US stock-index futures cut losses after ADP

U.S. stock futures trimmed losses on Wednesday after data showing the addition of 213,000 jobs in September.

The private-payrolls report, which comes ahead of Friday's nonfarm-payrolls number for September, was roughly in line with expectations.

"What matters most about today's ADP report (specifics aside) is not that it was more or less in line but that by being in line, it reverses some of the ill will caused by the recently released consumer sentiment report," Dan Greenhaus, chief strategist at BTIG, wrote in emailed comments.

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Scott Mlyn | CNBC

The day's highlight will be preliminary ISM manufacturing data, which is seen showing a small decline in activity in September. There will also be construction spending for August.

Plus, JPMorgan Chase shares may wobble, after a federal judge warned on Tuesday that the bank could face a lawsuit from investors who claim they were misled about the safety of mortgage-backed securities sold before the financial crisis.

Outside of the U.S., Asian stocks were mixed as pro-democracy rallies in Hong Kong continued on Wednesday. Now in its fifth day, the mass campaign has spread to the city's Tsim Sha Tsui shopping district and is disrupting businesses.

Read MoreTraders lay their chips on Hong Kong protest plays

European markets also weakened, after Markit PMI data showed Germany's manufacturing sector contracted for the first time in 15 months in September.