Institutional ownership of APE vs. AMC

$AMC Entertainment (AMC.US)$ $AMC Preferred Equity Unit (APE.US)$
I know there were hundreds of institutions that didn't file, but I just want to remind you that isn't normal...

Yahoo Finance says 26.8% institutional ownership for AMC, 5.8% APE... and Blackrock and Vanguard must have sold theirs... because there's no data...

Add to it that Yahoo Finance says APE has a $4.337B market cap, which implies 3.8B APEs...