| Σ | # | Presentation | Description | Related |
| 10 | 4749 | ⟨a, b | abba=b, baab=a⟩ | Finite non-commutative monoid with 25 elements | |
| 10 | 6381 | ⟨a, b | aab=a, bbbbb=b⟩ | Finite non-commutative monoid with 25 elements | 1 iso |
| 10 | 6536 | ⟨a, b | aaa=a, aaba=bb⟩ | Finite non-commutative monoid with 25 elements | |
| 11 | 11133 | ⟨a, b | aaaaa=b, bbbbb=1⟩ | Isomorphic to ℤ25 | 3 iso |
| 11 | 14342 | ⟨a, b | aaaa=a, aabba=b⟩ | Finite non-commutative monoid with 25 elements | |
| 11 | 14869 | ⟨a, b | abba=b, bbabb=a⟩ | Finite non-commutative monoid with 25 elements | 2 iso |
| 11 | 19706 | ⟨a, b | aba=b, aaaaa=bb⟩ | Finite non-commutative monoid with 25 elements | |