KOUPLEN ANGELA (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

KOUPLEN ANGELA

Filed: 2/19/2026ACC: 0001193125-26-059425

InsiderKOUPLEN ANGELACIK 1675087

→

IssuerONE GAS, INC.CIK 1587732

Officer· See Remarks

Since Feb 2026

+2.14K

Net shares

Net buyer

$111.9K

Total sold

Open market trades

0B · 0S

Total transactions

6.74K acquired · 4.60K disposed

Non-Derivative Transactions4

Common stock, par value $0.01

Direct

M · Option Exercise

+718.29

Price / share

$86.04

Trade value

$61.80K

% of position

49.9%

2/14/2026

1.44K→2.16K

Common stock, par value $0.01

Direct

F · Tax Withholding

−300.60

Price / share

$86.04

Trade value

$25.86K

% of position

13.9%

2/14/2026

2.16K→1.86K

Common stock, par value $0.01

Direct

M · Option Exercise

+2.18K

Price / share

$86.04

Trade value

$187.81K

% of position

851.6%

2/16/2026

256.32→2.44K

Common stock, par value $0.01

Direct

F · Tax Withholding

−1K

Price / share

$86.04

Trade value

$86.05K

% of position

41.0%

2/16/2026

2.44K→1.44K

Total

Net shares

+1.60K

Net value

$137.69K

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	+718.29	$86.04	$61.80K	49.9%	1.44K	2.16K
Common stock, par value $0.01 Direct	2/14/2026	F · Tax Withholding	−300.60	$86.04	$25.86K	13.9%	2.16K	1.86K
Common stock, par value $0.01 Direct	2/16/2026	M · Option Exercise	+2.18K	$86.04	$187.81K	851.6%	256.32	2.44K
Common stock, par value $0.01 Direct	2/16/2026	F · Tax Withholding	−1K	$86.04	$86.05K	41.0%	2.44K	1.44K
Total			+1.60K		$137.69K

Derivative Transactions4

Restricted Units 2023

Direct

M · Option Exercise

Converts to

Common stock, par value $0.01

660.00 shares

−660.00

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

2.64K shares

−2.64K

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 $0.01660.00 shares	2/14/2026	M · Option Exercise	−660.00	—	0.00
Performance Units 2023 Direct	Common stock, par value $0.012.64K shares	2/16/2026	M · Option Exercise	−2.64K	—	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