Megacorporations

Arasaka, a Japanese zaibatsu conglomerate whose megalomaniacal CEO wishes to realize his dream of Japanese world power.
Biotechnica, an Italian biotechnology, pharmacology, and cybernetics firm.
Euro Business Machines (EBM), an information technology corporation (an obvious nod towards IBM).
Infocomp, a commercial think-tank and information repository.
Kendachi, a Japanese armament company.
Merril, Asukaga & Finch, financial analysts. Quite probably an allusion to Merrill Lynch
Microtech, a computer and electronics manufacturer.
Militech, American arms and mercenary contractor.
Mitsubishi-Sugo, a major transportation manufacturer.
Network News 54, an American broadcasting company.
Orbital Air, an African corporation with a monopoly on space transportation.
Petrochem, an energy company.
SovOil, a neo-Soviet oil giant, controlling a vast percentage of the petrochemicals market
Trauma Team International, a private medical firm.
World News Service, a worldwide news conglomerate, similar to the Associated Press.
WorldSat Communications Network, a satellite communications giant.
Zetatech, a computer, cyberdeck, robotics, and cybernetics manufacturing company.
Raven Micro-cyb, cybernetic design and manufacturers
Tsunami Arms, weapons design and manufacturing. Primarily weapons design
IHAG
CINO
REO Meatwagon – competitor to Trauma Team
Revolution Genetics – genetic engineering, specializing in agri-business genetics
Inmate Penal Corp – prison corporation, also acts as merc business
Lazarus – mercenary security and strategy think-tank
Con Ag – food and agricultural products company
Data-Tel – communications and personal electronics company
Tri-tech – tele-communications electronics company
Bodyweight – primarily net-runner support systems (i.e. biological support devices and systems)
Telectronics – personal electronics company
Micro-tech – workstation computer company, typically not decks but mainframes
Hydro-subsidium, underwater gear and supply company
Gibson Battlegear – clothing maker, markets to edgerunner community specifically solos
BMW
Harley Davidson
Kundalini Roadworks
New American Autoworks
GM/Hyundai
Bell Aeronautics
Sikorsky – Mitsubishi
Kiroshi – cybernetic optics design and manufacturer
Psiberstuff – cybernetics design and manufacturing.
Budgetarms – cheap weapons design and production
Malorian Arms – like Tsunami Arms, eye towards exotic and/or high-tech weapons
Colt
Taurus
H&K
Beretta
Fabrique Europa Nationale
Biotech – Askari, exotic weapons design and manufacturing
Rostovic – Sov-bloc weapons company
Techtronica – electronic weapons company
Federated Arms
Kendachi – japanese edged weapons company
Stein & Wasserman
Nu-tek – high tech clothing company
Tanaka – clothing company, primarily marketed towards high end corps
Eji of Japan – clothing company marketed towards techs and netrunners
Dynalar Technologies – same as Psiberstuff
DPI – rockerboy electronics, instruments etc
Rhinemetall – heavy weapons manufacturing.
IEC – electronics company, primarily house-hold devices and appliances. some cybernetic and other electronics as well
McDonnel & Douglas – military vehicles mostly
Boeing
Lockheed Martin
Eagletech – archery weapons design and manufacturing.
Dai Lung – Oriental weapons company, specializing in cheap weapons

TC Enfield – Based in United Kingdom.
Thompson Contender merged with Enfield, under TC Enfield. TC Enfield caters mainly to the civilian arms market. However, TC Enfield has had one recent success with a military grade firearm.

MOX (Modified Ordinance Experts) – Based in Metropolis.
MOX originally designed accessories for Glock, until it finally purchased Glock outright. MOX primarily designs arms for the military/law enforcement community. MOX also performs custom modifications on most weapons, including the Hawk/Chandler Hybrid. MOX is known worldwide for high-tech firearms and accessories. Currently partnered with Concept Arms for design/development.

Hawk/Chandler Arms
Hawk/Chandler is a sister company to MOX. Hawk/Chandler efforts are directed at selling to the civilian market, primarily handguns. Hawk/Chandler’s main weapon is Hybrid.

MACE (McCormick Armaments and Custom Engineering) – Based in America.
Chip McCormick, a world renowned arms modifier, organized a company that outright purchased Kimber and Colt Arms. During this time, Colt was forced to sell its Armalite Division to GE.

H & K-Benelli (Heckler & Koch) – Based in Germany.
The least changed arms company, in the current world. H & K manufacturers a wide range of weapons, primarily for the military/law enforcement community. H & K-Benelli is the current version of Colt Arms, being a standard weapon worldwide.

Midnighte Arms – Based in Metropolis
Midnighte Arms is involved in a ongoing argument with MOX. At one point, MOX was a wholly owned subsidiary of Midnighte Arms. However, a conflict between the senior partners lead to the split up of the two companies. Midnighte Arms also caters to the military weaponry market.

ROMAK (Romanian AK Company) – Based in Eastern Europe
ROMAK is a conglomeration of Dragunov and Kalishinkov, two companies historically aligned with Russian/Soviet Bloc countries. ROMAK continues to manufacture the ever-popular AK line of guns, including the new AKP.

Orbital Arms Corporation – Based in Earth Orbit.
Orbital Arms is a relatively new company in the market. Oddily, OAC has two conflicting opinions. The first is that they make sub-standard, mass-produced firearms whose only selling point is their unique looks. However, OAC also is the world’s leading manufacturer of 100% custom designed firearms.

Sturm
Sturm reorganized during the mass purge of companies, dropping the Ruger identity from its corporate name. Sturm continues to put out weapons based on the Ruger designs to this day.

Concept Arms – Based in Metropolis
Concept Arms is a custom design weapons company, primarily dealing in concept and design of firearms. During the shift of mass-mergers of weapons companies, Steyr re-named itself to Concept Arms, keeping selected weapons under its original name. Concept Arms very rarely markets a firearm under its own name, preferring to sell the license and the concept to other companies. The sole exception to this are the
Steyr line of guns, including the Aug. Concept Arms is partnered with MOX and Hawk/Chandler Arms.

Barren Manufacturing – Based on Mars
After the dust settled from the mass bankrupting and mergers of armament companies, BM emerged as the corporate raider. BM made a practice of outright purchasing and in some cases, stealing the older concepts. Included in this are the IMI and FN lines. BM is primarily noted for creating bizarre combinations of its previously existing weapons. BM is also noted for the lack of new design lines, choosing not to spend money in new product research, but in modifications development.

General Firearms – Based in America
General Firearms is one of the truly massive powerhouses in the military arms market. As military weapons systems are its only product, GF is the single largest provider of large scale military weapons, including PA and tracked armor weaponry. GF purchased Armalite from Colt during its bankruptcy and continues to re-design/re-manufacture the venerable M-16 line to this day.