Law firm Slater & Gordon has voluntarily suspended its shares from trading as it prepares to declare an impairment on its troubled UK business.
The company's first half results are scheduled for Monday, but on Wednesday it said it had not finalised the impairment on the value of the UK business it acquired for about $1.3 billion in 2015.
"There are certain material items in the half year results which are not yet finalised, including, as foreshadowed in December, testing and assessment of the goodwill values for impairment of the UK business," company secretary Moana Weir said in a statement on Wednesday.
"SGH considers it appropriate that it enters into voluntary suspension so that it can manage its continuous disclosure obligations ... and to avoid trading in its shares happening on a basis that is not reasonably informed."
The company expects to announce its results between the close of trade on Friday and the start of trade at 1000 AEDT on Monday.
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Slater and Gordon shares have tumbled about 90 per cent since the acquisition of UK firm Quindell's professional services business less than a year ago.
The embattled law firm withdrew its profit guidance in December and a month later backtracked on a plan to update investors on cashflow.
"Management weren't wrong in describing the deal as transformational," Motley Fool's Tom Richardson wrote in an investor update.
Slater and Gordon's shares plummeted from an all-time high of $8.07 to 53.5 cents in January on concerns about the company's accounts and UK proposals to clamp down on personal injury claims.
The stock last traded at 83 cents.
In November, Slater and Gordon told investors spooked by the need for adjustments and corrections to its financial results that it was on track to meet its full year guidance despite being cash flow negative in the first half.
It withdrew the guidance a month later, launched a review into how it forecasts its figures and promised to update investors in January.
It then scrapped that plan and said the cashflow update would be included in its first half results on February 29.
