What did the 6,062-share transaction for Tenable (TENB) represent in Seawell’s Form 4?

The 6,062-share transaction represents the exercise of previously granted restricted stock units. Those RSUs had fully vested as of May 13, 2026, and were converted into an equal number of Tenable common shares, increasing Seawell’s direct share ownership without any reported open-market sale.

Tenable (TENB) director granted 9,718 RSUs, exercises 6,062 shares

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Tenable Holdings director Alexander Brooke Seawell reported routine equity compensation activity. On May 13, 2026, he received a grant of 9,718 restricted stock units (RSUs), each representing a right to receive one share of Tenable common stock. The filing also shows that 6,062 previously granted RSUs fully vested and were exercised into 6,062 shares of common stock on the same date. Following these transactions, Seawell holds 15,292 shares of common stock directly and 15,000 shares indirectly through the Alexander Brooke Seawell Revocable Trust. The new RSUs vest 100% on the earlier of May 13, 2027 or Tenable’s next annual shareholder meeting, subject to his continued service and certain acceleration conditions.

Insider Trade Summary

6,062 shares exercised/converted

Mixed 4 txns

Insider SEAWELL A BROOKE

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	6,062	$0.00	--
Grant/Award	Restricted Stock Units	9,718	$0.00	--
Exercise	Common Stock	6,062	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 15,292 shares (Direct, null); Common Stock — 15,000 shares (Indirect, Trust)

Footnotes (1)

Reporting Person is Trustee of the Alexander Brooke Seawell Revocable Trust. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Issuer common stock. 100% of the shares underlying the RSUs vested as of May 13, 2026. 100% of the shares underlying the RSUs vest on the earlier of May 13, 2027 or the Issuer's next annual shareholder meeting, subject to the Reporting Person's continuous service with the Issuer as of the applicable vesting date, and subject to accelerated vesting in specified circumstances.

Key Figures

RSUs exercised: 6,062 shares New RSU grant: 9,718 RSUs Direct common shares after: 15,292 shares +4 more

7 metrics

RSUs exercised 6,062 shares Previously granted RSUs converted to common stock on May 13, 2026

New RSU grant 9,718 RSUs RSUs granted on May 13, 2026, each for one common share

Direct common shares after 15,292 shares Direct Tenable common stock holdings following transactions

Indirect trust shares 15,000 shares Held via Alexander Brooke Seawell Revocable Trust

Outstanding RSUs after 9,718 RSUs Restricted stock units remaining after the exercise of 6,062 RSUs

RSU vesting complete 100% Shares underlying certain RSUs vested as of May 13, 2026

Future vesting date May 13, 2027 Latest possible vesting date for new 9,718 RSUs, or earlier at next shareholder meeting

Key Terms

Restricted Stock Units, Revocable Trust, vesting, grant, award, or other acquisition

4 terms

Restricted Stock Units financial

"The filing reports transactions in "Restricted Stock Units" that convert into common stock."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Revocable Trust financial

"Shares are held through the Alexander Brooke Seawell Revocable Trust, where he is trustee."

A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.

vesting financial

"100% of the shares underlying the RSUs vested as of May 13, 2026."

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

grant, award, or other acquisition regulatory

"One RSU transaction is described as a "Grant, award, or other acquisition"."

Form 4 Insider Transactions: What Each Field Means →

05/15/2026 - 05:12 PM

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
Estimated average burden
hours per response:			0.5

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

MARYLAND

21044

(City)

(State)

(Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/13/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/13/2026		M		6,062	A	$0	15,292	D
Common Stock								15,000	I	Trust⁽¹⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽²⁾	05/13/2026		M			6,062	⁽³⁾	⁽³⁾	Common Stock	6,062	$0	0	D
Restricted Stock Units	⁽²⁾	05/13/2026		A		9,718		⁽⁴⁾	⁽⁴⁾	Common Stock	9,718	$0	9,718	D

Explanation of Responses:

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

2. Each restricted stock unit ("RSU") represents a contingent right to receive one share of Issuer common stock.

3. 100% of the shares underlying the RSUs vested as of May 13, 2026.

4. 100% of the shares underlying the RSUs vest on the earlier of May 13, 2027 or the Issuer's next annual shareholder meeting, subject to the Reporting Person's continuous service with the Issuer as of the applicable vesting date, and subject to accelerated vesting in specified circumstances.

Remarks:

	/s/ David Bartholomew, Attorney-in-Fact	05/15/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Tenable (TENB) director Alexander Brooke Seawell report?

Alexander Brooke Seawell reported routine equity compensation activity. He exercised 6,062 previously vested restricted stock units into common shares and received a new grant of 9,718 restricted stock units, all dated May 13, 2026, with no open-market buying or selling disclosed.

How many Tenable (TENB) shares does Alexander Brooke Seawell hold after these Form 4 transactions?

After these transactions, Seawell holds 15,292 Tenable common shares directly and 15,000 shares indirectly through the Alexander Brooke Seawell Revocable Trust. The Form 4 also shows 9,718 restricted stock units outstanding, each convertible into one share upon future vesting.

What are the terms of Alexander Brooke Seawell’s new 9,718 RSU grant at Tenable (TENB)?

The new grant consists of 9,718 restricted stock units, each equal to one Tenable common share. All underlying shares vest on the earlier of May 13, 2027 or Tenable’s next annual shareholder meeting, contingent on Seawell’s continued service and subject to specified accelerated vesting conditions.

How are Alexander Brooke Seawell’s indirect Tenable (TENB) holdings structured?

Seawell’s indirect holdings are 15,000 Tenable common shares held in the Alexander Brooke Seawell Revocable Trust. The filing notes he is the trustee of this trust, and these shares are reported as indirectly owned, separate from his 15,292 directly held shares.