The Swiss private equity firm offered A$3.40 per share in cash, a 23.2% premium to Healius’ last closing price.
A filing earlier in the day showed Partners bought out China’s Jangho Group Co Ltd’s 15.9% majority stake in Healius.
Jangho had previously offered to buyout Healius for A$1.7 billion or A$3.25 per share, which was rejected by the Sydney-based company, saying it was “opportunistic” and fundamentally undervalued the company.
The company said it has not yet formed a view on Partners’ offer, adding that it was also subject to six weeks of due diligence.
Healius’ share had jumped nearly 24% in 2019.