Tenable, Inc.

Tenable Holdings, Inc.

Company type	Public
Industry	Cybersecurity software
Predecessor	Tenable Network Security, Inc.
Founded	September 2002 (2002-09)
Founder	Ron Gula, Jack Huffard, Renaud Deraison
Headquarters	Columbia , United States
Area served	Worldwide
Key people	Amit Yoran (former CEO), Stephen Vintz (interim co-CEO), Mark Thurmond (interim co-CEO), Art Coviello (chairman)
Products	Nessus vulnerability scanner, Tenable One exposure management platform
Website	www.tenable.com

Tenable Holdings, Inc. operates as a cybersecurity firm based in Columbia, Maryland. Its premier offering, the vulnerability scanning software Nessus, originally created in 1998, ranks among the most extensively adopted tools within the cybersecurity sector. By December 31, 2023, Tenable supported nearly 44,000 clients, encompassing 65% of the Fortune 500 companies.

History

Established in September 2002 under the name Tenable Network Security, Inc., the company was founded by Ron Gula, Jack Huffard, and Renaud Deraison. The founders incorporated Deraison's Nessus vulnerability scanner into the company's product lineup. Ron Gula, an entrepreneur with a background at the National Security Agency, co-founded Tenable following the sale of a previous business. In 2004, cybersecurity specialist Marcus J. Ranum joined Tenable as chief security officer. To increase revenue streams and reduce competition, Nessus shifted from an open-source model to proprietary software in October 2005; this change prompted the development of OpenVAS as an open-source alternative.

In September 2012, Tenable raised $50 million during its Series A funding round led by Accel Partners, and formed a collaboration with In-Q-Tel to deliver cybersecurity solutions to the U.S. Intelligence Community. A subsequent Series B financing round secured $250 million in 2015 with Insight Partners as the lead investor. Founder Ron Gula resigned as CEO in 2016 to assume the role of chairman. Amit Yoran was appointed CEO in January 2017, coinciding with the company's rebranding to Tenable, Inc. The firm went public on NASDAQ through an initial public offering in July 2018.

October 2022 saw the introduction of Tenable One, an exposure management platform that augmented the company’s product offerings. In January 2023, Tenable broadened its strategic focus by launching a $25 million venture capital fund aimed at investing in promising cybersecurity startups.

In December 2024, CEO Amit Yoran took a medical leave due to cancer; during this period, CFO Stephen Vintz and COO Mark Thurmond served as interim co-CEOs. Yoran passed away in January 2025 at age 54. Subsequently, Art Coviello was appointed chairman. That same month, Tenable acquired Vulcan Cyber for $150 million, reinforcing its market position and expanding its product portfolio.

Acquisitions

#	Year	Company	Price	Description
1	October 2016	FlawCheck	Undisclosed	Cybersecurity enterprise
2	December 2019	Indegy	$78 million	Operational technology firm based in Israel
3	April 2021	Alsid	$98 million	Software specializing in identifying security vulnerabilities within Active Directory environments
4	October 2021	Accurics	$160 million	Security platform designed for cloud-native DevOps and security teams
5	June 2022	Bit Discovery	$45 million	Startup focused on attack surface management software
6	October 2023	Ermetic	$240 million cash plus $25 million in stock and RSUs	Israeli startup offering cloud-native application protection solutions
7	June 2024	Eureka	Undisclosed	Company specializing in data security posture management
8	January 2025	Vulcan Cyber	$150 million	Platform for managing exposure risk