The 27 largest cybersecurity companies in Boston (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	Rapid7 rapid7.com Global leader in AI-powered managed cybersecurity operations, advancing organizations' cyber resilience through integrating security data, AI, and threat intelligence to reduce risk and disrupt attackers.	Computer and Network Security	🇺🇸 Boston	3,268	n/a
2	ECI eci.com A global leader in technology solutions for the financial industry, empowering organizations worldwide to achieve new performance levels through innovative technology With offices globally	IT Services and IT Consulting	🇺🇸 Boston	1,916	1995
3	Snyk snyk.io Empowering organizations to build fast, stay secure, unleashing developer productivity, reducing business risk, accelerating secure software delivery, innovating without limits.	Computer and Network Security	🇺🇸 Boston	1,557	n/a
4	Aura aura.com A mission-driven technology company focused on creating a safer internet for all, providing comprehensive digital security services trusted by millions worldwide	Software Development	🇺🇸 Boston	1,274	2017
5	Bitsight bitsight.com Provides precise insights from extensive cybersecurity data, enabling organizations to identify vulnerabilities, detect threats, and manage risks across their attack surface.	Software Development	🇺🇸 Boston	736	n/a
6	LastPass lastpass.com Helps individuals and organizations manage, protect access to AI, applications, and credentials from the browser, minimizing risk and ensuring productivity.	Computer and Network Security	🇺🇸 Boston	712	2008
7	OneSpan onespan.com Builds secure digital experiences and agreements using cybersecurity and e-signature solutions, protecting identities, mobile apps, and streamlining workflows for global enterprises.	Software Development	🇺🇸 Boston	667	n/a
8	Lookout lookout.com Secures mobile-driven enterprises by providing deep visibility into mobile endpoints, applications, network traffic, and AI interactions to detect threats and protect sensitive data.	Computer and Network Security	🇺🇸 Boston	515	2007
9	IANS iansresearch.com IANS Research provides practical security insights for CISOs and their teams through experienced practitioners, tools, consulting, and peer community support	Computer and Network Security	🇺🇸 Boston	505	2001
10	Tufin tufin.com AI-powered control plane for visualizing, managing, and automating security and compliance across hybrid network environments, including firewalls, cloud, SASE, SD-WAN, and microsegmentation.	Computer and Network Security	🇺🇸 Boston	504	2005
11	Devo devo.com Delivers a real-time security data platform, including data-powered threat detection, automated case management, autonomous investigations, and threat hunting, to enhance security operations.	Computer and Network Security	🇺🇸 Boston	500	2011
12	Continuum continuum.net Provides a proactive platform with integrated services for managed service providers, spanning security, backup, and monitoring, to help them grow.	Software Development	🇺🇸 Boston	457	2005
13	Proof proof.com Helps businesses instantly and securely verify people, agreements, and transactions, powering identity verification, notarization, and fraud prevention across various industries.	Software Development	🇺🇸 Boston	414	n/a
14	Onapsis onapsis.com Provides leading organizations with a platform for automated compliance, vulnerability management, threat detection, and secure development for their SAP applications.	Computer and Network Security	🇺🇸 Boston	340	2009
15	Cynet Security cynet.com All-in-one cybersecurity platform providing unified protection, detection, and expert support tailored for small-to-medium enterprises and MSPs.	Computer and Network Security	🇺🇸 Boston	334	2014
16	Mend.io mend.io A company offering an enterprise suite of application security tools to help build and manage proactive AppSec programs, fostering collaboration between dev and security teams	Software Development	🇺🇸 Boston	257	2011
17	NetWitness netwitness.com A global company offering scalable threat detection and response solutions with visibility, threat intelligence, analytics, and automation for efficient cybersecurity operations	Computer and Network Security	🇺🇸 Boston	196	1997
18	Immuta immuta.com This company enables organizations to securely access and protect their cloud data through sensitive data discovery, security controls, and data activity monitoring	Software Development	🇺🇸 Boston	195	2015
19	Black Kite blackkite.com Manages third-party cyber risk with AI, automating vendor monitoring and assessments, providing insights into ransomware, regulatory gaps, and financial exposure for proactive threat reduction.	Computer and Network Security	🇺🇸 Boston	167	2016
20	7AI 7ai.com AI-driven autonomous cybersecurity platform providing rapid, self-directed threat detection and response to protect against evolving cyber threats.	Computer and Network Security	🇺🇸 Boston	112	2024
21	Push Security pushsecurity.com Advanced browser security tool providing real-time detection, response, and visibility into user activity, attacker behavior, and browser-level risks.	Computer and Network Security	🇺🇸 Boston	102	2021
22	FireCompass firecompass.com Platform for autonomous penetration testing and red teaming across web, API, and infrastructure, discovering shadow assets and validating exploitable weaknesses.	Computer and Network Security	🇺🇸 Boston	99	2019
23	PreVeil preveil.com Specializing in encryption for CMMC & ITAR compliance, PreVeil offers encrypted email and file sharing with end-to-end security for businesses and personal use	Software Development	🇺🇸 Boston	81	2015
24	Ermetic, a Tenable company ermetic.com Tenable Cloud Security offers comprehensive solutions for AWS, Azure, and GCP environments, including asset discovery, risk analysis, threat detection, compliance, and remediation tools	Computer and Network Security	🇺🇸 Boston	81	2019
25	Tessian proofpoint.com A leading cloud email security platform using machine learning to protect organizations against advanced threats and data loss, while coaching on security awareness	Computer and Network Security	🇺🇸 Boston	41	2013
26	Abusix, Inc.abusix.com Email and network security solutions provider for ISPs, Telcos, Cloud & Hosting providers to combat email-borne threats and network abuse	Computer and Network Security	🇺🇸 Boston	25	2009
27	Proinf proinf.com A leading cybersecurity and professional services provider offering managed IT services, infrastructure engineering, security services, and application modernization with certified professionals	IT Services and IT Consulting	🇺🇸 Boston	16	2011

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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 2, 2026.

The 27 largest cybersecurity companies in Boston

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