US Markets

NYSE invokes Rule 48 for third straight day: Dow futures imply higher open

US stocks in correction, set for higher open

U.S. stock index futures pointed to a sharply higher open on Wednesday after a highly-volatile session for China's Shanghai Composite, with investors left largely unimpressed by the stimulus measures from the People's Bank of China.

The New York Stock Exchange invoked Rule 48 for a third straight session, after implementing the rule on Monday and Tuesday, Dow Jones reported. The goal of the rule is to ease market volatility.

Before this week, Rule 48 was most recently invoked in January 2015. In all, Rule 48 has been invoked 67 times since it was approved in 2007, according to an NYSE spokeswoman. The goal of the rule is to ease market volatility.

Futures extended gains, with the Dow indicating a higher open, rising more than 350 points and implying a plus-450 point open after China's central bank said on Wednesday it had injected 140 billion yuan ($21.8 billion) into the interbank money market via short-term liquidity operations (SLOs).

The Peoples' Bank of China fired a double-barrelled easing shot on Tuesday—lowering interest rates and the reserve requirement ratio (RRR) by 25 basis points and 50 basis points respectively—but this was not enough to reassure markets of slowing growth fears.

Investors are finding it difficult to know which direction to turn, with global indices flipping wildly between gains and losses after brutal selling seen at the start of the week. China's benchmark Shanghai Composite finished down 1.3 percent after fluctuating throughout the day.

Read MoreTraders spooked after head fake rally, watching Fed speak

Trader on the floor of the New York Stock Exchange.
Brendan McDermid | Reuters

Investor confidence has waned amid these continued concerns about the world's second largest economy. In the U.S, stocks surged in a "head fake" rally Tuesday, sending the Dow 441 points higher, before gains were wiped out and the market traded sharply lower into the close.

In the last week-and-a-half, the has lost nearly $2 trillion in market capitalization, with $900 billion lost in this week's two trading sessions alone.

Read MoreRout latest: Europe shares sink; Shanghai seesaws

Wednesday's markets are expected to take their cue again from the action in China, but there will also be plenty of speculation about the Fed and when it might raise rates.

New York Fed President William Dudley speaks to the press on the regional economy before taking questions at a 10 a.m. ET event. Dudley speaks ahead of the Jackson Hole Fed symposium at the end of the week, where Fed Vice Chair Stanley Fischer will address the group Saturday.

European stock markets traded over 2 percent lower in early deals on Wednesday after a rebound yesterday, giving traders little respite from this week's big market swings.

On the data front in the U.S., durable good orders for July rose 2.2 percent, above the expected 0.1 percent rise, but down from the 3.4 percent gain last month.

Major earnings include reports from Royal Bank of Canada, Brown-Forman, Abercrombie & Fitch, Chico's FAS before market open. Avago Technologies, Williams-Sonoma and Workday, are all due after the bell.

Correction: This story has been updated to reflect that Rule 48 was last invoked in January 2015, not during the financial crisis, according to NYSE.