# EDGAR Filing Document

**Accession Number:** 0001710366
**File Stem:** 0001193125-25-234041
**Filing Date:** 2025-10
**Character Count:** 18879
**Document Hash:** e7a31bb09e2c1baf0fcae90c0beb8aa5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-234041.hdr.sgml**: 20251008

**ACCESSION NUMBER**: 0001193125-25-234041

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20251006

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

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251008

**DATE AS OF CHANGE**: 20251008

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Core Natural Resources, Inc.
- **CENTRAL INDEX KEY:** 0001710366
- **STANDARD INDUSTRIAL CLASSIFICATION:** BITUMINOUS COAL & LIGNITE MINING [1220]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DC
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38147
- **FILM NUMBER:** 251381263

**BUSINESS ADDRESS:**
- **STREET 1:** 275 TECHNOLOGY DRIVE
- **STREET 2:** SUITE #101
- **CITY:** CANONSBURG
- **STATE:** PA
- **ZIP:** 15317
- **BUSINESS PHONE:** 724-416-8300

**MAIL ADDRESS:**
- **STREET 1:** 275 TECHNOLOGY DRIVE
- **STREET 2:** SUITE #101
- **CITY:** CANONSBURG
- **STATE:** PA
- **ZIP:** 15317

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CONSOL Energy Inc.
- **DATE OF NAME CHANGE:** 20171128

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CONSOL Mining Corp
- **DATE OF NAME CHANGE:** 20170626

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

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 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): October 6, 2025

## Core Natural Resources, Inc.

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

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-38147** | **82-1954058** |
| **(State or other jurisdiction**<br> **of incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **275 Technology Drive, Suite 101**<br> **Canonsburg, Pennsylvania** | **15317** |
| **(Address of principal executive offices)** | **(Zip Code)** |

---

#### Registrant's telephone number, including area code:
(724) 416-8300

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:

☐ Written communications 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 communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications 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, $0.01 par value | CNR | 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 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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. ☐

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#### Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On October 6, 2025 (the "Transition Date"), the Board of Directors (the "Board") of Core Natural Resources, Inc. (the "Company" or "Core") appointed James A. Brock to serve as the Company's Chief Executive Officer ("CEO"), effective immediately. Mr. Brock will continue to serve as Chair of the Board.

Mr. Brock's biography was included in the Definitive Proxy Statement for the Company's 2025 Annual Meeting of Stockholders filed with the U.S. Securities and Exchange Commission on March 17, 2025, and is incorporated herein by reference.

On the Transition Date, Paul A. Lang separated from service with the Company and resigned as a member of the Board. Mr. Lang is entitled to the payments under his letter agreement dated April 30, 2020 (the "Letter Agreement"), vesting under his restricted stock unit ("RSU") agreements and has agreed to provide transition consulting services through the end of the year.

The Company and Mr. Lang are expected to enter into a Separation and Release Agreement (the "Separation Agreement") pursuant to which the Company and Mr. Lang will mutually agree that Mr. Lang will transition to a consultant role from the Transition Date through December 31, 2025 (the "Consulting Period"). Pursuant to the Separation Agreement, subject to Mr. Lang executing a general release and waiver of claims against the Company, Mr. Lang will receive a lump sum cash payment of $7,950,553 (plus 18 months of COBRA premiums and 36 months of life insurance premiums) in satisfaction of the Company's obligations under the Letter Agreement. Additionally, Mr. Lang's outstanding time-vesting RSUs will be settled in accordance with the terms of the applicable RSU agreements, and Mr. Lang's outstanding performance-based RSUs will be settled with a cash payment in an amount equal to (i) the number of performance-based RSUs that would have been settled assuming target performance multiplied by (ii) $88.45 (the closing price of the Company's common stock on October 6, 2025).

Mr. Lang is also entitled to reimbursement for costs incurred in relocating his residence within the continental United States. The Company will also pay Mr. Lang's base salary during the Consulting Period.

Mr. Lang continues to be bound by the confidentiality and restrictive covenant provisions set forth in the Letter Agreement, which provides for non-competition and non-solicitation restrictions for one year following the Transition Date and restrictions on the disclosure and use of confidential information at any time following the Transition Date.

The foregoing description of the Separation Agreement does not purport to be complete and will be qualified in its entirety by reference to the text of the Separation Agreement.

#### Item 7.01 Regulation FD Disclosure.
On October 8, 2025, the Company issued a press release announcing the appointment of Mr. Brock as CEO and departure of Mr. Lang, which is furnished as Exhibit 99.1 hereto and is incorporated herein by reference.

The information contained in this Item 7.01 and the Exhibit 99.1 shall be considered "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, nor shall it be deemed incorporated by reference into any reports or filings with the SEC, whether made before or after the date hereof, except as expressly set forth by specific reference in such a filing.

#### Item 9.01 Financial Statements and Exhibits.
*(d) Exhibits.* 

---

| | |
|:---|:---|
| **Exhibit<br>No.** | **Description** |
| 99.1 | [Press release of Core Natural Resources, Inc. dated October 8, 2025](d66172dex991.htm) |
| 104 | Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101) |

---

------

#### SIGNATURES
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.

---

| | |
|:---|:---|
| **CORE NATURAL RESOURCES, INC.** | **CORE NATURAL RESOURCES, INC.** |
| By: | /s/ Miteshkumar B. Thakkar |
|  | Miteshkumar B. Thakkar |
|  | Chief Financial Officer and President |

---

Dated: October 8, 2025

## Exhibit 99.1

**Exhibit 99.1**![LOGO](g66172g1008033731851.jpg)

**Core Natural Resources Announces Leadership Change** 

**CANONSBURG, PA (October 8, 2025**) – Today, Core Natural Resources, Inc. (NYSE: CNR) ("Core," the "company," "we" or "our") announced that its board of directors has appointed Core's board chair, Jimmy Brock, to the additional role of chief executive officer, effective immediately. He succeeds Paul A. Lang, who is departing as CEO and board member. Brock will work closely with Lang, who has agreed to provide transition consulting services through the end of the year, as well as with the board and the management team, to ensure a seamless transition.

"I am excited to take on this expanded leadership role at a pivotal time in Core's innovation and growth," Brock said. "With its world-class operating portfolio, diversified product slate, strategic logistical network, and talented workforce, Core is positioned for tremendous growth and success in the years ahead. I look forward to working with the board and the rest of the management team to deliver operational excellence and industry-leading stockholder returns."

Brock has served as executive chair of the Core Natural Resources board since January 14, 2025, when Core was formed via a merger between Arch Resources and CONSOL Energy. Prior to that time, Brock served as chairman and chief executive officer of CONSOL Energy.

"On behalf of the board, management team, and Core employees, we want to thank Paul for his great leadership in helping execute the merger and steer the integration process over the course of the past nine months," Brock said. "He has helped lay a strong foundation for future success, and we wish him the very best in his future pursuits."

**Brock Biography** 

Brock was elected CEO and board member of CONSOL Energy in 2017 and added the role of chairman to his CONSOL Energy responsibilities in 2024. During his more than 40 years in the industry, he has held the positions of chief operating officer, superintendent, longwall coordinator, and mine foreman. He currently serves as board chair of America's Power and the Pennsylvania Coal Alliance, and is a member of the executive committee (and past board chair) of the National Mining Association. He is also a past board chair of the West Virgina Coal Association.

**About Core Natural Resources, Inc.** 

Core Natural Resources, Inc. (NYSE: CNR) is a world-class producer of high-quality metallurgical and high calorific value thermal coals for the global marketplace. Core's highly skilled workforce operates a best-in-sector portfolio of large-scale, low-cost longwall mines, including the Pennsylvania Mining Complex, Leer, Leer South, and West Elk mines, along with one of the world's largest and most productive surface mines, Black Thunder. The company plays an essential role in meeting the world's growing need for steel, infrastructure, and energy, while simultaneously serving the resurgent requirements of the U.S. power generation fleet. Core has an extensive and strategic logistical network – anchored by ownership positions in two East Coast marine export terminals – that provides reliable and efficient access to seaborne coal markets. The company's deeply ingrained culture is grounded in safety and compliance, continuous improvement, and financial performance, with an emphasis on stakeholder engagement and stockholder returns. Core was created in January 2025 via the merger of long-time industry leaders CONSOL Energy and Arch Resources and is based in Canonsburg, Pennsylvania.

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**Contacts:** 

Investor:

Deck Slone, (314) 994-2766

deckslone@coreresources.com

Media:

Erica Fisher, (724) 416-8292

ericafisher@coreresources.com

**Cautionary Statement Regarding Forward-Looking Statements** 

This communication contains certain "forward-looking statements" within the meaning of federal securities laws. Forward-looking statements may be identified by words such as "years ahead," "look forward" and similar expressions. Forward-looking statements are not statements of historical fact and reflect Core's current views about future events. No assurances can be given that the forward-looking statements contained in this communication will occur as projected, and actual results may differ materially from those projected. Forward-looking statements are based on current expectations, estimates and assumptions that involve a number of risks and uncertainties that could cause actual results to differ materially from those projected. These risks and uncertainties include, without limitation, risks related to the recently announced CEO transition, risks related to the prior occurrence of combustion-related activity at Core's Leer South mine and the risk of future occurrences; the increase in combustion-related gases at Core's Leer South mine; Core's ability to resume development work at Leer South with continuous miners and longwall development in accordance with its expected timing; deterioration in economic conditions (including continued inflation) or changes in consumption patterns of our customers may decrease demand for our products, impair our ability to collect customer receivables and impair our ability to access capital; volatility and wide fluctuation in coal prices based upon a number of factors beyond our control; an extended decline in the prices we receive for our coal affecting our operating results and cash flows; significant downtime of our equipment or inability to obtain equipment, parts or raw materials; decreases in the availability of, or increases in the price of, commodities or capital equipment used in our coal mining operations; our reliance on major customers, our ability to collect payment from our customers and uncertainty in connection with our customer contracts; our inability to acquire additional coal reserves or resources that are economically recoverable; alternative steel production technologies that may reduce demand for our coal; the availability and reliability of transportation facilities and other systems that deliver our coal to market and fluctuations in transportation costs; a loss of our competitive position; foreign currency fluctuations that could adversely affect the competitiveness of our coal abroad; the risks related to the fact that a significant portion of our production is sold in international markets (and may grow) and our compliance with export control and anti-corruption laws; coal users switching to other fuels in order to comply with various environmental standards related to coal combustion emissions; the impact of current and future regulations to address climate change, the discharge, disposal and clean-up of hazardous substances and wastes and employee health and safety on our operating costs as well as on the market for coal; the risks inherent in coal operations, including being subject to unexpected disruptions caused by adverse geological conditions, equipment failure, delays in moving out longwall equipment, railroad derailments, security breaches or terroristic acts and other hazards, delays in the completion of significant construction or repair of equipment, fires, explosions, seismic activities, accidents and weather conditions; our inability to manage our operational footprint in response to changes in demand; failure to obtain or renew surety bonds or insurance coverages on acceptable terms; the effects of coordinating our operations with oil and natural gas drillers and distributors operating on our land; our inability to obtain financing for capital expenditures on satisfactory terms; the effects of our securities being excluded from certain investment funds as a result of environmental, social and governance practices; the effects of global conflicts on commodity prices and supply chains; the effect of new or existing laws, regulations, tariffs, executive orders or other trade measures; our inability to find suitable joint venture partners or acquisition targets or integrating the operations of future acquisitions into our operations; obtaining, maintaining and renewing governmental permits and approvals for our coal operations; the effects of asset retirement obligations, employee-related long-term liabilities and certain other liabilities; uncertainties in estimating our economically recoverable coal reserves; defects in our chain of title for our undeveloped reserves or failure to acquire additional property to perfect our title to coal rights; the outcomes of various legal proceedings, including those that are more fully described herein; the risk of our debt agreements, our debt and changes in interest rates affecting our operating results and cash flows; information theft, data corruption, operational disruption and/or financial loss resulting from a terrorist attack or cyber incident; the potential failure to retain and attract qualified personnel of the company; failure to maintain effective internal control over financial reporting; uncertainty with respect to the company's common stock, potential stock price volatility and future dilution; uncertainty regarding the timing and value of any dividends we may declare;

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uncertainty as to whether we will repurchase shares of our common stock; inability of stockholders to bring legal action against us in any forum other than the state courts of Delaware; the risk that the businesses of the company and Arch Resources, Inc. will not be integrated successfully; the risk that the anticipated benefits of the merger may not be realized or may take longer to realize than expected; the risks related to new or existing tariffs and other trade measures; and other unforeseen factors.

All such factors are difficult to predict, are beyond Core's control, and are subject to additional risks and uncertainties, including those detailed in Core's annual report on Form 10-K for the year ended December 31, 2024, quarterly reports on Form 10-Q, and current reports on Form 8-K that are available on Core's website at www.corenaturalresources.com and on the SEC's website at http://www.sec.gov.

Forward-looking statements are based on the estimates and opinions of management at the time the statements are made. Core does not undertake any obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by law. Readers are cautioned not to place undue reliance on these forward-looking statements that speak only as of the date hereof.