wolfstreet.com/2019/10/17/...things-not-coming-together-here/
Of the total shares outstanding of the SPDR S&P 500 ETF, only 2.6% were out on loan to short sellers this week, the lowest since early October 2018, and down from 7% during the summer, according to IHS Markit data cited by Bloomberg. Meaning that short-sellers who want to short the entire market, and not specific companies, are worried that the market will break out, powered by a Brexit deal or a miraculous US-China trade deal as per presidential tweet, or whatever, and rip their faces off if they’re short the market.