A. Brooke Seawell - 15 Dec 2025 Form 4 Insider Report for Tenable Holdings, Inc. (TENB)

Reporting relationship: Director
Issuer ticker: TENB
Reported as of: 15 Dec 2025
Net transaction value: -$1,743,400
SEC form: 4
Accepted by SEC: 17 Dec 2025, 19:51:08 UTC
Prior SEC filing: 04 Dec 2025
Next SEC filing: 19 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ David Bartholomew, Attorney-in-Fact

Key filing fact

A. Brooke Seawell filed Form 4 for Tenable Holdings, Inc. (TENB) on 17 Dec 2025.

Key facts

This page summarizes A. Brooke Seawell's Form 4 filing for Tenable Holdings, Inc. (TENB).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 17 Dec 2025, 19:51.

Change

Previous filing in this sequence was filed on 04 Dec 2025.
Current net transaction value: -$1,743,400.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001197652 Primary reporting owner

SEAWELL A BROOKE

Relationship: Director
Address: C/O TENABLE HOLDINGS, INC., 6100 MERRIWEATHER DRIVE, COLUMBIA
Signature: /s/ David Bartholomew, Attorney-in-Fact
Signature date: 17 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

TENB transaction

Common Stock

Options Exercise

Transaction value: $1,110,900
Shares: +115,000
Change %
Price: $9.66
Shares after: 115,000
Date: 15 Dec 2025
Ownership: Trust
Footnotes: F1

TENB transaction

Common Stock

Sale

Transaction value: $2,854,300
Shares: -115,000
Change %: -100%
Price: $24.82
Shares after: 0
Date: 15 Dec 2025
Ownership: Trust
Footnotes: F1, F2, F3

TENB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 9,230
Date: 15 Dec 2025
Ownership: Direct

TENB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 15,000
Date: 15 Dec 2025
Ownership: Trust
Footnotes: F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

TENB transaction Derivative

Employee Stock Option (right to buy)

Options Exercise

Transaction value: $0
Shares: -115,000
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 15 Dec 2025
Ownership: Trust
Underlying class: Common Stock
Underlying amount: 115,000
Exercise price: $9.66
Footnotes: F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

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

Footnote F2

The reported transaction was effected as part of estate administration of the Trust.

Footnote F3

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.67 - $25.01, 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 (3) to this Form 4.

Footnote F4

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

Footnote F5

100% of the shares underlying the option vested on October 26, 2021.