Tenable Holdings, Inc. — Amendment to Schedule 13G
An amendment reports passive beneficial ownership positions held by Ameriprise Financial, Inc., Columbia Management Investment Advisers, LLC and Columbia Seligman Technology and Information Fund as of 05/31/2026. The filing lists shared voting and dispositive powers and states the Fund alone owned more than 5% of the class on that date.
Positive
None.
Negative
None.
Insights
Amendment documents passive holdings and voting/dispositive allocations as of 05/31/2026.
The filing shows shared voting and shared dispositive power allocations among reporting persons, with the Fund holding a >5% stake as of the stated date. This is a disclosure of positions, not an active trading event.
Timing is explicit: 05/31/2026. Subsequent filings will show any material changes in ownership or changes in power allocations.
"Amount beneficially owned: Incorporated by reference to Items (5)-(9)"
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.
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.
What ownership stake does Ameriprise report in TENB?
Ameriprise reports shared voting power of 13,536,242 shares and shared dispositive power of 15,063,544 shares as shown on the cover page for the reporting person.
Does Columbia Seligman Technology and Information Fund own more than 5% of TENB?
Yes. The filing states the Fund owned more than 5% of the class as of 05/31/2026, with 8,878,977 shares reported for that Fund.
Are the shares reported as sole or shared power for CMIA?
Columbia Management Investment Advisers, LLC reports 0 sole voting power and 13,536,242 shared voting power, with 14,056,072 shared dispositive power per the cover rows.
Who signed the Schedule 13G/A amendment for these holders?
The amendment is signed by Michael G. Clarke in roles including Senior Vice President and Chief Financial Officer, dated 06/05/2026.
Does this filing indicate active trading or a change in strategy?
This amendment reports passive beneficial ownership and allocations of voting/dispositive power; it does not disclose an active trading transaction or a change in investment strategy.
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
Ameriprise Financial, 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
0.00
6
Shared Voting Power
13,536,242.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
15,063,544.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
15,063,544.00
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)
13.7 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
CUSIP Number(s):
88025T102
1
Names of Reporting Persons
Columbia Management Investment Advisers, LLC
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
MINNESOTA
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
13,536,242.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
14,056,072.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
14,056,072.00
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)
12.7 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
CUSIP Number(s):
88025T102
1
Names of Reporting Persons
Columbia Seligman Technology and Information Fund
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
MASSACHUSETTS
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
8,878,977.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
8,878,977.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
8,878,977.00
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)
8.1 %
12
Type of Reporting Person (See Instructions)
IV
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:
(a) Ameriprise Financial, Inc. ("AFI")
(b) Columbia Management Investment Advisers, LLC ("CMIA")
(c) Columbia Seligman Technology and Information Fund ("Fund")
(b)
Address or principal business office or, if none, residence:
(a) 145 Ameriprise Financial Center, Minneapolis, MN 55474
(b) 290 Congress Street, Boston, MA 02210
(c) 290 Congress Street, Boston, MA 02210
(c)
Citizenship:
(a) Delaware
(b) Minnesota
(c) Massachusetts
(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:
Incorporated by reference to Items (5)-(9) and (11) of the cover page pertaining to each reporting person.
CMIA and AFI do not directly own any shares of Common Stock of the issuer. As the investment adviser to the Fund and various other unregistered and registered investment companies and other managed accounts, CMIA may be deemed to beneficially own the shares reported herein by the Fund. Accordingly, the shares reported herein by CMIA include those shares separately reported herein by the Fund.
As the parent holding company of CMIA, AFI may be deemed to beneficially own the shares reported herein by CMIA. Accordingly, the shares reported herein by AFI include those shares separately reported herein by CMIA.
Each of AFI and CMIA, and the subsidiaries identified on the attached Exhibit I, disclaims beneficial ownership of any shares reported on this Schedule.
(b)
Percent of class:
The information required by Item 4(b) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
(ii) Shared power to vote or to direct the vote:
The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
(iii) Sole power to dispose or to direct the disposition of:
The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
(iv) Shared power to dispose or to direct the disposition of:
The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
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.
To the knowledge of AFI, CMIA and the Fund, no other persons besides AFI, CMIA and the Fund and those persons for whose shares of common stock CMIA and AFI report beneficial ownership have the right to receive or the power to direct the receipt of dividends from or the proceeds from the sale of the securities of the issuer reported herein. As of May 31, 2026, only the Fund owned more than 5% of the class of securities reported herein.
Any remaining shares reported herein by CMIA are held by various other funds or accounts managed by CMIA which each have the right to receive any dividends paid by the issuer and could terminate their respective investment advisory relationship with CMIA and then subsequently direct the use of proceeds from the sale of the common stock owned by such fund or account. To CMIA's knowledge, none of these other funds or accounts own more than 5% of the outstanding shares of the issuer as of May 31, 2026.
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.
AFI: See Exhibit I
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.
Ameriprise Financial, Inc.
Signature:
/s/ Michael G. Clarke
Name/Title:
Michael G. Clarke / Senior Vice President, North America Head of Operations & Investor Services
Date:
06/05/2026
Columbia Management Investment Advisers, LLC
Signature:
/s/ Michael G. Clarke
Name/Title:
Michael G. Clarke / Senior Vice President, North America Head of Operations & Investor Services
Date:
06/05/2026
Columbia Seligman Technology and Information Fund
Signature:
/s/ Michael G. Clarke
Name/Title:
Michael G. Clarke / Senior Vice President & Chief Financial Officer
Date:
06/05/2026
Comments accompanying signature:
Contact Information
Charles Chiesa
VP Fund Treasurer Global Operations and Investor Services
Telephone: 617-385-9593
Exhibit Information
Exhibit Index
Exhibit I Identification and Classification of the Subsidiary which Acquired the Security Being
Reported on by the Parent Holding Company.
Exhibit II Joint Filing Agreement
