Terms of the deal were not disclosed. South Korean media reported in June that the transaction would likely be worth about 500 billion won ($335 million).
The deal is expected to give Hyundai Motor Group greater strategic flexibility to manage Boston Dynamics, allowing the automaker to make long-term decisions on investments, business strategy and a potential initial public offering.
Hyundai plans to begin deploying Atlas, Boston Dynamics' humanoid robot, at a manufacturing plant in Georgia in the US from 2028.
The robot will initially handle parts-sequencing tasks, with its role likely to be expanded to a broader range of manufacturing processes, including component assembly by 2030.
The acquisition comes as Hyundai Motor's South Korean labor union has intensified industrial action over annual wage negotiations, after staging two-hour partial strikes from July 13 to 15 and revealing plans for four-hour strikes from last Monday through Wednesday, according to Yonhap News Agency.
