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Chemist Warehouse could account for at least four billionaires, and up to six individuals with stakes potentially worth more than $900m, new documents show.

Meanwhile, Westpac’s new chief executive, Anthony Miller, has prioritised a major technology push in a bid to simplify the bank’s business and has called for a national effort to help more Australians buy their own homes.

And from his vantage point on the Trump resort patio in Palm Beach this weekend, the editor of The Australian's The Richest 250 magazine, John Stensholt, saw an incoming president feted by some of the biggest names in the US and the world, including Elon Musk and Apple boss Tim Cook.