Which Company Is Behind Costco's Kirkland Brand Balsamic Vinegar?

Costco doesn't make its balsamic vinegar in-house. Instead, it partners with an established producer to do it for them: Acetum, which makes its vinegar in Modena, Italy.

Acetum, founded in 1906, is the largest producer of certified balsamic vinegar of Modena with Protected Geographical Indication, with over 6 million gallons produced annually.

Kirkland balsamic vinegar has the Protected Geographical Indication and the Balsamic Vinegar Consortium stamps, indicating high-quality ingredients and processing standards.