Which companies manufacture the drug acthar gel?

Who makes Acthar Gel (repository corticotropin injection)?

Acthar Gel is manufactured by Mallinckrodt Pharmaceuticals (under the brand name Acthar). [1]

Any other companies that manufacture Acthar Gel?

Based on the provided information, Mallinckrodt Pharmaceuticals is the manufacturer listed for Acthar Gel. [1]

Are there different manufacturers for different strengths or markets?

The provided information identifies Mallinckrodt Pharmaceuticals as the manufacturer, without naming different manufacturers by strength or geography. [1]

Sources

[1] https://www.drugs.com/availability/acthar-gel.html