AGENCY LIST

Rule4

Boulder, Colorado, United States
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Security assessments, compliance audits, and incident response planning for regulated industries

Rule4, based in Boulder, Colorado, works across cybersecurity strategy, application security, cloud and network security, and incident response planning. Engagements extend into specialized areas including OT/ICS/SCADA assessments, medical device cybersecurity, and AI security assessment, alongside privacy controls assessment and data privacy strategy.

Compliance work spans CMMC and NIST 800-171, PCI DSS, HIPAA and healthcare/life sciences requirements, NIST 800-53 and FedRAMP, and ISO 27001, positioning the firm for clients in regulated sectors that need governance alongside technical security review. Rule4 states it has earned the trust of more than 250 organizations.

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SERVICES

Capabilities

Category

Cybersecurity

Services

About this agency on Agency List

Rule4 holds an Agency List Score of 73 out of 100.

That score is higher than 36% of the 36,920 agencies Agency List has assessed so far.

The Agency List Score measures how well an agency documents its work in public: named clients, quantified outcomes, and whether those outcomes are attributed to the agency rather than to the client.

It does not measure client satisfaction, price, or availability.

How the Agency List Score is measured

Assessment date

Agency List assessed Rule4 in September 2026, reading 5 pages published on rule4.com.

The score reflects what Rule4 had published by that date; anything published since has not been read.

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