Michael S. Williams - 01 Mar 2026 Form 4 Insider Report for Metallus Inc. (MTUS)

Role: Chief Executive Officer, Director
Signature: /s/ Kristine C. Syrvalin, as Attorney-in-Fact
Issuer symbol: MTUS
Transactions as of: 01 Mar 2026
Net transactions value: -$495,108
Form type: 4
Filing time: 02 Mar 2026, 21:00:02 UTC
Previous filing: 12 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Williams Michael S	Chief Executive Officer, Director	1835 DUEBER AVE. SW, CANTON	/s/ Kristine C. Syrvalin, as Attorney-in-Fact	02 Mar 2026	0001554176

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MTUS	Common Shares	Tax liability	$495,108	-29,124	-4.2%	$17.00	656,758	01 Mar 2026	Direct
transaction	MTUS	Common Shares	Award	$0	+78,100	+12%	$0.000000	734,858	02 Mar 2026	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The reported transaction is an award of restricted stock units which will vest in full on March 2, 2029, subject to the terms of the grant agreement.