Short squeeze yesterday, but it's not over yet - 41M shrs were short before yesterday, 16M covered, but 8M new shorts were minted (covers = total vol - short vol) - this is short activity only, as total trading volume was a whopping 52M:
Aggregate Short Volume Data Reported to FINRA
Date Short Volume Total Volume Short Percent
07-20-2018 8,657,047 26,124,034 33.14%
That still leaves 23.7M shares short, which is odd - haven't closed this high since Feb. 2017 - must not cost a lot to pay interest on those shorted shares - and they'll rue not covering IMO, don't think CLF is going back to the $6's or $7's.