ソース:[1] Robinhood、Bitstampの買収を完了 (https://www.robinhood.com/us/en/newsroom/robi ...)[2] Latham WatkinsがRobinhoodの買収を助言 (https://www.lw.com/en/news/2025/06/latham-wat ...)[3] Robinhood、Bitstampの買収を完了 (https://investors.robinhood.com/static-files/ ...)