Asian stocks were mixed on Wednesday, with Japanese indices falling back sharply as a Hillary "bump" after Monday's Presidential debate abated.

In Hong Kong Postal Savings Bank of China made a disappointing debut after raising $7.4 billion the world's biggest IPO of the year and the shares ended where they had started at HK$4.76.

In Tokyo financial services were among the main losers, including Mitsubishi UFJ and Sumitomo Mitsui Financial, as were exporters, including Mitsui Chemicals (MITUY) .

U.S. futures slipped, with Dow Jones futures down 0.04% and the S&P 500 down 0.06%.

The Nikkei 225 closed down 1.31% at 16,465.40 and the Topix fell 1.37% to 1,330.77. The indices had risen 0.70% and 0.80%, respectively, on Tuesday after Hillary Clinton was widely perceived to have beaten Republican opponent Donald Trump in the first televised debate between the Presidential candidates.

The dollar was up 0.15% against the yen at ¥100.5800.

Hang Seng was down 0.43% at 23,470.37.

The CSI 300 was down 0.14% at 3,236.30.

The S&P/ASX 200 was up 0.12% at 5,412.40.

Oil edged higher, with the West Texas intermediate  recently up 0.11% at $44.72.