SPY short sellers are at $68 Billion in size as of last week - the largest size since January 2016, according to WSJ citing S3 Partners, an analytics firm up from $41.7 billion at the beginning of 2020 and $41.2 billion a year ago https://www.wsj.com/articles/bets-against-the-stock-market-rise-to-highest-level-in-years-11587288601?mod=article_inline&adobe_mc=MCMID%3D34665667780576725229064433633526844435%7CMCORGID%3DCB68E4BA55144CAA0A4C98A5%2540AdobeOrg%7CTS%3D1587350953