MCCORMICK JOSEPH L (See Remarks) exercised options at ONE GAS, INC.

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

M · 3 exercises

MCCORMICK JOSEPH L

Filed: 6/10/2026ACC: 0001193125-26-265855

InsiderMCCORMICK JOSEPH LCIK 1595607

→

IssuerONE GAS, INC.CIK 1587732

Officer· See Remarks

Since Feb 2026

-4.41K

Net shares

Net seller

$110.9K

Total sold

Open market trades

0B · 0S

Total transactions

3.33K acquired · 7.74K disposed

Non-Derivative Transactions6

Common stock, par value $0.01

Direct

M · Option Exercise

+1.27K

Price / share

$76.00

Trade value

$96.74K

% of position

1.7%

6/9/2026

74.91K→76.18K

Common stock, par value $0.01

Direct

F · Tax Withholding

−558.14

Price / share

$76.00

Trade value

$42.42K

% of position

0.7%

6/9/2026

76.18K→75.62K

Common stock, par value $0.01

Direct

M · Option Exercise

+1.23K

Price / share

$76.00

Trade value

$93.49K

% of position

1.6%

6/9/2026

75.62K→76.85K

Common stock, par value $0.01

Direct

F · Tax Withholding

−539.42

Price / share

$76.00

Trade value

$41K

% of position

0.7%

6/9/2026

76.85K→76.31K

Common stock, par value $0.01

Direct

M · Option Exercise

+824.51

Price / share

$76.00

Trade value

$62.66K

% of position

1.1%

6/9/2026

76.31K→77.14K

Common stock, par value $0.01

Direct

F · Tax Withholding

−361.55

Price / share

$76.00

Trade value

$27.48K

% of position

0.5%

6/9/2026

77.14K→76.78K

Total

Net shares

+1.87K

Net value

$142K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock, par value $0.01 Direct	6/9/2026	M · Option Exercise	+1.27K	$76.00	$96.74K	1.7%	74.91K	76.18K
Common stock, par value $0.01 Direct	6/9/2026	F · Tax Withholding	−558.14	$76.00	$42.42K	0.7%	76.18K	75.62K
Common stock, par value $0.01 Direct	6/9/2026	M · Option Exercise	+1.23K	$76.00	$93.49K	1.6%	75.62K	76.85K
Common stock, par value $0.01 Direct	6/9/2026	F · Tax Withholding	−539.42	$76.00	$41K	0.7%	76.85K	76.31K
Common stock, par value $0.01 Direct	6/9/2026	M · Option Exercise	+824.51	$76.00	$62.66K	1.1%	76.31K	77.14K
Common stock, par value $0.01 Direct	6/9/2026	F · Tax Withholding	−361.55	$76.00	$27.48K	0.5%	77.14K	76.78K
Total			+1.87K		$142K

Derivative Transactions3

Restricted Units 2023

Direct

M · Option Exercise

Converts to

Common stock, par value $0.01

1.22K shares

−1.22K

Strike price

Held after

0.00

Exercisable

—

6/9/2026

Restricted Units 2024

Direct

M · Option Exercise

Converts to

Common stock, par value $0.01

1.93K shares

−1.93K

Strike price

Held after

0.00

Exercisable

—

6/9/2026

Restricted Units 2025

Direct

M · Option Exercise

Converts to

Common stock, par value $0.01

3.13K shares

−3.13K

Strike price

Held after

0.00

Exercisable

—

6/9/2026

Security	Converts To	Date	Type	Shares	Exercisable
Restricted Units 2023 Direct	Common stock, par value $0.011.22K shares	6/9/2026	M · Option Exercise	−1.22K	—
Restricted Units 2024 Direct	Common stock, par value $0.011.93K shares	6/9/2026	M · Option Exercise	−1.93K	—
Restricted Units 2025 Direct	Common stock, par value $0.013.13K shares	6/9/2026	M · Option Exercise	−3.13K	—