Avery Gardiner, co-president of the Brady Campaign, said her organization reached out to the administration and wrote a letter to Attorney General Jeff Sessions offering their expertise after Parkland, but they never heard back.

With little movement in Congress, gun control advocates are turning to the private sector to drum up support for their cause. A new report from the Brady Campaign to Prevent Gun Violence has found that corporate America is increasingly taking a stance on firearms policy.

Avery Gardiner, co-president of the Brady Campaign, said the shareholder move appears to be unprecedented.

"I'm not aware of any other shareholder resolutions that deal with gun violence ever passing," she told CNNMoney. "They are making this something where they are literally putting their money where their mouth is."

The AR-15 is a weapon that evokes quite a deal of emotion. After every mass shooting in America,​ it's plastered on the news and hotly debated. But what is it? Why is it a favorite of mass shooters? And how do we talk about it in today's polarized environment? Kyleanne Hunter, the VP of Programs for the Brady Campaign, explains.