Tenable Holdings: appoints Charles Bell to board

What happened

• The filing says that on Oct 5, 2026 the board approved an increase in the size of the board from 10 to 11 directors and appointed Charles Bell to serve as a director, effective Oct 5, 2026. Mr. Bell will serve as a Class III director with a term expiring at the 2027 Annual Meeting of Stockholders and was appointed to the cybersecurity risk management committee.

Key details

• Upon commencement of service on Oct 5, 2026 the board granted Mr. Bell 10,386 restricted stock units (RSUs) that vest in three equal annual installments on each anniversary of the grant date, subject to continued service and accelerated vesting in specified circumstances.
• The board approved prorated cash retainers for Mr. Bell for 2026: board service retainer of $35,000 and cybersecurity committee member service retainer of $5,000. Mr. Bell entered the company’s standard form of indemnification agreement.
• The filing describes Mr. Bell as age 68, currently Executive Vice President, Engineer at Microsoft since Feb 2026, previously Executive Vice President, Security, Compliance, Identity, and Management at Microsoft from Sep 2021 to Feb 2026, and more than two decades at Amazon.com, Inc., including roles such as Senior Vice President of Amazon Web Services; he has served on the board of Twilio Inc. since Mar 2023 and holds a B.S. in Business Administration and Computer Science from California State University, Fullerton.
• The filing also says that on Oct 6, 2026 Tenable issued a press release about the appointment, furnished as Exhibit 99.1 under Item 7.01.

Why it may matter

• This Form 8-K reports Item 5.02 (departure of directors or certain officers; election of directors) and Item 7.01 (Regulation FD disclosure). Item 5.02 covers changes to the board and director appointments; Item 7.01 covers public disclosures such as press releases. This filing does not show why the insider traded or why the company acted.