The rejection comes on the basis that it neither reflects the fundamental value of the Company nor represents compelling value for exclusive due diligence.
The offer was $3.40 cash per share by way of a scheme of arrangement.
The company advised Partners Group is was willing to engage further with them to explore the prospect of a superior proposal.
Shares in Healius (ASX:HLS) are trading 8.86 per cent lower at $2.47.