The company addresses complex environmental issues for large industries, including steel, railways, and energy.

[2] In 2018, Harsco acquired Altek,[3] a UK producer of aluminum processing equipment.

[4] In April 2020, Harsco Corporation acquired the Environmental Solutions business (ESOL) from Stericycle, Inc.[5] The company finally rebranded as Enviri in 2023.

Additional subsidiary companies include Altek, SteelPhalt, and Black Beauty Abrasives.

Harsco reported total sales of USD $1.89 billion in fiscal year 2022.