BSI C5
Audit firms that issue C5 attestations
The listed firms claim to offer C5 attestations in the internet. Alphabetical order.
A-Lign Assurance
(Global)
ADVANTA
(DEU) (added 25.10.2025)
BDO Deutschland
(DEU)
BFMT Audit
(DE) (added 25.10.2025)
cert4Startups
(DE) (added 25.10.2025)
Coalfire Controls
(US)
DCSO
(DEU) (added 25.10.2025)
Deloitte
(DEU) (updated 10.12.2024)
DHPG
(DEU) (added 25.10.2025)
Dr. Stückmann und Partner
(DEU) (added 2.2.2025)
EY
(DEU)
FIDES Treuhand
(DEU)
GKK Partners
(DEU) (added 27.3.2026)
HKKG
(DEU)
IT AUDIT
(DEU) (added 3.12.2024)
KPMG
(DEU)
Lazarus Alliance
(US)
Moss Adams
(US)
nbs partners
(DEU) (added 24.11.2024)
PwC Germany
(DEU)
Rödl & Partner
(DEU)
RSM Ebner Stolz
(DEU) (added 5.2.2026)
Schellman
(US)
Securance Audit Professionals
(DEU) (added 25.10.2025)
Simpliant
(DEU)
TÜV Nord Group
(DEU)
WP Koehler
(DEU) (added 6.2.2026)
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