Koches, Waltons, Mars's, Johnson's, Newhouses, Catgill-Macmillans, Coxes, Pritzkers, Hearsts.

The first link is shot through with holes, I would not know where to start. The Fed's Survey of Consumer Finances says otherwise.

The second link is obvious on the face of it - in a country with 325 million people, if you look at 11 million firms, the majority are not run by 1%ers. The data parameters make the outcome a foregone conclusion. Of course the owner of the median firm out of 11 million will be more middle class than the heirs who own a lot of stock in Walmart.