The conversation between human and AI assistant.
[|Human|] From the passage below, extract the names of the companies and technologies that Walmart has acquired over the last 3 years.
[|AI|] Walmart acquired Volt Systems in August 2022. Volt Systems focuses on vendor management and product tracking. They also acquired technology from Thunder Industries in February 2021 to create digital advertisements.
[|Human|] 
From the passage below, extract the names of the companies and technologies that Walmart has acquired over the last 3 years.