Company: TENB
Filing Date: 2025-02-24
Form Type: S-8
Source: 0001660280-25-000035
Chunk: 1

Company: Tenable Holdings, Inc.
Filing Date: 2025-02-24
Form: S-8
Chunk 1
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| Emerging growth company                                                                                                                                                                                                                                     |     | o |     | Smaller reporting company |     | o |
| If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.o |     |   |     |                           |     |   |

### REGISTRATION OF ADDITIONAL SHARES

### PURSUANT TO GENERAL INSTRUCTION E
Pursuant to General Instruction E of Form S-8, Tenable Holdings, Inc. (the “

#### Registrant
”) is filing this Registration Statement with the Securities and Exchange Commission (the “

#### Commission
”) to register (1) 5,984,902 additional shares of its common stock under the 2018 Equity Incentive Plan (the "

#### 2018 Plan
"), pursuant to the provisions of the 2018 Plan providing for an automatic increase in the number of shares common stock reserved and available for issuance under the 2018 Plan on January 1, 2025 and (2) 1,795,470 additional shares of its common stock under the 2018 Employee Stock Purchase Plan (the "

#### 2018 ESPP
"), pursuant to the provisions of 2018 ESPP providing for an automatic increase in the number of shares of common stock reserved and available for issuance under the 2018 ESPP on January 1, 2025. In accordance with the instructional note to Part I of Form S-8 as promulgated by the Commission, the information specified by Part I of the Form S-8 has been omitted from this Registration Statement.

The Registrant previously registered shares of its common stock for issuance under the 2018 Plan and the 2018 ESPP on a Registration Statement on Form S-8 filed with the Commission on July 26, 2018 (File No. 333-226347), and subsequent Registration Statements on Form S-8 filed with the Commission on March 1, 2019 (File No. 333-230040), February 28, 2020 (File No. 333-236759), February 23, 2021 (File No. 333-253376), February 25, 2022 (File No. 333-263050), February 24, 2023 (