X0306 4 2019-02-08 0 0001660280 Tenable Holdings, Inc. TENB 0001747310 Riddick Stephen A C/O TENABLE HOLDINGS, INC. 7021 COLUMBIA GATEWAY DRIVE, SUITE 500 COLUMBIA MD 21046 0 1 0 0 General Counsel & Secretary Common Stock 2019-02-08 4 M 0 25000 4.15 A 25000 D Common Stock 2019-02-08 4 S 0 24600 26.52 D 400 D Common Stock 2019-02-08 4 S 0 400 26.99 D 0 D Employee Stock Option (right to buy) 4.15 2019-02-08 4 M 0 25000 0.00 D 2026-05-31 Common Stock 25000 175000 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.96 to $26.95 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) and (3) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.98 to $27.00 inclusive. 50% of the shares underlying the option vested on May 31, 2018, with the remainder vesting in two equal annual installments thereafter, subject to the reporting person's continuous service with the Issuer as of the applicable vesting date, and subject to accelerated vesting in specified circumstances. /s/ Brian F. Leaf, Attorney-in-Fact 2019-02-12