In October 2007 US nonfinancial corporations had accumulated assets totaling $17.6 trillion. Two years later they were barely above $13 trillion, having lost over $4.5 trillion during the recession. Between that 2009 low point and today, corporations have gained every bit of the value in assets back.
There really is no way to understand capitalism today, or capitalism in history, without acknowledging the growth of corporations within the US economy and society over the last three to four decades. I am not for a reflexively anti-corporate political stance, but for being realistic about corporate dominance of US social structure.