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A so-called [[Codex Chapter]], meaning a Chapter which closely follows the doctrines of the [[Codex Astartes]], is made up of ten [[Space Marine Company|companies]], each consisting of one hundred Marines and commanded by an officer with the rank of [[Space Marine Captain|Captain]]. Below the Captain are two [[Lieutenant (Space Marine)|Lieutenant]]s which each command a Demi-Company.{{Fn|5}} Generally, the [[First Company]] is made up of the Chapter's most experienced [[Space Marine Veteran|Veteran]]s, while the Second through Ninth consist of more ordinary warriors. Some individual companies are specialised assault or support companies, possessing larger proportions of [[Assault Squad|Assault]], [[Devastator Squad|Devastator]], [[Hellblaster]], [[Eradicator Squad|Eradicator]]{{Fn|8}}, [[Aggressor]], [[Reiver]], and [[Inceptor]] squads. The tenth company is a [[Space Marine Scout|Scout]] force, made up of [[neophyte]] Space Marines not yet proven in battle. Typically, a standing force of 100 [[Vanguard Space Marine]]s are attached to the 10th Company.{{Fn|6}} The Chapter is further bolstered and supported by a [[Librarium]], [[Armoury]], [[Apothecarion]], [[Chaplaincy]], and [[Space Marine Fleet|Fleet]].{{Cite Marker EndFn|7}}

Each chapter is led by a [[chapter master]]. Unlike the [[Imperial Guard]], the Adeptus Astartes has no leadership above the masters of the individual chapters. Also unlike many other Imperial military forces, the Astartes were not historicallyu historically represented amongst the [[High Lords of Terra]]{{Fn|3b}} prior to [[Roboute Guilliman]] returning and declaring himself [[Lord Commander of the Imperium]] and [[Imperial Regent]].

Besides the Space Marine fighting brethren, there are many non-combat personnel, fully part of the chapter but generally not involved directly in combat. These include the chapter's [[Chapter Serf|serf]]s, [[astropath]]s, [[navigator]]s, etc.{{Cite Marker EndFn|7}}