144 0001638813 XXXXXXXX LIVE 0001598428 Metallus Inc. 001-36313 1835 DUEBER AVENUE SW CANTON OH 44706-0928 330-471-7000 WESTBROOKS KRISTOPHER R Officer COMMON MERRILL LYNCH

3455 PEACHTREE RD NE SUITE 1000 ATLANTA GA 30326

11812 230511.18 43154816 02/27/2024 NEW YORK COMMON 02/27/2024 EXERCISE OF NQ STOCK OPTIONS METALLUS INC N 11812 02/27/2024 COMPENSATORY PAYMENT N KRISTOPER WESTBROOKS

1835 DUEBER AVE SW CANTON OH 44706

COMMON 11/27/2023 11812 241948.91 KRISTOPHER WESTBROOKS

1835 DUEBER AVE SW CANTON OH 44706

COMMON 12/18/2023 7657 176111.00 KRISTOPHER WESTBROOKS

1835 DUEBER AVE SW CANTON OH 44706

COMMON 12/27/2023 15949 384417.00 KRISTOPHER WESTBROOKS

1835 DUEBER AVE SW CANTON OH 44706

COMMON 01/29/2024 11812 243611.63 02/27/2024 08/29/2023 KRISTOPHER WESTBROOKS