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: 5/26/2026ACC: 0001651579-26-000006

InsiderTHURMOND MARK C.CIK 1651579

→

IssuerTENABLE HOLDINGS, INC.CIK 1660280

DirectorOfficer· Co-Chief Executive Officer

Since Feb 2026

-12.27K

Net shares

Net seller

$312.2K

Total sold

Open market trades

0B · 0S

Total transactions

25.37K acquired · 37.64K disposed

Non-Derivative Transactions12

Common Stock

Direct

M · Option Exercise

+1.16K

Price / share

—

Trade value

—

% of position

0.7%

5/22/2026

169.09K→170.25K

Common Stock

Direct

F · Tax Withholding

−562.00

Price / share

$25.45

Trade value

$14.30K

% of position

0.3%

5/22/2026

170.25K→169.69K

Common Stock

Direct

M · Option Exercise

+2.27K

Price / share

—

Trade value

—

% of position

1.3%

5/22/2026

169.69K→171.95K

Common Stock

Direct

F · Tax Withholding

−1.10K

Price / share

$25.45

Trade value

$27.92K

% of position

0.6%

5/22/2026

171.95K→170.86K

Common Stock

Direct

M · Option Exercise

+6.09K

Price / share

—

Trade value

—

% of position

3.6%

5/22/2026

170.86K→176.95K

Common Stock

Direct

F · Tax Withholding

−2.95K

Price / share

$25.45

Trade value

$75K

% of position

1.7%

5/22/2026

176.95K→174K

Common Stock

Direct

M · Option Exercise

+3.71K

Price / share

—

Trade value

—

% of position

2.1%

5/22/2026

174K→177.72K

Common Stock

Direct

F · Tax Withholding

−1.80K

Price / share

$25.45

Trade value

$45.71K

% of position

1.0%

5/22/2026

177.72K→175.92K

Common Stock

Direct

M · Option Exercise

+7.76K

Price / share

—

Trade value

—

% of position

4.4%

5/22/2026

175.92K→183.69K

Common Stock

Direct

F · Tax Withholding

−3.75K

Price / share

$25.45

Trade value

$95.54K

% of position

2.0%

5/22/2026

183.69K→179.93K

Common Stock

Direct

M · Option Exercise

+4.37K

Price / share

—

Trade value

—

% of position

2.4%

5/22/2026

179.93K→184.30K

Common Stock

Direct

F · Tax Withholding

−2.11K

Price / share

$25.45

Trade value

$53.75K

% of position

1.1%

5/22/2026

184.30K→182.19K

Total

Net shares

+13.10K

Net value

-$312.22K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	5/22/2026	M · Option Exercise	+1.16K	—	—	0.7%	169.09K	170.25K
Common Stock Direct	5/22/2026	F · Tax Withholding	−562.00	$25.45	$14.30K	0.3%	170.25K	169.69K
Common Stock Direct	5/22/2026	M · Option Exercise	+2.27K	—	—	1.3%	169.69K	171.95K
Common Stock Direct	5/22/2026	F · Tax Withholding	−1.10K	$25.45	$27.92K	0.6%	171.95K	170.86K
Common Stock Direct	5/22/2026	M · Option Exercise	+6.09K	—	—	3.6%	170.86K	176.95K
Common Stock Direct	5/22/2026	F · Tax Withholding	−2.95K	$25.45	$75K	1.7%	176.95K	174K
Common Stock Direct	5/22/2026	M · Option Exercise	+3.71K	—	—	2.1%	174K	177.72K
Common Stock Direct	5/22/2026	F · Tax Withholding	−1.80K	$25.45	$45.71K	1.0%	177.72K	175.92K
Common Stock Direct	5/22/2026	M · Option Exercise	+7.76K	—	—	4.4%	175.92K	183.69K
Common Stock Direct	5/22/2026	F · Tax Withholding	−3.75K	$25.45	$95.54K	2.0%	183.69K	179.93K
Common Stock Direct	5/22/2026	M · Option Exercise	+4.37K	—	—	2.4%	179.93K	184.30K
Common Stock Direct	5/22/2026	F · Tax Withholding	−2.11K	$25.45	$53.75K	1.1%	184.30K	182.19K
Total			+13.10K		-$312.22K

Derivative Transactions6

Performance Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

1.16K shares

−1.16K

Strike price

Held after

3.49K

Exercisable

—

5/22/2026

Performance Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

2.27K shares

−2.27K

Strike price

Held after

15.87K

Exercisable

—

5/22/2026

Performance Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

6.09K shares

−6.09K

Strike price

Held after

67.05K

Exercisable

—

5/22/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

3.71K shares

−3.71K

Strike price

Held after

11.14K

Exercisable

—

5/22/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

7.76K shares

−7.76K

Strike price

Held after

85.41K

Exercisable

—

5/22/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

4.37K shares

−4.37K

Strike price

Held after

30.58K

Exercisable

—

5/22/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Performance Restricted Stock Units Direct	Common Stock1.16K shares	5/22/2026	M · Option Exercise	−1.16K	—	3.49K
Performance Restricted Stock Units Direct	Common Stock2.27K shares	5/22/2026	M · Option Exercise	−2.27K	—	15.87K
Performance Restricted Stock Units Direct	Common Stock6.09K shares	5/22/2026	M · Option Exercise	−6.09K	—	67.05K
Restricted Stock Units Direct	Common Stock3.71K shares	5/22/2026	M · Option Exercise	−3.71K	—	11.14K
Restricted Stock Units Direct	Common Stock7.76K shares	5/22/2026	M · Option Exercise	−7.76K	—	85.41K
Restricted Stock Units Direct	Common Stock4.37K shares	5/22/2026	M · Option Exercise	−4.37K	—	30.58K