Grant Thornton (US) Company Cyber Security Posture
grantthornton.comForget what you think you know about professional services. We go beyond what’s expected and help others do the same. Grant Thornton is the brand name for Grant Thornton LLP and Grant Thornton Advisors LLC the U.S. member firms of Grant Thornton International Ltd, one of the world’s leading independent audit & assurance, tax and advisory firms. That means our network has more than 73,000 professionals in more than 146 countries who are ready to help public and private organizations of all sizes take on today’s challenges. But what sets us apart isn’t just what we do – it’s how we do it. Here, we believe in making business more personal and building trust into every result. We’re collaborators – obsessed with quality and ready for anything – who understand the value of strong relationships. It’s how we challenge the expectations of business and empower our people and clients to do it, too. One thing we won’t do? Grant Thornton will never request money or any form of payment for services via social media. Please report any concerns at 1-800-810-3503. Grant Thornton International Limited (GTIL) and the member firms, including Grant Thornton LLP and Grant Thornton Advisors LLC, are not a worldwide partnership. Services are delivered by the member firms. GTIL and its member firms are not agents of, and do not obligate, one another and are not liable for one another’s acts or omissions. Please see www.grantthornton.com for further details.
GT( Company Details
grant-thornton-us
11834 employees
570050.0
541
Accounting
grantthornton.com
Scan still pending
GRA_1064405
In-progress
GT( Risk Score (AI oriented)Between 900 and 1000
This score is AI-generated and less favored by cyber insurers, who prefer the TPRM score.
GT( Global Score.png)
Grant Thornton (US) Company Scoring based on AI Models
| Model Name | Date | Description | Current Score Difference | Score |
|---|---|---|---|---|
| AVERAGE-Industry | 03-12-2025 | This score represents the average cybersecurity rating of companies already scanned within the same industry. It provides a benchmark to compare an individual company's security posture against its industry peers. | N/A | Between 900 and 1000 |
Grant Thornton (US) Company Cyber Security News & History
| Entity | Type | Severity | Impact | Seen | Url ID | Details | View |
|---|---|---|---|---|---|---|---|
| Grant Thornton LLP | Breach | 60 | 3 | 4/2023 | GRA519072625 | Link | |
Rankiteo Explanation : Attack with significant impact with internal employee data leaksDescription: The California Office of the Attorney General reported a data breach involving Grant Thornton LLP on September 19, 2023. The breach occurred between April 19, 2023, and May 1, 2023, due to unauthorized access to an employee's email account, potentially affecting an unknown number of individuals, with names and additional unspecified personal information being involved. | |||||||
Grant Thornton (US) Company Subsidiaries
Forget what you think you know about professional services. We go beyond what’s expected and help others do the same. Grant Thornton is the brand name for Grant Thornton LLP and Grant Thornton Advisors LLC the U.S. member firms of Grant Thornton International Ltd, one of the world’s leading independent audit & assurance, tax and advisory firms. That means our network has more than 73,000 professionals in more than 146 countries who are ready to help public and private organizations of all sizes take on today’s challenges. But what sets us apart isn’t just what we do – it’s how we do it. Here, we believe in making business more personal and building trust into every result. We’re collaborators – obsessed with quality and ready for anything – who understand the value of strong relationships. It’s how we challenge the expectations of business and empower our people and clients to do it, too. One thing we won’t do? Grant Thornton will never request money or any form of payment for services via social media. Please report any concerns at 1-800-810-3503. Grant Thornton International Limited (GTIL) and the member firms, including Grant Thornton LLP and Grant Thornton Advisors LLC, are not a worldwide partnership. Services are delivered by the member firms. GTIL and its member firms are not agents of, and do not obligate, one another and are not liable for one another’s acts or omissions. Please see www.grantthornton.com for further details.
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Frequently Asked Questions
Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
GT( CyberSecurity History Information
How many cyber incidents has GT( faced?
Total Incidents: According to Rankiteo, GT( has faced 1 incident in the past.
What types of cybersecurity incidents have occurred at GT(?
Incident Types: The types of cybersecurity incidents that have occurred incident Breach.
Incident Details
Can you provide details on each incident?
Incident : Data Breach
Title: Grant Thornton LLP Data Breach
Description: Unauthorized access to an employee's email account, potentially affecting an unknown number of individuals, with names and additional unspecified personal information being involved.
Date Detected: 2023-09-19
Date Publicly Disclosed: 2023-09-19
Type: Data Breach
Attack Vector: Email Account Compromise
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 GRA519072625
Data Compromised: Names, Unspecified Personal Information
What types of data are most commonly compromised in incidents?
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Names and Unspecified Personal Information.
Which entities were affected by each incident?
Data Breach Information
What type of data was compromised in each breach?
Incident : Data Breach GRA519072625
Type of Data Compromised: Names, Unspecified Personal Information
Personally Identifiable Information: True
References
Where can I find more information about each incident?
Incident : Data Breach GRA519072625
Source: California Office of the Attorney General
Date Accessed: 2023-09-19
Where can stakeholders find additional resources on cybersecurity best practices?
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: California Office of the Attorney GeneralDate Accessed: 2023-09-19.
Additional Questions
Incident Details
What was the most recent incident detected?
Most Recent Incident Detected: The most recent incident detected was on 2023-09-19.
What was the most recent incident publicly disclosed?
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2023-09-19.
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 and Unspecified Personal Information.
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 Names and Unspecified Personal Information.
References
What is the most recent source of information about an incident?
Most Recent Source: The most recent source of information about an incident is California Office of the Attorney General.
What Do We Measure?
Every week, Rankiteo analyzes billions of signals to give organizations a sharper, faster view of emerging risks. With deeper, more actionable intelligence at their fingertips, security teams can outpace threat actors, respond instantly to Zero-Day attacks, and dramatically shrink their risk exposure window.
These are some of the factors we use to calculate the overall score:
Identify exposed access points, detect misconfigured SSL certificates, and uncover vulnerabilities across the network infrastructure.
Gain visibility into the software components used within an organization to detect vulnerabilities, manage risk, and ensure supply chain security.
Monitor and manage all IT assets and their configurations to ensure accurate, real-time visibility across the company's technology environment.
Leverage real-time insights on active threats, malware campaigns, and emerging vulnerabilities to proactively defend against evolving cyberattacks.
