More than three dozen companies have filed an amicus brief in support of plaintiffs challenging Florida's ban on gay marriage.

A judge's ruling ordering the state to begin issuing marriage licenses to gay couples is expected to take effect on January 6.

While Florida officials defending the ban were unable to persuade either the Eleventh Circuit Court of Appeals in Atlanta or the Supreme Court to block implementation of the ruling, they have yet to drop an appeal in the case.

“State laws and constitutions denying marriage to gay and lesbian citizens are bad for our businesses,” the companies wrote in their friend-of-the-court brief filed last week. “Amici are forced to bear unnecessary costs, complexity and risk in managing our companies, and we are hampered in our efforts to recruit and retain the most talented workforce possible – all of which places us at a competitive disadvantage.”

“The burden – imposed by state law – of having to administer complicated schemes designed to account for different treatment of similarly situated employees interferes with our business and creates unnecessary confusion, tension, and ultimately, diminishes employee morale.”

Companies joining the brief include Akamai Technologies, Alcoa, Amazon, AT&T, CBS Corp., Cox Enterprises, Delta Air Lines, Deutsche Bank, eBay, Electronic Arts, First Equity, Garvin Financial Group, General Electric, Joint Force Management Group, Kimpton Hotel & Restaurant Group, Levi Strauss, Marriott International, MD/DO Recruiters, Mindpower, Oracle America, Oracle Corp., Pfizer, Pridelines Youth Services, Professional Asset Recovery of GA, Reserva Wines, Rockwell Automation, SHS Management, Staples, State Street Corp., Sun Life Financial, Sun Life Financial Services Company, Symantec Corp., Target Corp., Team 7 Consulting, United Therapeutics Corp., Viacom and Whey Natural! USA.

The Eleventh Circuit is expected to review the case early next year.

(Related: Supreme Court has “tipped its hand” in favor of gay marriage.)