May 4 (Reuters) - U.S. refiner HollyFrontier Corp HFC.N
reported a 91 percent fall in quarterly profit hurt by a steep
fall in refining margins and lower refinery utilization rate.
The net profit attributable to the company's shareholders
fell to $21.3 million, or 12 cents per share, in the first
quarter ended March 31, from $226.9 million, or $1.16 per share,
a year earlier.
Sales and other revenue fell 33 percent to $2.02 billion.