SIG Sauer AG is a Swiss manufacturer of armaments.

[1] It was known as SIG Arms AG before 2000 when it was acquired by the German investors Michael Lüke and Thomas Ortmeier from parent company Schweizerische Industrie Gesellschaft.

[2][3] The company is now part of L&O Holding, which also owns the German-based SIG Sauer GmbH & Co. KG and the US-based Sig Sauer Inc.[4] The SIG "Schweizerische Industrie Gesellschaft" was founded as "Schweizerische Waggon-Fabrik bei Schaffhausen".

Production of arms started in 1860 at the request of the Swiss Army.

The Castelli-Moser family from Zürich owns a small part of the company.