The May Company was founded in 1763 with the express purpose of trade with the old The Austro Germanic Union, they soon became famous for being the first British company to use rifling and interchangeable parts. In the more modern day they are known to make Lee Enfield's, the modern bombers, heavy cruisers and the battleships. Their fire arms are known to be extremely sturdy, their planes are known to be surprising tough able to take more damage then expected and their ships are well known for accurate fire with some of the best radar and targeting systems the British can make. It is known to have a history will undercutting the market and is the only company to faced the 5 kingdoms government in the court and had to sell off control of subside company called Sainsbury which had at the time a near monopoly (in 1924) on the food market which the government could not allow. They are still known today for expansion policy investing in a third of all start ups and trying to always gain up a leg up on the opponents in mostly legal ways.

Founded in 1882 original for the construction of Vickers pattern machine gun they would be the first British company during the great war to come up with a working tank design (the mk2) and helping in the war of 1890 allowing the ending of the stalemate on the Goa front. In more modern times, their work on the Sten Machine gun, the Churchill tank, Matilda tank, the gladiator jet fighter, the thunder bolt close air support and the normal aircraft carrier design. Their guns are well known for a high rate of fire weather it be on their tanks, in the hands of the infantry or even on their planes. Their aircraft are known for speed while their carriers are specifically known for a spot of luck being able to take hits that would have destroyed or crippled most any of carriers of its size and yet they always are able to limb away.

Founded in 2014 the youngest official of the major companies it has it hands less in the direct production and more supplying the raw materials. Known for their decent rations, vast merchant fleet and large stocks of foreign weapons its only major products for the 5 kingdoms government are the designs and the construction of the super aircraft carrier and the crusader light tank. This company origins are most concerning it seemed to be a mere front group for the organized crime elements that dwell in under London it is believed that upto 10 percent of the world terrorists, pirates and freedom fighter groups buy their arms from the imperial corporation not to mention its well known secret of drug peddling that though not illegal in the 5 kingdoms is looked down upon by the public.

This company founded in 1907 is an expert at medium ship construction with destroyers and light cruisers their best. famed for tough hulls and advance missile defense system. It is rumored they have even discovered a effective way to counter supersonic missiles. They have been also known to sell to lets say less "legal" clients in the past earning the label as the "pirates builders" yet their quality of their products cannot be denied.

This company founded in 1935 is well known for making tanks that break the British convention such as super heavily armored archer well known for it being hard to repair or the lighting fast devil light tank which completely lacks a main gun but instead had a nothing more but a missile pod in its turret. If its British and looks weird then the commonwealth company is most likely behind it.

Founded in 1957 they focused mostly on the at the time the relatively new jet engine, famed for pushing the envelope in the region of the jet engine. They came up with what became known as the merlin turbine which help to lower the cost of British jet engines while making them more reliable in the 1974. In 2010 while working with the British Space Agency they helped to designed and launch satellites. Now a days it focused on aircraft and the emerging space sector.