Some large minority shareholders, most notably Crest Financial and Aurelius Capital, have vehemently opposed the Sprint bid, saying it undervalued Clearwire. Aurelius sued Clearwire's directors last month, and Crest launched a proxy contest this week to block the deal. But ISS said the Sprint offer looked fairly valued and that Clearwire appeared "increasingly unviable on a stand-alone basis." The firm also said certain governance provisions give Sprint an effective veto over other options anyway.