The proposed $30 billion merger of Deutsche Börse and London Stock Exchange Group has won backing from two influential shareholder advisory services, even if Britain votes to exit the European Union.

Institutional Shareholder Services and Glass Lewis have in recent days sent notices to LSE investors supporting the deal, asserting that the stock exchange operators are a good fit. The recommendations by ISS and Glass Lewis are significant because LSE needs 75% of its shareholder base to approve the transaction at a meeting on July 4.