Bears Pile Into Bitcoin Miners and SpaceX

Short sellers got busier last week. Data as of July 20 shows sharp moves in several names.

CleanSpark leads crypto miners with 32.3% of its free float sold short. That is barely unchanged week-on-week, but availability sits at just 23.7% of SI. Shares to borrow are running thin.

MARA Holdings is close behind at 29.9% SI. Availability has dropped to 15.1% — a sign borrow supply is drying up fast. Both names track Bitcoin closely and remain magnets for bearish bets.

SpaceX's listed vehicle SPCX saw short interest jump 3.6 percentage points in seven days to 29.7% of float. Availability is a razor-thin 8.5%. That combination — high SI, rising shorts, scarce borrow — raises squeeze risk.

The biggest weekly mover was Columbia Financial. SI climbed nearly 7 points to 24.2% of float. No obvious catalyst drove the move. Bears appear to be building quietly.

UAMY hit a notable milestone: utilization maxed at 100% with availability at zero. There are virtually no shares left to borrow.

Among social favourites, GME holds steady at 13.7% and TSLA sits at just 2.96% — both broadly flat for the week.