Metallus Inc. (MTUS) CEO reports planned share sales and holdings update

Rhea-AI Filing Summary

Metallus Inc. chief executive officer and director reports stock sales under a pre-arranged trading plan. On December 17, 2025, the reporting person sold 8,428 common shares of Metallus Inc. at a weighted average price of $19.04, leaving 722,279 shares beneficially owned afterward. On December 18, 2025, a further 5,609 common shares were sold at a weighted average price of $19.07, resulting in 716,670 shares beneficially owned following that transaction.

All of these sales were made pursuant to a written Rule 10b5-1 trading plan that the reporting person adopted on May 23, 2025, which is designed to satisfy the affirmative defense conditions under Exchange Act Rule 10b5-1(c).

Insider Trade Summary

Net Seller: 14,037 shares ($267,433)

Net Sell 2 txns

Insider Williams Michael S

Role Chief Executive Officer

Sold 14,037 shs ($267K)

Type	Security	Shares	Price	Value
Sale	Common Shares	5,609	$19.07	$107K
Sale	Common Shares	8,428	$19.04	$160K

Holdings After Transaction: Common Shares — 716,670 shares (Direct)

Footnotes (1)

1. Price reported is the weighted average sale price for shares sold by the reporting owner on December 17, 2025. Shares were sold at a variety of prices ranging from $19.00 to $19.1257. Price reported is the weighted average sale price for shares sold by the reporting owner on December 18, 2025. Shares were sold at a variety of prices ranging from $19.00 to $19.16.

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Williams Michael S

(Last) (First) (Middle)

1835 DUEBER AVE. SW

(Street)

CANTON OH 44706

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Metallus Inc. [ MTUS ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
12/17/2025

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

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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Shares	12/17/2025		S		8,428	D	$19.04(1)	722,279	D
Common Shares	12/18/2025		S		5,609	D	$19.07(2)	716,670	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Price reported is the weighted average sale price for shares sold by the reporting owner on December 17, 2025. Shares were sold at a variety of prices ranging from $19.00 to $19.1257.

2. Price reported is the weighted average sale price for shares sold by the reporting owner on December 18, 2025. Shares were sold at a variety of prices ranging from $19.00 to $19.16.

Remarks:

The reporting person adopted a written plan for the sale of the Company's common shares intended to satisfy the affirmative defense conditions of Exchange Act Rule 10b5-1(c) on May 23, 2025. All transactions reported herein were made pursuant to that plan.

	/s/ Kristine C. Syrvalin, as Attorney-in-Fact	12/18/2025
	** 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 4 (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.

FAQ

What insider trades did Metallus Inc. (MTUS) report in this Form 4?

The filing reports that the Metallus Inc. chief executive officer and director sold 8,428 common shares on December 17, 2025 at a weighted average price of $19.04, and 5,609 common shares on December 18, 2025 at a weighted average price of $19.07.

How many Metallus Inc. (MTUS) shares does the insider hold after these transactions?

After selling shares on December 17, 2025, the reporting person beneficially owned 722,279 common shares. Following the additional sale on December 18, 2025, the beneficial ownership position was 716,670 common shares, held directly.

Were the Metallus Inc. (MTUS) insider sales made under a Rule 10b5-1 trading plan?

Yes. The filing states that the reporting person adopted a written plan for the sale of Metallus Inc. common shares intended to satisfy the affirmative defense conditions of Exchange Act Rule 10b5-1(c) on May 23, 2025, and that all reported transactions were made pursuant to that plan.

What prices were received for the Metallus Inc. (MTUS) share sales?

The $19.04 price reported for the December 17, 2025 sale and the $19.07 price reported for the December 18, 2025 sale are weighted average sale prices. The filing explains that individual shares on December 17 traded in a range from $19.00 to $19.1257, and on December 18 in a range from $19.00 to $19.16.

What is the role of the reporting person at Metallus Inc. (MTUS)?

The reporting person is identified as both a director and an officer of Metallus Inc., serving as the company’s Chief Executive Officer.

Is this Metallus Inc. (MTUS) Form 4 filed for one insider or multiple insiders?

The form is indicated as being filed by one reporting person, not by more than one reporting person.