dentsu
Company Details
Linkedin ID:
dentsu
Website:
Employees number:
19,142
Number of followers:
1,701,378
NAICS:
541613
Industry Type:
Homepage:
bit.ly
IP Addresses:
159
Company ID:
DEN_1102532
Scan Status:
Completed
dentsu Company CyberSecurity Posture
bit.ly
We are dentsu. We team together to help brands predict and plan for disruptive future opportunities and create new paths to growth in the sustainable economy. We know people better than anyone else and we use those insights to connect brand, content, commerce and experience, underpinned by modern creativity. We are the network designed for what’s next.
dentsu A.I CyberSecurity Scoring
dentsu Risk Score (AI oriented)Between 650 and 699
dentsu
Updated:
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dentsu Global Score (TPRM)XXXX
dentsu
- Instant access to detailed risk factors
- Benchmark vs. industry & size peers
- Vulnerabilities
- Findings
dentsu Company CyberSecurity News & History
Past Incidents
2
Attack Types
1
Dentsu (via Merkle’s network)
Breach
Rankiteo Explanation
Attack with significant impact with internal employee data leaks
Description: Dentsu, a global advertising and media network, suffered a security breach within its subsidiary Merkle’s network, resulting in the theft of sensitive files. The compromised data included personal and financial details of current and former employees, as well as some clients and suppliers. Exposed information comprised names, bank/payroll details, salaries, National Insurance numbers, and personal contact details.The company detected unusual network activity, triggering an immediate response: systems were taken offline, incident response protocols were activated, and third-party cybersecurity firms alongside law enforcement were engaged. While Dentsu restored operations, the investigation remains ongoing. Affected individuals were notified and offered credit/dark-web monitoring services via Experian Identity Plus to mitigate risks like identity theft or financial fraud.The breach coincides with Dentsu’s strategic review, including potential divestments of its international creative and media divisions, raising concerns about operational stability. The incident underscores vulnerabilities in handling highly sensitive employee and client data, with potential long-term reputational and financial repercussions.
Dentsu
Breach
Rankiteo Explanation
Attack with significant impact with internal employee data leaks
Description: Dentsu, a global advertising and marketing agency, suffered a significant data breach affecting its CX agency, Merkle. The incident involved unauthorized access to files containing sensitive personal and financial data of current and former employees, including bank/payroll details, salaries, National Insurance numbers, and contact information. The breach also extended to LNER (London North Eastern Railway) customer data, exposing contact details and journey histories, though no payment or password data was compromised. The breach triggered a complaint to the UK’s Information Commissioner’s Office (ICO), with affected ex-employees forming legal groups (one WhatsApp group exceeding 150 members) to pursue collective action. Dentsu acknowledged the leak exceeded legal reporting thresholds and offered affected individuals a year of Experian Identity Plus for monitoring. However, frustration persists over delayed notifications, unclear specifics of leaked data, and Dentsu’s retention of records beyond standard HMRC timelines (some ex-employees left over a decade ago). The ICO may impose fines (up to £8.7M or 2% of global turnover) if negligence is proven, separate from potential compensation claims.
dentsu Company Scoring based on AI Models
Cyber Incidents Likelihood 3 - 6 - 9 months
A.I Risk Score Likelihood 3 - 6 - 9 months
Underwriter Stats for dentsu
Incidents vs Advertising Services Industry Average (This Year)
No incidents recorded for dentsu in 2026.
Incidents vs All-Companies Average (This Year)
No incidents recorded for dentsu in 2026.
Incident Types dentsu vs Advertising Services Industry Avg (This Year)
No incidents recorded for dentsu in 2026.
Incident History — dentsu (X = Date, Y = Severity)
dentsu cyber incidents detection timeline including parent company and subsidiaries
dentsu Company Subsidiaries
We are dentsu. We team together to help brands predict and plan for disruptive future opportunities and create new paths to growth in the sustainable economy. We know people better than anyone else and we use those insights to connect brand, content, commerce and experience, underpinned by modern creativity. We are the network designed for what’s next.
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dentsu CyberSecurity News
December 18, 2025 08:35 AM
Attain Integrates With dentsu.Connect Platform
Attain partners with dentsu to power dentsu.Connect with real-time, verified purchase data, enabling more accurate, outcome-driven activation.
November 26, 2025 08:00 AM
Dentsu’s UK data breach sparks employee-led legal push
At least one WhatsApp group now counts more than 150 ex‑employees discussing collective legal options, and a “Join the Claim” portal has...
November 24, 2025 08:00 AM
‘Adland is not prepared for cyber attacks’ warns former agency chief
Dentsu is the latest large organisation to face a major cyber attack, following Jaguar Land Rover, M&S and the Co-op.
November 22, 2025 08:00 AM
Dentsu Confirms Major Data Breach At Merkle, Exposing Sensitive Employee Information
Dentsu has confirmed a cybersecurity incident affecting its data-driven marketing arm Merkle, after detecting suspicious activity within the...
November 21, 2025 08:00 AM
More than 150 ex-Dentsu employees plan legal action for data breach
Former Dentsu staff say they were never contacted after the breach and are unsure what personal information was leaked or why it was still...
November 14, 2025 08:00 AM
Crayola’s 'Blue Christmas' Reimagines Holiday Magic Through Inclusive Creativity
Crayola's Blue Christmas campaign with Dentsu Creative reimagines the holidays through inclusive storytelling and family-focused creativity.
November 14, 2025 08:00 AM
Subway Turns Its Holiday Campaign Into a Reminder That Food Connects People
Subway Canada teams with Dentsu Creative Canada for a national holiday campaign featuring "Festive Faves Meals."
November 11, 2025 08:00 AM
Dentsu leak compromised LNER customer data
Dentsu's data breach has compromised LNER'S customer data. Campaign reported in late October that former, current and “some clients” at...
November 11, 2025 08:00 AM
Digitas and Dentsu X notch gains as Initiative holds lead in November US rankings
iProspect and Hearts & Science join the agency table.. From Campaign US.
Frequently Asked Questions
Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
dentsu CyberSecurity History Information
Official Website of dentsu
The official website of dentsu is https://bit.ly/3lDa6Ff.
dentsu’s AI-Generated Cybersecurity Score
According to Rankiteo, dentsu’s AI-generated cybersecurity score is 666, reflecting their Weak security posture.
How many security badges does dentsu’ have ?
According to Rankiteo, dentsu currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
Has dentsu been affected by any supply chain cyber incidents ?
According to Rankiteo, dentsu has not been affected by any supply chain cyber incidents, and no incident IDs are currently listed for the organization.
Does dentsu have SOC 2 Type 1 certification ?
According to Rankiteo, dentsu is not certified under SOC 2 Type 1.
Does dentsu have SOC 2 Type 2 certification ?
According to Rankiteo, dentsu does not hold a SOC 2 Type 2 certification.
Does dentsu comply with GDPR ?
According to Rankiteo, dentsu is not listed as GDPR compliant.
Does dentsu have PCI DSS certification ?
According to Rankiteo, dentsu does not currently maintain PCI DSS compliance.
Does dentsu comply with HIPAA ?
According to Rankiteo, dentsu is not compliant with HIPAA regulations.
Does dentsu have ISO 27001 certification ?
According to Rankiteo,dentsu is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Industry Classification of dentsu
dentsu operates primarily in the Advertising Services industry.
Number of Employees at dentsu
dentsu employs approximately 19,142 people worldwide.
Subsidiaries Owned by dentsu
dentsu presently has no subsidiaries across any sectors.
dentsu’s LinkedIn Followers
dentsu’s official LinkedIn profile has approximately 1,701,378 followers.
NAICS Classification of dentsu
dentsu is classified under the NAICS code 541613, which corresponds to Marketing Consulting Services.
dentsu’s Presence on Crunchbase
No, dentsu does not have a profile on Crunchbase.
dentsu’s Presence on LinkedIn
Yes, dentsu maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/dentsu.
Cybersecurity Incidents Involving dentsu
As of January 24, 2026, Rankiteo reports that dentsu has experienced 2 cybersecurity incidents.
Number of Peer and Competitor Companies
dentsu has an estimated 32,770 peer or competitor companies worldwide.
What types of cybersecurity incidents have occurred at dentsu ?
Incident Types: The types of cybersecurity incidents that have occurred include Breach.
How does dentsu detect and respond to cybersecurity incidents ?
Detection and Response: The company detects and responds to cybersecurity incidents through an third party assistance with cybersecurity firm (unnamed), third party assistance with experian identity plus (for monitoring services), and and containment measures with systems taken offline, containment measures with incident response protocols initiated, and recovery measures with systems brought back online, and communication strategy with internal email to employees, communication strategy with public statement, communication strategy with notification process for affected parties, and and third party assistance with cybersecurity firm (unnamed), and and remediation measures with offered experian identity plus (1-year subscription for credit/dark-web monitoring), and communication strategy with initial notification to affected individuals (27 oct 2023), communication strategy with encouraged monitoring of financial statements, communication strategy with no further updates provided, and enhanced monitoring with fraud monitoring recommended for affected individuals..
Incident Details
Can you provide details on each incident ?
Title: Data Breach at Dentsu's Merkle Network Affecting Employees, Clients, and Suppliers
Description: Former and current staff at Dentsu and some clients had their information taken following a security incident within Merkle’s network. Files containing names, bank and payroll details, salary, National Insurance numbers, and personal contact details were exfiltrated. Dentsu has engaged third-party cybersecurity firms, notified law enforcement, and offered affected individuals credit and dark-web monitoring services via Experian Identity Plus. The investigation remains ongoing, but notifications have begun in compliance with applicable laws.
Type: data breach
Title: Dentsu Data Breach Affecting Former Employees and LNER Customers
Description: Dentsu reported a data breach where files containing personal and financial details of former employees (including bank/payroll details, salary, National Insurance numbers, and contact details) were exfiltrated from Merkle’s network. The breach also impacted LNER customer data, including contact details and journey information. The ICO is investigating, and affected individuals are considering legal action. Dentsu offered credit monitoring services and notified law enforcement.
Date Publicly Disclosed: 2023-10-27
Type: Data Breach
What are the most common types of attacks the company has faced ?
Common Attack Types: The most common types of attacks the company has faced is Breach.
Impact of the Incidents
What was the impact of each incident ?
Incident : data breach DEN1492114110225
Data Compromised: Names, Bank details, Payroll details, Salary information, National insurance numbers, Personal contact details
Systems Affected: portion of Merkle’s network
Downtime: temporary (some systems taken offline as precaution)
Operational Impact: minimal (fully operational after containment)
Brand Reputation Impact: potential (ongoing investigation amid speculation about Dentsu's future)
Identity Theft Risk: high (bank, payroll, and PII exposed)
Payment Information Risk: high (bank details compromised)
Incident : Data Breach DEN0962609112125
Data Compromised: Bank/payroll details, Salary information, National insurance numbers, Personal contact details, Lner customer contact details, Lner journey information
Systems Affected: Merkle’s (Dentsu’s CX agency) network
Customer Complaints: ['Collective legal action being considered by former employees', 'Frustration over lack of follow-up communication', 'Complaints about prolonged data retention (10+ years)']
Brand Reputation Impact: Potential reputational damage due to legal action and regulatory scrutinyNegative media coverage
Legal Liabilities: Potential ICO fines (up to £8.7M or 2% of global turnover)Group action claims by former employeesViolation of UK GDPR and Data Protection Act 2018 (excessive data retention)
Identity Theft Risk: ['High (due to exposure of National Insurance numbers, bank details, and personal contact information)']
Payment Information Risk: ['Exposed for former employees (bank/payroll details)', 'Not affected for LNER customers']
What types of data are most commonly compromised in incidents ?
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Personal Identifiable Information (Pii), Financial Data, Employment Records, , Personal Identifiable Information (Pii), Financial Data, Employment Records, Customer Contact Details, Journey Information and .
Which entities were affected by each incident ?
Incident : data breach DEN1492114110225
Entity Name: Dentsu (via Merkle network)
Entity Type: advertising and marketing agency
Industry: media and communications
Customers Affected: some clients, suppliers, and current/former employees
Incident : Data Breach DEN0962609112125
Entity Name: Dentsu (including Merkle CX agency)
Entity Type: Advertising/Media Conglomerate
Industry: Marketing & Advertising
Location: United KingdomJapan (HQ)
Customers Affected: Current/former employees (150+ in one WhatsApp group), Clients, Suppliers
Incident : Data Breach DEN0962609112125
Entity Name: London North Eastern Railway (LNER)
Entity Type: Train Operator
Industry: Transportation
Location: United Kingdom
Customers Affected: Unknown (contact details and journey information exposed)
Response to the Incidents
What measures were taken in response to each incident ?
Incident : data breach DEN1492114110225
Incident Response Plan Activated: True
Third Party Assistance: Cybersecurity Firm (Unnamed), Experian Identity Plus (For Monitoring Services).
Containment Measures: systems taken offlineincident response protocols initiated
Recovery Measures: systems brought back online
Communication Strategy: internal email to employeespublic statementnotification process for affected parties
Incident : Data Breach DEN0962609112125
Incident Response Plan Activated: True
Third Party Assistance: Cybersecurity Firm (Unnamed).
Remediation Measures: Offered Experian Identity Plus (1-year subscription for credit/dark-web monitoring)
Communication Strategy: Initial notification to affected individuals (27 Oct 2023)Encouraged monitoring of financial statementsNo further updates provided
Enhanced Monitoring: Fraud monitoring recommended for affected individuals
How does the company involve third-party assistance in incident response ?
Third-Party Assistance: The company involves third-party assistance in incident response through cybersecurity firm (unnamed), Experian Identity Plus (for monitoring services), , Cybersecurity firm (unnamed), .
Data Breach Information
What type of data was compromised in each breach ?
Incident : data breach DEN1492114110225
Type of Data Compromised: Personal identifiable information (pii), Financial data, Employment records
Sensitivity of Data: high (includes bank details, National Insurance numbers, and salary information)
Personally Identifiable Information: namesNational Insurance numberspersonal contact details
Incident : Data Breach DEN0962609112125
Type of Data Compromised: Personal identifiable information (pii), Financial data, Employment records, Customer contact details, Journey information
Sensitivity of Data: High (includes National Insurance numbers, bank details, salaries)
Personally Identifiable Information: NamesNational Insurance numbersBank/payroll detailsSalariesPersonal contact details (email/phone/address)
What measures does the company take to prevent data exfiltration ?
Prevention of Data Exfiltration: The company takes the following measures to prevent data exfiltration: Offered Experian Identity Plus (1-year subscription for credit/dark-web monitoring), .
How does the company handle incidents involving personally identifiable information (PII) ?
Handling of PII Incidents: The company handles incidents involving personally identifiable information (PII) through by systems taken offline, incident response protocols initiated and .
Ransomware Information
Was ransomware involved in any of the incidents ?
Incident : data breach DEN1492114110225
Data Exfiltration: True
Incident : Data Breach DEN0962609112125
Data Exfiltration: True
How does the company recover data encrypted by ransomware ?
Data Recovery from Ransomware: The company recovers data encrypted by ransomware through systems brought back online, .
Regulatory Compliance
Were there any regulatory violations and fines imposed for each incident ?
Incident : data breach DEN1492114110225
Regulatory Notifications: ongoing (notifications begun in accordance with applicable law)
Incident : Data Breach DEN0962609112125
Regulations Violated: UK GDPR, Data Protection Act 2018 (excessive data retention beyond 7 years),
Legal Actions: ICO investigation ongoing, Potential group action claims by former employees,
Regulatory Notifications: Reported to ICO (scale exceeded legal threshold)Law enforcement notified
How does the company ensure compliance with regulatory requirements ?
Ensuring Regulatory Compliance: The company ensures compliance with regulatory requirements through ICO investigation ongoing, Potential group action claims by former employees, .
Lessons Learned and Recommendations
What recommendations were made to prevent future incidents ?
Incident : data breach DEN1492114110225
Recommendations: monitor financial statements, use credit/dark-web monitoring services (e.g., Experian Identity Plus)monitor financial statements, use credit/dark-web monitoring services (e.g., Experian Identity Plus)
Incident : Data Breach DEN0962609112125
Recommendations: Improve data retention policies to comply with UK GDPR (max 7 years for HMRC-related records), Enhance transparency in post-breach communication (e.g., clarify which specific data was exposed per individual), Proactively engage with affected parties to mitigate legal risks, Review third-party supplier security (LNER breach linked to Dentsu’s systems)Improve data retention policies to comply with UK GDPR (max 7 years for HMRC-related records), Enhance transparency in post-breach communication (e.g., clarify which specific data was exposed per individual), Proactively engage with affected parties to mitigate legal risks, Review third-party supplier security (LNER breach linked to Dentsu’s systems)Improve data retention policies to comply with UK GDPR (max 7 years for HMRC-related records), Enhance transparency in post-breach communication (e.g., clarify which specific data was exposed per individual), Proactively engage with affected parties to mitigate legal risks, Review third-party supplier security (LNER breach linked to Dentsu’s systems)Improve data retention policies to comply with UK GDPR (max 7 years for HMRC-related records), Enhance transparency in post-breach communication (e.g., clarify which specific data was exposed per individual), Proactively engage with affected parties to mitigate legal risks, Review third-party supplier security (LNER breach linked to Dentsu’s systems)
References
Where can I find more information about each incident ?
Incident : data breach DEN1492114110225
Source: Campaign (marketing industry publication)
Incident : Data Breach DEN0962609112125
Source: Campaign UK
Incident : Data Breach DEN0962609112125
Source: Information Commissioner’s Office (ICO) Statement
Incident : Data Breach DEN0962609112125
Source: Withers Law Firm (Jo Sanders, Data/Information Disputes Partner)
Where can stakeholders find additional resources on cybersecurity best practices ?
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: Campaign (marketing industry publication), and Source: Campaign UK, and Source: Information Commissioner’s Office (ICO) Statement, and Source: Withers Law Firm (Jo Sanders, Data/Information Disputes Partner).
Investigation Status
What is the current status of the investigation for each incident ?
Incident : data breach DEN1492114110225
Investigation Status: ongoing
Incident : Data Breach DEN0962609112125
Investigation Status: Ongoing (ICO inquiry and internal investigation with cybersecurity firm)
How does the company communicate the status of incident investigations to stakeholders ?
Communication of Investigation Status: The company communicates the status of incident investigations to stakeholders through Internal Email To Employees, Public Statement, Notification Process For Affected Parties, Initial Notification To Affected Individuals (27 Oct 2023), Encouraged Monitoring Of Financial Statements and No Further Updates Provided.
Stakeholder and Customer Advisories
Were there any advisories issued to stakeholders or customers for each incident ?
Incident : data breach DEN1492114110225
Stakeholder Advisories: Internal Email To Employees, Public Statement.
Customer Advisories: encouraged to monitor financial statementsoffered Experian Identity Plus subscription
Incident : Data Breach DEN0962609112125
Customer Advisories: Dentsu: Monitor financial statements; offered Experian Identity Plus.LNER: No bank/payment card/password data affected; investigation underway.
What advisories does the company provide to stakeholders and customers following an incident ?
Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were Internal Email To Employees, Public Statement, Encouraged To Monitor Financial Statements, Offered Experian Identity Plus Subscription, , Dentsu: Monitor Financial Statements; Offered Experian Identity Plus., Lner: No Bank/Payment Card/Password Data Affected; Investigation Underway. and .
Initial Access Broker
How did the initial access broker gain entry for each incident ?
Incident : data breach DEN1492114110225
High Value Targets: Employee Data, Client/Supplier Data,
Data Sold on Dark Web: Employee Data, Client/Supplier Data,
Incident : Data Breach DEN0962609112125
High Value Targets: Employee Pii/Financial Data, Client/Supplier Data,
Data Sold on Dark Web: Employee Pii/Financial Data, Client/Supplier Data,
Post-Incident Analysis
What were the root causes and corrective actions taken for each incident ?
Incident : Data Breach DEN0962609112125
Root Causes: Inadequate Data Retention Policies (Retained Data For 10+ Years Beyond Legal Limits), Potential Third-Party Security Vulnerabilities (Merkle’S Network),
What is the company's process for conducting post-incident analysis ?
Post-Incident Analysis Process: The company's process for conducting post-incident analysis is described as Cybersecurity Firm (Unnamed), Experian Identity Plus (For Monitoring Services), , Cybersecurity Firm (Unnamed), , Fraud Monitoring Recommended For Affected Individuals, .
Additional Questions
Incident Details
What was the most recent incident publicly disclosed ?
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2023-10-27.
Impact of the Incidents
What was the most significant data compromised in an incident ?
Most Significant Data Compromised: The most significant data compromised in an incident were names, bank details, payroll details, salary information, National Insurance numbers, personal contact details, , Bank/payroll details, Salary information, National Insurance numbers, Personal contact details, LNER customer contact details, LNER journey information and .
What was the most significant system affected in an incident ?
Most Significant System Affected: The most significant system affected in an incident was portion of Merkle’s network and Merkle’s (Dentsu’s CX agency) network.
Response to the Incidents
What third-party assistance was involved in the most recent incident ?
Third-Party Assistance in Most Recent Incident: The third-party assistance involved in the most recent incident was cybersecurity firm (unnamed), experian identity plus (for monitoring services), , cybersecurity firm (unnamed), .
What containment measures were taken in the most recent incident ?
Containment Measures in Most Recent Incident: The containment measures taken in the most recent incident was systems taken offlineincident response protocols initiated.
Data Breach Information
What was the most sensitive data compromised in a breach ?
Most Sensitive Data Compromised: The most sensitive data compromised in a breach were LNER journey information, Bank/payroll details, National Insurance numbers, Personal contact details, Salary information, bank details, payroll details, personal contact details, LNER customer contact details, names and salary information.
Regulatory Compliance
What was the most significant legal action taken for a regulatory violation ?
Most Significant Legal Action: The most significant legal action taken for a regulatory violation was ICO investigation ongoing, Potential group action claims by former employees, .
Lessons Learned and Recommendations
What was the most significant recommendation implemented to improve cybersecurity ?
Most Significant Recommendation Implemented: The most significant recommendation implemented to improve cybersecurity was Enhance transparency in post-breach communication (e.g., clarify which specific data was exposed per individual), monitor financial statements, Proactively engage with affected parties to mitigate legal risks, use credit/dark-web monitoring services (e.g., Experian Identity Plus), Review third-party supplier security (LNER breach linked to Dentsu’s systems) and Improve data retention policies to comply with UK GDPR (max 7 years for HMRC-related records).
References
What is the most recent source of information about an incident ?
Most Recent Source: The most recent source of information about an incident are Campaign (marketing industry publication), Campaign UK, Withers Law Firm (Jo Sanders, Data/Information Disputes Partner) and Information Commissioner’s Office (ICO) Statement.
Investigation Status
What is the current status of the most recent investigation ?
Current Status of Most Recent Investigation: The current status of the most recent investigation is ongoing.
Stakeholder and Customer Advisories
What was the most recent stakeholder advisory issued ?
Most Recent Stakeholder Advisory: The most recent stakeholder advisory issued was internal email to employees, public statement, .
What was the most recent customer advisory issued ?
Most Recent Customer Advisory: The most recent customer advisory issued were an encouraged to monitor financial statementsoffered Experian Identity Plus subscription and Dentsu: Monitor financial statements; offered Experian Identity Plus.LNER: No bank/payment card/password data affected; investigation underway.
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Monitor and manage all IT assets and their configurations to ensure accurate, real-time visibility across the company's technology environment.
Threat Intelligence
Leverage real-time insights on active threats, malware campaigns, and emerging vulnerabilities to proactively defend against evolving cyberattacks.
Rankiteo is a unified scoring and risk platform that analyzes billions of signals weekly to help organizations gain faster, more actionable insights into emerging threats. Empowering teams to outpace adversaries and reduce exposure.
