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Cyber Security Firms

Best Cyber Security Firms in Denver

Denver is a market with aerospace, energy, healthcare and a growing software sector, and home to several national security firms, which raises the bar for the local ones. The firms on this list were checked the same way as every list on the site. Rank one is the best overall, ranks two to four are the best for small business, managed detection and compliance work, and the rest cleared the same checks.

10 firms ranked15 evaluatedChecked
  1. 01Best overall
  2. 02Best for small business
  3. 03Best for managed detection
  4. 04Best for compliance
  5. 05+The rest of the shortlist, ranked on the same checks
Rank 01
Red Canary logo

Red Canary

Best overall

A Denver managed detection and response provider with a staffed operations center, now part of Zscaler.

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Why they are on this list
  • Founded in Denver in 2013 and still headquartered at 1601 19th Street downtown, with a staff of more than 400 stated on its own company page
  • Sells managed detection and response as the core product, with analysts reviewing detections around the clock rather than forwarding alerts to the customer
  • Its company page cites a Forrester Wave evaluation that named it a leader in managed detection and response
  • Covers endpoints, cloud workloads, identities and SaaS accounts under one service, so a small IT team is not stitching together separate monitoring contracts
  • Acquired by Zscaler in 2025, and the Denver address is still the only office listed on its contact page
Founded
2013
Size
200 to 500 staff
Sectors
Financial services, Healthcare, Technology, Manufacturing, Government
Managed detection and responseThreat intelligenceManaged phishing responseSecurity training and tabletop exercises$$Denver, CO
Visit website, Red Canary855-977-0686
Rank 02
K3 Technology logo

K3 Technology

Best for small business

A Denver Tech Center managed IT provider with a named security practice for small and mid-sized companies.

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Why they are on this list
  • Writes its security pages for small and mid-sized businesses specifically, and sells the security work as a named practice with its own page rather than as an add-on to a helpdesk contract
  • States on its own site that the firm itself holds ISO 27001 certification, which is a certificate a buyer can ask to see
  • Offers a virtual CISO engagement, which is the practical answer for a company that needs security decisions made but cannot justify a full-time hire
  • Names the Colorado Privacy Act alongside HIPAA, PCI DSS, CMMC, SOC 2 and the FTC Safeguards Rule in its compliance work, so a local buyer can see the state rule is in scope
  • Lists an Inc. 5000 placement and an MSP 501 win, both of which publish their own rankings
Attestations
ISO 27001
Sectors
Architecture, construction and engineering, Legal, Accounting, Manufacturing, Small and mid-sized business
Managed IT servicesManaged security monitoringVirtual CISOVulnerability management and penetration testing$Greenwood Village, CO
Visit website, K3 Technology303-770-8050
Rank 03
CP Cyber logo

CP Cyber

Best for managed detection

A Denver managed security provider running SOC and SIEM monitoring alongside its own testing team.

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Why they are on this list
  • Runs its monitoring as a 24/7 service covering endpoint, network and cloud assets, sold on a monthly subscription rather than as a project
  • Keeps one year of security event data as standard on the SOC and SIEM service, which is what an investigation into a late-discovered intrusion actually needs
  • Does its own penetration testing and vulnerability assessment work, so a finding from a test can be watched for in the monitoring service afterwards
  • Publishes a street address at 1512 Larimer Street in downtown Denver and a local phone number, so an incident call reaches people in the same time zone
  • Names healthcare as a specific practice with its own page rather than listing it among a dozen industries
SOC and SIEM monitoringPenetration testingVulnerability assessmentsCompliance and frameworks$$Denver, CO
Visit website, CP Cyber720-541-8910
Rank 04
Accedere logo

Accedere

Best for compliance

A Denver audit firm that performs SOC attestations and ISO certifications rather than only preparing companies for them.

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Why they are on this list
  • A Colorado licensed CPA firm, which is what allows it to issue SOC 1, SOC 2 and SOC 3 attestation reports rather than only prepare a company for someone else's audit
  • Listed by the Cloud Security Alliance on its own register of certified STAR auditors, under both ISO plus STAR certification and SOC 2 plus STAR attestation
  • States that it is an accredited ISO/IEC certification body, so an ISO 27001 certificate and a SOC 2 report can come out of the same engagement
  • Registered with the PCAOB, which is a public register a buyer can check before signing anything
  • Headquartered at 999 18th Street in downtown Denver, with offices in Mumbai and Dubai listed on its own contact page
Attestations
Colorado licensed CPA firm, ISO/IEC accredited certification body, CSA STAR certified auditor, PCAOB registered
SOC 1, SOC 2 and SOC 3 attestation reportsISO/IEC certification auditsCloud security assessmentsPrivacy assessments$$Denver, CO
Visit website, Accedere
Rank 05

Lares Consulting

A Denver adversarial testing firm that helped write the public standard for how a penetration test should be run.

Checked
  • Has operated since 2008 and reports more than 4,500 adversarial engagements across more than 600 customers on its own site
  • Co-created the Penetration Testing Execution Standard, the public methodology a buyer can read to see what a test should cover before comparing quotes
  • Requires the CISSP of its consultants and lists OSCP, OSEE, OSWE, GIAC and CISA credentials across the team
  • Runs purple team engagements, where the testers work alongside the defenders, which is the version that improves detection rather than only producing a report
  • Publishes customer counts by sector, including more than 60 financial institutions, 45 manufacturers and 55 software companies
Founded
2008
Sectors
Financial services, Manufacturing, Software, Healthcare, Critical infrastructure
Penetration testingRed team and purple team testingApplication and AI security testingAdvisory and virtual CISO$$$Denver, CO
Visit website, Lares Consulting720-600-0329
Rank 06

RM Cyber

The cyber security division of Richey May, an Englewood accounting firm with its own attest practice.

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  • A division of Richey May, whose corporate headquarters is at 9780 South Meridian Boulevard in Englewood, so the security team sits inside a firm that already performs attest work
  • Richey May runs an alternative practice structure in which Richey, May and Co., LLP performs the attest services and RM Advisory LLC does the tax and consulting work, which is the separation an auditor has to keep
  • Offers digital forensics and incident response with 24/7 support through the whole incident lifecycle, stated on its own service page
  • Delivers its managed monitoring through a partnership with Arctic Wolf rather than an operations center of its own, which is worth knowing before comparing it with a firm that runs one
  • Names the entertainment industry as a specific practice rather than claiming every sector
Virtual CISO and advisoryDigital forensics and incident responsePenetration testing and assessmentsManaged security services$$Englewood, CO
Visit website, RM Cyber303-721-6131
Also on the shortlist
Rank 07

SpyderSec

A Denver offensive security consultancy doing penetration testing, red teaming and virtual CISO work.

Website, SpyderSec
Rank 08

Artifice Security

A veteran owned Denver penetration testing firm doing manual testing across networks, applications and connected devices.

Website, Artifice Security
Rank 09

Cyber Sainik

A Denver Tech Center managed security provider selling detection, monitoring and virtual CISO work as one subscription.

Website, Cyber Sainik
Rank 10

NewPush

A Denver managed security provider operating since 1999, with a named practice for independent schools.

Website, NewPush

Cyber Security Firms may earn a referral fee if you engage a firm through a link on this site. How that works.

How to Choose a Cyber Security Firm in Denver

Denver gives a buyer an unusual choice. Two of the largest security firms in the country are headquartered in the metro, and so is a set of small consultancies whose whole team would fit in one room. Both are on this list, and the right answer depends on what you are buying rather than on size.

Start with the problem. A company that has never had anyone watching its systems needs monitoring first, because the common threats that reach a small business arrive through email and stolen passwords and are caught by someone reading detections, not by an annual test. A company being asked for a SOC 2 report by a customer needs an assessor, and Denver has one that can issue the report rather than only prepare you for someone else's audit. A company that has just found ransomware needs incident response and a lawyer, in that order.

Then check the local specifics. Colorado gives you 30 days from determining a breach to notify residents, which is shorter than most states, so ask a prospective firm how it handles the notification clock, not only the technical investigation. If you hold federal contracts, ask whether the CMMC work is done in-house. And ask which credentials on the website belong to the firm and which belong to individual consultants, because the difference matters when the named person leaves.

What the Ranks Mean

Rank one is the best firm overall on the checks in the editorial policy. Ranks two to four are the best firm for one kind of buyer each: a small business, an organization buying managed detection, and an organization facing compliance work. The rest of the shortlist cleared the same checks and is ordered on them. A low rank on this list is not a warning; a firm that failed a check is not on it.

Questions about hiring a cyber security firm

What do cyber security firms in Denver charge?

Monitoring is sold per device or per user per month, and the Denver firms here quote it as a subscription rather than a project, which for a fifty-person company usually lands in the low thousands of dollars a year. Penetration tests are scoped work, commonly a few thousand dollars for a small external test and considerably more for a large application. Incident response is billed hourly or on a retainer.

Do I need a cyber security firm based in Denver?

For monitoring, no. The work is remote and the right firm may be anywhere in the country. For incident response, a compliance assessment, a physical security test or staff training, people who can be in your building the same day are worth more than they sound. Several firms here do both, which is why the list mixes national scale with local offices.

What does Colorado law require after a data breach?

Section 6-1-716 of the Colorado Revised Statutes requires notice to affected Colorado residents in the most expedient time possible and no later than 30 days after you determine that a breach occurred. If 500 or more Colorado residents are affected, the attorney general must be told inside the same 30 days. That deadline is shorter than most states, so the investigation and the notification work have to start together.

Which industries drive cyber security demand in Denver?

Aerospace and defense contractors along the Front Range need CMMC and NIST SP 800-171 work because their contracts require it. Hospital systems and the health technology companies around them need HIPAA. Software companies downtown and in the Denver Tech Center are asked for SOC 2 reports by their own customers. Oil, gas and utilities bring operational technology into scope, which is a different skill from office security.

Should a small business buy monitoring or a penetration test first?

Monitoring, almost always. A penetration test tells you which doors are unlocked. Managed detection tells you that someone is already walking through one. A test also produces a list of fixes that a company without a security team often cannot act on. Buy the monitoring, fix what it surfaces in the first few months, then test once the basics hold.

What should I ask a Denver firm before hiring it?

Ask who answers an alert at three in the morning, whether that person is in Colorado, and what they are allowed to do without calling you first. Ask which credentials on the website belong to the firm and which belong to individual staff. Ask for a starting price for the work you described before the discovery call. Ask what the contract says happens during an incident.

How is this list put together?

Every firm is checked on what it actually does, the attestations that can be verified, its track record, a response test where we contact it as a prospective client, and how clear it is about scope and price. Rank one is the best firm overall. Ranks two to four are the best for small business, managed detection and compliance. The editorial policy sets out each check and what fails it.

Ranked lists in other cities

Each metro is researched on its own. A firm that leads nationally does not automatically appear on a city list, and most city leaders are not national names.

The national ranking