On 22 March 2018, it was announced that Brothers Penrith would be fielding a team to compete in The Ron Massey Cup competition taking the place of The Auburn Warriors who became defunct.

The Sydney Shield side avoided the wooden spoon finishing second last above the Belrose Eagles.

[4] On 4 September 2022, Brothers Penrith reached the 2022 Sydney Shield grand final but were defeated 36-12 by St Mary's.

[5] On 14 September 2024, Brothers Penrith won their first Sydney Shield title defeating Wentworthville 43-18 in the grand final which was played at Leichhardt Oval.

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