Cybersecurity firms that implement CISA guidance
Every firm below is a real, operating cybersecurity practice with a verified website. We are an independent directory — listings are not endorsements, and no firm can pay for placement. CISA does not certify, endorse, or accredit any of these firms.
All firms
GuidePoint Security
GuidePoint Security is a cybersecurity consultancy with a Federal Solutions practice serving U.S. federal agencies and contractors. Its consultants perform security assessments, zero-trust roadmapping, and managed detection, and the firm holds federal contracting vehicles for agency work.
Coalfire
Coalfire is a cybersecurity advisory and assessment firm with a dedicated Coalfire Federal practice. It is an authorized FedRAMP Third Party Assessment Organization (3PAO), performs CMMC assessments, and advises commercial and public-sector clients on NIST-framework implementations.
SecureStrux
SecureStrux is a cybersecurity consulting firm specializing in NIST SP 800-171 and CMMC readiness for defense contractors and subcontractors. It offers gap assessments, System Security Plan development, POA&M management, and continuous monitoring support aligned to federal cybersecurity requirements.
Summit 7
Summit 7 is a Huntsville-based managed security provider built around the defense industrial base. It delivers CMMC/NIST 800-171 compliance programs, managed Microsoft 365 GCC High environments, and continuous monitoring for contractors handling controlled unclassified information.
ECS
ECS is a federal technology services provider delivering cybersecurity operations, zero-trust implementation, and Continuous Diagnostics and Mitigation (CDM) support to U.S. federal agencies. It works through major federal contracting vehicles and agency task orders.
Guidehouse
Guidehouse is a global consultancy with a large federal practice advising agencies on cybersecurity strategy, zero-trust implementation, risk management, and resilience. Its cybersecurity teams support both civilian agencies and critical-infrastructure clients.
Booz Allen Hamilton
Booz Allen Hamilton is a long-standing federal consultancy with deep cybersecurity practices supporting defense, intelligence, and civilian agencies — from zero-trust architecture and threat hunting to CISA-aligned vulnerability management programs.
Optiv
Optiv is a cybersecurity solutions provider offering advisory services, assessments, and managed security. Its consultants perform framework assessments against NIST CSF and CISA Cybersecurity Performance Goals, plus zero-trust and identity programs for mid-market and enterprise clients.
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Get matched quotesKroll
Kroll is a global risk advisory firm whose cyber practice is known for incident response and digital forensics, alongside proactive security assessments, tabletop exercises, and resilience programs aligned to NIST and CISA guidance.
Schellman
Schellman is an independent assessment firm and authorized FedRAMP 3PAO. It performs FedRAMP assessments, SOC examinations, and ISO 27001 audits for cloud providers and enterprises, with a reputation for senior assessor teams.
A-LIGN
A-LIGN is a technology-enabled assessment firm and authorized FedRAMP 3PAO offering SOC 2, ISO 27001, FedRAMP, and CMMC assessment services. Its high-volume model pairs assessors with compliance software for evidence collection.
Presidio
Presidio is an IT solutions provider with a federal practice delivering cybersecurity assessments, zero-trust architecture, and managed security services to agencies and public-sector-adjacent enterprises.
Redspin
Redspin is an authorized CMMC Third-Party Assessment Organization (C3PAO) and one of the first firms to complete an official CMMC assessment. It performs CMMC Level 2 assessments and advises defense contractors on NIST 800-171 readiness.
Sera-Brynn
Sera-Brynn is a cybersecurity audit and compliance firm performing NIST 800-171 assessments, CMMC readiness work, and compliance audits for defense contractors and regulated businesses.
CACI
CACI provides technology and expertise to U.S. federal agencies, including cybersecurity operations, zero-trust implementation, and mission IT. Its cyber work spans defensive operations, vulnerability management, and security engineering for defense and intelligence customers.
Parsons
Parsons is an engineering and technology firm serving national security and critical infrastructure markets. Its cybersecurity work includes OT/ICS security, infrastructure protection, and CISA-aligned resilience programs for utilities, transportation, and federal customers.
Federal agencies
BOD compliance, CDM, zero trust per OMB M-22-09 — firms that work the federal stack daily.
| Firm | Type | Planning range | Typical timeline |
|---|---|---|---|
| GuidePoint Security | Cybersecurity consultancy with a dedicated Federal Solutions practice | Not published — request a scoped quote | Varies — confirm in proposal |
| Coalfire | Cybersecurity advisory and assessment firm (Coalfire Federal for public-sector work) | Not published — request a scoped quote | Varies — confirm in proposal |
| SecureStrux | Cybersecurity consulting firm focused on defense and federal compliance | Not published — request a scoped quote | Varies — confirm in proposal |
| ECS | Federal IT and cybersecurity services provider | Not published — request a scoped quote | Varies — confirm in proposal |
| Guidehouse | Global consultancy with a federal cybersecurity practice | Not published — request a scoped quote | Varies — confirm in proposal |
| Booz Allen Hamilton | Federal technology and cybersecurity consultancy | Not published — request a scoped quote | Varies — confirm in proposal |
| Kroll | Risk advisory firm with cyber incident response and assessment practice | Not published — request a scoped quote | Varies — confirm in proposal |
| Schellman | Independent assessment firm (FedRAMP 3PAO, SOC, ISO, HITRUST) | Not published — request a scoped quote | Varies — confirm in proposal |
| A-LIGN | Assessment and compliance firm (FedRAMP 3PAO) | Not published — request a scoped quote | Varies — confirm in proposal |
| Presidio | IT solutions provider with a federal cybersecurity practice | Not published — request a scoped quote | Varies — confirm in proposal |
| CACI | Federal technology and mission-support provider | Not published — request a scoped quote | Varies — confirm in proposal |
| Parsons | National security and critical-infrastructure engineering firm | Not published — request a scoped quote | Varies — confirm in proposal |
Planning ranges are not quotes. See our methodology for how prices are labeled and verified.
Federal contractors
CUI protection, CMMC/800-171 readiness, and customer-flowed federal requirements.
| Firm | Type | Planning range | Typical timeline |
|---|---|---|---|
| GuidePoint Security | Cybersecurity consultancy with a dedicated Federal Solutions practice | Not published — request a scoped quote | Varies — confirm in proposal |
| Coalfire | Cybersecurity advisory and assessment firm (Coalfire Federal for public-sector work) | Not published — request a scoped quote | Varies — confirm in proposal |
| SecureStrux | Cybersecurity consulting firm focused on defense and federal compliance | Not published — request a scoped quote | Varies — confirm in proposal |
| Summit 7 | Managed security and compliance provider for the defense industrial base | Not published — request a scoped quote | Varies — confirm in proposal |
| Booz Allen Hamilton | Federal technology and cybersecurity consultancy | Not published — request a scoped quote | Varies — confirm in proposal |
| Schellman | Independent assessment firm (FedRAMP 3PAO, SOC, ISO, HITRUST) | Not published — request a scoped quote | Varies — confirm in proposal |
| A-LIGN | Assessment and compliance firm (FedRAMP 3PAO) | Not published — request a scoped quote | Varies — confirm in proposal |
| Redspin | Authorized CMMC Third-Party Assessment Organization (C3PAO) | Not published — request a scoped quote | Varies — confirm in proposal |
| Sera-Brynn | Cybersecurity audit and compliance firm | Not published — request a scoped quote | Varies — confirm in proposal |
| CACI | Federal technology and mission-support provider | Not published — request a scoped quote | Varies — confirm in proposal |
Planning ranges are not quotes. See our methodology for how prices are labeled and verified.
Critical infrastructure
CPG alignment, Shields Up posture, OT/ICS security, sector coordination.
| Firm | Type | Planning range | Typical timeline |
|---|---|---|---|
| Guidehouse | Global consultancy with a federal cybersecurity practice | Not published — request a scoped quote | Varies — confirm in proposal |
| Optiv | Cybersecurity advisory and managed security firm | Not published — request a scoped quote | Varies — confirm in proposal |
| Kroll | Risk advisory firm with cyber incident response and assessment practice | Not published — request a scoped quote | Varies — confirm in proposal |
| Parsons | National security and critical-infrastructure engineering firm | Not published — request a scoped quote | Varies — confirm in proposal |
Planning ranges are not quotes. See our methodology for how prices are labeled and verified.
Commercial enterprises
Voluntarily aligning to CISA CPGs and Secure by Design — often for customers or insurers.
| Firm | Type | Planning range | Typical timeline |
|---|---|---|---|
| Coalfire | Cybersecurity advisory and assessment firm (Coalfire Federal for public-sector work) | Not published — request a scoped quote | Varies — confirm in proposal |
| Optiv | Cybersecurity advisory and managed security firm | Not published — request a scoped quote | Varies — confirm in proposal |
| Kroll | Risk advisory firm with cyber incident response and assessment practice | Not published — request a scoped quote | Varies — confirm in proposal |
| Schellman | Independent assessment firm (FedRAMP 3PAO, SOC, ISO, HITRUST) | Not published — request a scoped quote | Varies — confirm in proposal |
| A-LIGN | Assessment and compliance firm (FedRAMP 3PAO) | Not published — request a scoped quote | Varies — confirm in proposal |
| Presidio | IT solutions provider with a federal cybersecurity practice | Not published — request a scoped quote | Varies — confirm in proposal |
| Sera-Brynn | Cybersecurity audit and compliance firm | Not published — request a scoped quote | Varies — confirm in proposal |
Planning ranges are not quotes. See our methodology for how prices are labeled and verified.
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