[Form 4] Tenable Holdings, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Seawell A. Brooke, a director of Tenable Holdings, Inc. (TENB), reported insider transactions on 09/09/2025. The filing discloses the sale of common stock in multiple transactions at a weighted average price of $30.80 (range $30.80–$30.82). The Form 4 indicates 15,000 shares were sold (reported with transaction code S) and additional dispositions are listed totaling 9,230 shares. The reporting person acts as trustee of two revocable trusts named in the form. The signature on the filing is by an attorney-in-fact dated 09/11/2025.

Positive

• None.

Negative

• Reported sale of 15,000 shares on 09/09/2025 at a weighted average price of $30.80 (range $30.80–$30.82).
• Additional disposition of 9,230 shares is listed in the filing, indicating further reductions in beneficial holdings.

Insights

Securities Analyst

TL;DR: Insider director sold shares on 09/09/2025 at a weighted average near $30.80; filing shows trust-based ownership and sale details.

The Form 4 documents routine director dispositions rather than option exercises or derivative transactions. The weighted average price disclosure and footnote clarifying multiple trade prices are standard for aggregated sale reporting. The filing names two revocable trusts for which the reporting person serves as trustee, indicating indirect beneficial ownership structures are in place. No derivative holdings, grants, or acquisitions are reported in this filing.

Corporate Governance Expert

TL;DR: Director sold company stock via trusts; disclosure is procedural and provides required details about trusteeship and sale pricing.

The report properly flags the reporting person as a director and discloses the trustee roles for two revocable trusts. The explanation footnotes conform to standard Form 4 practices by providing the price range and offering to provide per-trade breakdowns on request. There is no indication of coordinated group filings or 10b5-1 plan checkbox marked in the visible content.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SEAWELL A BROOKE

(Last) (First) (Middle)

C/O TENABLE HOLDINGS, INC.

6100 MERRIWEATHER DRIVE

(Street)

COLUMBIA MD 21044

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Tenable Holdings, Inc. [ TENB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/09/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/09/2025		S		15,000	D	$30.8(1)	0	I	Trust(2)
Common Stock								9,230	D
Common Stock								15,000	I	Trust(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.80 - $30.82, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4.

2. Reporting Person is the Trustee of the Rosemary and A. Brooke Seawell Revocable Trust (Administrative Trust).

3. Reporting Person is the Trustee of the Alexander Brooke Seawell Revocable Trust.

Remarks:

	/s/ David Bartholomew, Attorney-in-Fact	09/11/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did TENB director Seawell A. Brooke report on Form 4?

The Form 4 reports sales of TENB common stock on 09/09/2025, including 15,000 shares sold at a weighted average price of about $30.80 and an additional 9,230-share disposition.

When were the transactions reported for TENB insider Seawell A. Brooke?

The transactions occurred on 09/09/2025, and the Form 4 was signed by an attorney-in-fact on 09/11/2025.

Does the Form 4 show Seawell A. Brooke is a company insider for TENB?

Yes. The filing checks Director for the reporting person, indicating an insider role.

Did the filing disclose ownership through trusts?

Yes. The reporting person is identified as trustee of the Rosemary and A. Brooke Seawell Revocable Trust and the Alexander Brooke Seawell Revocable Trust.

Were any derivative securities or option transactions reported?

No derivative securities, options, or conversions are listed in Table II of this Form 4; only common stock dispositions are shown.