Sales jumped by 106 percent to $5.4 million in the second quarter ended Oct. 31 for Slinger, the company that started to deliver its innovative, portable Slinger Bag tennis ball launcher at the end of 2019. However, the company’s operating loss expanded to $35.1 million from a loss of $0.2 million in the year-ago period because of share-based compensation of $32.2 million. The announcement brought down the company’s share price on Nasdaq’s over-the-counter market to $1.72 per share, resulting in a stock market capitalization of $73.1 million. Slinger delayed a conference call with investors to finalize the technical accounting for a convertible bond.