Some profit taking and some covering by MMs MMs
Post# of 7807
MMs sold 309 million shares on Tuesday that they did not have.
Date........Symbol...Short Vol....... Total Vol
20210126|BIEL| 309121840 | 425134632
http://regsho.finra.org/FORFshvol20210126.txt
Their typical strategy when this occurs is to drop the SP so that they can cover the Shorting and make a profit.