Holding big US tech stocks is again the hottest trade as investors return to equities on the back of upbeat earnings performance and improving global economic sentiment, according to Bank of America's monthly fund manager survey, which included 169 participants with $413 billion in assets under management. 45 per cent of those surveyed said the most crowded trade was "going long the seven tech giants" - a mix that includes big US tech stocks such as Nvidia and Microsoft...