McCrae will vote its shares in favour of the transaction. As well as shareholder approval, the deal needs clearance from the Overseas Investment Office. A shareholder vote of the Hg deal and the buyback is expected to be held by late September, it said. They will be furnished with an independent report from KordaMentha.
"This investment provides Orion Health with a tremendous opportunity to deliver on our vision for customers, our people and for the healthcare sector," CEO McCrae said.
"We received strong interest in Orion Health's business throughout the strategic review process and the board and I believe that Hg is the right partner to accelerate the expansion of Rhapsody and support our vision for Population Health."
Hg would make the investment via its Mercury 2 Fund, Orion said.
Hg's proposal values Orion at an enterprise value of $255m, it said, made up $205m for Rhapsody and $50m for Population Health. That implies a per-share price of $1.24 to $1.29. The buyback would be at $1.28 after fees. Orion shares soared 27 per cent to $1.08 today.
Orion Health went public in late 2014, attracting a $915m valuation in the initial public offering which sold at $5.70 apiece. The software company had been profitable but chose to forgo earnings in the short-term to build a globally significant business.
In April this year, Orion said revenue missed its guidance as delayed contracts for pushing those sales into the next financial year. At the same time as the profit warning, it announced plans to save as much as $30m a year from an operational restructure, having already trimmed $10m of annual costs when it shrank its workforce to 1,050 from 1,200.