LONDON (April 10): Equity funds have attracted more than half a trillion dollars in the past five months, exceeding inflows recorded over the previous 12 years, according to data from BofA, which has likened the stampede to a "melt-up" in markets.

The flows are also raising fears of a pullback from record highs, given valuations are at the highest since the dotcom bubble of the late 1990s, with the S&P 500 trading at nearly 22 times forward earnings.