H.I.G. Capital, a private equity firm, has given $219,495 to the Mitt Romney campaign this year, making it one of Romney's largest contributors, larger than Bain Capital, Romney's old firm. H.I.G. is at least the partial owner of Binder and Binder, the largest entity representing Social Security disability claimants. H.I.G. may also have given money to independent groups supporting Romney but that information is not available to the public.