Apple shares have soared to a new high after the US company won a patent lawsuit against Samsung, which saw the South Korean company's stock tumble.
Apple jumped 1.88 per cent to close at $US675.68 on Monday, giving it a record market value of $US633 billion ($A610 billion), reinforcing its place as the world's most valuable company.
Google shares slipped amid concerns its Android operating system used on mobile devices made by Samsung and others would come under greater scrutiny.
After Friday's court ruling, Apple on Monday filed a court request seeking to ban eight Samsung mobile phones in the US.
The patent case did not include Samsung's newest Galaxy S III, which was released subsequent to the suit, but which is facing separate litigation.
Patent law consultant Florian Mueller said Apple "will push for an injunction that will have an open-ended wording and include any product, even products that haven't been released yet, that infringes the same intellectual property".
Analysts said Friday's court verdict ordering Samsung to pay Apple more than $US1 billion for patent infringement bodes well for the Silicon Valley firm.
"We believe this verdict strengthens Apple's already strong competitive position in the smartphone and tablet markets ahead of upcoming key product launches such as the iPhone 5," said Michael Walkley at Canaccord Genuity.
Apple, which is widely expected to announce a new version of its iPhone in September and possibly a smaller version of its market-leading iPad, has been riding strong momentum.
Katy Huberty at Morgan Stanley said "the bigger win for Apple is the competitive ramifications if other smartphone vendors experience lengthened product cycles and are forced to alter their software and hardware to ensure unique designs relative to Apple products."
Samsung shares slumped 7.5 per cent in Seoul, the biggest single-day percentage drop the electronics giant has seen in nearly four years.
Google shares dropped 1.39 per cent to $US669.22.
Google, which was not a party in the case but is affected because of its Android system used in Samsung devices, said in a statement the patent claims would be reviewed on appeal and that "most of these don't relate to the core Android operating system".
"We work with our partners to give consumers innovative and affordable products, and we don't want anything to limit that," Google said.
US District Judge Lucy Koh has set a hearing for September 20 to consider injunctions against Samsung devices. She will also hear Samsung motions to reduce or dismiss charges and Apple's request for "punitive" damages, which could triple the award.
There were reports that US consumers were snapping up Samsung devices in anticipation of a possible ban.
"Customers rushed to buy Samsung Galaxy S III this weekend, with some stores reporting stock outs," said Trip Chowdhry at Global Equities Research.
Other firms which might benefit from Android woes also rose.
Microsoft, readying a push for new Windows-powered devices, added 0.43 per cent to $US30.69 and beleaguered BlackBerry maker Research in Motion advanced 1.7 per cent to $US7.06.