Document:

EX-10.3

 Exhibit 10.3 

INTEGRAL AD SCIENCE HOLDING CORP. 

2021 OMNIBUS INCENTIVE PLAN 

ARTICLE I 
 PURPOSE;
EFFECTIVE DATE; TERM 
 Section 1.1    Purpose. The purpose of the Integral Ad Science Holding Corp.
2021 Omnibus Incentive Plan is to enhance the profitability and value of the Company for the benefit of its Stockholders by enabling the Company to offer Eligible Individuals stock- and cash-based incentives in order to attract, retain, and
reward such individuals and strengthen the mutuality of interests between such individuals and the Stockholders. 

Section 1.2    Effective Date. The Plan is effective as of June 29, 2021 (the “Effective
Date”), which is the date of its adoption by the Board, subject to the approval of the Plan by the Stockholders in accordance with Applicable Law. 

Section 1.3    Term. No Award may be granted on or after the 10th anniversary of the earlier of the Effective
Date or the date of Stockholder approval of the Plan, but Awards granted before such 10th anniversary may extend beyond that date. 

ARTICLE II 

DEFINITIONS 
 For purposes
of the Plan, the following terms will have the following meanings: 
 “Affiliate” means each of the following: (a) any
Subsidiary; (b) any Parent; (c) any corporation, trade, or business that is directly or indirectly controlled 50% or more (whether by ownership of stock, assets, or an equivalent ownership interest or voting interest) by the Company or any
Affiliate; (d) any trade or business that directly or indirectly controls 50% or more (whether by ownership of stock, assets, or an equivalent ownership interest or voting interest) of the Company; and (e) any other entity in which the
Company or any Affiliate has a material equity interest and that is designated as an “Affiliate” by resolution of the Committee; provided, however, that “Affiliate” will not include other portfolio companies of any
fund controlled by Vista or any of its affiliates that are not Parents or Subsidiaries. 
 “Applicable Law” means the
requirements related to or implicated by the administration or operation of the Plan under United States federal and applicable state laws (including corporate, securities, tax, and employment laws, and the Code), any stock exchange or quotation
system on which the Shares are listed or quoted, and the applicable laws of any foreign country or jurisdiction where Awards are granted. 

“Award” means any award granted under the Plan of any Stock Option, Stock Appreciation Right, Restricted Shares, Performance
Award, Other Share-Based Award, or Other Cash-Based Award. All Awards will be granted by, confirmed by, and subject to the terms and conditions of, a written Award Agreement executed by the Company and the Participant. 

“Award Agreement” means the written or electronic agreement setting forth the terms and conditions applicable to an Award.

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

“Business Combination” has the meaning set forth in Section 11.2(c). 

“Cause” means, as determined by the Company, unless otherwise determined by the Committee in the applicable Award Agreement,
with respect to an Eligible Employee’s or Consultant’s Separation from Service, the following: (a) in the case where there is no employment agreement, consulting agreement, change in control agreement, or similar agreement in effect
between the Company or an Affiliate and the Participant at the time of the grant of the Award (or where there is such an agreement but it does not define “cause” (or words of like import)), a Participant’s (i) insubordination,
material dishonesty, fraud, moral turpitude, negligence or willful misconduct, refusal to perform the Participant’s duties or responsibilities (for any reason other than illness or incapacity), (ii) repeated or material violation of any
policies of the Company, including, but not limited to, those relating to sexual harassment, ethics, discrimination, or the disclosure or misuse of confidential information, or violation or breach of any confidentiality agreement, work product
agreement, or other agreement between the Participant and the Company, (iii) plea of guilty or nolo contendere to, conviction of, or indictment for, any crime (whether or not involving the Company or its Affiliates) (A) constituting
a felony or (B) that has, or could reasonable expected result in, and adverse impact on the performance of the Participant’s duties to the Company or any of its Affiliates, (iv) misappropriation of any assets or business opportunities
of the Company or its Affiliates; or (b) in the case where there is an employment agreement, consulting agreement, change in control agreement, or similar agreement in effect between the Company or an Affiliate and the Participant at the time
of the grant of the Award that defines “cause” (or words of like import), “cause” as defined under such agreement. Notwithstanding any foregoing term or condition of this definition of Cause, with respect to a Non-Employee Director, “Cause” means an act or failure to act that constitutes cause for removal of a director under applicable Delaware law. 

“Change in Control” has the meaning set forth in Section 11.2. 

“Change in Control Price” has the meaning set forth in Section 11.1. 

“Code” means the Internal Revenue Code of 1986, as amended from time to time, including the rules and regulations thereunder
and any successor provisions, rules, and regulations thereto. 
 “Committee” means any committee of the Board duly
authorized by the Board to administer the Plan. If no committee is duly authorized by the Board to administer the Plan, “Committee” will be deemed to refer to the Board for all purposes under the Plan. 

“Common Stock” means the shares of common stock, par value USD 0.01 per share, of the Company. 

“Company” means Integral Ad Science Holding Corp., a Delaware corporation, and its successors by operation of law. 

“Consultant” means an advisor or consultant to the Company or an Affiliate. 

 “Detrimental Conduct” means, as reasonably determined by the Company, the
Participant’s engaging in any of the following behaviors, provided that such behavior causes or would be reasonably expected to cause material harm to the Company or an Affiliate: (a) any violation by the Participant of a restrictive
covenant agreement that the Participant has entered into with the Company or an Affiliate (covering, for example, confidentiality, noncompetition, nonsolicitation, nondisparagement, etc.); (b) the commission of a criminal act by the Participant
while employed by or providing services to the Company or an Affiliate, whether or not performed in the workplace, that subjects, or if generally known would subject, the Company or an Affiliate to public ridicule or embarrassment, or other improper
or intentional conduct by the Participant while employed by or providing services to the Company or an Affiliate causing reputational harm to the Company or an Affiliate; (c) the Participant’s breach of a fiduciary duty owed to the Company
or an Affiliate or a client or former client of the Company or an Affiliate; (d) the Participant’s intentional violation, or grossly negligent disregard, of the Company’s or an Affiliate’s policies, rules, or procedures; or
(e) the Participant taking or maintaining trading positions that result in a need to restate financial results in a subsequent reporting period or that result in a significant financial loss to the Company or an Affiliate. 

“Disability” means, unless otherwise determined by the Committee in the applicable Award Agreement, with respect to a
Participant’s Separation from Service, a permanent and total disability as defined in Section 22(e)(3) of the Code. A Disability will only be deemed to occur at the time of the determination by the Committee of the Disability;
provided, however, that, for Awards that are subject to Section 409A, Disability means that a Participant is disabled within the meaning of Section 409A. 

“Effective Date” has the meaning set forth in Section 1.2. 

“Eligible Employee” means each employee of the Company or an Affiliate. 

“Eligible Individual” means each Eligible Employee, Non-Employee Director, or
Consultant who is designated by the Committee as eligible to receive an Award. 
 “Exchange Act” means the Securities
Exchange Act of 1934, as amended from time to time, including the rules and regulations thereunder and any successor provisions, rules, and regulations thereto. 

“Fair Market Value” means, as of any date and except as provided below, the last sales price reported for the Common Stock on
the applicable date as reported on the principal stock exchange in the United States on which the Common Stock is then listed, or if the Common Stock is not listed, or otherwise reported or quoted, the Committee will determine the Fair Market Value
taking into account the requirements of Section 409A. For purposes of the grant of any Award, the applicable date will be the trading day immediately before the date on which the Award is granted. For purposes of any Award granted in connection
with the Registration Date, the Fair Market Value will be the public offering price in the initial public offering as set forth on the cover of the final prospectus. For purposes of the purchase of any Award, the applicable date will be the date a
notice of purchase is received by the Company or, if not a day on which the applicable market is open, the next day that it is open. Notwithstanding the foregoing, the Committee may use any alternative definition of Fair Market Value that it
determines should be used in connection with 

 
the grant, exercise, vesting, settlement, or payment of any Award. Such alternative definition may include a price that is based on the opening, actual, high, low, or average selling prices of
the Common Stock on the applicable stock exchange on the given date, the trading day preceding the given date, the trading day next succeeding the given date, or an average of trading days. 

“Family Member” of a Participant means the Participant’s child, stepchild, grandchild, parent, stepparent, grandparent,
spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law,
brother-in-law, or sister-in-law, including adoptive relationships, any person sharing
the Participant’s household (other than a tenant or employee), a trust in which these persons have more than 50% of the beneficial interest, a foundation in which these persons (or the Participant) control the management of assets, and any
other entity in which these persons (or the Participant) own more than 50% of the voting interests. 
 “GAAP” means the
U.S. Generally Accepted Accounting Principles, as in effect from time to time. 
 “Incentive Stock Option” or
“ISO” means any Stock Option awarded to an Eligible Employee of the Company, its Subsidiaries, or any Parent intended to be, qualifying, and designated as an “incentive stock option” within the meaning of Section 422
of the Code. 
 “Incumbent Directors” has the meaning set forth in Section 11.2(b). 

“Lead Underwriter” has the meaning set forth in Section 13.21. 

“Lock-Up Period” has the meaning set forth in
Section 13.21. 
 “Non-Employee Director” means a member
of the Board or the board of directors of an Affiliate who is not an active employee of the Company or an Affiliate. 

“Nonqualified Stock Option” means any Stock Option that is not an ISO. 

“Other Cash-Based Award” means an award granted to an Eligible Individual under Section 10.3 that
is payable in cash at the time or times and subject to the terms and conditions determined by the Committee. 
 “Other Share-Based
Award” means an award granted to an Eligible Individual under Article X that is valued in whole or in part by reference to, or is payable in or otherwise based on, Common Stock, including an award valued by
reference to an Affiliate. Other Share-Based Awards may include RSUs. 
 “Parent” means any parent corporation of the
Company within the meaning of Section 424(e) of the Code. 
 “Participant” means an Eligible Individual who has been
granted, and holds, an Award. 
 “Performance Award” means an award granted to an Eligible Individual under
Article IX contingent upon achieving specified Performance Goals. 

 “Performance Goals” means goals established by the Committee as
contingencies for Awards to vest or become exercisable or distributable, which may be based on business objectives or other measures of performance as the Committee, in its discretion, deems appropriate. Performance Goals may differ among Awards
granted to any one Participant or to different Participants. The Committee may also designate additional business objectives on which the Performance Goals may be based and adjust, modify, or amend the aforementioned business objectives. 

“Performance Period” means the designated period during which Performance Goals must be satisfied with respect to a
Performance Award. 
 “Person” means an individual, a partnership, a corporation, a limited liability company, an
association, a joint stock company, a trust, a joint venture, an unincorporated organization, or a government or any branch, department, agency, political subdivision, or official thereof. 

“Plan” means this Integral Ad Science Holding Corp. 2021 Omnibus Incentive Plan. 

“Proceeding” has the meaning set forth in Section 13.10. 

“Registration Date” means the date on which the Company consummates the initial sale of its Common Stock in a bona
fide, firm commitment underwriting pursuant to an effective registration statement under the Securities Act. 
 “Restricted
Shares” means restricted Shares granted to an Eligible Individual under Article VIII. 

“Restriction Period” has the meaning set forth in Section 8.3(a). 

“RSUs” has the meaning set forth in Section 10.1. 

“Rule 16b-3” means Rule 16b-3 under
Section 16(b) of the Exchange Act. 
 “Section 409A” means Code Section 409A. 

“Securities Act” means the Securities Act of 1933, as amended from time to time, including the rules and regulations
thereunder and any successor provisions, rules, and regulations thereto. 
 “Separation from Service” means, unless
otherwise determined by the Committee or the Company, the termination of the applicable Participant’s employment with, and performance of services for, the Company and all Affiliates, including by reason of the fact that the Participant’s
employer or other service recipient ceases to be an Affiliate of the Company. Unless otherwise determined by the Company, if a Participant’s employment or service with the Company or an Affiliate terminates but the Participant continues to
provide services to the Company or an Affiliate in a Non-Employee Director capacity or as an Eligible Employee or Consultant, as applicable, such change in status will not be considered a Separation from
Service. Approved temporary absences from employment because of illness, vacation, or leave of absence and transfers among the Company and its Affiliates will not be considered Separations from Service. Notwithstanding

 
the foregoing definition of Separation from Service, with respect to any Award that constitutes nonqualified deferred compensation under Section 409A, “Separation from Service”
means a “separation from service” within the meaning of Section 409A. 
 “Share” means a share of Common
Stock. 
 “Share Reserve” has the meaning set forth in Section 4.1. 

“Stock Appreciation Right” means a right granted to an Eligible Individual under Article VII to
receive an amount in cash or Shares equal to the difference between (a) the Fair Market Value of a Share on the date such right is exercised and (b) the per Share exercise price of such right. 

“Stock Option” means an option to purchase Shares granted to an Eligible Individual under
Article VI. 
 “Stockholder” means a stockholder of the Company. 

“Subsidiary” means any subsidiary corporation of the Company within the meaning of Section 424(f) of the Code. 

“Substitute Award” has the meaning set forth in Section 4.1. 

“Ten Percent Stockholder” means a Person owning stock possessing more than 10% of the total combined voting power of all
classes of stock of the Company, its Subsidiaries, or any Parent. 
 “Transfer” means (a) when used as a noun, any
direct or indirect transfer, sale, assignment, pledge, hypothecation, encumbrance, or other disposition, whether for value or no value and whether voluntary or involuntary, and (b) when used as a verb, to directly or indirectly transfer, sell,
assign, pledge, encumber, charge, hypothecate, or otherwise dispose of, whether for value or for no value and whether voluntarily or involuntarily. The terms “Transferred” and “Transferable” have a correlative
meaning under the Plan. 
 “Vista” means Vista Equity Partners. 

ARTICLE III 

ADMINISTRATION1 

Section 3.1    Committee. The Plan will be administered and interpreted by the Committee; provided that
the Board will retain the right to exercise the authority of the Committee to the extent consistent with Applicable Law. To the extent required by Applicable Law, it is intended that each member of the Committee will qualify as (a) a “non-employee director” under Rule 16b-3 and (b) an “independent director” under the rules of the principal stock exchange in 

 

	1 	 Note to IAS: Baker noted that sub-plans will only be required if
IAS decides to grant tax-advantaged awards in certain countries (France and the UK for example). It is our understanding this will not be the case but please confirm.

 
the United States on which the Common Stock is then listed, as applicable. If it is later determined that one or more members of the Committee do not so qualify, actions taken by the Committee
before such determination will be valid despite such failure to qualify. 
 Section 3.2    Grants of Awards.
The Committee will have full authority to grant, under the terms and conditions of the Plan, to Eligible Individuals: Stock Options, Stock Appreciation Rights, Restricted Shares, Performance Awards, Other Share-Based Awards, and Other Cash-Based
Awards. In particular, the Committee will have the authority: 
 (a)    to select the Eligible
Individuals to whom Awards may be granted; 
 (b)    to determine whether and to what extent Awards, or
any combination thereof, are to be granted to one or more Eligible Individuals; 
 (c)    to determine
the number of Shares to be covered by each Award; 
 (d)    to determine the terms and conditions, not
inconsistent with the terms and conditions of the Plan, of all Awards; 
 (e)    to determine the amount
of cash to be covered by each Award; 
 (f)    to determine whether, to what extent, and under what
circumstances grants of Stock Options and other Awards are to operate on a tandem basis or in conjunction with or apart from other awards made by the Company outside of the Plan; 

(g)    to determine whether and under what circumstances an Award may be settled in cash, Common Stock, or
Restricted Shares under Section 6.3(d) or as otherwise provided for herein; 
 (h)    to
determine whether a Stock Option is an ISO or Nonqualified Stock Option; 
 (i)    to impose a
“blackout” period during which Stock Options and/or Stock Appreciation Rights may not be exercised; 

(j)    to determine whether to require a Participant, as a condition of the granting of any Award, to not
sell or otherwise dispose of Shares acquired upon the vesting and/or exercise of an Award for a period of time as determined by the Committee after the date of the acquisition of such Award; 

(k)    to modify, extend, or renew an Award, subject to Section 6.3(g) and
Article XII or as otherwise contained herein; and 
 (l)    solely to the
extent permitted by Applicable Law, to determine whether, to what extent, and under what circumstances to provide loans (which may be on a recourse basis and bear interest at the rate the Committee may determine) to Participants in order to exercise
Stock Options. 

 Section 3.3    Guidelines. Subject to
Article XII, the Committee will have the authority to adopt, alter, and repeal such administrative rules, guidelines, and practices governing the Plan and perform all acts, including the delegation of its responsibilities
(to the extent permitted by Applicable Law and not inconsistent with the Plan), as it may deem advisable; to construe and interpret the Plan, all Awards, and all Award Agreements (and in each case any agreements relating thereto); and to otherwise
supervise the administration of the Plan. The Committee may correct any defect, supply any omission, or reconcile any inconsistency in the Plan or in any agreement relating thereto in the manner and to the extent it deems necessary to effectuate the
purpose and intent of the Plan. The Committee may adopt special terms and conditions for Persons who are residing in, or employed in, or subject to the taxes of, any domestic or foreign jurisdictions to comply with Applicable Law. Notwithstanding
the foregoing terms and conditions of this Section 3.3, no action of the Committee under this Section 3.3 may materially impair the rights of any Participant under the Plan or any Award without the
Participant’s consent. To the extent applicable, the Plan is intended to comply with the applicable requirements of Rule 16b-3, and the Plan will be limited, construed, and interpreted in a manner so
as to comply therewith. 
 Section 3.4    Sole Discretion; Decisions Final. Any decision, interpretation, or
other action made or taken by or at the direction of the Company, the Board, or the Committee (or any of their members) arising out of or in connection with the Plan will be within the sole and absolute discretion of all and each of them, as the
case may be, and will be final, binding, and conclusive on the Company and all employees and Participants and their respective heirs, executors, administrators, successors, and assigns and all other Persons having an interest in the Plan. 

Section 3.5    Designation of Consultants; Delegation of Authority. 

(a)    The Committee may designate employees of the Company and professional advisors to assist the
Committee in the administration of the Plan and may grant authority to officers to grant Awards and execute agreements and other documents on behalf of the Committee, in each case to the extent permitted by Applicable Law. In the event of any
designation of authority hereunder, subject to Applicable Law and any terms and conditions imposed by the Committee in connection with such designation, such designee or designees will have the power and authority to take such actions, exercise such
powers, and make such determinations that are otherwise specifically designated to the Committee hereunder. 

(b)    The Committee may employ such legal counsel, consultants, and agents as it may deem desirable for
the administration of the Plan and may rely upon any opinion received from any such counsel or consultant and any computation received from any such consultant or agent. Expenses incurred by the Committee or the Board in the engagement of any such
counsel, consultant, or agent will be paid by the Company. The Committee, its members, and any Person designated under Section 3.5(a) will not be liable for any action or determination made in good faith with respect to the
Plan. To the maximum extent permitted by Applicable Law, no officer of the Company or member or former member of the Committee or of the Board will be liable for any action or determination made in good faith with respect to the Plan or any Award.

 (c)    The Committee may delegate any or all of its
powers and duties under the Plan to a subcommittee of directors or to any officer of the Company, including the power to perform administrative functions and grant Awards, provided that such delegation does not (i) violate Applicable Law, or
(ii) result in the loss of an exemption under Rule 16b-3(d)(1) for Awards granted to Participants subject to Section 16 of the Exchange Act in respect of the Company. Upon any such delegation, all
references in the Plan to the “Committee,” shall be deemed to include any subcommittee or officer of the Company to whom such powers have been delegated by the Committee. Any such delegation shall not limit the right of such subcommittee
members or such an officer to receive Awards. The Committee may also appoint agents of the Company to assist in administering the Plan, provided, however, that such individuals may not be delegated the authority to grant or modify any Awards that
will, or may, be settled in Shares. 
 Section 3.6    Indemnification. To the maximum extent permitted by
Applicable Law and the Certificate of Incorporation and By Laws of the Company and to the extent not covered by insurance directly insuring such Person, each officer and employee of the Company and each Affiliate and member or former member of the
Committee and the Board will be indemnified and held harmless by the Company against all costs and expenses and liabilities, and advanced amounts necessary to pay the foregoing at the earliest time and to the fullest extent permitted, arising out of
any act or omission to act in connection with the administration of the Plan, except to the extent arising out of such officer’s, employee’s, member’s, or former member’s own fraud or bad faith. Such indemnification will be in
addition to any right of indemnification the employees, officers, directors, or members or former officers, directors, or members may have under Applicable Law or under the Certificate of Incorporation or By Laws of the Company or an Affiliate.
Notwithstanding any other term or condition of the Plan, this indemnification will not apply to the actions or determinations made by an individual with regard to Awards granted to himself or herself. 

ARTICLE IV 
 SHARE
LIMITATION 
 Section 4.1    Shares. 

(a)    Share Limits and Counting. The maximum number of Shares available for issuance under the Plan
may not exceed 21,200,000 Shares (subject to any increase or decrease under this Section 4.1 or Section 4.2) (the “Share Reserve”). The Share Reserve may consist of authorized and
unissued Shares and Shares held in or acquired for the treasury of the Company. The Share Reserve will automatically increase on each January 1 that occurs after the Effective Date, for 10 years, by an amount equal to 5% of the total
number of Shares outstanding on December 31 of the preceding calendar year, or a lesser number as may be determined by the Board. The maximum number of Shares with respect to which ISOs may be granted is 21,200,000 Shares. With respect to Stock
Appreciation Rights settled in Shares, upon settlement, only the number of Shares delivered to a Participant will count against the Share Reserve. If any Stock Option, Stock Appreciation Right, or Other Share-Based Award expires, terminates, or is
cancelled for any reason without having been exercised in full, the number of Shares underlying such Award will be added back to the Share Reserve. If any Restricted Shares, Performance Awards, or 

 
Other Share-Based Awards denominated in Shares are forfeited for any reason, the number of Shares underlying such Award will be added back to the Share Reserve. Any Award settled in cash will not
count against the Share Reserve. If Shares issuable upon exercise, vesting, or settlement of an Award, or Shares owned by a Participant (that are not subject to any pledge or other security interest), are surrendered or tendered to the Company in
payment of the purchase or exercise price of an Award or any taxes required to be withheld in respect of an Award, in each case, in accordance with the terms of the Plan, such surrendered or tendered Shares will be added back to the Share Reserve.
Awards may be granted in assumption of, or in substitution for, outstanding awards previously granted by an entity acquired by the Company or with which the Company combines (“Substitute Awards”). Substitute Awards will not count
against the Share Reserve; provided that Substitute Awards issued in connection with the assumption of, or in substitution for, outstanding Stock Options intended to qualify as ISOs will count against the ISO limit above. Subject to
applicable stock exchange requirements, available shares under a stockholder-approved plan of an entity acquired by the Company or with which the Company combines (as appropriately adjusted to reflect such acquisition or transaction) may be used for
Awards and will not count against the Share Reserve. 
 (b)    Annual
Non-Employee Director Award Limitation. The maximum value of Awards granted during any calendar year to any Non-Employee Director for such individual’s service
on the Board, taken together with any cash fees paid to that Non-Employee Director during the calendar year and the value of awards granted to the Non-Employee Director
under any other compensation plan of the Company or any Affiliate during the calendar year for such individual’s service on the Board, may not exceed USD 750,000 in total value (calculating the value of any such Awards based on the grant
date fair value for accounting purposes); provided, that for any calendar year in which a Non-Employee Director (i) first commences service on the Board, (ii) serves on a special committee of the
Board, or (iii) serves as lead director or non-executive chair of the Board, additional compensation may be provided to such Non-Employee Director in excess of such
limit; provided, further, that the limit set forth in this Section 4.1(b) shall be applied without regard to Awards or other compensation, if any, provided to a Non-Employee Director during any period in
which such individual was an employee of the Company or any Affiliate or was otherwise providing services to the Company or to any Affiliate other than in the capacity as a Non-Employee Director. 

Section 4.2    Changes. 

(a)    The existence of the Plan and any Awards will not affect in any way the right or power of the Board,
the Committee, or the Stockholders to make or authorize (i) any adjustment, recapitalization, reorganization, or other change in the Company’s capital structure or its business, (ii) any merger or consolidation of the Company or any
Affiliate, (iii) any issuance of bonds, debentures, or preferred or prior preference stock ahead of or affecting the Common Stock, (iv) the dissolution or liquidation of the Company or any Affiliate, (v) any sale or transfer of all or
part of the assets or business of the Company or any Affiliate, or (vi) any other corporate act or proceeding. 
  

 (b)    Subject to
Section 11.1: 
 (i)    In the event of any change in the outstanding Common
Stock or in the capital structure of the Company by reason of any stock split, reverse stock split, recapitalization, reorganization, merger, consolidation, combination, division, exchange, spin off, extraordinary cash or stock dividend, or other
relevant change in capitalization, Awards will be equitably adjusted or substituted to the extent necessary to preserve the economic intent of such Awards. 

(ii)    Fractional Shares resulting from any adjustment in Awards under this
Section 4.2(b) will be aggregated until, and eliminated at, the time of exercise or payment by rounding to the nearest whole number. No cash settlements will be required with respect to fractional Shares eliminated by
rounding. Notice of any adjustment will be given by the Committee to each Participant whose Award has been adjusted and such adjustment (whether or not such notice is given) will be effective and binding for all purposes of the Plan. 

Section 4.3    Minimum Purchase Price. Notwithstanding any other term or condition of the Plan, if authorized
but previously unissued Shares are issued under the Plan, such Shares may not be issued for a consideration that is less than as permitted under Applicable Law. 

ARTICLE V 

ELIGIBILITY 

Section 5.1    General Eligibility. All current and prospective Eligible Individuals are eligible to be
granted Awards. Eligibility for the grant of Awards and actual participation in the Plan will be determined by the Committee. 

Section 5.2    ISOs. Notwithstanding Section 5.1, only Eligible Employees of the
Company, its Subsidiaries, and any Parent are eligible to be granted ISOs. 
 Section 5.3    General
Requirement. The vesting and exercise of Awards granted to a prospective Eligible Individual must be conditioned upon such individual actually becoming an Eligible Employee, Consultant, or Non-Employee
Director, respectively. 
 ARTICLE VI 

STOCK OPTIONS 

Section 6.1    Stock Options. Stock Options may be granted alone or in addition to other Awards. Each Stock
Option will be either (a) an ISO or (b) a Nonqualified Stock Option. 
 Section 6.2    Grants. The
Committee will have the authority to grant to any Eligible Employee one or more ISOs, Nonqualified Stock Options, or both types of Stock Options. The Committee will have the authority to grant any Consultant or
Non-Employee Director one or more Nonqualified Stock Options. To the extent that any Stock Option does not qualify as an ISO, such Stock Option or the portion thereof that does not so qualify will constitute a
separate Nonqualified Stock Option. 

 Section 6.3    Terms and Conditions of Stock Options. Stock
Options will be subject to terms and conditions, not inconsistent with the Plan, determined by the Committee, and the following: 

(a)    The exercise price per Share subject to a Stock Option will be determined by the Committee at the
time of grant; provided that the per Share exercise price of a Stock Option may not be less than 100% (or, in the case of an ISO granted to a Ten Percent Stockholder, 110%) of the Fair Market Value of the Common Stock at the grant date. 

(b)    The term of each Stock Option will be fixed by the Committee; provided that no Stock Option
may be exercisable more than 10 years after the date the Stock Option is granted; and provided, further, that the term of an ISO granted to a Ten Percent Stockholder may not exceed five years. 

(c)    Unless otherwise determined by the Committee in accordance with this
Section 6.3, Stock Options will be exercisable at the time or times and subject to the terms and conditions determined by the Committee at the time of grant. If the Committee provides that any Stock Option is exercisable
subject to certain terms and conditions, the Committee may waive those terms and conditions on the exercisability at any time at or after the time of grant in whole or in part. 

(d)    Subject to whatever installment exercise and waiting period terms and conditions that may apply
under Section 6.3(e), to the extent vested, Stock Options may be exercised in whole or in part at any time during the Stock Option term by giving written notice of exercise to the Company specifying the number of Shares to
be purchased. Such notice must be accompanied by payment in full of the exercise price as follows: (i) in cash or by check, bank draft, or money order payable to the Company; (ii) solely to the extent permitted by Applicable Law, if the
Common Stock is listed on a national stock exchange, and the Committee authorizes, through a procedure whereby the Participant delivers irrevocable instructions to a broker reasonably acceptable to the Committee to deliver promptly to the Company an
amount equal to the exercise price; (iii) to the extent the Committee authorizes, having the Company withhold Shares issuable upon exercise of the Stock Option, or by payment in full or in part in the form of Shares owned by the Participant,
based on the Fair Market Value of the Shares on the payment date; or (iv) on such other terms and conditions that may be acceptable to the Committee. No Shares will be issued under the Plan until payment for those Shares has been made or
provided for in accordance with the Plan. 
 (e)    No Stock Option will be Transferable by the
Participant other than by will or by the laws of descent and distribution, and all Stock Options will be exercisable, during the Participant’s lifetime, only by the Participant, except that the Committee may determine at the time of grant or
thereafter that a Nonqualified Stock Option that is otherwise not Transferable under this Section 6.3(e) is Transferable to a Family Member in whole or in part on terms and conditions that are specified by the Committee. A
Nonqualified Stock Option that is Transferred to a Family Member under the preceding sentence (i) may not be subsequently Transferred other than by will or by the laws of descent and distribution and (ii) remains subject to the Plan and
the applicable Award Agreement. Any Shares acquired upon the 

 
exercise of a Nonqualified Stock Option by a permissible transferee of a Nonqualified Stock Option or a permissible transferee under a Transfer after the exercise of the Nonqualified Stock Option
will be subject to the Plan and the applicable Award Agreement. 
 (f)    Treatment upon Separation
from Service 
 (i)    Unless otherwise determined by the Committee at the time of grant or, if no
rights of the Participant are reduced, thereafter, if a Participant’s Separation from Service is by reason of death or Disability, all Stock Options that are held by such Participant that are vested and exercisable at the time of the
Participant’s Separation from Service may be exercised by the Participant (or in the case of the Participant’s death, by the legal representative of the Participant’s estate) at any time within a period of 1 year from the date of such
Separation from Service, but in no event beyond the expiration of the stated term of such Stock Options; provided, however, that, in the event of a Participant’s Separation from Service by reason of Disability, if the Participant dies within
such exercise period, all unexercised Stock Options held by such Participant will thereafter be exercisable, to the extent to which they were exercisable at the time of death, for a period of 1 year from the date of such death, but in no event
beyond the expiration of the stated term of such Stock Options. 
 (ii)    Unless otherwise determined by
the Committee at the time of grant or, if no rights of the Participant are reduced, thereafter, if a Participant’s Separation from Service is initiated by the Company without Cause, all Stock Options that are held by such Participant that are
vested and exercisable at the time of the Participant’s Separation from Service may be exercised by the Participant at any time within a period of 90 calendar days after the date of such Separation from Service, but in no event beyond the
expiration of the stated term of such Stock Options. 
 (iii)    Unless otherwise determined by the
Committee at the time of grant or, if no rights of the Participant are reduced, thereafter, if a Participant’s Separation from Service is voluntary (other than a voluntary Separation from Service described in Section 6.4(i)(y)), all Stock
Options that are held by such Participant that are vested and exercisable at the time of the Participant’s Separation from Service may be exercised by the Participant at any time within a period of 90 calendar days after the date of such
Separation from Service, but in no event beyond the expiration of the stated term of such Stock Options. 

(iv)    Unless otherwise determined by the Committee at the time of grant or, if no rights of the
Participant are reduced, thereafter, Stock Options that are not vested as of the date of a Participant’s Separation from Service for any reason will terminate and expire as of the date of such Separation from Service. 

(g)    To the extent that the aggregate Fair Market Value (determined as of the time of grant) of the
Common Stock with respect to which ISOs are exercisable for the first 

 
time by an Eligible Employee during any calendar year under the Plan or any other stock option plan of the Company, any Subsidiary, or any Parent exceeds USD 100,000, such Stock Options will
be treated as Nonqualified Stock Options. In addition, if an Eligible Employee does not remain employed by the Company, any Subsidiary, or any Parent at all times from the time an ISO is granted until three months before the date of exercise thereof
(or such other period as required by Applicable Law), such Stock Option will be treated as a Nonqualified Stock Option. Should any term or condition of the Plan not be necessary for the Stock Options to qualify as ISOs, or should any additional
terms and conditions be required, the Committee may amend the Plan accordingly. 
 (h)    Subject to the
terms and conditions of the Plan, Stock Options will be evidenced by such form of agreement or grant as is approved by the Committee, and the Committee may (i) modify, extend, or renew outstanding Stock Options, and (ii) accept the
surrender of outstanding Stock Options (to the extent not theretofore exercised) and authorize the granting of new Stock Options in substitution therefor (to the extent not theretofore exercised). Notwithstanding any other term or condition of the
Plan, except in connection with a corporate transaction involving the Company in accordance with Section 4.2, the repricing of Options (and Stock Appreciation Rights) is prohibited without prior approval of the
Stockholders. For this purpose, a “repricing” means any of the following (or any other action that has the same effect as any of the following): (A) any action that is treated as a “repricing” under GAAP, and
(B) repurchasing for cash or cancelling an Option or a Stock Appreciation Right at a time when its exercise price is greater than the Fair Market Value of the underlying Shares in exchange for another Award. A cancellation and exchange under
clause (B) would be considered a “repricing” regardless of whether it is treated as a “repricing” under GAAP and regardless of whether it is voluntary on the part of the Participant. 

(i)    The Committee may provide that a Stock Option include a term or condition whereby the Participant
may elect at any time before the Participant’s Separation from Service to exercise the Stock Option as to any part or all of the Shares subject to the Stock Option before the full vesting of the Stock Option and such Shares will be subject to
the terms and conditions of Article VIII and be treated as Restricted Shares. Unvested Shares so exercised may be subject to a repurchase option in favor of the Company or to any other restriction the Committee may
determine. 
 Section 6.4    Automatic Exercise. The Committee may include a term or condition in an Award
Agreement providing for the automatic exercise of a Nonqualified Stock Option on a cashless basis on the last day of the term of such Stock Option if the Participant has failed to exercise the Nonqualified Stock Option as of such date, with respect
to which the Fair Market Value of the Shares underlying the Nonqualified Stock Option exceeds the exercise price of such Nonqualified Stock Option on the date of expiration of such Stock Option, subject to Section 13.5.

 ARTICLE VII 

STOCK APPRECIATION RIGHTS 

Section 7.1    Terms and Conditions of Stock Appreciation Rights. Stock Appreciation Rights may be issued
either alone or in tandem with Stock Options. Stock Appreciation Rights 

 
will be subject to terms and conditions, not inconsistent with the Plan, determined by the Committee, and the following: 

(a)    The exercise price per Share subject to a Stock Appreciation Right will be determined by the
Committee at the time of grant; provided that the per Share exercise price of a Stock Appreciation Right will not be less than 100% of the Fair Market Value of the Common Stock at the time of grant. 

(b)    The term of each Stock Appreciation Right will be fixed by the Committee, but may not be greater
than 10 years after the date the right is granted. 
 (c)    Unless otherwise determined by the
Committee in accordance with this Section 7.1, Stock Appreciation Rights will be exercisable at the time or times and subject to the terms and conditions determined by the Committee at the time of grant. If the Committee
provides that any such right is exercisable subject to certain terms and conditions, the Committee may waive those terms and conditions on the exercisability at any time at or after grant in whole or in part. 

(d)    Subject to whatever installment exercise and waiting period terms and conditions apply under
Section 7.1(c), Stock Appreciation Rights may be exercised in whole or in part at any time in accordance with the applicable Award Agreement, by giving written notice of exercise to the Company specifying the number of
Stock Appreciation Rights to be exercised. 
 (e)    Upon the exercise of a Stock Appreciation Right, a
Participant will be entitled to receive, for each right exercised, up to, but no more than, an amount in cash or Common Stock (as chosen by the Committee) equal in value to the excess of the Fair Market Value of one Share on the date that the right
is exercised over the Fair Market Value of one Share on the date that the right was awarded to the Participant. 

(f)    Unless otherwise determined by the Committee at the time of grant or, if no rights of the
Participant are reduced, thereafter, subject to the applicable Award Agreement and the Plan, upon a Participant’s Separation from Service for any reason, Stock Appreciation Rights will remain exercisable after a Participant’s Separation
from Service on the same basis as Stock Options would be exercisable after a Participant’s Separation from Service in accordance with Section 6.4(f). 

(g)    No Stock Appreciation Rights will be Transferable by the Participant other than by will or by the
laws of descent and distribution, and all such rights will be exercisable, during the Participant’s lifetime, only by the Participant. 

Section 7.2    Automatic Exercise. The Committee may include a term or condition in an Award Agreement
providing for the automatic exercise of a Stock Appreciation Right on a cashless basis on the last day of the term of the Stock Appreciation Right if the Participant has failed to exercise the Stock Appreciation Right as of such date, with respect
to which the Fair Market Value of the Shares underlying the Stock Appreciation Right exceeds the exercise price of such Stock Appreciation Right on the date of expiration of such Stock Appreciation Right, subject to
Section 13.5. 

 ARTICLE VIII 

RESTRICTED SHARES 

Section 8.1    Restricted Shares. The Committee will determine the Eligible Individuals to whom, and the time
or times at which, grants of Restricted Shares will be made, the number of Restricted Shares to be awarded, the price (if any) to be paid by the Participant (subject to Section 8.2), the time or times within which such
Awards will be subject to forfeiture, the vesting schedule and rights to acceleration thereof, and all other terms and conditions of the Awards. 

Section 8.2    Awards and Certificates. Participants selected to receive Restricted Shares will not have any
right with respect to the Award, unless and until the Participant has delivered a fully executed copy of the agreement evidencing the Award to the Company, to the extent required by the Committee, and has otherwise complied with the applicable terms
and conditions of the Award. Further, such Award will be subject to the following: 
 (a)    The purchase
price of Restricted Shares will be fixed by the Committee. Subject to Section 4.3, the purchase price for Restricted Shares may be zero to the extent permitted by Applicable Law, and, to the extent required by Applicable
Law, such purchase price may not be less than par value. 
 (b)    Each Participant receiving Restricted
Shares will be issued a stock certificate in respect of the Restricted Shares, unless the Committee elects to use another system, such as book entries by the transfer agent, as evidencing ownership of Restricted Shares. Such certificate will be
registered in the name of the Participant, and will, in addition to any legends required by Applicable Law, bear an appropriate legend referring to the terms and conditions applicable to the Award, substantially in the following form: 

“The anticipation, alienation, attachment, sale, transfer, assignment, pledge, encumbrance, or charge of the restricted shares of stock
represented hereby are subject to the terms and conditions (including forfeiture) of the Integral Ad Science Holding Corp. (the “Company”) 2021 Omnibus Incentive Plan (the “Plan”) and an award agreement entered
into between the registered owner and the Company dated                  (the “Agreement”). Copies of such Plan and Agreement are on file at the
principal office of the Company.” 
 (c)    If stock certificates are issued in respect of
Restricted Shares, the Committee may require that any stock certificates evidencing such Shares be held in custody by the Company until the restrictions thereon have lapsed, and that, as a condition of any grant of Restricted Shares, the Participant
must deliver a duly signed stock power or other instruments of assignment, each endorsed in blank with a guarantee of signature if deemed necessary or appropriate by the Company, which would permit transfer to the Company of all or a portion of the
Restricted Shares in the event that such Award is forfeited in whole or part. 

 Section 8.3    Terms and Conditions. Restricted Shares will
be subject to terms and conditions, not inconsistent with the Plan, determined by the Committee, and the following: 

(a)    The Participant is not permitted to Transfer Restricted Shares during the period or periods set by
the Committee (the “Restriction Period”) commencing on the date of such Award, as set forth in the applicable Award Agreement, and such agreement will set forth a vesting schedule and any event that would accelerate vesting of the
Restricted Shares. Within these limits, based on service, attainment of Performance Goals, or such other factors or criteria as the Committee may determine, the Committee may condition the grant or provide for the lapse of such restrictions in
installments in whole or in part, or may accelerate the vesting of all or any part of any Restricted Shares and waive the deferral terms and conditions for all or any part of any Restricted Shares. 

(b)    Except as provided in Section 8.3(a) and this
Section 8.3(b) or as otherwise determined by the Committee, the Participant will have, with respect to Restricted Shares, all of the rights of a Stockholder, including the right to receive dividends, the right to vote such
Restricted Shares, and, subject to and conditioned upon the full vesting of Restricted Shares, the right to tender those Shares. The Committee may determine at the time of grant that the payment of dividends will be deferred until, and conditioned
upon, the expiration of the applicable Restriction Period. 
 (c)    Unless otherwise determined by the
Committee at the time of grant or, if no rights of the Participant are reduced, thereafter, subject to the applicable Award Agreement and the Plan, upon a Participant’s Separation from Service for any reason during the relevant Restriction
Period, all Restricted Shares will be forfeited. 
 (d)    If and when the Restriction Period expires
without a prior forfeiture of the Restricted Shares, the certificates for such Shares will be delivered to the Participant. All legends will be removed from said certificates at the time of delivery to the Participant, except as otherwise required
by Applicable Law or other terms and conditions imposed by the Committee. 
 ARTICLE IX 

PERFORMANCE AWARDS 

Section 9.1    Performance Awards. The Committee may grant a Performance Award to a Participant payable upon
the attainment of specific Performance Goals. If the Performance Award is payable in Restricted Shares, such Shares will be transferable to the Participant only upon attainment of the relevant Performance Goal in accordance with
Article VIII. If the Performance Award is payable in cash, it may be paid upon the attainment of the relevant Performance Goals either in cash or in Restricted Shares (based on the then current Fair Market Value of such
Shares). Each Performance Award will be evidenced by an Award Agreement in such form that is not inconsistent with the Plan and that the Committee may approve. The Committee will condition the right to payment of any Performance Award upon the
attainment of Performance Goals established under Section 9.2(c). 

 Section 9.2    Terms and Conditions. Performance Awards will
be subject to terms and conditions, not inconsistent with the Plan, determined by the Committee, and the following: 

(a)    At the expiration of the applicable Performance Period, the Committee will determine the extent to
which the Performance Goals established under Section 9.2(c) are achieved and the percentage of each Performance Award that has been earned. 

(b)    Subject to the applicable Award Agreement and the Plan, Performance Awards may not be Transferred.

 (c)    The Committee will establish the Performance Goals for the earning of Performance Awards based
on a Performance Period applicable to each Participant or class of Participants. Such Performance Goals may incorporate terms and conditions for disregarding (or adjusting for) changes in accounting methods, corporate transactions, and other similar
type events or circumstances. 
 (d)    Unless otherwise determined by the Committee at the time of
grant, amounts equal to dividends declared during the Performance Period with respect to the number of Shares covered by a Performance Award will not be paid to the Participant. 

(e)    After the Committee’s determination in accordance with
Section 9.2(a), the Company will settle Performance Awards, in such form as determined by the Committee, in an amount equal to such Participant’s earned Performance Awards. Notwithstanding the foregoing sentence, the
Committee may award an amount less than the earned Performance Awards and subject the payment of all or part of any Performance Award to additional vesting, forfeiture, and deferral terms and conditions. 

(f)    Subject to the applicable Award Agreement and the Plan, upon a Participant’s Separation from
Service for any reason during the Performance Period for a Performance Award, the Performance Award will vest or be forfeited in accordance with the terms and conditions established by the Committee at grant. 

(g)    Based on service, performance, and any other factors or criteria the Committee may determine, the
Committee may, at or after grant, accelerate the vesting of all or any part of any Performance Award. 
 ARTICLE X 

OTHER SHARE-BASED AND CASH-BASED AWARDS 

Section 10.1    Other Share-Based Awards. The Committee is authorized to grant to Eligible Individuals Other
Share-Based Awards that are payable in, valued in whole or in part by reference to, or otherwise based on or related to Shares, including Shares awarded purely as a bonus and not subject to terms or conditions, Shares in payment of the amounts due
under an incentive or performance plan sponsored or maintained by the Company or an Affiliate, stock equivalent units, restricted stock units (“RSUs”), and Awards valued by reference to book value of Shares. Other Share-Based Awards
may be granted either alone or in addition to or in tandem with other Awards. Subject to the terms and conditions of the Plan, the Committee has the authority to determine the Eligible Individuals to whom, and the time or times at which, Other
Share-Based Awards will be granted, the number of Shares to be granted under such Awards, and all other terms and conditions of the Awards. 

 Section 10.2    Terms and Conditions. Other Share-Based
Awards will be subject to terms and conditions, not inconsistent with the Plan, determined by the Committee, and the following: 

(a)    Subject to the applicable Award Agreement and the Plan, Shares subject to Other Share-Based Awards
may not be Transferred before the date on which the Shares are issued, or, if later, the date on which any applicable restriction, performance, or deferral period lapses. 

(b)    Unless otherwise determined by the Committee at the time of grant, subject to the applicable Award
Agreement and the Plan, the recipient of an Other Share-Based Award will not be entitled to receive, currently or on a deferred basis, dividends or dividend equivalents in respect of the number of Shares covered by the Award. 

(c)    All Other Share-Based Awards and any Shares covered by those awards will vest or be forfeited to the
extent so provided in the Award Agreement. 
 (d)    Common Stock issued on a bonus basis under this
Article IX may be issued for no cash consideration. Common Stock purchased under a purchase right awarded under this Article X will be priced as determined by the Committee. 

Section 10.3    Other Cash-Based Awards. The Committee may grant Other Cash-Based Awards to Eligible
Individuals in amounts, on terms and conditions, and for consideration, including no consideration or such minimum consideration as may be required by Applicable Law. Other Cash-Based Awards may be granted subject to the satisfaction of vesting
terms and conditions or may be awarded purely as a bonus and not subject to terms and conditions, and if subject to vesting, the Committee may accelerate such vesting at any time. 

ARTICLE XI 
 CHANGE
IN CONTROL 
 Section 11.1    Treatment of Awards upon a Change in Control. In the event of a Change in
Control, and except as otherwise determined by the Committee in an Award Agreement, a Participant’s unvested Awards will not vest automatically and will be treated in accordance with one or more of the following methods as determined by the
Committee: 
 (a)    Awards, whether or not then vested, will be continued, assumed, or have new rights
substituted therefor, on an economic equivalent basis, as determined by the Committee, and restrictions to which Restricted Shares or any other Award granted before the Change in Control are subject will not lapse upon the Change in Control and the
Restricted Shares or other Awards will receive the same distribution as other Common Stock on terms and conditions determined by the Committee; provided that the Committee may decide to award additional Restricted Shares or other Awards in
lieu of any cash distribution. 

 (b)    The Committee may provide for the purchase of any
Awards by the Company or an Affiliate for an amount of cash equal to the excess (if any) of the Fair Market Value of the Shares covered by such Awards as of the Change in Control, over the aggregate purchase or exercise price of such Awards. For the
purposes of this Section 11.1(b), to the extent applicable, Fair Market Value will be determined based on the highest price per Share paid in connection with any Change in Control. 

(c)    The Committee may terminate all outstanding and unexercised Stock Options, Stock Appreciation
Rights, and Other Share-Based Awards that provide for a Participant-elected exercise, effective as of the Change in Control, by delivering notice of termination to each Participant at least 20 days before the date of consummation of the Change
in Control, in which case during the period from the date on which such notice of termination is delivered to the consummation of the Change in Control, each affected Participant will have the right to exercise in full all of the Participant’s
Awards that are then outstanding (without regard to any terms and conditions on exercisability otherwise contained in the Award Agreements), but any such exercise will be contingent on the occurrence of the Change in Control; provided that,
if the Change in Control does not take place within a specified period after giving such notice for any reason whatsoever, the notice and exercise pursuant thereto will be null and void. 

(d)    The Committee may make any other determination as to the treatment of Awards in connection with a
Change in Control. The treatment of Awards need not be the same for all Participants. Any escrow, holdback, earnout, or similar terms and conditions in the definitive agreements relating to the Change in Control may apply to any payment to the
holders of Awards to the same extent and in the same manner as such terms and conditions apply to the holders of Shares. 

Section 11.2    Change in Control. Unless otherwise determined by the Committee in the applicable Award
Agreement or other written agreement with a Participant approved by the Committee, a “Change in Control” means: 

(a)    any “person,” as that term is used in Sections 13(d) and 14(d) of
the Exchange Act (other than the Company, any trustee or other fiduciary holding securities under any employee benefit plan of the Company, or any company owned, directly or indirectly, by the Stockholders in substantially the same proportions as
their ownership of Common Stock), becomes the beneficial owner (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of securities of the Company representing more than 50% of the
combined voting power of the Company’s then outstanding securities, other than pursuant to a Business Combination that does not constitute a Change in Control under such Section 11.2(c); 

(b)    during any period of 24 consecutive calendar months, individuals who were directors serving on the
Board on the first day of such period (the “Incumbent Directors”) cease for any reason to constitute a majority of the Board; provided, however, that any individual becoming a director after the first day of such
period whose election, or nomination for election, by the Stockholders was approved by a vote of at least a majority of the Incumbent Directors will be considered as though such individual were an Incumbent

 
Director, but excluding, for purposes of this proviso, any such individual whose initial assumption of office occurs as a result of an actual or threatened proxy contest with respect to election
or removal of directors or other actual or threatened solicitation of proxies or consents by or on behalf of a “person” (as used in Section 13(d) of the Exchange Act), in each case, other than the Board; 

(c)    consummation of a reorganization, merger, consolidation, or other business combination (any of the
foregoing, a “Business Combination”) of the Company or any direct or indirect subsidiary of the Company with any other corporation, in any case with respect to which the Company voting securities outstanding immediately before such
Business Combination do not, immediately after such Business Combination, continue to represent (either by remaining outstanding or being converted into voting securities of the Company or any ultimate parent thereof) more than 50% of the then
outstanding voting securities entitled to vote generally in the election of directors of the Company (or its successor) or any ultimate parent thereof after the Business Combination; or 

(d)    a complete liquidation or dissolution of the Company or the consummation of a sale or disposition by
the Company of all or substantially all of the Company’s assets other than the sale or disposition of all or substantially all of the assets of the Company to a Person or Persons who beneficially own, directly or indirectly, more than 50% of
the combined voting power of the outstanding voting securities of the Company at the time of the sale. 
 For purposes of this Section 11.2,
acquisitions or sales of securities of the Company by Vista, any of its respective affiliates, or any investment vehicle or fund controlled by or managed by, or otherwise affiliated with Vista shall not constitute a Change in Control.
Notwithstanding the foregoing terms and conditions of this definition, if a Change in Control constitutes a payment event with respect to any Award (or any portion of an Award) that provides for the deferral of compensation that is subject to
Section 409A of the Code, a Change in Control will not be deemed to have occurred for purposes of such Award (or portion thereof) unless such transaction or series of related transactions also constitutes a “change in control event”
with respect to the Company for purposes of Section 409A of the Code. 
 Section 11.3    Initial Public
Offering not a Change in Control. Notwithstanding the foregoing terms and conditions of the definition of Change in Control, the occurrence of the Registration Date will not be considered a Change in Control. 

ARTICLE XII 

AMENDMENT AND TERMINATION 

Section 12.1    Amendment and Termination of Plan. Subject to Section 12.3, the
Board may amend or terminate the Plan at any time; provided, however, that no amendment will be effective unless approved by the Stockholders to the extent Stockholder approval is necessary to satisfy any Applicable Laws. 

Section 12.2    Amendment of Awards. Subject to Section 12.3, the Committee may
amend any Award at any time; provided, however, that no amendment will be effective unless approved by the Stockholders to the extent Stockholder approval is necessary to satisfy any Applicable Laws. 

 Section 12.3    No Material Impairment of Rights. Rights
under any Award granted before amendment or termination of the Plan or amendment of an Award may not be materially impaired by any such amendment or termination unless the Participant consents thereto. 

ARTICLE XIII 

GENERAL TERMS AND CONDITIONS 

Section 13.1    Legend. The Committee may require each person receiving Shares under the Plan to represent to
and agree with the Company in writing that the Participant is acquiring the Shares without a view to distribution thereof. In addition to any legend required by the Plan, the certificates for Shares issued under the Plan may include any legend that
the Committee deems appropriate to reflect any restrictions on Transfer. All certificates for Shares delivered under the Plan will be subject to such stop-transfer orders and other restrictions as the Committee may deem advisable under Applicable
Law, and the Committee may cause a legend or legends to be put on any such certificates to make appropriate reference to such restrictions. 

Section 13.2    Book Entry. Notwithstanding any other term or condition of the Plan, the Company may elect to
satisfy any requirement under the Plan for the delivery of Share certificates through the use of another system, such as book entry or electronically. 

Section 13.3    Other Plans. Nothing contained in the Plan prevents the Board from adopting other or
additional compensation arrangements, subject to Stockholder approval if such approval is required, and such arrangements may be either generally applicable or applicable only in specific cases. 

Section 13.4    No Right to Employment, Consultancy, or Directorship. Neither the Plan nor the grant of any
Award gives any Person any right with respect to continuance of employment, consultancy, or directorship by the Company or any Affiliate, nor does the Plan or the grant of any Award cause any limitation in any way on the right of the Company or any
Affiliate by which an employee is employed or a Consultant or Non-Employee Director is retained to terminate such employment, consultancy, or directorship at any time. 

Section 13.5    Withholding for Taxes. The Company or an Affiliate, as the case may be, has the right to
deduct from payments of any kind otherwise due to a Participant any U.S. federal, state, local or foreign taxes of any kind required by Applicable Law to be withheld (a) with respect to the grant, vesting of or other lapse of restrictions
applicable to an Award, (b) upon the issuance of any Shares upon the exercise of an Option or Stock Appreciation Right, or (c) otherwise due in connection with an Award. At the time the tax obligation becomes due, the Participant must pay
to the Company or the Affiliate, as the case may be, any amount that the Company or Affiliate determines to be necessary to satisfy the tax obligation. The Company or the Affiliate, as the case may be, may require or permit the Participant to
satisfy the tax obligation, in whole or in part, (i) by causing the Company or Affiliate to withhold up to the maximum required number of Shares otherwise issuable to the Participant as may be necessary to satisfy such tax obligation;
(ii) by delivering to the Company or Affiliate Shares already owned by the Participant; (iii) the Company 

 
or the Affiliate withholding cash from any compensation otherwise payable to or for the benefit of the Participant, (iv) withholding from proceeds from the sale of shares of Common Stock
issued to the Participant under such Award, either through a voluntary sale or a mandatory sale arranged by the Company; or (v) any other method determined by the Committee that is permissible under Applicable Law. To the extent withholding
occurs as indicated in (i) or (ii) above, the Shares delivered or withheld must have an aggregate Fair Market Value approximately equal to the tax obligation. The Fair Market Value of the Shares used to satisfy the tax obligation will be
determined by the Company or the Affiliate as of the date that the amount of tax to be withheld is to be determined. To the extent applicable, a Participant may satisfy his or her tax obligation only with Shares that are not subject to any
repurchase, forfeiture, unfulfilled vesting, or other similar requirements. 
 Section 13.6    No Assignment of
Benefits. No Award or other benefit payable under the Plan may, except as otherwise specifically provided by Applicable Law or permitted by the Committee, be Transferable in any manner, and any attempt to Transfer any such benefit will be void,
and any such benefit will not in any manner be liable for or subject to the debts, contracts, liabilities, engagements, or torts of any Person who will be entitled to such benefit, nor will it be subject to attachment or legal process for or against
such Person. 
 Section 13.7    Listing and Other Terms and Conditions. 

(a)    Unless otherwise determined by the Committee, as long as the Common Stock is listed on a national
stock exchange or system sponsored by a national securities association, the issuance of Shares under an Award will be conditioned upon such Shares being listed on such exchange or system. The Company will have no obligation to issue such Shares
unless and until such Shares are so listed, and the right to exercise any Stock Option or other Award with respect to such Shares will be suspended until such listing has been effected. 

(b)    If at any time counsel to the Company is of the opinion that any sale or delivery of Shares under an
Award is or may be unlawful or result in the imposition of excise taxes on the Company, the Company will have no obligation to make such sale or delivery, or to make any application or to effect or to maintain any qualification or registration under
the Securities Act or otherwise, with respect to Shares or Awards, and the right to exercise any Stock Option or other Award will be suspended until, in the opinion of said counsel, such sale or delivery would be lawful or would not result in the
imposition of excise taxes on the Company. 
 (c)    Upon termination of any period of suspension under
this Section 13.7, any Award affected by such suspension that has not expired or terminated will be reinstated as to all Shares available before such suspension and as to Shares that would otherwise have become available
during the period of such suspension, but no such suspension will extend the term of any Award. 

(d)    A Participant will be required to supply the Company with certificates, representations, and
information that the Company requests and otherwise cooperate with the Company in obtaining any listing, registration, qualification, exemption, consent, and approval the Company reasonably determines necessary or appropriate. 

 Section 13.8    Stockholders Agreement and Other
Requirements. Notwithstanding any other term or condition of the Plan, as a condition to the receipt of Shares under an Award, to the extent required by the Committee, the Participant must execute and deliver a Stockholder’s agreement and
such other documentation that sets forth certain restrictions on transferability of the Shares acquired upon exercise or purchase, and such other terms and conditions as the Committee may establish. The Company may require, as a condition of
exercise, the Participant to become a party to an existing Stockholders agreement (or other agreement). Any payment of cash or issuance or transfer of Shares or other property to the Participant or the Participant’s legal representative under
the Plan will, to the extent thereof, be in full satisfaction of all claims of such Persons under the plan, and the Company may require the Participant or the Participant’s legal representative, as a condition to such payment or issuance or
transfer, to execute a general release of all claims in favor of the Company and each Affiliate in such form as the Company may determine. 

Section 13.9    Governing Law. The Plan and actions taken in connection with the Plan will be governed and
construed in accordance with the laws of the U.S. State of Delaware without regard to the principles of conflicts of laws (whether of the U.S. State of Delaware or any other jurisdiction). 

Section 13.10    Jurisdiction; Waiver of Jury Trial. Any suit, action, or proceeding with respect to the Plan
or any Award or Award Agreement, or any judgment entered by any court of competent jurisdiction in respect of the Plan or any Award or Award Agreement, will be resolved only in the courts of the U.S. State of Delaware or the United States District
Court for the District of Delaware and the appellate courts having jurisdiction of appeals in such courts. In that context, and without limiting the generality of the foregoing, each of the Company and each Participant irrevocably and
unconditionally (a) submits in any proceeding relating to the Plan or any Award or Award Agreement, or for the recognition and enforcement of any judgment in respect of the Plan or any Award or Award Agreement (a “Proceeding”),
to the exclusive jurisdiction of the courts of the U.S. State of Delaware or the United States District Court for the District of Delaware and the appellate courts having jurisdiction of appeals in such courts, and agrees that all claims in respect
of any Proceeding will be heard and determined in such state court or, to the extent permitted by Applicable Law, in such federal court, (b) consents that any Proceeding may and will be brought in such courts and waives any objection that the
Company or the Participant may have at any time after the Effective Date to the venue or jurisdiction of any Proceeding in any such court or that the Proceeding was brought in an inconvenient court and agrees not to plead or claim the same,
(c) waives all right to trial by jury in any Proceeding (whether based on contract, tort, or otherwise) arising out of or relating to the Plan or any Award or Award Agreement, (d) agrees that service of process in any Proceeding may be
effected by mailing a copy of such process by registered or certified mail (or any substantially similar form of mail), postage prepaid, to such party, in the case of a Participant, at the Participant’s address shown in the books and records of
the Company or, in the case of the Company, at the Company’s principal offices, attention General Counsel, and (e) agrees that nothing in the Plan will affect the right to effect service of process in any other manner permitted by the laws
of the State of Delaware. 

 Section 13.11    Other Benefits. No Award will be considered
compensation for purposes of computing benefits under any retirement plan of the Company or any Affiliate or affect any benefit under any other benefit plan now or subsequently in effect under which the availability or amount of benefits is related
to the level of compensation. 
 Section 13.12    Costs. The Company will bear all expenses associated with
administering the Plan, including expenses of issuing Common Stock under Awards. 
 Section 13.13    No Right to
Same Benefits. The terms and conditions of Awards need not be the same with respect to each Participant, and Awards to individual Participants need not be the same in subsequent years (if granted at all). 

Section 13.14    Death; Disability. The Committee may require the transferee of a Participant to supply it
with written notice of the Participant’s death or Disability and to supply it with a copy of the will (in the case of the Participant’s death) or such other evidence as the Committee deems necessary to establish the validity of the
transfer of an Award. The Committee may also require the agreement of the transferee to be bound by the Plan. 

Section 13.15    Section 16(b) of the Exchange Act. All elections and transactions under
the Plan by Persons subject to Section 16 of the Exchange Act involving Shares are intended to comply with any applicable exemptive condition under Rule 16b-3. The Committee may establish and adopt
written administrative guidelines, designed to facilitate compliance with Section 16(b) of the Exchange Act, as it may deem necessary or proper for the administration and operation of the Plan and the transaction of business thereunder. 

Section 13.16    Section 409A. The Plan is intended to comply with Section 409A and
will be limited, construed, and interpreted in accordance with such intent. To the extent that any Award is subject to Section 409A, it will be paid in a manner that complies with Section 409A. Notwithstanding any other provision of the
Plan, any Plan provision that is inconsistent with Section 409A will be deemed to be amended to comply with Section 409A and to the extent such provision cannot be amended to comply, such provision will be null and void. The Company will
have no liability to a Participant, or any other party, if an Award that is intended to be exempt from or compliant with Section 409A is not so exempt or compliant, or for any action taken by the Committee or the Company and, in the event that
any amount or benefit under the Plan becomes subject to penalties under Section 409A, responsibility for payment of such penalties will rest solely with the affected Participants and not with the Company. Notwithstanding any other provision in
the Plan or any Award Agreement, any payment(s) of “nonqualified deferred compensation” (within the meaning of Section 409A) that are otherwise required to be made under the Plan to a “specified employee” (as defined under
Section 409A) as a result of such employee’s separation from service (other than a payment that is not subject to Section 409A) will be delayed for the first six months after such separation from service and will instead be paid (in a
manner set forth in the Award Agreement) upon expiration of such delay period (or, if earlier, the date of death of the specified employee). All installment payments under the Plan will be deemed separate payments for purposes of Section 409A.

 Section 13.17    California Participants. The Plan is intended to comply with Section 25102(o) of
the California Corporations Code, to the extent applicable. In that regard, to 

 
the extent required by Section 25102(o), (a) the terms and conditions of any Options and Stock Appreciation Rights, to the extent vested and exercisable upon a Participant’s
Separation from Service, will include any minimum exercise periods after Separation from Service required by Section 25102(o) and (b) any repurchase right of the Company or any Affiliate will include a minimum 90-day notice requirement. Any Plan term that is inconsistent with Section 25102(o) will, without further act or amendment by the Company or the Board, be reformed to comply with the requirements of
Section 25102(o). 
 Section 13.18    Successor and Assigns. The Plan will be binding on all successors
and permitted assigns of a Participant, including the estate of such Participant and the executor, administrator, or trustee of such estate. 

Section 13.19    Severability of Terms and Conditions. If any term or condition of the Plan is held invalid or
unenforceable, such invalidity or unenforceability will not affect any other term or condition of the Plan, and the Plan will be construed and enforced as if such term or condition had not been included. 

Section 13.20    Payments to Minors, Etc. Any benefit payable to or for the benefit of a minor, an incompetent
Person, or other Person incapable of receipt thereof will be considered paid when paid to such Person’s guardian or to the party providing or reasonably appearing to provide for the care of such Person, and such payment will fully discharge the
obligations of the Committee, the Board, the Company, all Affiliates, and their employees, agents, and representatives with respect thereto. 

Section 13.21    Lock-Up Agreement. As a condition to the grant of an
Award, if requested by the Company and the lead underwriter of any public offering of Common Stock (the “Lead Underwriter”), a Participant must irrevocably agree not to sell, contract to sell, grant any option to purchase, transfer
the economic risk of ownership in, make any short sale of, pledge or otherwise transfer or dispose of, any interest in any Common Stock or any securities convertible into, derivative of, or exchangeable or exercisable for, or any other rights to
purchase or acquire Common Stock (except Common Stock included in such public offering or acquired on the public market after such offering) during such period of time after the effective date of a registration statement of the Company filed under
the Securities Act that the Lead Underwriter may specify (the “Lock-Up Period”). Each Participant must sign such documents as may be requested by the Lead Underwriter to effect the foregoing.
The Company may impose stop-transfer instructions with respect to Common Stock acquired under an Award until the end of such Lock-Up Period. 

Section 13.22    Separation from Service for Cause; Clawbacks; Detrimental Conduct. 

(a)    The Company may cancel any unvested Awards if the Participant incurs a Separation from Service for
Cause. 
 (b)    All awards, amounts, or benefits received or outstanding under the Plan will be subject
to clawback, cancellation, recoupment, rescission, payback, reduction, or other similar action in accordance with any Company clawback or similar policy or any Applicable Law related to such actions. A Participant’s acceptance of an Award will
constitute the Participant’s acknowledgement of and consent to the Company’s application, 

 
implementation, and enforcement of any applicable Company clawback or similar policy that may apply to the Participant, whether adopted before or after the Effective Date, and any Applicable Law
relating to clawback, cancellation, recoupment, rescission, payback, or reduction of compensation, and the Participant’s agreement that the Company may take any actions that may be necessary to effectuate any such policy or Applicable Law,
without further consideration or action. 
 (c)    Except as otherwise determined by the Committee,
notwithstanding any other term or condition of the Plan, if a Participant engages in Detrimental Conduct, whether during the Participant’s service or after the Participant’s Separation from Service, in addition to any other penalties or
restrictions that may apply under the Plan, Applicable Law, or otherwise, the Participant must forfeit or pay to the Company the following: 

(i)    any and all outstanding Awards granted to the Participant, including Awards that have become vested
or exercisable; 
 (ii)    any cash or Shares received by the Participant in connection with the Plan
within the 36-month period immediately before the date the Participant engaged in Detrimental Conduct; and 

(iii)    the profit realized by the Participant from the sale, or other disposition for consideration, of
any Shares received by the Participant under the Plan within the 36-month period immediately before the date the Participant engaged in Detrimental Conduct. 

Section 13.23    Data Protection. A Participant’s acceptance of an Award will be deemed to constitute the
Participant’s acknowledgement of and, where required, consent to the collection and processing of personal data relating to the Participant so that the Company and the Affiliates can fulfill their obligations and exercise their rights under the
Plan and generally administer and manage the Plan. This data will include data about participation in the Plan and Shares offered or received, purchased, or sold under the Plan and other appropriate financial and other data (such as the date on
which the Awards were granted) about the Participant and the Participant’s participation in the Plan. 

Section 13.24    Unfunded Plan. The Plan is intended to constitute an “unfunded” plan for incentive
and deferred compensation. With respect to any payment as to which a Participant has a fixed and vested interest but that is not yet made to a Participant by the Company, nothing in the Plan gives any Participant any right that is greater than the
rights of a general unsecured creditor of the Company. The grant of an Award will not require a segregation of any of the Company’s assets for satisfaction of the Company’s payment obligation under any Award. 

Section 13.25    Plan Construction. In the Plan, unless otherwise stated, the following uses apply: 

(a)    references to an Applicable Law refer to such Applicable Law and any amendments and supplements
thereto and any successor Applicable Law, and to all valid and binding rules and regulations promulgated thereunder, court decisions, and other regulatory and judicial authority issued or rendered thereunder, as amended or supplemented, or their
successors, as in effect at the relevant time; 

 (b)    in computing periods from a specified date to a
later specified date, the words “from” and “commencing on” (and the like) mean “from and including,” and the words “to,” “until,” and “ending on” (and the like) mean “to and
including”; 
 (c)    indications of time of day will be based upon the time applicable to the
location of the principal headquarters of the Company; 
 (d)    the words “include,”
“includes,” and “including” (and the like) mean “include, without limitation,” “includes, without limitation,” and “including, without limitation” (and the like), respectively; 

(e)    all references to articles, sections, and exhibits are to articles, sections, and exhibits in or to
the Plan; 
 (f)    all words used will be construed to be of such gender or number as the circumstances
and context require; 
 (g)    the captions and headings of articles, sections, and exhibits have been
inserted solely for convenience of reference and will not be considered a part of the Plan, nor will any of them affect the meaning or interpretation of the Plan; 

(h)    any reference to an agreement, plan, policy, form, document, or set of documents, and the rights and
obligations of the parties under any such agreement, plan, policy, form, document, or set of documents, will mean the agreement, plan, policy, form, document, or set of documents as amended from time to time, and any and all modifications,
extensions, renewals, substitutions, or replacements thereof; and 
 (i)    all accounting terms not
specifically defined will be construed in accordance with GAAP. 

*            *           
 *            *Exhibit 10.1

 

Execution Version

 

VOTING AND SUPPORT AGREEMENT

 

This VOTING
AND Support Agreement, dated as of August 11, 2021 (this “Agreement”),
is made and entered into by and among Desktop Metal, Inc., a Delaware corporation (“Parent”),
Texas Merger Sub I, Inc., a Delaware corporation and a direct, wholly owned subsidiary of Parent (“Merger Sub I”),
Texas Merger Sub II, LLC, a Delaware limited liability company and a direct, wholly owned subsidiary of Parent (“Merger Sub II”),
and the undersigned stockholder of the Company (as defined below) (the “Stockholder”
and, together with Parent, Merger Sub I and Merger Sub II, the “Parties”).

 

RECITALS

 

WHEREAS, concurrently with
the execution and delivery of this Agreement, Parent, Merger Sub I, Merger Sub II and The ExOne Company, a Delaware corporation (the “Company”),
are entering into an Agreement and Plan of Merger, dated as of the date hereof (as amended, supplemented or otherwise modified from time
to time, the “Merger Agreement”);

 

WHEREAS, as of the date hereof,
the Stockholder Beneficially Owns and owns of record the shares of common stock, par value $0.01 per share, of the Company (the “Existing
Shares”), as set forth on Exhibit A attached hereto; and

 

WHEREAS, as a material condition
and inducement to Parent, Merger Sub I and Merger Sub II’s willingness to enter into the Merger Agreement, the Stockholder has agreed
to enter into this Agreement.

 

NOW, THEREFORE, in consideration
of the foregoing and the representations, warranties, covenants and agreements contained herein, and for other good and valuable consideration,
the sufficiency of which is hereby acknowledged, intending to be legally bound hereby, the Parties agree as follows:

 

Article
I

DEFINITIONS and interpretations

 

Section 1.1            Defined
Terms. As used in this Agreement, the following terms have the following meanings:

 

“Beneficially Own”
means, with regard to any securities, having “beneficial ownership”
of such securities for purposes of Rule 13d-3 or 13d-5 under the Exchange Act. Similar terms such as “Beneficial Ownership”
and “Beneficial Owner” have the corresponding meanings.

 

“Covered Company
Shares” means, with respect to the Stockholder, (a) any Existing Shares Beneficially Owned or owned of record by the Stockholder
and (b) any Company securities of which the Stockholder has Beneficial Ownership or record ownership after the date hereof.

 

     

     

    

 

“Transfer”
means any sale, assignment, transfer, conveyance, gift, pledge, distribution, hypothecation or other encumbrance or any other disposition,
whether voluntary, involuntary or by operation of law, whether effected directly or indirectly, or the entry into any contract or understanding
with respect to any sale, assignment, transfer, conveyance, gift, pledge, distribution, hypothecation or other encumbrance or any other
disposition, whether voluntary, involuntary or by operation of law, whether effected directly or indirectly, including, with respect to
any capital stock or interests in capital stock, the entry into any swap or any contract, transaction or series of transactions that hedges
or transfers, in whole or in part, directly or indirectly, the economic consequence of ownership of such capital stock or interest in
capital stock, whether any such swap, contract, transaction or series of transactions is to be settled by delivery of Company securities,
in cash or otherwise.

 

Section 1.2            Interpretations.

 

(a)           Each
capitalized term used but not defined in this Agreement has the meaning given to it in the Merger Agreement.

 

(b)          Where
a reference in this Agreement is made to a Section or Exhibit such reference will be to a Section of or Exhibit to this Agreement unless
otherwise indicated. Whenever the words “include,” “includes,” or “including” are used in this Agreement
they will be deemed to be followed by the words “without limitation.” The words “hereof,” “herein,”
and “hereunder” and words of similar import when used in this Agreement will 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. Any contract, instrument, or statute defined or referred to herein or in any contract or instrument
that is referred to herein means such contract, instrument, or statute as from time to time amended, modified, or supplemented, including,
in the case of contracts 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 permitted assigns. Where this Agreement states that a party “shall,” “will” or “must” perform
in some manner it means that the party is legally obligated to do so under this Agreement.

 

Article
II

VOTING AGREEMENT AND IRREVOCABLE PROXY

 

Section 2.1           
Agreement to Vote.

 

(a)         
The Stockholder hereby irrevocably and unconditionally agrees that, during the term of this Agreement, at the Company Stockholder
Meeting and at any other meeting of the Company’s stockholders, however called, in each case, including any adjournment or postponement
thereof, and in connection with any written consent of the Company’s stockholders, the Stockholder shall, in each case to the fullest
extent that the Covered Company Shares are entitled to vote thereon or consent thereto, or in any other circumstance in which the vote,
consent or other approval of the Company’s stockholders is sought, including the Company Stockholder Approval:

 

(i)     
appear at each such meeting or otherwise cause the Stockholder’s Covered Company Shares to be counted as present thereat
for purposes of calculating a quorum; and

 

    2

     

    

 

(ii)     
vote (or cause to be voted), in person or by proxy, or if applicable deliver (or cause to be delivered) a written consent covering,
all of the Stockholder’s Covered Company Shares:

 

(1)        
in favor of the approval of the adoption of the Merger Agreement and the Mergers and any other action requested by Parent in furtherance
thereof;

 

(2)        
in favor of any proposal to adjourn a meeting of the Company’s stockholders to solicit additional proxies in favor of the
adoption of the Merger Agreement;

 

(3)        
against any Company Acquisition Proposal; and

 

(4)        
against any other proposal, action or transaction that is intended to, or could reasonably be expected to, impede, interfere with,
delay, postpone, discourage, frustrate the purposes of or adversely affect the consummation of the Mergers or the performance by the Company
of its obligations under the Merger Agreement or this Agreement, including (x) against any proposal, action or transaction that could
reasonably be expected to result in any condition to the consummation of the Mergers set forth in Article VI of the Merger Agreement not
being satisfied, or that could reasonably be expected to result in a breach in any material respect of any representation, warranty, covenant
or agreement of the Company pursuant to the Merger Agreement or this Agreement and (y) any amendments to the Company Charter or Company
Bylaws if such amendment would reasonably be expected to prevent or delay the consummation of the Closing.

 

The Stockholder shall not, at
any time prior to the Termination Date, (i) enter into any voting agreement or voting trust with respect to any of the Stockholder’s
Covered Company Shares that is inconsistent with the Stockholder’s obligations pursuant to this Agreement, or (ii) enter into
any agreement or undertaking that is otherwise inconsistent with, or would interfere with, or prohibit or prevent it from satisfying,
its obligations pursuant to this Agreement.

 

(b)         
Any vote required to be cast or consent required to be executed pursuant to this Section 2.1 shall be cast or executed in
accordance with the applicable procedures relating thereto so as to ensure that it is duly counted for purposes of determining whether
a quorum is present (if applicable) and for purposes of recording the results of the vote or consent.

 

Article
III

OTHER COVENANTS

 

Section 3.1           
Support. The Stockholder shall use its reasonable best efforts to provide assistance to Parent, Merger Sub I, Merger Sub
II and the Company in connection with the Merger Agreement, including by supplying and providing complete and accurate information regarding
the Stockholder to, and as reasonably requested by, Parent, Merger Sub I, Merger Sub II, the Company or any Governmental Entity or other
Person in connection with the making of any filings to or with, or obtaining any consent of, any Governmental Entity with respect to the
Merger Agreement or the Mergers.

 

    3

     

    

 

Section 3.2           
Stock Dividends, Distributions, Etc. In the event of a stock split, reverse stock split, stock dividend or distribution,
or any change in the Company Common Stock by reason of any recapitalization, combination, reclassification, exchange of shares or similar
transaction, the terms “Existing Shares” and “Covered Company Shares” shall be deemed to refer to and include
all such stock dividends and distributions and any Company securities into which or for which any or all of such shares may be changed
or exchanged or which are received in such transaction.

 

Section 3.3           
Lock-Up. The Stockholder hereby covenants and agrees that between the date hereof and the termination of this Agreement
in accordance with its terms, the Stockholder will not (a) Transfer any Covered Company Shares or (b) take any action that would make
any of its representations or warranties contained herein untrue or incorrect or have the effect of preventing or materially impeding
the Stockholder from performing its obligations under this Agreement. Notwithstanding the foregoing, in connection with any Transfer not
involving or relating to any Company Acquisition Proposal, the Stockholder may (i) Transfer any or all of its Covered Company Shares (A)
to any Affiliate of the Stockholder (B) by will or by operation of law upon the death of the Stockholder
or Transfers to immediate family members, trusts for the benefit of the Stockholder or any immediate family members for estate planning
purposes, or, (C) in connection with bona fide gifts to charitable organizations or other gift Transfers, and (ii) with respect to
the Stockholder’s Company Equity Awards that vest or are exercised on or prior to the Termination Date, Transfer Covered Company
Shares to the Company in order to satisfy any required withholding taxes applicable upon the such vesting or exercise of such Company
Equity Awards; provided, however, that in each case described in clauses (i)(A),(B) and (C) above, prior to and as
a condition to the effectiveness of such Transfer, each Person to which any of such Covered Company Shares or any interest in any of such
Covered Company Shares is Transferred shall have executed and delivered to Parent, Merger Sub I and Merger Sub II a counterpart to this
Agreement pursuant to which such Person shall be bound by all of the terms and provisions of this Agreement. If any involuntary Transfer
of any of the Covered Company Shares shall occur (including a sale by Stockholder’s trustee in any bankruptcy, or a sale to a purchaser
at any creditor’s or court sale), the transferee (which term, as used herein, shall include any and all transferees and subsequent
transferees of the initial transferee) shall take and hold such Covered Company Shares subject to all of the restrictions, liabilities
and rights under this Agreement, which shall continue in full force and effect for the Voting Period.

 

Section 3.4           
Appraisal Rights. The Stockholder irrevocably and unconditionally agrees not to exercise any rights of appraisal or any
dissenters’ rights that the Stockholder may have (whether under applicable Law or otherwise) or could potentially have or acquire
in connection with the Mergers, and the Stockholder hereby irrevocably and unconditionally waives any such rights of appraisal or rights
to dissent that the Stockholder may have under applicable Law.

 

    4

     

    

 

Section 3.5           
Disclosure. The Stockholder hereby authorizes Parent, Merger Sub I and Merger Sub II to publish and disclose in any announcement
or disclosure required by the SEC or the rules of any national securities exchange and, to the extent required by applicable Law, in the
Proxy Statement (including all documents and schedules filed with the SEC in connection therewith) and any other required filings under
the Securities Act or the Exchange Act or otherwise required by Law, its identity and ownership of the Covered Company Shares and the
nature of its commitments, arrangements and understandings under this Agreement.

 

Section 3.6           
Public Statements. Each of Parent, Merger Sub I, Merger Sub II and the Stockholder shall not, and shall not permit any of
its Subsidiaries to, or authorize or permit any affiliate, director, officer, trustee, employee or partner of such Person or any of its
Subsidiaries or any Representative of such Person or any of its Subsidiaries to, directly or indirectly, issue any press release or make
any other public statement with respect to the Merger Agreement, this Agreement, the Mergers or any of the other transactions contemplated
by the Merger Agreement or by this Agreement that is inconsistent with the transactions contemplated by this Agreement or the Merger Agreement.

 

Article
IV

REPRESENTATIONS AND WARRANTIES OF THE STOCKHOLDER

 

The Stockholder represents and
warrants to Parent, Merger Sub I and Merger Sub II as follows:

 

Section 4.1           
Authority Relative to this Agreement; No Violation.

 

(a)         
The Stockholder has full legal capacity to enter into, and to perform its covenants and agreements under, this Agreement and to
consummate the transactions contemplated hereby. This Agreement has been duly and validly executed and delivered by the Stockholder and,
assuming this Agreement constitutes the legal, valid and binding agreement of Parent, Merger Sub I and Merger Sub II, constitutes the
legal, valid and binding agreement of the Stockholder, enforceable against the Stockholder in accordance with its terms, subject to the
Enforceability Limitations.

 

(b)         
No authorization, consent, order, license, permit or approval of, or registration, declaration, notice or filing with, any Governmental
Entity is necessary, under applicable Law, for the consummation by the Stockholder of the transactions contemplated by this Agreement.

 

(c)         
The execution and delivery by the Stockholder of this Agreement do not, and the consummation of the transactions contemplated hereby
and compliance with the provisions hereof will not, (i) (A) result in any violation of, or default (with or without notice or lapse of
time, or both) under, or give rise to a right of termination, cancellation, acceleration or put right of any material obligation or to
the loss of a material benefit under any contract or agreement to which the Stockholder is a party or (B) result in the creation of any
Liens upon any of the properties or assets of the Stockholder, or (ii) conflict with or violate any applicable Law, other than, in the
case of clauses (i) and (ii), any such violation, conflict, default, termination, cancellation, acceleration, right, loss or Lien that
would not reasonably be expected to have, individually or in the aggregate, a material adverse effect on the Stockholder’s ability
to perform and comply with its covenants and agreements under this Agreement.

 

    5

     

    

 

Section 4.2           
Ownership of Shares. The Stockholder Beneficially Owns and is the record owner of the Existing Shares set forth opposite
the Stockholder’s name on Exhibit A free and clear of any Liens, and free of any other limitation or restriction (including
any limitation or restriction on the right to vote, sell, transfer or otherwise dispose of the Existing Shares) other than this Agreement
and any limitations or restrictions imposed under applicable securities Laws. The Existing Shares set forth opposite the Stockholder’s
name on Exhibit A constitute all of the Shares Beneficially Owned or owned of record by the Stockholder. The Stockholder has the
only voting power, power of disposition, power to demand appraisal rights and power to agree to all of the matters set forth in this Agreement,
in each case with respect to all of such Covered Company Shares, with no limitations, qualifications or restrictions on such rights, subject
to applicable Laws and the terms of this Agreement. As of the date hereof, the Stockholder does not Beneficially Own any shares of Parent
Common Stock. Stockholder has not entered into or agreed to enter into any option, call, put, derivative, hedging, swap, forward or other
similar arrangement in respect of Covered Company Shares, and has no agreement, arrangement or understanding with respect to any of the
foregoing.

 

Section 4.3           
Investigation; Litigation. (a) There is no investigation or review pending or, to the knowledge of the Stockholder, threatened
by any Governmental Entity, (b) there are no actions, suits, claims, charges, litigation, arbitrations or proceedings pending or, to the
knowledge of the Stockholder, threatened by or before any Governmental Entity against the Stockholder or any of its properties or assets
and (c) there are no laws, executive orders, rulings, injunctions or other orders of any Governmental Entity outstanding binding on the
Stockholder or any of its respective properties or assets, in each case, that would reasonably be expected to have, individually or in
the aggregate, a material adverse effect on the Stockholder’s ability to perform and comply with its covenants and agreements under
this Agreement.

 

Section 4.4           
Merger Agreement. The Stockholder understands and acknowledges that Parent, Merger Sub I and Merger Sub II are entering
into the Merger Agreement in reliance upon, and Parent, Merger Sub I and Merger Sub II would not enter into the Merger Agreement without,
the Stockholder’s execution and delivery of this Agreement.

 

Section 4.5           
The Stockholders Have Adequate Information. The Stockholder is a sophisticated seller with respect to the Covered Company
Shares and has adequate information concerning the business and financial condition of the Company to make an informed decision regarding
the sale of the Covered Company Shares and has independently and without reliance upon Parent, Merger Sub I or Merger Sub II and based
on such information as the Stockholder has deemed appropriate, made its own analysis and decision to enter into this Agreement.

 

    6

     

    

 

Article
V

TERMINATION

 

Section 5.1           
Termination. This Agreement shall terminate upon the earliest to occur of (a) the termination of the Merger Agreement in
accordance with its terms, (b) the delivery of written notice of termination by the Stockholder to Parent following any amendment, modification,
change or waiver to any provision of the Merger Agreement that decreases the amount or changes the form of the Merger Consideration, or
imposes any restrictions on the Stockholder’s right to receive the Merger Consideration (other than adjustments in accordance with
the terms of the Merger Agreement), in each case, without the Stockholder’s prior written consent, (c) the Effective Time and (d)
the mutual written consent of the Parties (the earliest such date under clause (a), (b), (c) and (d) being referred to herein as the “Termination
Date”). In the event of any such termination of this Agreement, the obligations of the Parties under this Agreement shall terminate
and there shall be no liability on the part of any Party with respect to this Agreement; provided, however, that (x) this
Article V and Article VI shall survive any such termination and each remain in full force and effect and (y) no Party shall
be relieved or released from any liability or damages arising from a breach of any provision of this Agreement arising prior to such termination.

 

Article
VI

MISCELLANEOUS

 

Section 6.1           
No Ownership Interest. Nothing contained in this Agreement shall be deemed to vest in Parent any direct or indirect ownership
or incidence of ownership of or with respect to any Covered Company Shares. Except as otherwise provided in this Agreement, all rights,
ownership and economic benefits of and relating to the Covered Company Shares shall remain vested in and belong to the Stockholder, and
Parent shall have no authority to direct the Stockholder in the voting or disposition of any of the Covered Company Shares.

 

Section 6.2           
Amendment; Waiver. Subject to applicable Laws, at any time prior to the Effective Time, this Agreement may be amended, modified
or waived if, and only if, such amendment, modification or waiver is in writing and signed, in the case of an amendment or modification,
by the Parties, or in the case of a waiver, by the Party against whom the waiver is to be effective.

 

Section 6.3           
Entire Agreement; Counterparts. This Agreement (including the exhibit hereto) constitutes the entire agreement, and supersedes
all other prior agreements and understandings, both written and oral, between the Parties, or any of them, with respect to the subject
matter hereof and thereof. This Agreement may be executed in any number of counterparts, each such counterpart being deemed to be an original
instrument, and all such counterparts will together constitute the same agreement. Delivery of an executed counterpart of a signature
page to this Agreement by facsimile transmission or by email of a .pdf attachment will be effective as delivery of a manually executed
counterpart of this Agreement.

 

    7

     

    

 

Section 6.4           
Governing Law; Venue; Waiver of Jury Trial; Specific Performance.

 

(a)         
This Agreement, and all claims or causes of action (whether in contract or tort) that may be based upon, arise out of or relate
to this Agreement or the Transactions, or the negotiation, execution or performance of this Agreement, shall be governed by the internal
Laws of the State of Delaware applicable to agreements made and to be performed entirely within such state, without regard to the conflicts
of law principles of such state that would cause the application of the laws of another jurisdiction.

 

(b)         
Each of the parties irrevocably agrees that any Action with respect to this Agreement and the rights and obligations arising hereunder,
or for recognition and enforcement of any Judgment in respect of this Agreement and the rights and obligations arising hereunder brought
by the other party hereto or its successors or assigns, shall be brought and determined exclusively in the Delaware Court of Chancery
and any state appellate court therefrom within the State of Delaware (or, if the Delaware Court of Chancery declines to accept jurisdiction
over a particular matter, any state or federal court within the State of Delaware). The parties further agree that no party to this Agreement
shall be required to obtain, furnish or post any bond or similar instrument in connection with or as a condition to obtaining any remedy
referred to in this Section 6.4(b), and each party waives any objection to the imposition of such relief or any right it may have
to require the obtaining, furnishing or posting of any such bond or similar instrument. Each of the parties hereby irrevocably submits
with regard to any such Action for itself and in respect of its property, generally and unconditionally, to the personal jurisdiction
of the aforesaid courts and agrees that it will not bring any action relating to this Agreement or any of the Transactions in any court
other than the aforesaid courts. Each of the parties hereby irrevocably waives, and agrees not to assert, by way of motion, as a defense,
counterclaim or otherwise, in any Action with respect to this Agreement, (i) any claim that it is not personally subject to the jurisdiction
of the above named courts for any reason other than the failure to serve in accordance with this Section 6.4(b), (ii) any claim
that it or its property is exempt or immune from jurisdiction of any such court or from any legal process commenced in such courts (whether
through service of notice, attachment prior to judgment, attachment in aid of execution of judgment, execution of judgment or otherwise)
and (iii) to the fullest extent permitted by the applicable Law, any claim that (x) the Action in such court is brought in an inconvenient
forum, (y) the venue of such Action is improper or (z) this Agreement, or the subject matter hereof, may not be enforced in or by such
courts. Each of Parent, Merger Sub I, Merger Sub II and the Stockholder hereby consents to service being made through the notice procedures
set forth in Section 6.5 and agrees that service of any process, summons, notice or document by registered mail (return receipt requested
and first-class postage prepaid) to the respective addresses set forth in Section 6.5 shall be effective service of process for any Action
in connection with this Agreement or the Transactions.

 

(c)         
EACH OF THE PARTIES TO THIS AGREEMENT KNOWINGLY, INTENTIONALLY AND VOLUNTARILY WITH AND UPON THE ADVICE OF COMPETENT COUNSEL IRREVOCABLY
WAIVES ALL RIGHT TO A TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS AGREEMENT. EACH PARTY
HERETO (I) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH PARTY
WOULD NOT, IN THE EVENT OF ANY ACTION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (II) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO
HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVER AND CERTIFICATIONS IN THIS SECTION 6.4c).

 

(d)         
The parties agree that irreparable damage would occur and that the parties would not have any adequate remedy at law in the event
that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached (including
if any of the parties hereto fail to take any action required of them hereunder to consummate the Transactions) and that money damages
or other legal remedies, even if available, would not be an adequate remedy for any such failure to perform or breach. Accordingly, each
of Parent, Merger Sub I, Merger Sub II and the Stockholder shall be entitled to specific performance of the terms hereof, an injunction
or injunctions or other equitable relief to prevent breaches of this Agreement and to enforce specifically the terms and provisions of
this Agreement in the Delaware Court of Chancery, without proof of damages or otherwise, this being in addition to any other remedy to
which such party is entitled at law or in equity and no party will allege, and each party hereby waives the defense or counterclaim, that
there is an adequate remedy at law. Each of the parties hereby further waives any requirement under any law to post security as a prerequisite
to obtaining equitable relief.

 

    8

     

    

 

Section 6.5           
Notices. All notices and other communications hereunder shall be in writing and shall be deemed duly given (a) on the date
of delivery, if delivered personally, (b) at the time sent (provided there is no automated return email indicating that the email
address is no longer valid or active or the recipient is unavailable), if by email (to be followed by delivery by another method provided
for in this Section 6.5) or (c) on the first Business Day following the date of dispatch, if delivered utilizing a next-day service
by a recognized next-day courier (with proof of delivery from such recognized next-day courier). All notices hereunder shall be delivered
to the addresses set forth below or pursuant to such other instructions as may be designated in writing by the party to receive such notice:

 

if to Parent, Merger
Sub I or Merger Sub II, to:

 

Desktop Metal, Inc.

63 Third Avenue

Burlington, MA 01803

Attention: Meg Broderick

E mail: meg.broderick@desktopmetal.com

 

with a copy (which
shall not constitute notice) to:

 

Latham & Watkins LLP

200 Clarendon Street

Boston, MA 02116

Attention: Daniel Hoffman and Jason
Morelli

Email: Daniel.Hoffman@lw.com; Jason.Morelli@lw.com

 

if to the Stockholder,
addressed to it at:

 

S. Kent Rockwell

127 Industry Boulevard

North Huntingdon, PA 15642

E mail: skentr@rockwellvc.com

 

with a copy (which shall not constitute
notice) to:

 

McGuireWoods LLP

Tower Two-Sixty

260 Forbes Avenue

Suite 1800

Pittsburgh, PA 15222

	E mail:	hfrank@mcguirewoods.com;
	 	swestwood@mcguirewoods.com
	 	gregan@mcguirewoods.com

	Attention:	Hannah T. Frank
	 	Scott E. Westwood
	 	Gary S. Regan

 

    9

     

    

 

with a copy (which shall not constitute
notice) to:

 

Blank Rome LLP

501 Grant Street, Suite 850

Pittsburgh, PA 15219

	E mail:	 jbarnes@blankrome.com
	 	mvtrainor@blankrome.com

	Attention:	James J. Barnes
	 	Masha Trainor

 

Section 6.6           
Assignment. Neither this Agreement nor any of the rights, interests or obligations hereunder shall be assigned by any of
the Parties hereto, in whole or in part (whether by operation of law or otherwise), without the prior written consent of each of the other
Parties, and any attempt to make any such assignment without such consent shall be null and void. Subject to the preceding sentence, this
Agreement will be binding upon, inure to the benefit of and be enforceable by the Parties and their respective successors and permitted
assigns.

 

Section 6.7           
Severability. Whenever possible, each provision or portion of any provision of this Agreement shall be interpreted in such
manner as to be effective and valid under applicable Law, but if any provision or portion of any provision of this Agreement is held to
be invalid, illegal or unenforceable in any respect under any applicable Law or rule in any jurisdiction, such invalidity, illegality
or unenforceability shall not affect any other provision or portion of any provision in such jurisdiction, and this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid, illegal or unenforceable provision or portion of any provision
had never been contained herein, so long as the economic or legal substance of the Transactions is not affected in any manner materially
adverse to any party. Upon such a determination, the parties shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely as possible in an acceptable manner in order that the Transactions be consummated as originally
contemplated to the fullest extent possible.

 

Section 6.8           
Headings. The headings contained in this Agreement are for reference purposes only and shall not affect in any way the meaning
or interpretation of this Agreement.

 

Section 6.9           
No Third-Party Beneficiaries. Each of the Parties agree that (a) their respective representations, warranties, covenants
and agreements set forth herein are solely for the benefit of the other Parties, in accordance with and subject to the terms of this Agreement,
and (b) this Agreement is not intended to, and does not, confer upon any Person other than the Parties any rights or remedies hereunder,
including the right to rely upon the representations and warranties set forth herein.

 

    10

     

    

 

Section 6.10       
Construction. The Parties have participated jointly in negotiating and drafting this Agreement. In the event that an ambiguity
or a question of intent or interpretation arises, this Agreement will be construed as if drafted jointly by the Parties, and no presumption
or burden of proof will arise favoring or disfavoring any Party by virtue of the authorship of any provision of this Agreement.

 

Section 6.11       
Exhibit. The Exhibits to this Agreement are hereby incorporated and made a part of this Agreement and is an integral part
of this Agreement.

 

Section 6.12       
Expenses. Whether or not the Mergers are consummated, all costs and expenses incurred in connection with this Agreement
and the transactions contemplated hereby shall be paid by the Party incurring or required to incur such expenses.

 

Section 6.13       
Stockholder Capacity. The Stockholder is executing and entering into this Agreement solely in the Stockholder’s capacity
as a Beneficial Owner and record owner of Covered Company Shares, and not in the Stockholder’s capacity as a director, officer,
employee, agent or consultant of the Company. Notwithstanding anything herein to the contrary, nothing herein shall in any way restrict
a director or officer of the Company in the taking of any actions (or failure to act) in his or her capacity as a director or officer
of the Company, or in the exercise of his or her fiduciary duties as a director or officer of the Company, or prevent or be construed
to create any obligation on the part of any director or officer of the Company from taking any action in his or her capacity as such director
or officer, and no action taken solely in the capacity as a director or officer of the Company shall be deemed to constitute a breach
of this Agreement.

 

[Signature
Pages Follow]

 

    11

     

    

 

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

 

	 	PARENT:
	 	 
	 	DESKTOP
    METAL, INC.
	 	 
	 	By:	 /s/ Ric Fulop
	 	 	Name: Ric Fulop
	 	 	Title: Chief Executive Officer
	 	 
	 	MERGER
    SUB I:
	 	 
	 	TEXAS
    MERGER SUB I, INC.
	 	 
	 	By: 	/s/ Meg Broderick
	 	 	Name: Meg Broderick
	 	 	Title: Authorized Person
	 	 
	 	MERGER
    SUB II:
	 	 
	 	TEXAS
    MERGER SUB II, LLC
	 	 
	 	By:	 /s/ Meg Broderick
	 	 	Name: Meg Broderick
	 	 	Title: Authorized Person

 

[Signature
Page To Voting And Support Agreement]

 

     

     

    

 

	 	STOCKHOLDER:
	 	 
	 	/s/
    S. Kent Rockwell
	 	S.
    Kent Rockwell
	 	 
	 	ROCKWELL
    FOREST PRODUCTS, INC.
	 	 
	 	By:	 /s/ S. Kent Rockwell
	 	 	S. Kent Rockwell
	 	 	President

 

[Signature
Page To Voting And Support Agreement]

 

     

     

    

 

EXHIBIT A

EXISTING SHARES

 

	Stockholder	 	Number of Existing Shares	 
	Rockwell Forest Products, Inc.	 	 	4,175,493	 
	 	 	 	 	 
	S. Kent Rockwell	 	 	40,000

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