WPP updates comScore stake to 3.8% ownership

Rhea-AI Filing Summary

WPP plc and its subsidiary Cavendish Square Holding B.V. filed Amendment No. 7 to their Schedule 13D on comScore, Inc. They report beneficial ownership of 565,968 shares of comScore common stock, representing about 3.8% of outstanding shares based on 15,023,514 shares outstanding on March 16, 2026.

The filing notes the reporting persons ceased to be beneficial owners of more than five percent of comScore’s stock on December 29, 2025, solely because the total number of comScore shares outstanding increased. Cavendish and WPP are deemed to share voting and dispositive power over these shares, and Cavendish formally disclaims beneficial ownership.

Insights

Equity ownership & disclosure analyst

WPP’s comScore stake is now 3.8%, below the 5% major-holder threshold.

WPP plc and subsidiary Cavendish Square Holding B.V. report beneficial ownership of 565,968 comScore shares, or 3.8% of outstanding stock. The drop below five percent on December 29, 2025 resulted from an increase in comScore’s total shares, not from reported sales.

Falling under the five percent level reduces their status as a major holder, though they still retain a meaningful position. Both entities may be deemed to share voting and dispositive power over the stake, while Cavendish formally disclaims beneficial ownership, reflecting a conservative legal stance on control and economic interest.

Key Figures

Beneficially owned shares: 565,968 shares Ownership percentage: 3.8% Shares outstanding: 15,023,514 shares +3 more

6 metrics

Beneficially owned shares 565,968 shares Cavendish and WPP plc beneficial ownership as of Amendment No. 7

Ownership percentage 3.8% Portion of comScore common stock outstanding represented by 565,968 shares

Shares outstanding 15,023,514 shares ComScore common stock outstanding as of March 16, 2026 per Form 10-K

Date fell below 5% December 29, 2025 Date reporting persons ceased to own over five percent of comScore

Shared voting power 565,968 shares Shares over which Cavendish and WPP plc may be deemed to share voting power

Shared dispositive power 565,968 shares Shares over which Cavendish and WPP plc may be deemed to share dispositive power

Key Terms

beneficially own, Schedule 13D, shared power to vote, dispositive power, +1 more

5 terms

beneficially own financial

"Cavendish is deemed to beneficially own an aggregate of 565,968 shares of Common Stock"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

Schedule 13D regulatory

"This Amendment No. 7 relates to the filed by Cavendish Square Holding B.V. ... with the Securities and Exchange Commission"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

shared power to vote financial

"Each of Cavendish and WPP plc may be deemed to have shared power to vote"

dispositive power financial

"shared power to vote and dispose or direct the vote and direct the disposition of the Shares"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

beneficial owners of more than five percent regulatory

"The Reporting Persons ceased to be beneficial owners of more than five percent of the Company's outstanding Common Stock"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many comScore (SCOR) shares do WPP plc and Cavendish currently report owning?

WPP plc and Cavendish Square Holding B.V. report beneficial ownership of 565,968 shares of comScore common stock. This stake represents about 3.8% of comScore’s outstanding shares, based on 15,023,514 shares outstanding as of March 16, 2026, referenced in the filing.

What percentage of comScore (SCOR) does WPP plc’s group currently own?

The reporting persons state they beneficially own approximately 3.8% of comScore’s outstanding common stock. This percentage is calculated using 15,023,514 shares outstanding as of March 16, 2026, as disclosed in comScore’s Annual Report on Form 10-K cited in the Schedule 13D amendment.

When did WPP and Cavendish fall below 5% ownership of comScore (SCOR)?

The filing states the reporting persons ceased to be beneficial owners of more than five percent of comScore’s outstanding common stock on December 29, 2025. This change occurred solely because the aggregate number of comScore shares outstanding increased on that date, reducing their ownership percentage.

Do WPP plc and Cavendish have voting and dispositive power over their comScore (SCOR) shares?

Yes. The amendment explains that both Cavendish and WPP plc may be deemed to share power to vote and dispose, or direct the vote and disposition, of the 565,968 comScore shares. This reflects shared voting and investment authority over the reported position.

Why does Cavendish disclaim beneficial ownership of comScore (SCOR) shares it reports?

Although Cavendish is deemed to beneficially own 565,968 comScore shares for reporting purposes, it expressly disclaims beneficial ownership in the filing. Such disclaimers are common when entities want to limit assertions about ultimate economic interest or control, while still complying with disclosure rules.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/06/2026 - 10:59 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 7)

COMSCORE, INC.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

20564W105

(CUSIP Number)

Andrea Harris, GCC
WPP plc, Sea Containers, 18 Upper Ground
London, X0, SE1 9GL
44 20 7282 4600

Curt Myers, Esq.
Davis + Gilbert LLP, 1675 Broadway
New York, NY, 10019
(212) 468-4800

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

12/29/2025

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 20564W105

1

Name of reporting person

CAVENDISH SQUARE HOLDING B.V.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

NETHERLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 565,968.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 565,968.00

11

Aggregate amount beneficially owned by each reporting person

565,968.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

3.8 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP Number(s): 20564W105

1

Name of reporting person

WPP PLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

JERSEY

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 565,968.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 565,968.00

11

Aggregate amount beneficially owned by each reporting person

565,968.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

3.8 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.001 per share
(b)	Name of Issuer: COMSCORE, INC.
(c)	Address of Issuer's Principal Executive Offices: Sea Containers, 18 Upper Ground, London, UNITED KINGDOM , SE1 9GL.
Item 1 Comment: This Amendment No. 7 relates to the Schedule 13D filed by Cavendish Square Holding B.V., a private limited liability company incorporated under the laws of the Netherlands ("Cavendish"), and WPP plc, a public limited company formed under the laws of Jersey, with the Securities and Exchange Commission on April 7, 2015, as amended (the "Schedule 13D"), relating to the common stock, par value $0.001 per share (the "Common Stock"), of comScore, Inc., a Delaware corporation (the "Company"). Unless set forth below, all Items are unchanged from the Schedule 13D. Capitalized terms used herein and not otherwise defined herein shall have the meanings ascribed to such terms in the Schedule 13D.
Item 2.	Identity and Background
(a)	This Schedule 13D is being filed by Cavendish and WPP plc, a public limited company formed under the laws of Jersey. WPP plc indirectly holds 100% of the outstanding stock of Cavendish through a series of intervening holding companies. Cavendish and WPP plc are sometimes referred to herein collectively as the "Reporting Persons" and individually as a "Reporting Person."
(b)	The address of the principal office of Cavendish is Laan op Zuid 167, 3072 DB Rotterdam, the Netherlands. The address of the principal office of WPP plc is Sea Containers, 18 Upper Ground, London, United Kingdom, SE1 9GL.
(c)	The organizational structure of WPP plc and its subsidiaries (the "WPP Group") brings together media intelligence, data solutions, creative services, production capabilities, enterprise solutions and strategic counsel on a national, multinational and global scale.
(d)	During the past five years, neither of the Reporting Persons nor, to the knowledge of the Reporting Persons, any of their respective executive officers or directors, has been convicted in a criminal proceeding (excluding traffic violations and similar misdemeanors).
(e)	During the past five years, neither of the Reporting Persons nor, to the knowledge of the Reporting Persons, any of their respective executive officers or directors, has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which such person was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.
(f)	The name, citizenship, business address, principal business occupation or employment of the directors and executive officers of each of the Reporting Persons are set forth on Annex A hereto.
Item 5.	Interest in Securities of the Issuer
(a)	As of the date of this Amendment No. 7, Cavendish is deemed to beneficially own an aggregate of 565,968 shares of Common Stock (the "Shares"), representing approximately 3.8% of the Company's outstanding Common Stock, based upon disclosure in the Company's Annual Report on Form 10-K, filed on March 26, 2026, that there were 15,023,514 shares of Common Stock outstanding on March 16, 2026. WPP plc indirectly owns 100% of Cavendish and therefore may be deemed to have beneficial ownership of the Shares. Cavendish disclaims beneficial ownership of the Shares.
(b)	Each of Cavendish and WPP plc may be deemed to have shared power to vote and dispose or direct the vote and direct the disposition of the Shares.
(e)	The Reporting Persons ceased to be beneficial owners of more than five percent of the Company's outstanding Common Stock on December 29, 2025, solely as a result of an increase in the aggregate amount of shares of Common Stock outstanding on that date.

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.

CAVENDISH SQUARE HOLDING B.V.

Signature:	/s/ A. van Heulen-Mulder
Name/Title:	A. van Heulen-Mulder/Managing Director
Date:	05/06/2026

WPP PLC

Signature:	/s/ Balbir Kelly-Bisla
Name/Title:	Balbir Kelly-Bisla/Company Secretary
Date:	05/06/2026