From The Truth About Guns:

The nuisance move was put forward by a small group of anti-gun shareholders led by a group of nuns from Oregon. Normally it wouldn’t have had a prayer of passing, but the proposal was made in the aftermath of the Parkland shooting. As a result, some of Ruger’s large institutional shareholders like BlackRock and Vanguard Group signed on in order participate in the growing corporate gun control movement and to signal how terribly concerned they were about “gun violence.”