Comparison Overview

Optionis Group

VS

Grant Thornton (US)

Optionis Group

Last Update: 2025-12-17
Between 700 and 749

The Optionis group are experts in accountancy, employment, tax and professional services to the contractor and SME markets. Operating through several brands including ; SJD Accountancy, Nixon Williams, Parasol, ClearSky Contractor Accounting, Brian Alfred and ClearSky Business. SJD Accountancy is the largest contractor accounting specialist in the UK supporting over 15,000 clients and with offices throughout the UK Nixon Williams has been providing specialist accountancy services to contractors, freelancers, consultants and interim professionals throughout the UK since 1995 Parasol is a professional employment organisation (PEO) and the leading provider of outsourced employment services to the UK’s contingent workforce, the staffing businesses who deal with them and the hirers who rely on their skills and knowledge ClearSky Contractor Accounting, one of the UK's largest accountancy firms, is a specialist provider of hassle-free support and advice to Limited company contractors and freelancers First Freelance specialises in tailored contractor accountancy and support services, with their clients including the antipodean market Brian Alfred is one of the UK’s leading tax rebate specialists, Brian Alfred helps CIS, self-employed and PAYE workers gain maximum tax rebates in just 24 hours ClearSky Business supports SMEs across the UK with expert and affordable accounting, payroll and tax support The Optionis group employs around 700 head office employees across 10 sites around the UK. For more information visit www.optionis.co.uk

NAICS: 5412
NAICS Definition: Accounting, Tax Preparation, Bookkeeping, and Payroll Services
Employees: 324
Subsidiaries: 3
12-month incidents
0
Known data breaches
1
Attack type number
1

Grant Thornton (US)

171 N. Clark Street, Suite 200, Chicago, IL, US, 60601
Last Update: 2025-12-17
Between 750 and 799

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.​

NAICS: 5412
NAICS Definition: Accounting, Tax Preparation, Bookkeeping, and Payroll Services
Employees: 11,442
Subsidiaries: 0
12-month incidents
0
Known data breaches
1
Attack type number
1

Compliance Badges Comparison

Security & Compliance Standards Overview

https://images.rankiteo.com/companyimages/optionis.jpeg
Optionis Group
ISO 27001
ISO 27001 certification not verified
Not verified
SOC2 Type 1
SOC2 Type 1 certification not verified
Not verified
SOC2 Type 2
SOC2 Type 2 certification not verified
Not verified
GDPR
GDPR certification not verified
Not verified
PCI DSS
PCI DSS certification not verified
Not verified
HIPAA
HIPAA certification not verified
Not verified
https://images.rankiteo.com/companyimages/grant-thornton-us.jpeg
Grant Thornton (US)
ISO 27001
ISO 27001 certification not verified
Not verified
SOC2 Type 1
SOC2 Type 1 certification not verified
Not verified
SOC2 Type 2
SOC2 Type 2 certification not verified
Not verified
GDPR
GDPR certification not verified
Not verified
PCI DSS
PCI DSS certification not verified
Not verified
HIPAA
HIPAA certification not verified
Not verified
Compliance Summary
Optionis Group
100%
Compliance Rate
0/4 Standards Verified
Grant Thornton (US)
0%
Compliance Rate
0/4 Standards Verified

Benchmark & Cyber Underwriting Signals

Incidents vs Accounting Industry Average (This Year)

No incidents recorded for Optionis Group in 2025.

Incidents vs Accounting Industry Average (This Year)

No incidents recorded for Grant Thornton (US) in 2025.

Incident History — Optionis Group (X = Date, Y = Severity)

Optionis Group cyber incidents detection timeline including parent company and subsidiaries

Incident History — Grant Thornton (US) (X = Date, Y = Severity)

Grant Thornton (US) cyber incidents detection timeline including parent company and subsidiaries

Notable Incidents

Last 3 Security & Risk Events by Company

https://images.rankiteo.com/companyimages/optionis.jpeg
Optionis Group
Incidents

Date Detected: 6/2016
Type:Breach
Blog: Blog
https://images.rankiteo.com/companyimages/grant-thornton-us.jpeg
Grant Thornton (US)
Incidents

Date Detected: 4/2023
Type:Breach
Attack Vector: Email Account Compromise
Blog: Blog

FAQ

Grant Thornton (US) company demonstrates a stronger AI Cybersecurity Score compared to Optionis Group company, reflecting its advanced cybersecurity posture governance and monitoring frameworks.

Optionis Group and Grant Thornton (US) have experienced a similar number of publicly disclosed cyber incidents.

In the current year, Grant Thornton (US) company and Optionis Group company have not reported any cyber incidents.

Neither Grant Thornton (US) company nor Optionis Group company has reported experiencing a ransomware attack publicly.

Both Grant Thornton (US) company and Optionis Group company have disclosed experiencing at least one data breach.

Neither Grant Thornton (US) company nor Optionis Group company has reported experiencing targeted cyberattacks publicly.

Neither Optionis Group company nor Grant Thornton (US) company has reported experiencing or disclosing vulnerabilities publicly.

Neither Optionis Group nor Grant Thornton (US) holds any compliance certifications.

Neither company holds any compliance certifications.

Optionis Group company has more subsidiaries worldwide compared to Grant Thornton (US) company.

Grant Thornton (US) company employs more people globally than Optionis Group company, reflecting its scale as a Accounting.

Neither Optionis Group nor Grant Thornton (US) holds SOC 2 Type 1 certification.

Neither Optionis Group nor Grant Thornton (US) holds SOC 2 Type 2 certification.

Neither Optionis Group nor Grant Thornton (US) holds ISO 27001 certification.

Neither Optionis Group nor Grant Thornton (US) holds PCI DSS certification.

Neither Optionis Group nor Grant Thornton (US) holds HIPAA certification.

Neither Optionis Group nor Grant Thornton (US) holds GDPR certification.

Latest Global CVEs (Not Company-Specific)

Description

httparty is an API tool. In versions 0.23.2 and prior, httparty is vulnerable to SSRF. This issue can pose a risk of leaking API keys, and it can also allow third parties to issue requests to internal servers. This issue has been patched via commit 0529bcd.

Risk Information
cvss4
Base: 8.8
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description

5ire is a cross-platform desktop artificial intelligence assistant and model context protocol client. In versions 0.15.2 and prior, an RCE vulnerability exists in useMarkdown.ts, where the markdown-it-mermaid plugin is initialized with securityLevel: 'loose'. This configuration explicitly permits the rendering of HTML tags within Mermaid diagram nodes. This issue has not been patched at time of publication.

Risk Information
cvss3
Base: 9.6
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Description

continuwuity is a Matrix homeserver written in Rust. Prior to version 0.5.0, this vulnerability allows a remote, unauthenticated attacker to force the target server to cryptographically sign arbitrary membership events. The flaw exists because the server fails to validate the origin of a signing request, provided the event's state_key is a valid user ID belonging to the target server. This issue has been patched in version 0.5.0. A workaround for this issue involves blocking access to the PUT /_matrix/federation/v2/invite/{roomId}/{eventId} endpoint using the reverse proxy.

Risk Information
cvss4
Base: 9.9
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description

LangChain is a framework for building LLM-powered applications. Prior to @langchain/core versions 0.3.80 and 1.1.8, and prior to langchain versions 0.3.37 and 1.2.3, a serialization injection vulnerability exists in LangChain JS's toJSON() method (and subsequently when string-ifying objects using JSON.stringify(). The method did not escape objects with 'lc' keys when serializing free-form data in kwargs. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate LangChain object during deserialization rather than plain user data. This issue has been patched in @langchain/core versions 0.3.80 and 1.1.8, and langchain versions 0.3.37 and 1.2.3

Risk Information
cvss3
Base: 8.6
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Description

LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate LangChain object during deserialization rather than plain user data. This issue has been patched in versions 0.3.81 and 1.2.5.

Risk Information
cvss3
Base: 9.3
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N