Gun makers are again the center of a national debate over how to put an end to mass shootings, and their stocks are trading like things are different this time.
Several major U.S. companies have dropped their associations with the National Rifle Association in the last few days, less than two weeks after a 19 year old with a semi-automatic rifle killed 17 people in a high school in Florida. Student protests and calls for action have stayed in the headlines, and politicians are under pressure to enact new gun safety rules.
As with deadly shootings in the past, some of the focus has been on the companies that make the weapons and ammunition and the people and companies that own them. Shareholder activism on gun control tends to flourish in the weeks following an incident and then fade away, if history is any guide.