A week after voters in four states expressed their support for laws allowing same-sex marriage, the country’s largest lesbian, gay, bisexual and transgender advocacy group is giving its own approval to dozens of the nation’s largest law firms for their LGBT–friendly policies.

The Human Rights Campaign released its 2013 Corporate Equality Index Wednesday, rating 889 employers across about 40 industries on a scale of 0 to 100 based on a range of criteria that include whether they have equal employment opportunity policies based on sexual orientation and gender identity and provisions in their insurance coverage that apply to same-sex partners.