1

M31 - The chapter is (or claims to be) from the Second Founding

2-5

M32

6-10

M33

11-20

M34

21-30

M35

31-45

M36 - This chapter was born from the so-called 'Cursed Founding'

46-55

M37

56-65

M38

66-75

M39

76-85

M40

86-95

M41 - The 26th and last known Firstborn Founding; No Primaris Marines are known to have gone renegade

96-100

An unknown founding