General Dynamics (U.S. defense contractor) - owns:
the St. Marks Powder
plant in Crawfordville Florida - makes Hodgdon/Winchester ball powders, Alliant Power Pro, IMR Enduron powders, some Accurate powders;
the Energetic Materials
plant in Valleyfield Qeubec Canada - makes IMR single base powders, some rimfire and shotgun powders.
Groupe SNPE (French State-owned) owns:
plant in Laukaa Finland - makes Vihtavouri powders;
plant in Kariskoga Sweden - makes much of the Reloder line, as well as the Norma line;
Poudrerie de Clermont
plant in Belgium France - makes Ramshot.
Thales Group (French company) owns:
Thales Australia Limited/Australian Defense Industries/Australian Munitions
plant in Mulwala New South Wales Australia - makes ADI powders, Hodgdon Extreme powders, and some IMR/Winchester powders.
Rheinmetall Defence (German defense contractor) - owns:
plant in Wimmis Switzerland - makes Reloder-17 and 26.
Hodgdon brand (not a manufacturer) - Owns IMR brand, and holds the license for Winchester brand.
Alliant Techsystems (ATK) (U.S. defense contractor) - Owns the Alliant name, doesn't manufacture Alliant Reloder powder.
British Aerospace Systems (BAE) - Operates Radford Army Ammunition Plant
in Radford Virginia (Unknown what if any civilian canister powders currently produced).
ATK, BAE, and Olin Corp. in joint venture as U.S. Munitions LLC (U.S. defense contractor) - Operates Lake City Army Ammunition Plant
in Independence Missouri (Unknown what if any civilian canister powders currently produced).