CCI isn't the parent company of anybody. They're all owned by the same holding company.
TZZ is Israeli Military Industries, Tel Aviv, Israel.
MRP is Companhia Brasileira de Cartuchos, Santo Andre, Estado de San Paulo, Brazil, for Magtech Recreation Products, Inc., Las Vegas, Nevada (now Magtech Ammunition Company, Madison, Ct.
CBC is Companhia Brasileira de Cartuchos, Avenida Industrial No 3330, Santo Andre, Estado de Sâo Paulo, Brazil (ca'1997: Av Humberto de Compos 3220, 09400 000 Ribeirao Pires SP, Brazil)
CCC can be either Canyon Cartridge Company, 141 Albertson Ave, Albertson, NY, or Creedmoor Cartridge Co., Barberton, OH.
GECO is most likely Dynamit Nobel A/G, Troisdorf, Germany. But it can be Gustav Genschow & Company, Durlach, Germany, too. The latter may be owed by Nobel. Dunno for sure.
AD is either Komando Perindustrian TNI, Angkatan Darat, also known as Pabrik Senjata Mesiu, with ammunition factory at Turen, Maland, East Java or MAST Technologies, on ammo made for Abu Dhabi.
The odd 'D' in a circle or an 'O' can be a bunch of places. Prvi if it's an 'O'. Four places plus Dominion Cartridge Co. Different 'D' for them.
What lightman says is absolutely true. Everybody and his brother makes 9mm. Anyway for all things head stamp go here.
http://cartridgecollectors.org/?page=headstampcodes#C