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Top Cybersecurity Companies in the USA

15 of 96 cybersecurity companies ranked on evidence in the Q4 2026 edition.

Between them, the 96 best-ranked of these 105 cybersecurity companies cover IT services (67), web development (55), cybersecurity (45) and web design (38). They also list work in United Kingdom, Canada and Ireland. 96 of them have written a profile you can read before you get in touch.

TrustList ranking

Q4 2026 edition

15 of 96 cybersecurity companies ranked on evidence held on 12 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.

Positions are fixed for the quarter; the next edition is due in January 2027.

How this is ranked About this edition

All cybersecurity companies 15 ranked SMEs 15 ranked

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Qualys
Mobile App Development · Web Development · iOS App
Qualys is a US-listed company that sells cloud-based security and compliance software.
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Why #1: Address in United States of America · Founded 1999 · Client numbers stated on its own website, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
Bit by Bit Computer Consultants
Financial Services · Legal
Managed IT provider offering support, cybersecurity, custom applications and enterprise fax services to small businesses
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Why #2: Address in United States of America · In business 37+ years, as stated on its own website, read 28 Sept 2026
Not yet on record: client reviews, vetting.
SECUDE
IT Services · E-Commerce Development · Network Security · Also in Switzerland
SECUDE is a security software company with a long record in protecting data in SAP environments.
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Why #3: Office in United States of America · Founded 1996, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Optimum-web
Mobile App Development · Web Development · Web Design · Also in Ukraine
Optimum-web is a software development company that has operated since 1999 from Chisinau, Moldova.
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Why #4: Address in United States of America · Founded 1999, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
TT
TDI (Tetrad Digital Integrity)
Mobile App Development · IT Services · Web Development
Cybersecurity consultancy offering governance, engineering and performance management to government and commercial clients
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Why #5: Based in Washington DC, with locations in Maryland, Virginia and the United Kingdom · Founded 2001, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
Proofpoint
IT Services · Web Development · Web Design
Proofpoint is a cybersecurity company that focuses on attacks aimed at people rather than machines.
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Why #6: Based in Sunnyvale, California · Founded 2002, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
V
VigiTrust
IT Services · Web Development · Web Design · Also in Ireland
VigiTrust is a governance, risk and compliance software company headquartered in Dublin, Ireland. It helps organisations reach and monitor compliance with standards and laws.
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Why #7: Based in Dublin, Ireland, with an office in New York and European headquarters in France · Founded 2003, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
I
IDMWORKS
IT Services · Web Development · Web Design
IDMWORKS is an identity and access management consultancy headquartered in Miami, Florida.
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Why #8: Based in Miami, Florida · Founded 2004, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
I
Integrity360
IT Services · Web Development · Web Design · Also in Ireland
Integrity360 is a cyber security firm established in 2005. It runs security operations centres and offers a full range of security services to enterprise clients.
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Why #9: Office in United States of America · Founded 2005, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Malwarebytes
IT Services · Network Security · IT Security
Malwarebytes is a cybersecurity company whose software defends computers and business endpoints against malware, ransomware and exploits that traditional antivirus can miss.
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Why #10: Based in California, with offices in Europe and Asia · Founded 2008, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
SentinelOne
IT Services · Software Development · Web Security · Also in Canada
SentinelOne is a cybersecurity company that sells an AI-based platform covering endpoints, identity, cloud and data.
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Why #11: Based in Mountain View, Tel Aviv and Tokyo · Founded 2013, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
Optiv Security Inc.
E-Commerce Development · Software Development · Cybersecurity
Optiv Security Inc. is a cybersecurity solutions provider formed in 2015 by the merger of Accuvant and FishNet Security.
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Why #12: Address in United States of America · Founded 2015, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
Crypteia Networks, a PCCW Global company
IT Services · Web Development · Software Development · Also in Greece
Crypteia Networks is a security company, described as part of PCCW Global.
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Why #13: Based in Athens, Greece, with offices in Boston, Massachusetts · ISO 9001, ISO 27001, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
OI
Onapsis Inc.
IT Services · Web Development · E-Commerce Development
Onapsis Inc. is a cybersecurity company that protects business-critical SAP and Oracle applications.
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Why #14 (shared): Based in Boston, Massachusetts · Client numbers stated on its own website, as stated on its own website, read 6 Oct 2026
Not yet on record: client reviews, vetting.
Netwrix Corporation
IT Services · Web Development · Web Design
Netwrix Corporation develops cybersecurity software that unifies data security and identity security.
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Why #14 (shared): Address in United States of America · Client numbers stated on its own website, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.
Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
Paladion
Mobile App Development · Web Development · iOS App
Paladion is a managed security service provider with more than a decade of experience, working with organisations across Asia, the US and EMEA. Its stated priority is IT security.
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On record: In business 10+ years · Client numbers stated on its own website, as stated on its own website, read 6 Oct 2026
SecurityScorecard
IT Services · Web Security · IT Security
SecurityScorecard rates the cybersecurity of companies from outside their networks. Customers use the ratings to watch their own exposure and that of suppliers.
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On record: SOC 2 · Client numbers stated on its own website, as stated on its own website, read 6 Oct 2026
SonicWall
IT Services · iOS App · Network Security
SonicWall is a cybersecurity vendor that sells through partners.
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On record: In business 30+ years, as stated on its own website, read 5 Oct 2026
FC
Fidelis Cybersecurity
IT Services · E-Commerce Development · Network Security
Fidelis Cybersecurity sells threat detection and response products to large organisations.
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On record: In business 20+ years, as stated on its own website, read 6 Oct 2026
KS
Keeper Security, Inc.
IT Services · Web Development · Web Design
Keeper Security, Inc. makes identity and password security software.
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On record: ISO 27001, SOC 2, professional accreditation, as stated on its own website, read 6 Oct 2026
MobileIron
Mobile App Development · iOS App · E-Commerce Development
MobileIron was a mobile security and unified endpoint management company founded in 2007. It checked users, devices, apps and networks before letting them reach business data.
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On record: Founded 2007, as stated on its own website, read 6 Oct 2026
TS
TBG Security
IT Services · Web Development · Web Design
TBG Security is a cybersecurity consultancy that helps organisations meet regulatory requirements and reduce the risk of a breach.
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On record: In business 15+ years, as stated on its own website, read 6 Oct 2026
Bastille
Mobile App Development · Web Development · PHP
Bastille is a cybersecurity company, founded in 2014, that detects and locates wireless devices in an organisation's airspace.
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On record: Founded 2014, as stated on its own website, read 6 Oct 2026
Pulse Secure
Mobile App Development · IT Services · Web Development
Pulse Secure was a supplier of secure network access software for businesses and service providers.
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On record: Founded 2014, as stated on its own website, read 5 Oct 2026

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Everything here links back to the same verified catalogue. Pick your next stop.

Top Cybersecurity Companies in the USA

Qualys

Bit by Bit Computer Consultants

SECUDE

Optimum-web

TDI (Tetrad Digital Integrity)

Proofpoint

VigiTrust

IDMWORKS

Integrity360

Malwarebytes

SentinelOne

Optiv Security Inc.

Crypteia Networks, a PCCW Global company

Onapsis Inc.

Netwrix Corporation

Paladion

SecurityScorecard

SonicWall

Fidelis Cybersecurity

Keeper Security, Inc.

MobileIron

TBG Security

Bastille

Pulse Secure

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