At noon AEDT on Friday, the benchmark S&P200 was down 43.5 points, or 0.61 per cent, to 7,043.8, while the broader All Ordinaries was 40.9 points lower, or 0.56 per cent, to 7,256.8.
Every sector was lower, with tech the worst performer after a fall of 1.7 per cent.
The heavyweight mining sector was down 0.7 per cent, with BHP dropping 0.5 per cent, Fortescue down 0.4 per cent and Rio Tinto retreating 0.8 per cent.
The big four banks were all in the red, with CBA down 0.8 per cent, Westpac and ANZ down 0.4 per cent and NAB dipping 0.3 per cent.
Premier Investments was up 1.8 per cent to $24.84 as chairman Solomon Lew told shareholders that Black Friday week delivered a record sales result for the Just Jeans, Smiggle and Peter Alexander brand owner.
"As we have always said around this time of year, the all-important Christmas, Boxing Day and back to school trading periods are still ahead, which are all significant drivers for the first-half result," Mr Lew said, adding the group was well positioned for this critical trading period.
The Australian dollar was buying 66.19 US cents, from 66.49 US cents at Thursday's ASX close.
Since last Friday's close, the ASX200 was up 0.1 per cent, making it a close call whether it would finish in the green or the red.