Comparison Overview

Optionis Group

VS

Mazars

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

Mazars

Tour Exaltis, 61 rue Henri Regnault, Paris La Defense, FR, 92075
Last Update: 2025-12-17
Between 750 and 799

Mazars is an internationally integrated partnership, specialising in audit, accountancy, advisory, tax and legal services*. Operating in over 100 countries and territories around the world, we draw on the expertise of more than 50,000 professionals – 33,000+ in Mazars’ integrated partnership and 17,000+ via the Mazars North America Alliance – to assist clients of all sizes at every stage in their development. *Where permitted under applicable country laws

NAICS: 5412
NAICS Definition: Accounting, Tax Preparation, Bookkeeping, and Payroll Services
Employees: 13,721
Subsidiaries: 32
12-month incidents
0
Known data breaches
2
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/mazars.jpeg
Mazars
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
Mazars
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 Mazars in 2025.

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

Optionis Group cyber incidents detection timeline including parent company and subsidiaries

Incident History — Mazars (X = Date, Y = Severity)

Mazars 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/mazars.jpeg
Mazars
Incidents

Date Detected: 10/2025
Type:Breach
Blog: Blog

Date Detected: 10/2012
Type:Breach
Attack Vector: Physical Theft (Stolen Laptop)
Blog: Blog

FAQ

Mazars company demonstrates a stronger AI Cybersecurity Score compared to Optionis Group company, reflecting its advanced cybersecurity posture governance and monitoring frameworks.

Mazars company has faced a higher number of disclosed cyber incidents historically compared to Optionis Group company.

In the current year, Mazars company has reported more cyber incidents than Optionis Group company.

Neither Mazars company nor Optionis Group company has reported experiencing a ransomware attack publicly.

Both Mazars company and Optionis Group company have disclosed experiencing at least one data breach.

Neither Mazars company nor Optionis Group company has reported experiencing targeted cyberattacks publicly.

Neither Optionis Group company nor Mazars company has reported experiencing or disclosing vulnerabilities publicly.

Neither Optionis Group nor Mazars holds any compliance certifications.

Neither company holds any compliance certifications.

Mazars company has more subsidiaries worldwide compared to Optionis Group company.

Mazars company employs more people globally than Optionis Group company, reflecting its scale as a Accounting.

Neither Optionis Group nor Mazars holds SOC 2 Type 1 certification.

Neither Optionis Group nor Mazars holds SOC 2 Type 2 certification.

Neither Optionis Group nor Mazars holds ISO 27001 certification.

Neither Optionis Group nor Mazars holds PCI DSS certification.

Neither Optionis Group nor Mazars holds HIPAA certification.

Neither Optionis Group nor Mazars 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