Tenable: BlackRock reports 17.5% ownership stake

BlackRock reports beneficial ownership of 17.5% of Tenable Holdings’ common stock, with full sole voting and dispositive power over the position.

Rhea-AI Filing Summary

Tenable Holdings, Inc. (TENB) received an amended Schedule 13G filing showing that BlackRock, Inc., through certain of its business units, reports beneficial ownership of 19,326,921 shares of Tenable common stock, representing 17.5% of the class.

BlackRock reports sole voting power over 19,143,175 shares and sole dispositive power over all 19,326,921 shares, with no shared voting or dispositive power. The filing notes that one underlying holder, iShares Core S&P Small-Cap ETF, has an interest in more than five percent of Tenable’s outstanding common stock.

Key Figures

Beneficially owned shares: 19,326,921 shares Percent of class: 17.5% Sole voting power: 19,143,175 shares +2 more

5 metrics

Beneficially owned shares 19,326,921 shares Common stock of Tenable Holdings, Inc. reported by BlackRock, Inc.

Percent of class 17.5% Proportion of Tenable Holdings, Inc. common stock beneficially owned by BlackRock

Sole voting power 19,143,175 shares Shares of Tenable common stock for which BlackRock reports sole voting power

Sole dispositive power 19,326,921 shares Shares of Tenable common stock for which BlackRock reports sole dispositive power

iShares Core S&P Small-Cap ETF interest threshold More than 5% of outstanding common stock Interest in Tenable common stock held through the ETF

Key Terms

beneficially owned, Sole Voting Power, dispositive power, Schedule 13G, +2 more

6 terms

beneficially owned financial

"reflects the securities beneficially owned, or deemed to be beneficially owned"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole Voting Power financial

"Sole Voting Power 19,143,175.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power financial

"Sole Dispositive Power 19,326,921.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Schedule 13G regulatory

"In accordance with SEC Release No. 34-39538 this reflects the securities"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Power of Attorney regulatory

"Exhibit 24: Power of Attorney"

A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.

investment company financial

"shareholders of an investment company registered under the Investment Company Act of 1940"

FAQ

How much of Tenable Holdings, Inc. (TENB) stock does BlackRock now report owning?

BlackRock, Inc. reports beneficial ownership of 19,326,921 shares of Tenable Holdings, Inc. common stock, representing 17.5% of the class, through certain of its business units and affiliates.

What voting power does BlackRock report over TENB shares?

BlackRock reports sole voting power over 19,143,175 shares of Tenable Holdings, Inc. common stock and no shared voting power, according to the amended Schedule 13G filing.

What dispositive power does BlackRock have over its TENB holdings?

BlackRock reports sole dispositive power over 19,326,921 shares of Tenable Holdings, Inc. common stock and no shared dispositive power, meaning its reporting business units control decisions to dispose of those shares.

Which underlying holder tied to BlackRock owns more than 5% of TENB?

The filing states that iShares Core S&P Small-Cap ETF has an interest in more than five percent of the total outstanding common stock of Tenable Holdings, Inc., through holdings managed within BlackRock’s reporting business units.

Who signed the amended Schedule 13G for BlackRock regarding TENB?

The amended Schedule 13G for Tenable Holdings, Inc. was signed by Spencer Fleming, identified as a Managing Director of BlackRock, Inc., dated September 4, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/04/2026 - 12:15 PM Accepted by SEC EDGAR 09/04/2026 - 12:15 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

TENABLE HOLDINGS INC

(Name of Issuer)

Common Stock

(Title of Class of Securities)

(CUSIP Number)

08/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP No.

1

Names of Reporting Persons

BlackRock, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 19,143,175.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 19,326,921.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

19,326,921.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

17.5 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: TENABLE HOLDINGS INC
(b)	Address of issuer's principal executive offices: 6100 MERRIWEATHER DRIVE COLUMBIA MD 21044
Item 2.
(a)	Name of person filing: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.:
Item 4.	Ownership
(a)	Amount beneficially owned: 19326921
(b)	Percent of class: 17.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 19143175
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 19326921
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The interest of 1 such person, iShares Core S&P Small-Cap ETF, in the common stock of TENABLE HOLDINGS INC is more than five percent of the total outstanding common stock.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	09/04/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7