London, United Kingdom
BSI
Long-standing standards publisher that also operates as a global management-system certification body.
ISO 9001ISO/IEC 27001ISO 14001ISO 45001ISO/IEC 42001
Quality → security → AI governance
Choose an accredited registrar without the brochure fog.
A practical directory and compare guide for operations, quality, IT, and compliance leads choosing accredited registrars for ISO 9001, 27001, 14001, 45001, and ISO/IEC 42001. Compare real certification bodies, read the guides, then send one scope pack for quotes.
The path
Three layers most mid-market teams actually need
Standards desk
All standards →Quality · Quality
ISO 9001 Quality Management
The foundational quality-management system standard most mid-market manufacturers and many professional-services firms use to prove consistent process control.
Security · Security
ISO/IEC 27001 Information Security
The information-security management system standard that turns policies, risk treatment, and Annex A controls into something a customer or regulator can trust.
Environment · Operations stack
ISO 14001 Environmental Management
The environmental management system used by manufacturers and multi-site operators to control impacts, compliance obligations, and customer EHS expectations.
Safety · Operations stack
ISO 45001 Occupational Health and Safety
The OH&S management system standard that replaces a patchwork of older safety certificates with a single, auditable framework.
AI governance · AI governance
ISO/IEC 42001 AI Management
The first international AI management system standard — a governance layer for organizations that develop or use AI, not a model-quality badge.
Path · Full path
Integrated path (9001 + security + AI)
How mid-market teams sequence ISO 9001, the EHS pair, ISO/IEC 27001, and ISO/IEC 42001 without buying five disconnected certificates.
Featured certification bodies
Real, publicly known accredited CBs. Editorial summaries only — not endorsements, and not a complete global census.
Neuilly-sur-Seine, France
Bureau Veritas
Long-established TIC group used by manufacturers and asset-intensive operators for system certification.
ISO 9001ISO/IEC 27001ISO 14001ISO 45001
Høvik, Norway
DNV
Assurance and risk-management group with a large accredited business-assurance certification practice.
ISO 9001ISO/IEC 27001ISO 14001ISO 45001ISO/IEC 42001
London, United Kingdom
Intertek
Total Quality Assurance group that includes the former SAI Global Assurance certification business.
ISO 9001ISO/IEC 27001ISO 14001ISO 45001ISO/IEC 42001
Guides
All guides →13 min · 2026-08-28
What a certification body quote should include
How to read a registrar proposal — audit days, stages, travel, integration, and the line items that are easy to miss — without fabricated prices.
16 min · 2026-08-20
The 9001 → 27001 → 42001 path
Why mid-market manufacturers and professional-services firms should treat quality, information security, and AI management as a sequence — not three disconnected badges.
14 min · 2026-08-12
How to choose an accredited ISO registrar
A practical shortlist method for mid-market quality, IT, and compliance leads — accreditation first, brand second, and no invented prices.