HARRIS TIMOTHY J (Senior VP and CDIO) received a stock award from ATI INC

Compensation award — not an open‑market transaction. Less informative as a directional signal.

A · 2 awards

HARRIS TIMOTHY J

Filed: 1/7/2026ACC: 0001193125-26-006554

InsiderHARRIS TIMOTHY JCIK 1776844

→

IssuerATI INCCIK 1018963

Officer· Senior VP and CDIO

Since May 2019

+39.24K

Net shares

Net buyer

$6.61M

Total sold

Open market trades

0B · 0S

Total transactions

119.44K acquired · 80.20K disposed

Non-Derivative Transactions6

Common Stock, par value $0.10 per share

Direct

A · Award

+2.68K

Price / share

—

Trade value

—

% of position

2.7%

1/5/2026

98.31K→100.99K

Common Stock, par value $0.10 per share

Direct

M · Option Exercise

+70.44K

Price / share

—

Trade value

—

% of position

69.8%

1/5/2026

100.99K→171.43K

Common Stock, par value $0.10 per share

Direct

F · Tax Withholding

−30.92K

Price / share

$121.08

Trade value

$3.74M

% of position

18.0%

1/5/2026

171.43K→140.51K

Common Stock, par value $0.10 per share

Direct

A · Award

+46.32K

Price / share

—

Trade value

—

% of position

33.0%

1/5/2026

140.51K→186.83K

Common Stock, par value $0.10 per share

Direct

F · Tax Withholding

−20.28K

Price / share

$121.08

Trade value

$2.46M

% of position

10.9%

1/5/2026

186.83K→166.55K

Common Stock, par value $0.10 per share

Direct

F · Tax Withholding

−3.36K

Price / share

$121.08

Trade value

$406.71K

% of position

2.0%

1/5/2026

166.55K→163.19K

Total

Net shares

+64.88K

Net value

-$6.61M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock, par value $0.10 per share Direct	1/5/2026	A · Award	+2.68K	—	—	2.7%	98.31K	100.99K
Common Stock, par value $0.10 per share Direct	1/5/2026	M · Option Exercise	+70.44K	—	—	69.8%	100.99K	171.43K
Common Stock, par value $0.10 per share Direct	1/5/2026	F · Tax Withholding	−30.92K	$121.08	$3.74M	18.0%	171.43K	140.51K
Common Stock, par value $0.10 per share Direct	1/5/2026	A · Award	+46.32K	—	—	33.0%	140.51K	186.83K
Common Stock, par value $0.10 per share Direct	1/5/2026	F · Tax Withholding	−20.28K	$121.08	$2.46M	10.9%	186.83K	166.55K
Common Stock, par value $0.10 per share Direct	1/5/2026	F · Tax Withholding	−3.36K	$121.08	$406.71K	2.0%	166.55K	163.19K
Total			+64.88K		-$6.61M

Derivative Transactions1

Performance Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock, par value $0.10 per share

70.44K shares

−25.64K

Strike price

0.00

Held after

25.64K

Exercisable

—

1/5/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Performance Stock Unit Direct	Common Stock, par value $0.10 per share70.44K shares	1/5/2026	M · Option Exercise	−25.64K	0.00	—	25.64K