LONDON (Reuters) - Alarm bells are ringing over valuations of the world’s leading technology stocks with worries over regulation causing many investors to cut exposure to the sector, Bank of America Merrill Lynch (BAML)’s April fund manager survey found.

FILE PHOTO: A 3D-printed Facebook logo is seen in front of displayed stock graph in this illustration photo, March 20, 2018. REUTERS/Dado Ruvic/File Photo

"Long FAANG + BAT" remains the top pick for "most crowded trade" for the third month running, BAML strategists said, referring to U.S. tech companies Facebook FB.O, Apple AAPL.O, Amazon AMZN.O, Netflix NFLX.O and Google GOOGL.O, and China's Baidu BIDU.O, Alibaba BABA.N and Tencent 0700.HK.

Since December last year, the “most-crowded” trades featured in the survey have reversed in a short space of time following the poll’s publication. These include long-Bitcoin (December) and short-volatility (January).

While survey participants still saw the tech stocks as popular, allocations to tech actually fell to their lowest since February 2013 on fears companies such as Facebook could face tighter regulation and higher barriers to trade.

Increasing anxiety about stock markets’ resilience led investors to reduce their positions on stocks generally, with bank stocks and Japan particularly targeted.

Allocation to equities fell to an 18-month low, while some 40 percent of investors surveyed expected the stock market to peak in the second half of this year.

Only 18 percent said the market had already peaked, however, while 39 percent said the peak wouldn’t come until next year. “Bulls silenced, not routed,” wrote BAML strategists.

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COMMODITIES, UK STOCKS IN DEMAND

Investors meanwhile reduced their bearish bets on bonds.

On average they said U.S. 10-year Treasury bond yields would have to reach 3.50 percent before they would rotate from equities back into bonds. The benchmark bonds were last yielding 2.8396 percent. US10YT=RR

In equities, fund managers ramped up their allocation to commodities to an eight-year high, and UK stocks to the highest since the Brexit vote in June 2016.

Shorting the U.S. dollar was seen as the second-most crowded trade, followed by buying corporate bonds. Hedge funds have been ramping up their short bets on the dollar to a total value of $27 billion.

After a ratcheting up of protectionist rhetoric between the U.S. and China, 38 percent of investors said they saw the threat of a trade war as the biggest risk, well ahead of concerns about central banks, market structure or inflation.

Average cash balances increased to 5 percent, ahead of the 10-year average of 4.5 percent. Strategists said a cash balance ahead of that average was a “buy” signal for equities.

Fund managers were pessimistic on the health of global corporates, however.

Expectations for global growth and profits were at 18-month lows, and only 8 percent of respondents thought earnings per share would rise in the next 12 months, down from 35 percent in February.

Doubts about indebtedness also increased: a record share of surveyed investors said companies are excessively levered.

In contrarian trades, government bonds, the U.S. dollar, and liquid defensives stocks such as pharmaceuticals or consumer staples were seen as the most unusual buys, while investors also saw shorting cyclical stocks and emerging market equities as going against the pack.