# EDGAR Filing Document

**Accession Number:** 0001018963
**File Stem:** 0001193125-25-285373
**Filing Date:** 2025-11
**Character Count:** 9165
**Document Hash:** cbada2ba3463da411f76cc73967ee3dd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-285373.hdr.sgml**: 20251118

**ACCESSION NUMBER**: 0001193125-25-285373

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20251118

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251118

**DATE AS OF CHANGE**: 20251118

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ATI INC
- **CENTRAL INDEX KEY:** 0001018963
- **STANDARD INDUSTRIAL CLASSIFICATION:** STEEL PIPE & TUBES [3317]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 251792394
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1228

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-12001
- **FILM NUMBER:** 251492953

**BUSINESS ADDRESS:**
- **STREET 1:** 2021 MCKINNEY AVENUE
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75201
- **BUSINESS PHONE:** 4123942800

**MAIL ADDRESS:**
- **STREET 1:** 2021 MCKINNEY AVENUE
- **CITY:** DALLAS
- **STATE:** TX
- **ZIP:** 75201

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ALLEGHENY TECHNOLOGIES INC
- **DATE OF NAME CHANGE:** 19991213

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ALLEGHENY TELEDYNE INC
- **DATE OF NAME CHANGE:** 19960716

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, DC 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): November 18, 2025

## ATI Inc.

#### (Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **1-12001** | **25-1792394** |
| **(State or other jurisdiction** | **(Commission** | **(IRS Employer** |
| **of incorporation)** | **File Number)** | **Identification No.)** |

---

#### 2021 McKinney Avenue, Dallas, Texas 75201

#### (Address of principal executive offices) (Zip Code)

#### Registrant's telephone number, including area code (412) 394-2800

#### N/A

#### (Former name or former address, if changed since last report).
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (*see* General Instruction A.2. below):

☐ Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communication pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading<br>Symbol(s)** | **Name of each exchange<br>on which registered** |
| Common Stock, par value $0.10 per share | ATI | New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

#### Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
(b) On November 18, 2025, ATI Inc. (the "Company") announced that its Board of Directors (the "Board") has appointed Kimberly A. Fields, the Company's President and Chief Executive Officer, to become Board Chair effective May 14, 2026, at the Company's Annual Meeting of Stockholders. At that time, Robert S. Wetherbee, who currently serves as Executive Chairman, will retire as Executive Chairman and as a member of the Board.

The Company issued a press release on November 18, 2025 regarding these matters, which is attached as Exhibit 99.1 to this Form 8-K.

#### Item 9.01. Exhibit

---

| | |
|:---|:---|
| (d) | [Exhibit 99.1 Press release dated November 18, 2025.](d849921dex991.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

------

#### SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | |
|:---|:---|
| ATI Inc. | ATI Inc. |
| By: | /s/: Vaishali S. Bhatia |
|  | Vaishali S. Bhatia |
|  | Senior Vice President, General Counsel and Chief Compliance Officer |

---

Dated: November 18, 2025

## Exhibit 99.1

**Exhibit 99.1** 

---

| | |
|:---|:---|
| ![LOGO](g849921g1118054136874.jpg) | **NEWS**<br> **RELEASE** |

---

---

| | | |
|:---|:---|:---|
| ATI Inc. | **Investor Contact:** | **Media Contact:** |
| Corporate Headquarters | David Weston | Natalie Gillespie |
| 2021 McKinney Avenue, Suite 1100 | 412.394.2908 | 412.389.3124 |
| Dallas, TX 75201 U.S.A. | David.Weston@ATImaterials.com | Natalie.Gillespie@ATImaterials.com |
| www.ATImaterials.com |  |  |

---

**ATI President and CEO Kimberly A. Fields Elected Board Chair** 

*Robert S. Wetherbee to retire as Executive Chair and Board member* 

DALLAS, TX— November 18, 2025 — ATI Inc. (NYSE: ATI) announced that the Board of Directors has elected Kimberly A. Fields to become Board Chair of ATI, in addition to her roles as Chief Executive Officer and President. This appointment becomes effective May 14, 2026, at ATI's Annual Meeting of Shareholders. At that time, Robert S. Wetherbee will retire as Executive Chair and as a member of ATI's Board.

Fields has served as Chief Executive Officer since July 1, 2024, following a series of senior leadership roles, including both President and Chief Operating Officer, since 2019. She has been a director on the Company's Board since February 2024.

"With Kim as CEO, ATI has grown as an aerospace and defense powerhouse," said Wetherbee. "More than 70% of the company's revenues now come from these core markets. She's driving alignment across the businesses and strengthening operational advantages, increasing capacity and capabilities for the differentiated materials customers value most as the team expands customer partnerships.

"Kim is accelerating ATI's growth and value creation, with the team aligned to deliver," said Wetherbee.

"Combining the roles of CEO and Chair promotes unified leadership and direction for the Company," said Lead Independent Director Brett Harvey. "This move sharpens our leadership team's focus and ability to accelerate ATI's strategy of high performance and differentiation. The Board is confident ATI will grow shareholder value under Kim's leadership."

"I'm honored by the confidence the Board has placed in me," said Fields. "ATI is executing on a clear strategy and accelerating our leadership in aerospace and defense. By delivering the differentiated materials that enable our customers' extraordinary performance, we're driving sustainable growth and creating long-term value for our shareholders. I look forward to building on our momentum as we shape ATI's next chapter of growth and innovation.

"I also want to thank Bob for his exceptional leadership and partnership. Our team is strong, aligned, and ready to continue performing at the highest level."

Wetherbee has served as Executive Chairman since July 1, 2024, when he retired as ATI's CEO, a role he'd held since 2019. Under Wetherbee's leadership, ATI transformed to become an aerospace and defense leader, growing share and creating value for customers and shareholders.

"On behalf of the board and our shareholders, we thank Bob for all he's done, especially his focus on developing talent across the entire leadership team to ensure a smooth succession," said Brett Harvey, Lead Independent Director.

![LOGO](g849921g1118054137019.jpg)

------

**ATI: Proven to Perform** 

ATI (NYSE: ATI) is a producer of high-performance materials and solutions for the global aerospace and defense markets, and critical applications in electronics, medical and specialty energy. We're solving the world's most difficult challenges through materials science. We partner with our customers to deliver extraordinary materials that enable their greatest achievements: their products fly higher and faster, burn hotter, dive deeper, stand stronger and last longer. Our proprietary process technologies, unique customer partnerships and commitment to innovation deliver materials and solutions for today and the evermore challenging environments of tomorrow. We are proven to perform anywhere. Learn more at <u>ATImaterials.com</u>.

![LOGO](g849921g1118054137019.jpg)