Most of the performance aftermarket is owned by Holley Performance / Sentinel Capital Partners private equity firm, and by Industrial Opportunity Partners (IOP) private equity firm which owns Edelbrock Group which I think includes Comp cams.
Edelbrock Group companies include Edelbrock, Comp cams, FAST, TCI, Russel performance, Lunati cams, and MagnaFuel
Holley Performance brands include MSD Performance, Flowmaster, Hurst, Nitrous Oxide Systems (NOS), Weiand, Flowtech, Earl's Performance Plumbing, Hooker Headers, Demon Carburetion, Racepak, Superchips, Diablosport, Edge Products, Accel Ignition, Quick Time, Hays Clutches, Mr. Gasket, Lakewood, Mallory Ignition, B&M, APR and Dinan.