MINNEAPOLIS — The legal, business information and media company Thomson Reuters said Friday that an amendment to ban gay marriage in Minnesota would be bad for business.

Prominent companies including General Mills and St. Jude Medical spoke out earlier against the proposed amendment, which goes to the voters in November. Minnesota already has a law against gay marriage, but gay marriage opponents say the amendment is necessary to put the ban in the state constitution.

In a statement, Thomson Reuters said it doesn’t believe the amendment “would be good for Thomson Reuters or the business community in the state.”

Spokesman John Shaughnessy said Thomson Reuters, headquartered in New York City, has almost 8,000 employees in Minnesota, most based in the Minneapolis suburb of Eagan, and 60,000 around the world. “We believe the Minnesota Marriage Amendment, if passed, would limit our ability to recruit and retain top talent,” several Minnesota-based company executives wrote in an email to employees.

The company, which includes Reuters news agency, tried to clarify why it was weighing in on the issue, saying its statement was not a political or religious position. “Rather, our perspective on the Amendment is a business position,” the email said.