Nomura Holdings Inc., the parent firm of Nomura Securities Co., said Wednesday it has formed an alliance with U.S. investment bank Thomas Weisel Partners Group LLC to coordinate cross-border mergers and acquisitions activity between Japan and the United States.

Under the deal, Nomura will make a $200 million strategic investment in Thomas Weisel Partners and its affiliates.

Of the $200 million, $75 million will be invested in Thomas Weisel Partners and $125 million in private equity initiatives sponsored by the U.S. investment bank, Nomura said.