we need to find out who MERI is yes. on pinkies the size is not accurate but when you see shares that big it means they have a whole bunch to sell. usualy 5000 shares on pinky L2 means millions to sell. theres no telling how many shares a 15-20M size has.
on Nasdaq if a MM has 100 then they only have 100 to sell. it is accurate for bigboards.