Document:

EX-10.5

 Exhibit 10.5 

INTEGRAL AD SCIENCE HOLDING CORP. 

RSU AWARD NOTICE 
 Pursuant
to the terms and conditions of the Integral Ad Science Holding Corp. 2021 Omnibus Incentive Plan, as amended from time to time (the “Plan”), Integral Ad Science Holding Corp., a Delaware corporation (the
“Company”), hereby grants to the individual listed below (“you” or the “Participant”) an award of RSUs set forth below. This award of RSUs (this “Award”) is subject to the
terms and conditions set forth herein and in the Restricted Stock Unit Agreement attached hereto as Exhibit A, including the additional terms and conditions for certain countries, as set forth in the appendix attached
thereto (the “Appendix” and, together, the “Agreement”) and the Plan, each of which is incorporated herein by reference. Capitalized terms used herein without definition have the meanings ascribed to such terms in
the Plan. 
  

			
	 Type of Award:
	  	 Other Share-Based Award under Article X of the Plan.

		
	 Participant:
	  	 [•]

		
	 Grant Date:
	  	 [•]

		
	 Total Number of RSUs:
	  	 [•]

 By your signature below, you agree to be bound by the terms and conditions of the Plan, the Agreement, and
this Restricted Stock Unit Award Notice (this “Grant Notice”). You acknowledge that you have reviewed the Agreement, the Plan, and this Grant Notice in their entirety and fully understand all provisions of the Agreement, the Plan,
and this Grant Notice. You hereby agree to accept as binding, conclusive, and final all decisions or interpretations of the Committee regarding any questions or determinations that arise under the Agreement, the Plan, or this Grant Notice. This
Grant Notice may be executed in one or more counterparts (including portable document format (.pdf) and facsimile counterparts), each of which shall be deemed to be an original, but all of which taken together shall constitute one and the same
agreement. 
 [Signature Page Follows] 

 IN WITNESS WHEREOF, the parties hereto have executed this Grant Notice as of the date first
written above. 
  

			
	INTEGRAL AD SCIENCE HOLDING CORP.
		
	By:	 	  

		 	Name: [Name]
		 	Title: [Title]
	
	  

	[Participant]

 [Signature Page to Restricted Stock Unit Award Notice] 

 Exhibit A 

INTEGRAL AD SCIENCE HOLDING CORP. 

RSU AWARD AGREEMENT 
 THIS
RSU AWARD AGREEMENT (this “Agreement”) is entered into by and between the Company and the Participant as of the Grant Date set forth in the Grant Notice to which this Agreement is attached. Capitalized terms used herein without
definition have the meanings ascribed to such terms in the Plan. 
 WHEREAS, the Plan provides for the grant of Other Share-Based Awards;
and 
 WHEREAS, the Committee has determined that it would be in the best interests of the Company and its members to grant the Participant
an Other Share-Based Award in the form of RSUs on the terms and subject to the conditions set forth in this Agreement and the Plan. 
 NOW
THEREFORE, for and in consideration of the premises and the covenants of the parties contained in this Agreement, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, for
themselves and their successors and assigns, hereby agree as follows: 
 1. Grant of RSUs. 

(a) Grant. The Company hereby grants to the Participant the number of RSUs set forth in the Grant Notice on the terms and conditions
set forth in the Grant Notice, this Agreement, and the Plan. 
 (b) Incorporation by Reference. The provisions of the Plan are
incorporated herein by reference. Except as otherwise expressly set forth herein, this Agreement shall be construed in accordance with the provisions of the Plan. 

2. Vesting. The RSUs shall vest with respect to twenty five percent (25%) of the Award on each of the first four (4) anniversaries
of the date of grant, subject to the Participant not incurring a Separation from Service prior to the applicable vesting date. 
 3.
Settlement. The Company shall issue one Share to the Participant for each RSU that becomes vested hereunder within 30 days following the date on which such RSU becomes vested. Notwithstanding the foregoing, if the Participant is employed
and/or resides outside of the United States, the Company, in its sole discretion, may provide for the settlement of the RSUs in the form of (a) a cash payment (in an amount equal to the Fair Market Value of the Shares that correspond to the
vested RSUs) to the extent that settlement in Shares (i) is prohibited under local law, (ii) would require the Participant, or the Company or any of its Affiliates to obtain the approval of any governmental or regulatory body in the
Participant’s country of employment and/or residency, (iii) would result in adverse tax consequences for the Participant or the Company or any of its Affiliates or (iv) is administratively burdensome; or (b) Shares, but require
the Participant to sell such Shares immediately or within a specified period following the Participant’s Separation from Service (in which case, the Participant hereby agrees that the Company shall have the authority to issue sale instructions
in relation to such Shares on the Participant’s behalf). 

  
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 4. Forfeiture. If, prior to the settlement of the RSUs as set forth in
Section 3, (a) the Participant incurs a Separation from Service for any reason, (b) the Participant materially breaches this Agreement, or (c) the Participant fails to meet the tax withholding obligations described in
Section 6, the Participant shall immediately and automatically forfeit all of the Participant’s rights in respect of the RSUs. 

5. Change in Control. Except to the extent Substitute Awards are granted in assumption of, or in substitution for, any then unvested
RSUs granted hereunder, in the event of a Change in Control, if a Participant incurs a Separation from Service within [two (2) years] following such Change in Control, 100% of any then unvested RSUs granted hereunder shall immediately become
fully vested and non-forfeitable, provided that the Participant remains in continuous Service from the Grant Date through the occurrence of the Change in Control. 

6. Rights as Stockholder; Dividend Equivalents. Until such time as the RSUs have been settled pursuant to
Section 3, the Participant shall have no rights as a stockholder, including, without limitation, any right to dividends or other distributions or any right to vote. Notwithstanding the foregoing, if the Company declares any
cash dividend the record date of which occurs while the RSUs are outstanding, the Participant shall be credited a dividend equivalent in an amount equal to the dividend that would have been paid on the Shares underlying the RSUs had such shares been
outstanding on such record date. Any such dividend equivalents shall be subject to the same vesting conditions applicable to the underlying RSU with respect to which they accrue, and shall, if the underlying RSU vests, be paid on the date on which
such RSU is settled in accordance with Section 3. For purposes of clarity, if the RSUs (or any portion thereof) are forfeited by the Participant pursuant to the terms of this Agreement, then the Participant shall also
forfeit the dividend equivalents, if any, accrued with respect to such forfeited RSUs. No interest will accrue on the dividend equivalents between the declaration and payment of the applicable dividends and the settlement of the dividend
equivalents. 
 7. Taxes. 

(a) The Participant acknowledges and agrees that, regardless of any action taken by the Company or, if different, the Affiliate that employs
the Participant (the “Employer”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related items related to the
Participant’s participation in the Plan and legally applicable or deemed applicable to the Participant even if technically due by the Company or an Affiliate (“Tax-Related Items”) is and
remains the Participant’s responsibility and may exceed the amount, if any, actually withheld by the Company or the Employer. The Participant further acknowledges that the Company and/or the Employer (i) make no representations or
undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of the RSUs or the underlying Shares, including, but not limited to, the grant, vesting or settlement of the RSUs,
the subsequent sale of Shares acquired pursuant to such settlement and the receipt of any dividend equivalents and/or dividends and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the RSUs
to reduce or eliminate the Participant’s liability for Tax-Related Items or achieve any particular tax result. Further, if the Participant is subject to Tax-Related
Items in more than one jurisdiction, the Participant acknowledges that the Company and/or the Employer (or former employer, as applicable) may be required to withhold or account for Tax-Related Items in more
than one jurisdiction. 

  
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 (b) To the extent that Tax-Related Items are
payable, the Participant shall make arrangements satisfactory to the Company regarding the payment of any Tax-Related Items in respect of this Award or the Company may mandate the method for satisfying Tax-Related Items, which arrangements include the delivery of cash or cash equivalents, Shares (including previously owned Shares (which is not subject to any pledge or other security interest), net settlement, a
broker-assisted sale, or other cashless withholding or reduction of the amount of shares otherwise issuable or delivered pursuant to this Award), other property, or any other legal consideration the Committee deems appropriate. If the Participant
fails to satisfy such Tax-Related Items, the Company may refuse to issue or transfer any Shares otherwise required to be issued pursuant to this Agreement. If such
Tax-Related Items are satisfied through net settlement or the surrender of previously owned Shares, the maximum number of Shares that may be so withheld (or surrendered) shall be the number of Shares that have
an aggregate Fair Market Value on the date of withholding or surrender approximately equal to the aggregate amount of such tax liabilities determined based on the greatest withholding rates for Tax-Related
Items that may be utilized without creating adverse accounting treatment for the Company with respect to this Award, as determined by the Committee. If the obligation for Tax-Related Items is satisfied through
net settlement, for tax purposes, the Participant is deemed to have been issued the full number of Shares subject to the RSUs, notwithstanding that a number of Shares are held back solely for the purpose of paying the
Tax-Related Items. The Participant will have no further rights with respect to any Shares that are retained by the Company pursuant to this provision. In the event of over-withholding, the Participant may
receive a refund of any over-withheld amount in cash (with no entitlement to the equivalent in Shares), or if not refunded, the Participant may be able to seek a refund from the local tax authorities. In the event of under-withholding, the
Participant may be required to pay any additional Tax-Related Items directly to the applicable tax authority or to the Company and/or the Employer. 

(c) The Participant acknowledges that there may be adverse tax consequences upon the receipt, vesting or settlement of this Award or
disposition of the underlying shares and that the Participant has been advised, and hereby is advised, to consult a tax advisor. The Participant represents that the Participant is in no manner relying on the Board, the Committee, the Company or an
Affiliate or any of their respective managers, directors, officers, employees or authorized representatives (including attorneys, accountants, consultants, bankers, lenders, prospective lenders and financial representatives) for tax advice or an
assessment of such tax consequences. 
 8. Non-Transferability. The RSUs may not, at any time
prior to being settled, be assigned, alienated, pledged, attached, sold, or otherwise transferred or encumbered by the Participant, other than by will or by the laws of descent and distribution. Any such purported assignment, alienation, pledge,
attachment, sale, transfer, or encumbrance shall be void and unenforceable against the Company. 

  
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 9. Miscellaneous. 

(a) Clawback. All awards, amounts, and benefits received or outstanding under the Plan will be subject to clawback, cancellation,
recoupment, rescission, payback, reduction, or other similar action in accordance with the terms of any Company clawback or similar policy or any Applicable Law related to such actions, as may be in effect from time to time. The Participant
acknowledges and expressly agrees 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 Grant Date (including
the forfeiture, clawback, and detrimental conduct terms contained in Section 13.22 of the Plan as of the Grant Date (and any successor terms)), and any term of Applicable Law relating to clawback, cancellation, recoupment, rescission, payback,
or reduction of compensation, and the Company may take such actions as may be necessary to effectuate any such policy or Applicable Law, without further consideration or action. 

(b) Compliance with Laws. The grant of RSUs and the issuance of Shares hereunder shall be subject to, and shall comply with, any
applicable requirements of any foreign and U.S. federal and state securities laws, rules, and regulations (including, without limitation, the provisions of the Securities Act, the Exchange Act, and in each case any respective rules and regulations
promulgated thereunder) and any other law, rule, regulation, or exchange requirement applicable thereto. No shares of Common Stock will be issued hereunder if such issuance would constitute a violation of any applicable law or regulation or the
requirements of any stock exchange or market system upon which the Common Stock may then be listed. In addition, shares of Common Stock will not be issued hereunder unless (a) a registration statement under the Securities Act is in effect at
the time of such issuance with respect to the shares to be issued or (b) in the opinion of legal counsel to the Company, the shares to be issued are permitted to be issued in accordance with the terms of an applicable exemption from the
registration requirements of the Securities Act. The inability of the Company to obtain from any regulatory body having jurisdiction the authority, if any, deemed by the Company’s legal counsel to be necessary for the lawful issuance and sale
of any shares of Common Stock hereunder will relieve the Company of any liability in respect of the failure to issue such shares as to which such requisite authority has not been obtained. As a condition to any issuance of Common Stock hereunder,
the Company may require the Participant to satisfy any requirements that may be necessary or appropriate to evidence compliance with any applicable law or regulation and to make any representation or warranty with respect to such compliance as may
be requested by the Company. 
 (c) Not a Public Offering. If the Participant is employed or resident outside the United
States, the grant of the RSUs is not intended to be a public offering of securities in the Participant’s country of employment (or country of residence, if different). The Company has not submitted any registration statement, prospectus or
other filings with the local securities authorities (unless otherwise required under local law), and the grant of the RSUs is not subject to the supervision of the local securities authorities. 

  
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 (d) Insider Trading; Market Abuse Laws. By participating in the Plan, the
Participant agrees to comply with the Company’s policy on insider trading (to the extent that it is applicable to the Participant). The Participant further acknowledges that, depending on the Participant’s or his or her broker’s
country of residence or where the Shares are listed, the Participant may be subject to insider trading restrictions and/or market abuse laws which may affect the Participant’s ability to accept, acquire, sell or otherwise dispose of Shares,
rights to Shares (e.g., RSUs) or rights linked to the value of Shares, during such times the Participant is considered to have “inside information” regarding the Company as defined by the laws or regulations in the Participant’s
country. Local insider trading laws and regulations may prohibit the cancellation or amendment of orders the Participant places before he or she possessed inside information. Furthermore, the Participant could be prohibited from (i) disclosing
the inside information to any third party (other than on a “need to know” basis) and (ii) “tipping” third parties or causing them otherwise to buy or sell securities. The Participant understands that third parties include fellow
employees. Any restrictions under these laws or regulations are separate from and in addition to any restrictions that may be imposed under any applicable Company insider trading policy. The Participant acknowledges that it is the Participant’s
responsibility to comply with any applicable restrictions, and that the Participant should therefore consult his or her personal advisor on this matter. 

(e) Repatriation; Compliance with Law. The Participant agrees to repatriate all payments attributable to the Shares and/or cash
acquired under the Plan in accordance with applicable foreign exchange rules and regulations in the Participant’s country of employment (and country of residence, if different). In addition, the Participant agrees to take any and all actions,
and consents to any and all actions taken by the Company and any of its Affiliates, as may be required to allow the Company and any of its Affiliates to comply with local laws, rules and/or regulations in the Participant’s country of employment
(and country of residence, if different). Finally, the Participant agrees to take any and all actions as may be required to comply with the Participant’s personal obligations under local laws, rules and/or regulations in his or her country of
employment (and country of residence, if different). 
 (f) Successors. The terms of this Agreement shall be binding upon and inure
to the benefit of the Company and its successors and assigns, and of the Participant and the beneficiaries, executors, administrators, and heirs of the Participant. 

(g) No Waiver; Amendment. No waiver of any right hereunder by any party shall operate as a waiver of any other right, or as a waiver of
the same right with respect to any subsequent occasion for its exercise, or as a waiver of any right to damages. No waiver by any party of any breach of this Agreement shall be held to constitute a waiver of any other breach or a waiver of the
continuation of the same breach. This Agreement may be amended at any time by the Committee, except that no amendment may, without the Participant’s consent, materially impair the Participant’s rights under the Award. 

(h) Severability. The invalidity or unenforceability of any provision of this Agreement shall not affect the validity or enforceability
of any other provision of this Agreement, and each other provision of this Agreement shall be severable and enforceable to the extent permitted by law. 

  
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 (i) Nature of Grant. In accepting the RSUs, the Participant acknowledges and
agrees that: 
 (i) the Plan is established voluntarily by the Company, it is discretionary in nature and it may be modified, amended,
suspended or terminated by the Company, in its sole discretion, at any time (subject to any limitations set forth in the Plan); 
 (ii) the
grant of the RSUs is exceptional, voluntary and occasional and does not create any contractual or other right to receive future grants of RSUs, or benefits in lieu of RSUs, even if RSUs or other awards have been granted in the past; 

(iii) all decisions with respect to future awards, if any, will be at the sole discretion of the Company; 

(iv) the Participant’s participation in the Plan is voluntary; 

(v) the RSUs and the Participant’s participation in the Plan shall not create a right to employment or be interpreted as forming an
employment contract with the Company or any of its Affiliates and shall not interfere with the ability of the Company or the Employer, as applicable, to terminate the Participant’s employment relationship (as otherwise may be permitted under
local law); 
 (vi) unless otherwise agreed with the Company, the RSUs and any Shares acquired upon settlement of the RSUs, and the income
from and value of the same, are not granted as consideration for, or in connection with, any service the Participant may provide as a director of any Subsidiary or Affiliate; 

(vii) the RSUs and any Shares acquired under the Plan and the income and value of the same, are not part of normal or expected compensation
for purposes of calculating any severance, resignation, termination, redundancy, dismissal, end-of-service payments, bonuses, long-service awards, holiday pay, pension
or retirement or welfare benefits or similar payments and in no event should be considered as compensation for, or relating in any way to, past services for the Company, the Employer or any of their Affiliates; 

(viii) the future value of the Shares underlying the RSUs is unknown, indeterminable, and cannot be predicted with certainty; 

(ix) no claim or entitlement to compensation or damages shall arise from forfeiture of the RSUs resulting from the Participant’s
Separation from Service (for any reason whatsoever and whether or not in breach of local labor laws or later found invalid) and, in consideration of the RSUs, the Participant agrees not to institute any claim against the Company or the Employer;

 (x) for purposes of the RSUs, the Participant’s employment will be considered terminated as of the date the Participant is no
longer actively providing service (regardless of the reason for such termination and whether or not later found to be invalid or in breach of employment laws in the jurisdiction where the Participant is providing service or the terms of the
Participant’s employment or service agreement, if any), and unless otherwise determined by the Company, the Participant’s right to vest in the RSUs will terminate as of such date and will not be extended by any notice period (e.g., the
Participant’s period of service would not include any contractual notice period or any period of “garden leave” or similar period 

  
 A-6 

 
mandated under employment laws in the jurisdiction where Participant is providing service or the terms of Participant’s employment or service agreement, if any); the Committee or its
delegate shall have the exclusive discretion to determine when the Participant is no longer actively providing service for purposes of his or her Award (including whether the Participant may still be considered to be providing service while on a
leave of absence); 
 (xi) the RSUs and the benefits evidenced by this Agreement do not create any entitlement not otherwise specifically
provided for in the Plan or provided by the Company in its discretion, to have the RSUs or any such benefits transferred to, or assumed by, another company, nor to be exchanged, cashed out or substituted for, in connection with any corporate
transaction affecting the Shares; and 
 (xii) if the Participant’s local currency is different than the U.S. dollar, neither the
Company nor any of its Affiliates shall be liable for any foreign exchange rate fluctuation between the Participant’s local currency and the U.S. dollar that may affect the value of the RSUs or any amounts due to the Participant pursuant to the
settlement of the RSUs or the subsequent sale of any Shares acquired upon settlement of the RSUs. 
 (j) Unfunded Plan. The award of
RSUs is unfunded and the Participant shall be considered an unsecured creditor of the Company with respect to the Company’s obligations, if any, to issue Shares pursuant to this Agreement. Nothing contained in this Agreement, and no action
taken pursuant to its provisions, shall create or be construed to create a trust of any kind or a fiduciary relationship between the Participant and the Company or any other person. 

(k) Appendix. Notwithstanding any provisions in this Agreement, the RSUs shall be subject to any additional or different terms
and conditions set forth in the Appendix to this Agreement for certain country or countries (the “Appendix”). Moreover, if the Participant relocates to any country included in the Appendix, the special terms and conditions for such
country will apply to the Participant, to the extent the Company determines that the application of such terms and conditions is necessary or advisable for legal or administrative reasons or the Company may establish additional terms to facilitate
the Participant’s relocation. The Appendix constitutes part of this Agreement. 
 (l) Imposition of Other Requirements.
The Company reserves the right to impose other requirements on the Participant’s participation in the Plan, on the RSUs, and on any Shares acquired under the Plan, to the extent the Company determines it is necessary or advisable for legal or
administrative reasons, and to require the Participant to sign any additional agreements or undertakings that may be necessary to accomplish the foregoing. 

(m) Entire Agreement. This Agreement (including the Appendix), the Grant Notice, and the Plan contain the entire agreement and
understanding of the parties hereto with respect to the subject matter contained herein and supersede all prior communications, representations, and negotiations with respect thereto. 

  
 A-7 

 (n) Bound by the Plan. By signing this Agreement, the Participant acknowledges that
the Participant has received a copy of the Plan and has had an opportunity to review the Plan and agrees to be bound by all the terms and provisions of the Plan. In the event of any conflict between the Plan and this Agreement, this Agreement shall
control. 
 (o) Governing Law. The Participant acknowledges and expressly agrees to the governing law terms of Section 13.9 of
the Plan (and any successor terms) and the jurisdiction and waiver of jury trial terms of Section 13.10 of the Plan (and any successor terms). 

(p) Business Days. If any time period for giving notice or taking action hereunder expires on a day that is a Saturday, Sunday, or
holiday in the state in which the Company’s principal executive office is located, the time period shall be automatically extended to the business day immediately following such Saturday, Sunday, or holiday. 

(q) Headings. The headings of the Sections hereof are provided for convenience only and are not to serve as a basis for interpretation
or construction, and shall not constitute a part, of this Agreement. 
 (r) Counterparts. This Agreement may be executed in one or
more counterparts, each of which shall be deemed to be an original, but all of which taken together shall constitute one and the same instrument. 

(s) Section 409A of the Code. It is intended that the RSUs granted pursuant to this Agreement and the provisions of
this Agreement be exempt from or comply with Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), and all provisions of this Agreement shall be construed and interpreted in a manner consistent with the
requirements for avoiding taxes or penalties under Section 409A of the Code. 
 (t) Language. If the Participant is
resident in a country where English is not an official language, the Participant acknowledges and agrees that it is his or her express intent that this Agreement and the Plan and all other documents, notices and legal proceedings entered into, given
or instituted pursuant to the RSUs be drawn up in English. Further, the Participant acknowledges that he or she is sufficiently proficient in English to understand the terms and conditions of this Agreement and any documents related to the Plan or
has had the ability to consult with an advisor who is sufficiently proficient in the English language. If the Participant has received this Agreement or any other document related to the Plan translated into a language other than English and if the
meaning of the translated version is different than the English version, the English version will control. 
 (u) Data
Privacy. The Participant hereby explicitly and unambiguously consents to the collection, use and transfer, in electronic or other form, of the Participant’s personal data as described in this Agreement, the Grant Notice and
any other grant materials by and among, as necessary and applicable, the Company and its Affiliates, for the exclusive purpose of implementing, administering and managing the Participant’s participation in the Plan. 

The Participant understands that the Company, its Affiliates and/or the Employer may hold certain personal information about the
Participant, specifically, [the Participant’s name, home address, email address and telephone number, date of birth, social security or insurance number, passport number or other identification number, salary, nationality, and any Shares or
directorships held in the Company, and details of the RSUs or any other entitlement to Shares, canceled, exercised, vested, unvested or outstanding in the Participant’s favor] (“Data”), for the purpose of implementing,
administering and managing the Plan. 

  
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 The Participant understands that Data will be transferred to Fidelity Stock Plan
Services, LLC and its affiliates or such other stock plan service provider as may be selected by the Company in the future, which is assisting the Company with the implementation, administration and management of the Plan. The Participant
understands that the recipients of Data may be located in the United States or elsewhere, and that the recipients’ country (e.g., the United States) may have different data privacy laws and protections than the Participant’s country. If
the Participant is employed outside the United States, the Participant understands that the Participant may request a list with the names and addresses of any potential recipients of Data by contacting his or her local human resources
representative. The Participant authorizes the Company, the applicable stock plan service provider and any other possible recipients that may assist the Company (presently or in the future) with implementing, administering and managing the Plan to
receive, possess, use, retain and transfer Data, in electronic or other form, for the sole purpose of implementing, administering and managing the Participant’s participation in the Plan. The Participant understands that Data will be held only
as long as is necessary to implement, administer and manage the Participant’s participation in the Plan. If the Participant is employed outside the United States, the Participant understands that he or she may, at any time, view Data, request
additional information about the storage and processing of Data, require any necessary amendments to Data or refuse or withdraw the consents herein, in any case without cost, by contacting in writing his or her local human resources representative.
Further, the Participant understands that he or she is providing the consents herein on a purely voluntary basis. If the Participant does not consent, or if the Participant later seeks to revoke the Participant’s consent, his or her service
status and career will not be affected; the only consequence of refusing or withdrawing the Participant’s consent is that the Company would not be able to grant the RSUs or other equity awards to the Participant or administer or maintain such
awards. Therefore, the Participant understands that refusing or withdrawing the Participant’s consent may affect his or her ability to participate in the Plan. For more information on the consequences of the Participant’s refusal to
consent or withdrawal of consent, the Participant understands that the Participant may contact his or her local human resources representative. 

(v) Consent to Electronic Delivery; Electronic Signature. In lieu of receiving documents in paper format, the Participant agrees,
to the fullest extent permitted by law, to accept electronic delivery of any documents that the Company may be required to deliver (including, without limitation, prospectuses, prospectus supplements, grant or award notifications and agreements,
account statements, annual and quarterly reports and all other forms of communications) in connection with this and any other Award made or offered by the Company. Electronic delivery may be via a Company electronic mail system or by reference to a
location on a Company intranet or third party website to which the Participant has access. The Participant hereby consents to any and all procedures the Company has established or may establish for an electronic signature system for delivery and
acceptance of any such documents that the Company may be required to deliver, and agrees that the Participant’s electronic signature is the same as, and shall have the same force and effect as, the Participant’s manual signature. 

* * * * 

  
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 APPENDIX TO THE AGREEMENT 

COUNTRY-SPECIFIC TERMS, CONDITIONS AND NOTIFICATIONS 

Terms and Conditions 
 This Appendix includes
additional terms and conditions that govern the RSUs granted to the Participant under the Plan if the Participant resides and/or works outside of the United States. Capitalized terms used but not defined herein shall have the meanings ascribed to
them in the Grant Notice, the Plan and/or the Agreement to which this Appendix is attached. 
 If the Participant is a citizen or resident of a country
other than the one in which the Participant is currently working and/or residing, transfers to another country after the Grant Date, is a consultant, changes employment status to a consultant, or is considered a resident of another country for local
law purposes, the Company shall, in its discretion, determine the extent to which the terms and conditions contained herein shall be applicable to the Participant. References to the Employer shall include any entity that engages the
Participant’s services. 
 Notifications 

This Appendix also includes information regarding securities, tax, and certain other issues of which the Participant should be aware with respect to
participation in the Plan. The information is provided solely for the Participant’s convenience and is based on the securities, tax, and other laws in effect in the respective countries as of June 2021. Such laws are often complex and
change frequently. As a result, the Company strongly recommends that the Participant not rely on the information noted herein as the only source of information relating to the consequences of participation in the Plan because the information may be
out of date by the time the Participant vests in or receives Shares underlying the RSUs or sells any Shares. 
 In addition, the information contained in
this Appendix is general in nature and may not apply to the Participant’s particular situation, and the Company is not in a position to assure the Participant of any particular result. Accordingly, the Participant should seek appropriate
professional advice as to how the applicable laws in the Participant’s country may apply to his or her situation. 
 Finally, the Participant
understands that if the Participant is a citizen or resident of a country other than the one in which he or she is currently residing and/or working, transfer to another country after the Grant Date, or is considered a resident of another country
for local law purposes, the notifications contained herein may not be applicable to the Participant in the same manner. 

  
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 EUROPEAN UNION (“EU”) / EUROPEAN ECONOMIC AREA (“EEA”) AND THE UNITED KINGDOM

 Data Privacy Notice. If the Participant resides and/or works in the EU/EEA or the United Kingdom, the following provision replaces
Section 8(u) of the Agreement: 
 The Company, with its principal office at 95 Morton St., 8th Floor, New York, New York 10014,
United States of America, is the controller responsible for the processing of the Participant’s personal data by the Company and the third parties noted below. 

(a) Data Collection, Processing and Usage. Pursuant to applicable data protection laws, the Participant is hereby notified that the
Company collects, processes and uses certain personal information about the Participant for the legitimate purpose of implementing, administering and managing the Plan and generally administering RSUs, specifically [the Participant’s name, home
address, email address and telephone number, date of birth, social security or insurance number, passport number or other identification number, salary, nationality, and any Shares or directorships held in the Company, and details of the RSUs or any
other entitlement to Shares, canceled, exercised, vested, unvested or outstanding in the Participant’s favor] (“Personal Data”). In granting RSUs under the Plan, the Company will collect, process, use, disclose and transfer
(collectively, “Processing”) Personal Data for purposes of implementing, administering and managing the Plan. The Company’s legal basis for the Processing of Personal Data is the Company’s legitimate business interests of
managing the Plan, administering RSUs and complying with its contractual and statutory obligations, as well as the necessity of the Processing for the Company to perform its contractual obligations under this Agreement and the Plan. The
Participant’s refusal to provide Personal Data would make it impossible for the Company to perform its contractual obligations and may affect the Participant’s ability to participate in the Plan. As such, by accepting the RSUs, the
Participant voluntarily acknowledges the Processing of his or her Personal Data as described herein. 
 (b) Outside Service
Providers. The Company and the Employer may transfer Personal Data to Fidelity Stock Plan Services, LLC and its affiliates, an independent service provider based in the United States of America (the “Plan Broker”), which assists
the Company with the implementation, administration and management of the Plan. In the future, the Company may select a different service provider and share the Participant’s Personal Data with another company that serves in a similar manner.
The Processing of Personal Data will take place through both electronic and non-electronic means. Personal Data will only be accessible by those individuals requiring access to it for purposes of implementing,
administering and operating the Plan. When receiving the Participant’s Personal Data, if applicable, the Plan Broker provides appropriate safeguards in accordance with the Standard Contractual Clauses or other appropriate cross-border transfer
solutions. By accepting the RSUs, the Participant understands that the Plan Broker will Process the Participant’s Personal Data for the purposes of implementing, administering and managing the Participant’s participation in the Plan. 

  
 A-11 

 (c) International Personal Data Transfers. The Plan and RSUs are administered in the
United States of America, which means it will be necessary for Personal Data to be transferred to, and Processed in the United States of America. When transferring Personal Data to the United States of America, the Company provides appropriate
safeguards in accordance with the Standard Contractual Clauses or other appropriate cross-border transfer solutions. The Participant may request a copy of the appropriate safeguards with the Plan Broker or the Company by contacting [the
Participant’s human resources representative]. 
 (d) Data Retention. The Company will use the Participant’s personal data
only as long as is necessary to implement, administer and manage his or her participation in the Plan or as required to comply with legal or regulatory obligations, including under tax, exchange control, securities, and labor laws. When the Company
no longer needs Personal Data related to the Plan, the Company will remove it from its systems. If the Company keeps Personal Data longer, it would be to satisfy legal or regulatory obligations and the Company’s legal basis would be for
compliance with Applicable Law. 
 (e) Data Subject Rights. To the extent provided by law, the Participant has the right to
(i) subject to certain exceptions, request access or copies of Personal Data the Company Processes, (ii) request rectification of incorrect Personal Data, (iii) request deletion of Personal Data, (iv) place restrictions on
Processing of Personal Data, (v) lodge complaints with competent authorities in the Participant’s country, and/or (vi) request a list with the names and addresses of any potential recipients of Personal Data. To receive clarification
regarding the Participant’s rights or to exercise the Participant’s rights, the Participant may contact [the Participant’s human resources representative]. The Participant also has the right to object, on grounds related to a
particular situation, to the Processing of Personal Data, as well as opt-out of the Plan, in any case without cost, by contacting [the Participant’s human resources representative] in writing. The
Participant’s provision of Personal Data is a contractual requirement. The Participant understands, however, that the only consequence of refusing to provide Personal Data is that the Company may not be able to administer the RSUs, or grant
other awards or administer or maintain such awards. For more information on the consequences of the refusal to provide Personal Data, the Participant may contact [the Participant’s human resources representative] in writing. 

  
 A-12 

 AUSTRALIA 

Tax Notification. The Plan is a plan to which Subdivision 83A-C of the Income Tax Assessment Act 1997 (Cth) (the
“Act”) applies (subject to conditions in the Act). 
 CANADA 

1. Form of Settlement. Notwithstanding any provision in the Plan or Agreement to the contrary, the RSUs will be settled in Shares only, not cash.

 2. Securities Law Information. The Participant is permitted to sell Shares acquired under the Plan through the designated broker, if any,
provided the resale of such Shares takes place outside of Canada through the facilities of a stock exchange on which the Shares are listed. 
 3.
Separation from Service. The following provision replaces Section 8(i)(x) of the Agreement: 
 For purposes of the
RSUs, the Participant’s service is considered terminated as of the date the Participant is no longer actually employed or otherwise rendering service to the Company or any Affiliate (regardless of the reason for such termination and whether or
not later found to be invalid or in breach of employment or other laws or the terms of the Participant’s employment or service contract, if any). Unless otherwise extended by the Company or expressly provided in the Agreement, the
Participant’s right to vest in the RSUs, if any, will terminate effective as of such date (the “Termination Date”). The Termination Date will not be extended by any common law notice period. Notwithstanding the foregoing,
however, if applicable employment standards legislation explicitly requires continued entitlement to vesting during a statutory notice period, the Participant’s right to vest in the RSUs under the Agreement, if any, will be allowed to continue
for that minimum notice period but then immediately terminate effective as of the last day of the Participant’s minimum statutory notice period. 
 In
the event the date the Participant is no longer providing actual service cannot be reasonably determined under the terms of this Agreement and/or the Plan, the Company shall have the exclusive discretion to determine when the Participant is no
longer actively providing service for purposes of the RSUs (including whether the Participant may still be considered to be providing service while on a leave of absence). Any portion of the RSUs that is not vested on the Termination Date shall
terminate immediately and be null and void. Subject to the foregoing, unless the applicable employment standards legislation specifically requires, in the Participant’s case, the Participant will not earn or be entitled to any pro-rated vesting for that portion of time before the date on which the Participant’s service is terminated (as determined under this provision), nor will the Participant be entitled to any compensation for
lost vesting. 
 The following provision applies to residents of Quebec: 

4. Language Consent. The parties acknowledge that it is their express wish that the Agreement, as well as all documents, notices and legal
proceedings entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. 
 Les parties
reconnaissent avoir expressément souhaité la rédaction en anglais du Contrat d’Attribution, ainsi que tous les documents exécutés, avis donnés et procédures judiciaires intentées, en vertu
du, ou liés directement ou indirectement, au présent Contrat d’Attribution. 

  
 A-13 

 FRANCE 

1. Award Not French-Qualified. The RSUs are not granted under the French specific regime provided by Articles L.
225-197-1 and seq. or L. 22-10-59 and L. 22-10-60 of the French Commercial Code, as amended. 
 2. English Language Consent. The parties
acknowledge and agree that it is their express wish that the Agreement, as well as all documents, notices and legal proceedings entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. 

Les parties reconnaissent avoir expressement souhaité que la convention (“Agreement”), ainsi que tous les documents, avis et
procédures judiciaries, éxecutés, donnés ou intentés en vertu de, ou lié, directement ou indirectement à la présente convention, soient rédigés en langue anglaise. 

GERMANY 
 No country-specific provisions. 

INDIA 
 Repatriation Requirements. The
Participant expressly agrees to repatriate all dividends and sale proceeds attributable to Shares acquired under the Plan in accordance with local foreign exchange rules and regulations. Neither the Company nor any of its Affiliates shall be liable
for any fines or penalties resulting from the Participant’s failure to comply with applicable laws, rules or regulations. 
 ITALY 

Plan Document Acknowledgment. In accepting the RSUs, the Participant acknowledges that he or she has received a copy of the Plan and the Agreement and
has reviewed the Plan and the Agreement, including this Appendix, in their entirety and fully understands and accepts all provisions of the Plan and the Agreement, including this Appendix. 

More specifically, the Participant acknowledges that he or she has read and specifically and expressly approves the following sections of the Agreement:
Section 2 (Vesting); Section 3 (Settlement); Section 4 (Forfeiture); the data privacy provisions in the Appendix for Participants that reside and/or work in the EU/EEA and
the United Kingdom; and the terms and conditions in this Appendix. 
 JAPAN 

No country-specific provisions. 

  
 A-14 

 SINGAPORE 

Securities Law Information. The grant of the RSUs under the Plan is being made pursuant to the “Qualifying Person” exemption under section
273(1)(f) of the Securities and Futures Act (Chapter 289, 2006 Ed.) (“SFA”). The Plan has not been and will not be lodged or registered as a prospectus with the Monetary Authority of Singapore and is not regulated by any financial
supervisory authority pursuant to any legislation in Singapore. Accordingly, statutory liability under the SFA in relation to the content of prospectuses would not apply. The Participant should note that the RSUs are subject to section 257 of the
SFA and the Participant will not be able to make any subsequent sale of the underlying Shares in Singapore, or any offer of such subsequent sale of the Shares subject to the RSUs in Singapore, unless such sale or offer is made (i) after
six (6) months from the date of grant or (ii) pursuant to the exemptions under Part XIII Division (1) Subdivision (4) (other than section 280) of the SFA. 

SPAIN 
 1. Acknowledgement of Discretionary
Nature of the Plan; No Vested Rights. This provision supplements the terms of the Agreement: 
 In accepting the RSUs, the Participant acknowledges that
he or she consents to participation in the Plan and has received a copy of the Plan. 
 The Participant understands that the Company has unilaterally,
gratuitously and in its sole discretion granted the RSUs under the Plan to individuals who may be employees of the Company and its Affiliates throughout the world. The decision is a limited decision that is entered into upon the express assumption
and condition that any grant will not economically or otherwise bind the Company or any of its Affiliates on an ongoing basis. Consequently, the Participant understands that the RSUs are granted on the assumption and condition that the RSUs and the
Shares acquired upon settlement of the RSUs shall not become a part of any employment contract (either with the Company or any of its Affiliates) and shall not be considered a mandatory benefit, salary for any purposes (including severance
compensation) or any other right whatsoever. In addition, the Participant understands that this grant would not be made to the Participant but for the assumptions and conditions referenced above; thus, the Participant acknowledges and freely accepts
that should any or all of the assumptions be mistaken or should any of the conditions not be met for any reason, the grant of the RSUs shall be null and void. 

The Participant understands and agrees that, as a condition of the grant of the RSUs, the Participant’s Separation from Service for any reason (including
the reasons listed below) will automatically result in the loss of the RSUs to the extent the RSUs has not vested as of date that the Participant ceases active employment. In particular, the Participant understands and agrees that unless otherwise
provided in the Agreement, any portion of the RSUs that is unvested as of the date the Participant ceases active employment will be forfeited without entitlement to the underlying Shares or to any amount of indemnification in the event of the
termination of employment by reason of, but not limited to, disciplinary dismissal adjudged to be with cause, disciplinary dismissal adjudged or recognized to be without cause, individual or collective dismissal on objective grounds, whether
adjudged or recognized to be with or without cause, material modification of the terms of employment under Article 41 of the Workers’ Statute, relocation under Article 40 of the Workers’ Statute, Article 50 of the Workers’
Statute, unilateral withdrawal by the Employer and under Article 10.3 of the Royal Decree 1382/1985. The Participant acknowledges that he or she has read and specifically accepts the conditions referred to in the Agreement regarding the impact of a
Separation from Service on the Participant’s RSUs. 

  
 A-15 

 2. Securities Law Information. The RSUs and the Shares described in this Agreement do not qualify
under Spanish regulations as securities. With respect to the grant of RSUs under the Plan, no “offer of securities to the public,” as defined under Spanish law, has taken place or will take place in the Spanish territory. The Agreement has
not been nor will it be registered with the Comisión Nacional del Mercado de Valores, and does not constitute a public offering prospectus. 

SWEDEN 
 Tax Withholding. The following
provision shall supplement Section 6 of the Agreement: 
 Without limiting the Company’s and the Employer’s authority to
satisfy their withholding obligations for Tax-Related Items as set forth in the Section 6 of the Agreement, in accepting the grant of the RSUs, the Participant authorizes the Company to withhold Shares
otherwise deliverable to the Participant upon settlement of the RSUs or sell Shares issued upon settlement of the RSUs to satisfy Tax-Related Items, regardless of whether the Company and/or the Employer has an
obligation to withhold such Tax-Related Items. 
 UNITED KINGDOM 

1. Taxes. This provision shall supplement Section 6 of the Agreement: 

Without limitation to Section 6 of the Agreement, the Participant agrees that he or she is liable for all
Tax-Related Items and hereby covenants to pay all such Tax-Related Items, as and when requested by the Company, the Employer or by Her Majesty’s Revenue and Customs
(“HMRC”) (or any other tax authority or any other relevant authority). The Participant also agrees to indemnify and keep indemnified the Company and the Employer against any Tax-Related Items
that they are required to pay or withhold or have paid or will pay on the Participant’s behalf to HMRC (or any other tax authority or any other relevant authority). 

Notwithstanding the foregoing, if the Participant is a director or executive officer (as within the meaning of Section 13(k) of the Exchange Act), the
terms of the immediately foregoing provision will not apply. In the event that the Participant is a director or executive officer and income tax due is not collected from or paid by the Participant by within 90 days after the U.K. tax year in which
an event giving rise to the indemnification described above occurs, the amount of any uncollected tax may constitute a benefit to the Participant on which additional income tax and national insurance contributions may be payable. The Participant
acknowledges that the Participant ultimately will be responsible for reporting and paying any income tax due on this additional benefit directly to HMRC under the self-assessment regime and for reimbursing the Company or the Employer (as applicable)
for the value of any employee national insurance contributions due on this additional benefit, which the Company and/or the Employer may recover from the Participant at any time thereafter by any of the means referred to in Section 6 of the
Agreement. 

  
 A-16 

 2. Exclusion of Claim. The Participant acknowledges and agrees that the Participant will have
no entitlement to compensation or damages insofar as such entitlement arises or may arise from the Participant ceasing to have rights under or to be entitled to the RSUs, whether or not as a result of a Separation from Service (whether the
termination is in breach of contract or otherwise), or from the loss or diminution in value of the RSUs. Upon the grant of the RSUs, the Participant will be deemed to have waived irrevocably any such entitlement. 

* * * * 

  
 A-17EX-10.6

 Exhibit 10.6 

INTEGRAL AD SCIENCE HOLDING CORP. 

AMENDED AND RESTATED 

2018 NON-QUALIFIED STOCK OPTION PLAN 

This Amended and Restated 2018 Non-Qualified Stock Option Plan (this “Plan”) constitutes an amendment
and restatement of the Kavacha Topco, LLC 2018 Unit Option Plan (the “LLC Plan”). This Plan supersedes and replaces the LLC Plan in its entirety. 

1. Purpose of Plan. 
 This Plan is
designed to provide incentives to such present and future employees, managers, officers, consultants or advisors of the Company or its Subsidiaries (“Participants”), as may be selected in the sole discretion of the Committee,
through the grant of Options by the Company to such Participants. This Plan is a compensatory benefit plan within the meaning of Rule 701 of the Securities Act (as defined below) and, unless and until the Company’s Common Stock is publicly
traded, the issuance of options to purchase shares of the Company’s Common Stock pursuant to the Plan and the issuance of shares of Common Stock pursuant to such options are, to the extent permitted by applicable federal securities laws,
intended to qualify for the exemption from registration under Rule 701 of the Securities Act, and the qualification requirements under applicable state blue sky laws (collectively, the “Exemptions”). In the event that any provision
of the Plan would cause any option granted under the Plan to not qualify for the Exemptions, the Plan shall be deemed automatically amended to the extent necessary to cause all Options granted under the Plan to qualify for the Exemptions. 

2. Definitions. “Affiliate” means a corporation or other entity that, directly or indirectly, controls,
is controlled by or is under common control with, the Company. 
 “Board” means the Company’s board of directors. 

“Cause” shall have the meaning ascribed to such term in any written offer letter or employment or severance agreement between
the Company or any Subsidiary of the Company and such Participant, or in the absence of any such written agreement, shall mean (i) the commission of a felony or any other act or omission involving dishonesty, disloyalty or fraud with respect to
the Company or any of its Subsidiaries or any of their customers or suppliers if the act or omission was wrongful or deliberate, or any other crime involving moral turpitude, (ii) conduct tending to bring the Company or any of its Subsidiaries
into public disgrace or disrepute or economic harm, (iii) repeated material failure or inability to perform duties and/or obligations as reasonably directed by the Board or its designees, after demand for performance has been given by the Board
or its designees that identifies how such Participant has not performed its duties and/or obligations, (iv) gross negligence or misconduct with respect to the Company or any of its Subsidiaries, (v) such Participant’s personal
bankruptcy or insolvency, (vi) any other material breach of (A) any written agreement between the Company and such Participant evidencing the grant of any Option, (B) the Company’s written code of conduct and business ethics or
(C) any other written agreement between such Participant and the Company or any Subsidiary of the Company, or (vii) excessive and unreasonable absences from such Participant’s duties for any reason (other than authorized vacation or
sick leave) or as a result of such Participant’s inability to perform the essential duties, responsibilities and functions of its position with the Company as a result of any mental or physical disability or incapacity, which continues for 60
business days in any consecutive 6 month period. 

 “Code” means the Internal Revenue Code of 1986, as amended, and the
regulations promulgated thereunder, as the same may be amended from time to time and any successor statute. 
 “Committee”
shall mean the committee of the Board which may be designated by the Board to administer the Plan. The Committee shall be composed of two or more directors as appointed from time to time to serve by the Board. In the absence of the appointment of
any such Committee, any action permitted or required to be taken hereunder shall be deemed to refer to the Board. 
 “Common
Stock” means the common stock of the Company, par value $[•] per share. 
 “Company” means Integral Ad
Science Holding Corp. 
 “Company Group” means the Company and its Subsidiaries. 

“Competitive Activity” means, with respect to a Participant, during the term of such Participant’s employment with the
Company or any of its Subsidiaries and during the two year period immediately following such Participant’s Termination Date, directly or indirectly, for himself or herself or for any other Person, Participating in any Competitive Business or
any business in which the Company is engaged or is planning to engage as of such Participant’s Termination Date; provided, that the passive ownership by such Participant of not more than one percent (1%) of the outstanding shares of any
class of equity of an organization which is publicly traded on a national securities exchange will not be deemed to be a Competitive Activity, so long as such Participant has no active Participation in the business of such organization. 

“Competitive Business” means any business in the geographic area set forth in the
non-competition provision in any written employment or severance agreement between the Company or any Subsidiary of the Company and such Participant (or, in the absence of the designation of any such
geographic area in any such written agreement, any geographic area or country where the Company or any Subsidiary of the Company generates revenues) engaged in the “Restricted Business” set forth in the
non-competition provision in any written employment or severance agreement between the Company or any Subsidiary of the Company and such Participant (or, in the absence of the designation of any such
“Restricted Business” in any such written agreement, in the provision of services related to any product, business, activity or service line of any person, entity or company that is in competition with any product, business, activity or
service line of the Company or within any industry related to the use of data collection and analytics, research and design, development, sales, licensing, marketing, or provision of ad verification and related optimization services and software
and/or the provision of related products, services and solutions).“Effective Date” means the effective date of the LLC’s conversion into a Delaware corporation pursuant to a statutory conversion. 

  
 2 

 “Fair Market Value” of an Option means the fair market value thereof as
determined by the Board or the Committee. 
 “Independent Third Party” means any Person who, immediately prior to the
contemplated transaction, does not own in excess of 10% of the Common Stock on a fully-diluted basis (a “10% Owner”), who is not controlling, controlled by or under common control with any such 10% Owner and who is not the spouse or
descendant (by birth or adoption) of any such 10% Owner or a trust for the benefit of such 10% Owner and/or such other Persons. 

“Investors” means Vista Equity Partners Fund VI, L.P., Vista Equity Partners Fund
VI-A, L.P., VEPF VI FAF, L.P. and/or any transferee of Vista Equity Partners Fund VI, L.P., Vista Equity Partners Fund VI-A, L.P., VEPF VI FAF, L.P. and any Affiliate of
any of the foregoing Persons that holds Common Stock, and “Investor” means any of the Investors individually. 

[“Investor Fund” means one or more equity buy-out investment funds (including Vista Equity
Partners Fund VI, L.P.) managed or controlled by VEPF Management, L.P. or any successor management company, and any of such fund’s respective portfolio companies, (excluding the Company and its Subsidiaries) and their respective partners,
members, directors, employees, stockholders, agents, any successor by operation of law (including by merger) of any such Person, and any entity that acquires all or substantially all of the assets of any such Person in a single transaction or series
of related transactions.] 
 “Investor Returns Target” means $1,170,000,000. 

“IPO” means the Company’s initial public offering and sale of its equity pursuant to an effective registration statement
filed with the U.S. Securities and Exchange Commission under the Securities Act. 
 “LLC” means Kavacha Topco, LLC. 

“LLC Options” means options to purchase LLC Units, previously granted under the LLC Plan. 

“LLC Units” means units in the LLC. 

“Option” means any option enabling the holder thereof to purchase any shares of Common Stock granted by the Committee
pursuant to the provisions of this Plan. 
 “Option Shares” means the shares of Common Stock acquired (or to be acquired)
pursuant to the exercise of any Option. 
 “Original Cost” of each Option Share will be equal to the price paid therefor
(in each case, as proportionally adjusted for all splits, dividends, distributions and other recapitalizations affecting such Shares subsequent to any such purchase). 

“Participate” (and the correlative terms “Participating” and “Participation”) includes any
direct or indirect ownership interest in any enterprise or participation in the management of such enterprise, whether as an officer, manager, employee, partner, sole proprietor, agent, representative, independent contractor, consultant, executive,
franchisor, franchisee, creditor, owner or otherwise. 

  
 3 

 “Person” means an individual, a partnership, a corporation, a limited
liability company, an association, a joint share company, a trust, a joint venture, an unincorporated organization and a governmental entity or any department, agency or political subdivision thereof. 

“Sale of the Company” means (i) any sale or transfer by the Company or any of the Significant Subsidiaries of all or
substantially all (as defined under Delaware law) of their assets on a consolidated basis, or (ii) any consolidation, merger or reorganization of the Company or any of its Significant Subsidiaries with or into any other entity or entities as a
result of which any Person or group other than the Investors obtains possession of voting power (under ordinary circumstances) to elect a majority of the surviving entity’s board of directors or, in the case of a surviving entity which is not a
corporation, governing body. 
 “Securities Act” means the Securities Act of 1933, as amended. 

“Significant Subsidiaries” means Kavacha Intermediate, LLC, Kavacha Holdings, Inc., Integral Ad Science, Inc. and any direct
or indirect holding company of Integral Ad Science, Inc. 
 “Solvent Reorganization” means any solvent reorganization of
the Company or any Subsidiary of the Company, including by merger, consolidation, recapitalization, transfer or sale of shares or assets, or contribution of assets and/or liabilities, or any liquidation, exchange of securities, conversion of entity,
migration of entity, formation of new entity, or any other transaction or group of related transactions (in each case other than to or with a third party that is not a member of the Company Group or its Affiliates (which Affiliates may include an
entity formed for the purpose of such Solvent Reorganization)), in which: 
 (i) all holders of Option Shares are offered the same
consideration in respect of such Option Shares; 
 (ii) the pro rata indirect economic interests of the holders of Option Shares in the
business of the Company, relative to each other and all other holders, directly or indirectly, of equity securities in the Company Group (other than those held by entities within the Company Group), are preserved; and 

(iii) the rights of the holders of Option Shares are preserved in all material respects (it being understood by way of illustration and not
limitation that the relocation of a covenant or restriction from one instrument to another shall be deemed a preservation if the relocation is necessitated, by virtue of any law or regulations applicable to the Company Group following such Solvent
Reorganization, as a result of any change in jurisdiction or form of entity in connection with the Solvent Reorganization; provided, that such covenants and restrictions are retained in instruments that are, as nearly as practicable and to
the extent consistent with business and transactional objectives, equivalent to the instruments in which such restrictions or covenants were contained prior to the Solvent Reorganization). 

  
 4 

 “Strategic Transaction” means a transaction with or involving a strategic
partner (i.e., a Person who, as determined by the Board, will benefit the Company as a result of experience, expertise, knowledge or relationships). 

“Subsidiary” means any corporation or other entity of which the securities or other ownership interests having the voting
power to elect a majority of the board of directors or other governing body are, at the time of determination, owned by the Company, directly or through one or more Subsidiaries. 

“Termination Date” means the first date on which a Participant is no longer employed (or in the case of a Participant who was
not an employee, the first date on which such Participant is no longer acting as a manager or officer of, or consultant or advisor to, the Company or its Subsidiaries) by the Company or its Subsidiaries for any reason. 

“Termination Event” means the first to occur of (i) the Sale of the Company, (ii) the sale or transfer to any third
party of Common Stock or shares of the capital stock of any Significant Subsidiary by the holders thereof as a result of which any Person or group other than the Investors obtains possession of voting power (under ordinary circumstances) to elect a
majority of the Company’s board of managers or the board of directors or any other governing body of the applicable Significant Subsidiary, or (iii) at any time following the IPO, a sale of shares of the Company by the Investor following
which the cumulative total of all cash distributions made to, or other cash proceeds received by, the Investor Fund (excluding management or transaction fees and expenses, any other advisory fees and expenses, any board fees and expenses or any
other expenses borne by the Investor Fund) in respect of its ownership of equity or debt securities of the Company or any of its Subsidiaries or any loans provided by the Investor Fund during the life of the Investor Fund’s investment period,
equals or exceeds the Investor Returns Target; provided that, for purposes of calculating distributions and proceeds under this clause (iii), all distributions made to the Investor Fund will be net of all accrued but unpaid management fees, all
expenses associated with the Sale of the Company borne by the Investor Fund, and assuming, for purposes of the calculation made above, the vesting (and exercise, if applicable) (prior to the calculation of the Investor Return) of all outstanding
options, warrants and other outstanding rights to acquire capital stock of the Company. 
 4. Grant of Options. The Committee shall
have the right and power to grant to any Participant such Options at any time prior to the termination of this Plan in such quantity, at such exercise price, which may be Fair Market Value or such other value as determined by the Committee and set
forth in a written award agreement with respect to an Option, and on such other terms and subject to such conditions that are consistent with this Plan and established by the Committee. Options granted under this Plan shall be subject to such terms
and conditions and evidenced by agreements as shall be determined from time to time by the Committee. Any Participant acquiring Common Stock pursuant to an Option shall be required to pay in full the exercise price related thereto, except as
otherwise set forth in a written award agreement with respect to an Option. 

  
 5 

 5. Administration of the Plan. The Committee shall have the power and authority to
prescribe, amend and rescind rules and procedures governing the administration of this Plan, including, but not limited to, the full power and authority (a) to interpret the terms of this Plan, the terms of any Options granted under this Plan
and the rules and procedures established by the Committee governing any such Options, (b) to determine the rights of any person under this Plan or the meaning of requirements imposed by the terms of this Plan or any rule or procedure
established by the Committee, (c) to correct any defect or omission or reconcile any inconsistency in the Plan or in any Option granted hereunder, (d) to determine whether any Options are subject to and/or comply with the requirements of
Code Section 409A or the regulations thereunder and (e) to make all other determinations and take all other actions necessary or advisable for the implementation and administration of the Plan. Each action of the Committee shall be binding
on all persons. Notwithstanding any provision to the contrary contained in this Plan or any separate written agreement between the Company and any Participant with respect to any Option pursuant to this Plan, any unvested Options that do not become
vested immediately prior to, or in connection with, any Sale of the Company shall be forfeited and cancelled with concurrent effect upon the consummation of any such transaction, and no Participant nor any other Person shall have any further rights
or obligations with respect to such forfeited Options. 
 It is the Company’s intent that, except as otherwise specifically provided in
a written award agreement with respect to an Option, the Options not be treated as a nonqualified deferred compensation plan that fails to meet the requirements of Section 409A(a)(2), (3) or (4) of the Code and that any ambiguities in
construction be interpreted in order to effectuate such intent. Options under the Plan shall contain such terms as the Committee determines are appropriate to be exempt from, or comply with, the requirements of Section 409A of the Code. In the
event that, after the issuance of an Option under the Plan, Section 409A of the Code or the regulations thereunder are amended, or the Internal Revenue Service or Treasury Department issues additional guidance interpreting Section 409A of
the Code, the Committee may modify the terms of any such previously issued Option to the extent the Committee determines that such modification is necessary to comply with the requirements of Section 409A of the Code. In no event whatsoever
shall the Company be liable for any additional tax, interest or penalty that may be imposed on any Participant by Code Section 409A or damages for failing to comply with Code Section 409A. 

6. Limitation on the Aggregate Number of Common Stock. The amount of Common Stock issued under this Plan (including the amount of
Common Stock with respect to which Options may be granted under this Plan (and which may be issued upon the exercise or payment thereof)) shall not exceed, in the aggregate, [•] shares (as such number is equitably adjusted pursuant to
Section 7 hereof). If any Options expire unexercised or unpaid or are canceled, terminated or forfeited in any manner without the issuance of Common Stock or payment thereunder, the Common Stock with respect to which such
Options were granted shall again be available under this Plan. Similarly, if any Common Stock issued hereunder upon exercise of Options are repurchased hereunder, such Common Stock shall again be available under this Plan for reissuance as Options.
Common Stock to be issued upon exercise of the Options may be either authorized and unissued Common Stock, treasury shares, or a combination thereof, as the Committee shall determine. 

7. Listing, Registration and Compliance with Laws and Regulations. Each Option shall be subject to the requirement that if at any time
the Committee shall determine, in its discretion, that the listing, registration or qualification of the Common Stock subject to the Option upon any securities exchange or under any federal, state or foreign securities or other law or regulation, or
the consent or approval of any governmental regulatory body, is necessary or 

  
 6 

 
desirable as a condition to or in connection with the granting of such Option or the issue or purchase of Common Stock thereunder, no such Option may be exercised or paid in Common Stock in whole
or in part unless such listing, registration, qualification, consent or approval (a “Required Listing”) shall have been effected or obtained, and the holder of each such Option will supply the Company with such certificates,
representations and information as the Company shall request which are reasonably necessary or desirable in order for the Company to obtain such Required Listing, and shall otherwise cooperate with the Company in obtaining such Required Listing. In
the case of officers and other persons subject to Section 16(b) of the Securities Exchange Act of 1934, as amended, the Committee may at any time impose any limitations upon the exercise of an Option which, in the Committee’s discretion,
are necessary or desirable in order to comply with Section 16(b) and the rules and regulations thereunder. If the Company, as part of an offering of securities or otherwise, finds it desirable because of federal, state or foreign regulatory
requirements to reduce the period during which any Option may be exercised, the Committee may, in its discretion and without the consent of the holders of any such Option, so reduce such period on not less than 15 days’ written notice to the
holders thereof. 
 8. Adjustment for Change in Common Stock. In the event of a reorganization, recapitalization, split,
extraordinary dividend, combination of Common Stock, merger, consolidation or other change in Common Stock, the Committee shall make appropriate changes in the number and type of shares authorized by this Plan, the number and type of shares covered
by outstanding Options and the exercise prices specified therein. 
 9. Taxes. The Company shall be entitled, if necessary or
desirable, to withhold (or secure payment from the Participant in lieu of withholding) the amount of any withholding or other tax due with respect to any amount payable and/or shares of Common Stock issuable under this Plan, and the Company may
defer any such payment or issuance unless and until indemnified to its satisfaction. 
 10. Termination and Amendment. The Committee
at any time may suspend or terminate this Plan and make such additions or amendments as it deems advisable under this Plan, except that it may not, without further approval by the Company’s Members, (a) increase the maximum number of
shares as to which Options may be granted under this Plan, except pursuant to Section 7 above or (b) extend the term of this Plan; provided, that, subject to the other provisions hereof, the Committee may not
change any of the terms of a written agreement with respect to an Option between the Company and the holder of such Option in a manner which would have a material adverse effect on the holder of such Option without the approval of the holder of such
Option. No Options shall be granted or shares of Common Stock issued hereunder after the tenth anniversary of the Effective Date. 
 11.
Participant Acknowledgments. In connection with the grant of any Option and/or the issuance of any Common Stock pursuant to this Plan, each Participant acknowledges and agrees, that as a condition to any such grant or issuance: 

(a) The Company will have no duty or obligation to disclose to any Participant, and no Participant will have any right to be advised of, any
material information regarding the Company or its Subsidiaries at any time prior to, upon or in connection with the repurchase of any Option Shares upon the termination of such Participant’s employment with the Company or its Subsidiaries or as
otherwise provided under this Plan or any written agreement evidencing the grant of any Option or the issuance of any shares of Common Stock. 

  
 7 

 (b) Neither the grant of any Option, the issuance of any Common Stock nor any provision
contained in this Plan or in any written agreement evidencing the grant of any Option or the issuance of any Common Stock shall entitle such Participant to remain in the employment of the Company or its Subsidiaries or affect the right of the
Company to terminate any Participant’s employment at any time for any reason. 
 (c) Such Participant will have consulted, or will have
had an opportunity to consult with, independent legal counsel regarding his or her rights and obligations under this Plan and any written agreement evidencing any grant of any Option or the issuance of any Common Stock and he or she fully
understands the terms and conditions contained herein and therein. 
 (d) Prior to the purchase of any shares of Common Stock pursuant to
this Plan or any written agreement evidencing the purchase of any shares of Common Stock, such Participant will deliver to the Company an executed consent from such Participant’s spouse (if any) in the form of Exhibit 1 attached hereto.
If, at any time subsequent to the date such Participant purchases any shares of Common Stock and prior to the occurrence of a Termination Event, such Participant becomes legally married (whether in the first instance or to a different spouse), such
Participant shall cause his or her spouse to execute and deliver to the Company a consent in the form of Exhibit 1 attached hereto. Such Participant’s failure to deliver the Company an executed consent in the form of Exhibit 1 at
any time when such Participant would otherwise be required to deliver such consent shall constitute such Participant’s continuing representation and warranty that such Participant is not legally married as of such date. 

12. Definition of Option Shares. For all purposes of this Plan, Option Shares will continue to be Option Shares in the hands of any
holder other than such Participant (except for the Company, the Investors or purchasers pursuant to an offering registered under the Securities Act or purchasers pursuant to a Rule 144 transaction (other than a Rule 144(k) transaction occurring
prior to the time of a closing of an IPO)), and each such other holder of Option Shares will succeed to all rights and obligations attributable to such Participant as a holder of Option Shares hereunder and under any separate written agreement
between the Company and such Participant. Option Shares will also include shares of the Company’s shares issued with respect to Option Shares by way of a split, dividend or other recapitalization. 

13. Transfers in Violation of Plan. Any transfer or attempted transfer of any Option Shares in violation of any provision of this Plan
shall be void, and the Company shall not record such transfer on its books or treat any purported transferee of such Option Shares as the owner of such Common Stock for any purpose. 

14. Severability. Whenever possible, each provision of this Plan will be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Plan 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 will not affect any other
provision or any other jurisdiction, but this Plan will be reformed, construed and enforced in such jurisdiction as if such invalid, illegal or unenforceable provision had never been contained herein. 

  
 8 

 15. Remedies. Each of the Company, any Participant and the Investors will be entitled
to enforce its rights under this Plan specifically, to recover damages and costs (including reasonable attorneys’ fees) caused by any breach of any provision of this Plan and to exercise all other rights existing in its favor. Each Participant
and the Company acknowledges and agrees that money damages may not be an adequate remedy for any breach of the provisions of this Plan and that any party may in its sole discretion apply to any court of law or equity of competent jurisdiction
(without posting any bond or deposit) for specific performance and/or other injunctive relief in order to enforce or prevent any violations of the provisions of this Plan. 

16. Business Days. If any time period for giving notice or taking action hereunder expires on a day which is a Saturday, Sunday or
holiday in the state in which the Company’s chief executive office is located, the time period shall be automatically extended to the business day immediately following such Saturday, Sunday or holiday. 

17. Governing Law. All issues concerning this Plan will be governed by and construed in accordance with the laws of the State of
Delaware, without giving effect to any choice of law or conflict of law provision of rule (whether of the State of Delaware or any other jurisdiction) that would cause the application of the law of any jurisdiction other than the State of Delaware.
Each of the Company and each Participant submits to the co-exclusive jurisdiction of the United States District Court and any Delaware state court sitting in Wilmington, Delaware over any lawsuit under this
Plan and waives any objection based on venue or forum non conveniens with respect to any action instituted therein. Each of the Company and each Participant waives the necessity for personal service of any and all process upon it and consents
that all such service of process may be made by registered or certified mail (return receipt requested), in each case directed to such party in accordance with the notice requirements set forth in this Plan, and service so made will be deemed to be
completed on the date of actual receipt. Each of the Company and each Participant consents to service of process as aforesaid. Nothing in this Plan will prohibit personal service in lieu of the service by mail contemplated herein. 

18. Notices. Any notice required or permitted under this Plan or any agreement executed and delivered in connection with this Plan
shall be in writing and shall be either delivered by facsimile (which shall be effective upon receipt of confirmation of successful transmission), personally delivered, or mailed by first class mail, return receipt requested, to any Participant at
the address indicated in the Company’s records for such Person, and to the Company at the facsimile number and address below indicated: 

Notices to the Company: 

Integral Ad Science Holding Corp. 

c/o Vista Equity Partners Management, LLC 

Four Embarcadero Center, 20th Floor 

San Francisco, California 94111 

Facsimile: ************ 

Attention: David A. Breach and Michael Fosnaugh 

  
 9 

 With a copy to: 

Kirkland & Ellis LLP 

555 California Street, Suite 2900 

San Francisco, California 94104 

Facsimile: ************ 

Attention: Stuart E. Casillas, P.C. 
 or such
other facsimile number or address or to the attention of such other person as the recipient party shall have specified by prior written notice to the sending party. Any notice under this Plan shall be deemed to have been given when so delivered or
mailed. 
 * * * * * 

  
 10 

 EXHIBIT 1 

SPOUSAL CONSENT 
 The undersigned spouse
hereby acknowledges that I have read the following agreements to which my spouse is a party: 
 Integral Ad Science Holding Corp.
Amended & Restated 2018 Non-Qualified Stock 
 Option Plan; and 

Stock Option Agreement 
 and that
I understand their contents. I am aware that such agreements provide for the repurchase of certain of my spouse’s Common Stock of Integral Ad Science Holding Corp (the “Company”) under certain circumstances and impose other
restrictions on such Common Stock. I agree that my spouse’s interest in such Common Stock is subject to the agreements referred to above and the other agreements referred to therein and any interest I may have in such Common Stock shall be
irrevocably bound by these agreements and the other agreements referred to therein and further that my community property interest (if any) shall be similarly bound by these agreements. 

The undersigned spouse irrevocably constitutes and appoints ________________ (the “Unitholder”) as the undersigned’s
true and lawful attorney and proxy in the undersigned’s name, place and stead to sign, make, execute, acknowledge, deliver, file and record all documents which may be required, and to manage, vote, act and make all decisions with respect to
(whether necessary, incidental, convenient or otherwise), any and all Common Stock of the Company in which the undersigned now has or hereafter acquires any interest and in any and all Common Stock of the Company now or hereafter held of record by
the Unitholder (including but not limited to, the right, without further signature, consent or knowledge of the undersigned spouse, to exercise or not to exercise any and all options under any appropriate agreements and to exercise amendments and
modifications of and to terminate the foregoing agreements and to dispose of any and all such Common Stock and options), with all powers the undersigned spouse would possess if personally present, it being expressly understood and intended by the
undersigned that the foregoing power of attorney and proxy is coupled with an interest; and this power of attorney is a durable power of attorney and will not be affected by disability, incapacity or death of the Unitholder, or dissolution of
marriage and this proxy will not terminate without consent of the Unitholder and the Company. 
  

					
	Unitholder:	 		  	Spouse of Unitholder:
	  
	 		  	  

	Signature	 		  	Signature
	  
	 		  	  

	Printed Name	 		  	Printed Name
	  
	 		  	  

	Dated	 		  	Dated
		 		  	
	 SUBSCRIBED AND SWORN to
 before me this
____________ day
 of _____________, 20__
	 		  	
		 		  	My Commission Expires
	  
	 		  	  

 Notary Public

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