Elite New York firm Wachtell Lipton Rosen & Katz has been drawn into the controversy over the $187.5m (£103m) pay package of former New York Stock Exchange (NYSE) boss Richard Grasso.

In a lawsuit filed on 24 May by New York attorney general Eliot Spitzer, both Grasso and former NYSE compensation committee chairman Kenneth Langone are being sued for violations of New York corporation law.