CBOE Holdings Inc. posted the largest decrease in short interest relative to shares outstanding among SNL-covered financial services companies between Feb. 28 and March 15.

The percentage of the company's shares held short relative to shares outstanding declined 435 basis points to 2.88% as of March 15.

Altisource Portfolio Solutions SA topped the list of financial services companies with the largest increases in short interest in the first half of March. The company saw short interest rise 305 basis points to 31.76% of shares outstanding at the end of the period.

GATX Corp. was the most shorted financial services company between Feb. 28 and March 15. The company saw short interest climb 54 basis points to 32.96% of shares outstanding.