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Grant Thornton (US)

Grant Thornton (US) Vendor Cyber Rating & Cyber Score

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In the US, Grant Thornton LLP and Grant Thornton Advisors LLC (and their respective subsidiary entities) practice as an alternative practice structure in accordance with the AICPA Code of Professional Conduct and applicable law, regulations and professional standards. Grant Thornton LLP is a licensed independent CPA firm that provides attest services to its clients, and Grant Thornton Advisors LLC and its subsidiary entities provide tax and business consulting services to their clients. Grant Thornton Advisors LLC and its subsidiary entities are not licensed CPA firms. With a unified, local presence across several countries – including the U.S., Ireland, and others, our platform represents a community of 18,000+ problem solvers,


GT A.I CyberSecurity Scoring

Incident Details
GT
Company Information
Website:https://gt-us.co/3LukwpC
Employees number:11,632
Number of followers:608,989
NAICS:54
Industry Type:Professional Services
Homepage:gt-us.co
Cyber Premium EstimationGet Supply Chain
GT Risk Score (AI oriented)
Between 750 and 799
logo
GTProfessional Services
Updated:
02/04/2026
765/1000
Fair
Baa
AaaAaABaaBaBCaaCaC
Powered by our proprietary A.I cyber incident model
✖ Insurance prefers TPRM score to calculate premium
GT Global Score (TPRM)
xxxx
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GTProfessional Services
•••
Score locked
Instant access to detailed risk factors
Vulnerabilities
Benchmark vs. industry & size peers
Findings

GT
GTFair
Current Score
765Baa (FAIR)
01000
1 incidents
0 avg impact
Incident timeline with MITRE ATT&CK tactics, techniques, and mitigations.
JULY 2026
766Before Incident
JUNE 2026
766Before Incident
MAY 2026
765Before Incident
APRIL 2026
765Before Incident
MARCH 2026
765Before Incident
FEBRUARY 2026
764Before Incident
JANUARY 2026
764Before Incident
DECEMBER 2025
764Before Incident
NOVEMBER 2025
763Before Incident
OCTOBER 2025
763Before Incident
SEPTEMBER 2025
762Before Incident
AUGUST 2025
761Before Incident
APRIL 2023
789Before Incident
Breach
19 Apr 2023 • GT
Grant Thornton LLP

Grant Thornton LLP Data Breach

741After Incident
HIGH-48
GRA519072625
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.
INCIDENT DETAILS -
TYPE
Data Breach
IMPACT
NamesUnspecified Personal Information
DATA BREACH
NamesUnspecified Personal Information
REFERENCES
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