Tremors in tech stocks spread to Europe on Wednesday, with weaker metals prices also tripping up a rally in world stocks which had taken them to record highs.

Investors concerned about high valuations took the top off the tech sector, where stocks such as Facebook, Alphabet, Tencent and Alibaba have reached prices some describe as "eye-watering".

Europe's main index of stocks tumbled 0.7 per cent, led by chipmakers which have been a crucial driver of growth in the sector and seen stellar share price gains this year.

Ken Hsia, European equities portfolio manager at Investec Asset Management, said he had shifted positioning this year from tech into other sectors, including financials, which he thought would gain from higher yields and fiscal shrinking.

“Their valuations needed something more heroic in terms of the earnings growth they were reporting, and we sold some and rotated that into other parts of the market,” he said.

Debate on US tax Bill

Another negative for the tech sector was a detail of the US tax cut Bill being debated in Congress limiting the scope of tax credit key for research and development.

MSCI's world equity index, which tracks shares in 47 countries, slipped 0.3 per cent, still holding near its latest record high hit a week ago.

US market volatility was up again in early trading, its eighth day of gains in the last ten sessions as investors grew more jittery about stock markets driven to pricey levels by widespread enthusiasm about the economy.

“We really don't see great bargains in any market right now with the US trading at 18.2x price to earnings and 14 per cent above its average, and Europe at 15.1x, 10 per cent ahead of the average,” said Jefferies analysts in a note.

Metals lose shine

European markets mirrored Asian trading where MSCI's index of Asia-Pacific shares outside Japan dropped 1.5 per cent to a two-month low as weaker metal prices and monetary policy concerns in China soured sentiment.

The dollar's rise on US tax reform hopes has dented base metals which are denominated in the currency.

Copper prices recovered slightly in early London trading, up 0.1 per cent having hit a two-month low, but European mining stocks fell 1.1 per cent.

Geopolitical risks

Perceived geopolitical risks also loomed as US President Donald Trump was due to recognise Jerusalem as the capital of Israel later on Wednesday, a move the Palestinians' chief envoy to Great Britain said was “declaring war".

In euro zone debt markets, German 10-year government bond yields were close to three month lows on Wednesday as risk-off sentiment drove investors into safer assets.

The two-year Treasury yield fell slightly but still hovered near the nine-year high it's been driven to by the Fed's monetary tightening plans and hopes tax reform will boost the economy.

The 10-year Treasury yield also declined, helping the yield curve steepen slightly from its decade low. The flattening yield curve has obsessed investors concerned it may be a sign of imminent market stress.

“At the moment it is a market signal to watch and interpret, should the Fed start moving aggressively however it will become key to assessing the markets longer term economic view,” said Edward Park, investment director at Brooks Macdonald.

The dollar dipped slightly, weighed by lower long-term US yields. The dollar index against six major currencies slipped 0.05 per cent to 93.340.

Sterling slipped to $1.3402, down 0.3 as Prime Minister May came under pressure from opposition parties and EU diplomats after Brexit negotiations hit an impasse. The euro was little changed, up 0.03 percent at $1.1828 after shedding 0.35 per cent the previous day.

Bitcoin hits fresh record high

Bitcoin continued its dizzying ascent, hitting a fresh record high of $12,450.79 on the BitStamp exchange. The cryptocurrency is up more than 1,190 percent so far in 2017.

In commodities, U.S. crude oil futures were down 0.4 percent at $57.38 per barrel after American Petroleum Institute data showed that U.S. gasoline stocks and distillate inventories rose more than expected last week.

Brent crude lost 0.3 per cent to $62.66 per barrel. Emerging stocks hit a two-month low in early trading, having been bruised by rises in the dollar earlier this week.

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