SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

Integral Ad Science Holding Corp.

(Name of Issuer)

Common Stock, $0.001 par value per share

(Title of Class of Securities)

45828L108

(CUSIP Number)

12/23/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

Vista Equity Partners Fund VI, L.P.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

Vista Equity Partners Fund VI-A, L.P.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

VEPF VI FAF, L.P.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

Vista Equity Partners Fund VI GP, L.P.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

VEPF VI GP. Ltd.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

VEPF Management, L.P.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

Vista Equity Partners Management, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

VEP Group, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

45828L108

Names of Reporting Persons

Robert F. Smith

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

Integral Ad Science Holding Corp.

(b)

Address of issuer's principal executive offices:

12 E 49th Street, 20th Floor New York, NY 10017

Item 2.

(a)

Name of person filing:

This statement on Schedule 13G (this "Statement") is filed by the entities and persons listed below, each of whom is referred to herein as a "Reporting Person" and together as the "Reporting Persons": (i) Vista Equity Partners Fund VI, L.P. ("VEPF VI"); (ii) Vista Equity Partners Fund VI-A, L.P. ("VEPF VI-A"); (iii) VEPF VI FAF, L.P. ("FAF" and, together with the foregoing, the "Vista Funds"); (iv) Vista Equity Partners Fund VI GP, L.P. ("Fund VI GP"); (v) VEPF VI GP. Ltd. ("Fund VI UGP"); (vi) VEPF Management, L.P ("Management Company"); (vii) Vista Equity Partners Management, LLC ("VEPM"); (viii) VEP Group, LLC ("VEP Group" and, together with the foregoing, the "Vista Entities"); and (ix) Robert F. Smith.

(b)

Address or principal business office or, if none, residence:

The principal business address of each of the Vista Entities is 4 Embarcadero Center, 20th Fl., San Francisco, California 94111. The principal business address of Mr. Smith is c/o Vista Equity Partners, 401 Congress Drive, Suite 3100, Austin, Texas 78701.

(c)

Citizenship:

See responses to Item 4 on each cover page.

(d)

Title of class of securities:

Common Stock, $0.001 par value per share

(e)

CUSIP No.:

45828L108

Item 3.

If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);

(b)

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);

(c)

Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);

(d)

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);

(e)

An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f)

An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g)

A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h)

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:

(k)

Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

Item 4.

Ownership

(a)

Amount beneficially owned:

See responses to Item 9 on each cover page.

(b)

Percent of class:

See responses to Item 11 on each cover page.

(c)

Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote:

See responses to Item 5 on each cover page.

(ii) Shared power to vote or to direct the vote:

See responses to Item 6 on each cover page.

(iii) Sole power to dispose or to direct the disposition of:

See responses to Item 7 on each cover page.

(iv) Shared power to dispose or to direct the disposition of:

See responses to Item 8 on each cover page.

Item 5.

Ownership of 5 Percent or Less of a Class.

Ownership of 5 percent or less of a class

Item 6.

Ownership of more than 5 Percent on Behalf of Another Person.

Not Applicable

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not Applicable

Item 8.

Identification and Classification of Members of the Group.

Not Applicable

Item 9.

Notice of Dissolution of Group.

Not Applicable

Item 10.

Certifications:

Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Vista Equity Partners Fund VI, L.P.

Signature:	By: Vista Equity Partners Fund VI GP, L.P. / Its: General Partner, By: VEPF VI GP. Ltd. / Its: General Partner, By: /s/Robert F. Smith
Name/Title:	Robert F. Smith / Director
Date:	12/29/2025

Vista Equity Partners Fund VI-A, L.P.

Signature:	By: Vista Equity Partners Fund VI GP, L.P. / Its: General Partner, By: VEPF VI GP. Ltd. / Its: General Partner, By: /s/Robert F. Smith
Name/Title:	Robert F. Smith / Director
Date:	12/29/2025

VEPF VI FAF, L.P.

Signature:	By: Vista Equity Partners Fund VI GP, L.P. / Its: General Partner, By: VEPF VI GP. Ltd. / Its: General Partner, By: /s/Robert F. Smith
Name/Title:	Robert F. Smith / Director
Date:	12/29/2025

Vista Equity Partners Fund VI GP, L.P.

Signature:	By: VEPF VI GP. Ltd. / Its: General Partner, By: /s/ Robert F. Smith
Name/Title:	Robert F. Smith / Director
Date:	12/29/2025

VEPF VI GP. Ltd.

Signature:	/s/ Robert F. Smith
Name/Title:	Robert F. Smith / Director
Date:	12/29/2025

VEPF Management, L.P.

Signature:	By: VEP Group, LLC / Its: General Partner, By: /s/ Robert F. Smith
Name/Title:	Robert F. Smith / Managing Member
Date:	12/29/2025

Vista Equity Partners Management, LLC

Signature:	By: VEP Group, LLC / Its: Managing Member, By: /s/ Robert F. Smith
Name/Title:	Robert F. Smith / Managing member
Date:	12/29/2025

VEP Group, LLC

Signature:	/s/ Robert F. Smith
Name/Title:	Robert F. Smith / Managing Member
Date:	12/29/2025

Robert F. Smith

Signature:	/s/ Robert F. Smith
Name/Title:	Robert F. Smith
Date:	12/29/2025

Exhibit Information

Exhibit A Joint Filing Agreement, dated February 7, 2022, by and among the Reporting Persons (incorporated herein by reference to Exhibit A of the statement on Schedule 13G filed by the Reporting Persons on February 7, 2022).

Amendment: SEC Form SCHEDULE 13G/A filed by Integral Ad Science Holding Corp.