Tuesday's was the S&P's worst drop since August 24.
Monday's drop followed an 8.5 per cent slump in Chinese markets.
Software developers who tried on an Apple Watch for the first time on Friday predicted a rush of new apps over the next few months.
The Apple Watch goes on sale around the world on Friday.
Apple's stock market value rose beyond $700 billion.
Industry analysts were broadly excited at the prospect, but sceptical that it could produce a working model at a mass-market price that soon.
The chipmaker also promised to hire more women
The president's moves will make it easier for entrepreneurs to work in the United States
Microsoft Corp announced its 'Windows 10' operating system on Tuesday to replace the largely unpopular Windows 8, skipping a number to mark a leap toward unifying the way people work on tablets, phones and traditional computers.
Ellison and the two new co-CEOs each stressed that nothing would change under the new management structure, with Ellison staying on as executive chairman and chief technology officer.
Users seem to like the idea too: in a recent survey by technology consultancy IHS, 83 per cent were interested in wireless charging; in China, the figure was 91 per cent.
Apple Inc's embrace of wireless charging for its new Watch may be a defining moment for a technology that's languished for years amid competing standards and consumer confusion.
Has Steve Jobs' handpicked successor inherited the magic touch or is Apple's winning streak coming to an end?
Stephen Elop, the former Nokia CEO who now runs Microsoft's devices business, showed off the phone in front of thousands at the company's annual employee meeting in Seattle on Monday.
Hopes to win over tablet users and placate PC customers alienated by the new operating system.
The chipmaker's Clover Trail+ mobile chip will be used in one version of its 10.1-inch tablet.
Its Windows 8 system has shown no growth at all, disappointing investors.
He will look at early stage software, Internet, and tech companies.
According to the Seattle-based Society of Professional Engineering Employees in Aerospace, its 'professional' members -- who perform the main engineering duties on Boeing planes -- voted narrowly in favor of accepting the contract, while a smaller group of "technical" members -- who support the engineers -- voted to reject it. Both groups voted in favor of authorizing the union to call a strike.
The move puts it in competition with Apple, Amazon and Google.
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