# EDGAR Filing Document

**Accession Number:** 0001660280
**File Stem:** 0001660280-26-000007
**Filing Date:** 2026-2
**Character Count:** 22454
**Document Hash:** 4b45dd7da28b216b380c6ba388e1b573
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001660280-26-000007.hdr.sgml**: 20260227

**ACCESSION NUMBER**: 0001660280-26-000007

**CONFORMED SUBMISSION TYPE**: S-8

**PUBLIC DOCUMENT COUNT**: 15

**REFERENCES 429**: 333-226347

**REFERENCES 429**: 333-230040

**REFERENCES 429**: 333-236759

**REFERENCES 429**: 333-253376

**REFERENCES 429**: 333-263050

**REFERENCES 429**: 333-270021

**REFERENCES 429**: 333-277466

**REFERENCES 429**: 333-285153

**FILED AS OF DATE**: 20260227

**DATE AS OF CHANGE**: 20260227

**EFFECTIVENESS DATE**: 20260227

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Tenable Holdings, Inc.
- **CENTRAL INDEX KEY:** 0001660280
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-PREPACKAGED SOFTWARE [7372]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 475580846
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** S-8
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-293880
- **FILM NUMBER:** 26701571

**BUSINESS ADDRESS:**
- **STREET 1:** 6100 MERRIWEATHER DRIVE
- **CITY:** COLUMBIA
- **STATE:** MD
- **ZIP:** 21044
- **BUSINESS PHONE:** 410-872-0555

**MAIL ADDRESS:**
- **STREET 1:** 6100 MERRIWEATHER DRIVE
- **CITY:** COLUMBIA
- **STATE:** MD
- **ZIP:** 21044

---

| | |
|:---|:---|
| **As filed with the U.S. Securities and Exchange Commission on February 27, 2026** | **Registration No. 333-** |

---

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**__________________________**

**FORM S-8**

**REGISTRATION STATEMENT**

UNDER

THE SECURITIES ACT OF 1933

**__________________________**

**TENABLE HOLDINGS, INC.**

**(Exact name of registrant as specified in its charter)**

**__________________________**

---

| | |
|:---|:---|
| **Delaware** | **47-5580846** |
| (State or other jurisdiction of incorporation or organization) | (I.R.S. Employer Identification Number) |

---

**6100 Merriweather Drive**

**Columbia, Maryland, 21044**

**(410) 872-0555**

(Address of principal executive offices, including zip code)

**Tenable Holdings, Inc. 2018 Equity Incentive Plan**

**Tenable Holdings, Inc. 2018 Employee Stock Purchase Plan**

(Full titles of the plans)

**__________________________**

**Stephen A. Vintz**

**Co-Chief Executive Officer and Director**

**Tenable Holdings, Inc.**

**6100 Merriweather Drive**

**Columbia, Maryland 21044**

**(410) 872-0555**

(Name and address of agent for service) (Telephone number, including area code, of agent for service)

---

| | |
|:---|:---|
| Copies to: | Copies to: |
| **Jon C. Avina** | **Michelle VonderHaar** |
| **Madison A. Jones** | **Tenable Holdings, Inc.** |
| **Cooley LLP** | **6100 Merriweather Drive** |
| **3175 Hanover Street** | **Columbia, Maryland 21044** |
| **Palo Alto, California 94304** | |

---

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

---

| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | 🗷 | Accelerated filer | □ |
| Non-accelerated filer | □ | | |
| Emerging growth company | □ | Smaller reporting company | □ |
| 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. □ | 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. □ | 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. □ | 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. □ |

---

------

**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) 5,922,499 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 of common stock reserved and available for issuance under the 2018 Plan on January 1, 2026 and (2) 1,776,749 additional shares of its common stock under the 2018 Employee Stock Purchase Plan (the "***2018 ESPP***"), pursuant to the provisions of the 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, 2026. 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 (File No. 333-270021), February 28, 2024 (File No. 333-277466), and February 24, 2025 (File No. 333-285153). Pursuant to General Instruction E to Form S-8, this Registration Statement hereby incorporates by reference the contents of the Registration Statements referenced above except to the extent supplemented, amended or superseded by the information set forth herein.

**PART II**

**Item 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Incorporation of Certain Documents by Reference**

The following documents filed by the Registrant with the Commission are incorporated by reference into this Registration Statement:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a.The Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the Commission on February 27, 2026.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b.All other reports of the Registrant filed pursuant to Sections 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the "***Exchange Act***") since the end of the fiscal year covered by the Registrant's Annual Report referred to in (b) above (other than Current Reports furnished under Item 2.02 or Item 7.01 of Form 8-K and exhibits furnished on such form that relate to such items).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c.The description of the Registrant's common stock which is contained in Exhibit 4.3 in the Registrant's Annual Report on Form 10-K for the year ended December 31, 2019, filed on February 28, 2020, including any amendment or report filed with the Commission for the purpose of updating such description.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d.All other reports and documents subsequently filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act (other than Current Reports furnished under Item 2.02 or Item 7.01 of Form 8-K and exhibits furnished on such form that relate to such items) on or after the date of this Registration Statement and prior to the filing of a post-effective amendment to this Registration Statement which indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference herein and to be a part of this Registration Statement from the date of the filing of such reports and documents. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document that also is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

------

**Item 8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Exhibits**

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| | | **Incorporated by Reference** | **Incorporated by Reference** | **Incorporated by Reference** | **Incorporated by Reference** |
|<br>**Exhibit Number** |<br>**Description** | **Schedule Form** | **File Number** | **Exhibit** | **Filing Date** |
| 4.1 | <u>[Amended and Restated Certificate of Incorporation of the Registrant, as currently in effect](https://www.sec.gov/Archives/edgar/data/1660280/000119312518231446/d562353dex31.htm)</u> | 8-K | 001-38600 | 3.1 | July 30, 2018 |
| 4.2 | <u>[Second Amended and Restated Bylaws of the Registrant, as currently in effect](https://www.sec.gov/Archives/edgar/data/1660280/000166028023000147/ex31.htm)</u> | 8-K | 001-38600 | 3.1 | November 15, 2023 |
| 4.3 | <u>[Form of Common Stock Certificate of the Registrant](https://www.sec.gov/Archives/edgar/data/1660280/000119312518218215/d548092dex41.htm)</u> | S-1/A | 333-226002 | 4.1 | July 16, 2018 |
| 5.1\* | <u>[Opinion of Cooley LLP](a022726exhibit51.htm)</u> |  |  |  |  |
| 23.1\* | <u>[Consent of Ernst & Young LLP, independent registered public accounting firm](a022726exhibit231.htm)</u> |  |  |  |  |
| 23.2\* | <u>[Consent of Cooley LLP (included in Exhibit 5.1)](a022726exhibit51.htm)</u> |  |  |  |  |
| 24.1\* | <u>[Power of Attorney (included on the signature page of this Form S-8)](#ie223e1e8b1f244ffa28c18d32db8d034_10)</u> |  |  |  |  |
| 99.1 | <u>[2018 Equity Incentive Plan and Forms of Stock Option Grant Notice and Agreement and Restricted Stock Unit Grant Notice and Agreement thereunder](https://www.sec.gov/Archives/edgar/data/1660280/000119312518226924/d494510dex104.htm)</u> | S-8 | 333-226347 | 10.4 | July 26, 2018 |
| 99.2 | <u>[Form of Restricted Stock Unit Grant Notice and Agreement under the 2018 Equity Incentive Plan](https://www.sec.gov/Archives/edgar/data/1660280/000166028023000144/q32023exhibit101.htm)</u> | 10-Q | 001-38600 | 10.2 | August 2, 2023 |
| 99.3 | <u>[Form of Restricted Stock Unit Grant Notice and Agreement under the 2018 Equity Incentive Plan](https://www.sec.gov/Archives/edgar/data/1660280/000166028023000144/q32023exhibit101.htm)</u> | 10-Q | 001-38600 | 10.1 | November 9, 2023 |
| 99.4 | <u>[2018 Employee Stock Purchase Plan](https://www.sec.gov/Archives/edgar/data/1660280/000119312518226924/d494510dex105.htm)</u> | S-8 | 333-226347 | 10.5 | July 26, 2018 |
| 99.5 | <u>[Form of Performance Restricted Stock Unit Grant Notice and Agreement](https://www.sec.gov/Archives/edgar/data/1660280/000166028022000039/ex101performancevestrsuagr.htm)</u> | 8-K | 001-38600 | 10.1 | February 28, 2022 |
| 107\* | <u>[Filing Fee Table](exfilingfees.htm)</u> |  |  |  |  |

---

___________

\*&nbsp;&nbsp;&nbsp;&nbsp;Filed herewith

------

**SIGNATURES**

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Columbia, Maryland, on February 27, 2026.

---

| | |
|:---|:---|
| **TENABLE HOLDINGS, INC.** | **TENABLE HOLDINGS, INC.** |
| By: | /s/ Matthew Brown |
|  | Matthew Brown |
|  | *Chief Financial Officer* |
|  | *(Principal Financial Officer)* |

---

------

**POWER OF ATTORNEY**

**KNOW ALL PERSONS BY THESE PRESENTS**, that each person whose signature appears below constitutes and appoints Stephen A. Vintz, Matthew Brown and J. Barron Anschutz, and each or any one of them, as his or her true and lawful attorney-in-fact and agent, each with the full power of substitution and resubstitution, for him or her and in their name, place or stead, in any and all capacities, to sign any and all amendments to this Registration Statement (including post-effective amendments), and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-fact and agent, and each or any of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or his, her or their substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

---

| | | |
|:---|:---|:---|
| **Signature** | **Title** | **Date** |
| /s/ Stephen A. Vintz | Co-Chief Executive Officer and Director | February 27, 2026 |
| Stephen A. Vintz | *(Principal Executive Officer)* |  |
| /s/ Mark C. Thurmond | Co-Chief Executive Officer and Director | February 27, 2026 |
| Mark C. Thurmond |  |  |
| /s/ Matthew Brown | Chief Financial Officer | February 27, 2026 |
| Matthew Brown | *(Principal Financial Officer)* |  |
| /s/ J. Barron Anschutz | Chief Accounting Officer | February 27, 2026 |
| J. Barron Anschutz | *(Principal Accounting Officer)* |  |
| /s/ Arthur W. Coviello, Jr. | Chairman of the Board | February 27, 2026 |
| Arthur W. Coviello, Jr. |  |  |
| /s/ Linda Zecher Higgins | Director | February 27, 2026 |
| Linda Zecher Higgins |  |  |
| /s/ Niloofar Razi Howe | Director | February 27, 2026 |
| Niloofar Razi Howe |  |  |
| /s/ John C. Huffard, Jr. | Director | February 27, 2026 |
| John C. Huffard, Jr. |  |  |
| /s/ Margaret Keane | Director | February 27, 2026 |
| Margaret Keane |  |  |
| /s/ A. Brooke Seawell | Director | February 27, 2026 |
| A. Brooke Seawell |  |  |
| /s/ George Alexander Tosheff | Director | February 27, 2026 |
| George Alexander Tosheff |  |  |
| /s/ Raymond Vicks, Jr. | Director | February 27, 2026 |
| Raymond Vicks, Jr. |  |  |

---

## Ex-Filing

?xml version='1.0' encoding='ASCII'? exfilingfees

**Exhibit 107**

**CALCULATION OF FILING FEE TABLE**

**FORM S-8**

(Form Type)

**TENABLE HOLDINGS, INC.**

(Exact Name of Registrant as Specified in its Charter)

---

| | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| **Security Type** | **Security Class Title** | **Fee Calculation Rule** | **Amount Registered**<sup>(1)</sup> | **Amount Registered**<sup>(1)</sup> | **Proposed Maximum Offering Price per Share** | **Proposed Maximum Offering Price per Share** | **Maximum Aggregate Offering Price** | **Fee Rate** | **Amount of Registration Fee** |
| Equity | Common Stock, par value $0.01 per share,<br>**2018 Equity Incentive Plan** | Other<sup>(2)</sup> | 5922499 | (3) | 18.08 | (2) | $107078781.92 | 0.0001381 | $14787.58 |
| Equity | Common Stock, par value $0.01 per share,<br>**2018 Employee Stock Purchase Plan** | Other<sup>(4)</sup> | 1776749 | (5) | 15.37 | (4) | $27308632.13 | 0.0001381 | $3771.33 |
|  | Total Offering Amounts |  |  |  |  |  | $134387414.05 |  | $18558.91 |
|  | Total Fee Offsets |  |  |  |  |  |  |  |  |
|  | &nbsp;&nbsp;Net Fee Due |  |  |  |  |  |  |  | $18558.91 |

---

(1)Pursuant to Rule 416(a) promulgated under the Securities Act of 1933, as amended (the "***Securities Act***"), this Registration Statement shall also cover any additional shares of common stock of Tenable Holdings, Inc. (the "***Registrant***") that become issuable under the plans set forth herein by reason of any stock dividend, stock split, recapitalization, or other similar transaction effected that results in an increase to the number of outstanding shares of Registrant's common stock.

(2)&nbsp;&nbsp;&nbsp;&nbsp;Estimated in accordance with Rule 457(c) and (h) solely for purposes of calculating the registration fee on the basis of $18.08, the average of the high and low prices of the Registrant's common stock as reported on the Nasdaq Global Select Market on February 24, 2026.

(3)&nbsp;&nbsp;&nbsp;&nbsp;Represents an automatic annual increase equal to 5% of the total number of shares of the Registrant's capital stock outstanding on December 31<sup>st</sup> of the preceding calendar year to the aggregate number of shares of the Registrant's common stock reserved for issuance under, and which annual increase is provided by, the Registrant's 2018 Equity Incentive Plan.

(4)&nbsp;&nbsp;&nbsp;&nbsp;Estimated in accordance with Rule 457(c) and (h) solely for the purpose of calculating the registration fee on the basis of $15.37, the average of the high and low prices of the Registrant's common stock as reported on the Nasdaq Global Select Market on February 24, 2026, multiplied by 85%, which is the percentage of the price per share applicable to purchases under the 2018 Employee Stock Purchase Plan (the "***2018 ESPP***").

(5)&nbsp;&nbsp;&nbsp;&nbsp;Represents an automatic increase equal to 1.5% of the total number of shares of the Registrant's capital stock outstanding on December 31<sup>st</sup> of the preceding calendar year to the aggregate number of shares of the Registrant's common stock reserved for issuance under, and which annual increase is provided by, the 2018 ESPP.

## Exhibit 5.1

![cooleya04.jpg](cooleya04.jpg)

Madison A. Jones

+1 202 728 7087

madison.jones@cooley.com

February 27, 2026

Tenable Holdings, Inc.

6100 Merriweather Drive

Columbia, MD 21044

**Re: Registration on Form S-8**

Ladies and Gentlemen:

We have acted as counsel to Tenable Holdings, Inc., a Delaware corporation (the "**Company**"), in connection with the filing of a Registration Statement on Form S-8 (the "**Registration Statement**") with the Securities and Exchange Commission (the "***Commission***"), covering the offering of up to 7,699,248 shares (the "***Shares***") of the Company's common stock, par value $0.01 per share (the "***Common Stock***") consisting of (a) 5,922,499 shares of Common Stock issuable pursuant to the Company's 2018 Equity Incentive Plan (the "***2018 EIP***") and (b) 1,776,749 shares of Common Stock issuable pursuant to the Company's 2018 Employee Stock Purchase Plan (together with the 2018 EIP, the "**Plans**").

In connection with this opinion, we have examined and relied upon (a) the Registration Statement and the related prospectuses, (b) the Company's certificate of incorporation and bylaws, each as currently in effect, (c) the Plans and (d) such other records, documents, opinions, certificates, memoranda and instruments as in our judgment are necessary or appropriate to enable us to render the opinion expressed below. We have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity to originals of all documents submitted to us as copies, the accuracy, completeness and authenticity of certificates of public officials, and the due authorization, execution and delivery of all documents by all persons other than the Company. As to certain factual matters, we have relied upon a certificate of an officer of the Company and have not independently verified such matters.

Our opinion is expressed only with respect to the General Corporation Law of the State of Delaware. We express no opinion to the extent that any other laws are applicable to the subject matter hereof and express no opinion and provide no assurance as to compliance with any federal or state securities law, rule or regulation.

On the basis of the foregoing, and in reliance thereon, we are of the opinion that the Shares, when sold and issued in accordance with the Plans, the Registration Statement and the related prospectuses, will be validly issued, fully paid, and nonassessable (except as to Shares issued pursuant to deferred payment arrangements, which will be fully paid and nonassessable when such deferred payments are made in full).

This opinion is limited to the matters expressly set forth in this letter, and no opinion should be implied, or may be inferred, beyond the matters expressly stated. This opinion speaks only as to law and facts in effect or existing as of the date hereof, and we have no obligation or responsibility to update or supplement this opinion to reflect any facts or circumstances that may hereafter come to our attention or any changes in law that may hereafter occur.

We consent to the filing of this opinion as an exhibit to the Registration Statement. In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Commission thereunder.

Sincerely,

Cooley LLP

By: <u>/s/ Madison A. Jones</u> 

Madison A. Jones

## Exhibit 23.1

**Exhibit 23.1**

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Tenable Holdings, Inc. 2018 Equity Incentive Plan and the Tenable Holdings, Inc. 2018 Employee Stock Purchase Plan of our reports dated February 27, 2026, with respect to the consolidated financial statements and schedule of Tenable Holdings, Inc. and the effectiveness of internal control over financial reporting of Tenable Holdings, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2025, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Baltimore, Maryland

February 27, 2026

<br>