Top business executives have gotten even more Republican, study finds

U.S. boardrooms have become more Republican and more partisan over the past decade, according to a new study.

The study, published last month in the National Bureau of Economic Research, drew on voter registration data on more than 3,700 executives from nearly a thousand S&P 1500 firms. And it comes as corporations are under pressure to take stands on politically charged issues such as voting rights, gun violence and abortion.