A new study shows more publicly held companies are adopting stronger measures to disclose their spending on political campaigns.

The authors of the ninth annual CPA-Zicklin Index report attribute the trend to corporations not wanting to be burned in today’s “incendiary political climate.” The index is a joint project between the Center for Political Accountability in Washington, D.C., and the Zicklin Center for Business Ethics Research at the Wharton School of the University of Pennsylvania.