BENDER MARK A. (See Remarks) exercised options at ONE GAS, INC.

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

M · 2 exercises

BENDER MARK A.

Filed: 2/19/2026ACC: 0001193125-26-059424

InsiderBENDER MARK A.CIK 1657393

→

IssuerONE GAS, INC.CIK 1587732

Officer· See Remarks

Since Feb 2026

+1.79K

Net shares

Net buyer

$142.6K

Total sold

Open market trades

0B · 0S

Total transactions

7.42K acquired · 5.63K disposed

Non-Derivative Transactions4

Common stock, par value $0.01

Direct

M · Option Exercise

+887.56

Price / share

$86.04

Trade value

$76.37K

% of position

3.1%

2/14/2026

28.58K→29.47K

Common stock, par value $0.01

Direct

F · Tax Withholding

−389.19

Price / share

$86.04

Trade value

$33.49K

% of position

1.3%

2/14/2026

29.47K→29.08K

Common stock, par value $0.01

Direct

M · Option Exercise

+2.70K

Price / share

$86.04

Trade value

$232.08K

% of position

9.9%

2/16/2026

27.15K→29.85K

Common stock, par value $0.01

Direct

F · Tax Withholding

−1.27K

Price / share

$86.04

Trade value

$109.11K

% of position

4.2%

2/16/2026

29.85K→28.58K

Total

Net shares

+1.93K

Net value

$165.85K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock, par value $0.01 Direct	2/14/2026	M · Option Exercise	+887.56	$86.04	$76.37K	3.1%	28.58K	29.47K
Common stock, par value $0.01 Direct	2/14/2026	F · Tax Withholding	−389.19	$86.04	$33.49K	1.3%	29.47K	29.08K
Common stock, par value $0.01 Direct	2/16/2026	M · Option Exercise	+2.70K	$86.04	$232.08K	9.9%	27.15K	29.85K
Common stock, par value $0.01 Direct	2/16/2026	F · Tax Withholding	−1.27K	$86.04	$109.11K	4.2%	29.85K	28.58K
Total			+1.93K		$165.85K

Derivative Transactions4

Restricted Units 2023

Direct

M · Option Exercise

Converts to

Common stock, par value $0.01

795.00 shares

−795.00

Strike price

Held after

0.00

Exercisable

—

2/14/2026

Performance Units 2023

Direct

M · Option Exercise

Converts to

Common stock, par value $0.01

3.18K shares

−3.18K

Strike price

Held after

0.00

Exercisable

—

2/16/2026

Performance Units 2026

Direct

A · Award

Converts to

Common stock, par value $0.01

2.30K shares

+2.30K

Strike price

Held after

2.30K

Exercisable

—

2/16/2026

Restricted Units 2026

Direct

A · Award

Converts to

Common stock, par value $0.01

1.53K shares

+1.53K

Strike price

Held after

1.53K

Exercisable

—

2/16/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Units 2023 Direct	Common stock, par value $0.01795.00 shares	2/14/2026	M · Option Exercise	−795.00	—	0.00
Performance Units 2023 Direct	Common stock, par value $0.013.18K shares	2/16/2026	M · Option Exercise	−3.18K	—	0.00
Performance Units 2026 Direct	Common stock, par value $0.012.30K shares	2/16/2026	A · Award	+2.30K	—	2.30K
Restricted Units 2026 Direct	Common stock, par value $0.011.53K shares	2/16/2026	A · Award	+1.53K	—	1.53K