TENB: Leadership change · Company disclosure

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On October 5, 2026, upon the recommendation of its Nominating and Corporate Governance Committee, the Board of Directors (the “ Board ”) of Tenable Holdings, Inc. (the “ Company ”) approved an increase in the size of the Board from 10 to 11 directors, and appointed Charles Bell to serve as a director of the Company, effective October 5, 2026. Mr. Bell will serve as a Class III director whose term will expire at the 2027 Annual Meeting of Stockholders, and he has been appointed to serve as a member of the Cybersecurity Risk Management Committee of the Board (“ Cybersecurity Committee ”). There is no arrangement or understanding between Mr. Bell and any other person pursuant to which he was selected as a director of the Company, and there is no family relationship between Mr. Bell and any of the Company’s other directors or executive officers. The Company is not aware of any transaction involving Mr. Bell requiring disclosure under Item 404(a) of Regulation S-K. Additional information about Mr. Bell is set forth below: Charles Bell, age 68, currently serves as Executive Vice President, Engineer, at Microsoft Corporation (“ Microsoft ”), a position he has held since February 2026. He previously served as Executive Vice President, Security, Compliance, Identity, and Management at Microsoft from September 2021 to February 2026. Prior to joining Microsoft, Mr. Bell spent more than two decades at Amazon.com, Inc., where he served in several roles, including Senior Vice President of Amazon Web Services. Earlier in his career, Mr. Bell began as an engineer at The Boeing Company, working on the Space Shuttle program, before j