THURMOND MARK C. (Co-Chief Executive Officer) exercised options at TENABLE HOLDINGS, INC.

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 6 exercises

THURMOND MARK C.

Filed: 11/25/2025ACC: 0001651579-25-000004

InsiderTHURMOND MARK C.CIK 1651579

→

IssuerTENABLE HOLDINGS, INC.CIK 1660280

DirectorOfficer· Co-Chief Executive Officer

Since Feb 2026

-8.09K

Net shares

Net seller

$207.8K

Total sold

Open market trades

0B · 0S

Total transactions

16.73K acquired · 24.82K disposed

Non-Derivative Transactions12

Common Stock

Direct

M · Option Exercise

+1.36K

Price / share

—

Trade value

—

% of position

1.3%

11/24/2025

105K→106.36K

Common Stock

Direct

F · Tax Withholding

−660.00

Price / share

$25.68

Trade value

$16.95K

% of position

0.6%

11/24/2025

106.36K→105.70K

Common Stock

Direct

M · Option Exercise

+1.16K

Price / share

—

Trade value

—

% of position

1.1%

11/24/2025

105.70K→106.87K

Common Stock

Direct

F · Tax Withholding

−562.00

Price / share

$25.68

Trade value

$14.43K

% of position

0.5%

11/24/2025

106.87K→106.30K

Common Stock

Direct

M · Option Exercise

+2.27K

Price / share

—

Trade value

—

% of position

2.1%

11/24/2025

106.30K→108.57K

Common Stock

Direct

F · Tax Withholding

−1.10K

Price / share

$25.68

Trade value

$28.17K

% of position

1.0%

11/24/2025

108.57K→107.47K

Common Stock

Direct

M · Option Exercise

+3.86K

Price / share

—

Trade value

—

% of position

3.6%

11/24/2025

107.47K→111.33K

Common Stock

Direct

F · Tax Withholding

−1.86K

Price / share

$25.68

Trade value

$47.89K

% of position

1.7%

11/24/2025

111.33K→109.47K

Common Stock

Direct

M · Option Exercise

+3.71K

Price / share

—

Trade value

—

% of position

3.4%

11/24/2025

109.47K→113.18K

Common Stock

Direct

F · Tax Withholding

−1.80K

Price / share

$25.68

Trade value

$46.12K

% of position

1.6%

11/24/2025

113.18K→111.38K

Common Stock

Direct

M · Option Exercise

+4.37K

Price / share

—

Trade value

—

% of position

3.9%

11/24/2025

111.38K→115.75K

Common Stock

Direct

F · Tax Withholding

−2.11K

Price / share

$25.68

Trade value

$54.24K

% of position

1.8%

11/24/2025

115.75K→113.64K

Total

Net shares

+8.64K

Net value

-$207.80K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	11/24/2025	M · Option Exercise	+1.36K	—	—	1.3%	105K	106.36K
Common Stock Direct	11/24/2025	F · Tax Withholding	−660.00	$25.68	$16.95K	0.6%	106.36K	105.70K
Common Stock Direct	11/24/2025	M · Option Exercise	+1.16K	—	—	1.1%	105.70K	106.87K
Common Stock Direct	11/24/2025	F · Tax Withholding	−562.00	$25.68	$14.43K	0.5%	106.87K	106.30K
Common Stock Direct	11/24/2025	M · Option Exercise	+2.27K	—	—	2.1%	106.30K	108.57K
Common Stock Direct	11/24/2025	F · Tax Withholding	−1.10K	$25.68	$28.17K	1.0%	108.57K	107.47K
Common Stock Direct	11/24/2025	M · Option Exercise	+3.86K	—	—	3.6%	107.47K	111.33K
Common Stock Direct	11/24/2025	F · Tax Withholding	−1.86K	$25.68	$47.89K	1.7%	111.33K	109.47K
Common Stock Direct	11/24/2025	M · Option Exercise	+3.71K	—	—	3.4%	109.47K	113.18K
Common Stock Direct	11/24/2025	F · Tax Withholding	−1.80K	$25.68	$46.12K	1.6%	113.18K	111.38K
Common Stock Direct	11/24/2025	M · Option Exercise	+4.37K	—	—	3.9%	111.38K	115.75K
Common Stock Direct	11/24/2025	F · Tax Withholding	−2.11K	$25.68	$54.24K	1.8%	115.75K	113.64K
Total			+8.64K		-$207.80K

Derivative Transactions6

Performance Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

1.36K shares

−1.36K

Strike price

Held after

1.36K

Exercisable

—

11/24/2025

Performance Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

1.16K shares

−1.16K

Strike price

Held after

5.82K

Exercisable

—

11/24/2025

Performance Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

2.27K shares

−2.27K

Strike price

Held after

20.41K

Exercisable

—

11/24/2025

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

3.86K shares

−3.86K

Strike price

Held after

3.86K

Exercisable

—

11/24/2025

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

3.71K shares

−3.71K

Strike price

Held after

18.57K

Exercisable

—

11/24/2025

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

4.37K shares

−4.37K

Strike price

Held after

39.31K

Exercisable

—

11/24/2025

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Performance Restricted Stock Units Direct	Common Stock1.36K shares	11/24/2025	M · Option Exercise	−1.36K	—	1.36K
Performance Restricted Stock Units Direct	Common Stock1.16K shares	11/24/2025	M · Option Exercise	−1.16K	—	5.82K
Performance Restricted Stock Units Direct	Common Stock2.27K shares	11/24/2025	M · Option Exercise	−2.27K	—	20.41K
Restricted Stock Units Direct	Common Stock3.86K shares	11/24/2025	M · Option Exercise	−3.86K	—	3.86K
Restricted Stock Units Direct	Common Stock3.71K shares	11/24/2025	M · Option Exercise	−3.71K	—	18.57K
Restricted Stock Units Direct	Common Stock4.37K shares	11/24/2025	M · Option Exercise	−4.37K	—	39.31K