Clifford Chance, Orrick Herrington & Sutcliffe, Wachtell Lipton Rosen & Katz and White & Case are among 64 law firms to receive a perfect score in the Human Rights Campaign Foundation’s 2009 Corporate Equality Index, writes the Am Law Daily.

The total of 64 firms on this year’s list is more than five times the 12 top-scoring firms to make the foundation’s list in 2006, the first year law firms were invited to participate in the national survey.