Amazon shares are expected to slide 9% when Wall Street opens, as the online retailer's sales failed to meet analyst expectations over Christmas.
Social networking giant Facebook is set to begin the process of becoming a publicly listed company this week, with reported valuations of between $75bn (£48bn) and $100bn dwarfing Google's $1.9bn IPO in 2004.
After a rare earnings miss in Q3, normal service was resumed for Apple yesterday as the US tech giant's Q4 2011 profits easily beat analyst expectations.
Yahoo! shares look set to rise when Wall Street opens today following the resignation of co-founder Jerry Yang.
John Eisinger, manager of the top- performing £507m Janus US All Cap Growth fund, has upped his weighting to mid-cap technology companies but is avoiding some of the sector's giants.
Tech star Ben Rogoff has blamed the "formidable headwind" of small caps for a 5% fall in NAV for the Polar Capital Technology trust over the six months to 31 October 2011.
Nick Train, manager of the £333m Lindsell Train UK Equity fund, has said the most important development for equity markets in Q3 had nothing to do with Greece or the eurozone.