PerimeterX, Inc. announced that it has received $57 million in a round of funding led by new investor AllianceBernstein Holding L.P. (NYSE:AB) on January 31, 2021. The transaction included participation from new investors Stereo Capital, Golden Arc Capital, Inc., JS Capital, returning investors Adams Street Partners, LLC, Canaan Partners, Deutsche Telekom Capital Partners Management GmbH, Scale Management, LLC and Vertex Ventures.