Core Natural Resources CFO holds 1,590 shares

Core Natural Resources, Inc. (CNR) reported an initial insider ownership filing for Tucker Nathan Joseph, its SVP & Chief Financial Officer.

Rhea-AI Filing Summary

Core Natural Resources, Inc. (CNR) reported an initial insider ownership filing for Tucker Nathan Joseph, its SVP & Chief Financial Officer. He reports direct beneficial ownership of 1,590 shares of common stock, including 690 unvested restricted stock units, each representing a contingent right to receive one share of common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Tucker Nathan Joseph

Role SVP & Chief Financial Officer

Type	Security	Shares	Price	Value
holding	Common Stock F1	--	--	--

Holdings After Transaction: Common Stock — 1,590 shares (Direct)

Footnotes (1)

1. F1. Of the 1,590 shares reported, 690 are unvested restricted stock units that will vest in accordance with the terms of the applicable award agreement. Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

Key Figures

Total common shares beneficially owned: 1,590 shares Unvested restricted stock units: 690 units Ownership type: Direct

3 metrics

Total common shares beneficially owned 1,590 shares Direct holdings reported by the CNR CFO on Form 3

Unvested restricted stock units 690 units Portion of total reported holdings subject to vesting

Ownership type Direct All reported holdings are directly owned by the reporting person

Key Terms

restricted stock units, contingent right, beneficial ownership

3 terms

restricted stock units financial

"690 are unvested restricted stock units that will vest in accordance"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

contingent right financial

"Each restricted stock unit represents a contingent right to receive"

beneficial ownership financial

"initial statement of beneficial ownership of securities"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider ownership did CNR CFO Tucker Nathan Joseph report on his Form 3?

Tucker Nathan Joseph reported 1,590 shares of Core Natural Resources, Inc. (CNR) common stock as of this Form 3. Of these, 690 shares are unvested restricted stock units that may convert into common stock according to their award agreement terms.

How many unvested restricted stock units does the CNR CFO hold?

The CNR CFO holds 690 unvested restricted stock units. Each unit represents a contingent right to receive one share of Core Natural Resources, Inc. common stock, vesting in accordance with the terms of the applicable award agreement.

Are the CNR CFO’s reported CNR shares held directly or indirectly?

All reported holdings are directly owned by the CNR CFO. The Form 3 identifies ownership type as direct, and includes both currently held common stock and unvested restricted stock units within the total reported share count.

Does this CNR Form 3 show any insider buying or selling activity?

This Form 3 does not report any buy or sell transactions. It is an initial statement of beneficial ownership, listing the CNR CFO’s total direct holdings, including unvested restricted stock units, without indicating recent acquisitions or dispositions.

What does each restricted stock unit reported by the CNR CFO represent?

Each restricted stock unit represents a contingent right to receive one share of Core Natural Resources, Inc. common stock. These 690 units will vest and potentially convert into shares in line with the terms of the applicable award agreement.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/20/2026 - 11:18 AM EDT Accepted by SEC EDGAR 08/20/2026 - 11:18 AM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Tucker Nathan Joseph

(Last) (First) (Middle)

275 TECHNOLOGY DRIVE

SUITE 101

(Street)

CANONSBURG PENNSYLVANIA 15317

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
08/18/2026

3. Issuer Name and Ticker or Trading Symbol
Core Natural Resources, Inc. [ CNR ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP & Chief Financial Officer

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	1,590(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Of the 1,590 shares reported, 690 are unvested restricted stock units that will vest in accordance with the terms of the applicable award agreement. Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

Remarks:

	/s/ Rosemary L. Klein, Attorney-in-Fact for Nathan J. Tucker	08/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)