Document:

Sterling Holdco, Inc.

Restricted Stock Plan

 

Section 1.

Purpose

 

The purpose of this
Plan is to foster and promote the long-term financial success of the Company and the Subsidiaries and materially increase stockholder
value by (a) motivating superior performance by means of incentives, (b) encouraging and providing for the acquisition
of an ownership interest in the Company by Employees, and (c) enabling the Company and the Subsidiaries to attract and retain
the services of an outstanding management team upon whose judgment, interest, and special effort the successful conduct of its
and their operations is largely dependent.

 

Section 2.

Definitions

 

Whenever used herein,
the following terms shall have the respective meanings set forth below:

 

Act: the
Securities Act of 1933, as amended.

 

Adjustment Event:
shall mean (i) any stock dividend, stock split, or share combination affecting the Common Stock, (ii) any recapitalization,
reorganization, merger, consolidation, exchange of shares, spin-off, liquidation, or dissolution of the Company, (iii) any
disposition by the Providence Entities of all or substantially all of the Common Stock beneficially owned by the Providence Entities
other than such a disposition solely for cash, or (iv) any other similar transaction affecting the Common Stock.

 

Board: the
Board of Directors of the Company.

 

Change in Control:
a transaction or series of transactions (other than a Public Offering):

 

(i)involving the
sale, transfer, or other disposition for cash by the Providence Entities to one or more persons or entities that are not, immediately
prior to such sale, affiliates of the Company or the Providence Entities, of all or substantially all of the Common Stock of the
Company beneficially owned by the Providence Entities as of the date of such transaction; or

 

(ii)involving the
sale, transfer, or other disposition for cash of all or substantially all of the assets of the Company and the Subsidiaries, taken
as a whole, to one or more persons or entities that are not, immediately prior to such sale, transfer, or other disposition, affiliates
of the Company or the Providence Entities.

 

Code: the
Internal Revenue Code of 1986, as amended.

 

Committee:
the Board or any authorized committee thereof.

 

    	 

    	 

    

 

Common Stock:
the common stock of the Company, par value $0.01 per share.

 

Company: Sterling
Holdco, Inc., a Delaware corporation, and any successor thereto.

 

Effective Date:
July 1, 2013, the date on which the Plan was approved by the Board to take effect, subject to the approval of the Company’s
stockholders as required by applicable law.

 

Employee:
any officer or other key employee of the Company or any Subsidiary that is classified as being in Grades 16-20.

 

Fair Market Value:
if no Public Offering has occurred, the Fair Market Value of a share of Common Stock shall be equal to the value most recently
established by the Board, in its sole discretion, which value may take into account information from a valuation expert retained
by the Board and which may be adjusted, if deemed necessary or advisable by the Board, for significant developments occurring since
the date such value was established. If a Public Offering has occurred, the Fair Market Value, on any date of determination, shall
mean the closing price for a share of Common Stock as reported on a national exchange or a nationally recognized system of price
quotation for such date or, if there is no such closing price for such date, for the most recent date with respect to which such
closing price is available. In the event that there are no Common Stock transactions reported on such exchange or system on such
date, Fair Market Value shall mean the closing price on the immediately preceding date on which Common Stock transactions were
so reported. In all events, the Fair Market Value shall be determined in a manner consistent with Code Section 409A.

 

Grant Date:
the date on which shares of Restricted Stock are granted to a Participant under the terms of this Plan and the terms of such Participant’s
Restricted Stock Agreement.

 

Management Stockholders
Agreement: the Management Stockholders Agreement, dated as of February 9, 2012, among the Company and certain other stockholders
of the Company, as it may be amended from time to time.

 

Participant:
any Employee designated by the Committee to receive a grant of Restricted Stock under the Plan.

 

PEP VI: Providence
Equity Partners VI L.P., a Delaware limited partnership.

 

PEP VI-A:
Providence Equity Partners VI-A L.P., a Delaware limited partnership.

 

Permitted Transferee:
a transferee permitted under Section 1(a) of the Management Stockholders Agreement.

 

Person: the
meaning set forth in the Management Stockholders Agreement.

 

Plan: this
Sterling Holdco, Inc. Restricted Stock Plan, as the same may be amended from time to time in accordance with its terms.

 

    	 

    	 

    

 

Providence Entities:
collectively, PEP VI, PEP VI-A, Providence Equity Partners, L.L.C., and any of their affiliates or any other investment fund or
similar fund managed or advised by PEP VI, PEP VI-A, or Providence Equity Partners, L.L.C.

 

Public Offering:
a public offering pursuant to an effective registration statement filed with the Securities and Exchange Commission that covers
shares of Common Stock that, after the closing of such public offering, will be traded on the New York Stock Exchange, the American
Stock Exchange, or the National Association of Securities Dealers Automated Quotation System or any comparable non-U.S. exchange
or system.

 

Restricted Stock:
shares of Common Stock that are awarded to a Participant pursuant to this Plan and that are subject to such conditions, restrictions
and risk of forfeiture that are set forth in the Restricted Stock Agreement between the Company and such Participant.

 

Restricted Stock
Agreement: the written agreement between the Company and a Participant, setting forth the number of shares of Restricted
Stock that the Company grants to a Participant under this Plan, and describing the conditions, restrictions, and risk of forfeiture
with respect to such shares of Restricted Stock.

 

Subsidiary:
any corporation, a majority of whose outstanding voting securities is owned, directly or indirectly, by the Company.

 

 

Section 3.

Eligibility and Participation

 

Participants in the
Plan shall be those Employees selected by the Committee to participate in the Plan and receive Restricted Stock (which may include
Employees who are members of the Committee). The selection of an Employee as a Participant shall neither entitle such Employee
to, nor disqualify such Employee from, participation in any other award or incentive plan of the Company or any Subsidiary.

 

 

Section 4.

Administration

 

4.1.Power
to Grant and Establish Terms of Restricted Stock. The Committee shall be responsible for the administration of the Plan.
The Committee shall have the discretionary authority, subject to the terms of the Plan, to determine (i) the Employees to whom
Restricted Stock shall be granted, (ii) the number of shares to be awarded to each Participant, (iii) the time or times at which
shares of Restricted Stock shall be awarded, and (iv) the terms, conditions, vesting provisions, and restrictions of any and all
shares of Restricted Stock awarded to each Participant. Subject to Section 8, such terms and conditions shall not be subsequently
changed in a manner that would be adverse to the Participant without the consent of the Participant to whom such shares of Restricted
Stock have been granted. The Committee’s determinations under the Plan (including, without limitation, the determinations
of persons eligible to receive awards of Restricted Stock, the amount and time of such awards, the terms and conditions of such
awards, and the terms of any Restricted Stock Agreement evidencing the same) need not be uniform, and may be made by the Committee
selectively, among persons who receive, or are eligible to receive, awards under the Plan, whether or not such persons are similarly
situated. The grant of any Restricted Stock to any Employee shall neither entitle such Employee to, nor disqualify him or her from,
the grant of any other Restricted Stock.

 

    	 

    	 

    

 

4.2.Power
to Administer Plan. The Committee shall have full discretionary authority to prescribe, adopt, amend, and rescind rules
and regulations relating to the Plan, to provide for conditions deemed necessary or advisable to protect the interests of the Company,
to interpret the terms of the Plan and of any Restricted Stock Agreement issued under the Plan, and to make any and all other determinations
necessary or advisable for the administration and interpretation of the Plan and to carry out its provisions and purposes. Any
determination, interpretation, or other action made or taken (including any failure to make any determination or interpretation,
or take any other action) by the Committee pursuant to the provisions of the Plan shall be final, binding, and conclusive for all
purposes and upon all persons and shall be given deference in any proceeding with respect thereto.

 

4.3.Power
to Delegate Authority. The Committee may delegate any or all of its duties and powers hereunder to any of the senior officers
of the Company, subject to such conditions and limitations as the Committee shall prescribe.

 

4.4.Limitation
on Liability. The Committee shall use ordinary care and diligence in the performance of its duties pertaining to the Plan.
To the maximum extent permitted by law, no member of the Committee (or any of its delegatees) shall be liable for any action taken,
or decision made, in good faith relating to the Plan or to any award of Restricted Stock hereunder.

 

4.5.Indemnification.
To the maximum extent permitted by law, the members of the Committee shall be indemnified by the Company in respect of all their
activities under the Plan. The foregoing right of indemnification shall not be exclusive of any other rights of indemnification
to which such persons may be entitled as a matter of law or otherwise.

 

 

Section 5.

Stock Subject to the Plan

 

5.1.Number.
Subject to the provisions of Section 5.3, the aggregate number of shares of Common Stock that may be considered Restricted Stock
subject to award under the Plan may not exceed the number of shares authorized by the Board. The shares of Restricted Stock to
be delivered under the Plan may consist, in whole or in part, of shares held in treasury or authorized but unissued shares not
reserved for any other purpose. Notwithstanding the foregoing, if the tax withholding obligations relating to any award of Restricted
Stock are satisfied by delivering shares of Common Stock to the Company (by either actual delivery or by attestation), only the
number of shares of Restricted Stock issued, net of the shares of Common Stock subject to such delivery or attestation, shall be
deemed issued for purpose of the limits set forth in this Section 5.1, and the shares of Common Stock that are used to satisfy
such tax withholding obligations shall be deemed not to have been issued for purposes of the limits sets forth in this Section
5.1.

    	 

    	 

    

 

 

5.2.Cancelled,
Terminated or Forfeited Restricted Stock. Any shares of Restricted Stock that for any reason are cancelled, terminated,
forfeited, substituted, or otherwise settled shall no longer be available for grant under the Plan.

 

5.3.Adjustment
in Capitalization. If and to the extent necessary or appropriate to reflect any Adjustment Event, the Board shall adjust
the number of any outstanding shares of Restricted Stock granted under the Plan, and/or make such other substitution, revision,
or other adjustment with respect to any outstanding share of Restricted Stock or the holder or holders thereof, in each case as
it determines to be equitable or appropriate. In addition, and for the avoidance of doubt, in the event of a merger transaction,
each outstanding share of Restricted Stock shall be treated as provided for in the agreement entered into in connection with such
merger transaction. Any action taken pursuant to this Section 5.3 shall be effected in a manner that is exempt from, or otherwise
complies with, Code Section 409A. Any determination made by the Board under this Section 5.3 shall be final, binding, and conclusive
on all persons having or claiming any right hereunder.

 

 

Section 6.

Grants of Restricted Stock

 

6.1.Grant
of Restricted Stock. Subject to the terms of this Plan and applicable law, the Committee may at any time, and from time
to time, grant shares of Restricted Stock to Participants, in such amounts and subject to such vesting conditions, other terms,
conditions, and restrictions, as the Committee shall determine, in its sole discretion. Unless determined otherwise by the Committee,
Participants receiving shares of Restricted Stock are not required to pay the Company cash consideration therefor (except as may
be required for applicable tax withholding that may be elected by a Participant pursuant to Code Section 83(b)), provided that
the Company has determined, by resolution or otherwise, that the value of services provided by each Participant equals or exceeds
the par value of the shares of Restricted Stock awarded to him or her under the terms of this Plan.

 

A.Substitution
of Restricted Stock. The Committee shall have the right to grant, in substitution for outstanding shares of Restricted
Stock, replacement shares of Restricted Stock that may contain terms more favorable to the Participant than the Restricted Stock
they replace, and to cancel the replaced Restricted Stock, all subject to the consent of the Participants to whom the original
shares of Restricted Stock were granted under the terms of this Plan.

 

B.Agreements
with Vesting Conditions and Other Restrictions.

 

(1)Each grant of
shares of Restricted Stock to a Participant shall be evidenced by a Restricted Stock Agreement that specifies the applicable vesting
conditions, and other terms, conditions and restrictions (if any) of such grant, the duration of such restrictions, and the time
or times at which such restrictions shall lapse with respect to all or a specified number of the shares of Restricted Stock that
are part of the grant. Upon the grant of shares of Restricted Stock to a Participant under the terms of this Plan (or as soon as
practicable thereafter), the Committee shall deliver to the Participant, for execution, (i) such Restricted Stock Agreement, and
(ii) a Joinder Agreement pursuant to which the Participant shall become a party to the Management Stockholders Agreement. The effectiveness
of any grant of Restricted Stock under this Plan shall be subject to the Participant’s execution and delivery to the Company
of the signed Restricted Stock Agreement and Joinder Agreement to the Management Stockholders Agreement, on the date that the shares
of Restricted Stock are granted to him, or as soon as reasonably practicable thereafter.

 

    	 

    	 

    

(2)Notwithstanding
the foregoing, the Board or Committee reserves the right to reduce or shorten the duration of any vesting or other restriction
applicable to any shares of Restricted Stock awarded to any Participant under the Plan.

 

(3)Each Restricted
Stock Agreement provided to a different Participant need not contain provisions that are identical or similar to other such Agreements,
but each such Restricted Stock Agreement shall be consistent with the terms of the Plan.

 

(4)When a Participant
becomes fully vested in the shares of Restricted Stock granted to him or her under this Plan, such shares shall become transferable
subject to the terms and conditions of the Management Stockholders Agreement and of such Participant’s Restricted Stock Agreement.

 

6.2.Stock
Issuance and Stockholder Rights.

 

A.Stock certificates
issued with respect to shares of Restricted Stock that are granted to Participants under the terms of the Plan may (but are not
required to) be issued at the time that such shares of Restricted Stock are awarded to such Participants, subject to forfeiture
if the shares of Restricted Stock do not vest or other restrictions do not lapse. Any stock certificate issued to a Participant
under this Plan shall bear an appropriate legend or legends that comply with the applicable securities laws and regulations, and
that make appropriate reference to the restrictions imposed under the Plan, the Participant’s Restricted Stock Agreement,
and the Management Stockholders Agreement. The Participant may be required to deposit such certificate(s) with the Company during
the period of any restriction thereon and to execute a blank share power of attorney or other instrument of transfer therefor.

 

B.During the period
of restriction following issuance of the shares of Restricted Stock granted to a Participant hereunder, the Participant shall have
all of the rights of a holder of shares of Common Stock, including but not limited to the right to receive dividends (or amounts
equivalent to dividends) and to vote with respect to the shares of Restricted Stock, except to the extent otherwise provided by
the Committee, the Participant’s Restricted Stock Agreement, or the Management Stockholders Agreement. The Committee, in
its discretion, may provide that any dividends or distributions paid with respect to shares of Restricted Stock will be subject
to the same restrictions as the shares of Restricted Stock to which such dividends or distributions relate, and that cash dividends
may be held in custody or otherwise by the Company.

    	 

    	 

    

 

C.If stock certificates
with respect to shares of Restricted Stock have been issued to a Participant with a legend or legends as provided above, then as
soon as administratively practicable after the lapsing of the vesting restrictions with respect to any Restricted Stock, the Company
shall deliver to the Participant, in book-entry or certificate form, the shares of formerly Restricted Stock that do not bear any
restrictive legend referencing the vesting restrictions under the Participant’s Restricted Stock Agreement. Such shares of
Restricted Stock, however, shall continue to be subject to the restrictions required under Federal securities laws and other applicable
laws, the restrictive covenants in the Participant’s Restricted Stock Agreement, and the restrictions set forth in the Management
Stockholders Agreement.

 

6.3.Termination
of Restricted Stock. Unless otherwise determined by the Committee at the date of grant, upon the termination of a Participant’s
employment with the Company or its Subsidiaries for any reason (including death, disability, voluntary termination, or involuntary
termination), any shares of Restricted Stock that are not vested as of the effective date of such termination of employment shall
be forfeited and cancelled immediately upon the effective date of such termination. Notwithstanding the foregoing, however, the
Committee shall have the discretion to permit all or any portion of any shares of Restricted Stock to become vested following a
Participant’s termination of employment.

 

 

Section 7.

Change in Control; Public Offering

 

7.1.Accelerated
Vesting. Unless otherwise provided in the terms of a Participant’s Restricted Stock Agreement, each share of Restricted
Stock held by that Participant shall become fully vested in the event of a Change in Control or a Public Offering.

 

7.2.Limitation
on Benefits. Notwithstanding anything contained in the Plan or a Participant’s Restricted Stock Agreement to the
contrary: (i) to the extent that any of the payments and benefits provided for under the Plan, an applicable Restricted
Stock Agreement, or any other agreement or arrangement between the Company and a Participant (collectively, the “Payments”)
would constitute a “parachute payment” within the meaning of Section 280G of the Code, the Company and such Participant
may, upon mutual agreement, take action that would result in no portion of the Payments being subject to the excise tax imposed
pursuant to Section 4999 of the Code; and (ii) if and to the extent any Payments in respect of the Restricted Stock would,
absent application of this clause (ii), be an “excess parachute payment” within the meaning of Section 280G
of the Code (and the regulations promulgated thereunder), the Company and such Participant may, upon mutual agreement, provide
that such Restricted Stock shall not accelerate in the event of a Change in Control (notwithstanding Section 7.1), and shall be
honored, assumed, or new rights substituted therefor by a Participant’s employer (or the parent or a subsidiary of such employer)
in such Change in Control. If the Company and the Participant mutually agree that Payments would be reduced or eliminated, as the
case may be, pursuant to the immediately preceding sentence, and such Payments would not be so reduced or eliminated, as the case
may be, if the stockholder approval requirements of Section 280G(b)(5) of the Code are capable of being satisfied, the Company
shall use its reasonable best efforts to cause such Payments to be submitted for such approval prior to the Change in Control giving
rise to such Payments.

 

 

    	 

    	 

    

Section 8.

Amendment, Modification, and Termination
of the Plan

 

The Board may at any
time, and from time to time, alter, amend, suspend, or terminate the Plan in whole or in part. Except as provided in this Section
8, no such alteration, amendment, or termination shall adversely affect any outstanding Restricted Stock without the consent of
the holders of a majority of such Restricted Stock having similar terms, unless the Committee determines that such amendment or
alteration is necessary or advisable to comply with applicable law as a result of changes in law or regulation or to avoid the
imposition of an additional tax, interest, or penalty under Code Section 409A.

 

 

Section 9.

Miscellaneous Provisions

 

9.1.Nontransferability
of Restricted Stock. Unless the Committee shall permit (on such terms and conditions as it shall establish) Restricted
Stock to be transferred to a Permitted Transferee, no Restricted Stock granted under the Plan may be sold, transferred, pledged,
assigned, or otherwise alienated or hypothecated, and any attempted or purported sale, transfer, assignment, pledge, encumbrance,
or other disposition shall be void and unenforceable against the Company, except to the extent specifically permitted by the Management
Stockholders Agreement and the terms of a Participant’s Restricted Stock Agreement.

 

9.2.Beneficiary
Designation. Each Participant under the Plan may, from time to time, name any beneficiary or beneficiaries (who may be
named contingently or successively) to whom the shares of Restricted Stock granted to the Participant hereunder may be transferred
in case of his or her death. Each designation will revoke all prior designations by the same Participant, shall be in a form prescribed
by the Committee, and will be effective only when filed by the Participant in writing with the Committee during his or her lifetime.
In the absence of any such designation, any Restricted Stock outstanding at the Participant’s death shall be transferred
to the Participant’s surviving spouse, if any, or otherwise to or by his or her estate.

 

9.3.No Guarantee
of Employment or Participation; No Additional Compensation for Loss of Rights under Plan. Nothing in the Plan shall interfere
with or limit in any way the right of the Company or any Subsidiary to terminate any Participant’s employment or service
at any time, nor confer upon any Participant any right to continue in the employment of the Company or any Subsidiary. If any Participant’s
employment with the Company or any Subsidiary shall be terminated for any reason, such Participant shall not be entitled to any
compensation or other form of remuneration with respect to such termination (except as otherwise provided herein), to compensate
such Participant for the loss of any rights under the Plan, except as may be otherwise required to the contrary in his or her contract
of employment.

 

    	 

    	 

    

9.4.Tax Withholding.

 

A.Unless a Participant
has made an election under Code Section 83(b) to include in his taxable income the Fair Market Value of the shares of Restricted
Stock on the date that such shares are granted to him, at the time of vesting or lapse of the restrictions of the Restricted Stock,
the Participant shall pay in cash or cash equivalents to the Company or Subsidiary, as the case may be, any amount that the Company
or Subsidiary may reasonably determine to be necessary to satisfy any Federal, state or local taxes of any kind required by law
to be withheld with respect to the vesting of or other lapse of restrictions applicable to Restricted Stock. To satisfy its withholding
obligations, the Company or any Subsidiary shall have the power to deduct from payments of any kind otherwise due to a Participant
(including salary or bonus payments) any federal, state or local taxes of any kind or any applicable taxes required to be withheld
with respect to the vesting of the shares of Restricted Stock.

 

B.Subject to the
prior approval of the Company or the Subsidiary, which may be withheld by the Company or the Subsidiary, as the case may be, in
its sole discretion, the Participant may elect to satisfy such tax withholding obligations, in whole or in part, (i) by
causing the Company or the Subsidiary to withhold shares of Common Stock otherwise issuable to the Participant or (ii) by
delivering to the Company or the Subsidiary shares of Common Stock already owned by the Participant. The shares of Common Stock
so delivered or withheld shall have an aggregate Fair Market Value equal to such withholding obligations. The Fair Market Value
of the shares of Common Stock used to satisfy such withholding obligation shall be determined by the Company or the Subsidiary
as of the date that the amount of tax to be withheld is to be determined. A Participant who has made an election pursuant to this
Paragraph B to satisfy his or her withholding obligation with shares of Common Stock may only use shares of Common Stock that are
not subject to any repurchase, forfeiture, vesting, or other similar requirements.

 

9.5.No Limitation
on Compensation. Nothing in the Plan shall be construed to limit the right of the Company to establish other plans or to
pay compensation to its employees in cash or property.

 

9.6.Requirements
of Law; Securities Law Compliance. The granting of Restricted Stock and the issuance of shares of Common Stock shall be
subject to all applicable laws, rules, and regulations and to such approvals by any governmental agencies or national securities
exchanges as may be required. If at any time the Company shall determine, in its sole discretion, that the listing, registration
or qualification of any shares subject to a grant made pursuant to this Plan upon any securities exchange or under any governmental
regulatory body is necessary or desirable as a condition of, or in connection with, the issuance of Restricted Stock hereunder,
no shares of Common Stock may be issued to the Participant unless such listing, registration, qualification, consent or approval
shall have been effected or obtained free of any conditions not acceptable to the Company, and any delay caused thereby shall in
no way affect the date of termination of the grant. Instruments evidencing the grant of Restricted Stock may contain such other
provisions, not inconsistent with the Plan, as the Committee deems advisable, including a requirement that a Participant represent
to the Company in writing, when such Participant receives Restricted Stock (or at such other time as the Committee deems appropriate),
that such Participant is acquiring such shares (unless they are then covered by an effective registration statement filed under
the Act) for such Participant’s own account for investment only and with no present intention to transfer, sell, or otherwise
dispose of such shares except such disposition by a legal representative as shall be required by will or the laws of any jurisdiction
in winding up the estate of such Participant. Such shares of Common Stock shall be transferable only if the proposed transfer shall
be permissible pursuant to the Plan and if, in the opinion of counsel satisfactory to the Company, such transfer at such time will
be in compliance with all applicable securities laws.

 

    	 

    	 

    

9.7.Governing
Law. The Plan, and all agreements hereunder, shall be governed by and construed in accordance with the law of the State
of Delaware, regardless of the law that might be applied under principles of conflict of laws.

 

9.8.No Impact
on Benefits. Restricted Stock granted under the Plan shall not be considered to be compensation for purposes of calculating
an Employee’s rights under any employee benefit plan except to the extent expressly provided therein.

 

9.9.Code
Section 409A Compliance. The Plan is intended to be administered in a manner consistent with the requirements of Code Section
409A and the applicable rules, regulations, and guidance promulgated thereunder, and shares of Restricted Stock granted hereunder
are intended to be exempt from Code Section 409A; provided, that in no event shall the Company, the Committee, or any of
the Company’s directors, officers, or employees have any liability to any person in the event any such Code Section 409A
provision applies to any Restricted Stock in a manner that results in adverse tax consequences for the Participant or any of the
Participant’s beneficiaries or transferees.

 

9.10.Freedom
of Action. Nothing in the Plan or any Restricted Stock Agreement entered into pursuant to this Plan shall be construed
as limiting or preventing the Company or any Subsidiary from taking any action with respect to the operation or conduct of its
business that it deems appropriate or in its best interest.

 

9.11.No Fiduciary
Relationship. Nothing contained in the Plan and no action taken pursuant to the Plan shall create or be construed to create
a trust of any kind or any fiduciary relationship between the Company or any Subsidiary and any Participant or executor, administrator,
or other personal representative or designated beneficiary of such Participant, or any other persons.

 

9.12.Unsecured
Creditor; Plan Not Subject to ERISA. To the extent that any Participant or his or her executor, administrator, or other
personal representative, as the case may be, acquires a right to receive any payment from the Company pursuant to this Plan, such
right shall be no greater than the right of an unsecured general creditor of the Company. Any reserves that may be established
by the Company in connection with this Plan shall continue to be held as part of the general funds of the Company, and no individual
or entity other than the Company shall have any interest in such funds until paid to a Participant. The Plan is not intended to
be subject to the Employee Retirement Income Security Act of 1974, as amended.

 

    	 

    	 

    

9.13.Severability
of Provisions. If any provision of this Plan shall be held invalid or unenforceable, such invalidity or unenforceability
shall not affect any other provisions hereof, and this Plan shall be construed and enforced as if such provision had not been included.

 

9.14.Meaning
of the Term “Employment.” The terms “employ,” “employee,” and “employment”
as used in this Plan and in any Restricted Stock Agreement shall be deemed to refer to the provision of services to the Company
or one or more of its Subsidiaries as an employee, and the phrase “termination of employment” (and corollary terms)
shall mean the termination of such services to the Company and all of its Subsidiaries in all such capacities.

 

 

To record adoption of this Plan by the Board,
effective as of July 1, 2013, the Company has caused its authorized officer to execute the Plan.

 

 

 

STERLING HOLDCO, INC.

 

 

 

By: ___________________________

Name: _________________________

Title: __________________________Sterling Holdco, Inc.

RESTRICTED STOCK AGREEMENT

 

 

This RESTRICTED STOCK
AGREEMENT (the “Agreement”), dated effective as of July 1, 2013, is entered into by and between Sterling
Holdco, Inc., a Delaware corporation (the “Company”), and «First_Name» «Last_Name» (the
“Participant”), pursuant to the Sterling Holdco, Inc. Restricted Stock Plan, as in effect and as amended from
time to time (the “Plan”). Capitalized terms that are not defined herein shall have the meanings given to such
terms in the Plan.

 

WHEREAS, the Company
desires to grant shares of common stock, par value $0.01 per share (the “Common Stock”) to certain key employees
of the Company, subject to the vesting conditions and other restrictions described below (“Restricted Stock”);

 

WHEREAS, the Company
has adopted the Plan in order to effect such grants; and

 

WHEREAS, the Participant
is a key employee as contemplated by the Plan, and the Committee has determined that it is in the interest of the Company to grant
shares of Restricted Stock to the Participant.

 

NOW, THEREFORE, in
consideration of the premises and subject to the terms and conditions set forth herein and in the Plan, the parties hereto agree
as follows:

 

1.Confirmation
of Grant.

 

A.Grant
of Restricted Stock. The Company hereby grants to the Participant, effective as of the date hereof (the “Grant Date”),
[____________] shares of Restricted Stock, which are subject to all of the terms, conditions, and restrictions set forth in this
Agreement and in the Plan, the terms of which are made a part of, and incorporated into, this Agreement. As a condition of receiving
the grant of these shares of Restricted Stock, Participant hereby agrees to sign this Agreement and to execute a Joinder Agreement
to the Management Stockholders Agreement, in substantially the form attached hereto as Exhibit A. Any prior agreement, commitments
or negotiations between the Company and Participant concerning this grant of Restricted Stock are hereby superseded and extinguished.

 

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B.Investment Representation.
Instruments evidencing the grant of Restricted Stock may contain such other provisions, not inconsistent with the Plan, as the
Committee deems advisable, including a requirement that a Participant represent to the Company in writing, when such Participant
receives Restricted Stock (or at such other time as the Committee deems appropriate), that such Participant is an accredited investor,
as defined under the Securities Act of 1933, is acquiring such shares (unless they are then covered by an effective registration
statement filed under the Act) are for such Participant’s own account for investment only and with no present intention to
transfer, sell, or otherwise dispose of such shares except such disposition by a legal representative as shall be required by will
or the laws of any jurisdiction in winding up the estate of such Participant. Such shares of Common Stock shall be transferable
only if the proposed transfer shall be permissible pursuant to the Plan and if, in the opinion of counsel satisfactory to the Company,
such transfer at such time will be in compliance with all applicable securities laws.

 

2.
Vesting.

 

A.Vesting Upon
Service.

 

(1)Upon vesting
and the written request of the Participant the Company will issue the Participant’s Restricted Stock in his or her name.
The Participant’s right to the Common Stock granted under this Agreement will fully vest thirty-six (36) months from the
Grant Date (i.e. on June 30, 2016, the “Vesting Date”), subject to Participant’s continuous
employment with the Company or a Subsidiary from the Grant Date to such Vesting Date. For purposes of this Agreement, a Participant
will be deemed to be continuously employed by the Company or a Subsidiary if the Participant is actively performing service or
is on a bona fide employee leave of absence that was approved by the Company in writing and the terms of the leave, or applicable
law, provide for continued service crediting.

 

(2)In the event
that a Participant’s Vesting Date occurs during a period in which the Participant is limited in terms of his ability to sell
shares of Restricted Stock in order to satisfy his or her tax withholding obligations as described in Section 6, whether such limitation
is due to a lock-up agreement or the Company’s insider trading policy or similar restriction, then vesting in such shares
of Restricted Stock will be delayed until the first date on which the Participant is no longer prohibited from selling such shares
of Restricted Stock due to a lock-up agreement or insider trading restriction (the “Subsequent Vesting Date”), provided
that Participant has been continuously employed by the Company or a Subsidiary from the Grant Date until the Subsequent Vesting
Date and that Participant is able to sell such shares of Restricted Stock to satisfy such withholding obligations no later than
2 1⁄2 months after the end of the year in which the shares of Common Stock would otherwise have been delivered.

 

B.Termination
of Employment. Unless otherwise determined by the Committee, in the event that the Participant’s employment with the
Company or any Subsidiary terminates for any reason prior to the Vesting Date (whether on account of death, disability, voluntary
termination of employment, or involuntary termination of employment), then any unvested Restricted Stock that has been granted
to Participant pursuant to this Agreement shall be forfeited by the Participant and cancelled immediately, as of the effective
date of Participant’s termination of employment.

 

    	 	2

    	 

    

C.Change in Control;
Public Offering. In the event of a Change in Control or Public Offering, any Restricted Stock that has not yet vested on the
effective date of such Change in Control or Public Offering will become fully vested on such effective date.

 

D.No Other Accelerated
Vesting. The vesting provisions set forth in this Section 2, or expressly set forth in the Plan, shall be the exclusive
vesting provisions applicable to the Restricted Stock and shall supersede any other provisions relating to vesting, unless such
other provision expressly refers to the Plan and this Agreement. Notwithstanding the foregoing, however, the Committee may accelerate,
reduce or eliminate the vesting of any Restricted Stock at any time and from time to time, in its sole discretion.

 

3.Restrictions.
In order to receive any grant of Restricted Stock hereunder, the Participant hereby agrees that he or she shall (i) execute this
Restricted Stock Agreement, (ii) execute a Joinder Agreement to the Management Stockholders Agreement in substantially the form
set forth in Exhibit A, and (iii) deposit with the Company any stock certificate(s) issued to such Participant for the period
of any vesting restriction thereon, together with an executed blank share power of attorney or other instrument of transfer therefor
that may be reasonably requested by the Company from time to time. As soon as administratively practicable after the lapsing of
the vesting restrictions, with respect to any Restricted Stock subject to the terms of this Agreement, the Company shall deliver
to the Participant, in book-entry or certificate form, the shares of formerly Restricted Stock, which shall be free of the vesting
restrictions set forth in this Restricted Stock Agreement but shall continue to be subject to the restrictive covenants and repurchase
terms and conditions set forth in this Restricted Stock Agreement, to any restrictions required under Federal securities laws or
other applicable law, and to any restrictions set forth under the Management Stockholders Agreement. To the extent not vested,
no Restricted Stock granted hereby may be sold, transferred, pledged, assigned, encumbered, or otherwise alienated or hypothecated,
other than by will, by the laws of descent and distribution, or on such terms and conditions as the Committee shall establish,
to a Permitted Transferee.

 

    	 	3

    	 

    

4.Stockholder
Rights. During the period of restrictions with regard to the shares of Restricted Stock granted to a Participant hereunder,
the Participant shall have all of the rights of a holder of shares of Common Stock, including but not limited to the right to receive
dividends (or amounts equivalent to dividends) and to vote with respect to the shares of Restricted Stock, except as otherwise
provided by the Committee, this Agreement, or the Management Stockholders Agreement. The Committee, in its discretion, may provide
that any dividends or distributions paid with respect to shares of Restricted Stock subject to the unvested shares of Restricted
Stock will be subject to the same restrictions as the shares of Restricted Stock to which such dividends or distributions relate,
and that cash dividends may be held in custody or otherwise by the Company. For the avoidance of doubt, the Company shall have
the right, but not the obligation, to purchase the vested shares of Restricted Stock granted to a Participant hereunder upon the
Participant’s termination of employment from the Company or its Subsidiaries for any reason; provided, however, that in the
event that the Company decides to exercise such purchase right, the purchase price for a Participant’s vested shares of Restricted
Stock shall equal the lesser of such Stock’s Fair Market Value on the date such shares become vested or such Stock’s
Fair Market Value on the Grant Date, notwithstanding any provision to the contrary in the Management Stockholders Agreement.

 

5.Adjustments.
In the event of an Adjustment Event, the number of shares covered by the grant of Restricted Stock hereunder may be adjusted (and
rounded down to the nearest whole number), as provided in the Plan. The Participant’s Restricted Stock shall be subject to
the terms of any agreement of merger, liquidation or reorganization in the event the Company is subject to such corporate activity
in accordance with the terms of the Plan.

 

6.Tax Consequences.

 

A.General Tax
Consequences. Under Code Section 83(a), the Fair Market Value of the shares of Restricted Stock granted to Participant, determined
as of the date the vesting restrictions described in this Agreement, will lapse. Notwithstanding the foregoing, however, the Participant
acknowledges that he or she may elect to be taxed on the Fair Market Value of the shares of Restricted Stock as of the Grant Date,
rather than when such shares cease to be subject to such forfeiture restrictions, by filing an election under Code Section 83(b)
with the Internal Revenue Service within thirty (30) days after the Grant Date, in substantially the form attached to this Agreement
as Exhibit B. Failure to make this filing within the thirty (30) day period will result in the recognition of ordinary income
by the Participant as of the date the forfeiture restrictions lapse.

 

THE
PARTICIPANT ACKNOWLEDGES THAT IT IS HIS OR HER SOLE RESPONSIBILITY, AND NOT THE COMPANY’S, TO DETERMINE WHETHER OR NOT TO
FILE AN ELECTION UNDER CODE SECTION 83(B), AND TO FILE ANY SUCH ELECTION IN A TIMELY MANNER. THE PARTICIPANT IS RELYING SOLELY
ON HIS OR HER OWN ADVISORS WITH RESPECT TO THE DECISION AS TO WHETHER OR NOT TO FILE ANY CODE SECTION 83(B) ELECTION.

 

    	 	4

    	 

    

B.Tax Withholding.

 

(1)Unless a Participant
has made an election under Code Section 83(b) to include in his taxable income the Fair Market Value of the shares of Restricted
Stock on the Grant Date, the Participant shall pay, in cash or cash equivalents, at the time of vesting of Restricted Stock, any
amount that the Company or Subsidiary may reasonably determine to be necessary to satisfy any Federal, state or local taxes of
any kind required by law to be withheld with respect to the vesting of or other lapse of restrictions applicable to the Restricted
Stock. To satisfy its withholding obligations, the Company or any Subsidiary shall have the power to deduct from payments of any
kind otherwise due to a Participant (including salary or bonus payments) any federal, state or local taxes of any kind or any applicable
taxes required to be withheld with respect to the vesting of the shares of Restricted Stock.

 

(2)Notwithstanding
the foregoing, and subject to the terms of the Plan and the prior approval of the Company or the Subsidiary (which approval may
be withheld by the Company or the Subsidiary, as the case may be, in its sole discretion), the Participant may elect to satisfy
such obligations, in whole or in part, (i) by causing the Company or the Subsidiary to withhold shares of Common Stock otherwise
issuable to the Participant or (ii) by delivering to the Company or the Subsidiary shares of Common Stock already owned by the
Participant. The shares of Common Stock so delivered or withheld shall have an aggregate Fair Market Value equal to such withholding
obligations. The Fair Market Value of the shares of Common Stock used to satisfy such withholding obligation shall be determined
by the Company or the Subsidiary as of the date that the amount of tax to be withheld is to be determined. A Participant may satisfy
his or her withholding obligation only with shares of Common Stock that are not subject to any repurchase, forfeiture, unfilled
vesting, or other similar requirements.

 

C. Limitation on Benefits.
Notwithstanding anything contained in this Agreement or the Plan to the contrary: (i) to the extent that any payments and benefits
provided for under the Plan, this Agreement, or any other agreement or arrangement between the Company and the Participant (collectively,
the “Payments”) would constitute a “parachute payment” within the meaning of Section 280G of
the Code, the Participant and the Company may, upon mutual agreement, take action that would result in no portion of the Payments
being subject to the excise tax imposed pursuant to Section 4999 of the Code; and (ii) if and to the extent any Payments in
respect of the Restricted Stock would, absent application of this clause (ii), be an “excess parachute payment” within
the meaning of Section 280G of the Code (and the regulations promulgated thereunder), the Participant and the Company may,
upon mutual agreement, provide that such Restricted Stock shall not accelerate in the event of a Change in Control, and shall be
honored, assumed, or new rights substituted therefor by the new employer (or the parent or a subsidiary of such employer) in such
Change in Control. If the Participant and the Company mutually agree that Payments would be reduced or eliminated, as the case
may be, pursuant to the immediately preceding sentence and such Payments would not be so reduced or eliminated, as the case may
be, if the stockholder approval requirements of Section 280G(b)(5) of the Code are capable of being satisfied, the Company
shall use its reasonable best efforts to cause such Payments to be submitted for such approval prior to the Change in Control giving
rise to such Payments.

 

    	 	5

    	 

    

7.Restrictive
Covenants and Remedies for Breach. 

 

A.Restrictive
Covenants. In consideration of the receipt of the Restricted Stock granted pursuant to this Agreement, the Participant
agrees to be bound by the covenants set forth below:

 

(1)Confidentiality.
The Participant agrees that during the Participant’s employment with the Company or its Subsidiaries, and thereafter, the
Participant shall not disclose confidential or proprietary information, or trade secrets, related to any business of the Company
or its Subsidiaries including without limitation, and whether or not such information is specifically designated as confidential
or proprietary; all business plans and marketing strategies; information concerning existing and prospective markets, suppliers,
and customers; financial information; information concerning the development of new products and services; and technical and non-technical
data related to software programs, design, specifications, compilations, inventions, improvements, patent applications, studies,
research, methods, devices, prototypes, processes, procedures, and techniques. Without limiting the foregoing in any way, the Participant
agrees that the terms of this Agreement, and of other related agreements, shall be deemed to be confidential and proprietary information
of the Company that is subject to the foregoing confidentiality provisions and shall be protected as such, although Participant
may disclose this Agreement and such other related agreements to immediate family members, and to his or her financial or legal
advisors, to the minimum extent necessary. The Participant’s obligations under this Section 7A(1) are indefinite in
term.

 

(2)Return of
Company Property. The Participant acknowledges that all tangible items containing any confidential or proprietary information
or trade secrets, including without limitation memoranda, photographs, records, reports, manuals, drawings, blueprints, prototypes,
notes, documents, drawings, specifications, software, media, and other materials, including any copies thereof (including electronically
recorded copies), are the exclusive property of the Company and its Subsidiaries, and the Participant shall deliver to the Company
all such material in the Participant’s possession or control upon the Company’s request and in any event upon the termination
of the Participant’s employment with the Company or its Subsidiaries. The Participant shall also return any keys, equipment,
identification or credit cards, or other property belonging to the Company or its Subsidiaries upon termination of the Participant’s
employment or the Company’s request.

 

    	 	6

    	 

    

(3)Non-Piracy
of Restricted Customers and Restricted Prospective Customers. During Participant’s employment with the Company or its
Subsidiaries, and for 12 months immediately after Participant’s employment at the Company or its Subsidiaries terminates
for any reason, Participant will not, anywhere in the United States, solicit to provide, or engage in providing, any Competitive
Services or Products to any Restricted Customer or Restricted Prospective Customer. For purposes of this Section 7: (a) “Restricted
Customer” means any person, agency, or entity to whom Participant (or others under Participant’s direction and
supervision), on behalf of the Company or its Subsidiaries, provided Competitive Products or Services or about which Participant
acquired material, substantive information in the course of Participant’s employment with the Company or its Subsidiaries,
during the 24 month period immediately preceding the date of Participant’s separation from the Company or its Subsidiaries;
(b) “Restricted Prospective Customer” means any person, agency, or entity with whom Participant (or others
under Participant’s direction and supervision), on behalf of the Company or its Subsidiaries, was involved in making a proposal
to provide products or services during the 24 month period immediately preceding the date of Participant’s separation from
the Company or its Subsidiaries; and (c) “Competitive Products or Services” means products or services of the
type provided by the Company or its Subsidiaries to any person, agency, or entity during the 24 month period immediately preceding
the date of Participant’s separation from the Company or its Subsidiaries.

 

(4)Non-Solicitation
and Non-Hiring of Restricted Employees. Participant agrees that Participant shall not, during Participant’s employment
with the Company or its Subsidiaries, and for 12 months immediately after Participant’s employment at the Company
or its Subsidiaries terminates for any reason, directly or indirectly, hire or solicit, or assist in the hiring or solicitation
of, any Restricted Employee for a position of employment outside the Company or its Subsidiaries. This restriction includes and
applies to situations where another Company Employee initiates contact with Participant. “Restricted Employee”
means any person who was or is employed by the particular entity (Company or Subsidiary) in which Participant was employed at any
time during the 6 month period immediately preceding the date of the potential hiring or solicitation for hiring by the Participant.

 

B.Remedies.

 

(1)Generally.
The Company and the Participant agree that the provisions of this Section 7 do not impose an undue hardship on the Participant
and are not injurious to the public in that these restrictions do not prohibit Participant from competing generally with the Company,
but merely limit competition with certain customers and prospective customers; that these provisions are necessary to protect the
business of the Company and its Subsidiaries; that the nature of the Participant’s responsibilities with the Company under
this Agreement provide and/or will provide the Participant with access to confidential or proprietary information or trade secrets
that are valuable and confidential to the Company and its Subsidiaries; that the Company would not grant Restricted Stock to the
Participant if the Participant did not agree to the provisions of this Section 7; that the provisions of this Section 7 are
reasonable in terms of length of time and scope; and that adequate consideration supports the provisions of this Section 7.
In the event that a court determines that any provision of this Section 7 is unreasonably broad or extensive, the Participant
agrees that such court should narrow such provision to the extent necessary to make it reasonable and enforce the provisions as
narrowed. The Company reserves all rights to seek any and all remedies and damages permitted under law, including, but not limited
to, injunctive relief, equitable relief, and compensatory damages for any breach of the Participant’s obligations under this
Section 7.

 

    	 	7

    	 

    

(2)Forfeiture
of Restricted Stock. Without limiting the generality of the remedies available to the Company pursuant to Section 7B(1),
if the Participant, except with the prior written consent of the Company, materially breaches the restrictive covenants contained
in this Section 7, the Participant shall: (a) forfeit any Restricted Stock granted pursuant to this grant (whether vested
or unvested); and (b) pay to the Company in cash any net after-tax gain the Participant realized in cash in connection with the
sale of vested shares of Restricted Stock granted hereunder. These rights of forfeiture and recoupment are in addition to any other
remedies the Company may have against the Participant for the Participant’s breach of the restrictive covenants contained
in this Section 7.

 

(3)Cumulative
Obligations. The Participant’s obligations under this Section 7 shall be cumulative (but not duplicative, nor operate
to extend the length of any such obligations) of any similar obligations the Participant has under the Plan or any other agreement
with the Company or any of its Subsidiaries.

 

8.Code Section
409A. It is intended that this award comply with Code Section 409A or an exemption to Code Section 409A. To the extent
that the Company determines that the Participant would be subject to the additional 20% tax imposed on certain nonqualified deferred
compensation plans pursuant to Code Section 409A as a result of any provision of this Agreement, such provision shall be deemed
amended to the minimum extent necessary to avoid application of such additional tax. The nature of any such amendment shall be
determined by the Company.

 

    	 	8

    	 

    

 

9.Securities
Law Matters. Except as otherwise provided in a registration rights agreement, the Participant agrees that, in the event
that the Company files a registration statement under the Act with respect to a Public Offering of any shares of its capital stock,
the Participant agree that he or she will not effect any sale or distribution of any shares of the Restricted Stock, including
but not limited to, pursuant to Rule 144 under the Act, within seven days prior to and 180 days (or such shorter period as
the managing underwriter for any underwritten offering may agree) after the effective date of the registration statement relating
to such registration (the “Trigger Date”), except as part of such registration or unless, in the case of a sale
or distribution not involving a Public Offering, the transferee agrees in writing to be subject to this Section 9; provided
that with respect to any shelf registration statement on Form S-3, the Trigger Date shall be the pricing of any offering made
under such registration statement and the Participant agrees to execute a customary holdback agreement with the underwriters for
any such Public Offering.

 

10.Miscellaneous.

 

A.Notices.
All notices, requests, demands, letters, waivers, and other communications required or permitted to be given under this Agreement
shall be in writing and shall be deemed to have been duly given if (i) delivered personally, (ii) mailed,
certified or registered mail with postage prepaid, (iii) sent by next-day or overnight mail or delivery, or (iv) sent
by fax, as follows:

 

If to the Company,
to:

 

Sterling Holdco, Inc.

c/o Providence Equity Partners L.L.C.

50 Kennedy Plaza

18th Floor

Providence, Rhode Island 02903

Fax: +1 (401) 751-1790

Attention: Christopher C. Ragona

 

with copies to:

 

SRA International,
Inc.

4300 Fair Lakes Court

Fairfax, Virginia 22033

Fax: +1 (703) 803-1509

Attention: General Counsel

 

    	 	9

    	 

    

If to the Participant,
to the Participant’s last known home address, or to such other person or address as any party shall specify by notice in
writing to the Company.

 

All such notices, requests,
demands, letters, waivers, and other communications shall be deemed to have been received (w) if by personal delivery,
on the day after such delivery, (x) if by certified or registered mail, on the fifth business day after the mailing
thereof, (y) if by next-day or overnight mail or delivery, on the day delivered, or (z) if by fax, on the
day delivered, provided that such delivery is confirmed.

B.Data Privacy.
In order to administer the Plan and the terms of this Agreement, the Company may process personal data about the Participant. Such
data includes, but is not limited to, the information provided in this Agreement and any changes thereto, other appropriate personal
and financial data about the Participant, payroll information, and any other information that might be deemed appropriate by the
Company to facilitate the administration of the Plan. By accepting this grant of Restricted Stock, the Participant gives explicit
consent to the Company to process any such personal data.

 

C.Binding Effect;
Benefits. This Agreement shall be binding upon and inure to the benefit of the Company, it successors and assigns, and to the
Participant and his or her personal representatives and assigns. 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 assigns any legal
or equitable right, remedy, or claim under or in respect of any agreement or any provision contained herein.

 

D.Retention Rights.
This Agreement does not give the Participant the right to be retained or employed by the Company (or any Subsidiary) in any capacity.
The Company (and any Subsidiary) reserves the right to terminate the Participant’s employment at any time and for any reason.

 

E.Waiver.
Either party hereto may by written notice to the other: (i) extend the time for the performance of any of the obligations
or other actions of the other under this Agreement; (ii) waive compliance with any of the conditions or covenants of the other
contained in this Agreement; and (iii) waive or modify performance of any of the obligations of the other under this Agreement.
Except as provided in the preceding sentence, no action taken pursuant to this Agreement, including, without limitation, any investigation
by or on behalf of either party, shall be deemed to constitute a waiver by the party taking such action of compliance with any
representations, warranties, covenants, or agreements contained herein. The waiver by either party hereto of a breach of any provision
of this Agreement shall not operate or be construed as a waiver of any preceding or succeeding breach and no failure by either
party to exercise any right or privilege hereunder shall be deemed a waiver of such party’s rights or privileges hereunder
or shall be deemed a waiver of such party’s rights to exercise the same at any subsequent time or times hereunder.

 

    	 	10

    	 

    

F.Applicable Law.
This Agreement shall be governed by and construed in accordance with the law of the State of Delaware, regardless of the law that
might be applied under principles of conflict of laws.

 

G.Section and
Other Headings. 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.

 

H.Amendment.
In addition to any right of the Committee to amend or modify the terms of the Restricted Stock as set forth in the Plan or this
Agreement, the terms of this Agreement may be amended or modified at any time, by an instrument in writing signed by both parties
hereto.

 

I.Entire Agreement.
This Agreement, the Management Stockholders Agreement, and the Plan set forth the entire understanding and agreement of the Participant
and the Company with respect to any shares of Restricted Stock granted hereunder to Participant, and supersede any and all other
understandings, commitments, term sheets, negotiations, or agreements of or between the Participant and the Company relating to
Restricted Stock of the Company; provided, however, that the restrictions set forth in Section 7 shall not supersede any other
agreement into which Participant has entered with the Company or its Subsidiaries pertaining to post-employment activities.

 

J.Counterparts.
This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original and all of which
together shall be deemed to be one and the same instrument.

 

    	 	11

    	 

    

IN WITNESS WHEREOF, the
Company and the Participant have duly executed this Agreement as of the date first above written.

 

STERLING HOLDCO, INC.

 

 

By:_________________________________

Name:______________________________

Title:_______________________________

 

PARTICIPANT

 

____________________________________

«First_Name» «Last_Name»

    	 	12

    	 

    

Exhibit A

 

 

 

Sterling Holdco, Inc.

 

JOINDER AGREEMENT

 

Date: _______________

 

Reference is made to
that certain Management Stockholders Agreement of Sterling Holdco, Inc. (the “Company”), dated as of February
9, 2012, a copy of which is attached hereto (as amended from time to time, the “Management Stockholders Agreement”).

 

The undersigned signatory,
in order to become the owner or holder of shares of any class of the capital stock of the Company, by virtue of the issuance by
the Company of shares of capital stock to such signatory and/or the transfer of shares of capital stock to such signatory, hereby
agrees that by the undersigned’s execution hereof, the undersigned is a party to the Management Stockholders Agreement subject
to all of the rights, restrictions, conditions, and obligations applicable to the Management Stockholders (as that term is defined
in the Management Stockholders Agreement) set forth in the Management Stockholders Agreement. This Joinder Agreement shall take
effect and shall become a part of said Management Stockholders Agreement as of the date first written above (or, if earlier, the
effective date of the relevant issuance or transfer of the shares of capital stock to the undersigned).

 

______________________________

[EMPLOYEE NAME]

 

 

ACCEPTED:

 

 

STERLING HOLDCO, INC.

 

By: ____________________________________

Name:

Title:

    	 	13

    	 

    

Exhibit B

 

 

Section 83(b)
Election

 

The undersigned taxpayer
hereby elects, pursuant to § 83(b) of the Internal Revenue Code of 1986, as amended, to include in gross income as compensation
for services the excess (if any) of the fair market value of the shares described below over the amount (if any) paid for those
shares.

 

		1.	The name, taxpayer identification number, address of the undersigned, and the taxable year for
which this election is being made are:

 

TAXPAYER’S
NAME: [ ]

TAXPAYER’S
SOCIAL SECURITY NUMBER: [ ]

ADDRESS:
[ ]

TAXABLE YEAR:
Calendar Year 20[___]

 

		2.	The property which is the subject of this election is [_____] shares of common stock of Sterling
Holdco, Inc. (the “Company”).

 

		3.	The property was transferred to the undersigned effective as of July 1, 2013.

 

		4.	The property is subject to the following restrictions:

 

The shares of stock are subject
to a risk of forfeiture and other restrictions under the terms of a Restricted Stock Plan sponsored by the Company; of a Restricted
Stock Agreement between the Company and the undersigned; and of the Company’s Management Stockholders Agreement.

 

		5.	The fair market value of the property at the time of transfer (determined without regard to any
restriction other than a nonlapse restriction as defined in § 1.83-3(h) of the Income Tax Regulations) is: $XXX per share
x [______] shares = $[ ].

 

		6.	For the property transferred, the undersigned paid no consideration ($0.00).

 

		7.	The amount to include in gross income is $[ ].  

 

The undersigned taxpayer
will file this election with the Internal Revenue Service office with which taxpayer files his or her annual income tax return
not later than 30 days after the date of transfer of the property. A copy of the election also will be furnished to the person
for whom the services were performed. Additionally, the undersigned will include a copy of the election with his or her income
tax return for the taxable year in which the property is transferred. The undersigned is the person performing the services in
connection with which the property was transferred.

 

______________________________

Taxpayer

Dated:

    	 	14

    	 

    

PROCEDURES FOR U.S.
PARTICIPANT MAKING ELECTION UNDER INTERNAL REVENUE CODE SECTION 83(B)

 

 

 

The following procedures
must be followed with respect to the attached form for making an election under Internal Revenue Code Section 83(b) in order for
the election to be effective.1

 

		1.	You must file one copy of the completed election form with the IRS Service Center where you file
your federal income tax returns within 30 days after the Grant Date of your Restricted Stock.

 

		2.	At the same time you file the election form with the IRS, you must also give a copy of the election
form to the Secretary of the Company.

 

		3.	You must file another copy of the election form with your federal income tax return (generally,
Form 1040) for the taxable year in which the stock is transferred to you.

 

 

1
Whether or not to make the election is your decision and may create tax consequences for you. You are advised to consult your tax
advisor if you are unsure whether or not to make the election.

 

    	 	15

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