No tears were shed in the marketplace when an embarrassed NatWest announced in mid-March that some of its interest rate options books had been mispriced over the last three years to the tune of £85 million.
A straw poll of options dealers and brokers suggests that NatWest’s mispricing had been an open secret. One US investment bank, having looked at NatWest’s prices and done its own sums, decided to call the bank’s bluff and bought, according to market sources, a large amount of out-of-the money options from NatWest.
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