X0206 3 2018-07-25 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 Employee Stock Option (right to buy) 4.15 2026-05-31 Common Stock 200000 D Employee Stock Option (right to buy) 5.96 2027-06-26 Common Stock 225000 D Employee Stock Option (right to buy) 16.21 2028-06-21 Common Stock 116162 D 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. 25% of the shares underlying the option vested on June 26, 2018, with the remainder vesting in three 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. 25% of the shares underlying the option vest in equal monthly installments over the twelve-month period beginning on the second anniversary of June 21, 2018, and ending on the third anniversary, with the remainder vesting monthly over the twelve-month period thereafter, subject to the reporting person's continuous service with the Issuer as of each vesting date, and subject to accelerated vesting in specified circumstances. Exhibit List - Exhibit 24.1 - Power of Attorney /s/ Brian F. Leaf, Attorney-in-Fact 2018-07-25