BlackRock, Inc. filed an amendment to Schedule 13G reporting beneficial ownership of 11,304,271 shares of Tenable Holdings Inc. common stock, representing 10.3% of the class as of 05/31/2026. The filing shows sole voting power over 11,114,148 shares and sole dispositive power over 11,304,271 shares. The amendment is signed by Spencer Fleming on 06/04/2026. The cover cites Reporting Business Units of BlackRock and clarifies holdings reflect aggregated business-unit ownership per SEC Release No. 34-39538.
Positive
None.
Negative
None.
Insights
BlackRock reports a >10% passive stake in Tenable using aggregated business-unit counts.
BlackRock's amendment lists 11,304,271 shares equal to 10.3% of the class as of 05/31/2026, with sole voting power on 11,114,148 shares. The filing follows Schedule 13G aggregation rules for passive institutional holdings under Release No. 34-39538.
Cash‑flow treatment and any trading intent are not stated in the excerpt; subsequent filings would disclose material changes in ownership or voting arrangements if they occur.
Key Figures
Beneficial ownership:11,304,271 sharesPercent of class:10.3%Sole voting power:11,114,148 shares+3 more
6 metrics
Beneficial ownership11,304,271 sharesas of 05/31/2026
Percent of class10.3%as of 05/31/2026
Sole voting power11,114,148 sharesItem 4 voting power disclosure
Sole dispositive power11,304,271 sharesItem 4 dispositive power disclosure
Cover page date05/31/2026reporting date on cover
Signature date06/04/2026signed by Spencer Fleming, Managing Director
Key Terms
Schedule 13G/A, Sole Dispositive Power, Reporting Business Units
3 terms
Schedule 13G/Aregulatory
"Amendment No. 2 and cover identifying the filing as Schedule 13G/A"
A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.
Sole Dispositive Powerfinancial
"Item 4 lists Sole power to dispose or to direct the disposition of: 11304271"
Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.
Reporting Business Unitsregulatory
"cover explains aggregation of holdings by certain business units per Release No. 34-39538"
BlackRock reports beneficial ownership of 11,304,271 shares of Tenable common stock, representing 10.3% of the class as of 05/31/2026. The filing aggregates holdings of Reporting Business Units under SEC Release No. 34-39538.
How much voting power does BlackRock hold in Tenable?
The amendment shows BlackRock has sole voting power over 11,114,148 shares and sole dispositive power over 11,304,271 shares, as reported on the cover page and Item 4 of the filing.
What type of SEC filing is this for TENB?
This is an amendment to a Schedule 13G (13G/A), a passive investor ownership report. It documents beneficial ownership and voting/dispositive powers without asserting an activist intent or transaction terms.
Who signed the Schedule 13G/A amendment for BlackRock?
The amendment is signed by Spencer Fleming, listed as Managing Director, with the signature date shown as 06/04/2026 on the filing excerpt.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 2)
TENABLE HOLDINGS INC
(Name of Issuer)
Common Stock
(Title of Class of Securities)
88025T102
(CUSIP Number)
05/31/2026
(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 Number(s):
88025T102
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
11,114,148.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
11,304,271.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
11,304,271.00
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)
10.3 %
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.:
88025T102
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
11304271
(b)
Percent of class:
10.3 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
11114148
(ii) Shared power to vote or to direct the vote:
0
(iii) Sole power to dispose or to direct the disposition of:
11304271
(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.
Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of TENABLE HOLDINGS INC. No one person's interest in the common stock of TENABLE HOLDINGS INC is more than five percent of the total outstanding common shares.
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.
