B Corp.
If we agree that organizational culture has value, then we assume that when there is corporate acquisition that the culture is part of the purchase. The culture has valued and is sometimes even factored into purchase price. Indeed with some of the recent roll-ups of "green" companies by very not "green" new parents (Burt Bees by Clorox, Toms of Maine by Colgate) we assume that those cultures represent new opportunities.
Enter B Corporation by B Lab - a non-profit who helps maintain corporate culture through the only means necessary - Articles of Incorporation They say it best:
As a B Corporation™, you differentiate your business from the growing barrage of green- and cause-marketing campaigns and stand out as a leader in the market, creating a clear path for others to follow. You also embed your values into your corporate governing documents so they can survive new investors, new management and even new ownership.
Cool idea to protect the culture.