SIGHINOLFI CHRISTOPHER P. (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

SIGHINOLFI CHRISTOPHER P.

Filed: 2/20/2025ACC: 0000950170-25-024170

InsiderSIGHINOLFI CHRISTOPHER P.CIK 2003976

→

IssuerONE GAS, INC.CIK 1587732

Officer· See Remarks

Since Feb 2026

+8.65K

Net shares

Net buyer

$16.7K

Total sold

Open market trades

0B · 0S

Total transactions

10.70K acquired · 2.05K disposed

Non-Derivative Transactions4

Common stock, par value $0.01

Direct

M · Option Exercise

+758.35

Price / share

—

Trade value

—

% of position

53.0%

2/18/2025

1.43K→2.19K

Common stock, par value $0.01

Direct

F · Tax Withholding

−59.15

Price / share

$71.53

Trade value

$4.23K

% of position

2.7%

2/18/2025

2.19K→2.13K

Common stock, par value $0.01

Direct

M · Option Exercise

+505.94

Price / share

$71.53

Trade value

$36.19K

% of position

23.8%

2/18/2025

2.13K→2.64K

Common stock, par value $0.01

Direct

F · Tax Withholding

−174.04

Price / share

$71.53

Trade value

$12.45K

% of position

6.6%

2/18/2025

2.64K→2.46K

Total

Net shares

+1.03K

Net value

$19.51K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock, par value $0.01 Direct	2/18/2025	M · Option Exercise	+758.35	—	—	53.0%	1.43K	2.19K
Common stock, par value $0.01 Direct	2/18/2025	F · Tax Withholding	−59.15	$71.53	$4.23K	2.7%	2.19K	2.13K
Common stock, par value $0.01 Direct	2/18/2025	M · Option Exercise	+505.94	$71.53	$36.19K	23.8%	2.13K	2.64K
Common stock, par value $0.01 Direct	2/18/2025	F · Tax Withholding	−174.04	$71.53	$12.45K	6.6%	2.64K	2.46K
Total			+1.03K		$19.51K

Derivative Transactions4

Performance Units 2022

Direct

M · Option Exercise

Converts to

Common stock, par value $0.01

1.36K shares

−1.36K

Strike price

Held after

0.00

Exercisable

—

2/18/2025

Restricted Units 2022

Direct

M · Option Exercise

Converts to

Common stock, par value $0.01

455.00 shares

−455.00

Strike price

Held after

0.00

Exercisable

—

2/18/2025

Performance Units 2025

Direct

A · Award

Converts to

Common stock, par value $0.01

5.66K shares

+5.66K

Strike price

Held after

5.66K

Exercisable

—

2/18/2025

Restricted Units 2025

Direct

A · Award

Converts to

Common stock, par value $0.01

3.77K shares

+3.77K

Strike price

Held after

3.77K

Exercisable

—

2/18/2025

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Performance Units 2022 Direct	Common stock, par value $0.011.36K shares	2/18/2025	M · Option Exercise	−1.36K	—	0.00
Restricted Units 2022 Direct	Common stock, par value $0.01455.00 shares	2/18/2025	M · Option Exercise	−455.00	—	0.00
Performance Units 2025 Direct	Common stock, par value $0.015.66K shares	2/18/2025	A · Award	+5.66K	—	5.66K
Restricted Units 2025 Direct	Common stock, par value $0.013.77K shares	2/18/2025	A · Award	+3.77K	—	3.77K