Fraser Beattie

Macmahon Holdings chief financial officer Sybrandt van Dyk has been promoted to the role of chief executive, following Ross Carroll’s resignation in January.

Engineering and construction firm Decmil Group has been selected to build a school in Christchurch for the New Zealand Ministry of Education.

Singapore-founded property crowdfunding business CoAssets wrapped up its first day of trading on the Newcastle-based National Stock Exchange of Australia today, with its shares closing flat at 10 cents each.

Last year's Business News Rising Stars winner, emergency response and security services provider Executive Risk Solutions, has taken the top prize as the 2015 Telstra Western Australian business of the year.

Perth-based Zeta Petroleum will acquire a substantial shareholding in oil explorer Oilex, when the company completes a planned $US23 million ($A30 million) capital raising.

Former VDM Group boss Andrew Broad has returned to his former employer, mining services business Ausdrill, and will become its chief operating officer of Australian operations.

Online advertising business Tech Mpire has made solid gains on its first day of trading on the ASX, after being acquired by Fortunis Resources in a $3.1 million backdoor listing.

Automotive Holdings Group has bought all three Mercedes-Benz dealerships in Perth from Western Pacific Automotive for a combined $58 million.

The Fiona Stanley Hospital has won the top prize at this year’s WA Architecture Awards, with Hassell, Hames Sharley and Silver Thomas Hanley commended for their design efforts.