The list of esoteric exchange-traded funds grew by three, with the addition of three ETFs from VTL Associates, The Wall Street Journal reports.

While the funds will track widely used indexes—the Tigers large-cap index, the S&P 400 and the S&P SmallCap 600—the advisor is tweaking its take on them by weighing holdings based on companies’ revenues. Skeptics wonder, however, if these funds will take off in a big way since there already are a number of ETFs based on weighted indexes.

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