# EDGAR Filing Document

**Accession Number:** 0000806968
**File Stem:** 0001104659-26-056008
**Filing Date:** 2026-5
**Character Count:** 11643
**Document Hash:** 6797ceec13c2526ef216c9c645eb1c2e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-056008.hdr.sgml**: 20260506

**ACCESSION NUMBER**: 0001104659-26-056008

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260506

**DATE AS OF CHANGE**: 20260506

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** COMSCORE, INC.
- **CENTRAL INDEX KEY:** 0001158172
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-BUSINESS SERVICES, NEC [7389]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 541955550
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-83687
- **FILM NUMBER:** 26946542

**BUSINESS ADDRESS:**
- **STREET 1:** 11950 DEMOCRACY DRIVE
- **STREET 2:** SUITE 600
- **CITY:** RESTON
- **STATE:** VA
- **ZIP:** 20190
- **BUSINESS PHONE:** 703-438-2000

**MAIL ADDRESS:**
- **STREET 1:** 11950 DEMOCRACY DRIVE
- **STREET 2:** SUITE 600
- **CITY:** RESTON
- **STATE:** VA
- **ZIP:** 20190

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COMSCORE NETWORKS INC
- **DATE OF NAME CHANGE:** 20010827
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WPP plc
- **CENTRAL INDEX KEY:** 0000806968
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-ADVERTISING AGENCIES [7311]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 000000000
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** SEA CONTAINERS
- **STREET 2:** 18 UPPER GROUND
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** SE1 9GL
- **BUSINESS PHONE:** 440 20 7282 4600

**MAIL ADDRESS:**
- **STREET 1:** SEA CONTAINERS
- **STREET 2:** 18 UPPER GROUND
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** SE1 9GL

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WPP GROUP PLC
- **DATE OF NAME CHANGE:** 19960514

## Exhibit 99.1

**Annex A**

**Directors and Executive Officers of the Reporting Persons**

The name, citizenship, position, principal occupation or employment and business address of the directors and executive officers of each of the Reporting Persons are set forth below.

&nbsp;&nbsp;&nbsp;&nbsp;**1.** **CAVENDISH SQUARE HOLDING B.V.** 

---

| | | | |
|:---|:---|:---|:---|
| **Name and Citizenship** | **Position** | **Principal Occupation or Employment** | **Business Address** |
| Astrid van Heulen-Mulder<br> The Netherlands | Managing Director | Managing Director | Laan op Zuid 167, 3072 DB Rotterdam, The Netherlands |
| Walter Pouw<br> The Netherlands | Managing Director | Chief Financial Officer | Laan op Zuid 167, 3072 DB Rotterdam, The Netherlands |

---

&nbsp;&nbsp;&nbsp;&nbsp;**2.** **WPP** 

---

| | | | |
|:---|:---|:---|:---|
| **Name and Citizenship** | **Position** | **Principal Occupation or Employment** | **Business Address** |
| Philip Jansen<br>United Kingdom  | Chair | Chair | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |
| Cindy Rose OBE<br>United Kingdom; United States  | Chief Executive Officer | Group Chief Executive Officer | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL |
| Joanne Wilson<br>Ireland  | Chief Financial Officer | Group Chief Financial Officer | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |

---

---

| | | | |
|:---|:---|:---|:---|
| **Name and Citizenship** | **Position** | **Principal Occupation or Employment** | **Business Address** |
| Angela Ahrendts DBE<br>United Kingdom; United States  | Senior Independent Director, Non-Executive Director | Non-Executive Director | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |
| Simon Dingemans<br>United Kingdom  | Non-Executive Director | Non-Executive Director | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |
| Sandrine Dufour<br>France  | Non-Executive Director | Chief Financial Officer, UCB | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |
| Tom Ilube CBE<br>United Kingdom  | Non-Executive Director | Non-Executive Director | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |
| Keith Weed CBE<br>United Kingdom  | Non-Executive Director | Non-Executive Director | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |
| Jasmine Whitbread<br>United Kingdom; Switzerland  | Non-Executive Director | Non-Executive Director | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |
| Dr. Ya-Qin Zhang<br>United States  | Non-Executive Director | Non-Executive Director | WPP plc<br> Sea Containers,<br> 18 Upper Ground, London, United Kingdom, SE1 9GL  |

---

### UNITED STATES 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)*

**—**

*(CUSIP Number)*

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

*(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)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**CAVENDISH SQUARE HOLDING B.V.** | Name of reporting person<br>**CAVENDISH SQUARE HOLDING B.V.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**P7** | Citizenship or place of organization<br>**P7** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**565968.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**565968.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**565968.00** | Aggregate amount beneficially owned by each reporting person<br>**565968.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**3.8%** | Percent of class represented by amount in Row (11)<br>**3.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**WPP PLC** | Name of reporting person<br>**WPP PLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**Y9** | Citizenship or place of organization<br>**Y9** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**565968.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**565968.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**565968.00** | Aggregate amount beneficially owned by each reporting person<br>**565968.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**3.8%** | Percent of class represented by amount in Row (11)<br>**3.8%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**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, X0, SE1 9GL

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 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.

**(c)**
—

### 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.

**Reporting Person:** CAVENDISH SQUARE HOLDING B.V.

**Signature:** /s/ A. van Heulen-Mulder

**Name/Title:** A. van Heulen-Mulder/Managing Director

**Date:** 05/06/2026

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.

**Reporting Person:** WPP PLC

**Signature:** /s/ Balbir Kelly-Bisla

**Name/Title:** Balbir Kelly-Bisla/Company Secretary

**Date:** 05/06/2026