The financial sector has dipped for the second day in a row, dragging down the overall Australian share market.

The benchmark S&P/ASX200 index was down 9.6 points, or 0.14 per cent, to 6,648.4 points at 1200 AEST on Wednesday, while the broader All Ordinaries was down 10.9 points, or 0.16 per cent, to 6,723.6.

All four big banks were lower, with ANZ down 0.84 per cent to $28.21, Commonwealth down 0.39 per cent to $82.06, NAB down 0.47 per cent to $26.725, and Westpac down 0.65 per cent to $28.095.

The other heavyweight sector – materials – was flat with big miners mixed.

BHP was down 0.11 per cent to $41.195 but Rio Tinto was up 0.50 per cent to $102.89 and Fortescue Metals was up 0.17 per cent to $8.745.

Fletcher Building was up 0.20 per cent after the New Zealand-based company forecast lower than expected annual earnings from its Australian arm.

Property trusts and utilities, down 0.68 per cent and 0.52 per cent respectively, had the sharpest losses by midday.

Afterpay Touch was up 4.82 per cent to $26.96 despite the buy-now, pay-later firm saying it was delaying its $30 million share purchase plan until the completion of a regulator-mandated probe.

The Aussie dollar is buying 69.61 US cents, from 69.60 US cents on Tuesday.