They’re the House that I find the least interesting and thus I excluded them from my project. :)
Boooooo! I'm going to provide a list of Marik worlds anyway.
ATREUS: Capital of the League, it is also the home of important aerospace and naval construction facilities, and two important FWLM training facilities in the Atreus Officer Training College and the Athene School of Combat, the League's premier infantry and battle armor academy.
ORIENTE: The beating heart of the Duchy of the same name, Oriente lacks any heavy military industry but is part and parcel of House Marik's political bloc in Parliament and fields a massive BattleMech force for a province - 12 regiments in 3057 - which makes it an important brick in the League both politically and militarily.
IRIAN: Irian is home of the eponymous mega corporation, which produces interstellar media, industrial and commercial products, battle armor, and BattleMechs. The company runs the planet, giving it wide discretionary powers and immense influence in Parliament.
KEYSTONE: The envy of Irian, Earthwerks' facilities on Keystone are the single largest Mech manufacturing center in the Free Worlds League. Not only is it prolific, but also varied, producing a comparatively wide selection of Mechs.
ANDURIEN: Despite its fractious nature, the capital of the Duchy of Andurien is ruled by the politically powerful and savvy Humphreys family. Despite the failed secession of the 3030s, the Humphreys maintained their wealth and power and in the chaos of the Jihad were able to successfully withdraw from the League.
REGULUS: The Princes of Regulus have traditionally been opponents of House Marik. Regulus itself is an important trading hub, and Regulans are known for their financial prowess. It lacks any heavy industries, but Aiutaki Academy produces excellent MechWarriors.
KENDALL: Kendall is a heavily industrialized planet on the Periphery border. Facing constant raids from pirates and Marians, its Mech and tank factories make it a valuable prize, and its distance from the main centers of military power make it difficult to defend.
STEWART: Similar to Oriente, Stewart has been a long time ally of House Marik in the internecine Parliamentary battles of the League and indeed the Stewart's and Mariks intermarried in the early 3000s. Stewart is the home of Corean Enterprises, an important Mech manufacturer, and a small but well-equipped Mech brigade in the form of the Stewart Dragoons.
TAMARIND: Rarely a power player in League politics, Tamarind is nonetheless an important world. This is due in large part to its naval industries, producing JumpShips, JumpShip sails, and in the 3050s, WarShips. In the Jihad, it climbed to further prominence due to the secession of Therese Marik and her loyal followers against the False Thomas Mariks.
KALIDASA: Kalidasa is a key world along the League-Lyran border. Site of Kali-Yama, which produces Hunchbacks and Orions (and later on, the Perseus OmniMech), it is also a key member of the Silver Hawks Coalition, whose small provincial military ranges wildly in quality but is quite fierce in its patriotic fervor.