The 185.69 million or so Sirius XM Holdings Inc. (NASDAQ: SIRI) shares short by the end of the month was more than 8% higher than on the previous settlement date and was the highest level of short interest in the past year. Some 10.4% of the company's float was sold short. At the current average daily volume, it would take four days to cover all short positions. Sirius reported record revenues late in the month. The share price ended the two-week period with a less than 2% gain, though it has down more than 1% at one point. The stock ended Tuesday at $3.98 a share, within a 52-week trading range of $3.29 to $4.20.