powers of attorney, underwriting agreements and other documents customarily required under the terms of such underwriting
arrangements. 
 ARTICLE IV. 

MISCELLANEOUS 

SECTION 4.01. Notices. All notices, demands or requests made pursuant to, under or by virtue of this Agreement must be in writing
and sent to the party to which the notice, demand or request is being made at the address or facsimile number set forth on the signature pages hereof (or in the relevant Joinder Agreement), or at such other address or facsimile number as such party
shall have furnished to the Company in writing; provided that: 
 (a) unless otherwise specified by the Stockholder Representative in
a notice delivered by the Stockholder Representative in accordance with this Section 4.01, any notice required to be delivered to any Stockholder shall be properly delivered if delivered to: 

 

			
	 c/o KKR Credit Advisors (US) LLC

555 California St., 50th Floor
 San Francisco, CA
94104

	Attention:		General Counsel
	Facsimile:		(415) 391-3077

  
 15 

			
	with a copy (which shall not constitute notice) to
	
	 Proskauer Rose LLP
 One
International Place
 Boston, MA 02110

	Attention:		 Peter J. Antoszyk
 Daniel I.
Ganitsky

	Facsimile:		(617) 526-9899

 (b) unless otherwise specified by the Company in a notice delivered by the Company in accordance with this
Section 4.01, any notice required to be delivered to the Company shall be properly delivered if delivered to: 
  

			
	 Willbros Group, Inc.
 4400 Post Oak
Parkway, Suite 1000
 Houston, TX 77027

	Attention:		General Counsel
	Facsimile:		(713) 403-8136
	
	with a copy (which shall not constitute notice) to
	
	 Conner & Winters, LLP
 4000
One Williams Center
 Tulsa, OK 74172

	Facsimile:		(918) 586-8673
	Attention:		Robert J. Melgaard

 Notice shall be delivered (i) by nationally recognized overnight courier delivery for next Business Day delivery,
(ii) by hand delivery, or (iii) by facsimile or electronic mail transmission followed by overnight delivery the next Business Day. Legal counsel for the respective parties may send to the other party any notices, requests, demands or other
communications required or permitted to be given hereunder by such party. Each such notice or other communication shall for all purposes of this Agreement be treated as effective, or as having been given, only upon receipt thereof at the address
specified hereunder. 
 SECTION 4.02. Binding Effect; Benefits. This Agreement shall be binding upon and inure to the benefit of
the parties to this Agreement and their respective successors and permitted assigns. Except as set forth in Section 3.05, nothing in this Agreement, express or implied, is intended or shall be construed to give any Person other than the
parties to this Agreement or their respective successors or permitted assigns any legal or equitable right, remedy or claim under or in respect of any agreement or any provision contained herein. 

SECTION 4.03. Amendment. This Agreement may not be amended, restated, modified or supplemented in any respect and the observance
of any term of this Agreement may not be waived except by a written instrument executed by the Stockholder Representative, so long as it or any of its Permitted Transferees remains a Stockholder. 

  
 16 

 SECTION 4.04. Assignability. Neither this Agreement nor any right, remedy, obligation
or liability arising hereunder or by reason hereof shall be assignable by either the Company or any Stockholder except as otherwise expressly stated hereunder or with the prior written consent of the Stockholder Representative, so long as it or any
of its Permitted Transferees remains a Stockholder and any attempted assignment in violation of this Section 4.04 shall be null and void ab initio. A Permitted Transferee who executes a Joinder Agreement in accordance with the
provisions hereof may be assigned any rights available hereunder in connection with a Transfer of Common Stock to such Permitted Transferee. 

SECTION 4.05. Governing Law; Submission to Jurisdiction. 

(a) This Agreement, and any contest, dispute, controversy or claim arising hereunder or related hereto, will be governed by and construed in
accordance with the internal laws of the State of Delaware applicable to agreements made and to be performed in that state, without reference to its principles of conflicts of law that would apply the laws of another jurisdiction. 

(b) The parties hereto irrevocably submit, in any proceeding directly or indirectly relating to or arising out of this Agreement, to the
exclusive jurisdiction of the courts of the State of Delaware or any federal court of the District of Delaware (in each case located in New Castle County), consent that any such proceeding may only be brought in such courts, waive any objection that
they may now or hereafter have to the venue of such proceeding in any such court or that such proceeding was brought in an inconvenient forum and agrees to be bound by any judgment rendered thereby in connection with this Agreement. Each of the
parties further agrees that a summons and complaint commencing a proceeding in any of such courts shall be properly served and shall confer personal jurisdiction if served to it at the address and in the manner set forth in Section 4.01
or as otherwise provided under the laws of the State of Delaware. This provision may be filed with any court as written evidence of the knowing and voluntary irrevocable agreement between the parties to waive any objections to jurisdiction, to venue
or to convenience of forum. 
 SECTION 4.06. Enforcement. Without limiting or waiving in any respect any rights or remedies of
the parties hereto under this Agreement now or hereinafter existing at law or in equity, each of the parties hereto (a) expressly agree that the provisions of this Agreement may be specifically enforced against each of the parties hereto in any
court of competent jurisdiction and (b) hereby waive any requirement for the posting of any bond or similar collateral in connection therewith. 

SECTION 4.07. Severability. If any provision of this Agreement shall be invalid, illegal or unenforceable, the validity, legality
and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. If any of this Agreement is so broad as to be unenforceable, the provision shall be interpreted to be only so broad as is enforceable. 

SECTION 4.08. Counterparts. This Agreement and any joinders hereto may be executed in any number of counterparts, including by way
of electronic transmission (e.g., pdf and facsimile formats), each of which may be executed by less than all of the parties hereto, each of which shall be enforceable against the parties actually executing such counterparts, and all of which
together shall constitute one instrument. 

  
 17 

 SECTION 4.09. Termination of Certain Provisions. All rights and obligations under
this Agreement will terminate and be of no force and effect when no Stockholder holds any Registrable Securities. 
 SECTION 4.10.
Waiver of Jury Trial. Each party to this Agreement, for itself and its Related Persons, hereby irrevocably and unconditionally waives to the fullest extent permitted by applicable law all right to trial by jury in any action, proceeding or
counterclaim (whether based on contract, tort or otherwise) arising out of or relating to the actions of the parties hereto or their respective Related Persons pursuant to this Agreement or in the negotiation, administration, performance or
enforcement of this Agreement. 
 SECTION 4.11. Further Assurances. Each party agrees that it shall, from time to time after the
date of this Agreement, execute and deliver such other documents and instruments and take such other actions as may be reasonably requested by the Company or the Stockholder Representative to carry out the transactions contemplated by this
Agreement. 
 SECTION 4.12. Entire Agreement. This Agreement supersedes all prior agreements, whether written or oral, between
the parties with respect to its subject matter and constitutes (along with the exhibits and other documents delivered pursuant to this Agreement) a complete and exclusive statement of the terms of the agreement between the parties with respect to
its subject matter. 
 SECTION 4.13. Stockholder Representative. 

(a) By the execution and delivery of this Agreement, each Stockholder hereby irrevocably appoints the Stockholder Representative to act as its
agent and attorney-in-fact, with full authority and power of substitution to act for, and on behalf of, such Stockholder in matters reasonably necessary or advisable in connection with the transactions contemplated by this Agreement, including
having the authority to: (i) execute and deliver all instruments, agreements and documents that may be necessary or desirable, as determined by the Stockholder Representative in its sole discretion, in connection with the transactions
contemplated by this Agreement; (ii) approve, and execute and deliver an amendment effecting, any waiver of, or modification to, this Agreement; provided, however, that any waiver or modification that is materially adverse to any
Stockholder shall require the written consent of such Stockholder; (iii) engage counsel, public accountants or other independent experts in connection with the transactions contemplated by this Agreement; and (iv) perform each such act and
thing whatsoever that the Stockholder Representative may be or is required to do, or that the Stockholder Representative in its sole discretion determines is desirable to do (including in connection with the indemnification provisions set forth in
Section 3.05), pursuant to or to carry out the intent of this Agreement. The Stockholder Representative shall not have any duties, responsibilities or obligations except those expressly set forth in this Agreement, and no implied
covenants, agreements, functions, duties, responsibilities, obligations or liabilities shall be read into this Agreement or shall otherwise exist against the Stockholder Representative or any of its Representatives. 

  
 18 

 (b) The grant of authority provided for in this Section 4.13: (i) is an agency
coupled with an interest and will be irrevocable and survive the death, incapacity, bankruptcy or liquidation of or other similar event affecting any Stockholder and will be binding on any successor thereto; and (ii) subject to this Section
4.13, may be exercised by the Stockholder Representative acting by signing as the Stockholder Representative of any Stockholder. 
 (c)
If the Stockholder Representative or its any of its successors or assigns, as the case may be, advises the Stockholders that it is unavailable to perform its duties hereunder, then, as soon as practicable after notice of such advice, an alternative
Stockholder Representative will be appointed by a majority in interest of the Stockholders. Any references in this Agreement to the Stockholder Representative shall be deemed to include any duly appointed successor Stockholder Representative. 

(d) The Stockholder Representative will not be entitled to any fee, commission or other compensation for the performance of its services
hereunder, but shall receive reimbursement from, and be indemnified from the Stockholders on a pro rata basis for, any and all expenses, charges and liabilities, including attorneys’ fees, incurred by the Stockholder Representative in the
performance or discharge of its duties set forth in this Section 4.13, including in connection with the Stockholder Representative’s successful defense against any claim of liability with respect thereto; provided that
(i) any obligation of the Stockholders shall be several and not joint and (ii) the Stockholder Representative shall not be indemnified or receive reimbursement for any such expenses, charges or liabilities incurred as a result of the
Stockholder Representative’s gross negligence, willful misconduct or fraud. 
 (e) In dealing with this Agreement and any instruments,
agreements or documents relating hereto, and in exercising or failing to exercise all or any of the powers conferred upon the Stockholder Representative hereunder or thereunder, (i) the Stockholder Representative will not assume any, and will
incur no, liability whatsoever to any Stockholder or any other Person because of any error in judgment or other act or omission of the Stockholder Representative in connection with this Agreement that does not constitute gross negligence, willful
misconduct or fraud; and (ii) the Stockholder Representative will be entitled to rely on the advice of counsel, public accountants or other independent experts experienced in the matter at issue, and any good faith error in judgment or other
act or omission of the Stockholder Representative pursuant to such advice will not subject the Stockholder Representative to liability to any Stockholder or any other Person. 

(f) References to the Stockholder Representative herein shall be deemed to refer to the Stockholder Representative solely in its capacity as
such. 
 [signature page follows] 

  
 19 

 IN WITNESS WHEREOF, the undersigned has executed this Agreement as of the date first set forth
above. 
  

			
	WILLBROS GROUP, INC.
		
	By:		 /s/ Richard W. Russler

	Name:		Richard W. Russler
	Title:		Treasurer

  
 Signature Page to
Registration Rights Agreement 

 IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first set forth
above. 
  

			
	CORPORATE CAPITAL TRUST, INC.,
	as a Stockholder
		
	By:		 /s/ Nicole Macarchuk

	Name:		Nicole Macarchuk
	Title:		Authorized Signatory
	
	 KKR LENDING PARTNERS L.P.,
 as a
Stockholder

		
	By:		 /s/ Nicole Macarchuk

	Name:		Nicole Macarchuk
	Title:		Authorized Signatory
	
	 KKR LENDING PARTNERS II L.P.,
 as a
Stockholder

		
	By:		 /s/ Nicole Macarchuk

	Name:		Nicole Macarchuk
	Title:		Authorized Signatory
	
	 KKR-VRS CREDIT PARTNERS L.P.,
 as a
Stockholder

		
	By:		 /s/ Nicole Macarchuk

	Name:		Nicole Macarchuk
	Title:		Authorized Signatory
	
	 LINCOLN INVESTMENT SOLUTIONS, INC.,

as a Stockholder

		
	By:		 /s/ Nicole Macarchuk

	Name:		Nicole Macarchuk
	Title:		Authorized Signatory

  
 Signature Page to
Registration Rights Agreement 

 
			
	KKR CREDIT SELECT (DOMESTIC) FUND L.P.,
	as a Stockholder
		
	By:		 /s/ Nicole Macarchuk

	Name:		Nicole Macarchuk
	Title:		Authorized Signatory
	
	 KKR CREDIT ADVISORS (US) LLC,
 as
Stockholder Representative

		
	By:		 /s/ Nicole Macarchuk

	Name:		Nicole Macarchuk
	Title:		Authorized Signatory

  
 Signature Page to
Registration Rights Agreement 

 EXHIBIT A 

FORM OF JOINDER AGREEMENT 

WHEREAS, simultaneously with the execution of this Agreement, the undersigned is acquiring
                 shares of common stock, par value $0.05 (the “Common Stock”), of Willbros Group, Inc., a Delaware corporation (the
“Company”); 
 WHEREAS, as a condition to the acquisition of the Common Stock, the undersigned has agreed to join in a
certain Registration Rights Agreement, dated March 31, 2015 (the “Registration Rights Agreement”), among the Company and the Stockholders (as such term is defined in the Registration Rights Agreement) party thereto; and 

WHEREAS, the undersigned understands that the execution of this Agreement is a condition precedent to the acquisition of the Common Stock;

 NOW, THEREFORE, as an inducement to both the transferor of the Common Stock and the other Stockholders to allow the Transfer (as such
term is defined in the Registration Rights Agreement) of the Common Stock to the undersigned, the undersigned agrees as follows: 
 1. The
undersigned hereby joins in the Registration Rights Agreement and agrees to be bound by the terms and provisions of the Registration Rights Agreement as provided by the Registration Rights Agreement as a Stockholder. 

[signature page follows] 

  
 A-1 

 IN WITNESS WHEREOF, the undersigned has executed this Agreement this      day
of             , 20    . 
  

	
	  

	Name:
	Title:
	Address:EX-10.1

 Exhibit 10.1 

MEDBOX, INC. 
 DEBENTURE
AMENDMENT AGREEMENT 
 March [13], 2015 

Reference is made to the 10% Convertible Debentures due pursuant to that certain Securities Purchase Agreement dated July 21, 2014, as
amended effective January 30, 2015 (each a “Debenture,” in the aggregate, the “Debentures”) issued by Medbox, Inc. (the “Company”) to Redwood Management, LLC (the “Holder”).

 The Company and the Holder desire to modify the terms of the Debentures as set forth herein. Accordingly, the Company and the Holder
hereby agree as follows: 
  

	1.	Definitions and Interpretation 

 Capitalized terms not otherwise defined herein
shall have the meanings set forth in the Debentures. 
  

	2.	Amendment of the Debentures 

  

	2.1	The parties hereby agree that, with immediate effect from the execution of this Debenture Amendment, each Debenture, which Debentures are scheduled on Schedule 1 to this Debenture Amendment Agreement, shall be amended
as follows: 

  

	 	(a)	Section 4(b) of each Debenture is hereby modified by replacing the number “20” with the number “40” in such section so that as amended Section 4(b) provides: 

Conversion Price. The conversion price in effect on any Conversion Date shall be equal to the lower of (a) $5.00, subject to
adjustment herein (the “Fixed Conversion Price”), or (b) 51% of the lowest VWAP for the 40 consecutive Trading Days ending on the Trading Day that is immediately prior to the applicable Conversion Date (the resulting pricing
being referred to herein as the “Conversion Price”). All such determinations will be appropriately adjusted for any stock dividend, stock split, stock combination, reclassification or similar transaction that proportionately
decreases or increases the Common Stock during such measuring period. Nothing herein shall limit a Holder’s right to pursue actual damages or declare an Event of Default pursuant to Section 6 hereof and the Holder shall have the right to
pursue all remedies available to it hereunder, at law or in equity including, without limitation, a decree of specific performance and/or injunctive relief. The exercise of any such rights shall not prohibit the Holder from seeking to enforce
damages pursuant to any other Section hereof or under applicable law. 
  

	 	(b)	Section 6(a)(xvii) of each Debenture is hereby modified by replacing the date “March 31, 2015,” with the date “April 30, 2015.” 

	3.	Other Acknowledgements 

 The Parties agree and acknowledge that the Fixed
Conversion Price of all Debentures pursuant to Section 4(b)(a) is $1.83 as a result of Dilutive Issuances under Section 5(b) of the Debentures. Further the Parties agree that this Section 3 shall constitute a Dilutive Issuance Notice
under the Debentures. 
  

	4.	Counterparts and delivery 

 This Debenture Amendment may be executed in any number
of counterparts, each of which shall be deemed to be an original, and which together shall constitute one and the same agreement. 

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK] 

 IN WITNESS WHEREOF, the Company and the Holder have caused this Debenture Amendment to be
signed by their duly authorized officers. 
  

					
	MEDBOX, INC.
		
	By:		

			Name:		Guy M Marsala
			Title:		CEO
	
	REDWOOD MANAGEMENT, LLC
		
	By:		

			Name:		Gary Rogers
			Title:		Manager

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