The Nine Network has expanded to Western Australia, buying Bruce Gordon's WIN television in Perth.

The expansion comes as the broadcaster's parent, Nine Entertainment, readies for a $3 billion listing on the Australian share market, potentially before the end of the year.

Nine bought WIN Adelaide for $140 million earlier this year, and Tuesday's purchase, believed to be worth up to $200 million, expands the network's presence to five capital cities.

"Following detailed discussions with WIN proprietor Bruce Gordon and the completion of due diligence requirements, we are now in a position to finalise the contracts on this pivotal deal for the Nine Network," Nine Entertainment chief executive David Gyngell said in a statement.

David Mott, the former head of programming at Network Ten, has been appointed Nine Perth's managing director.

"He's coming home to help us build this market and really make an impact," Mr Gyngell said.

Meanwhile, Nine Entertainment's owners, US hedge funds Apollo Global Management and Oaktree Capital Management, are reportedly eyeing early December as the most logical time for a $3.3 billion float of Nine.

In January this year, Nine and its shareholders agreed to a $3.4 billion recapitalisation plan, which ended private equity group CVC Asia Pacific's stewardship of Nine.

While the timing and value of a public listing of Nine is yet to be confirmed, the proceeds would be used to repay shareholders and reduce the company's debt.

Nine Entertainment also owns NBN Television and Ticketek.