if its so bad WHY did $BIIB buyback $750 million worth in 3rd quarter?

$WEN $ANF $MRK $UPS $IBKR $T $PFE $CKPT $FOXA $FOX $COIN $AAPL $AMZN $BA $EADSY $FB $RIDE $GEO $CLNE $INO $SCHW $VIRT $DISH $CPBI $UNFI $CMTL $SHW $BF.A  $xrp  $TRU $SWAP $DEGO $MKR $TRB $CVS $ENB https://t.co/2QEo83ICWw