X0306 4 2020-05-28 0 0001660280 Tenable Holdings, Inc. TENB 0001197652 SEAWELL A BROOKE C/O TENABLE HOLDINGS, INC. 7021 COLUMBIA GATEWAY DRIVE, SUITE 500 COLUMBIA MD 21046 1 0 0 0 Common Stock 30000 D Restricted Stock Units 2020-05-28 4 A 0 6677 0 A Common Stock 6677.0 6677 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of Issuer common stock. 100% of the shares underlying the RSUs vest on the earlier of May 28, 2021 or the Issuer's next annual shareholder meeting, 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/ David Bartholomew, Attorney-in-Fact 2020-06-01