Buying a zero trust platform is the easy part. Making it work across identity, devices, networks, applications and data is where most programs stall, which is why so many security leaders bring in zero trust consultants before they sign another license. The right partner maps your environment against a recognized model such as NIST SP 800-207 or the CISA Zero Trust Maturity Model, builds a phased roadmap, and then does the unglamorous work of rolling out ZTNA, segmentation and identity policy without breaking the business.
This list covers firms whose own sites show dedicated zero trust consulting and implementation work, from specialists that have built their whole business around the model to integrators and large advisory firms that run zero trust programs at scale. If you are also comparing wider security partners, our guides to cyber security companies in Manchester and embedded security testing companies and device auditors cover adjacent services.
We focused on what each firm actually publishes: named methodologies, frameworks, vendor partnerships stated on their own pages, and case work they are willing to put their name to. Where a claim comes from the company itself, we say so.
Zero Trust Architecture Consultants At A Glance
Company
Headquarters
Best For
Core Services
ON2IT
Zaltbommel, Netherlands
Organizations that want zero trust run as a managed service
Zero trust consulting, MDR, managed GSOC on the AUXO platform
GuidePoint Security
Reston, Virginia, US
Incremental zero trust adoption with Zscaler
Zero trust workshops, ZTNA readiness, Zscaler deployment and managed services
Kudelski Security
Cheseaux-sur-Lausanne, Switzerland
Vendor-neutral maturity scoring and board-ready roadmaps
Zero trust assessment, stakeholder workshops, phased roadmap
Optiv
Denver, Colorado, US
Large enterprises standardizing on Zscaler SASE
Zero trust strategy, maturity assessment, SASE implementation, managed services
Opsio
Karlstad, Sweden
Cloud-first companies that need design through handover
Current-state assessment, architecture design, ZTNA and microsegmentation rollout
Plurilock
Vancouver, Canada
Public sector and regulated buyers wanting a cross-domain assessment
Zero trust program assessment, IAM, data protection
The Server Labs
London, UK
UK public sector and enterprise cloud estates
Zero trust blueprint, cloud security hardening, implementation
Presidio
New York, US
Mid-market and enterprise network-led zero trust
Zero trust networking, PAM, NAC, Zscaler joint solutions
Booz Allen Hamilton
McLean, Virginia, US
US federal and defense agencies
Zero trust accelerator, ZTNA at scale, ICAM, OT zero trust
Deloitte
New York, US
Global enterprises needing advisory, build and run in one contract
Zero trust assessment, strategy, implementation, managed zero trust access
Best Zero Trust Consultants In 2026
Specialists come first, followed by integrators and the two large advisory firms that made the cut.
1. ON2IT — Zero Trust Managed Services Firm Founded In 2005 With Its Own AUXO Platform
Few firms can claim zero trust as their origin story, but ON2IT can. The company says it was founded in 2005 on zero trust principles and has more than 20 years of work in the model. It calls itself a “Zero Trust Innovators” company and co-wrote its Zero Trust Dictionary with John Kindervag, whom its site credits as the creator of Zero Trust.
What sets ON2IT apart is that it does not stop at a roadmap. Its services, including zero trust consulting, MDR Detect and MDR Prevent, all run on AUXO, the company’s own zero trust platform. According to its site, AUXO has been live since 2013, sits at the core of its managed global SOC, and uses self-owned AI infrastructure rather than third-party AI providers. ON2IT also offers Palo Alto Networks-certified training and hands-on labs.
The main named customer story on its site is Damen Shipyards, a global shipbuilder, where the work spans IT, OT and cloud. The firm operates from Zaltbommel in the Netherlands and Plano, Texas.
ON2IT suits organizations that want zero trust consulting tied directly to ongoing operations, particularly those with OT or industrial environments, and buyers who would rather have one partner design, enforce and monitor the policy than juggle several.
2. GuidePoint Security — Five-Phase Zero Trust Workshops And Zscaler Authorized Delivery
GuidePoint Security, based in Reston, Virginia, built its zero trust practice around incremental adoption. Its Zero Trust Workshops are designed to help organizations move to a “never trust, always verify” model without re-architecting the entire network, starting with a maturity assessment and moving toward specific capabilities.
The workshops follow five phases: Discover, Assess, Design, Build and Maintain. In practice that means identifying stakeholders and use cases, classifying high-value assets and running a gap analysis, selecting technology and signing off a detailed design, piloting and rolling out policies, and then providing quarterly health checks and ongoing tuning. When the program launched, GuidePoint said its pillars were based on CISA, NIST and DoD guidance, covering identity, device, network, application workload and data.
On the implementation side, GuidePoint describes itself as one of a handful of nationally recognized Zscaler Authorized Delivery partners, with more than a decade working with Zscaler. Its zero trust services there include ZTNA readiness assessments, health checks, architecture and deployment, SASE and SSE workshops, managed Zscaler services, and integration with SD-WAN, SIEM, IAM, EDR and OT/IoT microsegmentation.
GuidePoint is a strong fit for US organizations that already lean toward Zscaler, or plan to, and want a consulting partner that can carry the work from first workshop to steady-state operations.
3. Kudelski Security — Vendor-Agnostic Zero Trust Assessments Mapped To NIST SP 800-207
Kudelski Security is the cybersecurity division of the Kudelski Group, with its international headquarters in Cheseaux-sur-Lausanne, Switzerland, and its US headquarters in Phoenix, Arizona. The company lists more than 400 dedicated consultants, engineers and specialists and offices in 24 countries.
Its Zero Trust Assessment is explicitly framed against NIST SP 800-207 and the CISA Zero Trust Maturity Model, and the company describes the approach as vendor-agnostic. The engagement runs in four phases: knowledge gathering through document review and interviews, stakeholder workshops that align security architects and business leaders on risk appetite, maturity scoring against zero trust pillars, and a prioritized, phased roadmap with executive-ready reporting.
The methodology maps assets, identities, applications and network flows against zero trust principles and includes hands-on technical validation, according to its site. Reporting includes guidance on what each control should look like at each maturity level, which makes the output useful for both the board and the engineers who have to act on it.
Kudelski is best for organizations that want an independent view of where they stand before committing to a vendor stack, and for multinational firms that need a partner with presence in both Europe and the US.
4. Optiv — Zscaler 2024 Services Partner Of The Year With Five Implementation Tiers
Denver-based Optiv, formed in 2015 from the merger of Accuvant and FishNet Security, is a security solutions integrator, and zero trust runs through several of its service lines. Its zero trust offering combines Zero Trust Strategy Planning, a Zero Trust Maturity Assessment, identity services including privileged access management, network security and SASE, and managed detection and response.
The Zscaler relationship is where Optiv publishes the most detail. The company describes itself as Zscaler’s third-largest partner, working together since 2016, and lists Zscaler’s 2024 Services Partner of the Year award plus Americas Partner of the Year in 2021 and 2022. It reports more than 190 Zscaler certifications and offers implementation at five tiers, from Basic to Optimum, along with platform optimization, SASE and SSE roadmapping, and co-managed staffing.
Optiv references the CISA Zero Trust Maturity Model on its zero trust page and publishes a Zero Trust Field Guide. It also cites IDC PlanScape for Zero Trust Security Services, quoting IDC that Optiv and Optiv+ClearShark have “one of the more detailed and far-reaching approaches to zero trust security services.” A case study on its site describes a zero trust roadmap for a national law firm.
Optiv suits large enterprises that want a single partner across strategy, Zscaler deployment and long-term managed services.
5. Opsio — Five-Phase Zero Trust Consulting From Assessment To Operational Handover
Opsio is a cloud services company founded in 2018 and headquartered in Karlstad, Sweden, with delivery offices in Bangalore, Chennai, Gurgaon and Pune. It holds AWS Advanced Tier Services Partner status and the AWS Migration and Modernization Competency, according to its site, and is also listed as a Microsoft Partner and Google Cloud Partner.
Its zero trust architecture consulting runs in five phases. A current-state assessment maps identity, network, application and data flows against zero trust principles, which Opsio says typically takes four to six weeks. That feeds a prioritized roadmap with budget and timeline estimates, then architecture design covering identity provider configuration, network segmentation and policy engine rules. Implementation support covers identity setup, microsegmentation, ZTNA for remote access and SIEM/SOAR integration through phased pilots, and the engagement closes with runbooks and knowledge transfer.
Opsio’s material references NIST SP 800-207 and the CISA model’s five pillars of identity, devices, networks, applications and data, and lists ISO 27001 and ISO 27701 certification for its Bangalore entity.
Opsio fits cloud-first mid-size companies, especially those on AWS, that want a defined path from assessment to an internal team that can run the environment on its own.
6. Plurilock — Zero Trust Program Assessments Aligned To CISA ZTMM 2.0
Plurilock is a Vancouver-based, publicly traded security company (TSXV: PLUR) that describes itself as “services led, product enabled.” Zero trust sits within its data protection services alongside IAM, DLP, and PKI and encryption, and the company serves what it calls allied governments and critical enterprises from offices across Canada and the US.
Its Zero Trust Program Assessment aligns with the CISA Zero Trust Maturity Model 2.0 and NIST SP 800-207. Rather than reviewing one product, Plurilock says it examines how controls work together across network microsegmentation, IAM, CASB, SASE, ZTNA, secure web gateways and endpoint management. The team works directly with the client’s engineers and builds on existing policies and tools, producing structured recommendations and identifying where current controls are not effective.
That cross-domain view is useful for organizations that have bought several zero trust components over the years and are unsure whether they add up to a coherent architecture. Plurilock also runs adversary simulation, cloud security and GRC services, so findings can feed straight into testing.
Plurilock suits Canadian and US public sector buyers and regulated enterprises. Buyers should note that its homepage announces a pending acquisition by Quantum eMotion, so it is worth asking about continuity of the services team.
7. The Server Labs — Cloud Zero Trust Blueprints For AWS, Azure And Google Cloud
The Server Labs is a London-based cloud consultancy known for high-performance computing, cloud migration and cloud security. Zero trust sits within its “Trusted Foundations” practice as a Zero-Trust Security Blueprint and Security Hardening service, alongside sovereignty and compliance, DevSecOps and well-architected reviews.
Its zero trust service listing on the UK government’s G-Cloud 14 Digital Marketplace breaks the work into a zero trust assessment, architecture design and implementation. Listed features include microsegmentation, identity-based access control, continuous monitoring and analytics, and deploying secure clouds in line with NCSC guidance, across AWS, Azure and Google Cloud. The same listing publishes day rates of £950 to £1,700, which is unusually transparent for this market.
The company’s site shows a client base that leans toward science, government and finance, naming Genomics England, the NHS, the UK Government, BBVA and the European Space Agency in its track record. It holds ISO 27001 and Cyber Essentials Plus certifications.
The Server Labs is best for UK public sector bodies and enterprises whose zero trust problem is mainly a cloud problem, and who want a team that can build the landing zone and the access model together.
8. Presidio — Five-Step Zero Trust Networking Program With Zscaler Joint Solutions
Presidio is a New York-headquartered digital systems integrator with roughly 3,000 employees, working across cloud, security and infrastructure. Its zero trust networking solution follows a five-step process: define and protect the surface, map and classify access and data dependencies, establish policy, assess and implement the architecture, and monitor and maintain as threats and the business change.
Services under that program include zero trust consulting and implementation, privileged access management, application access management, network access control, directory services and architecture reviews. Presidio says its methodology draws on NIST, CIS and ISO, and covers compliance regimes including PCI, HIPAA, NERC CIP, SOC 2, DFARS 800-171 and CMMC.
With Zscaler, Presidio packages four joint zero trust use cases on its site: securing users, workloads, OT and IoT devices, and B2B application access. It also covers zero trust for branch and cloud and controls for public and private AI tools.
Presidio fits organizations whose zero trust journey starts in the network team, and that want an integrator able to handle hardware, licensing and services through a single relationship.
9. Booz Allen Hamilton — Builder Of DISA’s Thunderdome Zero Trust Architecture
Booz Allen Hamilton, headquartered in McLean, Virginia, is the obvious name for US federal zero trust work. In August 2023 the company announced a follow-on production agreement from the Defense Information Systems Agency for at-scale deployment of Thunderdome, DISA’s zero trust network access and application security architecture. During the earlier prototype, Booz Allen says DISA onboarded more than 1,800 users and the company earned an Authority to Operate on both unclassified and classified networks.
Its zero trust practice now spans several named offerings. The ZT Accelerator provides rapid assessment, baselines, roadmaps and blueprints. ZT Data Exchange combines ICAM, attribute-based access control, data tagging and encryption for object-level control. ZT Edge uses SD-WAN and a customer edge security stack, and a separate offering applies zero trust to OT environments aligned to the Purdue Model. Booz Allen aligns this work to CISA, Department of Defense and intelligence community zero trust models.
The company is also a member of the OT Zero Trust Alliance and has invested in Shift5 for cyber-physical resilience.
Booz Allen is built for federal civilian, defense and intelligence agencies, along with critical infrastructure operators that need clearance-ready teams. Commercial mid-market buyers will likely find it oversized.
10. Deloitte — Zero Trust Assessment, Implementation And Managed Services At Global Scale
Deloitte offers zero trust services that cover the full lifecycle: assessment against its own zero trust framework, strategy and reference architecture development, technology selection and pilot-first implementation, and outcome-based managed services. It also runs a managed Zero Trust Access service for connecting users to applications.
Deloitte’s framework has three layers: governance (architecture, culture and operations), enabling capabilities (telemetry, analytics, automation and orchestration), and core domains covering identities, workloads, data, networks and devices. The firm says it uses proprietary accelerators and maturity assessments and maintains a Zero Trust Center of Excellence.
Its US zero trust page gives industry examples rather than named clients: microsegmentation and least-privilege access in financial services, reference architectures in life sciences, SaaS access in technology and media, and IT/OT convergence in manufacturing. Globally, Deloitte cites around 25,000 cyber practitioners across 150 countries and territories.
Deloitte is the choice for multinationals that want zero trust tied to broader transformation, risk and audit work under one contract. Smaller firms will get more senior attention from the specialists above.
How To Choose A Zero Trust Consultant
Which framework will they measure you against?
Ask which model the assessment uses and how maturity is scored. NIST SP 800-207 defines the architecture, while the CISA Zero Trust Maturity Model gives you stages across identity, devices, networks, applications and data. Federal and defense work will also reference the DoD zero trust strategy. A good consultant can show a sample scorecard and explain how a control moves from one maturity level to the next.
Are they vendor-neutral or tied to a platform?
Many of the strongest zero trust services firms are also top resellers for Zscaler, Palo Alto Networks, Microsoft or Cloudflare. That brings deep implementation skill, but it can shape the recommendation. If you have not picked a platform, consider a vendor-agnostic assessment first, then bring in an implementation partner once the architecture is settled.
Can they implement, or only advise?
A roadmap that never gets built is expensive shelfware. Check whether the firm has engineers who deploy ZTNA, configure identity providers and roll out microsegmentation, and ask for a pilot plan with success criteria. Phased pilots in monitor mode before enforcement are a sign of a team that has done this before.
How do they handle identity, the hardest pillar?
Most zero trust programs succeed or fail on identity: clean directories, strong authentication, privileged access and joiner-mover-leaver processes. Ask how the consultant sequences identity work against network changes, and whether they have IAM and PAM specialists in-house or subcontract them.
What happens after go-live?
Zero trust policies drift as applications, users and threats change. Find out whether the firm offers health checks, managed services or policy tuning, and what knowledge transfer and runbooks your team will receive if you plan to run things yourself.
How is the engagement priced?
Assessments are usually fixed-fee, while implementation is often time and materials or tiered packages. Ask for day rates, the expected length of the discovery phase, and what is out of scope. Published rates are rare, so a clear statement of work matters more than a headline number.
Conclusion
The best zero trust consultants share a few traits: they assess against a recognized model, they are honest about their vendor ties, and they can carry a program from workshop to enforced policy. Specialists such as ON2IT, GuidePoint Security and Kudelski Security bring depth, integrators like Optiv and Presidio bring platform scale, and Booz Allen and Deloitte cover the largest public sector and multinational programs.
Start with a short list of two or three firms, ask each for a sample maturity report and pilot plan, and choose the one whose zero trust consulting approach fits your stack and your team’s capacity to run it. If your program also involves rebuilding internal applications for identity-aware access, our guide to custom software development companies is a useful next read.
