European tech stocks fell sharply Monday as investors trimmed risk in the sector around the world following last week's pullback on Wall Street and the biggest single-day decline for Apple  (APPL) in more than a year. 

The Stoxx Europe 600 Technology index, the sector benchmark, was marked 2.5% lower in the opening hour of trading, its biggest single-day decline in more than eight months, as shares in SAP SE  (SAP - Get Report) (-1.1%), Infineon Technologies AG (IFNNY) (-2.7%) and ASML NV (ASML - Get Report) , Europe's largest supplier to computer chip makers, (-3.25%) held down the sector.

Apple's European supply chain was also under pressure, with shares in Switzerland's AMS AG (AMSSY) , a maker of optical sensors for iPhones, slumping more than 6%  the biggest fall since early April, to change hands at Sfr64.25 in Zurich.

Italy's STMicroelectronics NV (STM - Get Report) , which provides the phone's accelerometers, gyroscopes and motion sensors, fell more than 6.5% to change hands at €14.34 in Milan. Shares in Germany's Dialog Semiconductor, which provides power management systems for Apple, was down 4.06% to change hands at €41.65.

Imagination Technologies (IGNMF) , a British designer of graphical processing units used in smartphones, dropped 0.83% in the first hour of trading Monday. The stock has lost 54% over the past three months after Apple, its largest customer, said it would stop using its technology within 15 to 24 months.

Happy Monday, Tim Cook.
Happy Monday, Tim Cook.

Apple shares are expected to fall a further 1.6% at the opening bell on Wall Street Monday, according to pre-market trading, with a starting price of $146.58. Shares of the tech giant were downgraded on Sunday.

The slump for Apple would follow Friday's 3.88% decline, the biggest in 14 months, after a Goldman Sachs note said that low volatility in Facebook Inc.  (FB - Get Report) , Amazon Inc. (AMZN - Get Report) , Microsoft (MSFT - Get Report) and Google parent Alphabet (GOOGL - Get Report) may be blinding investors to risks including regulation and cyclicality.

Facebook is expected to fall a further 1.02% after Friday's 3.3% slump, while Alphabet's shares are likely to open little-changed at $970 each.

Facebook, Amazon and Alphabet are holdings in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells FB , AMZN, and GOOGL ? Learn more now .

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