Spark Energy Inc. posted the biggest jump in short interest relative to shares outstanding among SNL-covered power and gas companies between Dec. 30, 2016, and Jan. 13.
The company saw short interest rise 146 basis points to 33.17% of shares outstanding at the end of the period. The company also topped the list of most-shorted power and gas companies during the first half of January.
South Jersey Industries Inc. topped the list of power and gas companies with the biggest decreases in short interest in the first half of January. The percentage of the company's shares held short relative to shares outstanding dropped 103 basis points to 3.66% as of Jan. 13.
Peabody Energy Corp. was the most-shorted coal company during the period. The company saw short interest rise 326 basis points to 15.38% of shares outstanding.