In 1912, MacCallum Smith became sole proprietor and managing director, remaining in that role until 1935, as well as being a member of the Western Australian Legislative Assembly for 20 years.

In 1935, a syndicate led by Jack Simons and including Victor Courtney and mining entrepreneur Claude de Bernales purchased Western Press Limited, the publisher of the paper, for £55,000.

To counter decreasing demand for newspapers and competition from radio, television and internet news, The Sunday Times has made adaptations in style and presentation.

[18] Western Australia's diminutive population has not enjoyed a competitive Sunday newspaper since The Independent was bought out by News Limited in 1984 and wound up in May 1986.

A joint venture between the two companies produced many suburban papers under the Community Newspapers banner until Seven West Media bought the remaining stake in 2019.

[21] On 30 April 2008, members of the police fraud squad conducted a raid on the offices of The Sunday Times—an unusual event for Australian mainstream media—following a state government complaint that confidential cabinet information had been leaked to the paper.