Mark C. Thurmond - 24 Aug 2026 Form 4 Insider Report for Tenable Holdings, Inc. (TENB)

Reporting relationship: Co-Chief Executive Officer, Director
Issuer ticker: TENB
Reported as of: 24 Aug 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 25 Aug 2026, 16:03:13 UTC
Prior SEC filing: 26 May 2026
Source filing: View source filing
Reporting owner signature: /s/ David Bartholomew, Attorney-in-Fact

Key filing fact

Mark C. Thurmond filed Form 4 for Tenable Holdings, Inc. (TENB) on 25 Aug 2026.

Key facts

This page summarizes Mark C. Thurmond's Form 4 filing for Tenable Holdings, Inc. (TENB).
18 reported transactions and 6 derivative rows are listed below.
Accepted by SEC: 25 Aug 2026, 16:03.

Change

Previous filing in this sequence was filed on 26 May 2026.
Current net transaction value: $0.

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 0001651579 Primary reporting owner

Thurmond Mark C.

Relationship: Co-Chief Executive Officer, Director
Address: C/O TENABLE HOLDINGS, INC., 6100 MERRIWEATHER DRIVE, COLUMBIA
Signature: /s/ David Bartholomew, Attorney-in-Fact
Signature date: 25 Aug 2026

Reported non-derivative transactions

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

TENB transaction

Common Stock

Options Exercise

Transaction value
Shares: +1,162
Change %: +0.64%
Price: $0.000000^*
Shares after: 183,350
Date: 24 Aug 2026
Ownership: Direct

TENB transaction

Common Stock

Tax liability

Transaction value
Shares: -562
Change %: -0.31%
Price: $33.94^*
Shares after: 182,788
Date: 24 Aug 2026
Ownership: Direct
Footnotes: F1

TENB transaction

Common Stock

Options Exercise

Transaction value
Shares: +2,267
Change %: +1.2%
Price: $0.000000^*
Shares after: 185,055
Date: 24 Aug 2026
Ownership: Direct

TENB transaction

Common Stock

Tax liability

Transaction value
Shares: -1,097
Change %: -0.59%
Price: $33.94^*
Shares after: 183,958
Date: 24 Aug 2026
Ownership: Direct
Footnotes: F1

TENB transaction

Common Stock

Options Exercise

Transaction value
Shares: +6,095
Change %: +3.3%
Price: $0.000000^*
Shares after: 190,053
Date: 24 Aug 2026
Ownership: Direct

TENB transaction

Common Stock

Tax liability

Transaction value
Shares: -2,947
Change %: -1.6%
Price: $33.94^*
Shares after: 187,106
Date: 24 Aug 2026
Ownership: Direct
Footnotes: F1

TENB transaction

Common Stock

Options Exercise

Transaction value
Shares: +3,713
Change %: +2%
Price: $0.000000^*
Shares after: 190,819
Date: 24 Aug 2026
Ownership: Direct

TENB transaction

Common Stock

Tax liability

Transaction value
Shares: -1,796
Change %: -0.94%
Price: $33.94^*
Shares after: 189,023
Date: 24 Aug 2026
Ownership: Direct
Footnotes: F1

TENB transaction

Common Stock

Options Exercise

Transaction value
Shares: +7,764
Change %: +4.1%
Price: $0.000000^*
Shares after: 196,787
Date: 24 Aug 2026
Ownership: Direct

TENB transaction

Common Stock

Tax liability

Transaction value
Shares: -3,754
Change %: -1.9%
Price: $33.94^*
Shares after: 193,033
Date: 24 Aug 2026
Ownership: Direct
Footnotes: F1

TENB transaction

Common Stock

Options Exercise

Transaction value
Shares: +4,368
Change %: +2.3%
Price: $0.000000^*
Shares after: 197,401
Date: 24 Aug 2026
Ownership: Direct

TENB transaction

Common Stock

Tax liability

Transaction value
Shares: -2,112
Change %: -1.1%
Price: $33.94^*
Shares after: 195,289
Date: 24 Aug 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

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

TENB transaction Derivative

Performance Restricted Stock Units

Options Exercise

Transaction value
Shares: -1,162
Change %: -33%
Price: $0.000000^*
Shares after: 2,330
Date: 24 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,162
Exercise price
Footnotes: F2, F3

TENB transaction Derivative

Performance Restricted Stock Units

Options Exercise

Transaction value
Shares: -2,267
Change %: -14%
Price: $0.000000^*
Shares after: 13,606
Date: 24 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,267
Exercise price
Footnotes: F2, F4

TENB transaction Derivative

Performance Restricted Stock Units

Options Exercise

Transaction value
Shares: -6,095
Change %: -9.1%
Price: $0.000000^*
Shares after: 60,957
Date: 24 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,095
Exercise price
Footnotes: F2, F5

TENB transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -3,713
Change %: -33%
Price: $0.000000^*
Shares after: 7,426
Date: 24 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,713
Exercise price
Footnotes: F2, F6

TENB transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -7,764
Change %: -9.1%
Price: $0.000000^*
Shares after: 77,644
Date: 24 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,764
Exercise price
Footnotes: F2, F7

TENB transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -4,368
Change %: -14%
Price: $0.000000^*
Shares after: 26,208
Date: 24 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 4,368
Exercise price
Footnotes: F2, F8

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 8 footnotes

Footnote F1

Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of the Restricted Stock Units ("RSUs") and does not represent a sale.

Footnote F2

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

Footnote F3

On February 21, 2024, the Compensation Committee of the Issuer's Board of Directors certified the achievement of the Performance Restricted Stock Units (PRSUs) granted on February 22, 2023 and determined a 93.9% payout for the measurement period based on the Issuer's fiscal year 2023 criteria. 25% of the shares underlying the PRSUs vested on February 22, 2024, with the remainder vesting in equal quarterly installments over 3 years, 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.

Footnote F4

On February 13, 2025, the Compensation Committee of the Issuer's Board of Directors certified the achievement of the Performance Restricted Stock Units (PRSUs) granted on February 22, 2024 and determined a 96.4% payout for the measurement period based on the Issuer's fiscal year 2024 criteria. 25% of the shares underlying the PRSUs vested on February 22, 2025, with the remainder vesting in equal quarterly installments over 3 years, 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.

Footnote F5

On February 25, 2026, the Compensation Committee of the Issuer's Board of Directors certified the achievement of the Performance Restricted Stock Units (PRSUs) granted on February 21, 2025 and determined a 97.2% payout for the measurement period based on the Issuer's fiscal year 2025 criteria. 25% of the shares underlying the PRSUs vested on February 25, 2026, with the remainder vesting in equal quarterly installments over 3 years, 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.

Footnote F6

25% of the shares underlying the RSUs vested on February 22, 2024, with the remainder vesting in equal quarterly installments over 3 years, 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.

Footnote F7

25% of the shares underlying the RSUs vested on August 22, 2025, 25% on February 22, 2026, with the remainder vesting in equal quarterly installments over 3 years, 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.

Footnote F8

25% of the shares underlying the RSUs vested on February 22, 2025, with the remainder vesting in equal quarterly installments over 3 years, 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.