Players who chose to side with Steiner have access to two endings, making a total three possible endings. The ending of the game's campaign varies depending on which side of the civil war you have decided to support, as your help will ultimately sway the outcome of this conflict. After a certain point it will be impossible to keep taking missions from both sides of the war and your unit will be forced to choose an allegiance to one side or the other. When you take a mission you will earn points toward either Steiner or Davion loyalty in the FedCom civil war. There is a point system in this game's story similar to moral choice systems in other games. Furthermore there is Solaris VII, a 'Mech fighting sport planet that the player can participate in to earn more C-Bills and gain points towards Steiner or Davion factions. Players can now command a secondary lance, allowing up to eight 'Mechs to participate in a mission. The Free Market is introduced, allowing players to buy or sell unwanted 'Mechs and weapons. Your weekly costs to repair 'Mechs and drop into missions will increase based on the weight and number of your 'Mechs, but more advanced missions require heavier equipment, so striking a balance is very important in the campaign. The gameplay is based on using the money you earn by completing contracts to purchase new 'Mechs and weapons for you and your lancemates.

Gray Death Legion: A mercenary unit in the process of rebuilding, companies sponsored by the Legion gain early access to Lostech weapons and have greater purchasing power of these weapons.

Northwind Highlanders: A mercenary group with a Scottish ancestry, companies sponsored by the Highlanders start with more money and earn 20% more C-bills each mission.

Kell Hounds: Another famous mercenary company and a potential employer and ally in future missions, companies sponsored by the Kell Hounds have early access to Clan tech but do not start with it like the Dragoons do.

However they start with the least amount of money and Clan tech is very expensive.

Wolf Dragoons: One of the most famous mercenary companies, companies sponsored by the Dragoons start with Clan technology and have greater purchasing power of Clan tech.The player must choose one of four established mercenary units as a sponsor. Players assume the role of 'Spectre' a fledgling mercenary 'Mech pilot, as he attempts to start up his own mercenary company and achieve riches and fame. In MechWarrior 4: Mercenaries, you lead lances of 'Mechs into combat for private and House contracts for C-bills. The game mirrors Mechwarrior 2: Mercenaries with the ability to manage a mercenary company. Developed by Cyberlore Studios and published by Microsoft, Mechwarrior 4: Mercenaries is a standalone expansion to Mechwarrior 4: Vengeance.

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