Fund buyers are calling on iShares to review the pricing of its range of UK exchange-traded funds (ETFs), especially the mainstream vehicles that are charging substantially more than their peers.
The inability of US funds to outperform the S&P 500 has been a long-standing concern for fund selectors, but performance figures for the term of Barack Obama's presidency paint a particularly bleak picture.
Vanguard chief investment officer Gus Sauter will retire at the end of the year after a 25 year spell at the firm.
The early success of the active ETF version of Bill Gross' PIMCO Total Return fund does not yet herald a step change in the exchange-traded market, according to Vanguard's global head of ETFs.
Fund launches reached a decade low last year as groups held back new products in the face of market volatility.