144 0001197652 XXXXXXXX LIVE 0001660280 Tenable Holdings, Inc. 001-38600 6100 MERRIWEATHER DRIVE COLUMBIA MD 21044 410-872-0555 SEAWELL A BROOKE Director Common Rockefeller Capital Management

Two Embarcadero Center Suite 2320 San Francisco CA 94111

15000 462040.42 121100000 09/09/2025 NASDAQ Common 07/26/2018 Initial Public Offering TENB N 15000 07/26/2018 cash/check N Rosemary and A Brooke Seawell

6100 Merriweather DR Columbia ME 21044

TENB 09/04/2025 4622 139114.21 09/09/2025 Carmen Zamores as a duly authorized representative of National Financial Services LLC, as attorney-in-fact for SEAWELL A BROOKE