No, Costco is not owned by Walmart. In fact, Costco and Walmart are two separate and competing retailers that operate in the same industry.

Costco is a membership-based warehouse club that was founded in 1983 in Seattle, Washington. The company operates in several countries around the world, including the United States, Canada, Mexico, the United Kingdom, Japan, South Korea, Taiwan, Australia, Spain, France, and Iceland. Costco is known for offering a wide variety of products at low prices, including groceries, electronics, clothing, and home goods.
On the other hand, Walmart is a multinational retail corporation that was founded in 1962 in Arkansas, United States. Walmart operates in 27 countries around the world, including the United States, Canada, Mexico, the United Kingdom, Brazil, China, and India. Walmart is known for offering a wide range of products at low prices, including groceries, electronics, clothing, and household goods.
While the two companies share some similarities in terms of the products they offer and their focus on low prices, they operate independently and are not owned by each other. In fact, the two companies are fierce competitors in the retail industry and are constantly vying for market share and consumer loyalty.
There are some rumors and misconceptions that suggest that Costco is owned by Walmart, but these claims are false. It is possible that these rumors have arisen because both companies are similar in terms of their business models and the products they offer. However, the two companies are separate entities with different ownership structures and management teams.
In conclusion, Costco is not owned by Walmart. These two companies are separate and competing retailers that operate in the same industry. While they share some similarities in terms of their product offerings and focus on low prices, they are not owned by each other and operate independently.